package controllers

import (
	"encoding/json"
	"io"
	"strconv"
	"strings"

	"server/models"
	"server/pkg/identity"
	"server/pkg/jwtutil"
	"server/services"
	authsvc "server/services/auth"

	beego "github.com/beego/beego/v2/server/web"
)

// BackendTenantApplyController 租户端「加入申请」审批
// 数据按 JWT tid 隔离：只处理目标企业为本租户的 join 申请。
type BackendTenantApplyController struct {
	beego.Controller
}

func (c *BackendTenantApplyController) backendClaims() (*jwtutil.Claims, error) {
	return identity.Claims(c.Ctx.Request.Header.Get("Authorization"), identity.EndBackend)
}

func (c *BackendTenantApplyController) jsonErr(httpStatus, bizCode int, msg string) {
	c.Ctx.Output.SetStatus(httpStatus)
	c.Data["json"] = map[string]interface{}{"code": bizCode, "msg": msg}
	_ = c.ServeJSON()
}

func (c *BackendTenantApplyController) readJSON(v interface{}) bool {
	body := c.Ctx.Input.RequestBody
	if len(body) == 0 {
		var err error
		body, err = io.ReadAll(c.Ctx.Request.Body)
		if err != nil || len(body) == 0 {
			c.jsonErr(400, 400, "参数错误")
			return false
		}
	}
	if err := json.Unmarshal(body, v); err != nil {
		c.jsonErr(400, 400, "参数错误")
		return false
	}
	return true
}

// reviewerName 当前审核人姓名（租户用户表 name，兜底 JWT username）
func (c *BackendTenantApplyController) reviewerName(claims *jwtutil.Claims) string {
	var row models.SystemTenantUser
	if err := models.Orm.QueryTable(new(models.SystemTenantUser)).
		Filter("tid", claims.TenantId).
		Filter("uid", claims.UserID).
		Filter("delete_time__isnull", true).
		One(&row); err == nil && row.Name != nil && strings.TrimSpace(*row.Name) != "" {
		return strings.TrimSpace(*row.Name)
	}
	return claims.Username
}

// List GET /backend/tenantApplies?page=1&pageSize=20&status=
func (c *BackendTenantApplyController) List() {
	claims, err := c.backendClaims()
	if err != nil {
		code := identity.Status(err)
		c.jsonErr(code, code, err.Error())
		return
	}
	tid := uint64(claims.TenantId)
	if tid == 0 {
		c.jsonErr(403, 403, "无租户信息")
		return
	}

	page, _ := c.GetInt("page", 1)
	pageSize, _ := c.GetInt("pageSize", 20)
	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 20
	}
	var status *int8
	if s := strings.TrimSpace(c.GetString("status")); s != "" {
		if v, e := strconv.ParseInt(s, 10, 8); e == nil {
			tmp := int8(v)
			status = &tmp
		}
	}

	rows, total, err := services.ListTenantAppliesForTenant(tid, status, page, pageSize)
	if err != nil {
		c.jsonErr(500, 500, "获取申请列表失败")
		return
	}

	// 补充申请人展示信息（昵称 / 手机号）
	type applyDTO struct {
		models.AuthTenantApply
		IdentityNickname string `json:"identity_nickname"`
		IdentityMobile   string `json:"identity_mobile"`
	}
	list := make([]applyDTO, 0, len(rows))
	for _, r := range rows {
		dto := applyDTO{AuthTenantApply: r}
		if identity, ierr := authsvc.GetIdentityByID(r.IdentityID); ierr == nil && identity != nil {
			if identity.Nickname != nil {
				dto.IdentityNickname = *identity.Nickname
			}
			if identity.Mobile != nil {
				dto.IdentityMobile = *identity.Mobile
			}
		}
		list = append(list, dto)
	}

	c.Data["json"] = map[string]interface{}{
		"code": 200,
		"msg":  "success",
		"data": map[string]interface{}{"list": list, "total": total},
	}
	_ = c.ServeJSON()
}

// Approve POST /backend/tenantApplies/approve/:id
func (c *BackendTenantApplyController) Approve() {
	claims, err := c.backendClaims()
	if err != nil {
		code := identity.Status(err)
		c.jsonErr(code, code, err.Error())
		return
	}
	tid := uint64(claims.TenantId)
	applyID, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || applyID == 0 {
		c.jsonErr(400, 400, "无效ID")
		return
	}
	if err := services.ApproveJoinApply(applyID, tid, uint64(claims.UserID), c.reviewerName(claims)); err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}
	c.Data["json"] = map[string]interface{}{"code": 200, "msg": "已通过，申请人已加入本企业"}
	_ = c.ServeJSON()
}

// Reject POST /backend/tenantApplies/reject/:id  { reason }
func (c *BackendTenantApplyController) Reject() {
	claims, err := c.backendClaims()
	if err != nil {
		code := identity.Status(err)
		c.jsonErr(code, code, err.Error())
		return
	}
	tid := uint64(claims.TenantId)
	applyID, err := strconv.ParseUint(c.Ctx.Input.Param(":id"), 10, 64)
	if err != nil || applyID == 0 {
		c.jsonErr(400, 400, "无效ID")
		return
	}
	var req struct {
		Reason string `json:"reason"`
	}
	if !c.readJSON(&req) {
		return
	}
	if err := services.RejectJoinApply(applyID, tid, uint64(claims.UserID), c.reviewerName(claims), strings.TrimSpace(req.Reason)); err != nil {
		c.jsonErr(400, 400, err.Error())
		return
	}
	c.Data["json"] = map[string]interface{}{"code": 200, "msg": "已驳回"}
	_ = c.ServeJSON()
}