const path = require("path");
const fs = require("fs");
const { app, BrowserWindow, ipcMain, dialog } = require("electron");
const { runGeneration } = require("../core/generator");

const isDev = process.env.NODE_ENV === "development" || !app.isPackaged;
const configPath = path.join(app.getPath("userData"), "config_nano_banana.json");

const defaultConfig = {
  api_key: "",
  api_create_url: "https://api.wuyinkeji.com/api/async/image_nanoBanana2",
  api_result_url: "https://api.wuyinkeji.com/api/async/detail",
  poll_interval_seconds: 10,
  max_wait_seconds: 300,
  r2_account_id: "",
  r2_access_key_id: "",
  r2_secret_access_key: "",
  r2_bucket: "",
  r2_public_url: "",
  default_save_dir: "",
  extra_params: [],
};

function loadConfig() {
  try {
    const raw = fs.readFileSync(configPath, "utf8");
    const data = JSON.parse(raw);
    return { ...defaultConfig, ...data };
  } catch {
    const fallback = path.join(app.getAppPath(), "config_nano_banana.json");
    try {
      if (fs.existsSync(fallback)) {
        const raw = fs.readFileSync(fallback, "utf8");
        const data = JSON.parse(raw);
        return { ...defaultConfig, ...data };
      }
    } catch (_) {}
    return { ...defaultConfig };
  }
}

function saveConfig(config) {
  fs.mkdirSync(path.dirname(configPath), { recursive: true });
  fs.writeFileSync(configPath, JSON.stringify(config, null, 2), "utf8");
}

function createWindow() {
  const win = new BrowserWindow({
    width: 900,
    height: 680,
    minWidth: 640,
    minHeight: 480,
    webPreferences: {
      preload: path.join(__dirname, "preload.js"),
      contextIsolation: true,
      nodeIntegration: false,
    },
    title: "NanoBanana 生图",
    show: false,
  });
  win.once("ready-to-show", () => win.show());

  if (isDev) {
    win.loadURL("http://localhost:5173");
    win.webContents.openDevTools();
  } else {
    win.loadFile(path.join(__dirname, "../dist/index.html"));
  }
}

app.whenReady().then(() => {
  createWindow();
  app.on("activate", () => {
    if (BrowserWindow.getAllWindows().length === 0) createWindow();
  });
});

app.on("window-all-closed", () => {
  if (process.platform !== "darwin") app.quit();
});

ipcMain.handle("getConfig", () => loadConfig());

ipcMain.handle("saveConfig", (_e, config) => {
  const current = loadConfig();
  const merged = { ...current, ...config };
  saveConfig(merged);
  return loadConfig();
});

ipcMain.handle("selectDirectory", async (_e, defaultPath) => {
  const { canceled, filePaths } = await dialog.showOpenDialog({
    properties: ["openDirectory"],
    defaultPath: defaultPath || undefined,
  });
  if (canceled || !filePaths.length) return null;
  return filePaths[0];
});

ipcMain.handle("selectReferenceFiles", async () => {
  const { canceled, filePaths } = await dialog.showOpenDialog({
    properties: ["openFile", "multiSelections"],
    filters: [
      { name: "图片", extensions: ["jpg", "jpeg", "png", "webp", "bmp", "gif"] },
    ],
  });
  if (canceled || !filePaths.length) return [];
  return filePaths;
});

ipcMain.handle("getImageDataUrl", async (_e, filePath) => {
  if (!filePath || typeof filePath !== "string") return null;
  try {
    const ext = filePath.replace(/^.*\./, "").toLowerCase();
    const mime = { jpg: "image/jpeg", jpeg: "image/jpeg", png: "image/png", webp: "image/webp", bmp: "image/bmp", gif: "image/gif" }[ext] || "image/jpeg";
    const buf = fs.readFileSync(filePath);
    return `data:${mime};base64,${buf.toString("base64")}`;
  } catch {
    return null;
  }
});

ipcMain.handle(
  "startGeneration",
  async (
    _e,
    {
      prompt,
      size,
      aspectRatio,
      refFilePaths,
      saveDir,
      extraParams,
    }
  ) => {
    const config = loadConfig();
    const win = BrowserWindow.getFocusedWindow() || BrowserWindow.getAllWindows()[0];
    const send = (step, message) => {
      if (win && !win.isDestroyed()) win.webContents.send("generationProgress", { step, message });
    };
    const extra = Array.isArray(config.extra_params)
      ? config.extra_params.reduce((acc, { key, value }) => {
          if (key != null && key !== "") acc[key] = value;
          return acc;
        }, {})
      : {};
    const mergedExtra = { ...extra, ...(extraParams || {}) };
    try {
      const result = await runGeneration(
        config,
        {
          prompt,
          size: size || config.size || "1K",
          aspectRatio: aspectRatio || config.aspectRatio || "auto",
          refFilePaths: refFilePaths || [],
          saveDir: saveDir || config.default_save_dir,
          extraParams: Object.keys(mergedExtra).length ? mergedExtra : undefined,
        },
        send
      );
      return { success: true, ...result };
    } catch (err) {
      return { success: false, error: err.message || String(err) };
    }
  }
);