from django.contrib import admin
from django.utils.html import format_html
from django.db.models import Sum
from .models import ESP32Config, Order, Salesperson, WeChatPayConfig, Service, ARService, ProductFeature
import qrcode
from io import BytesIO
import base64

# 自定义后台标题
admin.site.site_header = "量迹AI硬件销售管理后台"
admin.site.site_title = "量迹AI后台"
admin.site.index_title = "欢迎使用量迹AI管理系统"

class ProductFeatureInline(admin.TabularInline):
    model = ProductFeature
    extra = 1
    fields = ('title', 'description', 'icon_name', 'icon_image', 'icon_url', 'order')

@admin.register(WeChatPayConfig)
class WeChatPayConfigAdmin(admin.ModelAdmin):
    list_display = ('app_id', 'mch_id', 'is_active', 'notify_url')
    list_filter = ('is_active',)
    search_fields = ('app_id', 'mch_id')
    fieldsets = (
        ('基本配置', {
            'fields': ('app_id', 'mch_id', 'is_active')
        }),
        ('安全配置', {
            'fields': ('api_key', 'app_secret')
        }),
        ('回调配置', {
            'fields': ('notify_url',)
        }),
    )

@admin.register(ESP32Config)
class ESP32ConfigAdmin(admin.ModelAdmin):
    list_display = ('name', 'chip_type', 'price', 'has_camera', 'has_microphone')
    list_filter = ('chip_type', 'has_camera')
    search_fields = ('name', 'description')
    inlines = [ProductFeatureInline]
    fieldsets = (
        ('基本信息', {
            'fields': ('name', 'price', 'description')
        }),
        ('硬件参数', {
            'fields': ('chip_type', 'flash_size', 'ram_size', 'has_camera', 'has_microphone')
        }),
        ('详情页图片', {
            'fields': ('detail_image', 'detail_image_url'),
            'description': '图片上传和URL二选一，优先使用URL'
        }),
    )

@admin.register(Service)
class ServiceAdmin(admin.ModelAdmin):
    list_display = ('title', 'created_at')
    search_fields = ('title', 'description')
    fieldsets = (
        ('基本信息', {
            'fields': ('title', 'description', 'color')
        }),
        ('图标', {
            'fields': ('icon', 'icon_url'),
            'description': '图标上传和URL二选一，优先使用URL'
        }),
        ('详情页图片', {
            'fields': ('detail_image', 'detail_image_url'),
            'description': '图片上传和URL二选一，优先使用URL'
        }),
        ('详细内容', {
            'fields': ('features',)
        }),
    )

@admin.register(ARService)
class ARServiceAdmin(admin.ModelAdmin):
    list_display = ('title', 'created_at')
    search_fields = ('title', 'description')
    fieldsets = (
        ('基本信息', {
            'fields': ('title', 'description')
        }),
        ('封面/长图', {
            'fields': ('cover_image', 'cover_image_url'),
            'description': '图片上传和URL二选一，优先使用URL'
        }),
    )

@admin.register(Salesperson)
class SalespersonAdmin(admin.ModelAdmin):
    list_display = ('name', 'code', 'total_sales', 'view_promotion_url')
    search_fields = ('name', 'code')
    readonly_fields = ('promotion_qr_code', 'promotion_url_display', 'total_sales_display')

    def get_queryset(self, request):
        queryset = super().get_queryset(request)
        queryset = queryset.annotate(
            _total_sales=Sum('orders__total_price', default=0)
        )
        return queryset

    def total_sales(self, obj):
        # 仅计算已支付的订单
        paid_sales = obj.orders.filter(status='paid').aggregate(total=Sum('total_price'))['total']
        return f"¥{paid_sales or 0:.2f}"
    total_sales.short_description = "累计销售额 (已支付)"
    total_sales.admin_order_field = '_total_sales'

    def total_sales_display(self, obj):
        return self.total_sales(obj)
    total_sales_display.short_description = "累计销售额 (已支付)"

    def promotion_url(self, obj):
        # 假设前端部署在 localhost:5173，生产环境需配置
        base_url = "http://localhost:5173" 
        return f"{base_url}/?ref={obj.code}"

    def view_promotion_url(self, obj):
        url = self.promotion_url(obj)
        return format_html('<a href="{}" target="_blank">打开推广链接</a>', url)
    view_promotion_url.short_description = "推广链接"

    def promotion_url_display(self, obj):
        return self.promotion_url(obj)
    promotion_url_display.short_description = "完整推广链接"

    def promotion_qr_code(self, obj):
        if not obj.code:
            return "请先保存以生成二维码"
        
        url = self.promotion_url(obj)
        qr = qrcode.QRCode(
            version=1,
            error_correction=qrcode.constants.ERROR_CORRECT_L,
            box_size=10,
            border=4,
        )
        qr.add_data(url)
        qr.make(fit=True)

        img = qr.make_image(fill_color="black", back_color="white")
        buffer = BytesIO()
        img.save(buffer, format="PNG")
        img_str = base64.b64encode(buffer.getvalue()).decode()
        
        return format_html('<img src="data:image/png;base64,{}" width="200" height="200" />', img_str)
    
    promotion_qr_code.short_description = "推广二维码"

    fieldsets = (
        ('基本信息', {
            'fields': ('name', 'code')
        }),
        ('推广工具', {
            'fields': ('promotion_url_display', 'promotion_qr_code')
        }),
        ('业绩统计', {
            'fields': ('total_sales_display',)
        }),
    )

@admin.register(Order)
class OrderAdmin(admin.ModelAdmin):
    list_display = ('id', 'customer_name', 'config', 'total_price', 'status', 'salesperson', 'created_at')
    list_filter = ('status', 'salesperson', 'created_at')
    search_fields = ('id', 'customer_name', 'phone_number', 'wechat_trade_no')
    readonly_fields = ('total_price', 'created_at', 'wechat_trade_no')
    
    fieldsets = (
        ('订单信息', {
            'fields': ('config', 'quantity', 'total_price', 'status', 'created_at')
        }),
        ('客户信息', {
            'fields': ('customer_name', 'phone_number', 'shipping_address')
        }),
        ('销售归属', {
            'fields': ('salesperson',)
        }),
        ('支付信息', {
            'fields': ('wechat_trade_no',)
        }),
    )