import { QueryInterface, DataTypes } from 'sequelize';

/**
 * Migration to create admin_configurations table
 * Stores system-wide configuration settings
 */
export async function up(queryInterface: QueryInterface): Promise<void> {
  await queryInterface.createTable('admin_configurations', {
    config_id: {
      type: DataTypes.UUID,
      defaultValue: DataTypes.UUIDV4,
      primaryKey: true
    },
    config_key: {
      type: DataTypes.STRING(100),
      allowNull: false,
      unique: true,
      comment: 'Unique configuration key (e.g., "DEFAULT_TAT_EXPRESS", "MAX_FILE_SIZE")'
    },
    config_category: {
      type: DataTypes.ENUM(
        'TAT_SETTINGS',
        'NOTIFICATION_RULES',
        'DOCUMENT_POLICY',
        'USER_ROLES',
        'DASHBOARD_LAYOUT',
        'AI_CONFIGURATION',
        'WORKFLOW_SHARING',
        'SYSTEM_SETTINGS'
      ),
      allowNull: false,
      comment: 'Category of the configuration'
    },
    config_value: {
      type: DataTypes.TEXT,
      allowNull: false,
      comment: 'Configuration value (can be JSON string for complex values)'
    },
    value_type: {
      type: DataTypes.ENUM('STRING', 'NUMBER', 'BOOLEAN', 'JSON', 'ARRAY'),
      defaultValue: 'STRING',
      comment: 'Data type of the value'
    },
    display_name: {
      type: DataTypes.STRING(200),
      allowNull: false,
      comment: 'Human-readable name for UI display'
    },
    description: {
      type: DataTypes.TEXT,
      allowNull: true,
      comment: 'Description of what this configuration does'
    },
    default_value: {
      type: DataTypes.TEXT,
      allowNull: true,
      comment: 'Default value if reset'
    },
    is_editable: {
      type: DataTypes.BOOLEAN,
      defaultValue: true,
      comment: 'Whether this config can be edited by admin'
    },
    is_sensitive: {
      type: DataTypes.BOOLEAN,
      defaultValue: false,
      comment: 'Whether this contains sensitive data (e.g., API keys)'
    },
    validation_rules: {
      type: DataTypes.JSONB,
      defaultValue: {},
      comment: 'Validation rules (min, max, regex, etc.)'
    },
    ui_component: {
      type: DataTypes.STRING(50),
      allowNull: true,
      comment: 'UI component type (input, select, toggle, slider, etc.)'
    },
    options: {
      type: DataTypes.JSONB,
      allowNull: true,
      comment: 'Options for select/radio inputs'
    },
    sort_order: {
      type: DataTypes.INTEGER,
      defaultValue: 0,
      comment: 'Display order in admin panel'
    },
    requires_restart: {
      type: DataTypes.BOOLEAN,
      defaultValue: false,
      comment: 'Whether changing this requires server restart'
    },
    last_modified_by: {
      type: DataTypes.UUID,
      allowNull: true,
      references: {
        model: 'users',
        key: 'user_id'
      },
      comment: 'Admin who last modified this'
    },
    last_modified_at: {
      type: DataTypes.DATE,
      allowNull: true,
      comment: 'When this was last modified'
    },
    created_at: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: DataTypes.NOW
    },
    updated_at: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: DataTypes.NOW
    }
  });

  // Indexes (with IF NOT EXISTS)
  await queryInterface.sequelize.query('CREATE INDEX IF NOT EXISTS "admin_configurations_config_category" ON "admin_configurations" ("config_category");');
  await queryInterface.sequelize.query('CREATE INDEX IF NOT EXISTS "admin_configurations_is_editable" ON "admin_configurations" ("is_editable");');
  await queryInterface.sequelize.query('CREATE INDEX IF NOT EXISTS "admin_configurations_sort_order" ON "admin_configurations" ("sort_order");');

  // Admin config table created
}

export async function down(queryInterface: QueryInterface): Promise<void> {
  await queryInterface.dropTable('admin_configurations');
  await queryInterface.sequelize.query('DROP TYPE IF EXISTS "enum_admin_configurations_config_category";');
  await queryInterface.sequelize.query('DROP TYPE IF EXISTS "enum_admin_configurations_value_type";');
  // Admin config table dropped
}