package repositories

import (
	"time"

	"gorm.io/gorm"

	"github.com/treytartt/casera-api/internal/models"
)

// SubscriptionRepository handles database operations for subscriptions
type SubscriptionRepository struct {
	db *gorm.DB
}

// NewSubscriptionRepository creates a new subscription repository
func NewSubscriptionRepository(db *gorm.DB) *SubscriptionRepository {
	return &SubscriptionRepository{db: db}
}

// === User Subscription ===

// FindByUserID finds a subscription by user ID
func (r *SubscriptionRepository) FindByUserID(userID uint) (*models.UserSubscription, error) {
	var sub models.UserSubscription
	err := r.db.Where("user_id = ?", userID).First(&sub).Error
	if err != nil {
		return nil, err
	}
	return &sub, nil
}

// GetOrCreate gets or creates a subscription for a user (defaults to free tier)
func (r *SubscriptionRepository) GetOrCreate(userID uint) (*models.UserSubscription, error) {
	sub, err := r.FindByUserID(userID)
	if err == nil {
		return sub, nil
	}

	if err == gorm.ErrRecordNotFound {
		sub = &models.UserSubscription{
			UserID:   userID,
			Tier:     models.TierFree,
			AutoRenew: true,
		}
		if err := r.db.Create(sub).Error; err != nil {
			return nil, err
		}
		return sub, nil
	}

	return nil, err
}

// Update updates a subscription
func (r *SubscriptionRepository) Update(sub *models.UserSubscription) error {
	return r.db.Save(sub).Error
}

// UpgradeToPro upgrades a user to Pro tier
func (r *SubscriptionRepository) UpgradeToPro(userID uint, expiresAt time.Time, platform string) error {
	now := time.Now().UTC()
	return r.db.Model(&models.UserSubscription{}).
		Where("user_id = ?", userID).
		Updates(map[string]interface{}{
			"tier":          models.TierPro,
			"subscribed_at": now,
			"expires_at":    expiresAt,
			"cancelled_at":  nil,
			"platform":      platform,
			"auto_renew":    true,
		}).Error
}

// DowngradeToFree downgrades a user to Free tier
func (r *SubscriptionRepository) DowngradeToFree(userID uint) error {
	now := time.Now().UTC()
	return r.db.Model(&models.UserSubscription{}).
		Where("user_id = ?", userID).
		Updates(map[string]interface{}{
			"tier":         models.TierFree,
			"cancelled_at": now,
			"auto_renew":   false,
		}).Error
}

// SetAutoRenew sets the auto-renew flag
func (r *SubscriptionRepository) SetAutoRenew(userID uint, autoRenew bool) error {
	return r.db.Model(&models.UserSubscription{}).
		Where("user_id = ?", userID).
		Update("auto_renew", autoRenew).Error
}

// UpdateReceiptData updates the Apple receipt data
func (r *SubscriptionRepository) UpdateReceiptData(userID uint, receiptData string) error {
	return r.db.Model(&models.UserSubscription{}).
		Where("user_id = ?", userID).
		Update("apple_receipt_data", receiptData).Error
}

// UpdatePurchaseToken updates the Google purchase token
func (r *SubscriptionRepository) UpdatePurchaseToken(userID uint, token string) error {
	return r.db.Model(&models.UserSubscription{}).
		Where("user_id = ?", userID).
		Update("google_purchase_token", token).Error
}

// === Tier Limits ===

// GetTierLimits gets the limits for a subscription tier
func (r *SubscriptionRepository) GetTierLimits(tier models.SubscriptionTier) (*models.TierLimits, error) {
	var limits models.TierLimits
	err := r.db.Where("tier = ?", tier).First(&limits).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			// Return defaults
			if tier == models.TierFree {
				defaults := models.GetDefaultFreeLimits()
				return &defaults, nil
			}
			defaults := models.GetDefaultProLimits()
			return &defaults, nil
		}
		return nil, err
	}
	return &limits, nil
}

// GetAllTierLimits gets all tier limits
func (r *SubscriptionRepository) GetAllTierLimits() ([]models.TierLimits, error) {
	var limits []models.TierLimits
	err := r.db.Find(&limits).Error
	return limits, err
}

// === Subscription Settings (Singleton) ===

// GetSettings gets the subscription settings
func (r *SubscriptionRepository) GetSettings() (*models.SubscriptionSettings, error) {
	var settings models.SubscriptionSettings
	err := r.db.First(&settings).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			// Return default settings (limitations disabled)
			return &models.SubscriptionSettings{
				EnableLimitations: false,
			}, nil
		}
		return nil, err
	}
	return &settings, nil
}

// === Upgrade Triggers ===

// GetUpgradeTrigger gets an upgrade trigger by key
func (r *SubscriptionRepository) GetUpgradeTrigger(key string) (*models.UpgradeTrigger, error) {
	var trigger models.UpgradeTrigger
	err := r.db.Where("trigger_key = ? AND is_active = ?", key, true).First(&trigger).Error
	if err != nil {
		return nil, err
	}
	return &trigger, nil
}

// GetAllUpgradeTriggers gets all active upgrade triggers
func (r *SubscriptionRepository) GetAllUpgradeTriggers() ([]models.UpgradeTrigger, error) {
	var triggers []models.UpgradeTrigger
	err := r.db.Where("is_active = ?", true).Find(&triggers).Error
	return triggers, err
}

// === Feature Benefits ===

// GetFeatureBenefits gets all active feature benefits
func (r *SubscriptionRepository) GetFeatureBenefits() ([]models.FeatureBenefit, error) {
	var benefits []models.FeatureBenefit
	err := r.db.Where("is_active = ?", true).Order("display_order").Find(&benefits).Error
	return benefits, err
}

// === Promotions ===

// GetActivePromotions gets all currently active promotions for a tier
func (r *SubscriptionRepository) GetActivePromotions(tier models.SubscriptionTier) ([]models.Promotion, error) {
	now := time.Now().UTC()
	var promotions []models.Promotion
	err := r.db.Where("is_active = ? AND target_tier = ? AND start_date <= ? AND end_date >= ?",
		true, tier, now, now).
		Order("start_date DESC").
		Find(&promotions).Error
	return promotions, err
}

// GetPromotionByID gets a promotion by ID
func (r *SubscriptionRepository) GetPromotionByID(promotionID string) (*models.Promotion, error) {
	var promotion models.Promotion
	err := r.db.Where("promotion_id = ? AND is_active = ?", promotionID, true).First(&promotion).Error
	if err != nil {
		return nil, err
	}
	return &promotion, nil
}