package services

import (
	"net/http"
	"strconv"
	"time"
	"wm-backend/global"
	"wm-backend/internal/models"
	"wm-backend/internal/models/requests"
	"wm-backend/internal/models/responses"
	"wm-backend/internal/repositories"
	"wm-backend/pkg/helper"
	"wm-backend/response"

	"github.com/gin-gonic/gin"
	"github.com/rs/zerolog/log"
)

// ShelveCreate creates a new shelve.
// It validates the request body and creates the shelve in the database.
//
// @Summary      Create a new shelve
// @Description  Create a new shelve with the provided details
// @Tags         shelve
// @Accept       json
// @Produce      json
// @Param        body  body  requests.CreateShelveRequest  true  "Shelve request body"
// @Success      201   {object}  response.SuccessResponse{data=responses.CreateShelveResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /v1/shelves [post]
func ShelveCreate(c *gin.Context) error {
	requestBody := requests.CreateShelveRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	shelveModel := &models.Shelve{
		CabinetID:   requestBody.CabinetID,
		Name:        requestBody.Name,
		LevelIndex:  requestBody.LevelIndex,
		Description: requestBody.Description,
		CreatedAt:   time.Now(),
	}
	shelve, err := repositories.CreateShelve(c.Request.Context(), global.Queries, *shelveModel)
	if err != nil {
		log.Error().Err(err).Msg("Failed to create shelve")
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to create shelve")
		return nil
	}
	response.Created(c, "Shelve created successfully", &responses.CreateShelveResponse{
		ID: shelve.ID,
	})
	return nil
}

// ShelveGetByID retrieves a single shelve by its ID.
//
// @Summary      Get shelve by ID
// @Description  Retrieve a single shelve using its unique identifier
// @Tags         shelve
// @Accept       json
// @Produce      json
// @Param        id   path      int  true  "Shelve ID"
// @Success      200  {object}  response.SuccessResponse{data=models.Shelve}
// @Failure      400  {object}  response.ErrorResponse
// @Failure      404  {object}  response.ErrorResponse
// @Failure      500  {object}  response.ErrorResponse
// @Router       /v1/shelves/{id} [get]
func ShelveGetByID(c *gin.Context) error {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.BadRequestError(c, http.StatusBadRequest, "Invalid ID")
		return nil
	}
	shelve, err := repositories.GetShelveByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to get shelve by ID: %d", id)
		response.NotFoundError(c, http.StatusNotFound, "Shelve not found")
		return nil
	}
	response.Ok(c, "Success", shelve)
	return nil
}

// ShelveList retrieves all shelves.
//
// @Summary      List all shelves
// @Description  Retrieve a list of all shelves ordered by creation date
// @Tags         shelve
// @Accept       json
// @Produce      json
// @Success      200  {object}  response.SuccessResponse{data=[]models.Shelve}
// @Failure      500  {object}  response.ErrorResponse
// @Router       /v1/shelves [get]
func ShelveList(c *gin.Context) error {
	shelves, err := repositories.ListShelves(c.Request.Context(), global.Queries)
	if err != nil {
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to list shelves")
		return nil
	}
	response.Ok(c, "Success", shelves)
	return nil
}

// ShelveUpdate updates an existing shelve by its ID.
// It validates the request body, fetches the existing record,
// merges non-empty fields from the request, and updates the shelve in the database.
//
// @Summary      Update shelve
// @Description  Update an existing shelve by its ID. Only non-empty fields will be updated.
// @Tags         shelve
// @Accept       json
// @Produce      json
// @Param        id    path      int                          true  "Shelve ID"
// @Param        body  body      requests.UpdateShelveRequest true  "Shelve request body"
// @Success      200   {object}  response.SuccessResponse{data=responses.UpdateShelveResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      404   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /v1/shelves/{id} [put]
func ShelveUpdate(c *gin.Context) error {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.BadRequestError(c, http.StatusBadRequest, "Invalid ID")
		return nil
	}
	requestBody := requests.UpdateShelveRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	existing, err := repositories.GetShelveByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		response.NotFoundError(c, http.StatusNotFound, "Shelve not found")
		return nil
	}
	if requestBody.Name != "" {
		existing.Name = requestBody.Name
	}
	if requestBody.LevelIndex != 0 {
		existing.LevelIndex = requestBody.LevelIndex
	}
	if requestBody.Description != "" {
		existing.Description = requestBody.Description
	}
	existing.UpdatedAt = time.Now()
	shelve, err := repositories.UpdateShelve(c.Request.Context(), global.Queries, existing)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to update shelve with ID: %d", id)
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to update shelve")
		return nil
	}
	response.Ok(c, "Shelve updated successfully", &responses.UpdateShelveResponse{
		ID:          shelve.ID,
		CabinetID:   shelve.CabinetID,
		Name:        shelve.Name,
		LevelIndex:  shelve.LevelIndex,
		Description: shelve.Description,
	})
	return nil
}

// ShelveDelete deletes a shelve by its ID.
//
// @Summary      Delete shelve
// @Description  Delete a shelve by its unique identifier
// @Tags         shelve
// @Accept       json
// @Produce      json
// @Param        id   path      int  true  "Shelve ID"
// @Success      200  {object}  response.SuccessResponse
// @Failure      400  {object}  response.ErrorResponse
// @Failure      500  {object}  response.ErrorResponse
// @Router       /v1/shelves/{id} [delete]
func ShelveDelete(c *gin.Context) error {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		response.BadRequestError(c, http.StatusBadRequest, "Invalid ID")
		return nil
	}
	rowsAffected, err := repositories.DeleteShelve(c.Request.Context(), global.Queries, id)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to delete shelve with ID: %d", id)
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to delete shelve")
		return nil
	}
	if rowsAffected == 0 {
		response.NotFoundError(c, http.StatusNotFound, "Shelve not found")
		return nil
	}
	response.Ok(c, "Delete Success", nil)
	return nil
}