import fs from "fs";
import path from "path";
import { Database } from "bun:sqlite";
import { v4 as uuidv4 } from "uuid";

// Command line arguments
const args = process.argv.slice(2);
const command = args[0] || "check";

// Ensure data directory exists
const dataDir = path.join(process.cwd(), "data");
if (!fs.existsSync(dataDir)) {
  fs.mkdirSync(dataDir, { recursive: true });
}

// Database paths
const rootDbFile = path.join(process.cwd(), "gitea-mirror.db");
const rootDevDbFile = path.join(process.cwd(), "gitea-mirror-dev.db");
const dataDbFile = path.join(dataDir, "gitea-mirror.db");
const dataDevDbFile = path.join(dataDir, "gitea-mirror-dev.db");

// Database path - ensure we use absolute path
const dbPath = path.join(dataDir, "gitea-mirror.db");

/**
 * Ensure all required tables exist
 */
async function ensureTablesExist() {
  // Create or open the database
  const db = new Database(dbPath);

  const requiredTables = [
    "users",
    "configs",
    "repositories",
    "organizations",
    "mirror_jobs",
  ];

  for (const table of requiredTables) {
    try {
      // Check if table exists
      const result = db.query(`SELECT name FROM sqlite_master WHERE type='table' AND name='${table}'`).get();

      if (!result) {
        console.warn(`⚠️  Table '${table}' is missing. Creating it now...`);

        switch (table) {
          case "users":
            db.exec(`
              CREATE TABLE users (
                id TEXT PRIMARY KEY,
                username TEXT NOT NULL,
                password TEXT NOT NULL,
                email TEXT NOT NULL,
                created_at INTEGER NOT NULL,
                updated_at INTEGER NOT NULL
              )
            `);
            break;
          case "configs":
            db.exec(`
              CREATE TABLE configs (
                id TEXT PRIMARY KEY,
                user_id TEXT NOT NULL,
                name TEXT NOT NULL,
                is_active INTEGER NOT NULL DEFAULT 1,
                github_config TEXT NOT NULL,
                gitea_config TEXT NOT NULL,
                include TEXT NOT NULL DEFAULT '["*"]',
                exclude TEXT NOT NULL DEFAULT '[]',
                schedule_config TEXT NOT NULL,
                created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
                updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
                FOREIGN KEY (user_id) REFERENCES users(id)
              )
            `);
            break;
          case "repositories":
            db.exec(`
              CREATE TABLE repositories (
                id TEXT PRIMARY KEY,
                user_id TEXT NOT NULL,
                config_id TEXT NOT NULL,
                name TEXT NOT NULL,
                full_name TEXT NOT NULL,
                url TEXT NOT NULL,
                clone_url TEXT NOT NULL,
                owner TEXT NOT NULL,
                organization TEXT,
                mirrored_location TEXT DEFAULT '',
                is_private INTEGER NOT NULL DEFAULT 0,
                is_fork INTEGER NOT NULL DEFAULT 0,
                forked_from TEXT,
                has_issues INTEGER NOT NULL DEFAULT 0,
                is_starred INTEGER NOT NULL DEFAULT 0,
                is_archived INTEGER NOT NULL DEFAULT 0,
                size INTEGER NOT NULL DEFAULT 0,
                has_lfs INTEGER NOT NULL DEFAULT 0,
                has_submodules INTEGER NOT NULL DEFAULT 0,
                default_branch TEXT NOT NULL,
                visibility TEXT NOT NULL DEFAULT 'public',
                status TEXT NOT NULL DEFAULT 'imported',
                last_mirrored INTEGER,
                error_message TEXT,
                created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
                updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
                FOREIGN KEY (user_id) REFERENCES users(id),
                FOREIGN KEY (config_id) REFERENCES configs(id)
              )
            `);
            break;
          case "organizations":
            db.exec(`
              CREATE TABLE organizations (
                id TEXT PRIMARY KEY,
                user_id TEXT NOT NULL,
                config_id TEXT NOT NULL,
                name TEXT NOT NULL,
                avatar_url TEXT NOT NULL,
                membership_role TEXT NOT NULL DEFAULT 'member',
                is_included INTEGER NOT NULL DEFAULT 1,
                status TEXT NOT NULL DEFAULT 'imported',
                last_mirrored INTEGER,
                error_message TEXT,
                repository_count INTEGER NOT NULL DEFAULT 0,
                created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
                updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
                FOREIGN KEY (user_id) REFERENCES users(id),
                FOREIGN KEY (config_id) REFERENCES configs(id)
              )
            `);
            break;
          case "mirror_jobs":
            db.exec(`
              CREATE TABLE mirror_jobs (
                id TEXT PRIMARY KEY,
                user_id TEXT NOT NULL,
                repository_id TEXT,
                repository_name TEXT,
                organization_id TEXT,
                organization_name TEXT,
                details TEXT,
                status TEXT NOT NULL DEFAULT 'imported',
                message TEXT NOT NULL,
                timestamp TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
                FOREIGN KEY (user_id) REFERENCES users(id)
              )
            `);
            break;
        }
        console.log(`✅ Table '${table}' created successfully.`);
      }
    } catch (error) {
      console.error(`❌ Error checking table '${table}':`, error);
      process.exit(1);
    }
  }
}

/**
 * Check database status
 */
async function checkDatabase() {
  console.log("Checking database status...");

  // Check for database files in the root directory (which is incorrect)
  if (fs.existsSync(rootDbFile)) {
    console.warn(
      "⚠️  WARNING: Database file found in root directory: gitea-mirror.db"
    );
    console.warn("This file should be in the data directory.");
    console.warn(
      'Run "bun run manage-db fix" to fix this issue or "bun run cleanup-db" to remove it.'
    );
  }

  // Check if database files exist in the data directory (which is correct)
  if (fs.existsSync(dataDbFile)) {
    console.log(
      "✅ Database file found in data directory: data/gitea-mirror.db"
    );

    // Check for users
    try {
      const db = new Database(dbPath);

      // Check for users
      const userCountResult = db.query(`SELECT COUNT(*) as count FROM users`).get();
      const userCount = userCountResult?.count || 0;

      if (userCount === 0) {
        console.log("ℹ️  No users found in the database.");
        console.log(
          "When you start the application, you will be directed to the signup page"
        );
        console.log("to create an initial admin account.");
      } else {
        console.log(`✅ ${userCount} user(s) found in the database.`);
        console.log("The application will show the login page on startup.");
      }

      // Check for configurations
      const configCountResult = db.query(`SELECT COUNT(*) as count FROM configs`).get();
      const configCount = configCountResult?.count || 0;

      if (configCount === 0) {
        console.log("ℹ️  No configurations found in the database.");
        console.log(
          "You will need to set up your GitHub and Gitea configurations after login."
        );
      } else {
        console.log(
          `✅ ${configCount} configuration(s) found in the database.`
        );
      }
    } catch (error) {
      console.error("❌ Error connecting to the database:", error);
      console.warn(
        'The database file might be corrupted. Consider running "bun run manage-db init" to recreate it.'
      );
    }
  } else {
    console.warn("⚠️  WARNING: Database file not found in data directory.");
    console.warn('Run "bun run manage-db init" to create it.');
  }
}

// Database schema updates and migrations have been removed
// since the application is not used by anyone yet

/**
 * Initialize the database
 */
async function initializeDatabase() {
  // Check if database already exists first
  if (fs.existsSync(dataDbFile)) {
    console.log("⚠️  Database already exists at data/gitea-mirror.db");
    console.log(
      'If you want to recreate the database, run "bun run cleanup-db" first.'
    );
    console.log(
      'Or use "bun run manage-db reset-users" to just remove users without recreating tables.'
    );

    // Check if we can connect to it
    try {
      const db = new Database(dbPath);
      db.query(`SELECT COUNT(*) as count FROM users`).get();
      console.log("✅ Database is valid and accessible.");
      return;
    } catch (error) {
      console.error("❌ Error connecting to the existing database:", error);
      console.log(
        "The database might be corrupted. Proceeding with reinitialization..."
      );
    }
  }

  console.log(`Initializing database at ${dbPath}...`);

  try {
    const db = new Database(dbPath);

    // Create tables if they don't exist
    db.exec(`
      CREATE TABLE IF NOT EXISTS users (
        id TEXT PRIMARY KEY,
        username TEXT NOT NULL,
        password TEXT NOT NULL,
        email TEXT NOT NULL,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    `);

    // NOTE: We no longer create a default admin user - user will create one via signup page

    db.exec(`
      CREATE TABLE IF NOT EXISTS configs (
        id TEXT PRIMARY KEY,
        user_id TEXT NOT NULL,
        name TEXT NOT NULL,
        is_active INTEGER NOT NULL DEFAULT 1,
        github_config TEXT NOT NULL,
        gitea_config TEXT NOT NULL,
        include TEXT NOT NULL DEFAULT '["*"]',
        exclude TEXT NOT NULL DEFAULT '[]',
        schedule_config TEXT NOT NULL,
        created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
        updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
        FOREIGN KEY (user_id) REFERENCES users(id)
      )
    `);

    db.exec(`
      CREATE TABLE IF NOT EXISTS repositories (
        id TEXT PRIMARY KEY,
        user_id TEXT NOT NULL,
        config_id TEXT NOT NULL,
        name TEXT NOT NULL,
        full_name TEXT NOT NULL,
        url TEXT NOT NULL,
        clone_url TEXT NOT NULL,
        owner TEXT NOT NULL,
        organization TEXT,
        mirrored_location TEXT DEFAULT '',
        is_private INTEGER NOT NULL DEFAULT 0,
        is_fork INTEGER NOT NULL DEFAULT 0,
        forked_from TEXT,
        has_issues INTEGER NOT NULL DEFAULT 0,
        is_starred INTEGER NOT NULL DEFAULT 0,
        is_archived INTEGER NOT NULL DEFAULT 0,
        size INTEGER NOT NULL DEFAULT 0,
        has_lfs INTEGER NOT NULL DEFAULT 0,
        has_submodules INTEGER NOT NULL DEFAULT 0,
        default_branch TEXT NOT NULL,
        visibility TEXT NOT NULL DEFAULT 'public',
        status TEXT NOT NULL DEFAULT 'imported',
        last_mirrored INTEGER,
        error_message TEXT,
        created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
        updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
        FOREIGN KEY (user_id) REFERENCES users(id),
        FOREIGN KEY (config_id) REFERENCES configs(id)
      )
    `);

    db.exec(`
      CREATE TABLE IF NOT EXISTS organizations (
        id TEXT PRIMARY KEY,
        user_id TEXT NOT NULL,
        config_id TEXT NOT NULL,
        name TEXT NOT NULL,
        avatar_url TEXT NOT NULL,
        membership_role TEXT NOT NULL DEFAULT 'member',
        is_included INTEGER NOT NULL DEFAULT 1,
        status TEXT NOT NULL DEFAULT 'imported',
        last_mirrored INTEGER,
        error_message TEXT,
        repository_count INTEGER NOT NULL DEFAULT 0,
        created_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
        updated_at INTEGER NOT NULL DEFAULT (strftime('%s','now')),
        FOREIGN KEY (user_id) REFERENCES users(id),
        FOREIGN KEY (config_id) REFERENCES configs(id)
      )
    `);

    db.exec(`
      CREATE TABLE IF NOT EXISTS mirror_jobs (
        id TEXT PRIMARY KEY,
        user_id TEXT NOT NULL,
        repository_id TEXT,
        repository_name TEXT,
        organization_id TEXT,
        organization_name TEXT,
        details TEXT,
        status TEXT NOT NULL DEFAULT 'imported',
        message TEXT NOT NULL,
        timestamp TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id)
      )
    `);

    // Insert default config if none exists
    const configCountResult = db.query(`SELECT COUNT(*) as count FROM configs`).get();
    const configCount = configCountResult?.count || 0;

    if (configCount === 0) {
      // Get the first user
      const firstUserResult = db.query(`SELECT id FROM users LIMIT 1`).get();

      if (firstUserResult) {
        const userId = firstUserResult.id;
        const configId = uuidv4();
        const githubConfig = JSON.stringify({
          username: process.env.GITHUB_USERNAME || "",
          token: process.env.GITHUB_TOKEN || "",
          skipForks: false,
          privateRepositories: false,
          mirrorIssues: false,
          mirrorStarred: true,
          useSpecificUser: false,
          preserveOrgStructure: true,
          skipStarredIssues: false,
        });
        const giteaConfig = JSON.stringify({
          url: process.env.GITEA_URL || "",
          token: process.env.GITEA_TOKEN || "",
          username: process.env.GITEA_USERNAME || "",
          organization: "",
          visibility: "public",
          starredReposOrg: "github",
        });
        const include = JSON.stringify(["*"]);
        const exclude = JSON.stringify([]);
        const scheduleConfig = JSON.stringify({
          enabled: false,
          interval: 3600,
          lastRun: null,
          nextRun: null,
        });

        const stmt = db.prepare(`
          INSERT INTO configs (id, user_id, name, is_active, github_config, gitea_config, include, exclude, schedule_config, created_at, updated_at)
          VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        `);

        stmt.run(
          configId,
          userId,
          "Default Configuration",
          1,
          githubConfig,
          giteaConfig,
          include,
          exclude,
          scheduleConfig,
          Date.now(),
          Date.now()
        );
      }
    }

    console.log("✅ Database initialization completed successfully.");
  } catch (error) {
    console.error("❌ Error initializing database:", error);
    process.exit(1);
  }
}

/**
 * Reset users in the database
 */
async function resetUsers() {
  console.log(`Resetting users in database at ${dbPath}...`);

  try {
    // Check if the database exists
    const doesDbExist = fs.existsSync(dbPath);

    if (!doesDbExist) {
      console.log(
        "❌ Database file doesn't exist. Run 'bun run manage-db init' first to create it."
      );
      return;
    }

    const db = new Database(dbPath);

    // Count existing users
    const userCountResult = db.query(`SELECT COUNT(*) as count FROM users`).get();
    const userCount = userCountResult?.count || 0;

    if (userCount === 0) {
      console.log("ℹ️  No users found in the database. Nothing to reset.");
      return;
    }

    // Delete all users
    db.exec(`DELETE FROM users`);
    console.log(`✅ Deleted ${userCount} users from the database.`);

    // Check dependent configurations that need to be removed
    const configCountResult = db.query(`SELECT COUNT(*) as count FROM configs`).get();
    const configCount = configCountResult?.count || 0;

    if (configCount > 0) {
      db.exec(`DELETE FROM configs`);
      console.log(`✅ Deleted ${configCount} configurations.`);
    }

    // Check for dependent repositories
    const repoCountResult = db.query(`SELECT COUNT(*) as count FROM repositories`).get();
    const repoCount = repoCountResult?.count || 0;

    if (repoCount > 0) {
      db.exec(`DELETE FROM repositories`);
      console.log(`✅ Deleted ${repoCount} repositories.`);
    }

    // Check for dependent organizations
    const orgCountResult = db.query(`SELECT COUNT(*) as count FROM organizations`).get();
    const orgCount = orgCountResult?.count || 0;

    if (orgCount > 0) {
      db.exec(`DELETE FROM organizations`);
      console.log(`✅ Deleted ${orgCount} organizations.`);
    }

    // Check for dependent mirror jobs
    const jobCountResult = db.query(`SELECT COUNT(*) as count FROM mirror_jobs`).get();
    const jobCount = jobCountResult?.count || 0;

    if (jobCount > 0) {
      db.exec(`DELETE FROM mirror_jobs`);
      console.log(`✅ Deleted ${jobCount} mirror jobs.`);
    }

    console.log(
      "✅ Database has been reset. The application will now prompt for a new admin account setup on next run."
    );
  } catch (error) {
    console.error("❌ Error resetting users:", error);
    process.exit(1);
  }
}

/**
 * Fix database location issues
 */
async function fixDatabaseIssues() {
  console.log("Checking for database issues...");

  // Check for database files in the root directory
  if (fs.existsSync(rootDbFile)) {
    console.log("Found database file in root directory: gitea-mirror.db");

    // If the data directory doesn't have the file, move it there
    if (!fs.existsSync(dataDbFile)) {
      console.log("Moving database file to data directory...");
      fs.copyFileSync(rootDbFile, dataDbFile);
      console.log("Database file moved successfully.");
    } else {
      console.log(
        "Database file already exists in data directory. Checking for differences..."
      );

      // Compare file sizes to see which is newer/larger
      const rootStats = fs.statSync(rootDbFile);
      const dataStats = fs.statSync(dataDbFile);

      if (
        rootStats.size > dataStats.size ||
        rootStats.mtime > dataStats.mtime
      ) {
        console.log(
          "Root database file is newer or larger. Backing up data directory file and replacing it..."
        );
        fs.copyFileSync(dataDbFile, `${dataDbFile}.backup-${Date.now()}`);
        fs.copyFileSync(rootDbFile, dataDbFile);
        console.log("Database file replaced successfully.");
      }
    }

    // Remove the root file
    console.log("Removing database file from root directory...");
    fs.unlinkSync(rootDbFile);
    console.log("Root database file removed.");
  }

  // Do the same for dev database
  if (fs.existsSync(rootDevDbFile)) {
    console.log(
      "Found development database file in root directory: gitea-mirror-dev.db"
    );

    // If the data directory doesn't have the file, move it there
    if (!fs.existsSync(dataDevDbFile)) {
      console.log("Moving development database file to data directory...");
      fs.copyFileSync(rootDevDbFile, dataDevDbFile);
      console.log("Development database file moved successfully.");
    } else {
      console.log(
        "Development database file already exists in data directory. Checking for differences..."
      );

      // Compare file sizes to see which is newer/larger
      const rootStats = fs.statSync(rootDevDbFile);
      const dataStats = fs.statSync(dataDevDbFile);

      if (
        rootStats.size > dataStats.size ||
        rootStats.mtime > dataStats.mtime
      ) {
        console.log(
          "Root development database file is newer or larger. Backing up data directory file and replacing it..."
        );
        fs.copyFileSync(dataDevDbFile, `${dataDevDbFile}.backup-${Date.now()}`);
        fs.copyFileSync(rootDevDbFile, dataDevDbFile);
        console.log("Development database file replaced successfully.");
      }
    }

    // Remove the root file
    console.log("Removing development database file from root directory...");
    fs.unlinkSync(rootDevDbFile);
    console.log("Root development database file removed.");
  }

  // Check if database files exist in the data directory
  if (!fs.existsSync(dataDbFile)) {
    console.warn(
      "⚠️  WARNING: Production database file not found in data directory."
    );
    console.warn('Run "bun run manage-db init" to create it.');
  } else {
    console.log("✅ Production database file found in data directory.");

    // Check if we can connect to the database
    try {
      // Try to query the database
      const db = new Database(dbPath);
      db.query(`SELECT 1 FROM sqlite_master LIMIT 1`).get();
      console.log(`✅ Successfully connected to the database.`);
    } catch (error) {
      console.error("❌ Error connecting to the database:", error);
      console.warn(
        'The database file might be corrupted. Consider running "bun run manage-db init" to recreate it.'
      );
    }
  }

  console.log("Database check completed.");
}

/**
 * Main function to handle the command
 */
async function main() {
  console.log(`Database Management Tool for Gitea Mirror`);

  // Ensure all required tables exist
  console.log("Ensuring all required tables exist...");
  await ensureTablesExist();

  switch (command) {
    case "check":
      await checkDatabase();
      break;
    case "init":
      await initializeDatabase();
      break;
    case "fix":
      await fixDatabaseIssues();
      break;
    case "reset-users":
      await resetUsers();
      break;
    case "auto":
      // Auto mode: check, fix, and initialize if needed
      console.log("Running in auto mode: check, fix, and initialize if needed");
      await fixDatabaseIssues();

      if (!fs.existsSync(dataDbFile)) {
        await initializeDatabase();
      } else {
        await checkDatabase();
      }
      break;
    default:
      console.log(`
Available commands:
  check        - Check database status
  init         - Initialize the database (only if it doesn't exist)
  fix          - Fix database location issues
  reset-users  - Remove all users and their data
  auto         - Automatic mode: check, fix, and initialize if needed

Usage: bun run manage-db [command]
`);
  }
}

main().catch((error) => {
  console.error("Error during database management:", error);
  process.exit(1);
});