/**
 * @file ClaudeAgentHubSettings.tsx
 * @description The dashboard's own settings that belong to Claude Code, shown
 * under Settings → Claude Code → Overview: the CLAUDE_HOME the server reads
 * transcripts and config from, the AgentHub hooks installed into Claude Code
 * with a Reinstall button (named as the plugin's when the enabled `agenthub`
 * plugin provides them), and a link to the Claude table on the Pricing page.
 * Changing CLAUDE_HOME asks first.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useState, useCallback } from "react";
import { useTranslation } from "react-i18next";
import { RefreshCw, Plug, AlertTriangle, RotateCcw, CheckCircle, XCircle } from "lucide-react";
import { api } from "../../lib/api";
import { Skeleton } from "../Skeleton";
import { HomeDirSetting } from "./HomeDirSetting";
import { PricingLink } from "./PricingSettings";

type HooksInfo = {
  installed: boolean;
  path: string;
  hooks: Record<string, boolean>;
  source?: "plugin";
};

/**
 * Claude Code's AgentHub settings: CLAUDE_HOME, hook status and the pricing link.
 * @param onHomeChanged - called after CLAUDE_HOME was saved (the page re-reads
 *   the config it lists, which lives under that home).
 * @returns The three sections, each with its own id.
 */
export function ClaudeAgentHubSettings({ onHomeChanged }: { onHomeChanged?: () => void } = {}) {
  const { t } = useTranslation("settings");
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [hooks, setHooks] = useState<HooksInfo | null>(null);
  const [actionLoading, setActionLoading] = useState<string | null>(null);
  const [actionResult, setActionResult] = useState<{
    key: string;
    message: string;
    isError: boolean;
  } | null>(null);

  const load = useCallback(async () => {
    try {
      const infoRes = await api.settings.info();
      setHooks(infoRes.hooks);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : t("messages.failedLoad"));
    } finally {
      setLoading(false);
    }
  }, [t]);

  useEffect(() => {
    load();
  }, [load]);

  // Hooks can be (re)installed from a terminal while this tab is open; keep the
  // badge current the way the old Settings page did, every 10 s.
  useEffect(() => {
    const id = setInterval(() => {
      if (!(document.visibilityState === "visible")) return;
      api.settings
        .info()
        .then((r) => setHooks(r.hooks))
        .catch(() => {});
    }, 10000);
    return () => clearInterval(id);
  }, []);

  useEffect(() => {
    if (!actionResult) return;
    const timeout = setTimeout(() => setActionResult(null), 5000);
    return () => clearTimeout(timeout);
  }, [actionResult]);

  const runAction = async (key: string, fn: () => Promise<string>) => {
    setActionLoading(key);
    setActionResult(null);
    try {
      const message = await fn();
      setActionResult({ key, message, isError: false });
      await load();
    } catch (err) {
      setActionResult({
        key,
        message: t("messages.actionFailed", {
          message: err instanceof Error ? err.message : t("messages.unknownError"),
        }),
        isError: true,
      });
    } finally {
      setActionLoading(null);
    }
  };

  const handleReinstallHooks = () =>
    runAction("hooks", async () => {
      const res = await api.settings.reinstallHooks();
      return res.ok ? t("hooks.success") : t("hooks.failed");
    });

  const actionBanner = (keys: string[]) => {
    const match = actionResult && keys.includes(actionResult.key) ? actionResult : null;
    if (!match) return null;
    return (
      <div
        className={`px-3 py-2 rounded-lg text-xs ${
          match.isError
            ? "bg-status-danger/10 border border-status-danger/20 text-status-danger"
            : "bg-status-success/10 border border-status-success/20 text-status-success"
        }`}
      >
        {match.message}
      </div>
    );
  };

  if (loading) {
    return (
      <div className="space-y-3" aria-busy="true">
        <Skeleton className="h-4 w-40" />
        <Skeleton className="h-3 w-full" />
        <Skeleton className="h-3 w-5/6" />
      </div>
    );
  }

  return (
    <div className="space-y-8">
      <HomeDirSetting
        id="claude-home"
        title={t("claudeHome.title")}
        description={t("claudeHome.description")}
        note={t("claudeHome.note")}
        placeholder={t("claudeHome.placeholder")}
        confirm={{ title: t("claudeHome.confirmTitle"), message: t("claudeHome.confirmBody") }}
        load={() =>
          api.settings.claudeHome
            .get()
            .then((r) => ({ value: r.claude_home, envOwned: !!r.env_owned }))
        }
        save={(p) =>
          api.settings.claudeHome.set(p).then((r) => {
            void load();
            onHomeChanged?.();
            return { value: r.claude_home, envOwned: !!r.env_owned };
          })
        }
      />
      {error && (
        <div className="px-4 py-2.5 bg-status-danger/10 border border-status-danger/20 rounded-lg text-sm text-status-danger">
          {error}
        </div>
      )}

      {/* ─── HOOK CONFIGURATION ─── */}
      <section id="hooks" className="scroll-mt-24">
        <h3 className="text-sm font-medium text-fg-secondary flex items-center gap-2 mb-1">
          <Plug className="w-4 h-4 text-fg-muted" />
          {t("hooks.title")}
        </h3>
        <p className="text-xs text-fg-muted mb-4">{t("hooks.description")}</p>

        <div className="card p-5 space-y-4">
          <div className="flex items-center justify-between flex-wrap gap-3">
            <div className="flex items-center gap-3">
              {hooks?.installed ? (
                <span className="inline-flex items-center gap-1.5 text-xs font-medium text-status-success bg-status-success/10 border border-status-success/20 px-2.5 py-1 rounded-full">
                  <CheckCircle className="w-3.5 h-3.5" /> {t("hooks.allInstalled")}
                </span>
              ) : (
                <span className="inline-flex items-center gap-1.5 text-xs font-medium text-status-warning bg-status-warning/10 border border-status-warning/20 px-2.5 py-1 rounded-full">
                  <AlertTriangle className="w-3.5 h-3.5" /> {t("hooks.incomplete")}
                </span>
              )}
            </div>
            <button
              onClick={handleReinstallHooks}
              disabled={actionLoading !== null}
              className="btn-ghost text-xs disabled:opacity-50"
            >
              {actionLoading === "hooks" ? (
                <RefreshCw className="w-3.5 h-3.5 animate-spin" />
              ) : (
                <RotateCcw className="w-3.5 h-3.5" />
              )}
              {t("hooks.reinstall")}
            </button>
          </div>

          {actionBanner(["hooks"])}

          {hooks && (
            <>
              <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-5 gap-2">
                {Object.entries(hooks.hooks).map(([hook, active]) => (
                  <div
                    key={hook}
                    className="flex items-center gap-1.5 text-xs px-2.5 py-1.5 rounded-md bg-surface-2"
                  >
                    {active ? (
                      <CheckCircle className="w-3 h-3 text-status-success flex-shrink-0" />
                    ) : (
                      <XCircle className="w-3 h-3 text-status-danger flex-shrink-0" />
                    )}
                    <span className="text-fg-secondary truncate">{hook}</span>
                  </div>
                ))}
              </div>
              {hooks.source === "plugin" ? (
                <p className="text-[11px] text-fg-muted">{t("hooks.plugin")}</p>
              ) : (
                <p className="text-[11px] text-fg-muted font-mono truncate">{hooks.path}</p>
              )}
            </>
          )}
        </div>
      </section>

      <PricingLink vendor="claude" />
    </div>
  );
}