package useragent

import (
	"net/url"
	"strings"
	"videoweb/pub/common/enum/consts"
	"videoweb/pub/common/log"
	"videoweb/pub/pubdef"

	"github.com/gin-gonic/gin"
)

type UA struct {
	DevID       string
	DevType     string
	SysType     pubdef.SysType
	Ver         string
	BuildID     string
	UserAgent   string
	SDKCommon   *SDKCommonFields // SDK 公共参数独立保存，不能与原业务 UA 字段混用。
	RequestPath string           // 仅用于定位埋点参数缺失的业务接口。
}

func IsH5(sysType pubdef.SysType) bool {
	return sysType.IsH5()
}

func (s UA) IsH5() bool {
	return s.SysType.IsH5()
}

func UserAgent(c *gin.Context) {
	var uastr string
	ua := UA{RequestPath: c.FullPath()}
	var sdkErr error
	ua.SDKCommon, sdkErr = ParseSDKCommonHeader(c.GetHeader(SDKCommonHeader))
	if sdkErr != nil {
		log.Error("【SDK公共参数解析失败】UserAgent", log.Any("接口", ua.RequestPath), log.E(sdkErr))
	}
	userAgent := c.GetHeader("X-User-Agent") //兼容H5 UserAgent
	if userAgent == "" {
		userAgent = c.Request.UserAgent()
	}
	ua.UserAgent = userAgent
	if userAgent != "" {
		// "BuildID=com.abc.Butterfly;SysType=h5;DevID=B9A00938-FE68-4686-9461-A365C7E5110D;Ver=0.0.1;DevType=iPhone;"
		decodeUa, err := url.QueryUnescape(userAgent)
		if err != nil {
			log.Warn("URLDecode user-agent error", log.Any("ua", userAgent))
			uastr = userAgent
		} else {
			uastr = decodeUa
		}
		uas := strings.Split(uastr, ";")
		for _, v := range uas {
			vss := strings.Split(strings.TrimSpace(v), "=")
			if len(vss) < 2 {
				c.Set(consts.CtxUAH5, vss[0])
				// log.Warn("user-agent miss", log.Any("ua", userAgent), log.Any("v", v))
				continue
			}
			switch strings.TrimSpace(vss[0]) {
			case "DevID":
				ua.DevID = strings.TrimSpace(vss[1])
				c.Set(consts.CtxDevId, ua.DevID)
			case "DevType":
				ua.DevType = strings.TrimSpace(vss[1])
				c.Set(consts.CtxDevType, ua.DevType)
			case "SysType":
				input := strings.ToLower(strings.TrimSpace(vss[1]))
				switch {
				case strings.Contains(input, "h5_android"):
					ua.SysType = pubdef.ST_H5Android
				case strings.Contains(input, "h5_ios"):
					ua.SysType = pubdef.ST_H5IOS
				case strings.Contains(input, "h5_pc"):
					ua.SysType = pubdef.ST_H5PC
				case strings.Contains(input, "android"):
					ua.SysType = pubdef.ST_Android
				case strings.Contains(input, "ios"):
					ua.SysType = pubdef.ST_IOS
				case strings.Contains(input, "h5"):
					ua.SysType = pubdef.ST_H5
				case strings.Contains(input, "pc"):
					ua.SysType = pubdef.ST_PC
				case strings.Contains(input, "light"):
					ua.SysType = pubdef.ST_Light
				case strings.Contains(input, "tg"):
					ua.SysType = pubdef.ST_TG
				case strings.Contains(input, "web"):
					ua.SysType = pubdef.ST_Web
				}
				// 存入 context 时用 string，保持 ctx.GetString 兼容
				c.Set(consts.CtxSysType, string(ua.SysType))
			case "Ver":
				ua.Ver = strings.TrimSpace(vss[1])
				c.Set(consts.CtxVersion, ua.Ver)
			case "BuildID":
				ua.BuildID = strings.TrimSpace(vss[1])
				c.Set(consts.CtxBuildId, ua.BuildID)
			default:
				log.Warn("user-agent unknown", log.Any("ua", userAgent))
			}
		}
	} else {
		log.Warn("user-agent empty")
	}
	c.Set(consts.CtxUA, ua)
}