package handler

import (
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"

	"apskel-pos-be/internal/appcontext"
	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/logger"
	"apskel-pos-be/internal/models"
	"apskel-pos-be/internal/service"
	"apskel-pos-be/internal/util"
	"apskel-pos-be/internal/validator"
)

// WalletAdminHandler serves /marketing/customers/:id/wallet (docs/prd-point-coin.md F7).
type WalletAdminHandler struct {
	walletAdminService service.WalletAdminService
	walletValidator    validator.WalletValidator
}

func NewWalletAdminHandler(walletAdminService service.WalletAdminService, walletValidator validator.WalletValidator) *WalletAdminHandler {
	return &WalletAdminHandler{walletAdminService: walletAdminService, walletValidator: walletValidator}
}

func (h *WalletAdminHandler) GetCustomerWallet(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	customerID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid customer ID"),
		}), "WalletAdminHandler::GetCustomerWallet")
		return
	}

	var query models.ListCustomerWalletTransactionsQuery
	if err := c.ShouldBindQuery(&query); err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, err.Error()),
		}), "WalletAdminHandler::GetCustomerWallet")
		return
	}

	response := h.walletAdminService.GetCustomerWallet(ctx, contextInfo, customerID, query)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("WalletAdminHandler::GetCustomerWallet -> service call failed")
	}
	util.HandleResponse(c.Writer, c.Request, response, "WalletAdminHandler::GetCustomerWallet")
}

func (h *WalletAdminHandler) AdjustCustomerWallet(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	customerID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid customer ID"),
		}), "WalletAdminHandler::AdjustCustomerWallet")
		return
	}

	var req contract.AdjustCustomerWalletRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, err.Error()),
		}), "WalletAdminHandler::AdjustCustomerWallet")
		return
	}
	if validationError, code := h.walletValidator.ValidateAdjustRequest(&req); validationError != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(code, constants.RequestEntity, validationError.Error()),
		}), "WalletAdminHandler::AdjustCustomerWallet")
		return
	}

	response := h.walletAdminService.AdjustCustomerWallet(ctx, contextInfo, customerID, &req)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("WalletAdminHandler::AdjustCustomerWallet -> service call failed")
	}
	util.HandleResponse(c.Writer, c.Request, response, "WalletAdminHandler::AdjustCustomerWallet")
}