/**
 * Database connection and models for Data Retention Service
 */

const { Sequelize, DataTypes } = require('sequelize');

let sequelize;
let models = {};

/**
 * Initialize database connection
 */
async function initializeDatabase() {
  // Database connection
  sequelize = new Sequelize(
    process.env.DB_NAME || 'drone_detection',
    process.env.DB_USER || 'postgres',
    process.env.DB_PASSWORD || 'password',
    {
      host: process.env.DB_HOST || 'localhost',
      port: process.env.DB_PORT || 5432,
      dialect: 'postgres',
      logging: process.env.NODE_ENV === 'development' ? console.log : false,
      pool: {
        max: 5,
        min: 0,
        acquire: 30000,
        idle: 10000
      }
    }
  );

  // Test connection
  await sequelize.authenticate();
  
  // Define models
  defineModels();
  
  return sequelize;
}

/**
 * Define database models
 */
function defineModels() {
  // Tenant model
  models.Tenant = sequelize.define('Tenant', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    slug: {
      type: DataTypes.STRING(50),
      unique: true,
      allowNull: false
    },
    name: {
      type: DataTypes.STRING(100),
      allowNull: false
    },
    features: {
      type: DataTypes.JSONB,
      defaultValue: {}
    },
    is_active: {
      type: DataTypes.BOOLEAN,
      defaultValue: true
    }
  }, {
    tableName: 'tenants',
    timestamps: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at'
  });

  // DroneDetection model
  models.DroneDetection = sequelize.define('DroneDetection', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    tenant_id: {
      type: DataTypes.INTEGER,
      allowNull: false
    },
    device_id: {
      type: DataTypes.STRING(50),
      allowNull: false
    },
    timestamp: {
      type: DataTypes.DATE,
      allowNull: false
    },
    drone_type: {
      type: DataTypes.INTEGER,
      allowNull: true
    },
    rssi: {
      type: DataTypes.FLOAT,
      allowNull: true
    },
    frequency: {
      type: DataTypes.FLOAT,
      allowNull: true
    }
  }, {
    tableName: 'drone_detections',
    timestamps: false,
    indexes: [
      {
        fields: ['tenant_id', 'timestamp']
      },
      {
        fields: ['timestamp']
      }
    ]
  });

  // Heartbeat model
  models.Heartbeat = sequelize.define('Heartbeat', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    tenant_id: {
      type: DataTypes.INTEGER,
      allowNull: false
    },
    device_id: {
      type: DataTypes.STRING(50),
      allowNull: false
    },
    timestamp: {
      type: DataTypes.DATE,
      allowNull: false
    },
    status: {
      type: DataTypes.STRING(20),
      defaultValue: 'online'
    }
  }, {
    tableName: 'heartbeats',
    timestamps: false,
    indexes: [
      {
        fields: ['tenant_id', 'timestamp']
      },
      {
        fields: ['timestamp']
      }
    ]
  });

  // SecurityLog model (optional, might not exist in all installations)
  models.SecurityLog = sequelize.define('SecurityLog', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    tenant_id: {
      type: DataTypes.INTEGER,
      allowNull: true
    },
    timestamp: {
      type: DataTypes.DATE,
      allowNull: false
    },
    level: {
      type: DataTypes.STRING(20),
      allowNull: false
    },
    message: {
      type: DataTypes.TEXT,
      allowNull: false
    },
    metadata: {
      type: DataTypes.JSONB,
      defaultValue: {}
    }
  }, {
    tableName: 'security_logs',
    timestamps: false,
    indexes: [
      {
        fields: ['tenant_id', 'timestamp']
      },
      {
        fields: ['timestamp']
      }
    ]
  });
}

/**
 * Get models
 */
async function getModels() {
  if (!sequelize) {
    await initializeDatabase();
  }
  return models;
}

/**
 * Close database connection
 */
async function closeDatabase() {
  if (sequelize) {
    await sequelize.close();
  }
}

module.exports = {
  initializeDatabase,
  getModels,
  closeDatabase,
  sequelize: () => sequelize
};