import { DataTypes, Model, Optional } from 'sequelize';
import { sequelize } from '@config/database';
import { User } from './User';

interface WorkflowTemplateAttributes {
  templateId: string;
  templateName: string;
  templateCode?: string;
  templateDescription?: string;
  templateCategory?: string;
  workflowType?: string;
  approvalLevelsConfig?: any;
  defaultTatHours?: number;
  formStepsConfig?: any;
  userFieldMappings?: any;
  dynamicApproverConfig?: any;
  isActive: boolean;
  isSystemTemplate: boolean;
  usageCount: number;
  createdBy?: string;
  createdAt: Date;
  updatedAt: Date;
}

interface WorkflowTemplateCreationAttributes extends Optional<WorkflowTemplateAttributes, 'templateId' | 'templateCode' | 'templateDescription' | 'templateCategory' | 'workflowType' | 'approvalLevelsConfig' | 'defaultTatHours' | 'formStepsConfig' | 'userFieldMappings' | 'dynamicApproverConfig' | 'createdBy' | 'createdAt' | 'updatedAt'> {}

class WorkflowTemplate extends Model<WorkflowTemplateAttributes, WorkflowTemplateCreationAttributes> implements WorkflowTemplateAttributes {
  public templateId!: string;
  public templateName!: string;
  public templateCode?: string;
  public templateDescription?: string;
  public templateCategory?: string;
  public workflowType?: string;
  public approvalLevelsConfig?: any;
  public defaultTatHours?: number;
  public formStepsConfig?: any;
  public userFieldMappings?: any;
  public dynamicApproverConfig?: any;
  public isActive!: boolean;
  public isSystemTemplate!: boolean;
  public usageCount!: number;
  public createdBy?: string;
  public createdAt!: Date;
  public updatedAt!: Date;

  // Associations
  public creator?: User;
}

WorkflowTemplate.init(
  {
    templateId: {
      type: DataTypes.UUID,
      defaultValue: DataTypes.UUIDV4,
      primaryKey: true,
      field: 'template_id'
    },
    templateName: {
      type: DataTypes.STRING(200),
      allowNull: false,
      field: 'template_name'
    },
    templateCode: {
      type: DataTypes.STRING(50),
      allowNull: true,
      unique: true,
      field: 'template_code'
    },
    templateDescription: {
      type: DataTypes.TEXT,
      allowNull: true,
      field: 'template_description'
    },
    templateCategory: {
      type: DataTypes.STRING(100),
      allowNull: true,
      field: 'template_category'
    },
    workflowType: {
      type: DataTypes.STRING(50),
      allowNull: true,
      field: 'workflow_type'
    },
    approvalLevelsConfig: {
      type: DataTypes.JSONB,
      allowNull: true,
      field: 'approval_levels_config'
    },
    defaultTatHours: {
      type: DataTypes.DECIMAL(10, 2),
      allowNull: true,
      defaultValue: 24,
      field: 'default_tat_hours'
    },
    formStepsConfig: {
      type: DataTypes.JSONB,
      allowNull: true,
      field: 'form_steps_config'
    },
    userFieldMappings: {
      type: DataTypes.JSONB,
      allowNull: true,
      field: 'user_field_mappings'
    },
    dynamicApproverConfig: {
      type: DataTypes.JSONB,
      allowNull: true,
      field: 'dynamic_approver_config'
    },
    isActive: {
      type: DataTypes.BOOLEAN,
      allowNull: false,
      defaultValue: true,
      field: 'is_active'
    },
    isSystemTemplate: {
      type: DataTypes.BOOLEAN,
      allowNull: false,
      defaultValue: false,
      field: 'is_system_template'
    },
    usageCount: {
      type: DataTypes.INTEGER,
      allowNull: false,
      defaultValue: 0,
      field: 'usage_count'
    },
    createdBy: {
      type: DataTypes.UUID,
      allowNull: true,
      field: 'created_by',
      references: {
        model: 'users',
        key: 'user_id'
      }
    },
    createdAt: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: DataTypes.NOW,
      field: 'created_at'
    },
    updatedAt: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: DataTypes.NOW,
      field: 'updated_at'
    }
  },
  {
    sequelize,
    modelName: 'WorkflowTemplate',
    tableName: 'workflow_templates',
    timestamps: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at',
    indexes: [
      {
        unique: true,
        fields: ['template_code']
      },
      {
        fields: ['workflow_type']
      },
      {
        fields: ['is_active']
      }
    ]
  }
);

// Associations
WorkflowTemplate.belongsTo(User, {
  as: 'creator',
  foreignKey: 'createdBy',
  targetKey: 'userId'
});

export { WorkflowTemplate };