const mdl_Users          = require('../users/users.mdl');
const mdl_TierCategories = require('./tier_categories.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 mdl_PlanUnits      = require('./plan_units.mdl');
const mdl_PlanLessons    = require('./plan_lessons.mdl');
const mdl_UserTierGrants = require('./user_tier_grants.mdl');
const mdl_SystemBadges   = require('../system_badges/system_badges.mdl');
const Asset              = require('../assets/assets.mdl');
const { Course }         = require('../courses/courses.mdl');
const Unit                = require('../courses/units.mdl');
const Lesson               = require('../courses/lessons.mdl');

// ─── TierCategory ─────────────────────────────────────────────────────────────
mdl_TierCategories.belongsTo(Asset, { foreignKey: 'badge_asset_id', as: 'badgeAsset' });
mdl_TierCategories.hasMany(mdl_TierPlans, { foreignKey: 'tier_category_id', as: 'plans' });

// ─── TierPlans → TierCategory ─────────────────────────────────────────────────
mdl_TierPlans.belongsTo(mdl_TierCategories, { foreignKey: 'tier_category_id', as: 'category' });

// ─── 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.hasMany(mdl_PlanCourses,          { as: 'planCourses',       foreignKey: 'course_id' });
mdl_TierPlans.hasMany(mdl_PlanCourses,   { as: 'planCourses',       foreignKey: 'plan_id' });

// ─── Plan ↔ Units ─────────────────────────────────────────────────────────────
mdl_TierPlans.belongsToMany(Unit, {
  through:    mdl_PlanUnits,
  foreignKey: 'plan_id',
  otherKey:   'unit_id',
  as:         'units',
});
Unit.belongsToMany(mdl_TierPlans, {
  through:    mdl_PlanUnits,
  foreignKey: 'unit_id',
  otherKey:   'plan_id',
  as:         'plans',
});
mdl_PlanUnits.belongsTo(mdl_TierPlans, { foreignKey: 'plan_id', as: 'plan' });
mdl_PlanUnits.belongsTo(Unit,          { foreignKey: 'unit_id', as: 'unit' });
Unit.hasMany(mdl_PlanUnits,            { as: 'planUnits', foreignKey: 'unit_id' });
mdl_TierPlans.hasMany(mdl_PlanUnits,   { as: 'planUnits', foreignKey: 'plan_id' });

// ─── Plan ↔ Lessons ───────────────────────────────────────────────────────────
mdl_TierPlans.belongsToMany(Lesson, {
  through:    mdl_PlanLessons,
  foreignKey: 'plan_id',
  otherKey:   'lesson_id',
  as:         'lessons',
});
Lesson.belongsToMany(mdl_TierPlans, {
  through:    mdl_PlanLessons,
  foreignKey: 'lesson_id',
  otherKey:   'plan_id',
  as:         'plans',
});
mdl_PlanLessons.belongsTo(mdl_TierPlans, { foreignKey: 'plan_id',   as: 'plan' });
mdl_PlanLessons.belongsTo(Lesson,        { foreignKey: 'lesson_id', as: 'lesson' });
Lesson.hasMany(mdl_PlanLessons,          { as: 'planLessons', foreignKey: 'lesson_id' });
mdl_TierPlans.hasMany(mdl_PlanLessons,   { as: 'planLessons', foreignKey: 'plan_id' });

// ─── UserTier → Plan ──────────────────────────────────────────────────────────
mdl_UserTiers.belongsTo(mdl_TierPlans, { foreignKey: 'plan_id', as: 'plan' });
mdl_TierPlans.hasMany(mdl_UserTiers,   { foreignKey: 'plan_id', as: 'userTiers' });

// ─── UserTier → UserTierGrants (item-specific entitlement snapshot) ──────────
mdl_UserTiers.hasMany(mdl_UserTierGrants,     { foreignKey: 'user_tier_id', as: 'grants' });
mdl_UserTierGrants.belongsTo(mdl_UserTiers,   { foreignKey: 'user_tier_id', as: 'userTier' });
mdl_UserTierGrants.belongsTo(mdl_Users,       { foreignKey: 'user_id',      as: 'user' });
mdl_UserTierGrants.belongsTo(mdl_TierPlans,   { foreignKey: 'plan_id',      as: 'plan' });

// ─── SystemBadge → Asset ─────────────────────────────────────────────────────
mdl_SystemBadges.belongsTo(Asset, { foreignKey: 'asset_id', as: 'asset' });

module.exports = {
  mdl_TierCategories,
  mdl_TierPlans,
  mdl_UserTiers,
  mdl_Payments,
  mdl_PlanCourses,
  mdl_PlanUnits,
  mdl_PlanLessons,
  mdl_SystemBadges,
  mdl_UserTierGrants,
};