/**
 * @file AiToolsSettings.tsx
 * @description Settings → Agents → AI tools (`/settings/agents`): every AI coding CLI in the server's catalog
 * (GET /api/ai-tools). Installed ones are rows with an enable switch, a
 * Default badge or Set default, and Update whenever the catalog names an
 * updater — no version lookup, the updater itself knows whether it has work.
 * The ones available to install fold behind a disclosure, with Install where
 * the catalog knows how. Install/Update/Update all confirm the exact command
 * first, run as ONE server job at a time and show its log under the row
 * (polled from GET /api/ai-tools/job; a finished job folds to one line).
 * A right-click on an installed row opens its Update / Set default /
 * Enable-Disable (plus Copy path) as a menu; the buttons stay.
 * Refresh re-reads the login shell's PATH and re-detects. Icons come from
 * `AiToolIcon`. A disabled tool is hidden from Add lane; existing lanes keep
 * working.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { Switch } from "../Switch";
import { useEffect, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import { ChevronDown, Download, ExternalLink, RefreshCw } from "lucide-react";
import { useAiTools } from "../../hooks/useAiTools";
import { ConfirmModal } from "../ConfirmModal";
import { AiToolIcon } from "../AiToolIcon";
import { ContextMenu, MenuItem, MenuSeparator, useContextMenu } from "../ContextMenu";
import { api, type AiTool, type AiToolJob } from "../../lib/api";

type Confirm = { kind: "install" | "update"; tool: AiTool } | { kind: "update-all" };

const GHOST_BTN =
  "inline-flex items-center gap-1.5 rounded-md border border-border px-2 py-1 text-xs text-fg-secondary hover:bg-surface-3 hover:text-fg-primary disabled:opacity-50";

function Homepage({ tool }: { tool: AiTool }) {
  const { t } = useTranslation("settings");
  if (!tool.homepageUrl) return null;
  return (
    <a
      href={tool.homepageUrl}
      target="_blank"
      rel="noreferrer noopener"
      title={t("aiTools.homepage")}
      aria-label={t("aiTools.homepageOf", { tool: tool.label })}
      className="text-fg-muted hover:text-accent"
    >
      <ExternalLink className="w-3.5 h-3.5" />
    </a>
  );
}

function ToolSwitch({
  tool,
  disabled,
  onToggle,
}: {
  tool: AiTool;
  disabled: boolean;
  onToggle: () => void;
}) {
  const { t } = useTranslation("settings");
  return (
    <Switch
      checked={tool.enabled}
      onChange={onToggle}
      label={t("aiTools.enabledOf", { tool: tool.label })}
      title={tool.enabled ? t("aiTools.enabled") : t("aiTools.disabled")}
      disabled={disabled}
    />
  );
}

function JobLog({ job }: { job: AiToolJob }) {
  const { t } = useTranslation("settings");
  const ref = useRef<HTMLPreElement | null>(null);
  // A finished job folds to its status line; running or failed stays open.
  const [open, setOpen] = useState(job.status !== "ok");
  useEffect(() => {
    if (job.status === "ok") setOpen(false);
  }, [job.status]);
  useEffect(() => {
    if (ref.current) ref.current.scrollTop = ref.current.scrollHeight;
  }, [job.log, open]);
  const state =
    job.status === "running"
      ? t("aiTools.jobRunning")
      : job.status === "ok"
        ? t("aiTools.jobOk")
        : t("aiTools.jobFailed", { code: job.exitCode ?? "?" });
  return (
    <div className="mt-2 w-full">
      <div className="flex items-center gap-2 text-[11px]">
        <span className={job.status === "failed" ? "text-status-danger" : "text-fg-muted"}>
          {state}
        </span>
        {job.status !== "running" && (
          <button
            type="button"
            onClick={() => setOpen((o) => !o)}
            className="text-fg-muted underline-offset-2 hover:text-fg-primary hover:underline"
          >
            {open ? t("aiTools.hideLog") : t("aiTools.showLog")}
          </button>
        )}
      </div>
      {open && (
        <pre
          ref={ref}
          data-testid="ai-tool-log"
          className="mt-1 max-h-48 overflow-auto whitespace-pre-wrap rounded-md border border-border bg-surface-0 p-2 font-mono text-[11px] text-fg-secondary"
        >
          {job.log}
        </pre>
      )}
    </div>
  );
}

export function AiToolsSettings() {
  const { t } = useTranslation("settings");
  const { tools, loaded, defaultId, refresh, update, reload } = useAiTools();
  const [busy, setBusy] = useState<string | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [job, setJob] = useState<AiToolJob | null>(null);
  const [confirm, setConfirm] = useState<Confirm | null>(null);
  const [showAvailable, setShowAvailable] = useState(false);
  const ctx = useContextMenu<AiTool>();
  // A menu item: close the menu, then act on the tool it was opened on.
  const pick = (fn: (tool: AiTool) => unknown) => () => {
    const tool = ctx.menu?.item;
    ctx.close();
    if (tool) fn(tool);
  };
  const setDefault = (tool: AiTool) => void run(tool.id, () => update(tool.id, { default: true }));
  const toggle = (tool: AiTool) =>
    void run(tool.id, () => update(tool.id, { enabled: !tool.enabled }));

  // A modal opened mid-job picks it up. Deferred like useAiTools' load: an
  // unreachable server (or a mocked api without it) means "no job".
  useEffect(() => {
    Promise.resolve()
      .then(() => api.aiTools.job())
      .then(setJob)
      .catch(() => undefined);
  }, []);

  const running = job?.status === "running";
  useEffect(() => {
    if (!running) return;
    const h = window.setInterval(async () => {
      try {
        const j = await api.aiTools.job();
        setJob(j);
        if (j?.status !== "running") void reload();
      } catch {
        /* next tick */
      }
    }, 1000);
    return () => window.clearInterval(h);
  }, [running, reload]);

  const run = async (key: string, fn: () => Promise<void>) => {
    setBusy(key);
    setError(null);
    try {
      await fn();
    } catch (err) {
      setError(err instanceof Error ? err.message : String(err));
    } finally {
      setBusy(null);
    }
  };

  const npmCmd = (pkg: string) => `npm install -g ${pkg}@latest`;
  const commandFor = (tool: AiTool, action: "install" | "update"): string => {
    const inst = tool.install;
    if (action === "update" && tool.update?.kind === "self") {
      return [tool.command ?? tool.id, ...tool.update.args].join(" ");
    }
    if (inst?.kind === "npm") return npmCmd(inst.package);
    if (inst?.kind === "script") return t("aiTools.runScript", { url: inst.url });
    return "";
  };
  const installed = tools.filter((x) => x.installed);
  const available = tools.filter((x) => !x.installed);
  // Mirrors the server's update-all: every installed tool with an updater.
  const updateAllTools = installed.filter((x) => x.update);

  const startConfirmed = async () => {
    const c = confirm;
    setConfirm(null);
    if (!c) return;
    await run("job", async () => {
      const r =
        c.kind === "install"
          ? await api.aiTools.install(c.tool.id)
          : c.kind === "update"
            ? await api.aiTools.updateTool(c.tool.id)
            : await api.aiTools.updateAll();
      setJob(r.job);
    });
  };

  const jobBusy = running || busy !== null;
  const logFor = (id: string | null) => (job && job.tool === id ? <JobLog job={job} /> : null);

  const confirmLines =
    confirm?.kind === "update-all"
      ? updateAllTools.map((x) => commandFor(x, "update"))
      : confirm
        ? [commandFor(confirm.tool, confirm.kind)]
        : [];

  return (
    <div className="space-y-5">
      <div>
        <div className="mb-2 flex items-center justify-between gap-3">
          <p className="text-xs font-medium text-fg-secondary">
            {t("aiTools.installed", { count: installed.length })}
          </p>
          <div className="flex items-center gap-2">
            {updateAllTools.length > 0 && (
              <button
                type="button"
                onClick={() => setConfirm({ kind: "update-all" })}
                disabled={jobBusy}
                className={GHOST_BTN}
              >
                <Download className="w-3.5 h-3.5" />
                {t("aiTools.updateAll", { count: updateAllTools.length })}
              </button>
            )}
            <button
              type="button"
              onClick={() => void run("refresh", refresh)}
              disabled={busy !== null}
              className={GHOST_BTN}
            >
              <RefreshCw className={`w-3.5 h-3.5 ${busy === "refresh" ? "animate-spin" : ""}`} />
              {t("aiTools.refresh")}
            </button>
          </div>
        </div>
        {error && <p className="mb-2 text-xs text-status-danger">{error}</p>}
        {logFor(null)}
        {loaded && installed.length === 0 && (
          <p className="text-xs text-fg-muted">{t("aiTools.noneInstalled")}</p>
        )}
        <ul className="divide-y divide-border overflow-hidden rounded-lg border border-border bg-surface-2">
          {installed.map((tool) => {
            const isDefault = tool.id === defaultId;
            return (
              <li
                key={tool.id}
                data-testid={`ai-tool-${tool.id}`}
                onContextMenu={(e) => ctx.open(e, tool)}
                className="px-3 py-2.5"
              >
                <div className="flex items-center gap-3">
                  <div
                    className={`flex min-w-0 flex-1 items-center gap-3 ${tool.enabled ? "" : "opacity-50"}`}
                  >
                    <AiToolIcon tool={tool} />
                    <div className="min-w-0">
                      <div className="flex items-center gap-1.5 text-sm font-medium text-fg-primary">
                        <span className="truncate">{tool.label}</span>
                        <Homepage tool={tool} />
                        {isDefault && (
                          <span className="rounded-full bg-accent/15 px-2 py-0.5 text-[10px] font-medium text-accent">
                            {t("aiTools.default")}
                          </span>
                        )}
                      </div>
                      <div
                        className="truncate font-mono text-[11px] text-fg-muted"
                        title={tool.path ?? ""}
                      >
                        {tool.command}
                      </div>
                    </div>
                  </div>
                  {/* Fixed slots, so the buttons line up from row to row. */}
                  <div className="flex min-w-20 shrink-0 justify-end">
                    {tool.update && (
                      <button
                        type="button"
                        disabled={jobBusy}
                        onClick={() => setConfirm({ kind: "update", tool })}
                        className={GHOST_BTN}
                      >
                        {t("aiTools.update")}
                      </button>
                    )}
                  </div>
                  <div className="flex min-w-28 shrink-0 justify-end">
                    {!isDefault && (
                      <button
                        type="button"
                        disabled={!tool.enabled || busy !== null}
                        onClick={() => setDefault(tool)}
                        className={GHOST_BTN}
                      >
                        {t("aiTools.setDefault")}
                      </button>
                    )}
                  </div>
                  <ToolSwitch tool={tool} disabled={busy !== null} onToggle={() => toggle(tool)} />
                </div>
                {logFor(tool.id)}
              </li>
            );
          })}
        </ul>
        {ctx.menu && (
          <ContextMenu x={ctx.menu.x} y={ctx.menu.y} onClose={ctx.close} testId="ai-tool-menu">
            {ctx.menu.item.update && (
              <MenuItem
                disabled={jobBusy}
                onSelect={pick((tool) => setConfirm({ kind: "update", tool }))}
              >
                {t("aiTools.update")}
              </MenuItem>
            )}
            {ctx.menu.item.id !== defaultId && (
              <MenuItem
                disabled={!ctx.menu.item.enabled || busy !== null}
                onSelect={pick(setDefault)}
              >
                {t("aiTools.setDefault")}
              </MenuItem>
            )}
            <MenuItem disabled={busy !== null} onSelect={pick(toggle)}>
              {ctx.menu.item.enabled ? t("rowMenu.disable") : t("rowMenu.enable")}
            </MenuItem>
            {ctx.menu.item.path && (
              <>
                <MenuSeparator />
                <MenuItem
                  onSelect={pick((tool) => void navigator.clipboard.writeText(tool.path ?? ""))}
                >
                  {t("rowMenu.copyPath")}
                </MenuItem>
              </>
            )}
          </ContextMenu>
        )}
      </div>

      {available.length > 0 && (
        <div>
          <button
            type="button"
            aria-expanded={showAvailable}
            onClick={() => setShowAvailable((s) => !s)}
            className="mb-2 inline-flex items-center gap-1.5 text-xs font-medium text-fg-secondary hover:text-fg-primary"
          >
            <ChevronDown
              className={`w-3.5 h-3.5 transition-transform ${showAvailable ? "" : "-rotate-90"}`}
            />
            {t("aiTools.available", { count: available.length })}
          </button>
          {showAvailable && (
            <ul className="grid grid-cols-1 gap-2 sm:grid-cols-2 lg:grid-cols-3">
              {available.map((tool) => (
                <li
                  key={tool.id}
                  data-testid={`ai-tool-${tool.id}`}
                  className={`flex flex-wrap items-center gap-2 rounded-lg border border-border bg-surface-2 px-2.5 py-2 ${
                    job?.tool === tool.id ? "sm:col-span-2 lg:col-span-3" : ""
                  }`}
                >
                  <AiToolIcon tool={tool} />
                  <span className="min-w-0 flex-1">
                    <span className="block truncate text-xs text-fg-primary">{tool.label}</span>
                    <span className="block truncate font-mono text-[10px] text-fg-muted">
                      {tool.command}
                    </span>
                  </span>
                  <Homepage tool={tool} />
                  {tool.install && (
                    <button
                      type="button"
                      disabled={jobBusy}
                      onClick={() => setConfirm({ kind: "install", tool })}
                      className="rounded-md border border-border px-2 py-0.5 text-[11px] text-fg-secondary hover:bg-surface-3 disabled:opacity-50"
                    >
                      {t("aiTools.install")}
                    </button>
                  )}
                  {logFor(tool.id)}
                </li>
              ))}
            </ul>
          )}
        </div>
      )}

      <ConfirmModal
        open={confirm !== null}
        destructive={false}
        title={
          confirm?.kind === "update-all"
            ? t("aiTools.confirmUpdateAll")
            : confirm
              ? t(confirm.kind === "install" ? "aiTools.confirmInstall" : "aiTools.confirmUpdate", {
                  tool: confirm.tool.label,
                })
              : ""
        }
        message={t("aiTools.confirmBody")}
        confirmLabel={t("aiTools.run")}
        cancelLabel={t("aiTools.cancel")}
        onConfirm={() => void startConfirmed()}
        onCancel={() => setConfirm(null)}
      >
        <pre
          data-testid="ai-tool-confirm-command"
          className="mt-3 whitespace-pre-wrap rounded-md border border-border bg-surface-1 p-2 font-mono text-[11px] text-fg-primary"
        >
          {confirmLines.join("\n")}
        </pre>
      </ConfirmModal>
    </div>
  );
}