package handlers

import (
	"errors"
	"fmt"
	"log/slog"
	q "platform/web/queries"
	"platform/web/services"
	"strconv"
	"strings"

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

// region CreateChannel

type CreateChannelReq struct {
	ResourceId      int32                    `json:"resource_id" validate:"required"`
	Protocol        services.ChannelProtocol `json:"protocol" validate:"required,oneof=socks5 http https"`
	AuthType        services.ChannelAuthType `json:"auth_type" validate:"required,oneof=0 1"`
	Count           int                      `json:"count" validate:"required"`
	Prov            string                   `json:"prov" validate:"required"`
	City            string                   `json:"city" validate:"required"`
	Isp             string                   `json:"isp" validate:"required"`
	ResultType      CreateChannelResultType  `json:"result_type" validate:"required,oneof=json text"`
	ResultBreaker   []rune                   `json:"result_breaker" validate:""`
	ResultSeparator []rune                   `json:"result_separator" validate:""`
}

func CreateChannel(c *fiber.Ctx) error {
	req := new(CreateChannelReq)
	if err := c.BodyParser(req); err != nil {
		return err
	}

	if req.ResultType == "" {
		req.ResultType = CreateChannelResultTypeText
	}
	if req.ResultBreaker == nil {
		req.ResultBreaker = []rune("\r\n")
	}
	if req.ResultSeparator == nil {
		req.ResultSeparator = []rune("|")
	}

	// 建立连接通道
	auth, ok := c.Locals("auth").(*services.AuthContext)
	if !ok {
		return errors.New("user not found")
	}

	result, err := services.Channel.CreateChannel(
		c.Context(),
		auth,
		req.ResourceId,
		req.Protocol,
		req.AuthType,
		req.Count,
		services.NodeFilterConfig{
			Isp:  req.Isp,
			Prov: req.Prov,
			City: req.City,
		},
	)
	if err != nil {
		return err
	}

	var separator = string(req.ResultSeparator)
	switch req.ResultType {
	case CreateChannelResultTypeJson:
		return c.JSON(fiber.Map{
			"code": 1,
			"data": result,
		})
	default:
		var breaker = string(req.ResultBreaker)
		var str = strings.Builder{}
		for _, info := range result {

			str.WriteString(info.Host)

			str.WriteString(separator)
			str.WriteString(strconv.Itoa(info.Port))

			if info.Username != nil {
				str.WriteString(separator)
				str.WriteString(*info.Username)
			}
			if info.Password != nil {
				str.WriteString(separator)
				str.WriteString(*info.Password)
			}
			str.WriteString(breaker)
		}
		return c.SendString(str.String())
	}
}

type CreateChannelResultType string

const (
	CreateChannelResultTypeJson CreateChannelResultType = "json"
	CreateChannelResultTypeText CreateChannelResultType = "text"
)

// endregion

// region RemoveChannels

type RemoveChannelsReq struct {
	ByIds []int32 `json:"by_ids" validate:"required"`
}

func RemoveChannels(c *fiber.Ctx) error {
	req := new(RemoveChannelsReq)
	if err := c.BodyParser(req); err != nil {
		return err
	}

	// 获取用户信息
	auth, ok := c.Locals("auth").(*services.AuthContext)
	if !ok {
		return errors.New("user not found")
	}

	// 删除通道
	err := services.Channel.RemoveChannels(c.Context(), auth, req.ByIds...)
	if err != nil {
		return err
	}

	return c.SendStatus(fiber.StatusOK)
}

// endregion

// region CreateChannel(GET)

type CreateChannelGetReq struct {
	ResourceId      int32                    `query:"i" validate:"required"`
	Protocol        services.ChannelProtocol `query:"x" validate:"required,oneof=socks5 http https"`
	AuthType        services.ChannelAuthType `query:"t" validate:"required,oneof=0 1"`
	Count           int                      `query:"n" validate:"required"`
	Prov            string                   `query:"a" validate:"required"`
	City            string                   `query:"b" validate:"required"`
	Isp             string                   `query:"s" validate:"required"`
	ResultType      CreateChannelResultType  `query:"rt" validate:"required,oneof=json text"`
	ResultBreaker   []rune                   `query:"rb"`
	ResultSeparator []rune                   `query:"rs"`
}

func CreateChannelGet(c *fiber.Ctx) error {
	req := new(CreateChannelGetReq)
	if err := c.QueryParser(req); err != nil {
		return err
	}
	slog.Info("CreateChannelGet", "req", *req)

	// 验证用户身份
	resource, err := q.Resource.Debug().Where(q.Resource.ID.Eq(req.ResourceId)).Take()
	if err != nil {
		return err
	}
	whitelists, err := q.Whitelist.Debug().Where(q.Whitelist.UserID.Eq(resource.UserID)).Find()
	if err != nil {
		return err
	}
	if len(whitelists) == 0 {
		return fiber.NewError(fiber.StatusForbidden, fmt.Sprintf("forbidden %s", c.IP()))
	}

	var invalid bool
	for _, whitelist := range whitelists {
		invalid = whitelist.Host == c.IP()
		if invalid {
			break
		}
	}
	if !invalid {
		return fiber.NewError(fiber.StatusForbidden, fmt.Sprintf("forbidden %s", c.IP()))
	}

	user, err := q.User.Debug().Where(q.User.ID.Eq(resource.UserID)).Take()
	if err != nil {
		return err
	}

	auth := &services.AuthContext{
		Payload: services.Payload{
			Id:     user.ID,
			Type:   services.PayloadUser,
			Name:   user.Name,
			Avatar: user.Avatar,
		},
	}

	if req.ResultType == "" {
		req.ResultType = CreateChannelResultTypeText
	}
	if req.ResultBreaker == nil {
		req.ResultBreaker = []rune("\r\n")
	}
	if req.ResultSeparator == nil {
		req.ResultSeparator = []rune("|")
	}

	// 建立连接通道
	result, err := services.Channel.CreateChannel(
		c.Context(),
		auth,
		req.ResourceId,
		req.Protocol,
		req.AuthType,
		req.Count,
		services.NodeFilterConfig{
			Isp:  req.Isp,
			Prov: req.Prov,
			City: req.City,
		},
	)
	if err != nil {
		return err
	}

	var separator = string(req.ResultSeparator)
	switch req.ResultType {
	case CreateChannelResultTypeJson:
		return c.JSON(fiber.Map{
			"code": 1,
			"data": result,
		})
	default:
		var breaker = string(req.ResultBreaker)
		var str = strings.Builder{}
		for _, info := range result {

			str.WriteString(info.Host)

			str.WriteString(separator)
			str.WriteString(strconv.Itoa(info.Port))

			if info.Username != nil {
				str.WriteString(separator)
				str.WriteString(*info.Username)
			}
			if info.Password != nil {
				str.WriteString(separator)
				str.WriteString(*info.Password)
			}
			str.WriteString(breaker)
		}
		return c.SendString(str.String())
	}
}

// endregion