/***********************************************************************************************************************************************************************
 * File Name: task_completion.mdl.js
 * Type of Program: Model
 * Description: Sequelize models for `task_completions` and `task_completion_files`.
 *              A completion is created when a user turns in work for a task.
 *              Multiple completions are allowed (resubmit anytime).
 *              Files are stored separately — one completion can have many files.
 *
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 13, 2026
 ***********************************************************************************************************************************************************************/
const { DataTypes } = require('sequelize');
const sequelize = require('../../config/db.config');
const mdl_Users = require('../users/users.mdl');
const { Task } = require('./task.mdl');

// ─── TaskCompletion ────────────────────────────────────────────────────────────
const TaskCompletion = sequelize.define('TaskCompletion', {
    completion_id: {
        type: DataTypes.UUID,
        defaultValue: DataTypes.UUIDV4,
        primaryKey: true,
        order: 3,
    },
    task_id: {
        type: DataTypes.UUID,
        allowNull: false,
        references: { model: 'tasks', key: 'task_id' },
        onDelete: 'CASCADE',
        order: 4,
    },
    user_id: {
        type: DataTypes.BIGINT,
        allowNull: false,
        references: { model: 'users', key: 'user_id' },
        onDelete: 'CASCADE',
        order: 5,
    },
    note: {
        type: DataTypes.TEXT,
        allowNull: true,
        comment: 'Optional note the user attaches when submitting.',
        order: 1,
    },
    submitted_at: {
        type: DataTypes.DATE,
        defaultValue: DataTypes.NOW,
        allowNull: false,
        order: 2,
    },
 
    // ── Audit trails ────────────────────────────────────────────────────────
    createdBy: { type: DataTypes.BIGINT, allowNull: true, order: 6 },
    updatedBy: { type: DataTypes.BIGINT, allowNull: true, order: 7 },
    deletedBy: { type: DataTypes.BIGINT, allowNull: true, order: 8 },
}, {
    tableName: 'task_completions',
    paranoid: true,
    timestamps: true,
    indexes: [
        { fields: ['task_id'], name: 'idx_tc_task_id' },
        { fields: ['user_id'], name: 'idx_tc_user_id' },
        { fields: ['task_id', 'user_id'], name: 'idx_tc_task_user' },
    ],
});

// ─── TaskCompletionFile ────────────────────────────────────────────────────────
const TaskCompletionFile = sequelize.define('TaskCompletionFile', {
    file_id: {
        type: DataTypes.UUID,
        defaultValue: DataTypes.UUIDV4,
        primaryKey: true,
    },
    completion_id: {
        type: DataTypes.UUID,
        allowNull: false,
        references: { model: 'task_completions', key: 'completion_id' },
        onDelete: 'CASCADE',
    },
    file_url: {
        type: DataTypes.STRING,
        allowNull: false,
        comment: 'Storage path or CDN URL of the uploaded file.',
    },
    file_name: {
        type: DataTypes.STRING,
        allowNull: false,
        comment: 'Original filename as uploaded by the user.',
    },
    file_size: {
        type: DataTypes.INTEGER,
        allowNull: true,
        comment: 'File size in bytes.',
    },
    mime_type: {
        type: DataTypes.STRING,
        allowNull: true,
        comment: 'MIME type e.g. application/pdf, image/png.',
    },
    storage_key: {
        type: DataTypes.STRING(500),
        allowNull: true,
        comment: 'S3 object key (e.g. "images/uuid.jpg"), used by the download proxy endpoint.',
    },

    // ── Audit trails ────────────────────────────────────────────────────────
    createdBy: { type: DataTypes.BIGINT, allowNull: true },
    updatedBy: { type: DataTypes.BIGINT, allowNull: true },
    deletedBy: { type: DataTypes.BIGINT, allowNull: true },
}, {
    tableName: 'task_completion_files',
    paranoid: true,
    timestamps: true,
    indexes: [
        { fields: ['completion_id'], name: 'idx_tcf_completion_id' },
    ],
});

// ─── Associations ──────────────────────────────────────────────────────────────
Task.hasMany(TaskCompletion, { foreignKey: 'task_id', as: 'completions' });
TaskCompletion.belongsTo(Task, { foreignKey: 'task_id', as: 'task' });

mdl_Users.hasMany(TaskCompletion, { foreignKey: 'user_id', as: 'taskCompletions' });
TaskCompletion.belongsTo(mdl_Users, { foreignKey: 'user_id', as: 'user' });

TaskCompletion.hasMany(TaskCompletionFile, { foreignKey: 'completion_id', as: 'files' });
TaskCompletionFile.belongsTo(TaskCompletion, { foreignKey: 'completion_id', as: 'completion' });

module.exports = { TaskCompletion, TaskCompletionFile };