package handlers

import (
	"net/netip"
	"platform/pkg/u"
	"platform/web/auth"
	"platform/web/core"
	g "platform/web/globals"
	m "platform/web/models"
	q "platform/web/queries"
	s "platform/web/services"
	"time"

	"github.com/gofiber/fiber/v2"
)

// region ListChannels

type ListChannelsReq struct {
	core.PageReq
	AuthType     s.ChannelAuthType `json:"auth_type"`
	ExpireAfter  *time.Time        `json:"expire_after"`
	ExpireBefore *time.Time        `json:"expire_before"`
}

func ListChannels(c *fiber.Ctx) error {
	// 检查权限
	authContext, err := auth.GetAuthCtx(c).PermitUser()
	if err != nil {
		return err
	}

	// 解析请求参数
	req := new(ListChannelsReq)
	if err := c.BodyParser(req); err != nil {
		return err
	}

	// 构造查询条件
	cond := q.Channel.
		Where(q.Channel.UserID.Eq(authContext.User.ID))
	switch req.AuthType {
	case s.ChannelAuthTypeIp:
		cond.Where(q.Channel.Whitelists.IsNotNull())
	case s.ChannelAuthTypePass:
		cond.Where(q.Channel.Username.IsNotNull(), q.Channel.Password.IsNotNull())
	default:
		break
	}

	if req.ExpireAfter != nil {
		cond.Where(q.Channel.ExpiredAt.Gte(*req.ExpireAfter))
	}
	if req.ExpireBefore != nil {
		cond.Where(q.Channel.ExpiredAt.Lte(*req.ExpireBefore))
	}

	// 查询数据
	channels, err := q.Channel.
		Where(cond).
		Order(q.Channel.CreatedAt.Desc()).
		Offset(req.GetOffset()).
		Limit(req.GetLimit()).
		Find()
	if err != nil {
		return err
	}

	// 查询总量
	var total int64
	if len(channels) < req.GetLimit() {
		total = int64(len(channels) + req.GetOffset())
	} else {
		total, err = q.Channel.Where(cond).Count()
		if err != nil {
			return err
		}
	}

	// 返回结果
	return c.JSON(core.PageResp{
		Total: int(total),
		Page:  req.GetPage(),
		Size:  req.GetSize(),
		List:  channels,
	})
}

// endregion

// region CreateChannel

type CreateChannelReq struct {
	ResourceId int32             `json:"resource_id" validate:"required"`
	AuthType   s.ChannelAuthType `json:"auth_type" validate:"required"`
	Protocol   int               `json:"protocol" validate:"required"`
	Count      int               `json:"count" validate:"required"`
	Prov       *string           `json:"prov"`
	City       *string           `json:"city"`
	Isp        *int              `json:"isp"`
}

type CreateChannelRespItem struct {
	Proto    int     `json:"-"`
	Host     string  `json:"host"`
	Port     uint16  `json:"port"`
	Username *string `json:"username,omitempty"`
	Password *string `json:"password,omitempty"`
}

func CreateChannel(c *fiber.Ctx) error {

	// 解析参数
	req := new(CreateChannelReq)
	if err := g.Validator.ParseBody(c, req); err != nil {
		return core.NewBizErr("解析参数失败", err)
	}

	ip, err := netip.ParseAddr(c.IP())
	if err != nil {
		return core.NewBizErr("获取客户端地址失败", err)
	}

	// 创建通道
	result, err := s.Channel.CreateChannels(
		ip,
		req.ResourceId,
		req.AuthType == s.ChannelAuthTypeIp,
		req.AuthType == s.ChannelAuthTypePass,
		req.Count,
		s.EdgeFilter{
			Isp:  u.ElseTo(req.Isp, m.ToEdgeISP),
			Prov: req.Prov,
			City: req.City,
		},
	)
	if err != nil {
		return err
	}

	// 返回结果
	var resp = make([]*CreateChannelRespItem, len(result))
	for i, channel := range result {
		resp[i] = &CreateChannelRespItem{
			Proto: req.Protocol,
			Host:  channel.Host,
			Port:  channel.Port,
		}
		if req.AuthType == s.ChannelAuthTypePass {
			resp[i].Username = channel.Username
			resp[i].Password = channel.Password
		}
	}
	return c.JSON(resp)
}

type CreateChannelResultType string

// endregion

// region RemoveChannels

type RemoveChannelsReq struct {
	Batch string `json:"batch" validate:"required"`
}

func RemoveChannels(c *fiber.Ctx) error {
	// 检查权限
	_, err := auth.GetAuthCtx(c).PermitOfficialClient()
	if err != nil {
		return err
	}

	// 解析请求参数
	req := new(RemoveChannelsReq)
	if err := c.BodyParser(req); err != nil {
		return err
	}

	// 删除通道
	err = s.Channel.RemoveChannels(req.Batch)
	if err != nil {
		return err
	}

	return c.SendStatus(fiber.StatusOK)
}

// endregion