package handlers

import (
	"net"
	"platform/web/auth"
	"platform/web/core"
	g "platform/web/globals"
	m "platform/web/models"
	q "platform/web/queries"
	"time"

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

type ListWhitelistReq struct {
	core.PageReq
}

type ListWhitelistResp struct {
	Total int64          `json:"total"`
	List  []*m.Whitelist `json:"list"`
	Page  int            `json:"page"`
	Size  int            `json:"size"`
}

func ListWhitelist(c *fiber.Ctx) error {

	// 检查权限
	authContext, err := auth.Protect(c, []auth.PayloadType{auth.PayloadUser}, []string{})
	if err != nil {
		return err
	}

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

	// 获取白名单信息
	do := q.Whitelist.
		Where(q.Whitelist.UserID.Eq(authContext.Payload.Id))

	list, err := q.Whitelist.Where(do).
		Offset(req.GetOffset()).
		Limit(req.GetLimit()).
		Order(q.Whitelist.CreatedAt.Desc()).
		Find()
	if err != nil {
		return err
	}

	var total int64
	if len(list) < req.GetLimit() {
		total = int64(len(list) + req.GetOffset())
	} else {
		total, err = q.Whitelist.Where(do).Count()
		if err != nil {
			return err
		}
	}

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

type CreateWhitelistReq struct {
	Host   string `json:"host" validate:"required,ip"`
	Remark string `json:"remark,omitempty"`
}

func CreateWhitelist(c *fiber.Ctx) error {

	// 检查权限
	authContext, err := auth.Protect(c, []auth.PayloadType{auth.PayloadUser}, []string{})
	if err != nil {
		return err
	}

	// 解析请求参数
	req := new(CreateWhitelistReq)
	err = g.Validator.Validate(c, req)
	if err != nil {
		return err
	}

	err = secureAddr(req.Host)
	if err != nil {
		return err
	}

	// 创建白名单
	err = q.Whitelist.Create(&m.Whitelist{
		UserID: authContext.Payload.Id,
		Host:   req.Host,
		Remark: &req.Remark,
	})
	return nil
}

type UpdateWhitelistReq struct {
	ID     int32  `json:"id" validate:"required"`
	Host   string `json:"host"`
	Remark string `json:"remark"`
}

func UpdateWhitelist(c *fiber.Ctx) error {
	// 检查权限
	authContext, err := auth.Protect(c, []auth.PayloadType{auth.PayloadUser}, []string{})
	if err != nil {
		return err
	}

	// 解析请求参数
	req := new(UpdateWhitelistReq)
	if err := c.BodyParser(req); err != nil {
		return err
	}
	if req.ID == 0 {
		return fiber.NewError(fiber.StatusBadRequest, "id is required")
	}

	// 更新白名单
	_, err = q.Whitelist.
		Where(
			q.Whitelist.ID.Eq(req.ID),
			q.Whitelist.UserID.Eq(authContext.Payload.Id),
		).
		Updates(&m.Whitelist{
			ID:     req.ID,
			Host:   req.Host,
			Remark: &req.Remark,
		})
	if err != nil {
		return err
	}
	return nil
}

type RemoveWhitelistReq struct {
	ID int32 `json:"id" validate:"required"`
}

func RemoveWhitelist(c *fiber.Ctx) error {

	// 检查权限
	authContext, err := auth.Protect(c, []auth.PayloadType{auth.PayloadUser}, []string{})
	if err != nil {
		return err
	}

	// 解析请求参数
	var req []RemoveWhitelistReq
	if err := c.BodyParser(&req); err != nil {
		return err
	}
	if len(req) == 0 {
		return fiber.NewError(fiber.StatusBadRequest, "id is required")
	}

	var ids = make([]int32, len(req))
	for i, item := range req {
		if item.ID == 0 {
			return fiber.NewError(fiber.StatusBadRequest, "id is required")
		}
		ids[i] = item.ID
	}

	// 删除白名单
	_, err = q.Whitelist.
		Where(
			q.Whitelist.ID.In(ids...),
			q.Whitelist.UserID.Eq(authContext.Payload.Id),
		).
		Update(
			q.Whitelist.DeletedAt, time.Now(),
		)
	if err != nil {
		return err
	}
	return nil
}

func secureAddr(str string) error {
	var addr = net.ParseIP(str)
	if addr == nil {
		return fiber.NewError(fiber.StatusBadRequest, "IP 解析失败")
	}

	if addr.IsGlobalUnicast() {
		return nil
	}
	return fiber.NewError(fiber.StatusBadRequest, "IP 地址不可用")
}