package db

import (
	"encoding/json"
	"fmt"
	"gestion/models"
	"strconv"

	"gorm.io/gorm"
)

// DefaultDeliverySchedule retourne un planning de livraison par défaut (tous les jours, 9h-20h)
func DefaultDeliverySchedule() models.DeliverySchedule {
	day := models.DaySchedule{Enabled: true, OpenTime: "09:00", CloseTime: "20:00"}
	return models.DeliverySchedule{
		Monday: day, Tuesday: day, Wednesday: day, Thursday: day,
		Friday: day, Saturday: day, Sunday: day,
	}
}

// CalcPointsFromTiers retourne le nombre de points correspondant au total selon les paliers
func CalcPointsFromTiers(total float64, tiers []models.PointsTier) int {
	for _, t := range tiers {
		if total >= t.Min && (t.Max == 0 || total <= t.Max) {
			return t.Points
		}
	}
	return 0
}

// DefaultSettings retourne les paramètres par défaut
func DefaultSettings() models.AppSettings {
	return models.AppSettings{
		PenaltiesEnabled: true,
		ShowAmendeScore:  true,
		PenaltyTiers: []models.PenaltyTier{
			{MinCancel: 0, Amount: 20},
			{MinCancel: 1, Amount: 50},
			{MinCancel: 2, Amount: 100},
			{MinCancel: 3, Amount: 150},
		},
		PointsEnabled:   true,
		ReferralEnabled: true,
		ReferralAmount:  0,
		PointsPools: []models.PointsPool{
			{
				Key:        "pool_0",
				Name:       "Pool 1",
				Categories: []string{},
				Tiers: []models.PointsTier{
					{Min: 30, Max: 50, Points: 1},
					{Min: 60, Max: 150, Points: 2},
					{Min: 160, Max: 300, Points: 3},
					{Min: 310, Max: 400, Points: 5},
					{Min: 401, Max: 0, Points: 10},
				},
			},
			{
				Key:        "pool_1",
				Name:       "Pool 2",
				Categories: []string{},
				Tiers: []models.PointsTier{
					{Min: 30, Max: 100, Points: 1},
					{Min: 110, Max: 200, Points: 2},
					{Min: 210, Max: 0, Points: 3},
				},
			},
		},
		ShopName:        "Milieu-Nantais",
		ContactTelegram: "MLN44LA",
		DeliveryMode: models.DeliveryModeConfig{
			Mode:           "single",
			CategoryRoutes: []models.CategoryRoute{},
		},
		AdminColorPrimary:    "#7c3aed",
		AdminColorSecondary:  "#000000",
		AdminColorSuccess:    "#4ade80",
		AdminColorDanger:     "#ef4444",
		AdminColorWarning:    "#f59e0b",
		ClientColorPrimary:   "#7c3aed",
		ClientColorSecondary: "#000000",
		ClientColorSuccess:   "#4ade80",
		ClientColorDanger:    "#ef4444",
		ClientColorWarning:   "#f59e0b",
		ClientTitleGradientFrom: "#a78bfa",
		ClientTitleGradientTo:   "#22d3ee",
		DeliverySchedule: DefaultDeliverySchedule(),
		PostalZones: []models.PostalZone{
			{Name: "Zone 30€", MinAmount: 30, Codes: []string{"44000", "44100", "44200", "44300"}},
			{Name: "Zone 50€", MinAmount: 50, Codes: []string{
				"44400", "44880", "44120", "44230", "44115",
				"44980", "44470", "44240", "44700", "44800", "44340", "44620", "44830",
			}},
			{Name: "Zone 100€", MinAmount: 100, Codes: []string{
				"44860", "44220", "44118", "44710", "44690", "44119",
			}},
		},
		Telegram2FAEnabled: false,
	}
}

// GetSettings récupère les paramètres depuis la DB
func (d *Database) GetSettings() (models.AppSettings, error) {
	settings := DefaultSettings()

	var rows []struct {
		Key   string `gorm:"column:key"`
		Value string `gorm:"column:value"`
	}
	if err := d.GDB.Table("app_settings").Select("key, value").Scan(&rows).Error; err != nil {
		return settings, fmt.Errorf("erreur lecture settings: %w", err)
	}

	for _, row := range rows {
		switch row.Key {
		case "penalties_enabled":
			settings.PenaltiesEnabled = row.Value == "true"
		case "show_amende_score":
			settings.ShowAmendeScore = row.Value == "true"
		case "points_enabled":
			settings.PointsEnabled = row.Value == "true"
		case "points_pools":
			var pools []models.PointsPool
			if err := json.Unmarshal([]byte(row.Value), &pools); err == nil {
				settings.PointsPools = pools
			}
		case "points_reward":
			// row.Value peut valoir la chaîne littérale "null" (récompense
			// désactivée puis sauvegardée : json.Marshal(nil *PointsReward)
			// produit "null"). json.Unmarshal d'un null JSON dans une valeur
			// non-pointeur est un no-op sans erreur (voir doc encoding/json),
			// donc sans ce garde-fou &reward pointerait vers une struct vide
			// mais non-nil, et la récompense réapparaîtrait activée.
			if row.Value != "null" && row.Value != "" {
				var reward models.PointsReward
				if err := json.Unmarshal([]byte(row.Value), &reward); err == nil {
					settings.PointsReward = &reward
				}
			}
		case "referral_enabled":
			settings.ReferralEnabled = row.Value == "true"
		case "referral_amount":
			if v, err := strconv.ParseFloat(row.Value, 64); err == nil {
				settings.ReferralAmount = v
			}
		case "crypto_payment_enabled":
			settings.CryptoPaymentEnabled = row.Value == "true"
		case "crypto_only":
			settings.CryptoOnly = row.Value == "true"
		case "nowpayments_api_key":
			settings.NowPaymentsAPIKey = row.Value
		case "nowpayments_ipn_secret":
			settings.NowPaymentsIPNSecret = row.Value
		case "nowpayments_currencies":
			var currencies []string
			if err := json.Unmarshal([]byte(row.Value), &currencies); err == nil {
				settings.NowPaymentsCurrencies = currencies
			}
		case "delivery_schedule":
			var sched models.DeliverySchedule
			if err := json.Unmarshal([]byte(row.Value), &sched); err == nil {
				settings.DeliverySchedule = sched
			}
		case "postal_zones":
			var zones []models.PostalZone
			if err := json.Unmarshal([]byte(row.Value), &zones); err == nil {
				settings.PostalZones = zones
			}
		case "contact_telegram":
			settings.ContactTelegram = row.Value
		case "telegram_bot_token":
			settings.TelegramBotToken = row.Value
		case "telegram_bot_username":
			settings.TelegramBotUsername = row.Value
		case "telegram_notifications_enabled":
			settings.TelegramNotificationsEnabled = row.Value == "true"
		case "delivery_mode":
			var mode models.DeliveryModeConfig
			if err := json.Unmarshal([]byte(row.Value), &mode); err == nil {
				settings.DeliveryMode = mode
			}
		case "telegram_2fa_enabled":
			settings.Telegram2FAEnabled = row.Value == "true"
		case "shop_name":
			settings.ShopName = row.Value
		case "admin_color_primary":
			settings.AdminColorPrimary = row.Value
		case "admin_color_secondary":
			settings.AdminColorSecondary = row.Value
		case "admin_color_success":
			settings.AdminColorSuccess = row.Value
		case "admin_color_danger":
			settings.AdminColorDanger = row.Value
		case "admin_color_warning":
			settings.AdminColorWarning = row.Value
		case "client_color_primary":
			settings.ClientColorPrimary = row.Value
		case "client_color_secondary":
			settings.ClientColorSecondary = row.Value
		case "client_color_success":
			settings.ClientColorSuccess = row.Value
		case "client_color_danger":
			settings.ClientColorDanger = row.Value
		case "client_color_warning":
			settings.ClientColorWarning = row.Value
		case "client_title_gradient_from":
			settings.ClientTitleGradientFrom = row.Value
		case "client_title_gradient_to":
			settings.ClientTitleGradientTo = row.Value
		}
	}
	return settings, nil
}

// UpdateSettings sauvegarde les paramètres dans la DB
func (d *Database) UpdateSettings(s models.AppSettings) error {
	boolStr := func(b bool) string {
		if b {
			return "true"
		}
		return "false"
	}

	if s.PointsPools == nil {
		s.PointsPools = []models.PointsPool{}
	}
	for i := range s.PointsPools {
		if s.PointsPools[i].Categories == nil {
			s.PointsPools[i].Categories = []string{}
		}
		if s.PointsPools[i].Tiers == nil {
			s.PointsPools[i].Tiers = []models.PointsTier{}
		}
	}

	poolsJSON, err := json.Marshal(s.PointsPools)
	if err != nil {
		return fmt.Errorf("erreur sérialisation pools: %w", err)
	}

	rewardJSON, err := json.Marshal(s.PointsReward)
	if err != nil {
		return fmt.Errorf("erreur sérialisation points_reward: %w", err)
	}

	if s.NowPaymentsCurrencies == nil {
		s.NowPaymentsCurrencies = []string{}
	}
	currenciesJSON, err := json.Marshal(s.NowPaymentsCurrencies)
	if err != nil {
		return fmt.Errorf("erreur sérialisation nowpayments_currencies: %w", err)
	}

	schedJSON, err := json.Marshal(s.DeliverySchedule)
	if err != nil {
		return fmt.Errorf("erreur sérialisation delivery_schedule: %w", err)
	}

	if s.PostalZones == nil {
		s.PostalZones = []models.PostalZone{}
	}
	zonesJSON, err := json.Marshal(s.PostalZones)
	if err != nil {
		return fmt.Errorf("erreur sérialisation postal_zones: %w", err)
	}

	if s.DeliveryMode.CategoryRoutes == nil {
		s.DeliveryMode.CategoryRoutes = []models.CategoryRoute{}
	}
	deliveryModeJSON, err := json.Marshal(s.DeliveryMode)
	if err != nil {
		return fmt.Errorf("erreur sérialisation delivery_mode: %w", err)
	}

	if s.ContactTelegram == "" {
		s.ContactTelegram = "MLN44LA"
	}
	pairs := [][2]string{
		{"penalties_enabled", boolStr(s.PenaltiesEnabled)},
		{"show_amende_score", boolStr(s.ShowAmendeScore)},
		{"points_enabled", boolStr(s.PointsEnabled)},
		{"points_pools", string(poolsJSON)},
		{"points_reward", string(rewardJSON)},
		{"referral_enabled", boolStr(s.ReferralEnabled)},
		{"referral_amount", strconv.FormatFloat(s.ReferralAmount, 'f', 2, 64)},
		{"crypto_payment_enabled", boolStr(s.CryptoPaymentEnabled)},
		{"crypto_only", boolStr(s.CryptoOnly)},
		{"nowpayments_api_key", s.NowPaymentsAPIKey},
		{"nowpayments_ipn_secret", s.NowPaymentsIPNSecret},
		{"nowpayments_currencies", string(currenciesJSON)},
		{"delivery_schedule", string(schedJSON)},
		{"postal_zones", string(zonesJSON)},
		{"telegram_bot_token", s.TelegramBotToken},
		{"telegram_bot_username", s.TelegramBotUsername},
		{"telegram_notifications_enabled", boolStr(s.TelegramNotificationsEnabled)},
		{"telegram_2fa_enabled", boolStr(s.Telegram2FAEnabled)},
		{"delivery_mode", string(deliveryModeJSON)},
		{"shop_name", s.ShopName},
		{"contact_telegram", s.ContactTelegram},
		{"admin_color_primary", s.AdminColorPrimary},
		{"admin_color_secondary", s.AdminColorSecondary},
		{"admin_color_success", s.AdminColorSuccess},
		{"admin_color_danger", s.AdminColorDanger},
		{"admin_color_warning", s.AdminColorWarning},
		{"client_color_primary", s.ClientColorPrimary},
		{"client_color_secondary", s.ClientColorSecondary},
		{"client_color_success", s.ClientColorSuccess},
		{"client_color_danger", s.ClientColorDanger},
		{"client_color_warning", s.ClientColorWarning},
		{"client_title_gradient_from", s.ClientTitleGradientFrom},
		{"client_title_gradient_to", s.ClientTitleGradientTo},
	}

	upsert := `INSERT INTO app_settings (key, value) VALUES (?, ?)
	           ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value`

	return d.GDB.Transaction(func(tx *gorm.DB) error {
		for _, p := range pairs {
			if err := tx.Exec(upsert, p[0], p[1]).Error; err != nil {
				return fmt.Errorf("erreur upsert %s: %w", p[0], err)
			}
		}
		return nil
	})
}