package handler

import (
	"strconv"

	"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/models"
	"apskel-pos-be/internal/service"
	"apskel-pos-be/internal/util"
)

// CustomerPinHandler serves /customer/pin and the dashboard's PIN endpoints
// (docs/prd-point-coin.md F11). Request bodies hold PINs, so nothing here logs a body,
// and binding errors are reported without the values sent.
type CustomerPinHandler struct {
	pinService service.CustomerPinService
}

func NewCustomerPinHandler(pinService service.CustomerPinService) *CustomerPinHandler {
	return &CustomerPinHandler{pinService: pinService}
}

func (h *CustomerPinHandler) Status(c *gin.Context) {
	customerID, ok := customerIDFromGin(c, "CustomerPinHandler::Status")
	if !ok {
		return
	}
	util.HandleResponse(c.Writer, c.Request, h.pinService.Status(c.Request.Context(), customerID), "CustomerPinHandler::Status")
}

func (h *CustomerPinHandler) RequestOtp(c *gin.Context) {
	customerID, ok := customerIDFromGin(c, "CustomerPinHandler::RequestOtp")
	if !ok {
		return
	}
	var req contract.RequestPinOtpRequest
	if !bindPinRequest(c, &req, "CustomerPinHandler::RequestOtp") {
		return
	}
	util.HandleResponse(c.Writer, c.Request, h.pinService.RequestOtp(c.Request.Context(), customerID, &req), "CustomerPinHandler::RequestOtp")
}

func (h *CustomerPinHandler) CreatePin(c *gin.Context) {
	customerID, ok := customerIDFromGin(c, "CustomerPinHandler::CreatePin")
	if !ok {
		return
	}
	var req contract.CreateCustomerPinRequest
	if !bindPinRequest(c, &req, "CustomerPinHandler::CreatePin") {
		return
	}
	util.HandleResponse(c.Writer, c.Request, h.pinService.CreatePin(c.Request.Context(), customerID, &req, pinRequestInfo(c)), "CustomerPinHandler::CreatePin")
}

func (h *CustomerPinHandler) ChangePin(c *gin.Context) {
	customerID, ok := customerIDFromGin(c, "CustomerPinHandler::ChangePin")
	if !ok {
		return
	}
	var req contract.ChangeCustomerPinRequest
	if !bindPinRequest(c, &req, "CustomerPinHandler::ChangePin") {
		return
	}
	util.HandleResponse(c.Writer, c.Request, h.pinService.ChangePin(c.Request.Context(), customerID, &req, pinRequestInfo(c)), "CustomerPinHandler::ChangePin")
}

func (h *CustomerPinHandler) ResetPin(c *gin.Context) {
	customerID, ok := customerIDFromGin(c, "CustomerPinHandler::ResetPin")
	if !ok {
		return
	}
	var req contract.ResetCustomerPinRequest
	if !bindPinRequest(c, &req, "CustomerPinHandler::ResetPin") {
		return
	}
	util.HandleResponse(c.Writer, c.Request, h.pinService.ResetPin(c.Request.Context(), customerID, &req, pinRequestInfo(c)), "CustomerPinHandler::ResetPin")
}

// RemovePin is DELETE /marketing/customers/:id/pin.
func (h *CustomerPinHandler) RemovePin(c *gin.Context) {
	customerID, ok := parseUUIDParam(c, "id", "CustomerPinHandler::RemovePin")
	if !ok {
		return
	}
	var req contract.RemoveCustomerPinRequest
	if !bindPinRequest(c, &req, "CustomerPinHandler::RemovePin") {
		return
	}
	ctx := c.Request.Context()
	util.HandleResponse(c.Writer, c.Request, h.pinService.RemovePin(ctx, appcontext.FromGinContext(ctx), customerID, &req, pinRequestInfo(c)), "CustomerPinHandler::RemovePin")
}

// ListSecurityEvents is GET /marketing/customers/:id/security-events.
func (h *CustomerPinHandler) ListSecurityEvents(c *gin.Context) {
	customerID, ok := parseUUIDParam(c, "id", "CustomerPinHandler::ListSecurityEvents")
	if !ok {
		return
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "20"))
	ctx := c.Request.Context()
	util.HandleResponse(c.Writer, c.Request, h.pinService.ListSecurityEvents(ctx, appcontext.FromGinContext(ctx), customerID, page, limit), "CustomerPinHandler::ListSecurityEvents")
}

// bindPinRequest binds a JSON body. The error it reports names what is wrong, never the
// values, since those can be PINs.
func bindPinRequest(c *gin.Context, req interface{}, method string) bool {
	if err := c.ShouldBindJSON(req); err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, "invalid request body: required fields are missing or have the wrong type"),
		}), method)
		return false
	}
	return true
}

// customerIDFromGin reads the customer set by CustomerAuthMiddleware.
func customerIDFromGin(c *gin.Context, method string) (uuid.UUID, bool) {
	raw, _ := c.Get("customer_id")
	s, _ := raw.(string)
	id, err := uuid.Parse(s)
	if err != nil {
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{
			contract.NewResponseError(constants.ValidationErrorCode, constants.AuthHandlerEntity, "Customer ID not found"),
		}), method)
		return uuid.Nil, false
	}
	return id, true
}

func pinRequestInfo(c *gin.Context) models.CustomerPinRequestInfo {
	return models.CustomerPinRequestInfo{IPAddress: c.ClientIP(), UserAgent: c.Request.UserAgent()}
}

// IssuePaymentCode is POST /customer/wallet/payment-code.
func (h *CustomerPinHandler) IssuePaymentCode(c *gin.Context) {
	customerID, ok := customerIDFromGin(c, "CustomerPinHandler::IssuePaymentCode")
	if !ok {
		return
	}
	var req contract.IssuePaymentCodeRequest
	if !bindPinRequest(c, &req, "CustomerPinHandler::IssuePaymentCode") {
		return
	}
	util.HandleResponse(c.Writer, c.Request, h.pinService.IssuePaymentCode(c.Request.Context(), customerID, &req, pinRequestInfo(c)), "CustomerPinHandler::IssuePaymentCode")
}