/**
 * @file RunSetup.tsx
 * @description The pre-run setup panel: everything the user picks before a run
 * exists. Moved verbatim out of `pages/Run.tsx` (where it was `ConfigCard`) so
 * the Run page and the Workspace page can both mount the same panel.
 *
 * What lives here:
 *   - `RunSetup` — fresh-vs-resume source, the prompt editor, and the cwd /
 *     model / effort fields, plus per-tool advanced fields (permission-mode for
 *     Claude; sandbox and approval for Codex), plus the concurrency hint and
 *     the Start button. Its disabled state is driven by the `binaryFound` prop
 *     for the lane's tool, so a missing binary is a surfaced state here rather
 *     than a probe of its own. Picking a session to resume starts that run
 *     immediately — a resume carries its own history, so there is nothing to
 *     type first; the prompt stays optional for resumes and required for fresh
 *     runs. Codex lanes show a "resume --last" button instead of the session
 *     picker (no sessions in the dashboard database to list).
 *   - the pickers the panel owns: `CwdAutocomplete`, `SessionPicker`,
 *     `ModelPicker`, and the small `Field` layout helper.
 *
 * Props only for `RunSetup`: no `/stage` call, no lane API call, and no run
 * lifecycle — the page owns `api.run.start` and hands the result back through
 * `onStart`. `SessionPicker` keeps the one API call it already owned (listing
 * past sessions to resume) and `PromptEditor` keeps its `@`-file lookup.
 *
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useMemo, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import {
  Play,
  RefreshCw,
  AlertCircle,
  ChevronDown,
  ShieldAlert,
  X,
  FolderOpen,
  GitBranch,
  Home,
  History as HistoryIcon,
  Search,
  RotateCcw,
  Lock,
} from "lucide-react";
import { api, RUN_MODEL_CHOICES, RUN_MODEL_CHOICES_CODEX, RUN_EFFORT_CHOICES } from "../../lib/api";
import type {
  CwdSuggestion,
  DashboardRunHistoryItem,
  RunListResponse,
  EffortLevel,
  PermissionMode,
  RunStartArgs,
  CodexSandbox,
  CodexApproval,
  CcMdItem,
} from "../../lib/api";
import type { Session, LaneTool } from "../../lib/types";
import { LANE_TOOL_LABEL } from "../../lib/types";
import { Select } from "../Select";

export interface SlashCommand {
  name: string;
  source: "project" | "user" | "builtin";
  description?: string;
}

// Commands the CLI answers itself. They are typed into the pane like any
// other text, so they do run — they are just not files anyone can list.
const BUILTIN_SLASH_COMMANDS: SlashCommand[] = [
  "help",
  "clear",
  "compact",
  "config",
  "model",
  "memory",
  "hooks",
  "cost",
  "agents",
  "review",
  "permissions",
  "status",
  "init",
  "mcp",
  "plugin",
  "output-style",
  "exit",
].map((name) => ({ name, source: "builtin" }));

const SOURCE_ORDER = { project: 0, user: 1, builtin: 2 } as const;
const SOURCE_TONE: Record<SlashCommand["source"], string> = {
  project: "text-status-success border-status-success/40",
  user: "text-accent border-accent/40",
  builtin: "text-fg-muted border-border",
};

/** Tiered match: exact > prefix > word prefix > substring > subsequence >
 *  description (3+ chars only, so one keystroke drags nothing tangential in). */
function scoreSlashMatch(name: string, description: string | undefined, q: string): number {
  if (!q) return 1;
  const n = name.toLowerCase();
  if (n === q) return 1000;
  if (n.startsWith(q)) return 800 - Math.min(n.length, 100);
  if (n.split(/[-_.:\s]/).some((p) => p.startsWith(q))) return 600 - Math.min(n.length, 100);
  const idx = n.indexOf(q);
  if (idx >= 0) return 400 - Math.min(idx, 100);
  let i = 0;
  for (let k = 0; k < n.length && i < q.length; k++) if (n[k] === q[i]) i++;
  if (i === q.length) return 200;
  if (q.length >= 3 && (description || "").toLowerCase().includes(q)) return 100;
  return 0;
}

interface Trigger {
  kind: "slash" | "file";
  query: string;
  /** Where the `/` or `@` token starts, so a pick replaces it up to the cursor. */
  start: number;
  cursor: number;
}

/** The `/…` or `@…` token the cursor is in, if any. A token starts at the
 *  line start or after whitespace, so `a/b` and `me@x.io` never trigger. */
function detectTrigger(value: string, cursor: number): Trigger | null {
  let start = cursor;
  while (start > 0 && !/\s/.test(value[start - 1] ?? " ")) start--;
  const tok = value.slice(start, cursor);
  if (tok.startsWith("/")) return { kind: "slash", query: tok.slice(1), start, cursor };
  if (tok.startsWith("@")) return { kind: "file", query: tok.slice(1), start, cursor };
  return null;
}

interface PromptEditorProps {
  value: string;
  onChange: (s: string) => void;
  onSubmit: () => void;
  placeholder: string;
  rows?: number;
  /** Offer slash commands. Off for codex: these are Claude Code's. */
  slash: boolean;
  /** Where `@` looks for files and project commands/skills are read from. */
  fileCwd: string;
}

function PromptEditor({
  value,
  onChange,
  onSubmit,
  placeholder,
  rows = 5,
  slash,
  fileCwd,
}: PromptEditorProps) {
  const { t } = useTranslation("run");
  const taRef = useRef<HTMLTextAreaElement | null>(null);
  const [trigger, setTrigger] = useState<Trigger | null>(null);
  const [active, setActive] = useState(0);
  const [files, setFiles] = useState<string[]>([]);
  const [commands, setCommands] = useState<SlashCommand[] | null>(null);
  const [commandsCwd, setCommandsCwd] = useState(fileCwd);
  if (commandsCwd !== fileCwd) {
    setCommandsCwd(fileCwd);
    setCommands(null);
  }
  const kind = trigger?.kind === "slash" && !slash ? null : trigger?.kind;

  // Commands and skills are read the first time `/` is typed for this cwd —
  // two directory walks nobody should pay for on every render of the form.
  useEffect(() => {
    if (kind !== "slash" || commands) return;
    let live = true;
    const toCmd = (c: CcMdItem): SlashCommand => ({
      name: c.name,
      source: c.scope,
      description: c.frontmatter?.description || c.preview.slice(0, 80),
    });
    Promise.all([
      api.ccConfig.commands(undefined, fileCwd).catch(() => ({ items: [] as CcMdItem[] })),
      api.ccConfig.skills(undefined, fileCwd).catch(() => ({ items: [] as CcMdItem[] })),
    ]).then(([c, sk]) => {
      if (live) setCommands([...c.items, ...sk.items].map(toCmd).concat(BUILTIN_SLASH_COMMANDS));
    });
    return () => {
      live = false;
    };
  }, [kind, commands, fileCwd]);

  // Files: debounced, and only the newest query may land.
  const query = trigger?.query ?? "";
  useEffect(() => {
    if (kind !== "file") return;
    let live = true;
    const tid = window.setTimeout(() => {
      api.run
        .files(fileCwd, query)
        .then((r) => live && setFiles(r.items))
        .catch(() => live && setFiles([]));
    }, 120);
    return () => {
      live = false;
      window.clearTimeout(tid);
    };
  }, [kind, query, fileCwd]);

  const slashItems = useMemo(() => {
    if (kind !== "slash" || !commands) return [];
    const q = query.toLowerCase();
    return commands
      .map((cmd) => ({ cmd, score: scoreSlashMatch(cmd.name, cmd.description, q) }))
      .filter((x) => x.score > 0)
      .sort(
        (a, b) =>
          b.score - a.score ||
          SOURCE_ORDER[a.cmd.source] - SOURCE_ORDER[b.cmd.source] ||
          a.cmd.name.localeCompare(b.cmd.name)
      )
      .map((x) => x.cmd);
  }, [kind, commands, query]);
  const count = kind === "file" ? files.length : slashItems.length;
  const current = Math.min(active, Math.max(0, count - 1));

  const pick = (token: string) => {
    if (!trigger) return;
    const before = value.slice(0, trigger.start);
    const after = value.slice(trigger.cursor);
    const sep = after.startsWith(" ") ? "" : " ";
    onChange(before + token + sep + after);
    setTrigger(null);
    setActive(0);
    const pos = before.length + token.length + 1;
    requestAnimationFrame(() => {
      taRef.current?.focus();
      taRef.current?.setSelectionRange(pos, pos);
    });
  };
  const pickAt = (i: number) => {
    if (kind === "file") {
      const f = files[i];
      if (f) pick(`@${f}`);
    } else {
      const c = slashItems[i];
      if (c) pick(`/${c.name}`);
    }
  };

  const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
    if (kind && count > 0) {
      if (e.key === "ArrowDown" || e.key === "ArrowUp") {
        e.preventDefault();
        const step = e.key === "ArrowDown" ? 1 : -1;
        setActive(Math.min(count - 1, Math.max(0, current + step)));
        return;
      }
      if ((e.key === "Enter" || e.key === "Tab") && !e.shiftKey && !e.nativeEvent.isComposing) {
        e.preventDefault();
        pickAt(current);
        return;
      }
    }
    if (kind && e.key === "Escape") {
      e.preventDefault();
      setTrigger(null);
      return;
    }
    // Enter sends (Ctrl/Cmd+Enter still does); Shift+Enter inserts a newline.
    // isComposing guards IME input (Vietnamese/CJK), where Enter commits the candidate.
    if (e.key === "Enter" && !e.shiftKey && !e.nativeEvent.isComposing) {
      e.preventDefault();
      onSubmit();
    }
  };

  const retrack = (ta: HTMLTextAreaElement) => {
    setTrigger(detectTrigger(ta.value, ta.selectionStart ?? 0));
  };

  const rowClass = (i: number) =>
    `w-full text-left px-3 py-1.5 transition-colors ${i === current ? "bg-accent/15" : "hover:bg-surface-3"}`;

  return (
    <div className="relative">
      <textarea
        ref={taRef}
        value={value}
        onChange={(e) => {
          onChange(e.target.value);
          retrack(e.target);
          setActive(0);
        }}
        onSelect={(e) => retrack(e.currentTarget)}
        onBlur={() => setTrigger(null)}
        onKeyDown={handleKeyDown}
        placeholder={placeholder}
        rows={rows}
        spellCheck={false}
        className="w-full bg-surface-2 border border-border rounded-md px-3 py-2 text-[11px] font-mono text-fg-primary placeholder:text-fg-muted focus:outline-none focus:border-accent/50 resize-none"
      />
      {kind && (
        <div
          role="listbox"
          data-testid="prompt-autocomplete"
          className="absolute z-30 left-0 right-0 top-full mt-1 max-h-72 overflow-auto rounded-md border border-border bg-surface-1 py-1 shadow-lg"
        >
          <div className="px-3 py-1.5 border-b border-border text-[10px] font-semibold uppercase tracking-wider text-fg-muted">
            {kind === "slash" ? t("autocomplete.slashHint") : t("autocomplete.fileHint")}
          </div>
          {count === 0 ? (
            <div className="px-3 py-2 text-[11px] text-fg-muted">
              {kind === "slash" && !commands ? "…" : t("autocomplete.noMatches")}
            </div>
          ) : kind === "slash" ? (
            slashItems.map((c, i) => (
              <button
                key={`${c.source}:${c.name}`}
                type="button"
                role="option"
                aria-selected={i === current}
                // Keep focus in the textarea, or its blur closes the list first.
                onMouseDown={(e) => e.preventDefault()}
                onClick={() => pickAt(i)}
                onMouseEnter={() => setActive(i)}
                className={rowClass(i)}
              >
                <div className="flex items-center gap-2">
                  <span className="font-mono text-[12px] text-fg-primary">/{c.name}</span>
                  <span
                    className={`rounded border px-1.5 py-0.5 font-mono text-[9px] ${SOURCE_TONE[c.source]}`}
                  >
                    {c.source}
                  </span>
                </div>
                {c.description && (
                  <div className="mt-0.5 truncate text-[10.5px] text-fg-muted">{c.description}</div>
                )}
              </button>
            ))
          ) : (
            files.map((f, i) => (
              <button
                key={f}
                type="button"
                role="option"
                aria-selected={i === current}
                onMouseDown={(e) => e.preventDefault()}
                onClick={() => pickAt(i)}
                onMouseEnter={() => setActive(i)}
                className={`${rowClass(i)} truncate font-mono text-[11px] text-fg-secondary`}
              >
                {f}
              </button>
            ))
          )}
        </div>
      )}
    </div>
  );
}

// ── Limitations banner (above the config card) ────────────────────────

interface RunSetupProps {
  laneId: number;
  prompt: string;
  onPromptChange: (s: string) => void;
  cwd: string;
  onCwdChange: (s: string) => void;
  cwdSuggestions: CwdSuggestion[];
  model: string;
  onModelChange: (s: string) => void;
  permissionMode: PermissionMode;
  onPermissionModeChange: (m: PermissionMode) => void;
  effort: EffortLevel;
  onEffortChange: (e: EffortLevel) => void;
  binaryFound: boolean;
  busy: boolean;
  onStart: (args: RunStartArgs) => void;
  activeRuns: RunListResponse | null;
  resumeSession: Session | null;
  onResumeSessionChange: (s: Session | null) => void;
  /** The selected lane's cwd - narrows the resume picker to that lane's own
   *  sessions. Undefined when no lane is selected (the picker then lists
   *  everything, same as before lanes existed). */
  laneCwd?: string;
  runHistory: DashboardRunHistoryItem[];
  onResumeFromHistory: (item: DashboardRunHistoryItem) => void;
  /** The selected lane's CLI. Decides which advanced fields render. */
  tool: LaneTool;
  sandbox: CodexSandbox;
  onSandboxChange: (s: CodexSandbox) => void;
  approval: CodexApproval;
  onApprovalChange: (a: CodexApproval) => void;
  /** Codex lanes resume with `--last`: the sessions table holds Claude
   *  sessions only, so there is nothing for the picker to list. */
  onResumeLast: () => void;
}

export function RunSetup(props: RunSetupProps) {
  const { t } = useTranslation("run");
  const atCap = false; // TODO: re-add when concurrency info is available
  const isResume = !!props.resumeSession;
  const [resumePicked, setResumePicked] = useState(isResume);
  // Keep "resume picked" in sync with the parent. Parent set a resume session
  // (e.g. user clicked Resume in the runs modal) - flip the radio so the picker
  // is shown and the selection is visible.
  useEffect(() => {
    if (isResume && !resumePicked) setResumePicked(true);
  }, [isResume, resumePicked]);

  return (
    <div className="rounded-xl border border-border bg-surface-1">
      {/* Run settings and the fresh-vs-resume source picker share one row:
          settings left, source right. They used to be two rows with a divider
          between them, which spent a band of height on four labelled selects
          that are each one line tall. The resume picker below is the only part
          that still gets a row of its own, and only while resume is chosen. */}
      <div className="flex flex-wrap items-end gap-3 border-b border-border px-4 py-3">
        <div className="grid min-w-0 flex-1 grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-4">
          <Field label={t("fields.cwd")}>
            {isResume && props.resumeSession ? (
              <div className="bg-surface-2 border border-border rounded-md px-3 py-1.5 text-[11px] font-mono text-fg-secondary flex items-center gap-2">
                <Lock className="w-3 h-3 text-fg-muted flex-shrink-0" />
                <span className="truncate">{props.resumeSession.cwd}</span>
              </div>
            ) : (
              <div title={t("fields.cwdHint")}>
                <CwdAutocomplete
                  value={props.cwd}
                  onChange={props.onCwdChange}
                  suggestions={props.cwdSuggestions}
                />
              </div>
            )}
          </Field>
          {/* `agy` takes no model, permission or effort flag. */}
          {props.tool !== "antigravity" && (
            <Field label={t("fields.model")}>
              <ModelPicker value={props.model} onChange={props.onModelChange} tool={props.tool} />
            </Field>
          )}
          {props.tool === "antigravity" ? null : props.tool === "codex" ? (
            <>
              <Field label={t("fields.sandbox")}>
                <Select<CodexSandbox>
                  value={props.sandbox}
                  onChange={props.onSandboxChange}
                  options={[
                    { value: "read-only", label: t("fields.sandboxReadOnly") },
                    { value: "workspace-write", label: t("fields.sandboxWorkspaceWrite") },
                    { value: "danger-full-access", label: t("fields.sandboxFullAccess") },
                  ]}
                />
              </Field>
              <Field label={t("fields.approval")}>
                <Select<CodexApproval>
                  value={props.approval}
                  onChange={props.onApprovalChange}
                  options={[
                    { value: "on-request", label: t("fields.approvalOnRequest") },
                    { value: "never", label: t("fields.approvalNever") },
                  ]}
                />
              </Field>
            </>
          ) : (
            <Field label={t("fields.permissionMode")}>
              <Select<PermissionMode>
                value={props.permissionMode}
                onChange={props.onPermissionModeChange}
                options={[
                  { value: "auto", label: t("fields.permissionAuto") },
                  { value: "acceptEdits", label: t("fields.permissionAcceptEdits") },
                  { value: "default", label: t("fields.permissionDefault") },
                  { value: "plan", label: t("fields.permissionPlan") },
                  { value: "bypassPermissions", label: t("fields.permissionBypass") },
                ]}
              />
            </Field>
          )}
          {props.tool !== "antigravity" && (
            <Field label={t("fields.effort")}>
              <Select<EffortLevel>
                value={props.effort}
                onChange={props.onEffortChange}
                options={RUN_EFFORT_CHOICES.map((c) => ({
                  value: c.id,
                  label: c.label,
                  hint: c.hint,
                }))}
              />
            </Field>
          )}
        </div>
        <div className="flex shrink-0 items-center rounded-md border border-border bg-surface-2 p-0.5 text-[11.5px]">
          <Seg
            active={!resumePicked}
            label={t("resume.freshOption")}
            title={t("resume.freshHint")}
            onClick={() => {
              setResumePicked(false);
              props.onResumeSessionChange(null);
            }}
          />
          <Seg
            active={resumePicked}
            label={t("resume.resumeOption")}
            title={t("resume.resumeHint")}
            onClick={() => setResumePicked(true)}
          />
        </div>
      </div>

      {resumePicked && (
        <div className="border-b border-border px-4 py-2 text-[11.5px]">
          <div className="min-w-0">
            {props.tool === "claude" ? (
              <SessionPicker
                selected={props.resumeSession}
                onSelect={(s) => {
                  props.onResumeSessionChange(s);
                  // Pass the picked session explicitly: the parent's state
                  // update has not landed yet on this tick, so reading
                  // props.resumeSession here would resume nothing.
                  if (s && !props.busy) handleStart(props, s);
                }}
                // Fall back to the typed cwd when no lane is selected — otherwise
                // an unfiltered picker lists every session from every repo.
                cwd={props.laneCwd || props.cwd.trim() || undefined}
              />
            ) : (
              <button
                onClick={() => props.onResumeLast()}
                disabled={props.busy}
                className="px-3 py-1.5 text-[11px] rounded-md bg-surface-2 border border-border hover:border-accent/50 text-fg-primary hover:text-accent transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
              >
                {t("resume.lastOption")}
              </button>
            )}
          </div>
        </div>
      )}

      {/* Prompt */}
      <div className="px-4 py-3 border-b border-border">
        <label className="block text-[11px] font-semibold uppercase tracking-wider text-fg-muted mb-1.5">
          {t("fields.prompt")}
        </label>
        <PromptEditor
          value={props.prompt}
          onChange={props.onPromptChange}
          onSubmit={() => handleStart(props)}
          placeholder={t("fields.promptPlaceholderTerminal", { tool: LANE_TOOL_LABEL[props.tool] })}
          rows={5}
          slash={props.tool === "claude"}
          fileCwd={props.resumeSession?.cwd || props.cwd}
        />
        <div className="mt-1 text-[10px] text-fg-muted">
          {t("hint.shortcut")} · / for slash commands · @ for file references
        </div>
      </div>

      {props.tool === "codex" && props.sandbox === "danger-full-access" && (
        <div className="mx-4 mb-3 rounded-md border border-status-danger/40 bg-status-danger/10 px-3 py-2 text-[11px] text-status-danger flex items-start gap-2">
          <ShieldAlert className="w-3.5 h-3.5 flex-shrink-0 mt-0.5" />
          <span>{t("hint.sandboxWarning")}</span>
        </div>
      )}

      {props.tool === "claude" && props.permissionMode === "bypassPermissions" && (
        <div className="mx-4 mb-3 rounded-md border border-status-danger/40 bg-status-danger/10 px-3 py-2 text-[11px] text-status-danger flex items-start gap-2">
          <ShieldAlert className="w-3.5 h-3.5 flex-shrink-0 mt-0.5" />
          <span>{t("hint.permissionWarning")}</span>
        </div>
      )}

      {/* Footer: contextual run-state hint + run button */}
      <div className="border-t border-border px-4 py-3 flex items-center justify-between gap-3 flex-wrap">
        <div className="flex items-center gap-3 text-[11px] min-w-0">
          {atCap ? (
            <span className="inline-flex items-center gap-1.5 text-status-warning">
              <AlertCircle className="w-3.5 h-3.5" />
              {t("concurrency.atCap", { max: 0 })}
            </span>
          ) : null}
        </div>
        <button
          onClick={() => handleStart(props)}
          disabled={
            !props.binaryFound ||
            // A resume needs no prompt — the session it continues is the input.
            (!props.resumeSession && !props.prompt.trim()) ||
            props.busy ||
            atCap ||
            (resumePicked && !props.resumeSession) ||
            // Resume locks cwd to the original session, so allow it then;
            // otherwise require a non-empty cwd so we never spawn at an
            // invisible default.
            (!props.resumeSession && !props.cwd.trim())
          }
          className="inline-flex items-center gap-2 rounded-lg border border-accent/40 bg-accent/15 hover:bg-accent/25 text-accent px-4 py-1.5 text-sm font-medium transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
        >
          {props.busy ? (
            <RefreshCw className="w-3.5 h-3.5 animate-spin" />
          ) : (
            <Play className="w-3.5 h-3.5" />
          )}
          {props.busy ? t("actions.starting") : t("actions.start")}
        </button>
      </div>
    </div>
  );
}

/** `session` overrides `props.resumeSession` for the auto-start fired straight
 *  out of the picker, before the parent's state has caught up. */
function handleStart(props: RunSetupProps, session?: Session) {
  const resume = session ?? props.resumeSession;
  const codex = props.tool === "codex";
  const agy = props.tool === "antigravity";
  props.onStart({
    laneId: props.laneId,
    // A resume is pinned to its own session's folder — that's what the locked
    // cwd field shows, so it's what gets sent.
    cwd: resume?.cwd || props.cwd || undefined,
    model: agy ? undefined : props.model || undefined,
    permissionMode: codex || agy ? undefined : props.permissionMode || undefined,
    sandbox: codex ? props.sandbox : undefined,
    approval: codex ? props.approval : undefined,
    effort: agy ? undefined : props.effort || undefined,
    resumeSessionId: codex || agy ? undefined : resume?.id || undefined,
    // A resume continues a session that already has its own history — sending
    // whatever is sitting in the prompt box would fire an extra turn nobody
    // asked for, so a resume carries no prompt at all.
    initialPrompt: resume ? undefined : props.prompt || undefined,
  });
}

/** One segment of a two-way inline choice. The explanation rides on `title`
 *  instead of a hint line, which is what keeps the row to one line. */
function Seg({
  active,
  label,
  title,
  onClick,
}: {
  active: boolean;
  label: string;
  title?: string;
  onClick: () => void;
}) {
  return (
    <button
      type="button"
      onClick={onClick}
      title={title}
      aria-pressed={active}
      className={`rounded px-2 py-0.5 font-medium transition-colors ${
        active ? "bg-accent/20 text-accent" : "text-fg-secondary hover:text-fg-primary"
      }`}
    >
      {label}
    </button>
  );
}

function Field({ label, children }: { label: string; children: React.ReactNode }) {
  return (
    <div>
      <label className="block text-[10px] font-semibold uppercase tracking-wider text-fg-muted mb-1">
        {label}
      </label>
      {children}
    </div>
  );
}

// ── CWD autocomplete ──────────────────────────────────────────────────

export function CwdAutocomplete({
  value,
  onChange,
  suggestions,
  inputId,
}: {
  value: string;
  onChange: (s: string) => void;
  suggestions: CwdSuggestion[];
  /** Sets the input's `id` so an external `<label htmlFor>` can target it. */
  inputId?: string;
}) {
  const { t } = useTranslation("run");
  const [open, setOpen] = useState(false);
  const [active, setActive] = useState(0);
  const containerRef = useRef<HTMLDivElement | null>(null);
  const inputRef = useRef<HTMLInputElement | null>(null);

  // Close dropdown on outside click
  useEffect(() => {
    if (!open) return;
    const onClick = (e: MouseEvent) => {
      if (!containerRef.current) return;
      if (!containerRef.current.contains(e.target as Node)) setOpen(false);
    };
    document.addEventListener("mousedown", onClick);
    return () => document.removeEventListener("mousedown", onClick);
  }, [open]);

  const filtered = useMemo(() => {
    const q = value.toLowerCase().trim();
    const out = suggestions.filter(
      (s) => !q || s.path.toLowerCase().includes(q) || s.label.toLowerCase().includes(q)
    );
    return out;
  }, [value, suggestions]);

  // Group suggestions by kind preserving fixed order — home first, matching
  // the neutral default the page pre-fills (issue #202).
  const groups = useMemo(() => {
    // "repo" (source repos lanes were cut from) sits above the recents: on the
    // Add-lane form it is the group the field is actually asking for, and on
    // the Run form it is a short, deliberate list rather than history.
    const order: CwdSuggestion["kind"][] = ["home", "dashboard", "repo", "recent"];
    return order
      .map((kind) => ({ kind, items: filtered.filter((s) => s.kind === kind) }))
      .filter((g) => g.items.length > 0);
  }, [filtered]);

  // Flat index for keyboard navigation
  const flat = useMemo(() => groups.flatMap((g) => g.items), [groups]);

  // Keep `active` clamped within bounds
  useEffect(() => {
    if (active >= flat.length) setActive(Math.max(0, flat.length - 1));
  }, [flat.length, active]);

  const choose = (s: CwdSuggestion) => {
    onChange(s.path);
    setOpen(false);
    inputRef.current?.blur();
  };

  const onKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
    if (!open && (e.key === "ArrowDown" || e.key === "ArrowUp")) {
      setOpen(true);
      e.preventDefault();
      return;
    }
    if (e.key === "ArrowDown") {
      e.preventDefault();
      setActive((a) => Math.min(flat.length - 1, a + 1));
    } else if (e.key === "ArrowUp") {
      e.preventDefault();
      setActive((a) => Math.max(0, a - 1));
    } else if (e.key === "Enter") {
      if (open && flat[active]) {
        e.preventDefault();
        choose(flat[active]);
      }
    } else if (e.key === "Escape") {
      setOpen(false);
    }
  };

  return (
    <div ref={containerRef} className="relative">
      <div className="relative">
        <FolderOpen className="absolute left-2 top-1/2 -translate-y-1/2 w-3.5 h-3.5 text-fg-muted pointer-events-none" />
        <input
          ref={inputRef}
          id={inputId}
          type="text"
          value={value}
          onChange={(e) => {
            onChange(e.target.value);
            setOpen(true);
            setActive(0);
          }}
          onFocus={() => setOpen(true)}
          onKeyDown={onKeyDown}
          placeholder={t("fields.cwdPlaceholder")}
          autoComplete="off"
          spellCheck={false}
          className="w-full bg-surface-2 border border-border rounded-md pl-7 pr-3 py-1.5 text-[11px] font-mono text-fg-primary placeholder:text-fg-muted focus:outline-none focus:border-accent/50"
        />
      </div>
      {open && (
        <div className="absolute z-30 left-0 right-0 mt-1 rounded-md border border-border bg-surface-1 shadow-lg shadow-black/40 max-h-72 overflow-auto py-1">
          {groups.length === 0 ? (
            <div className="px-3 py-2 text-[11px] text-fg-muted">{t("fields.cwdNoMatches")}</div>
          ) : (
            groups.map((g) => (
              <div key={g.kind}>
                <div className="px-3 pt-1.5 pb-0.5 text-[10px] font-semibold uppercase tracking-wider text-fg-muted flex items-center gap-1.5">
                  {g.kind === "dashboard" ? (
                    <FolderOpen className="w-3 h-3" />
                  ) : g.kind === "home" ? (
                    <Home className="w-3 h-3" />
                  ) : g.kind === "repo" ? (
                    <GitBranch className="w-3 h-3" />
                  ) : (
                    <HistoryIcon className="w-3 h-3" />
                  )}
                  {t(`fields.cwdGroups.${g.kind}`)}
                </div>
                {g.items.map((s) => {
                  const idx = flat.indexOf(s);
                  const isActive = idx === active;
                  return (
                    <button
                      key={s.path}
                      type="button"
                      onMouseDown={(e) => e.preventDefault() /* keep input focused */}
                      onClick={() => choose(s)}
                      onMouseEnter={() => setActive(idx)}
                      className={`w-full text-left px-3 py-1.5 transition-colors ${
                        isActive ? "bg-accent/15" : "hover:bg-surface-3"
                      }`}
                    >
                      <div className="text-[11px] text-fg-secondary truncate">{s.label}</div>
                      <div className="font-mono text-[10px] text-fg-muted truncate">{s.path}</div>
                    </button>
                  );
                })}
              </div>
            ))
          )}
        </div>
      )}
    </div>
  );
}

// ── Model picker ──────────────────────────────────────────────────────

// ── Session picker (for resume) ───────────────────────────────────────

function SessionPicker({
  selected,
  onSelect,
  cwd,
}: {
  selected: Session | null;
  onSelect: (s: Session | null) => void;
  /** Restricts the list to sessions under this exact working directory - the
   *  lane a resume is started from should only offer that lane's own history. */
  cwd?: string;
}) {
  const { t } = useTranslation("run");
  const [open, setOpen] = useState(false);
  const [query, setQuery] = useState("");
  const [sessions, setSessions] = useState<Session[] | null>(null);
  const containerRef = useRef<HTMLDivElement | null>(null);

  // Lazily load sessions when the picker opens, and again whenever the lane
  // (and so its cwd filter) changes - otherwise switching lanes would leave
  // the picker showing the PREVIOUS lane's sessions until closed and reopened.
  const fetchedForCwd = useRef<string | undefined>(undefined);
  useEffect(() => {
    if (!open) return;
    if (sessions !== null && fetchedForCwd.current === cwd) return;
    fetchedForCwd.current = cwd;
    api.sessions
      .list({ sort_by: "started_at", sort_desc: true, limit: 100, cwd })
      .then((r) => setSessions(r.sessions))
      .catch(() => setSessions([]));
  }, [open, cwd, sessions]);

  useEffect(() => {
    if (!open) return;
    const onClick = (e: MouseEvent) => {
      if (!containerRef.current) return;
      if (!containerRef.current.contains(e.target as Node)) setOpen(false);
    };
    document.addEventListener("mousedown", onClick);
    return () => document.removeEventListener("mousedown", onClick);
  }, [open]);

  const filtered = useMemo(() => {
    if (!sessions) return [];
    const q = query.toLowerCase().trim();
    if (!q) return sessions;
    return sessions.filter(
      (s) =>
        s.id.toLowerCase().includes(q) ||
        (s.cwd || "").toLowerCase().includes(q) ||
        (s.status || "").toLowerCase().includes(q)
    );
  }, [sessions, query]);

  if (selected) {
    return (
      <div className="mt-2 rounded-lg border border-accent/30 bg-accent/5 px-3 py-2 flex items-start gap-2">
        <RotateCcw className="w-3.5 h-3.5 text-accent flex-shrink-0 mt-0.5" />
        <div className="min-w-0 flex-1">
          <div className="flex items-center gap-2 flex-wrap">
            <span className="text-[10px] font-mono px-1.5 py-0.5 rounded bg-accent/15 text-accent border border-accent/30">
              {t("resume.selectedBadge")}
            </span>
            <span className="font-mono text-[11px] text-fg-secondary truncate">{selected.id}</span>
          </div>
          <div className="font-mono text-[10px] text-fg-muted truncate mt-0.5">{selected.cwd}</div>
        </div>
        <button
          onClick={() => onSelect(null)}
          className="text-[10px] font-medium px-2 py-0.5 rounded border border-border bg-surface-2 hover:bg-surface-3 text-fg-secondary inline-flex items-center gap-1 flex-shrink-0"
        >
          <X className="w-3 h-3" />
          {t("resume.clear")}
        </button>
      </div>
    );
  }

  return (
    <div ref={containerRef} className="relative mt-2">
      <button
        onClick={() => setOpen((v) => !v)}
        className="w-full text-left rounded-md border border-dashed border-border bg-surface-2 hover:bg-surface-3 px-3 py-2 text-[11px] text-fg-secondary inline-flex items-center gap-2"
      >
        <RotateCcw className="w-3.5 h-3.5" />
        {t("resume.pickSession")}
        <ChevronDown className="w-3 h-3 opacity-70 ml-auto" />
      </button>
      {open && (
        <div className="absolute z-30 left-0 right-0 mt-1 rounded-md border border-border bg-surface-1 shadow-lg shadow-black/40 overflow-hidden">
          <div className="px-3 py-2 border-b border-border flex items-center gap-2">
            <Search className="w-3.5 h-3.5 text-fg-muted flex-shrink-0" />
            <input
              autoFocus
              value={query}
              onChange={(e) => setQuery(e.target.value)}
              placeholder={t("resume.search")}
              className="bg-transparent text-[11px] text-fg-primary placeholder:text-fg-muted focus:outline-none w-full"
            />
          </div>
          <div className="max-h-72 overflow-auto py-1">
            {sessions === null ? (
              <div className="px-3 py-2 text-[11px] text-fg-muted">…</div>
            ) : filtered.length === 0 ? (
              <div className="px-3 py-2 text-[11px] text-fg-muted">{t("resume.noSessions")}</div>
            ) : (
              filtered.map((s) => (
                <button
                  key={s.id}
                  onClick={() => {
                    onSelect(s);
                    setOpen(false);
                    setQuery("");
                  }}
                  className="w-full text-left px-3 py-2 hover:bg-surface-3 transition-colors"
                >
                  <div className="flex items-center gap-2 mb-0.5">
                    <span
                      className={`text-[10px] font-mono px-1.5 py-0.5 rounded border ${
                        s.status === "active"
                          ? "bg-status-success/10 text-status-success border-status-success/30"
                          : s.status === "completed"
                            ? "bg-sky-500/10 text-sky-700 dark:text-sky-300 border-sky-500/30"
                            : s.status === "error"
                              ? "bg-status-danger/10 text-status-danger border-status-danger/30"
                              : "bg-surface-3 text-fg-secondary border-border"
                      }`}
                    >
                      {s.status}
                    </span>
                    {s.name?.trim() && (
                      <span className="text-[11px] text-fg-secondary truncate">
                        {s.name.trim()}
                      </span>
                    )}
                    <span className="font-mono text-[11px] text-fg-secondary truncate flex-shrink-0">
                      {s.id.slice(0, 12)}…
                    </span>
                    <span className="text-[10px] text-fg-muted ml-auto flex-shrink-0">
                      {new Date(s.started_at).toLocaleString()}
                    </span>
                  </div>
                  <div className="font-mono text-[10px] text-fg-muted truncate">{s.cwd}</div>
                </button>
              ))
            )}
          </div>
        </div>
      )}
    </div>
  );
}

// The custom Select dropdown now lives in ../components/Select (shared with the
// webhook settings form). Imported at the top of this file.

// Sentinel option value for "Custom model…". Empty string is already taken by
// the "inherit from settings" choice, so use a non-empty marker.
const MODEL_CUSTOM = "__custom__";

function ModelPicker({
  value,
  onChange,
  tool,
}: {
  value: string;
  onChange: (s: string) => void;
  tool: LaneTool;
}) {
  const { t } = useTranslation("run");
  const choices = tool === "codex" ? RUN_MODEL_CHOICES_CODEX : RUN_MODEL_CHOICES;
  // "Custom" is selected when the value isn't one of our curated IDs.
  const knownIds = useMemo(() => choices.map((c) => c.id), [choices]);
  const isCustom = value !== "" && !knownIds.includes(value);
  const [showCustom, setShowCustom] = useState(isCustom);

  // Reuse the shared Select so the Model dropdown renders identically to the
  // Permission Mode and Effort dropdowns (Tailwind + lucide popover) instead of
  // a browser-native <select>.
  const options = useMemo(
    () => [
      ...choices.map((c) => ({
        value: c.id === "" ? "" : c.id,
        label: c.id === "" ? t("fields.modelInheritLabel") : c.label,
        hint: c.hint,
      })),
      { value: MODEL_CUSTOM, label: t("fields.modelCustom") },
    ],
    [t, choices]
  );

  const onSelect = (v: string) => {
    if (v === MODEL_CUSTOM) {
      setShowCustom(true);
      return;
    }
    setShowCustom(false);
    onChange(v);
  };

  const selectValue = showCustom || isCustom ? MODEL_CUSTOM : value;

  return (
    <div className="space-y-1.5">
      <Select<string> value={selectValue} onChange={onSelect} options={options} />
      {(showCustom || isCustom) && (
        <input
          type="text"
          value={value}
          onChange={(e) => onChange(e.target.value)}
          placeholder={t("fields.modelCustomPlaceholder")}
          autoComplete="off"
          spellCheck={false}
          className="w-full bg-surface-2 border border-border rounded-md px-3 py-1.5 text-[11px] font-mono text-fg-primary placeholder:text-fg-muted focus:outline-none focus:border-accent/50"
        />
      )}
    </div>
  );
}