package handlers

import (
	"errors"
	"log/slog"
	"time"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/services/user"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/web_server/response"
	customvalidator "github.com/SamuelTariku/FortuneBet-Backend/internal/web_server/validator"

	"github.com/gofiber/fiber/v2"
)

type CheckPhoneEmailExistReq struct {
	Email       string `json:"email" example:"john.doe@example.com"`
	PhoneNumber string `json:"phone_number" example:"1234567890"`
}
type CheckPhoneEmailExistRes struct {
	EmailExist       bool `json:"email_exist"`
	PhoneNumberExist bool `json:"phone_number_exist"`
}

// CheckPhoneEmailExist godoc
// @Summary Check if phone number or email exist
// @Description Check if phone number or email exist
// @Tags user
// @Accept json
// @Produce json
// @Param checkPhoneEmailExist body CheckPhoneEmailExistReq true "Check phone number or email exist"
// @Success 200 {object} CheckPhoneEmailExistRes
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /user/checkPhoneEmailExist [post]
func CheckPhoneEmailExist(logger *slog.Logger, userSvc *user.Service,
	validator *customvalidator.CustomValidator) fiber.Handler {
	return func(c *fiber.Ctx) error {
		var req CheckPhoneEmailExistReq
		if err := c.BodyParser(&req); err != nil {
			logger.Error("CheckPhoneEmailExist failed", "error", err)
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": "Invalid request",
			})
		}
		valErrs, ok := validator.Validate(c, req)
		if !ok {
			response.WriteJSON(c, fiber.StatusBadRequest, "Invalid request", valErrs, nil)
			return nil
		}
		emailExist, phoneExist, err := userSvc.CheckPhoneEmailExist(c.Context(), req.PhoneNumber, req.Email)
		if err != nil {
			logger.Error("CheckPhoneEmailExist failed", "error", err)
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
				"error": "Internal server error",
			})
		}
		res := CheckPhoneEmailExistRes{
			EmailExist:       emailExist,
			PhoneNumberExist: phoneExist,
		}
		return response.WriteJSON(c, fiber.StatusOK, "Check Success", res, nil)
	}
}

type RegisterCodeReq struct {
	Email       string `json:"email" example:"john.doe@example.com"`
	PhoneNumber string `json:"phone_number" example:"1234567890"`
}

// SendRegisterCode godoc
// @Summary Send register code
// @Description Send register code
// @Tags user
// @Accept json
// @Produce json
// @Param registerCode body RegisterCodeReq true "Send register code"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /user/sendRegisterCode [post]
func SendRegisterCode(logger *slog.Logger, userSvc *user.Service,
	validator *customvalidator.CustomValidator) fiber.Handler {
	return func(c *fiber.Ctx) error {
		var req RegisterCodeReq
		if err := c.BodyParser(&req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": "Invalid request",
			})
		}
		valErrs, ok := validator.Validate(c, req)
		if !ok {
			response.WriteJSON(c, fiber.StatusBadRequest, "Invalid request", valErrs, nil)
			return nil
		}
		var sentTo string
		var medium domain.OtpMedium
		if req.Email != "" {
			sentTo = req.Email
			medium = domain.OtpMediumEmail
		}
		if req.PhoneNumber != "" {
			sentTo = req.PhoneNumber
			medium = domain.OtpMediumSms
		}
		if err := userSvc.SendRegisterCode(c.Context(), medium, sentTo); err != nil {
			logger.Error("SendRegisterCode failed", "error", err)
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
				"error": "Internal server error",
			})
		}
		return response.WriteJSON(c, fiber.StatusOK, "Code sent successfully", nil, nil)
	}
}

type RegisterUserReq struct {
	FirstName   string `json:"first_name" example:"John"`
	LastName    string `json:"last_name" example:"Doe"`
	Email       string `json:"email" example:"john.doe@example.com"`
	PhoneNumber string `json:"phone_number" example:"1234567890"`
	Password    string `json:"password" example:"password123"`
	//Role        string
	Otp         string `json:"otp" example:"123456"`
	ReferalCode string `json:"referal_code" example:"ABC123"`
	//

}

// RegisterUser godoc
// @Summary Register user
// @Description Register user
// @Tags user
// @Accept json
// @Produce json
// @Param registerUser body RegisterUserReq true "Register user"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /user/register [post]
func RegisterUser(logger *slog.Logger, userSvc *user.Service,
	validator *customvalidator.CustomValidator) fiber.Handler {
	return func(c *fiber.Ctx) error {
		var req RegisterUserReq
		if err := c.BodyParser(&req); err != nil {
			logger.Error("RegisterUser failed", "error", err)
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": "Invalid request",
			})
		}
		valErrs, ok := validator.Validate(c, req)
		if !ok {
			response.WriteJSON(c, fiber.StatusBadRequest, "Invalid request", valErrs, nil)
			return nil
		}
		user := domain.RegisterUserReq{
			FirstName:   req.FirstName,
			LastName:    req.LastName,
			Email:       req.Email,
			PhoneNumber: req.PhoneNumber,
			Password:    req.Password,
			Otp:         req.Otp,
			ReferalCode: req.ReferalCode,
			OtpMedium:   domain.OtpMediumEmail,
		}
		medium, err := getMedium(req.Email, req.PhoneNumber)
		if err != nil {
			logger.Error("RegisterUser failed", "error", err)
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": err.Error(),
			})
		}
		user.OtpMedium = medium
		if _, err := userSvc.RegisterUser(c.Context(), user); err != nil {
			if errors.Is(err, domain.ErrOtpAlreadyUsed) {
				return response.WriteJSON(c, fiber.StatusBadRequest, "Otp already used", nil, nil)
			}
			if errors.Is(err, domain.ErrOtpExpired) {
				return response.WriteJSON(c, fiber.StatusBadRequest, "Otp expired", nil, nil)
			}
			if errors.Is(err, domain.ErrInvalidOtp) {
				return response.WriteJSON(c, fiber.StatusBadRequest, "Invalid otp", nil, nil)
			}
			if errors.Is(err, domain.ErrOtpNotFound) {
				return response.WriteJSON(c, fiber.StatusBadRequest, "User already exist", nil, nil)
			}
			logger.Error("RegisterUser failed", "error", err)
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
				"error": "Internal server error",
			})
		}
		return response.WriteJSON(c, fiber.StatusOK, "Registration successful", nil, nil)
	}
}

type ResetCodeReq struct {
	Email       string `json:"email" example:"john.doe@example.com"`
	PhoneNumber string `json:"phone_number" example:"1234567890"`
}

// SendResetCode godoc
// @Summary Send reset code
// @Description Send reset code
// @Tags user
// @Accept json
// @Produce json
// @Param resetCode body ResetCodeReq true "Send reset code"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /user/sendResetCode [post]
func SendResetCode(logger *slog.Logger, userSvc *user.Service,
	validator *customvalidator.CustomValidator) fiber.Handler {
	return func(c *fiber.Ctx) error {
		var req ResetCodeReq
		if err := c.BodyParser(&req); err != nil {
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": "Invalid request",
			})
		}
		valErrs, ok := validator.Validate(c, req)
		if !ok {
			response.WriteJSON(c, fiber.StatusBadRequest, "Invalid request", valErrs, nil)
			return nil
		}
		var sentTo string
		var medium domain.OtpMedium
		if req.Email != "" {
			sentTo = req.Email
			medium = domain.OtpMediumEmail
		}
		if req.PhoneNumber != "" {
			sentTo = req.PhoneNumber
			medium = domain.OtpMediumSms
		}
		if err := userSvc.SendResetCode(c.Context(), medium, sentTo); err != nil {
			logger.Error("SendResetCode failed", "error", err)
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
				"error": "Internal server error",
			})
		}
		return response.WriteJSON(c, fiber.StatusOK, "Code sent successfully", nil, nil)

	}
}

type ResetPasswordReq struct {
	Email       string
	PhoneNumber string
	Password    string
	Otp         string
}

// ResetPassword godoc
// @Summary Reset password
// @Description Reset password
// @Tags user
// @Accept json
// @Produce json
// @Param resetPassword body ResetPasswordReq true "Reset password"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /user/resetPassword [post]
func ResetPassword(logger *slog.Logger, userSvc *user.Service,
	validator *customvalidator.CustomValidator) fiber.Handler {
	return func(c *fiber.Ctx) error {
		var req ResetPasswordReq
		if err := c.BodyParser(&req); err != nil {
			logger.Error("ResetPassword failed", "error", err)
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": "Invalid request",
			})
		}
		valErrs, ok := validator.Validate(c, req)
		if !ok {
			response.WriteJSON(c, fiber.StatusBadRequest, "Invalid request", valErrs, nil)
			return nil
		}
		user := domain.ResetPasswordReq{
			Email:       req.Email,
			PhoneNumber: req.PhoneNumber,
			Password:    req.Password,
			Otp:         req.Otp,
		}
		medium, err := getMedium(req.Email, req.PhoneNumber)
		if err != nil {
			logger.Error("ResetPassword failed", "error", err)
			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
				"error": err.Error(),
			})
		}
		user.OtpMedium = medium
		if err := userSvc.ResetPassword(c.Context(), user); err != nil {
			logger.Error("ResetPassword failed", "error", err)
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
				"error": "Internal server error",
			})
		}
		return response.WriteJSON(c, fiber.StatusOK, "Password reset successful", nil, nil)
	}
}

type UserProfileRes struct {
	ID            int64       `json:"id"`
	FirstName     string      `json:"first_name"`
	LastName      string      `json:"last_name"`
	Email         string      `json:"email"`
	PhoneNumber   string      `json:"phone_number"`
	Role          domain.Role `json:"role"`
	EmailVerified bool        `json:"email_verified"`
	PhoneVerified bool        `json:"phone_verified"`
	CreatedAt     time.Time   `json:"created_at"`
	UpdatedAt     time.Time   `json:"updated_at"`
	SuspendedAt   time.Time   `json:"suspended_at"`
	Suspended     bool        `json:"suspended"`
}

// UserProfile godoc
// @Summary Get user profile
// @Description Get user profile
// @Tags user
// @Accept json
// @Produce json
// @Success 200 {object} UserProfileRes
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security Bearer
// @Router /user/profile [get]
func UserProfile(logger *slog.Logger, userSvc *user.Service) fiber.Handler {
	return func(c *fiber.Ctx) error {
		userId := c.Locals("user_id").(int64)
		user, err := userSvc.GetUserByID(c.Context(), userId)
		if err != nil {
			logger.Error("GetUserProfile failed", "error", err)
			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
				"error": "Internal server error",
			})
		}

		res := UserProfileRes{
			ID:            user.ID,
			FirstName:     user.FirstName,
			LastName:      user.LastName,
			Email:         user.Email,
			PhoneNumber:   user.PhoneNumber,
			Role:          user.Role,
			EmailVerified: user.EmailVerified,
			PhoneVerified: user.PhoneVerified,
			CreatedAt:     user.CreatedAt,
			UpdatedAt:     user.UpdatedAt,
			SuspendedAt:   user.SuspendedAt,
			Suspended:     user.Suspended,
		}
		return response.WriteJSON(c, fiber.StatusOK, "User profile retrieved successfully", res, nil)
	}
}
func getMedium(email, phoneNumber string) (domain.OtpMedium, error) {
	if email != "" {
		return domain.OtpMediumEmail, nil
	}
	if phoneNumber != "" {
		return domain.OtpMediumSms, nil
	}
	return "", errors.New("both email and phone number are empty")
}