import React, {useState, useEffect, useRef} from 'react'
import {View, Text, Input, Textarea, ScrollView} from '@tarojs/components'
import Taro, {useRouter} from '@tarojs/taro'
import {Address} from '@nutui/nutui-react-taro'
import {getShopUserAddress, addShopUserAddress, updateShopUserAddress} from '@/api/shop/shopUserAddress'
import type {ShopUserAddress} from '@/api/shop/shopUserAddress/model'
import {parseLngLatFromText} from '@/utils/geofence'
import RegionData from '@/api/json/regions-data.json'

definePageConfig({
    navigationBarTitleText: '新增收货地址',
})

type SelectedLocation = { lng: string; lat: string; name?: string; address?: string }

/** 检查是否为定位权限拒绝错误 */
const isLocationDenied = (e: any) => {
    const msg = String(e?.errMsg || e?.message || e || '')
    return msg.includes('auth deny') || msg.includes('authorize') || msg.includes('permission') || msg.includes('denied') || msg.includes('scope.userLocation')
}

const isUserCancel = (e: any) => {
    const msg = String(e?.errMsg || e?.message || e || '')
    return msg.includes('cancel')
}

/** 检查经纬度是否有效 */
const hasValidLngLat = (addr?: Partial<ShopUserAddress> | null) => {
    if (!addr) return false
    const p = parseLngLatFromText(`${(addr as any)?.lng ?? ''},${(addr as any)?.lat ?? ''}`)
    if (!p) return false
    if (p.lng === 0 && p.lat === 0) return false
    return true
}

const AddressEditPage: React.FC = () => {
    const {id, fromWx} = useRouter().params
    const isEditMode = !!id
    const addressId = id ? Number(id) : undefined
    const fromWxMode = fromWx === '1' || fromWx === 'true'

    const [loading, setLoading] = useState(true)
    const [formData, setFormData] = useState<Partial<ShopUserAddress>>({
        name: '',
        phone: '',
        province: '',
        city: '',
        region: '',
        address: '',
        isDefault: false,
    })
    const [regionText, setRegionText] = useState('')
    const [inputText, setInputText] = useState('')
    const [selectedLocation, setSelectedLocation] = useState<SelectedLocation | null>(null)
    const [regionLocked, setRegionLocked] = useState(false)
    const [regionPickerVisible, setRegionPickerVisible] = useState(false)
    const [regionOptions, setRegionOptions] = useState<any[]>([])
    const wxDraftRef = useRef<Partial<ShopUserAddress> | null>(null)
    const wxDraftPatchedRef = useRef(false)

    /** 初始化省市区选择器数据 */
    useEffect(() => {
        const options = (RegionData as any[]).map((province) => ({
            value: province.label,
            text: province.label,
            children: province.children?.map((city: any) => ({
                value: city.label,
                text: city.label,
                children: city.children?.map((region: any) => ({
                    value: region.label,
                    text: region.label,
                })) || [],
            })) || [],
        }))
        setRegionOptions(options)
    }, [])

    /** 解析省市区 */
    const parseRegion = (text: string) => {
        for (const province of RegionData as any[]) {
            if (text.includes(province.label)) {
                const result: any = {province: province.label}
                if (province.children) {
                    for (const city of province.children) {
                        if (text.includes(city.label)) {
                            result.city = city.label
                            if (city.children) {
                                for (const region of city.children) {
                                    if (text.includes(region.label)) {
                                        result.region = region.label
                                        return result
                                    }
                                }
                            }
                            return result
                        }
                    }
                }
                return result
            }
        }
        return null
    }

    /** 解析地址文本（智能识别） */
    const parseAddressText = (text: string) => {
        const result: any = {}

        // 手机号正则
        const phoneRegex = /1[3-9]\d{9}/
        const phoneMatch = text.match(phoneRegex)
        if (phoneMatch) result.phone = phoneMatch[0]

        // 姓名正则（2-4个中文字符，通常在开头）
        const nameRegex = /^[\u4e00-\u9fa5]{2,4}/
        const nameMatch = text.match(nameRegex)
        if (nameMatch) result.name = nameMatch[0]

        // 省市区识别
        const regionResult = parseRegion(text)
        if (regionResult) {
            result.province = regionResult.province
            result.city = regionResult.city
            result.region = regionResult.region
        }

        // 详细地址提取
        let addressText = text
        if (result.name) addressText = addressText.replace(result.name, '')
        if (result.phone) addressText = addressText.replace(result.phone, '')
        if (result.province) addressText = addressText.replace(result.province, '')
        if (result.city) addressText = addressText.replace(result.city, '')
        if (result.region) addressText = addressText.replace(result.region, '')
        result.address = addressText.replace(/[，,。\s]+/g, '').trim()

        return result
    }

    /** 地址智能识别 */
    const recognizeAddress = () => {
        if (!inputText.trim()) {
            Taro.showToast({title: '请输入要识别的文本', icon: 'none'})
            return
        }

        try {
            const result = parseAddressText(inputText)
            const newFormData: any = {
                ...formData,
                name: result.name || formData.name,
                phone: result.phone || formData.phone,
                address: result.address || formData.address,
            }

            if (!regionLocked) {
                newFormData.province = result.province || formData.province
                newFormData.city = result.city || formData.city
                newFormData.region = result.region || formData.region
            }

            setFormData(newFormData)

            if (!regionLocked && result.province && result.city && result.region) {
                setRegionText(`${result.province} ${result.city} ${result.region}`)
            }

            Taro.showToast({title: regionLocked ? '识别成功（所在地区以定位为准）' : '识别成功', icon: 'success'})
            setInputText('')
        } catch {
            Taro.showToast({title: '识别失败，请检查文本格式', icon: 'none'})
        }
    }

    /** 选择定位 */
    const chooseGeoLocation = async () => {
        const applyChosenLocation = (res: any) => {
            if (!res) return
            if (res.latitude === undefined || res.longitude === undefined) {
                Taro.showToast({title: '定位信息获取失败', icon: 'none'})
                return
            }

            const next: SelectedLocation = {
                lng: String(res.longitude),
                lat: String(res.latitude),
                name: res.name,
                address: res.address,
            }

            // 尝试从地图返回的地址文本解析省市区
            const regionResult = res?.provinceName || res?.cityName || res?.adName
                ? {
                    province: String(res.provinceName || ''),
                    city: String(res.cityName || ''),
                    region: String(res.adName || '')
                }
                : parseRegion(String(res.address || ''))

            const province = String(regionResult?.province || '').trim()
            const city = String(regionResult?.city || '').trim()
            const region = String(regionResult?.region || '').trim()
            if (!province || !city || !region) {
                Taro.showToast({title: '定位未识别到所在地区，请重新选择定位', icon: 'none'})
                return
            }

            setSelectedLocation(next)
            setRegionLocked(true)

            // 将地图选点的地址同步到"收货地址"（剥离省市区，避免重复）
            const rawAddr = String(res.address || '').trim()
            const name = String(res.name || '').trim()
            let detail = rawAddr
            for (const part of [province, city, region]) {
                if (part) detail = detail.replace(part, '')
            }
            detail = detail.replace(/[，,]+/g, ' ').replace(/\s+/g, ' ').trim()
            const base = detail || rawAddr
            const nextDetailAddress = (() => {
                if (!base && !name) return ''
                if (!base) return name
                if (!name) return base
                return base.includes(name) ? base : `${base} ${name}`
            })()

            setFormData(prev => ({
                ...prev,
                lng: next.lng,
                lat: next.lat,
                address: nextDetailAddress || prev.address,
                province,
                city,
                region,
            }))
            setRegionText(`${province} ${city} ${region}`)
        }

        try {
            const initLat = selectedLocation?.lat ? Number(selectedLocation.lat) : undefined
            const initLng = selectedLocation?.lng ? Number(selectedLocation.lng) : undefined
            const latitude = typeof initLat === 'number' && Number.isFinite(initLat) ? initLat : undefined
            const longitude = typeof initLng === 'number' && Number.isFinite(initLng) ? initLng : undefined
            const res = await Taro.chooseLocation({latitude, longitude})
            applyChosenLocation(res)
        } catch (e: any) {
            if (isUserCancel(e)) return
            if (isLocationDenied(e)) {
                try {
                    const modal = await Taro.showModal({
                        title: '需要定位权限',
                        content: '选择定位需要开启定位权限，请在设置中开启后重试。',
                        confirmText: '去设置',
                    })
                    if (modal.confirm) {
                        await Taro.openSetting()
                        const res = await Taro.chooseLocation({})
                        applyChosenLocation(res)
                    }
                } catch (_e) { /* ignore */
                }
                return
            }
            Taro.showToast({title: '打开地图失败，请重试', icon: 'none'})
        }
    }

    /** 打开地区选择器 */
    const openRegionPicker = () => {
        if (regionLocked) {
            Taro.showToast({title: '所在地区已由定位确定，修改请重新选择定位', icon: 'none'})
            return
        }
        setRegionPickerVisible(true)
    }

    /** 地区选择器确认 */
    const handleRegionChange = (value: string[]) => {
        if (regionLocked) {
            Taro.showToast({title: '所在地区已由定位确定，修改请重新选择定位', icon: 'none'})
            return
        }
        const [province, city, region] = value
        setFormData(prev => ({...prev, province, city, region}))
        setRegionText(value.join(' '))
    }

    /** 保存地址 */
    const handleSave = async () => {
        // 表单校验
        if (!formData.name?.trim()) {
            Taro.showToast({title: '请输入收货人姓名', icon: 'none'})
            return
        }
        if (!formData.phone?.trim()) {
            Taro.showToast({title: '请输入手机号', icon: 'none'})
            return
        }
        if (!/^1[3-9]\d{9}$/.test(formData.phone)) {
            Taro.showToast({title: '手机号格式不正确', icon: 'none'})
            return
        }
        if (!formData.province || !formData.city || !formData.region) {
            Taro.showToast({title: '请选择所在地区', icon: 'none'})
            return
        }
        if (!formData.address?.trim()) {
            Taro.showToast({title: '请输入详细地址', icon: 'none'})
            return
        }

        // 经纬度检查（可选，不阻断保存流程）
        const loc = selectedLocation || (hasValidLngLat(formData) ? {
            lng: String(formData.lng),
            lat: String(formData.lat)
        } : null)

        try {
            const submitData: any = {
                name: formData.name,
                phone: formData.phone,
                country: formData.country || '中国',
                province: formData.province,
                city: formData.city,
                region: formData.region,
                address: formData.address,
                isDefault: formData.isDefault ?? true,
                ...(loc ? {lng: loc.lng, lat: loc.lat} : {}),
            }

            if (isEditMode && addressId) {
                submitData.id = addressId
            }

            // 执行新增或更新
            if (isEditMode) {
                await updateShopUserAddress(submitData)
            } else {
                await addShopUserAddress(submitData)
            }

            Taro.showToast({title: `${isEditMode ? '更新' : '保存'}成功`, icon: 'success'})
            setTimeout(() => Taro.navigateBack(), 1000)
        } catch (error) {
            console.error('保存失败:', error)
            Taro.showToast({title: `${isEditMode ? '更新' : '保存'}失败`, icon: 'none'})
        }
    }

    const updateField = (field: string, value: any) => {
        setFormData(prev => ({...prev, [field]: value}))
    }

    /** 初始化加载 */
    useEffect(() => {
        const init = async () => {
            // 动态设置页面标题
            Taro.setNavigationBarTitle({
                title: isEditMode ? '编辑收货地址' : (fromWxMode ? '完善收货地址' : '新增收货地址'),
            })

            // 微信地址导入
            if (!isEditMode && fromWxMode && !wxDraftPatchedRef.current) {
                try {
                    const draft = Taro.getStorageSync('WxAddressDraft')
                    if (draft) {
                        wxDraftPatchedRef.current = true
                        wxDraftRef.current = draft as any
                        Taro.removeStorageSync('WxAddressDraft')
                        setFormData(prev => ({...prev, ...(draft as any)}))
                        const p = String((draft as any)?.province || '').trim()
                        const c = String((draft as any)?.city || '').trim()
                        const r = String((draft as any)?.region || '').trim()
                        const rText = [p, c, r].filter(Boolean).join(' ')
                        if (rText) setRegionText(rText)
                    }
                } catch (_e) { /* ignore */
                }
            }

            // 编辑模式：加载已有地址数据
            if (isEditMode && addressId) {
                try {
                    const addr = await getShopUserAddress(addressId)
                    setFormData(addr)
                    setRegionText(`${addr.province || ''} ${addr.city || ''} ${addr.region || ''}`)
                    if (hasValidLngLat(addr)) {
                        setSelectedLocation({lng: String(addr.lng), lat: String(addr.lat)})
                        setRegionLocked(true)
                    }
                } catch (error) {
                    console.error('加载地址失败:', error)
                    Taro.showToast({title: '加载地址失败', icon: 'none'})
                }
            }

            setLoading(false)
        }

        init()
    }, [])

    if (loading) {
        return (
            <View className="flex items-center justify-center min-h-screen">
                <Text className="text-gray-400 text-sm">加载中...</Text>
            </View>
        )
    }

    return (
        <View className="min-h-screen bg-gray-50 flex flex-col">
            <ScrollView scrollY className="flex-1">
                {/* 地址智能识别区 */}
                <View className="bg-white px-3 pt-3 pb-2">
                    <View
                        className="rounded-lg p-2 relative"
                        style={{border: '1px dashed #0e932e'}}
                    >
                        <Textarea
                            style={{height: '80px', width: '100%', fontSize: '13px'}}
                            value={inputText}
                            onInput={e => setInputText(e.detail.value)}
                            placeholder="粘贴文本，点击「识别」自动识别收货人、地址、电话"
                            maxlength={200}
                        />
                        <View
                            className="absolute right-2 bottom-2"
                            style={{
                                backgroundColor: '#0e932e',
                                borderRadius: '12px',
                                paddingLeft: '12px',
                                paddingRight: '12px',
                                paddingTop: '4px',
                                paddingBottom: '4px'
                            }}
                            onClick={recognizeAddress}
                        >
                            <Text className="text-white text-xs">识别</Text>
                        </View>
                    </View>
                </View>

                <View className="bg-gray-100" style={{height: '8px'}}/>

                {/* 选择定位 */}
                <View className="bg-white px-4 mb-2">
                    <View className="flex items-center py-3" onClick={chooseGeoLocation}>
                        <View className="flex-1">
                            <View className="flex items-center gap-1 mb-1">
                                <Text className="text-sm text-gray-700">选择定位</Text>
                                <Text className="text-gray-300" style={{fontSize: '10px'}}>（推荐）</Text>
                            </View>
                            <Text className="text-xs text-gray-400">
                                {selectedLocation?.address || (selectedLocation ? `经度：${selectedLocation.lng}, 纬度：${selectedLocation.lat}` : '用于判断是否超出配送范围')}
                            </Text>
                            {selectedLocation?.name && (
                                <Text className="text-xs text-green-600 mt-1">{selectedLocation.name}</Text>
                            )}
                        </View>
                        <Text className="text-gray-300 text-xs">▶</Text>
                    </View>
                </View>

                {/* 表单区 */}
                <View className="bg-white px-4 py-2">

                    {/* 所在地区 */}
                    <View className="flex items-center py-3 border-b border-gray-50" onClick={openRegionPicker}>
                        <Text className="text-sm text-gray-700" style={{minWidth: '60px'}}>所在地区</Text>
                        <View className="flex-1 flex items-center justify-between">
                            <Text className={`text-sm ${regionText ? 'text-gray-800' : 'text-gray-400'}`}>
                                {regionText || '请选择省市区'}
                            </Text>
                            <Text className="text-gray-300 text-xs">▶</Text>
                        </View>
                    </View>

                    {/* 详细地址 */}
                    <View className="flex items-center py-3 border-b border-gray-50">
                        <Text className="text-sm text-gray-700" style={{minWidth: '60px'}}>详细地址</Text>
                        <Input
                            className="flex-1 text-sm"
                            placeholder="请输入详细收货地址"
                            maxLength={50}
                            value={formData.address || ''}
                            onInput={e => updateField('address', e.detail.value)}
                        />
                    </View>

                    {/* 收货人 */}
                    <View className="flex items-center py-3 border-b border-gray-50">
                        <Text className="text-sm text-gray-700" style={{minWidth: '60px'}}>收货人</Text>
                        <Input
                            className="flex-1 text-sm"
                            placeholder="请输入收货人姓名"
                            maxLength={10}
                            value={formData.name || ''}
                            onInput={e => updateField('name', e.detail.value)}
                        />
                    </View>

                    {/* 手机号 */}
                    <View className="flex items-center py-3 border-b border-gray-50">
                        <Text className="text-sm text-gray-700" style={{minWidth: '60px'}}>手机号</Text>
                        <Input
                            className="flex-1 text-sm"
                            placeholder="请输入手机号"
                            type="number"
                            maxlength={11}
                            value={formData.phone || ''}
                            onInput={e => updateField('phone', e.detail.value)}
                        />
                    </View>

                </View>

                {/* 默认地址开关 */}
                <View className="bg-white px-4 mt-2">
                    <View className="flex items-center justify-between py-3">
                        <Text className="text-sm text-gray-700">设为默认地址</Text>
                        <View
                            className={`rounded-full relative ${formData.isDefault ? 'bg-green-500' : 'bg-gray-300'}`}
                            style={{width: '40px', height: '22px'}}
                            onClick={() => updateField('isDefault', !formData.isDefault)}
                        >
                            <View
                                className={`absolute top-1 rounded-full bg-white ${formData.isDefault ? 'right-1' : 'left-1'}`}
                                style={{width: '16px', height: '16px'}}
                            />
                        </View>
                    </View>
                </View>

                {/* 底部占位 */}
                <View style={{height: '100px'}}/>
            </ScrollView>

            {/* 底部保存按钮 - 使用 flex 布局而非 fixed */}
            <View className="bg-white border-t border-gray-200 px-4 py-3" style={{paddingBottom: '20px'}}>
                <View
                    className="py-3 rounded-full text-center"
                    style={{backgroundColor: '#0e932e'}}
                    onClick={handleSave}
                >
                    <Text className="text-white font-medium text-sm">{isEditMode ? '更新地址' : '保存并使用'}</Text>
                </View>
            </View>

            {/* 省市区选择器 */}
            <Address
                visible={regionPickerVisible}
                options={regionOptions}
                title="选择所在地区"
                onChange={(value) => handleRegionChange(value as string[])}
                onClose={() => setRegionPickerVisible(false)}
            />
        </View>
    )
}

export default AddressEditPage