const mdl_Users       = require('../users/users.mdl');
const mdl_TierPlans   = require('./tier_plans.mdl');
const mdl_UserTiers   = require('./user_tiers.mdl');
const mdl_Payments    = require('./payments.mdl');
const mdl_PlanCourses = require('./plan_courses.mdl');
const { Course }      = require('../courses/courses.mdl');  // ← named export

// ─── UserTiers ────────────────────────────────────────────────────────────────
mdl_UserTiers.belongsTo(mdl_Users, { foreignKey: 'user_id',    as: 'user' });
mdl_UserTiers.belongsTo(mdl_Users, { foreignKey: 'granted_by', as: 'grantedByUser' });
mdl_UserTiers.belongsTo(mdl_Users, { foreignKey: 'revoked_by', as: 'revokedByUser' });
mdl_Users.hasMany(mdl_UserTiers,   { foreignKey: 'user_id',    as: 'tiers' });

// ─── Payments ─────────────────────────────────────────────────────────────────
mdl_Payments.belongsTo(mdl_Users,     { foreignKey: 'user_id', as: 'user' });
mdl_Payments.belongsTo(mdl_TierPlans, { foreignKey: 'plan_id', as: 'plan' });
mdl_Payments.belongsTo(mdl_UserTiers, { foreignKey: 'tier_id', as: 'tier' });

// ─── Plan ↔ Courses ───────────────────────────────────────────────────────────
mdl_TierPlans.belongsToMany(Course, {
  through:    mdl_PlanCourses,
  foreignKey: 'plan_id',
  otherKey:   'course_id',
  as:         'courses',
});

Course.belongsToMany(mdl_TierPlans, {
  through:    mdl_PlanCourses,
  foreignKey: 'course_id',
  otherKey:   'plan_id',
  as:         'plans',
});

mdl_PlanCourses.belongsTo(mdl_TierPlans, { foreignKey: 'plan_id',   as: 'plan' });
mdl_PlanCourses.belongsTo(Course,        { foreignKey: 'course_id', as: 'course' });
Course.hasOne(mdl_PlanCourses, { as: 'planCourse', foreignKey: 'course_id' });
mdl_TierPlans.hasMany(mdl_PlanCourses, { as: 'planCourses', foreignKey: 'plan_id' });

module.exports = { mdl_TierPlans, mdl_UserTiers, mdl_Payments, mdl_PlanCourses };