import sqlite3 from 'sqlite3';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';
import dotenv from 'dotenv';

dotenv.config();

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const dbPath = process.env.DATABASE_PATH || join(__dirname, '..', 'database.sqlite');

const db = new sqlite3.Database(dbPath, (err) => {
  if (err) {
    console.error('Error opening database:', err.message);
  } else {
    console.log('Connected to SQLite database');
    initDatabase();
  }
});

function initDatabase() {
  db.serialize(() => {
    // Users table
    db.run(`
      CREATE TABLE IF NOT EXISTS users (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        username TEXT UNIQUE NOT NULL,
        email TEXT UNIQUE NOT NULL,
        password_hash TEXT NOT NULL,
        theme TEXT DEFAULT 'light',
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Collections table (with nested support)
    db.run(`
      CREATE TABLE IF NOT EXISTS collections (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT NOT NULL,
        description TEXT,
        parent_id INTEGER,
        user_id INTEGER,
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id),
        FOREIGN KEY (parent_id) REFERENCES collections(id) ON DELETE CASCADE
      )
    `);

    // Tags table
    db.run(`
      CREATE TABLE IF NOT EXISTS tags (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT UNIQUE NOT NULL,
        color TEXT DEFAULT '#6c757d'
      )
    `);

    // Models table
    db.run(`
      CREATE TABLE IF NOT EXISTS models (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT NOT NULL,
        description TEXT,
        file_path TEXT NOT NULL,
        file_name TEXT NOT NULL,
        file_size INTEGER,
        file_type TEXT,
        preview_image TEXT,
        creator TEXT,
        source_url TEXT,
        notes TEXT,
        is_supported BOOLEAN DEFAULT 0,
        license TEXT DEFAULT 'Unknown',
        user_id INTEGER,
        collection_id INTEGER,
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id),
        FOREIGN KEY (collection_id) REFERENCES collections(id)
      )
    `);

    // Model tags junction table
    db.run(`
      CREATE TABLE IF NOT EXISTS model_tags (
        model_id INTEGER,
        tag_id INTEGER,
        PRIMARY KEY (model_id, tag_id),
        FOREIGN KEY (model_id) REFERENCES models(id) ON DELETE CASCADE,
        FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE
      )
    `);

    // Model files table (for multi-file models)
    db.run(`
      CREATE TABLE IF NOT EXISTS model_files (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        model_id INTEGER,
        file_path TEXT NOT NULL,
        file_name TEXT NOT NULL,
        file_size INTEGER,
        file_type TEXT,
        is_primary BOOLEAN DEFAULT 0,
        FOREIGN KEY (model_id) REFERENCES models(id) ON DELETE CASCADE
      )
    `);

    // Print queue table
    db.run(`
      CREATE TABLE IF NOT EXISTS print_queue (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        model_id INTEGER,
        user_id INTEGER,
        priority INTEGER DEFAULT 0,
        status TEXT DEFAULT 'pending',
        notes TEXT,
        added_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        completed_at DATETIME,
        FOREIGN KEY (model_id) REFERENCES models(id) ON DELETE CASCADE,
        FOREIGN KEY (user_id) REFERENCES users(id)
      )
    `);

    // Printer settings table
    db.run(`
      CREATE TABLE IF NOT EXISTS printer_settings (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        user_id INTEGER,
        printer_type TEXT,
        printer_name TEXT,
        access_token TEXT,
        serial_number TEXT,
        model_name TEXT,
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
      )
    `);

    // Migration: Add is_primary column to model_files if it doesn't exist
    db.all("PRAGMA table_info(model_files)", [], (err, columns) => {
      if (err) {
        console.error('Error checking model_files schema:', err);
        return;
      }

      const hasIsPrimary = columns.some(col => col.name === 'is_primary');
      if (!hasIsPrimary) {
        db.run('ALTER TABLE model_files ADD COLUMN is_primary BOOLEAN DEFAULT 0', (err) => {
          if (err) {
            console.error('Error adding is_primary column:', err);
          } else {
            console.log('Added is_primary column to model_files table');
          }
        });
      }
    });

    // Migration: Add parent_id column to collections if it doesn't exist
    db.all("PRAGMA table_info(collections)", [], (err, columns) => {
      if (err) {
        console.error('Error checking collections schema:', err);
        return;
      }

      const hasParentId = columns.some(col => col.name === 'parent_id');
      if (!hasParentId) {
        db.run('ALTER TABLE collections ADD COLUMN parent_id INTEGER REFERENCES collections(id) ON DELETE CASCADE', (err) => {
          if (err) {
            console.error('Error adding parent_id column:', err);
          } else {
            console.log('Added parent_id column to collections table');
          }
        });
      }
    });

    // Migration: Add license column to models if it doesn't exist
    db.all("PRAGMA table_info(models)", [], (err, columns) => {
      if (err) {
        console.error('Error checking models schema:', err);
        return;
      }

      const hasLicense = columns.some(col => col.name === 'license');
      if (!hasLicense) {
        db.run('ALTER TABLE models ADD COLUMN license TEXT DEFAULT \'Unknown\'', (err) => {
          if (err) {
            console.error('Error adding license column:', err);
          } else {
            console.log('Added license column to models table');
          }
        });
      }
    });

    // Migration: Add theme column to users if it doesn't exist
    db.all("PRAGMA table_info(users)", [], (err, columns) => {
      if (err) {
        console.error('Error checking users schema:', err);
        return;
      }

      const hasTheme = columns.some(col => col.name === 'theme');
      if (!hasTheme) {
        db.run('ALTER TABLE users ADD COLUMN theme TEXT DEFAULT \'light\'', (err) => {
          if (err) {
            console.error('Error adding theme column:', err);
          } else {
            console.log('Added theme column to users table');
          }
        });
      }
    });

    // Migration: Add print specifications columns to print_queue if they don't exist
    db.all("PRAGMA table_info(print_queue)", [], (err, columns) => {
      if (err) {
        console.error('Error checking print_queue schema:', err);
        return;
      }

      const newColumns = {
        quantity: 'INTEGER DEFAULT 1',
        filament_type: 'TEXT',
        color: 'TEXT',
        print_temp: 'INTEGER',
        bed_temp: 'INTEGER',
        print_speed: 'TEXT DEFAULT \'normal\'',
        support_structure: 'TEXT DEFAULT \'none\'',
        infill_density: 'INTEGER DEFAULT 20',
        layer_height: 'REAL DEFAULT 0.2',
        special_instructions: 'TEXT'
      };

      Object.entries(newColumns).forEach(([colName, colDef]) => {
        const hasColumn = columns.some(col => col.name === colName);
        if (!hasColumn) {
          db.run(`ALTER TABLE print_queue ADD COLUMN ${colName} ${colDef}`, (err) => {
            if (err) {
              console.error(`Error adding ${colName} column:`, err);
            } else {
              console.log(`Added ${colName} column to print_queue table`);
            }
          });
        }
      });
    });

    console.log('Database tables initialized');
  });
}

export default db;