// models/courses/associations.js

const { Course, CourseProduct, CourseRole, CourseProductCategory } = require("./courses.mdl");
const Unit = require("./units.mdl");
const Lesson = require("./lessons.mdl");
const LessonPage = require("./lesson_page.mdl");
const CourseObjective = require("./course_objective.mdl");
const LessonObjective = require("./lesson_objective.mdl");
const CoursePrerequisite = require("./course_prerequisite.mdl");
const CourseAssessment = require("./course_assessment.mdl");
const UnitQuiz = require("./unit_quiz.mdl");
const QuizQuestion = require("./quiz_question.mdl");
const QuizOption = require("./quiz_option.mdl");
const mdl_Users = require("../users/users.mdl");

// ── Course ────────────────────────────────────────────────────────────────────
Course.belongsTo(mdl_Users, { as: "creator", foreignKey: "createdBy" });
Course.belongsTo(mdl_Users, { as: "updater", foreignKey: "updatedBy" });
Course.hasMany(Unit, { as: "units", foreignKey: "course_id" });
Course.hasMany(CourseObjective, { as: "objectives", foreignKey: "course_id" });
Course.hasMany(CoursePrerequisite, { as: "prerequisites", foreignKey: "course_id" });
Course.hasOne(CourseAssessment, { as: "assessment", foreignKey: "course_id" });
Course.hasMany(CourseProduct, { as: "products", foreignKey: "course_id" });
Course.hasMany(CourseRole, { as: "roles", foreignKey: "course_id" });
Course.hasMany(CourseProductCategory, { as: "categories", foreignKey: "course_id" });

// ── Unit ──────────────────────────────────────────────────────────────────────
Unit.belongsTo(Course, { as: "course", foreignKey: "course_id" });
Unit.belongsTo(mdl_Users, { as: "creator", foreignKey: "createdBy" });
Unit.belongsTo(mdl_Users, { as: "updater", foreignKey: "updatedBy" });
Unit.hasMany(Lesson, { as: "lessons", foreignKey: "unit_id" });
Unit.hasOne(UnitQuiz, { as: "quiz", foreignKey: "unit_id" });

// ── Lesson ────────────────────────────────────────────────────────────────────
Lesson.belongsTo(Unit, { as: "unit", foreignKey: "unit_id" });
Lesson.belongsTo(mdl_Users, { as: "creator", foreignKey: "createdBy" });
Lesson.belongsTo(mdl_Users, { as: "updater", foreignKey: "updatedBy" });
Lesson.hasOne(LessonPage, { as: "page", foreignKey: "lesson_id" });
Lesson.hasMany(LessonObjective, { as: "objectives", foreignKey: "lesson_id" });

// ── UnitQuiz ──────────────────────────────────────────────────────────────────
UnitQuiz.belongsTo(Unit, { as: "unit", foreignKey: "unit_id" });
UnitQuiz.belongsTo(mdl_Users, { as: "creator", foreignKey: "createdBy" });
UnitQuiz.belongsTo(mdl_Users, { as: "updater", foreignKey: "updatedBy" });
UnitQuiz.hasMany(QuizQuestion, { as: "questions", foreignKey: "quiz_id" });

// ── CourseAssessment ──────────────────────────────────────────────────────────
CourseAssessment.belongsTo(Course, { as: "course", foreignKey: "course_id" });
CourseAssessment.belongsTo(mdl_Users, { as: "creator", foreignKey: "createdBy" });
CourseAssessment.belongsTo(mdl_Users, { as: "updater", foreignKey: "updatedBy" });
CourseAssessment.hasMany(QuizQuestion, { as: "questions", foreignKey: "assessment_id" });

// ── QuizQuestion ──────────────────────────────────────────────────────────────
QuizQuestion.belongsTo(UnitQuiz, { as: "quiz", foreignKey: "quiz_id" });
QuizQuestion.belongsTo(CourseAssessment, { as: "assessment", foreignKey: "assessment_id" });
QuizQuestion.hasMany(QuizOption, { as: "options", foreignKey: "question_id" });

// ── QuizOption ────────────────────────────────────────────────────────────────
QuizOption.belongsTo(QuizQuestion, { as: "question", foreignKey: "question_id" });

module.exports = {
    Course, CourseProduct, CourseRole, CourseProductCategory,
    Unit, Lesson, LessonPage,
    CourseObjective, LessonObjective,
    CoursePrerequisite, CourseAssessment,
    UnitQuiz, QuizQuestion, QuizOption,
};