package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
	"github.com/gochat/gochat/pkg/pagination"
	"github.com/gochat/gochat/pkg/response"
)

// FolderHandler handles Folder CRUD endpoints.
type FolderHandler struct {
	svc *service.FolderService
}

// NewFolderHandler creates a new FolderHandler.
func NewFolderHandler(svc *service.FolderService) *FolderHandler {
	return &FolderHandler{svc: svc}
}

// Create creates a new folder.
// POST /api/v1/accounts/:account_id/portals/:portal_id/folders
func (h *FolderHandler) Create(c *gin.Context) {
	portalID, err := strconv.ParseUint(c.Param("portal_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid portal_id")
		return
	}

	var req service.CreateFolderRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	folder, err := h.svc.Create(c.Request.Context(), uint(portalID), &req)
	if err != nil {
		applogger.L().Errorf("Create folder: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to create folder")
		return
	}

	response.Created(c, folder)
}

// Get retrieves a folder by ID.
// GET /api/v1/accounts/:account_id/portals/:portal_id/folders/:folder_id
func (h *FolderHandler) Get(c *gin.Context) {
	folderID, err := strconv.ParseUint(c.Param("folder_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid folder_id")
		return
	}

	folder, err := h.svc.GetByID(c.Request.Context(), uint(folderID))
	if err != nil {
		applogger.L().Errorf("Get folder: %v", err)
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrNotFound, "folder not found")
		return
	}

	response.OK(c, folder)
}

// Update modifies an existing folder.
// PUT /api/v1/accounts/:account_id/portals/:portal_id/folders/:folder_id
func (h *FolderHandler) Update(c *gin.Context) {
	folderID, err := strconv.ParseUint(c.Param("folder_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid folder_id")
		return
	}

	var req service.UpdateFolderRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	folder, err := h.svc.Update(c.Request.Context(), uint(folderID), &req)
	if err != nil {
		applogger.L().Errorf("Update folder: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to update folder")
		return
	}

	response.OK(c, folder)
}

// Delete removes a folder.
// DELETE /api/v1/accounts/:account_id/portals/:portal_id/folders/:folder_id
func (h *FolderHandler) Delete(c *gin.Context) {
	folderID, err := strconv.ParseUint(c.Param("folder_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid folder_id")
		return
	}

	if err := h.svc.Delete(c.Request.Context(), uint(folderID)); err != nil {
		applogger.L().Errorf("Delete folder: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to delete folder")
		return
	}

	response.NoContent(c)
}

// List returns all folders for a portal (paginated).
// GET /api/v1/accounts/:account_id/portals/:portal_id/folders
func (h *FolderHandler) List(c *gin.Context) {
	portalID, err := strconv.ParseUint(c.Param("portal_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid portal_id")
		return
	}

	pg := pagination.Parse(c)
	folders, count, err := h.svc.ListByPortalID(c.Request.Context(), uint(portalID), pg.Page, pg.PerPage)
	if err != nil {
		applogger.L().Errorf("List folders: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to list folders")
		return
	}

	response.OKWithMeta(c, folders, pg.Page, pg.PerPage, count)
}