/***********************************************************************************************************************************************************************
 * File Name: completion_requirement_progress.mdl.js
 * Type of Program: Model
 * Description: Per-user tracking state for a CompletionRequirement, for the requirement types that need
 *              genuinely new storage (watch_percent's running progress_percent, watch_video/listen_audio's
 *              per-block progress_percent map, and manual_complete's completed flag — pass_quiz reads
 *              QuizAttempt.passed directly, and read_all_content reads CourseReadingProgress directly;
 *              neither needs a row here).
 *
 *   CompletionRequirementProgress — UPSERT key: (requirement_id, user_id).
 *
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jul. 14, 2026
 ***********************************************************************************************************************************************************************/
const { DataTypes } = require('sequelize');
const sequelize = require('../../config/db.config');

const CompletionRequirementProgress = sequelize.define('CompletionRequirementProgress', {
    progress_id: {
        type: DataTypes.UUID,
        defaultValue: DataTypes.UUIDV4,
        primaryKey: true,
    },
    requirement_id: {
        type: DataTypes.UUID,
        allowNull: false,
        references: { model: 'completion_requirements', key: 'requirement_id' },
        onDelete: 'CASCADE',
    },
    user_id: {
        type: DataTypes.BIGINT,
        allowNull: false,
        references: { model: 'users', key: 'user_id' },
        onDelete: 'CASCADE',
    },
    entity_type: {
        type: DataTypes.ENUM('course', 'unit', 'lesson'),
        allowNull: false,
        comment: 'Denormalized from the requirement row to avoid a join on every read.',
    },
    entity_id: {
        type: DataTypes.BIGINT,
        allowNull: false,
        comment: 'Denormalized from the requirement row.',
    },
    progress_percent: {
        type: DataTypes.INTEGER,
        allowNull: true,
        comment: 'watch_percent only — running max % watched.',
    },
    block_progress: {
        type: DataTypes.JSONB,
        allowNull: true,
        comment: 'watch_percent/watch_video/listen_audio — { [block_id]: { percent, updatedAt } } running max + last-sample timestamp per block. The timestamp lets recordWatchProgress validate a reported percent against real elapsed wall-clock time (anti-skip). watch_video/listen_audio: completed once every current block of that type is at 100. watch_percent: also keeps progress_percent as its aggregate max across whichever block reports.',
    },
    completed: {
        type: DataTypes.BOOLEAN,
        allowNull: false,
        defaultValue: false,
    },
    completed_at: {
        type: DataTypes.DATE,
        allowNull: true,
    },

    // ── Audit trails ────────────────────────────────────────────────────────
    createdBy: { type: DataTypes.BIGINT, allowNull: true },
    updatedBy: { type: DataTypes.BIGINT, allowNull: true },
}, {
    tableName: 'completion_requirement_progress',
    timestamps: true,
    paranoid: false, // progress rows are never soft-deleted, matches CourseReadingProgress
    indexes: [
        {
            unique: true,
            fields: ['requirement_id', 'user_id'],
            name: 'uq_crp2_requirement_user',
        },
        { fields: ['user_id'], name: 'idx_crp2_user_id' },
        { fields: ['entity_type', 'entity_id'], name: 'idx_crp2_entity_type_entity_id' },
    ],
});

module.exports = CompletionRequirementProgress;