import { app, BrowserWindow, ipcMain } from "electron";
import { Capacitor } from "@capacitor/core";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

// Get __dirname equivalent in ES modules
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Set global variables that the plugin needs
global.__dirname = __dirname;
global.__filename = __filename;

// Now import the plugin after setting up globals
import { CapacitorSQLite } from "@capacitor-community/sqlite/electron/dist/plugin.js";

// Simple logger implementation
const logger = {
  // eslint-disable-next-line no-console
  log: (...args: unknown[]) => console.log("[Main]", ...args),
  // eslint-disable-next-line no-console
  error: (...args: unknown[]) => console.error("[Main]", ...args),
  // eslint-disable-next-line no-console
  info: (...args: unknown[]) => console.info("[Main]", ...args),
  // eslint-disable-next-line no-console
  warn: (...args: unknown[]) => console.warn("[Main]", ...args),
  // eslint-disable-next-line no-console
  debug: (...args: unknown[]) => console.debug("[Main]", ...args),
};

logger.info("Starting main process initialization...");

// Initialize Capacitor for Electron in main process
try {
  logger.info("About to initialize Capacitor...");
  logger.info("Capacitor before init:", {
    hasPlatform: "platform" in Capacitor,
    hasIsNativePlatform: "isNativePlatform" in Capacitor,
    platformType: typeof Capacitor.platform,
    isNativePlatformType: typeof Capacitor.isNativePlatform,
  });

  // Try direct assignment first
  try {
    (Capacitor as unknown as { platform: string }).platform = "electron";
    (Capacitor as unknown as { isNativePlatform: boolean }).isNativePlatform =
      true;
    logger.info("Direct assignment successful");
  } catch (e) {
    logger.warn("Direct assignment failed, trying defineProperty:", e);
    Object.defineProperty(Capacitor, "isNativePlatform", {
      get: () => true,
      configurable: true,
    });

    Object.defineProperty(Capacitor, "platform", {
      get: () => "electron",
      configurable: true,
    });
  }

  logger.info("Capacitor after init:", {
    platform: Capacitor.platform,
    isNativePlatform: Capacitor.isNativePlatform,
    platformType: typeof Capacitor.platform,
    isNativePlatformType: typeof Capacitor.isNativePlatform,
  });
} catch (error) {
  logger.error("Failed to initialize Capacitor:", error);
  throw error;
}

// Database path resolution utilities
const getAppDataPath = async (): Promise<string> => {
  try {
    // Read config file directly
    const configPath = path.join(__dirname, "..", "capacitor.config.json");
    const configContent = await fs.promises.readFile(configPath, "utf-8");
    const config = JSON.parse(configContent);
    const linuxPath = config?.plugins?.CapacitorSQLite?.electronLinuxLocation;

    if (linuxPath) {
      // Expand ~ to home directory
      const expandedPath = linuxPath.replace(/^~/, process.env.HOME || "");
      logger.info("[Electron] Using configured database path:", expandedPath);
      return expandedPath;
    }

    // Fallback to app.getPath if config path is not available
    const userDataPath = app.getPath("userData");
    logger.info("[Electron] Using fallback user data path:", userDataPath);
    return userDataPath;
  } catch (error) {
    logger.error("[Electron] Error getting app data path:", error);
    // Fallback to app.getPath if anything fails
    const userDataPath = app.getPath("userData");
    logger.info(
      "[Electron] Using fallback user data path after error:",
      userDataPath,
    );
    return userDataPath;
  }
};

const validateAndNormalizePath = async (filePath: string): Promise<string> => {
  // Resolve any relative paths
  const resolvedPath = path.resolve(filePath);

  // Ensure it's an absolute path
  if (!path.isAbsolute(resolvedPath)) {
    throw new Error(`Database path must be absolute: ${resolvedPath}`);
  }

  // Ensure it's within the app data directory
  const appDataPath = await getAppDataPath();
  if (!resolvedPath.startsWith(appDataPath)) {
    throw new Error(
      `Database path must be within app data directory: ${resolvedPath}`,
    );
  }

  // Normalize the path
  const normalizedPath = path.normalize(resolvedPath);

  logger.info("[Electron] Validated database path:", {
    original: filePath,
    resolved: resolvedPath,
    normalized: normalizedPath,
    appDataPath,
    isAbsolute: path.isAbsolute(normalizedPath),
    isWithinAppData: normalizedPath.startsWith(appDataPath),
  });

  return normalizedPath;
};

const ensureDirectoryExists = async (dirPath: string): Promise<void> => {
  try {
    // Normalize the path first
    const normalizedPath = path.normalize(dirPath);

    // Check if directory exists
    if (!fs.existsSync(normalizedPath)) {
      logger.info("[Electron] Creating database directory:", normalizedPath);
      await fs.promises.mkdir(normalizedPath, { recursive: true });
    }

    // Verify directory permissions
    try {
      await fs.promises.access(
        normalizedPath,
        fs.constants.R_OK | fs.constants.W_OK,
      );
      logger.info(
        "[Electron] Database directory permissions verified:",
        normalizedPath,
      );
    } catch (error) {
      logger.error("[Electron] Database directory permission error:", error);
      throw new Error(`Database directory not accessible: ${normalizedPath}`);
    }

    // Test write permissions
    const testFile = path.join(normalizedPath, ".write-test");
    try {
      await fs.promises.writeFile(testFile, "test");
      await fs.promises.unlink(testFile);
      logger.info(
        "[Electron] Database directory write test passed:",
        normalizedPath,
      );
    } catch (error) {
      logger.error("[Electron] Database directory write test failed:", error);
      throw new Error(`Database directory not writable: ${normalizedPath}`);
    }
  } catch (error) {
    logger.error(
      "[Electron] Failed to ensure database directory exists:",
      error,
    );
    throw error;
  }
};

// Initialize database paths
let dbPath: string | undefined;
let dbDir: string | undefined;
let dbPathInitialized = false;
let dbPathInitializationPromise: Promise<void> | null = null;

const initializeDatabasePaths = async (): Promise<void> => {
  // Prevent multiple simultaneous initializations
  if (dbPathInitializationPromise) {
    return dbPathInitializationPromise;
  }

  if (dbPathInitialized) {
    return;
  }

  dbPathInitializationPromise = (async () => {
    try {
      // Get the base directory from config
      dbDir = await getAppDataPath();
      logger.info("[Electron] Database directory:", dbDir);

      // Ensure the directory exists and is writable
      await ensureDirectoryExists(dbDir);

      // Construct the database path
      dbPath = await validateAndNormalizePath(
        path.join(dbDir, "timesafari.db"),
      );
      logger.info("[Electron] Database path initialized:", dbPath);

      // Verify the database file if it exists
      if (fs.existsSync(dbPath)) {
        try {
          await fs.promises.access(
            dbPath,
            fs.constants.R_OK | fs.constants.W_OK,
          );
          logger.info(
            "[Electron] Existing database file permissions verified:",
            dbPath,
          );
        } catch (error) {
          logger.error("[Electron] Database file permission error:", error);
          throw new Error(`Database file not accessible: ${dbPath}`);
        }
      }

      dbPathInitialized = true;
    } catch (error) {
      logger.error("[Electron] Failed to initialize database paths:", error);
      throw error;
    } finally {
      dbPathInitializationPromise = null;
    }
  })();

  return dbPathInitializationPromise;
};

// Initialize SQLite plugin
let sqlitePlugin: any = null;
let sqliteInitialized = false;
let sqliteInitializationPromise: Promise<void> | null = null;

async function initializeSQLite() {
  // Prevent multiple simultaneous initializations
  if (sqliteInitializationPromise) {
    return sqliteInitializationPromise;
  }

  if (sqliteInitialized) {
    return;
  }

  sqliteInitializationPromise = (async () => {
    try {
      logger.info("[Electron] Initializing SQLite plugin...");
      sqlitePlugin = new CapacitorSQLite();

      // Initialize database paths first
      await initializeDatabasePaths();

      if (!dbPath) {
        throw new Error("Database path not initialized");
      }

      // Test the plugin
      const echoResult = await sqlitePlugin.echo({ value: "test" });
      logger.info("[Electron] SQLite plugin echo test:", echoResult);

      // Initialize database connection using validated dbPath
      const connectionOptions = {
        database: dbPath,
        version: 1,
        readOnly: false,
        encryption: "no-encryption",
        useNative: true,
        mode: "rwc", // Force read-write-create mode
      };

      logger.info(
        "[Electron] Creating initial connection with options:",
        connectionOptions,
      );

      // Log the actual path being used
      logger.info("[Electron] Using database path:", dbPath);
      logger.info("[Electron] Path exists:", fs.existsSync(dbPath));
      logger.info("[Electron] Path is absolute:", path.isAbsolute(dbPath));

      const db = await sqlitePlugin.createConnection(connectionOptions);

      if (!db || typeof db !== "object") {
        throw new Error(
          `Failed to create database connection - invalid response. Path used: ${dbPath}`,
        );
      }

      // Wait a moment for the connection to be fully established
      await new Promise((resolve) => setTimeout(resolve, 100));

      // Verify the connection is working
      try {
        const result = await db.query("PRAGMA journal_mode;");
        logger.info("[Electron] Database connection verified:", result);
      } catch (error) {
        logger.error(
          "[Electron] Database connection verification failed:",
          error,
        );
        throw error;
      }

      sqliteInitialized = true;
      logger.info("[Electron] SQLite plugin initialized successfully");
    } catch (error) {
      logger.error("[Electron] Failed to initialize SQLite plugin:", error);
      throw error;
    } finally {
      sqliteInitializationPromise = null;
    }
  })();

  return sqliteInitializationPromise;
}

// Initialize app when ready
app.whenReady().then(async () => {
  logger.info("App is ready, starting initialization...");

  // Create window first
  const mainWindow = createWindow();

  // Initialize database in background
  initializeSQLite().catch((error) => {
    logger.error(
      "[Electron] Database initialization failed, but continuing:",
      error,
    );
    // Notify renderer about database status
    if (!mainWindow.isDestroyed()) {
      mainWindow.webContents.send("database-status", {
        status: "error",
        error: error.message,
      });
    }
  });

  // Handle window close
  mainWindow.on("closed", () => {
    logger.info("[Electron] Main window closed");
  });

  // Handle window close request
  mainWindow.on("close", (event) => {
    logger.info("[Electron] Window close requested");
    // Prevent immediate close if we're in the middle of something
    if (mainWindow.webContents.isLoading()) {
      event.preventDefault();
      logger.info("[Electron] Deferring window close due to loading state");
      mainWindow.webContents.once("did-finish-load", () => {
        mainWindow.close();
      });
    }
  });
});

// Check if running in dev mode
// const isDev = process.argv.includes("--inspect");

function createWindow(): BrowserWindow {
  // Resolve preload path based on environment
  const preloadPath = app.isPackaged
    ? path.join(process.resourcesPath, "preload.js")
    : path.join(__dirname, "preload.js");

  logger.log("[Electron] Preload path:", preloadPath);
  logger.log("[Electron] Preload exists:", fs.existsSync(preloadPath));

  // Log environment and paths
  logger.log("[Electron] process.cwd():", process.cwd());
  logger.log("[Electron] __dirname:", __dirname);
  logger.log("[Electron] app.getAppPath():", app.getAppPath());
  logger.log("[Electron] app.isPackaged:", app.isPackaged);
  logger.log("[Electron] process.resourcesPath:", process.resourcesPath);

  // List files in __dirname and __dirname/www
  try {
    logger.log("Files in __dirname:", fs.readdirSync(__dirname));
    const wwwDir = path.join(__dirname, "www");
    if (fs.existsSync(wwwDir)) {
      logger.log("Files in www:", fs.readdirSync(wwwDir));
    } else {
      logger.log("www directory does not exist in __dirname");
    }
  } catch (e) {
    logger.error("Error reading directories:", e);
  }

  // Create the browser window with proper error handling
  const mainWindow = new BrowserWindow({
    width: 1200,
    height: 800,
    show: false, // Don't show until ready
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      sandbox: false,
      preload: preloadPath,
      webSecurity: true,
      allowRunningInsecureContent: false,
    },
  });

  // Show window when ready
  mainWindow.once("ready-to-show", () => {
    logger.info("[Electron] Window ready to show");
    mainWindow.show();
  });

  // Handle window errors
  mainWindow.webContents.on("render-process-gone", (_event, details) => {
    logger.error("[Electron] Render process gone:", details);
  });

  mainWindow.webContents.on(
    "did-fail-load",
    (_event, errorCode, errorDescription) => {
      logger.error(
        "[Electron] Page failed to load:",
        errorCode,
        errorDescription,
      );
      logger.error("[Electron] Failed URL:", mainWindow.webContents.getURL());
    },
  );

  // Load the index.html
  let indexPath: string;
  let fileUrl: string;

  if (app.isPackaged) {
    indexPath = path.join(process.resourcesPath, "www", "index.html");
    fileUrl = `file://${indexPath}`;
    logger.info(
      "[Electron] App is packaged. Using process.resourcesPath for index.html",
    );
  } else {
    indexPath = path.resolve(__dirname, "www", "index.html");
    fileUrl = `file://${indexPath}`;
    logger.info(
      "[Electron] App is not packaged. Using __dirname for index.html",
    );
  }

  logger.info("[Electron] Resolved index.html path:", indexPath);
  logger.info("[Electron] Using file URL:", fileUrl);

  // Load the index.html with retry logic
  const loadIndexHtml = async (retryCount = 0): Promise<void> => {
    try {
      if (mainWindow.isDestroyed()) {
        logger.error(
          "[Electron] Window was destroyed before loading index.html",
        );
        return;
      }

      const exists = fs.existsSync(indexPath);
      logger.info(`[Electron] fs.existsSync for index.html: ${exists}`);

      if (!exists) {
        throw new Error(`index.html not found at path: ${indexPath}`);
      }

      // Try to read the file to verify it's accessible
      const stats = fs.statSync(indexPath);
      logger.info("[Electron] index.html stats:", {
        size: stats.size,
        mode: stats.mode,
        uid: stats.uid,
        gid: stats.gid,
      });

      // Try loadURL first
      try {
        logger.info("[Electron] Attempting to load index.html via loadURL");
        await mainWindow.loadURL(fileUrl);
        logger.info("[Electron] Successfully loaded index.html via loadURL");
      } catch (loadUrlError) {
        logger.warn(
          "[Electron] loadURL failed, trying loadFile:",
          loadUrlError,
        );
        // Fallback to loadFile
        await mainWindow.loadFile(indexPath);
        logger.info("[Electron] Successfully loaded index.html via loadFile");
      }
    } catch (error: unknown) {
      const errorMessage =
        error instanceof Error ? error.message : "Unknown error occurred";
      logger.error("[Electron] Error loading index.html:", errorMessage);

      // Retry logic
      if (retryCount < 3 && !mainWindow.isDestroyed()) {
        logger.info(
          `[Electron] Retrying index.html load (attempt ${retryCount + 1})`,
        );
        await new Promise((resolve) => setTimeout(resolve, 1000)); // Wait 1 second
        return loadIndexHtml(retryCount + 1);
      }

      // If we've exhausted retries, show error in window
      if (!mainWindow.isDestroyed()) {
        const errorHtml = `
          <html>
            <body style="font-family: sans-serif; padding: 20px;">
              <h1>Error Loading Application</h1>
              <p>Failed to load the application after multiple attempts.</p>
              <pre style="background: #f0f0f0; padding: 10px; border-radius: 4px;">${errorMessage}</pre>
            </body>
          </html>
        `;
        await mainWindow.loadURL(
          `data:text/html,${encodeURIComponent(errorHtml)}`,
        );
      }
    }
  };

  // Start loading the index.html
  loadIndexHtml().catch((error: unknown) => {
    logger.error("[Electron] Fatal error loading index.html:", error);
  });

  // Only open DevTools if not in production
  if (!app.isPackaged) {
    mainWindow.webContents.openDevTools({ mode: "detach" });
  }

  return mainWindow;
}

// Handle app ready
app.whenReady().then(createWindow);

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

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

// Handle any errors
process.on("uncaughtException", (error) => {
  logger.error("Uncaught Exception:", error);
});

// Set up IPC handlers for SQLite operations
ipcMain.handle("check-sqlite-availability", () => {
  return sqlitePlugin !== null;
});

ipcMain.handle("sqlite-echo", async (_event, value) => {
  try {
    return await sqlitePlugin.echo({ value });
  } catch (error) {
    logger.error(
      "Error in sqlite-echo:",
      error,
      JSON.stringify(error),
      (error as any)?.stack,
    );
    throw error;
  }
});

ipcMain.handle("sqlite-create-connection", async (_event, options) => {
  try {
    // Ensure database is initialized
    await initializeSQLite();

    if (!dbPath) {
      throw new Error("Database path not initialized");
    }

    // Override any provided database path with our resolved path
    const connectionOptions = {
      ...options,
      database: dbPath,
      readOnly: false,
      mode: "rwc", // Force read-write-create mode
      encryption: "no-encryption",
      useNative: true,
    };

    logger.info(
      "[Electron] Creating database connection with options:",
      connectionOptions,
    );
    const result = await sqlitePlugin.createConnection(connectionOptions);

    if (!result || typeof result !== "object") {
      throw new Error(
        "Failed to create database connection - invalid response",
      );
    }

    // Wait a moment for the connection to be fully established
    await new Promise((resolve) => setTimeout(resolve, 100));

    try {
      // Verify connection is not read-only
      const testResult = await result.query({
        statement: "PRAGMA journal_mode;",
      });
      if (testResult?.values?.[0]?.journal_mode === "off") {
        logger.error(
          "[Electron] Connection opened in read-only mode despite options",
        );
        throw new Error("Database connection opened in read-only mode");
      }
    } catch (queryError) {
      logger.error("[Electron] Error verifying connection:", queryError);
      throw queryError;
    }

    logger.info("[Electron] Database connection created successfully");
    return result;
  } catch (error) {
    logger.error("[Electron] Error in sqlite-create-connection:", error);
    throw error;
  }
});

ipcMain.handle("sqlite-execute", async (_event, options) => {
  try {
    return await sqlitePlugin.execute(options);
  } catch (error) {
    logger.error(
      "Error in sqlite-execute:",
      error,
      JSON.stringify(error),
      (error as any)?.stack,
    );
    throw error;
  }
});

ipcMain.handle("sqlite-query", async (_event, options) => {
  try {
    return await sqlitePlugin.query(options);
  } catch (error) {
    logger.error(
      "Error in sqlite-query:",
      error,
      JSON.stringify(error),
      (error as any)?.stack,
    );
    throw error;
  }
});

ipcMain.handle("sqlite-close-connection", async (_event, options) => {
  try {
    return await sqlitePlugin.closeConnection(options);
  } catch (error) {
    logger.error(
      "Error in sqlite-close-connection:",
      error,
      JSON.stringify(error),
      (error as any)?.stack,
    );
    throw error;
  }
});

ipcMain.handle("sqlite-is-available", async () => {
  return sqlitePlugin !== null;
});