import { useEffect, useState, useCallback } from "react";
import { invoke } from "@tauri-apps/api/core";
import { listen } from "@tauri-apps/api/event";
import { getCurrentWebviewWindow } from "@tauri-apps/api/webviewWindow";
import { open } from "@tauri-apps/plugin-dialog";
import type { InstallerState, NormalizedConfig } from "./types";

const appWindow = getCurrentWebviewWindow();

/**
 * 主题无关的安装器状态管理：步骤切换、路径选择、进度订阅、启动应用。
 * 所有主题共用这一份逻辑，主题只负责 UI 呈现。
 */
export function useInstaller(config: NormalizedConfig | null): InstallerState {
  const [step, setStep] = useState<1 | 2 | 3>(1);
  const [progress, setProgress] = useState(0);
  const [installPath, setInstallPath] = useState("");

  // 默认安装路径（来自 Rust）
  useEffect(() => {
    if (!config) return;
    (async () => {
      try {
        const dir = await invoke<string>("default_install_dir");
        setInstallPath(dir);
      } catch (e) {
        console.error("default_install_dir 失败", e);
      }
    })();
  }, [config]);

  // 进度事件订阅
  useEffect(() => {
    const unlisten = listen<number>("install-progress", (event) => {
      setProgress(event.payload);
      if (event.payload === 100) {
        setTimeout(() => setStep(3), 600);
      }
    });
    return () => {
      unlisten.then((f) => f());
    };
  }, []);

  const selectPath = useCallback(async () => {
    if (!config) return;
    if (step !== 1) return;
    const folder = config.appName || "App";
    try {
      const selected = await open({
        directory: true,
        multiple: false,
        defaultPath: installPath,
      });
      if (!selected) return;
      const chosen = selected as string;
      const sep = chosen.includes("\\") ? "\\" : "/";
      const segs = chosen.split(/[\\/]/).filter(Boolean);
      const last = segs[segs.length - 1] ?? "";
      if (last.toLowerCase() === folder.toLowerCase()) {
        setInstallPath(chosen);
        return;
      }
      try {
        const [exists, isEmpty] = await invoke<[boolean, boolean]>(
          "check_dir_status",
          { path: chosen },
        );
        setInstallPath(
          exists && isEmpty
            ? chosen
            : chosen.replace(/[\\/]+$/, "") + sep + folder,
        );
      } catch {
        setInstallPath(chosen.replace(/[\\/]+$/, "") + sep + folder);
      }
    } catch (err) {
      console.error("对话框启动失败", err);
    }
  }, [config, step, installPath]);

  const startInstall = useCallback(async () => {
    setStep(2);
    try {
      await invoke("run_installation", { path: installPath });
    } catch (e) {
      console.error(e);
    }
  }, [installPath]);

  const launch = useCallback(async () => {
    try {
      await invoke("launch_app");
    } catch (e) {
      console.error(e);
    }
    setTimeout(() => {
      appWindow.close();
    }, 400);
  }, []);

  const close = useCallback(async () => {
    await appWindow.close();
  }, []);

  return {
    step,
    progress,
    installPath,
    setInstallPath,
    selectPath,
    startInstall,
    launch,
    close,
  };
}