/**
 * @file The confirmation a cherry-pick or revert opens with, showing exactly
 * what will happen before anything does (the reference tools' preview): the
 * commits in the order git will apply them (numbered — read from the server,
 * which orders them the same way the action will), the branch they land on,
 * whether the working tree is clean, and what happens on a conflict. Confirm
 * is disabled, with the reason, when the server would refuse (a dirty tree, a
 * subfolder workspace, another operation open, a merge commit).
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { CheckCircle2, AlertTriangle } from "lucide-react";
import { api, type GitTarget } from "../../../lib/api";
import type { PickPlan, PickResult } from "../../../lib/gitHistory";
import { GitModal, ModalButton } from "./GitModal";

export function CherryPickDialog({
  target,
  op,
  shas,
  onClose,
  onDone,
}: {
  target: GitTarget;
  op: "cherry-pick" | "revert";
  shas: string[];
  onClose: () => void;
  onDone: (r: PickResult) => void;
}) {
  const { t } = useTranslation(["gitHistory"]);
  const [plan, setPlan] = useState<PickPlan | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [running, setRunning] = useState(false);

  useEffect(() => {
    let live = true;
    void api.lanes.gitHistory
      .pickPlan(target, op, shas)
      .then((r) => live && (r.available ? setPlan(r) : setError(t("planUnavailable"))))
      .catch((err) => live && setError(err instanceof Error ? err.message : String(err)));
    return () => {
      live = false;
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps -- one plan per dialog
  }, []);

  const branch = plan?.branch ?? "HEAD";
  const blocker = !plan
    ? null
    : plan.busy
      ? t("blockBusy")
      : !plan.repoRoot
        ? t("blockSubdir")
        : !plan.clean
          ? t("blockDirty")
          : null;
  const n = plan?.commits.length ?? shas.length;
  const title =
    op === "revert" ? t("revertTitle", { count: n }) : t("pickTitle", { count: n, branch });

  const run = async () => {
    setRunning(true);
    setError(null);
    try {
      onDone(
        await api.lanes.gitHistory.pick(
          target,
          op,
          plan!.commits.map((c) => c.sha)
        )
      );
    } catch (err) {
      setError(err instanceof Error ? err.message : String(err));
      setRunning(false);
    }
  };

  return (
    <GitModal
      title={title}
      onClose={onClose}
      testId="pick-dialog"
      footer={
        <>
          <ModalButton onClick={onClose}>{t("cancel")}</ModalButton>
          <ModalButton
            primary
            testId="pick-confirm"
            disabled={!plan || !!blocker || running}
            title={blocker ?? undefined}
            onClick={() => void run()}
          >
            {running
              ? t("running")
              : op === "revert"
                ? t("revertN", { count: n })
                : t("pickN", { count: n, branch })}
          </ModalButton>
        </>
      }
    >
      <div className="space-y-2 text-[12px] text-fg-secondary">
        {!plan && !error && <p className="text-fg-muted">{t("planning")}</p>}
        {plan && (
          <>
            <p className="[overflow-wrap:anywhere]">
              {op === "revert"
                ? t("revertIntro", { count: n, branch })
                : t("pickIntro", { count: n, branch })}
            </p>
            <ol
              data-testid="pick-plan"
              className="space-y-0.5 rounded border border-border-light bg-surface-0 p-1.5"
            >
              {plan.commits.map((c, i) => (
                <li key={c.sha} className="flex min-w-0 items-baseline gap-1.5">
                  <span className="w-5 shrink-0 text-right text-fg-muted">{i + 1}.</span>
                  <span className="shrink-0 font-mono text-[11px] text-fg-muted">{c.short}</span>
                  <span className="min-w-0 flex-1 truncate text-fg-primary" title={c.subject}>
                    {c.subject}
                  </span>
                </li>
              ))}
            </ol>
            <p className="flex items-center gap-1.5">
              {plan.clean && plan.repoRoot && !plan.busy ? (
                <CheckCircle2 className="h-3.5 w-3.5 shrink-0 text-status-success" aria-hidden />
              ) : (
                <AlertTriangle className="h-3.5 w-3.5 shrink-0 text-status-warning" aria-hidden />
              )}
              <span data-testid="pick-tree-state" className="[overflow-wrap:anywhere]">
                {blocker ?? t("treeClean")}
              </span>
            </p>
            <p className="text-fg-muted">{t(op === "revert" ? "revertResult" : "pickResult")}</p>
            <p className="text-fg-muted">{t("onConflict", { op: t(`op.${op}`) })}</p>
          </>
        )}
        {error && (
          <p
            role="alert"
            className="whitespace-pre-wrap text-status-danger [overflow-wrap:anywhere]"
          >
            {error}
          </p>
        )}
      </div>
    </GitModal>
  );
}