package promocode

import (
	"codeword/internal/models"
	"codeword/internal/repository"
	"codeword/internal/services"
	"errors"
	"github.com/gofiber/fiber/v2"
	"go.uber.org/zap"
)

type Deps struct {
	Logger           *zap.Logger
	PromoCodeService *services.PromoCodeService
	AuthMiddleware   func(*fiber.Ctx) error
}

type PromoCodeController struct {
	logger           *zap.Logger
	promoCodeService *services.PromoCodeService
	authMiddleware   func(*fiber.Ctx) error
}

func NewPromoCodeController(deps Deps) *PromoCodeController {
	return &PromoCodeController{
		logger:           deps.Logger,
		promoCodeService: deps.PromoCodeService,
		authMiddleware:   deps.AuthMiddleware,
	}
}

func (p *PromoCodeController) CreatePromoCode(c *fiber.Ctx) error {
	var req models.PromoCode
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request payload"})
	}

	if req.Codeword == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "codeword is required"})
	}

	createdPromoCode, err := p.promoCodeService.CreatePromoCode(c.Context(), &req)
	if err != nil {
		p.logger.Error("Failed to create promocode", zap.Error(err))

		if errors.Is(err, repository.ErrDuplicateCodeword) {
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Duplicate Codeword"})
		}

		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	return c.Status(fiber.StatusOK).JSON(createdPromoCode)
}

func (p *PromoCodeController) EditPromoCode(c *fiber.Ctx) error {
	var req models.ReqEditPromoCode
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request payload"})
	}

	if req.ID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "promocode ID is required"})
	}

	editedPromoCode, err := p.promoCodeService.EditPromoCode(c.Context(), &req)
	if err != nil {
		p.logger.Error("Failed to edit promocode", zap.Error(err))

		if errors.Is(err, repository.ErrPromoCodeNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "PromoCode not found"})
		}

		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	return c.Status(fiber.StatusOK).JSON(editedPromoCode)
}

func (p *PromoCodeController) GetList(c *fiber.Ctx) error {
	var req models.GetPromoCodesListReq
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request payload"})
	}

	promoCodes, count, err := p.promoCodeService.GetPromoCodesList(c.Context(), &req)
	if err != nil {
		p.logger.Error("Failed to retrieve promocode list", zap.Error(err))
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	resp := models.GetPromoCodesListResp{
		Count: count,
		Items: promoCodes,
	}
	return c.Status(fiber.StatusOK).JSON(resp)
}

func (p *PromoCodeController) Activate(c *fiber.Ctx) error {
	err := p.authMiddleware(c)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err})
	}

	userID := c.Locals(models.AuthJWTDecodedUserIDKey).(string)
	if userID == "" {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"error": "failed to get jwt payload"})
	}

	var req models.ActivateReq
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request payload"})
	}

	if req.Codeword == "" && req.FastLink == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "codeword or fastlink is required"})
	}

	greetings, err := p.promoCodeService.ActivatePromo(c.Context(), &req, userID)
	if err != nil {
		p.logger.Error("Failed to activate promocode", zap.Error(err))

		switch {
		case errors.Is(err, repository.ErrPromoCodeNotFound):
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "PromoCode not found"})
		case errors.Is(err, repository.ErrPromoCodeAlreadyActivated):
			return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "PromoCode already activated"})
		case errors.Is(err, repository.ErrPromoCodeExpired):
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": err.Error()})
		case errors.Is(err, repository.ErrPromoCodeExhausted):
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "PromoCode exhausted"})
		default:
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
		}
	}

	return c.Status(fiber.StatusOK).JSON(models.ActivateResp{Greetings: greetings})
}

func (p *PromoCodeController) Delete(c *fiber.Ctx) error {
	promoCodeID := c.Params("promocodeID")

	if promoCodeID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "PromoCode ID is required"})
	}

	err := p.promoCodeService.DeletePromoCode(c.Context(), promoCodeID)
	if err != nil {
		p.logger.Error("Failed to delete promocode", zap.Error(err))

		if errors.Is(err, repository.ErrPromoCodeNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "PromoCode not found"})
		}

		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	return c.SendStatus(fiber.StatusOK)
}

func (p *PromoCodeController) CreateFastLink(c *fiber.Ctx) error {
	var req struct {
		PromoCodeID string `json:"id"`
	}
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request payload"})
	}

	if req.PromoCodeID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "PromoCode ID is required"})
	}

	fastLink, err := p.promoCodeService.CreateFastLink(c.Context(), req.PromoCodeID)
	if err != nil {
		p.logger.Error("Failed to create fastlink", zap.Error(err))

		if errors.Is(err, repository.ErrPromoCodeNotFound) {
			return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "PromoCode not found"})
		}

		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	return c.Status(fiber.StatusCreated).JSON(fiber.Map{"fastlink": fastLink})
}

func (p *PromoCodeController) GetStats(c *fiber.Ctx) error {
	var req struct {
		PromoCodeID string `json:"id"`
	}

	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Invalid request payload"})
	}

	if req.PromoCodeID == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "PromoCode ID is required"})
	}

	promoStats, err := p.promoCodeService.GetStats(c.Context(), req.PromoCodeID)
	if err != nil {
		p.logger.Error("Failed getting promo stats", zap.Error(err))
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}
	return c.Status(fiber.StatusOK).JSON(promoStats)
}