package projects

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
	"senlinai-agent/backend/internal/httpx"
)

// ChannelHandler owns project-scoped custom-link writes.
type ChannelHandler struct {
	service *Service
}

func NewChannelHandler(service *Service) *ChannelHandler {
	return &ChannelHandler{service: service}
}

func (h *ChannelHandler) Register(router gin.IRouter) {
	router.POST("/projects/:id/channels", h.create)
}

func (h *ChannelHandler) create(c *gin.Context) {
	userID, project, ok := ownedProjectFromRequest(c)
	if !ok {
		return
	}
	var input CreateProjectChannelInput
	if err := c.ShouldBindJSON(&input); err != nil {
		httpx.Error(c, http.StatusBadRequest, "invalid_request", "频道参数无效")
		return
	}
	channel, err := h.service.CreateProjectChannel(userID, project.ID, input)
	if err != nil {
		switch {
		case errors.Is(err, ErrChannelTitleRequired), errors.Is(err, ErrChannelURLRequired), errors.Is(err, ErrChannelURLInvalid):
			httpx.Error(c, http.StatusBadRequest, "invalid_request", "频道名称和链接地址不能为空")
		case errors.Is(err, gorm.ErrRecordNotFound):
			httpx.Error(c, http.StatusNotFound, "not_found", "项目不存在")
		default:
			httpx.Error(c, http.StatusInternalServerError, "internal_error", "频道创建失败")
		}
		return
	}
	c.JSON(http.StatusCreated, WorkspaceChannelDTO{
		ID: channel.Identity, ProjectID: project.Identity, Type: "custom_link", Title: channel.Title,
		Icon: channel.Icon, URL: channel.URL, SortOrder: channel.SortOrder,
	})
}