"""
Админ-панель для реферальной системы.
"""
from django.contrib import admin
from django.utils.html import format_html
from .models import (
    ReferralSettings,
    ReferralLevel,
    UserReferralProfile,
    BonusAccount,
    ReferralEarning,
    PointsTransaction,
    BonusTransaction,
    PromoCode,
    PromoCodeUsage,
    ReferralInvitedEmail,
    UserActivityDay,
    PendingReferralBonus,
)


@admin.register(ReferralSettings)
class ReferralSettingsAdmin(admin.ModelAdmin):
    """Админ для настроек реферальной программы."""
    
    list_display = [
        'level1_commission',
        'level2_commission',
        'points_direct_referral',
        'points_indirect_referral',
        'updated_at'
    ]
    
    fieldsets = (
        ('Комиссии', {
            'fields': ('level1_commission', 'level2_commission')
        }),
        ('Очки', {
            'fields': ('points_direct_referral', 'points_indirect_referral')
        }),
    )


@admin.register(ReferralLevel)
class ReferralLevelAdmin(admin.ModelAdmin):
    """Админ для уровней реферальной программы."""
    
    list_display = ['level', 'name', 'points_required', 'bonus_payment_percent', 'icon']
    list_editable = ['bonus_payment_percent']
    ordering = ['level']


@admin.register(UserReferralProfile)
class UserReferralProfileAdmin(admin.ModelAdmin):
    """Админ для реферальных профилей."""
    
    list_display = [
        'user_email',
        'referral_code',
        'referred_by_email',
        'current_level',
        'total_points',
        'direct_referrals_count',
        'total_earned',
        'created_at'
    ]
    
    list_filter = ['current_level', 'created_at']
    search_fields = ['user__email', 'referral_code', 'referred_by__email']
    readonly_fields = [
        'referral_code',
        'total_points',
        'direct_referrals_count',
        'indirect_referrals_count',
        'total_earned',
        'created_at',
        'updated_at',
        'referral_link'
    ]
    
    fieldsets = (
        ('Основная информация', {
            'fields': ('user', 'referral_code', 'referred_by', 'referral_link')
        }),
        ('Уровень и очки', {
            'fields': ('current_level', 'total_points')
        }),
        ('Статистика', {
            'fields': (
                'direct_referrals_count',
                'indirect_referrals_count',
                'total_earned'
            )
        }),
        ('Даты', {
            'fields': ('created_at', 'updated_at')
        }),
    )
    
    def user_email(self, obj):
        return obj.user.email
    user_email.short_description = 'Email'
    
    def referred_by_email(self, obj):
        return obj.referred_by.email if obj.referred_by else '-'
    referred_by_email.short_description = 'Пригласил'
    
    def referral_link(self, obj):
        link = obj.get_referral_link()
        return format_html('<a href="{}" target="_blank">{}</a>', link, link)
    referral_link.short_description = 'Реферальная ссылка'


@admin.register(BonusAccount)
class BonusAccountAdmin(admin.ModelAdmin):
    """Админ для бонусных счетов."""
    
    list_display = [
        'user_email',
        'balance',
        'total_earned',
        'total_spent',
        'updated_at'
    ]
    
    list_editable = ['balance']
    
    search_fields = ['user__email']
    readonly_fields = ['created_at', 'updated_at']
    
    fieldsets = (
        ('Основная информация', {
            'fields': ('user',)
        }),
        ('Баланс и статистика', {
            'fields': ('balance', 'total_earned', 'total_spent'),
            'description': 'Внимание: изменение баланса напрямую не создает транзакцию в истории. '
                         'Для корректного учета используйте методы add_bonus() и spend_bonus() модели.'
        }),
        ('Временные метки', {
            'fields': ('created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    def user_email(self, obj):
        return obj.user.email
    user_email.short_description = 'Email'
    
    def save_model(self, request, obj, form, change):
        """
        Сохранить модель с логированием изменений.
        """
        if change:
            # Получаем старые значения для логирования
            old_obj = BonusAccount.objects.get(pk=obj.pk)
            
            # Логируем изменения баланса
            if old_obj.balance != obj.balance:
                from .models import BonusTransaction
                from decimal import Decimal
                
                diff = obj.balance - old_obj.balance
                if diff != 0:
                    transaction_type = 'earn' if diff > 0 else 'spend'
                    BonusTransaction.objects.create(
                        user=obj.user,
                        amount=abs(diff),
                        transaction_type=transaction_type,
                        reason=f'Ручное изменение баланса администратором {request.user.email}',
                        balance_after=obj.balance
                    )
                    
                    # Обновляем статистику
                    if diff > 0:
                        obj.total_earned += diff
                    else:
                        obj.total_spent += abs(diff)
            
            # Логируем изменения статистики (если изменены напрямую)
            if old_obj.total_earned != obj.total_earned or old_obj.total_spent != obj.total_spent:
                # Если статистика изменена напрямую, просто сохраняем
                pass
        
        super().save_model(request, obj, form, change)


@admin.register(ReferralEarning)
class ReferralEarningAdmin(admin.ModelAdmin):
    """Админ для заработков с рефералов."""
    
    list_display = [
        'referrer_email',
        'referral_email',
        'level',
        'payment_amount',
        'commission_percent',
        'earned_amount',
        'created_at'
    ]
    
    list_filter = ['level', 'created_at']
    search_fields = ['referrer__email', 'referral__email']
    readonly_fields = [
        'referrer',
        'referral',
        'payment',
        'level',
        'payment_amount',
        'commission_percent',
        'earned_amount',
        'created_at'
    ]
    
    def referrer_email(self, obj):
        return obj.referrer.email
    referrer_email.short_description = 'Реферер'
    
    def referral_email(self, obj):
        return obj.referral.email
    referral_email.short_description = 'Реферал'


@admin.register(PointsTransaction)
class PointsTransactionAdmin(admin.ModelAdmin):
    """Админ для транзакций очков."""
    
    list_display = ['user_email', 'points', 'reason', 'balance_after', 'created_at']
    list_filter = ['created_at']
    search_fields = ['user__email', 'reason']
    readonly_fields = ['user', 'points', 'reason', 'balance_after', 'created_at']
    
    def user_email(self, obj):
        return obj.user.email
    user_email.short_description = 'Email'


@admin.register(BonusTransaction)
class BonusTransactionAdmin(admin.ModelAdmin):
    """Админ для транзакций бонусов."""
    
    list_display = [
        'user_email',
        'amount',
        'transaction_type',
        'reason',
        'balance_after',
        'created_at'
    ]
    
    list_filter = ['transaction_type', 'created_at']
    search_fields = ['user__email', 'reason']
    readonly_fields = ['user', 'amount', 'transaction_type', 'reason', 'balance_after', 'created_at']
    
    def user_email(self, obj):
        return obj.user.email
    user_email.short_description = 'Email'


@admin.register(PromoCode)
class PromoCodeAdmin(admin.ModelAdmin):
    """Админ для промокодов."""
    
    list_display = [
        'code',
        'name',
        'discount_display',
        'current_uses',
        'max_uses',
        'valid_until',
        'is_active',
        'created_at'
    ]
    
    list_filter = ['is_active', 'discount_type', 'created_at']
    search_fields = ['code', 'name', 'description']
    filter_horizontal = ['applicable_plans']
    
    fieldsets = (
        ('Основная информация', {
            'fields': ('code', 'name', 'description')
        }),
        ('Скидка', {
            'fields': ('discount_type', 'discount_value')
        }),
        ('Применимость', {
            'fields': ('applicable_plans',)
        }),
        ('Ограничения', {
            'fields': ('max_uses', 'current_uses', 'valid_until', 'is_active')
        }),
        ('Метаданные', {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['current_uses', 'created_at', 'updated_at']
    
    def discount_display(self, obj):
        if obj.discount_type == 'percent':
            return f'{obj.discount_value}%'
        return f'{obj.discount_value} ₽'
    discount_display.short_description = 'Скидка'
    
    def save_model(self, request, obj, form, change):
        if not change:
            obj.created_by = request.user
        super().save_model(request, obj, form, change)


@admin.register(PromoCodeUsage)
class PromoCodeUsageAdmin(admin.ModelAdmin):
    """Админ для использований промокодов."""
    
    list_display = [
        'user_email',
        'promo_code_code',
        'original_amount',
        'discount_amount',
        'final_amount',
        'created_at'
    ]
    
    list_filter = ['created_at', 'promo_code']
    search_fields = ['user__email', 'promo_code__code']
    readonly_fields = [
        'user',
        'promo_code',
        'payment',
        'original_amount',
        'discount_amount',
        'final_amount',
        'created_at'
    ]
    
    def user_email(self, obj):
        return obj.user.email
    user_email.short_description = 'Email'
    
    def promo_code_code(self, obj):
        return obj.promo_code.code
    promo_code_code.short_description = 'Промокод'


@admin.register(ReferralInvitedEmail)
class ReferralInvitedEmailAdmin(admin.ModelAdmin):
    """Бэклог приглашённых email (защита от накрутки)."""
    list_display = ['email', 'referrer', 'referred_user', 'created_at']
    search_fields = ['email', 'referrer__email', 'referred_user__email']
    readonly_fields = ['email', 'referrer', 'referred_user', 'created_at']
    list_filter = ['created_at']


@admin.register(UserActivityDay)
class UserActivityDayAdmin(admin.ModelAdmin):
    """Дни активности пользователей (для проверки условий начисления бонусов)."""
    list_display = ['user', 'date', 'created_at']
    list_filter = ['date']
    search_fields = ['user__email']
    readonly_fields = ['user', 'date', 'created_at']


@admin.register(PendingReferralBonus)
class PendingReferralBonusAdmin(admin.ModelAdmin):
    """Ожидающие начисления бонусов за рефералов."""
    list_display = ['referrer', 'referred_user', 'points', 'level', 'status', 'referred_at', 'paid_at']
    list_filter = ['status', 'level']
    search_fields = ['referrer__email', 'referred_user__email']
    readonly_fields = ['referrer', 'referred_user', 'referred_at', 'points', 'level', 'reason', 'paid_at', 'created_at']