package api

import (
	"strings"
	"time"

	"yunyan/comm"
	"yunyan/lego/sys/log"
	"yunyan/pb"
)

// 渠道商管理：渠道商挂在品牌商下，一个品牌商可绑定多个渠道商，id 为 8 位可读短码。
// 生产授权码时必须选定渠道商，归属随批次写进每条授权码，用户绑定设备后统计与结算按它归属。
//
// 与 console 侧 api_channel.go 是同表同库的两套实现（沿用本仓库品牌商/产品既有的双实现格局），
// 状态取值、审批规则、校验口径两端必须保持一致，改一处要同步另一处。

// 渠道商状态取值（与 DBChannel.status 及前端一致）。
const (
	ChannelStatusPending  int32 = 0 // 待审核
	ChannelStatusEnabled  int32 = 1 // 启用
	ChannelStatusDisabled int32 = 2 // 停用
	ChannelStatusRejected int32 = 3 // 驳回
)

// channelShareRateMax 渠道商分成比例上限（万分比，10000 = 100%）；语义是从品牌商那份里再切。
const channelShareRateMax int32 = 10000

// canAuditChannel 是否有渠道商审批权（超管/管理员）。
func canAuditChannel(session comm.IUserSession) bool {
	identity := pb.Identity(session.GetMateToInt32("identity"))
	return identity == pb.Identity_Admin || identity == pb.Identity_Manager
}

// GetChannels 渠道商列表。status<0 为不限（0 是「待审核」，不能拿零值当全部）。
// 运营/代理按账号的品牌商白名单收敛。
func (this *apiComp) GetChannels(session comm.IUserSession, req *pb.ApiGetChannelsReq) (resp *pb.ApiGetChannelsResp, errdata *pb.ErrorData) {
	models, err := this.module.model.channels(req.Brandid, req.Status, req.Keyword)
	if err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: err.Error()}
		this.module.Error("GetChannels Fail!", log.Field{Key: "err", Value: err.Error()})
		return
	}
	scope := this.getSessionScope(session)
	if !scope.Unlimited {
		allProducts, _ := this.module.model.products()
		allowed := visibleFactoryIDs(scope, allProducts)
		allowSet := make(map[uint32]struct{}, len(allowed))
		for _, id := range allowed {
			allowSet[id] = struct{}{}
		}
		filtered := make([]*pb.DBChannel, 0, len(models))
		for _, m := range models {
			if _, ok := allowSet[m.Brandid]; ok {
				filtered = append(filtered, m)
			}
		}
		models = filtered
	}
	resp = &pb.ApiGetChannelsResp{Channels: models}
	return
}

// GetChannel 取单个渠道商。
func (this *apiComp) GetChannel(session comm.IUserSession, req *pb.ApiGetChannelReq) (resp *pb.ApiGetChannelResp, errdata *pb.ErrorData) {
	id := strings.TrimSpace(req.Id)
	if id == "" {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "id 必填"}
		return
	}
	model, err := this.module.model.channel(id)
	if err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: "渠道商不存在: " + id}
		return
	}
	resp = &pb.ApiGetChannelResp{Channel: model}
	return
}

// AddChannel 新增渠道商。id 一律服务端生成短码（前端传入的忽略）；
// 无审批权的账号（品牌商）提交后为待审核，须超管/管理员通过才能用于生产。
func (this *apiComp) AddChannel(session comm.IUserSession, req *pb.ApiAddChannelReq) (resp *pb.ApiAddChannelResp, errdata *pb.ErrorData) {
	if req.Channel == nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "channel 必填"}
		return
	}
	m := req.Channel
	m.Name = strings.TrimSpace(m.Name)
	if m.Name == "" {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "渠道商名称必填"}
		return
	}
	if m.Brandid == 0 {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "所属品牌商必选"}
		return
	}
	if _, err := this.module.model.factory(m.Brandid); err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "品牌商不存在"}
		return
	}
	if m.Sharerate < 0 || m.Sharerate > channelShareRateMax {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "分成比例需在 0~10000(万分比) 之间"}
		return
	}
	now := time.Now().Unix()
	m.Id = this.module.model.genchannelid()
	m.Createtime = now
	m.Updatetime = now
	if canAuditChannel(session) {
		m.Status = ChannelStatusEnabled
		m.Auditaccount = session.GetUserId()
		m.Audittime = now
	} else {
		m.Status = ChannelStatusPending
		m.Applyaccount = session.GetUserId()
		m.Auditaccount = ""
		m.Audittime = 0
	}
	m.Auditremark = ""
	if err := this.module.model.addchannel(m); err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: err.Error()}
		this.module.Error("AddChannel Fail!", log.Field{Key: "err", Value: err.Error()})
		return
	}
	resp = &pb.ApiAddChannelResp{Channel: m}
	return
}

// UpdateChannel 更新渠道商资料。id/brandid 不可改（改归属与已生产的授权码矛盾）；
// 状态只能走审批接口；分成比例只有有审批权的账号能改。
func (this *apiComp) UpdateChannel(session comm.IUserSession, req *pb.ApiUpdateChannelReq) (resp *pb.ApiUpdateChannelResp, errdata *pb.ErrorData) {
	if req.Channel == nil || strings.TrimSpace(req.Channel.Id) == "" {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "channel id 必填"}
		return
	}
	old, err := this.module.model.channel(strings.TrimSpace(req.Channel.Id))
	if err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: "渠道商不存在: " + req.Channel.Id}
		return
	}
	if req.Channel.Sharerate < 0 || req.Channel.Sharerate > channelShareRateMax {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "分成比例需在 0~10000(万分比) 之间"}
		return
	}
	if name := strings.TrimSpace(req.Channel.Name); name != "" {
		old.Name = name
	}
	old.Contact = req.Channel.Contact
	old.Contactmails = req.Channel.Contactmails
	old.Remark = req.Channel.Remark
	if canAuditChannel(session) {
		old.Sharerate = req.Channel.Sharerate
	}
	old.Updatetime = time.Now().Unix()
	if err = this.module.model.savechannel(old); err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: err.Error()}
		return
	}
	resp = &pb.ApiUpdateChannelResp{Channel: old}
	return
}

// DelChannel 删除渠道商。已产生生产批次的禁止删除——历史授权码/统计/结算都按 id 归属；
// 要停止使用请走审批接口置停用。
func (this *apiComp) DelChannel(session comm.IUserSession, req *pb.ApiDelChannelReq) (resp *pb.ApiDelChannelResp, errdata *pb.ErrorData) {
	id := strings.TrimSpace(req.Id)
	if id == "" {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "id 必填"}
		return
	}
	if _, err := this.module.model.channel(id); err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: "渠道商不存在: " + id}
		return
	}
	n, err := this.module.model.countbatchesbychannel(id)
	if err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: err.Error()}
		return
	}
	if n > 0 {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "该渠道商已有生产批次，不能删除，请改为停用"}
		return
	}
	if err = this.module.model.delchannel(id); err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: err.Error()}
		return
	}
	resp = &pb.ApiDelChannelResp{Id: id}
	return
}

// AuditChannel 审批/启停渠道商：通过(1) / 停用(2) / 驳回(3)。仅超管、管理员。
func (this *apiComp) AuditChannel(session comm.IUserSession, req *pb.ApiAuditChannelReq) (resp *pb.ApiAuditChannelResp, errdata *pb.ErrorData) {
	if !canAuditChannel(session) {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_InsufficientPermissions, Message: "仅超管/管理员可审批渠道商"}
		return
	}
	id := strings.TrimSpace(req.Id)
	if id == "" {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "id 必填"}
		return
	}
	switch req.Status {
	case ChannelStatusEnabled, ChannelStatusDisabled, ChannelStatusRejected:
	default:
		errdata = &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "status 仅支持 1(通过启用) / 2(停用) / 3(驳回)"}
		return
	}
	old, err := this.module.model.channel(id)
	if err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: "渠道商不存在: " + id}
		return
	}
	old.Status = req.Status
	old.Auditaccount = session.GetUserId()
	old.Auditremark = req.Auditremark
	old.Audittime = time.Now().Unix()
	old.Updatetime = old.Audittime
	if err = this.module.model.savechannel(old); err != nil {
		errdata = &pb.ErrorData{Code: pb.ErrorCode_DBError, Message: err.Error()}
		return
	}
	resp = &pb.ApiAuditChannelResp{Channel: old}
	return
}

// resolveProductionChannel 生产授权码时解析并校验渠道商：必选、须归属该品牌商、须为启用状态。
// 返回渠道商与错误数据（errdata 非空即校验失败，调用方直接 return）。
func (this *apiComp) resolveProductionChannel(channelid string, brandid uint32) (*pb.DBChannel, *pb.ErrorData) {
	id := strings.TrimSpace(channelid)
	if id == "" {
		return nil, &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "渠道商必选"}
	}
	ch, err := this.module.model.channel(id)
	if err != nil {
		return nil, &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "渠道商不存在: " + id}
	}
	if ch.Brandid != brandid {
		return nil, &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "渠道商不属于该品牌商: " + id}
	}
	if ch.Status != ChannelStatusEnabled {
		return nil, &pb.ErrorData{Code: pb.ErrorCode_ReqParameterError, Message: "渠道商未启用（待审核/停用/驳回），不能用于生产: " + id}
	}
	return ch, nil
}