/**
 * @file One file's history (Show History), like GitLens' File History: every
 * commit that touched it, newest first, followed across renames (`git log
 * --follow`). A version opens that commit's diff of the file under the name
 * it had there (the panel's own diff viewer); Blame opens the file as it was
 * at that version with each line's commit (BlameView), and a rename says
 * where it came from. Paged with Load more.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useCallback, useEffect, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import { api, type GitTarget } from "../../../lib/api";
import type { FileVersion } from "../../../lib/gitHistory";
import { timeAgo } from "../../../lib/format";
import { BlameView } from "./BlameView";

const PAGE = 100;

export function FileHistory({
  target,
  path,
  reread,
  onOpenVersion,
  onViewCommit,
  onWholeBranch,
}: {
  target: GitTarget;
  path: string;
  reread: number;
  /** That version's diff of the file: its name THEN, and the commit. */
  onOpenVersion: (path: string, sha: string) => void;
  onViewCommit: (sha: string) => void;
  onWholeBranch: () => void;
}) {
  const { t } = useTranslation(["gitHistory", "lanes"]);
  const [versions, setVersions] = useState<FileVersion[] | null>(null);
  const [hasMore, setHasMore] = useState(false);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [blame, setBlame] = useState<{ path: string; rev: string } | null>(null);
  const seq = useRef(0);

  useEffect(() => {
    const mine = ++seq.current;
    setVersions(null);
    setError(null);
    setLoading(true);
    void api.lanes.gitHistory
      .fileHistory(target, path, { limit: PAGE })
      .then((r) => {
        if (seq.current !== mine) return;
        setVersions(r.available ? r.commits : []);
        setHasMore(r.available && r.hasMore);
      })
      .catch(
        (err) => seq.current === mine && setError(err instanceof Error ? err.message : String(err))
      )
      .finally(() => seq.current === mine && setLoading(false));
    // eslint-disable-next-line react-hooks/exhaustive-deps -- target is stable per panel
  }, [path, reread]);

  const more = useCallback(() => {
    if (!versions || loading) return;
    const mine = ++seq.current;
    setLoading(true);
    void api.lanes.gitHistory
      .fileHistory(target, path, { limit: PAGE, skip: versions.length })
      .then((r) => {
        if (seq.current !== mine || !r.available) return;
        setVersions((v) => [...(v ?? []), ...r.commits]);
        setHasMore(r.hasMore);
      })
      .catch(
        (err) => seq.current === mine && setError(err instanceof Error ? err.message : String(err))
      )
      .finally(() => seq.current === mine && setLoading(false));
  }, [versions, loading, target, path]);

  return (
    <div data-testid="file-history" className="flex min-h-0 flex-col gap-1">
      <div
        data-testid="lane-changes-history-file"
        className="flex items-center gap-1.5 px-1 text-[11px] text-fg-secondary"
      >
        <span className="min-w-0 flex-1 [overflow-wrap:anywhere]">
          {t("lanes:changes.historyOfFile", { path })}
        </span>
        <button
          type="button"
          onClick={() => setBlame({ path, rev: "work" })}
          className="shrink-0 rounded border border-border-light px-1.5 py-0.5 text-fg-secondary hover:bg-surface-2 hover:text-fg-primary"
        >
          {t("blame")}
        </button>
        <button
          type="button"
          onClick={onWholeBranch}
          className="shrink-0 rounded px-1 text-fg-muted hover:bg-surface-2 hover:text-fg-primary"
        >
          {t("lanes:changes.historyWholeBranch")}
        </button>
      </div>
      {error && (
        <p role="alert" className="px-1 text-[11px] text-status-danger [overflow-wrap:anywhere]">
          {error}
        </p>
      )}
      {versions === null && !error && (
        <p className="px-1 text-[11px] text-fg-muted">{t("lanes:changes.loading")}</p>
      )}
      {versions && versions.length === 0 && (
        <p className="px-1 text-[11px] text-fg-muted">{t("lanes:changes.noCommits")}</p>
      )}
      <ul>
        {versions?.map((v) => (
          <li key={v.sha} className="group flex items-center gap-1 rounded px-1 hover:bg-surface-2">
            <button
              type="button"
              onClick={() => onOpenVersion(v.path, v.sha)}
              className="flex min-w-0 flex-1 flex-col py-0.5 text-left"
            >
              <span className="flex min-w-0 items-baseline gap-1.5">
                <span
                  className="w-3 shrink-0 font-mono text-[10px] text-fg-muted"
                  title={t(`status.${v.status}`, { defaultValue: v.status })}
                >
                  {v.status}
                </span>
                <span className="shrink-0 font-mono text-[10px] text-fg-muted">{v.short}</span>
                <span
                  className="min-w-0 flex-1 truncate text-[11px] text-fg-primary"
                  title={v.subject}
                >
                  {v.subject}
                </span>
              </span>
              <span className="flex min-w-0 items-baseline gap-1.5 pl-[1.2rem] text-[10px] text-fg-muted">
                <span className="min-w-0 truncate">{v.author}</span>
                <span className="shrink-0" title={new Date(v.date).toLocaleString()}>
                  {timeAgo(v.date)}
                </span>
                {v.from && (
                  <span className="min-w-0 [overflow-wrap:anywhere]">
                    {t("renamedFrom", { from: v.from })}
                  </span>
                )}
              </span>
            </button>
            {v.status !== "D" && (
              <button
                type="button"
                onClick={() => setBlame({ path: v.path, rev: v.sha })}
                className="shrink-0 rounded px-1 text-[10px] text-fg-muted hover:bg-surface-3 hover:text-fg-primary"
              >
                {t("blame")}
              </button>
            )}
            <button
              type="button"
              onClick={() => onViewCommit(v.sha)}
              className="shrink-0 rounded px-1 text-[10px] text-fg-muted hover:bg-surface-3 hover:text-fg-primary"
            >
              {t("commit")}
            </button>
          </li>
        ))}
      </ul>
      {hasMore && (
        <button
          type="button"
          data-testid="file-history-more"
          disabled={loading}
          onClick={more}
          className="w-full rounded px-1 py-1 text-[11px] text-fg-secondary hover:bg-surface-2 disabled:opacity-40"
        >
          {loading ? t("lanes:changes.loading") : t("lanes:changes.loadMore")}
        </button>
      )}
      {blame && (
        <BlameView
          target={target}
          path={blame.path}
          rev={blame.rev}
          onClose={() => setBlame(null)}
          onOpenCommit={(sha) => {
            setBlame(null);
            onViewCommit(sha);
          }}
        />
      )}
    </div>
  );
}