/**
 * @file SessionReplay — an ENDED session opened in its workspace
 * (`/workspace?lane=<id>&session=<sessionId>`), the way Claude Desktop opens
 * an old one: its conversation, read-only (`ConversationView`), and a prompt
 * box under it (a pasted image rides along as a thumbnail). Opening it resumes
 * nothing; only SENDING a message does — `POST /api/lanes/:id/start` with
 * `resumeSessionId`, that prompt and `slot: "auto"` (the server picks the free
 * tab), after which `onResumed` opens the pane (`&run=`). The panes are re-read
 * first, and a session some tab already holds opens THAT tab instead of a
 * second `--resume` (the server refuses one too, `ESESSIONLIVE`) — the typed
 * message is pasted there (never sent: Enter is the user's), with a toast; while
 * it is live the composer is off. Only Claude and Codex can resume a session by id —
 * any other tool's session offers a new session from the workspace home
 * instead. The header carries the transcript page's Resume/Fork
 * (`SessionResumeButton`, behind its warning). The session's tool and folder
 * come from its row (`GET /api/sessions/:id`), so a resume runs on the tool the
 * session ran on (the server enforces that too).
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { useNavigate } from "react-router-dom";
import { ArrowUp, SquareTerminal } from "lucide-react";
import { api, type RunHandle } from "../../lib/api";
import type { Lane, Session } from "../../lib/types";
import { ConversationView } from "../conversation/ConversationView";
import { PromptEditor, promptWithImages, type PromptImage } from "../run/RunSetup";
import { startInFreeTabDetailed } from "./startSession";
import { pasteToRun } from "../../lib/panePaste";
import { toast } from "../../lib/toast";
import i18n from "../../i18n";
import { liveRunFor } from "./WorkspaceSessionList";
import { SessionResumeButton } from "./SessionResumeButton";

/** A message for a session that a tab already holds goes into THAT tab as a
 *  paste, once its terminal is on screen (it mounts after the navigation);
 *  a toast says where it went — or, failing that, carries the text. */
function pasteWhenShown(runId: string, text: string) {
  let tries = 0;
  const tick = () => {
    if (pasteToRun(runId, text)) toast.success(i18n.t("lanes:replay.pasted"));
    else if (++tries < 30) window.setTimeout(tick, 100);
    else toast.error(i18n.t("lanes:replay.notPasted", { text }));
  };
  window.setTimeout(tick, 0);
}

/** The tools whose launcher resumes a session BY ID (server/lib/pty-run.js). */
const RESUMABLE = new Set(["claude", "codex"]);

export function SessionReplay({
  lane,
  sessionId,
  liveRuns,
  onResumed,
}: {
  lane: Lane;
  sessionId: string;
  /** Every live dashboard pane: a session one of them holds opens that pane. */
  liveRuns: RunHandle[];
  /** Opens the pane the resume started in — of `laneId` when it is another
   *  (nested) workspace's pane that holds the session. */
  onResumed: (runId: string, laneId?: number) => void;
}) {
  const { t } = useTranslation("lanes");
  const navigate = useNavigate();
  const [session, setSession] = useState<Session | null>(null);
  const [prompt, setPrompt] = useState("");
  const [images, setImages] = useState<PromptImage[]>([]);
  const [uploading, setUploading] = useState(false);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    let live = true;
    setSession(null);
    setPrompt("");
    setImages([]);
    setError(null);
    api.sessions
      .get(sessionId, { events: false })
      .then((r) => live && setSession(r.session))
      .catch(() => undefined);
    return () => {
      live = false;
    };
  }, [sessionId]);

  const tool = session?.tool || "claude";
  const resumable = RESUMABLE.has(tool);
  const livePane = liveRunFor(lane, liveRuns, sessionId);
  const text = promptWithImages(prompt, images);

  const send = async () => {
    if (!text || busy || uploading || livePane || !resumable) return;
    setBusy(true);
    setError(null);
    try {
      // Re-read: a tab that took this session since the list was read is
      // opened, never resumed a second time.
      const fresh = await api.run
        .list()
        .then((r) => r.items ?? [])
        .catch(() => liveRuns);
      const holder = liveRunFor(lane, fresh, sessionId);
      const r = holder
        ? { runId: holder.id, laneId: lane.id, held: true }
        : await startInFreeTabDetailed(lane.id, { resumeSessionId: sessionId, prompt: text });
      setPrompt("");
      images.forEach((i) => i.url && URL.revokeObjectURL(i.url));
      setImages([]);
      onResumed(r.runId, r.laneId);
      // Held already: the prompt reached nothing yet — paste it there.
      if (r.held) pasteWhenShown(r.runId, text);
    } catch (err) {
      setError(err instanceof Error ? err.message : String(err));
    } finally {
      setBusy(false);
    }
  };

  return (
    <div
      data-testid="session-replay"
      data-prompt-drop
      className="flex min-h-0 flex-1 flex-col gap-2"
    >
      {session && (
        <div className="flex justify-end">
          <SessionResumeButton session={session} />
        </div>
      )}
      <div className="min-h-0 flex-1 overflow-hidden">
        <ConversationView sessionId={sessionId} fill />
      </div>
      {livePane ? (
        <div
          data-testid="session-replay-live"
          className="mx-auto flex w-full max-w-3xl items-center gap-2 rounded-2xl border border-border p-3 text-xs text-fg-secondary"
        >
          <span className="min-w-0 flex-1">{t("replay.live")}</span>
          <button
            type="button"
            onClick={() => onResumed(livePane.id)}
            className="btn-ghost text-xs"
          >
            <SquareTerminal className="h-4 w-4" />
            {t("resume.openPane")}
          </button>
        </div>
      ) : session && !resumable ? (
        <div
          data-testid="session-replay-no-resume"
          className="mx-auto flex w-full max-w-3xl items-center gap-2 rounded-2xl border border-border p-3 text-xs text-fg-secondary"
        >
          <span className="min-w-0 flex-1">{t("replay.noResume", { tool })}</span>
          <button
            type="button"
            onClick={() => navigate(`/workspace?lane=${lane.id}`)}
            className="btn-ghost text-xs"
          >
            {t("replay.newSession")}
          </button>
        </div>
      ) : (
        <div className="mx-auto w-full max-w-3xl rounded-2xl border border-border p-2 shadow-sm transition-colors focus-within:border-accent/50">
          <PromptEditor
            bare
            images={images}
            onImagesChange={setImages}
            onBusyChange={setUploading}
            value={prompt}
            onChange={setPrompt}
            onSubmit={() => void send()}
            placeholder={t("replay.placeholder")}
            rows={2}
            slash={tool === "claude"}
            fileCwd={session?.cwd || lane.cwd}
            lane={lane.id}
          />
          <div className="mt-1 flex items-center gap-2">
            <span className="text-[11px] text-fg-muted">{t("replay.hint")}</span>
            <button
              type="button"
              data-testid="session-replay-send"
              onClick={() => void send()}
              disabled={busy || uploading || !text}
              aria-label={t("replay.send")}
              title={t("replay.send")}
              className="ml-auto flex h-8 w-8 items-center justify-center rounded-full bg-accent-solid text-white transition-opacity hover:opacity-90 disabled:opacity-40"
            >
              <ArrowUp className="h-4 w-4" />
            </button>
          </div>
          {error && (
            <p role="alert" className="mt-1 text-xs text-status-danger">
              {error}
            </p>
          )}
        </div>
      )}
    </div>
  );
}