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"
)

// InvoiceCreate creates a new invoice.
//
// @Summary      Create a new invoice
// @Description  Create a new invoice with the provided details
// @Tags         invoice
// @Accept       json
// @Produce      json
// @Param        body  body  requests.CreateInvoiceRequest  true  "Invoice request body"
// @Success      201   {object}  response.SuccessResponse{data=responses.CreateInvoiceResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /v1/invoices [post]
func InvoiceCreate(c *gin.Context) error {
	requestBody := requests.CreateInvoiceRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	invoiceModel := &models.Invoice{
		Type:            requestBody.Type,
		Status:          requestBody.Status,
		InvoiceConfigID: requestBody.InvoiceConfigID,
		TotalItems:      requestBody.TotalItems,
		Note:            requestBody.Note,
		CreatedBy:       requestBody.CreatedBy,
		ApprovedBy:      requestBody.ApprovedBy,
		CreatedAt:       time.Now(),
	}
	invoice, err := repositories.CreateInvoice(c.Request.Context(), global.Queries, *invoiceModel)
	if err != nil {
		log.Error().Err(err).Msg("Failed to create invoice")
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to create invoice")
		return nil
	}
	response.Created(c, "Invoice created successfully", &responses.CreateInvoiceResponse{
		ID:          invoice.ID,
		InvoiceCode: invoice.InvoiceCode,
	})
	return nil
}

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

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

// InvoiceUpdate updates an existing invoice by its ID.
//
// @Summary      Update invoice
// @Description  Update an existing invoice by its ID. Only non-empty fields will be updated.
// @Tags         invoice
// @Accept       json
// @Produce      json
// @Param        id    path      int                            true  "Invoice ID"
// @Param        body  body      requests.UpdateInvoiceRequest  true  "Invoice request body"
// @Success      200   {object}  response.SuccessResponse{data=responses.UpdateInvoiceResponse}
// @Failure      400   {object}  response.ErrorResponse
// @Failure      404   {object}  response.ErrorResponse
// @Failure      500   {object}  response.ErrorResponse
// @Router       /v1/invoices/{id} [put]
func InvoiceUpdate(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.UpdateInvoiceRequest{}
	if helper.IsShouldBindJSON(c, &requestBody) {
		return nil
	}
	existing, err := repositories.GetInvoiceByID(c.Request.Context(), global.Queries, id)
	if err != nil {
		response.NotFoundError(c, http.StatusNotFound, "Invoice not found")
		return nil
	}
	if requestBody.Type != nil {
		existing.Type = *requestBody.Type
	}
	if requestBody.Status != nil {
		existing.Status = *requestBody.Status
	}
	if requestBody.InvoiceConfigID != nil {
		existing.InvoiceConfigID = *requestBody.InvoiceConfigID
	}
	if requestBody.TotalItems != nil {
		existing.TotalItems = *requestBody.TotalItems
	}
	if requestBody.Note != "" {
		existing.Note = requestBody.Note
	}
	existing.UpdatedAt = time.Now()
	invoice, err := repositories.UpdateInvoice(c.Request.Context(), global.Queries, existing)
	if err != nil {
		log.Error().Err(err).Msgf("Failed to update invoice with ID: %d", id)
		response.InternalServerError(c, http.StatusInternalServerError, "Failed to update invoice")
		return nil
	}
	response.Ok(c, "Invoice updated successfully", &responses.UpdateInvoiceResponse{
		ID:              invoice.ID,
		InvoiceCode:     invoice.InvoiceCode,
		Type:            invoice.Type,
		Status:          invoice.Status,
		InvoiceConfigID: invoice.InvoiceConfigID,
		TotalItems:      invoice.TotalItems,
		Note:            invoice.Note,
	})
	return nil
}

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