package fqapi

import (
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"fanqie/internal/common"
	"fanqie/internal/config"
	"fmt"
	"math/big"
	"net"
	"os"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"time"

	"github.com/google/uuid"
)

// 使用共享的设备配置
var (
	androidVersions = DeviceConfig.AndroidVersions
	brandModels     = DeviceConfig.BrandModels
	deviceBrands    = DeviceConfig.DeviceBrands
)

// generateUUID 生成UUID4字符串
func generateUUID() string {
	return uuid.New().String()
}

// currentMillis 返回当前毫秒级时间戳
func currentMillis() int64 {
	return time.Now().UnixNano() / int64(time.Millisecond)
}

// getCustomBT 获取设备开机时间戳
// 模拟 Android 中的 m25453o() 方法，计算设备开机时间戳：
// custom_bt = current_millis - elapsed_ms_since_boot
func getCustomBT() string {
	var uptimeSeconds float64

	if runtime.GOOS == "linux" {
		// 在Linux上读取/proc/uptime
		data, err := os.ReadFile("/proc/uptime")
		if err == nil {
			// /proc/uptime格式: "系统运行时间(秒) 空闲时间(秒)"
			parts := strings.Split(string(data), " ")
			if len(parts) > 0 {
				uptime, err := strconv.ParseFloat(strings.TrimSpace(parts[0]), 64)
				if err == nil {
					uptimeSeconds = uptime
				}
			}
		}

		// 如果读取失败，使用time.monotonic作为备选
		if uptimeSeconds == 0 {
			// Go没有直接的monotonic API，使用启动时间估算
			uptimeSeconds = float64(time.Now().Unix() % 86400)
		}
	} else {
		// 非Linux系统，使用估算值
		// 这里可以使用进程启动时间作为近似
		uptimeSeconds = float64(time.Now().Unix() % 86400)
	}

	return fmt.Sprintf("%d", currentMillis()-int64(uptimeSeconds*1000))
}

// generateDeviceInfo 随机生成设备及操作系统信息
func generateDeviceInfo() map[string]interface{} {
	osVersion := androidVersions[randInt(len(androidVersions))]

	// 随机选择品牌
	deviceBrand := deviceBrands[randInt(len(deviceBrands))]

	// 根据品牌选择对应的型号
	models := brandModels[deviceBrand]
	deviceModel := models[randInt(len(models))]

	releaseBytes := make([]byte, 7)
	rand.Read(releaseBytes)
	releaseBuild := hex.EncodeToString(releaseBytes)

	openUDIDBytes := make([]byte, 10)
	rand.Read(openUDIDBytes)

	return map[string]interface{}{
		"os":                  "Android",
		"os_version":          osVersion[0],
		"os_api":              osVersion[1],
		"device_model":        deviceModel,
		"device_brand":        deviceBrand,
		"device_manufacturer": deviceBrand,
		"cpu_abi":             "arm64-v8a",
		"release_build":       releaseBuild,
		"cdid":                generateUUID(),
		"sig_hash":            "a4a27c2633195374c15651ffc3c4a497",
		"openudid":            hex.EncodeToString(openUDIDBytes),
		"clientudid":          generateUUID(),
		"req_id":              generateUUID(),
	}
}

// randInt 生成随机整数
func randInt(max int) int {
	n, _ := rand.Int(rand.Reader, big.NewInt(int64(max)))
	return int(n.Int64())
}

// randomString 生成随机字符串
func randomString(length int) string {
	const charset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
	b := make([]byte, length)
	for i := range b {
		n, _ := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
		b[i] = charset[n.Int64()]
	}
	return string(b)
}

// generateOptionalFields 生成ROM信息等
func generateOptionalFields() (map[string]interface{}, map[string]int64) {
	rom := randomString(14)
	part1 := randomString(4)
	part2 := randomString(6)
	part3 := randomString(8)

	genTime := currentMillis()
	return map[string]interface{}{
			"rom":                    rom,
			"rom_version":            fmt.Sprintf("coloros__%s.%s.%s release-keys", part1, part2, part3),
			"apk_first_install_time": genTime - int64(randInt(365))*86400000,
		}, map[string]int64{
			"_gen_time": genTime,
		}
}

// generateIPv6AddressLinkLocal 生成链路本地IPv6地址
func generateIPv6AddressLinkLocal() string {
	ifaces, err := net.Interfaces()
	if err != nil {
		return "::1"
	}

	for _, iface := range ifaces {
		addrs, err := iface.Addrs()
		if err != nil {
			continue
		}
		for _, addr := range addrs {
			ipNet, ok := addr.(*net.IPNet)
			if !ok {
				continue
			}
			ip := ipNet.IP
			if ip.To16() != nil && strings.HasPrefix(ip.String(), "fe80::") {
				return strings.Split(ip.String(), "%")[0]
			}
		}
	}
	return "::1"
}

// generateIPv6AddressUniqueLocal 生成唯一本地IPv6地址
func generateIPv6AddressUniqueLocal() string {
	b := make([]byte, 1)
	rand.Read(b)
	parts := []string{fmt.Sprintf("fd%02x", b[0])}
	for i := 0; i < 7; i++ {
		b := make([]byte, 2)
		rand.Read(b)
		parts = append(parts, fmt.Sprintf("%04x", uint16(b[0])<<8|uint16(b[1])))
	}
	return strings.Join(parts, ":")
}

// generateIPv6List 生成IPv6列表
func generateIPv6List() []map[string]string {
	return []map[string]string{
		{"type": "client_anpi", "value": generateIPv6AddressLinkLocal()},
		{"type": "client_anpi", "value": generateIPv6AddressUniqueLocal()},
		{"type": "client_anpi", "value": generateIPv6AddressUniqueLocal()},
	}
}

// deviceIdentity 注册设备身份：pad（默认，历史行为）/ phone（对齐手机 App 书源注册 payload）
func deviceIdentity() string {
	if cfg := config.GetConfig(); cfg != nil && cfg.Fanqie.DeviceIdentity == "phone" {
		return "phone"
	}
	return "pad"
}

// deviceCustomFields 注册身份对应的 custom 字段
func deviceCustomFields() map[string]interface{} {
	if deviceIdentity() == "phone" {
		return map[string]interface{}{"host_bit": 64, "dragon_device_type": "phone"}
	}
	return map[string]interface{}{"host_bit": 32, "dragon_device_type": "pad"}
}

// GenerateFullRequestBody 生成完整的请求体数据
func GenerateFullRequestBody() map[string]interface{} {
	rawData := map[string]interface{}{
		"magic_tag": "ss_app_log",
		"header": map[string]interface{}{
			"display_name":          "番茄免费小说",
			"aid":                   1967,
			"channel":               "43536163a",
			"package":               "com.dragon.read",
			"sdk_version":           "3.7.0-rc.25-fanqie-xiaoshuo",
			"sdk_target_version":    29,
			"git_hash":              "711d1a7",
			"density_dpi":           240,
			"display_density":       "hdpi",
			"resolution":            "720x1280",
			"language":              "zh",
			"timezone":              8,
			"access":                "wifi",
			"not_request_sender":    0,
			"carrier":               "CHINA MOBILE",
			"mcc_mnc":               "46000",
			"region":                "CN",
			"tz_name":               "Asia/Shanghai",
			"tz_offset":             28800,
			"sim_region":            "cn",
			"sim_serial_number":     []interface{}{},
			"oaid_may_support":      false,
			"device_platform":       "android",
			"custom":                deviceCustomFields(),
			"pre_installed_channel": "",
			"is_system_app":         0,
			"sdk_flavor":            "china",
			"guest_mode":            0,
		},
	}

	deviceInfo := generateDeviceInfo()
	optionalFields, genTime := generateOptionalFields()

	header := rawData["header"].(map[string]interface{})
	for k, v := range deviceInfo {
		header[k] = v
	}
	for k, v := range optionalFields {
		header[k] = v
	}
	header["ipv6_list"] = generateIPv6List()

	// phone 身份补充真机指纹字段（对齐书源注册 payload，规避 pad 身份的差异化风控）
	if deviceIdentity() == "phone" {
		rom, _ := header["rom"].(string)
		header["hardware"] = "qcom"
		header["device_device"] = rom
		header["fingerprint"] = fmt.Sprintf("%v/%v/%v:%v/%s/%s:user/release-keys",
			header["device_brand"], header["device_model"], header["device_model"],
			header["os_version"], rom, rom)
	}

	for k, v := range genTime {
		rawData[k] = v
	}

	return rawData
}

// tryActivatePremium 尝试激活设备特权
func tryActivatePremium(header string) {
	logger := common.NewLogger("device_register", "INFO", "")

	// 构建查询参数
	baseParams := []string{
		"aid=1967",
		"app_name=novelapp",
		"channel=0",
		"device_platform=android",
		"os_version=0",
		"version_code=" + ClientVersionCode,
		"manifest_version_code=" + ClientVersionCode,
		"update_version_code=" + ClientVersionCode,
		header,
	}

	// 合并并排序参数
	allParams := strings.Join(baseParams, "&")
	paramList := strings.Split(allParams, "&")
	sort.Strings(paramList)
	sortedParams := strings.Join(paramList, "&")

	requestBody := map[string]interface{}{
		"add_count_daily": 0,
		"amount":          2592000,
		"privilege_id":    7210376203117531962,
		"from":            8,
		"unique_key":      fmt.Sprintf("%d", time.Now().UnixNano()/1e6),
	}

	bodyJSON, _ := json.Marshal(requestBody)

	url := "https://reading.snssdk.com/reading/user/privilege/add/v/?" + sortedParams

	resp, err := GorgonRequestSync(url, map[string]interface{}{
		"method": "post",
		"headers": map[string]string{
			"content-type": "application/json",
		},
		"body": bodyJSON,
	})

	if err != nil {
		logger.Error("激活特权失败: " + err.Error())
		return
	}

	var result map[string]interface{}
	json.Unmarshal(resp.Content, &result)

	if code, ok := result["code"].(float64); ok && code == 0 {
		logger.Info("已成功激活设备特权")
	} else {
		logger.Warning("设备特权激活失败...")
	}
}

// Register 设备注册
func Register() (string, error) {
	logger := common.NewLogger("device_register", "INFO", "")

	logger.Info("正在注册设备...")

	// 生成完整请求体数据
	data := GenerateFullRequestBody()

	// 只记录关键设备信息
	header := data["header"].(map[string]interface{})
	logger.Info(fmt.Sprintf("生成设备信息 - 品牌: %s, 型号: %s, 系统: Android %v",
		header["device_brand"],
		header["device_model"],
		header["os_version"]))

	jsonData, err := json.Marshal(data)
	if err != nil {
		logger.Error("JSON序列化失败: " + err.Error())
		return "", err
	}

	// 使用TTEncrypt加密
	encrypted, err := TTEncrypt(jsonData)
	if err != nil {
		logger.Error("加密失败: " + err.Error())
		return "", err
	}

	url := "https://i.snssdk.com/service/2/device_register/?tt_data=a"
	headers := map[string]string{
		"user-agent":   "okhttp/4.10.0",
		"content-type": "application/octet-stream; tt-data=a",
	}

	client := common.NewHTTPClient()
	resp, err := client.Post(url, encrypted, headers)
	if err != nil {
		logger.Warning("设备注册失败！")
		logger.Warning(err.Error())
		return "", fmt.Errorf("设备注册错误")
	}

	var respData map[string]interface{}
	err = json.Unmarshal(resp.Content, &respData)
	if err != nil {
		logger.Error("响应解析失败: " + err.Error())
		return "", err
	}

	if resp.Status == 200 {
		// 检查device_id
		deviceID, ok := respData["device_id"]
		if !ok {
			logger.Warning("设备注册失败！响应中没有device_id")
			return "", fmt.Errorf("设备注册失败")
		}

		// 转换device_id为float64并检查
		deviceIDFloat, ok := deviceID.(float64)
		if !ok || deviceIDFloat == 0 {
			logger.Warning("设备注册失败！device_id无效")
			return "", fmt.Errorf("设备注册失败")
		}

		deviceModel := data["header"].(map[string]interface{})["device_model"].(string)
		header := fmt.Sprintf("device_id=%v&device_type=%s&iid=%v&version_name="+ClientVersionName,
			respData["device_id_str"],
			deviceModel,
			respData["install_id_str"])

		logger.Info("设备注册成功！")

		// 尝试激活特权
		tryActivatePremium(header)

		return header, nil
	}

	logger.Warning("设备注册失败！")
	return "", fmt.Errorf("设备注册失败")
}