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"
)

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

// ContainerGetByID retrieves a single container by its ID.
//
// @Summary      Get container by ID
// @Description  Retrieve a single container using its unique identifier
// @Tags         container
// @Accept       json
// @Produce      json
// @Param        id   path      int  true  "Container ID"
// @Success      200  {object}  response.SuccessResponse{data=models.Container}
// @Failure      400  {object}  response.ErrorResponse
// @Failure      404  {object}  response.ErrorResponse
// @Failure      500  {object}  response.ErrorResponse
// @Router       /v1/containers/{id} [get]
func ContainerGetByID(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
	}
	container, err := repositories.GetContainerByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to get container by ID: %d", id)
		response.NotFoundError(c, http.StatusNotFound, "Container not found")
		return nil
	}
	response.Ok(c, "Success", container)
	return nil
}

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

// ContainerUpdate updates an existing container by its ID.
// It validates the request body, fetches the existing record,
// merges non-empty fields from the request, and updates the container in the database.
//
// @Summary      Update container
// @Description  Update an existing container by its ID. Only non-empty fields will be updated.
// @Tags         container
// @Accept       json
// @Produce      json
// @Param        id    path      int                           true  "Container ID"
// @Param        body  body      requests.UpdateContainerRequest  true  "Container request body"
// @Success      200   {object}  response.SuccessResponse{data=responses.UpdateContainerResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      404   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /v1/containers/{id} [put]
func ContainerUpdate(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.UpdateContainerRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	existing, err := repositories.GetContainerByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		response.NotFoundError(c, http.StatusNotFound, "Container not found")
		return nil
	}
	if requestBody.Name != "" {
		existing.Name = requestBody.Name
	}
	if requestBody.ContainerType != "" {
		existing.ContainerType = requestBody.ContainerType
	}
	if requestBody.Description != "" {
		existing.Description = requestBody.Description
	}
	if requestBody.MaxCapacity != 0 {
		existing.MaxCapacity = requestBody.MaxCapacity
	}
	if len(requestBody.Metadata) > 0 {
		existing.Metadata = requestBody.Metadata
	}
	existing.UpdatedAt = time.Now()
	container, err := repositories.UpdateContainer(c.Request.Context(), global.Queries, existing)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to update container with ID: %d", id)
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to update container")
		return nil
	}
	response.Ok(c, "Container updated successfully", &responses.UpdateContainerResponse{
		ID:            container.ID,
		ShelfID:       container.ShelfID,
		Name:          container.Name,
		ContainerType: container.ContainerType,
		Description:   container.Description,
		MaxCapacity:   container.MaxCapacity,
		Metadata:      container.Metadata,
	})
	return nil
}

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