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import { Schema, model, Document, Types } from 'mongoose';

// Field types supported in forms
type FieldType =
  | 'short_text'
  | 'long_text'
  | 'multiple_choice'
  | 'checkboxes'
  | 'dropdown'
  | 'linear_scale'
  | 'date'
  | 'time'
  | 'email'
  | 'phone'
  | 'number'
  | 'file_upload';

interface IFormField {
  id: string; // Unique field ID
  type: FieldType;
  label: string;
  description?: string;
  required: boolean;
  options?: string[]; // For multiple_choice, checkboxes, dropdown
  validation?: {
    min?: number; // For number, linear_scale
    max?: number;
    pattern?: string; // For text fields (regex)
    maxLength?: number;
    minLength?: number;
    fileTypes?: string[]; // For file uploads
    maxFileSize?: number; // In bytes
  };
  order: number; // Display order
}

export interface IForm extends Document {
  // Basic Info
  title: string;
  description?: string;

  // Association
  event?: Types.ObjectId; // If attached to an event
  organization: Types.ObjectId; // Template forms belong to organization
  createdBy: Types.ObjectId; // Trainer who created it

  // Form Structure
  fields: IFormField[];

  // Access Control
  accessType: 'event_attendees' | 'verified_users' | 'public'; // Who can submit
  restrictToAttendees: boolean; // Only event participants can submit
  oneResponsePerUser: boolean; // Enforce single response

  // Sharing
  shortCode: string; // Short join code (e.g., FORM-ABC123)
  shareToken: string; // Secret token for share links
  qrCode?: string; // QR code image URL/data

  // Settings
  acceptingResponses: boolean;
  showResponseSummary: boolean; // Show summary to respondents
  allowEditing: boolean; // Allow users to edit their responses

  // Metadata
  responseCount: number;
  status: 'draft' | 'active' | 'closed';

  createdAt: Date;
  updatedAt: Date;
}

const FormSchema = new Schema<IForm>({
  title: {
    type: String,
    required: true,
    trim: true,
    index: 'text'
  },

  description: {
    type: String,
    trim: true
  },

  event: {
    type: Schema.Types.ObjectId,
    ref: 'Event',
    index: true
  },

  organization: {
    type: Schema.Types.ObjectId,
    ref: 'User',
    required: false,
    index: true
  },

  createdBy: {
    type: Schema.Types.ObjectId,
    ref: 'User',
    required: true,
    index: true
  },

  fields: [{
    id: {
      type: String,
      required: true
    },
    type: {
      type: String,
      enum: [
        'short_text',
        'long_text',
        'multiple_choice',
        'checkboxes',
        'dropdown',
        'linear_scale',
        'date',
        'time',
        'email',
        'phone',
        'number',
        'file_upload'
      ],
      required: true
    },
    label: {
      type: String,
      required: true
    },
    description: String,
    required: {
      type: Boolean,
      default: false
    },
    options: [String],
    validation: {
      min: Number,
      max: Number,
      pattern: String,
      maxLength: Number,
      minLength: Number,
      fileTypes: [String],
      maxFileSize: Number
    },
    order: {
      type: Number,
      required: true
    }
  }],

  accessType: {
    type: String,
    enum: ['event_attendees', 'verified_users', 'public'],
    default: 'verified_users'
  },

  restrictToAttendees: {
    type: Boolean,
    default: false
  },

  oneResponsePerUser: {
    type: Boolean,
    default: true
  },

  shortCode: {
    type: String,
    required: true,
    unique: true,
    uppercase: true,
    trim: true,
    index: true
  },

  shareToken: {
    type: String,
    required: true,
    index: true
  },

  qrCode: String,

  acceptingResponses: {
    type: Boolean,
    default: true
  },

  showResponseSummary: {
    type: Boolean,
    default: false
  },

  allowEditing: {
    type: Boolean,
    default: false
  },

  responseCount: {
    type: Number,
    default: 0
  },

  status: {
    type: String,
    enum: ['draft', 'active', 'closed'],
    default: 'draft',
    index: true
  }
}, {
  timestamps: true
});

// Indexes
FormSchema.index({ event: 1, status: 1 });
FormSchema.index({ organization: 1, createdBy: 1 });
FormSchema.index({ shortCode: 1, shareToken: 1 });

export default model<IForm>('Form', FormSchema);