package v1

import (
	"net/http"

	"github.com/gin-gonic/gin"

	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
)

// UploadHandler handles file upload endpoints (account-level + widget direct + account direct).
type UploadHandler struct {
	svc *service.UploadService
}

// NewUploadHandler creates a new UploadHandler.
func NewUploadHandler(svc *service.UploadService) *UploadHandler {
	return &UploadHandler{svc: svc}
}

// Upload handles POST /api/v1/accounts/:id/upload — account-level file upload.
// Reference: Chatwoot api/v1/accounts/:account_id/upload
func (h *UploadHandler) Upload(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "account_id is required")
		return
	}

	fileHeader, err := c.FormFile("file")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "file is required")
		return
	}

	result, svcErr := h.svc.AccountUpload(c.Request.Context(), accountID, service.AccountUploadRequest{
		FileHeader: fileHeader,
	})
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, result)
}

// DirectUpload handles POST /api/v1/widget/direct_uploads — widget direct file upload.
// Reference: Chatwoot POST /widget/direct_uploads
func (h *UploadHandler) DirectUpload(c *gin.Context) {
	fileHeader, err := c.FormFile("file")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "file is required")
		return
	}

	result, svcErr := h.svc.WidgetDirectUpload(c.Request.Context(), service.WidgetDirectUploadRequest{
		FileHeader: fileHeader,
	})
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, result)
}

// AccountDirectUpload handles POST /api/v1/accounts/:id/direct_uploads — account-level staged upload.
// Returns a blob/UUID for later attachment to messages.
// Reference: Chatwoot POST /api/v1/accounts/:account_id/direct_uploads
func (h *UploadHandler) AccountDirectUpload(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "account_id is required")
		return
	}

	fileHeader, err := c.FormFile("file")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, "file is required")
		return
	}

	result, svcErr := h.svc.AccountDirectUpload(c.Request.Context(), accountID, service.AccountDirectUploadRequest{
		FileHeader: fileHeader,
	})
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, result)
}