const { DataTypes } = require('sequelize');
const { sequelize } = require('../config/database');

/**
 * Story Model
 * Table: stories
 * Stores story data with metadata, vocabulary, context, grades, and tags
 */
const Story = sequelize.define('stories', {
  id: {
    type: DataTypes.UUID,
    defaultValue: DataTypes.UUIDV4,
    primaryKey: true,
    allowNull: false,
    comment: 'Unique identifier for the story (UUID)'
  },
  name: {
    type: DataTypes.STRING(255),
    allowNull: false,
    comment: 'Story title/name'
  },
  thumbnail: {
    type: DataTypes.TEXT,
    allowNull: true,
    comment: 'URL to story thumbnail image'
  },
  logo: {
    type: DataTypes.TEXT,
    allowNull: true,
    comment: 'URL to story logo/thumbnail image'
  },
  vocabulary: {
    type: DataTypes.JSON,
    allowNull: true,
    defaultValue: [],
    comment: 'Array of vocabulary words used in the story'
  },
  context: {
    type: DataTypes.JSON,
    allowNull: true,
    defaultValue: [],
    comment: 'Array of story context objects with images, text, audio data'
  },
  type: {
    type: DataTypes.TEXT,
    allowNull: false,
    defaultValue: 'story',
    comment: 'Type of media content'
  },
  grade: {
    type: DataTypes.JSON,
    allowNull: true,
    defaultValue: [],
    comment: 'Array of grade levels (e.g., ["Grade 1", "Grade 2"])'
  },
  grade_number: {
    type: DataTypes.INTEGER,
    allowNull: true,
    defaultValue: 0,
    comment: 'Numeric representation of grade unit lesson as GG UU LL'
  },
  tag: {
    type: DataTypes.JSON,
    allowNull: true,
    defaultValue: [],
    comment: 'Array of tags for categorization (e.g., ["adventure", "friendship"])'
  },
  created_at: {
    type: DataTypes.DATE,
    allowNull: false,
    defaultValue: DataTypes.NOW,
    comment: 'Record creation timestamp'
  },
  updated_at: {
    type: DataTypes.DATE,
    allowNull: false,
    defaultValue: DataTypes.NOW,
    comment: 'Record last update timestamp'
  }
}, {
  tableName: 'stories',
  timestamps: true,
  underscored: true,
  indexes: [
    {
      name: 'idx_name',
      fields: ['name']
    },
    {
      name: 'idx_created_at',
      fields: ['created_at']
    }
  ],
  charset: 'utf8mb4',
  collate: 'utf8mb4_unicode_ci'
});

module.exports = Story;