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"
)

// ComponentCreate creates a new component.
// It validates the request body and creates the component in the database.
//
// @Summary      Create a new component
// @Description  Create a new component with the provided details
// @Tags         component
// @Accept       json
// @Produce      json
// @Param        body  body  requests.CreateComponentRequest  true  "Component request body"
// @Success      201   {object}  response.SuccessResponse{data=responses.CreateComponentResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /api/v1/components [post]
func ComponentCreate(c *gin.Context) error {
	requestBody := requests.CreateComponentRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	componentModel := &models.Component{
		ComponentTypeID: requestBody.ComponentTypeID,
		Name:            requestBody.Name,
		Description:     requestBody.Description,
		Unit:            requestBody.Unit,
		MinQuantity:     requestBody.MinQuantity,
		Metadata:        requestBody.Metadata,
		CreatedAt:       time.Now(),
	}
	component, err := repositories.CreateComponent(c.Request.Context(), global.Queries, *componentModel)
	if err != nil {
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to create component")
		return nil
	}
	response.Created(c, "Component created successfully", &responses.CreateComponentResponse{
		ID: component.ID,
	})
	return nil
}

// ComponentGetByID retrieves a single component by its ID.
//
// @Summary      Get component by ID
// @Description  Retrieve a single component using its unique identifier
// @Tags         component
// @Accept       json
// @Produce      json
// @Param        id   path      int  true  "Component ID"
// @Success      200  {object}  response.SuccessResponse{data=models.Component}
// @Failure      400  {object}  response.ErrorResponse
// @Failure      404  {object}  response.ErrorResponse
// @Failure      500  {object}  response.ErrorResponse
// @Router       /api/v1/components/{id} [get]
func ComponentGetByID(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
	}
	component, err := repositories.GetComponentByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		response.NotFoundError(c, http.StatusNotFound, "Component not found")
		return nil
	}
	response.Ok(c, "Success", component)
	return nil
}

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

// ComponentUpdate updates an existing component by its ID.
// It validates the request body, fetches the existing record,
// merges non-empty fields from the request, and updates the component in the database.
//
// @Summary      Update component
// @Description  Update an existing component by its ID. Only non-empty fields will be updated.
// @Tags         component
// @Accept       json
// @Produce      json
// @Param        id    path      int                            true  "Component ID"
// @Param        body  body      requests.UpdateComponentRequest  true  "Component request body"
// @Success      200   {object}  response.SuccessResponse{data=responses.UpdateComponentResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      404   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /api/v1/components/{id} [put]
func ComponentUpdate(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.UpdateComponentRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	existing, err := repositories.GetComponentByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		response.NotFoundError(c, http.StatusNotFound, "Component not found")
		return nil
	}
	if requestBody.ComponentTypeID != 0 {
		existing.ComponentTypeID = requestBody.ComponentTypeID
	}
	if requestBody.Name != "" {
		existing.Name = requestBody.Name
	}
	if requestBody.Description != "" {
		existing.Description = requestBody.Description
	}
	if requestBody.Unit != "" {
		existing.Unit = requestBody.Unit
	}
	if requestBody.MinQuantity != 0 {
		existing.MinQuantity = requestBody.MinQuantity
	}
	if len(requestBody.Metadata) > 0 {
		existing.Metadata = requestBody.Metadata
	}
	existing.UpdatedAt = time.Now()
	component, err := repositories.UpdateComponent(c.Request.Context(), global.Queries, existing)
	if err != nil {
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to update component")
		return nil
	}
	response.Ok(c, "Component updated successfully", &responses.UpdateComponentResponse{
		ID:              component.ID,
		ComponentTypeID: component.ComponentTypeID,
		Name:            component.Name,
		Description:     component.Description,
		Unit:            component.Unit,
		MinQuantity:     component.MinQuantity,
	})
	return nil
}

// ComponentDelete deletes a component by its ID.
//
// @Summary      Delete component
// @Description  Delete a component by its unique identifier
// @Tags         component
// @Accept       json
// @Produce      json
// @Param        id   path      int  true  "Component ID"
// @Success      200  {object}  response.SuccessResponse
// @Failure      400  {object}  response.ErrorResponse
// @Failure      500  {object}  response.ErrorResponse
// @Router       /api/v1/components/{id} [delete]
func ComponentDelete(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.DeleteComponent(c.Request.Context(), global.Queries, id)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to delete component with ID: %d", id)
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to delete component")
		return nil
	}
	if rowsAffected == 0 {
		response.NotFoundError(c, http.StatusNotFound, "Component not found")
		return nil
	}
	response.Ok(c, "Delete Success", nil)
	return nil
}