package recovery

import (
	"codeword/internal/models"
	"codeword/internal/repository"
	"codeword/internal/services"
	"encoding/base64"
	"errors"
	"fmt"
	"github.com/gofiber/fiber/v2"
	"go.uber.org/zap"
	"time"
)

type RecoveryController struct {
	logger     *zap.Logger
	service    *services.RecoveryService
	defaultURL string
}

func NewRecoveryController(logger *zap.Logger, service *services.RecoveryService, defaultRedirectionURL string) *RecoveryController {
	return &RecoveryController{
		logger:     logger,
		service:    service,
		defaultURL: defaultRedirectionURL,
	}
}

func (r *RecoveryController) HandlePingDB(c *fiber.Ctx) error {
	startTime := time.Now()
	if err := r.service.Ping(c.Context()); err != nil {
		r.logger.Error("Failed to ping the database", zap.Error(err))
		return c.Status(fiber.StatusServiceUnavailable).SendString("DB ping failed")
	}
	duration := time.Since(startTime)

	durationMillis := duration.Milliseconds()
	responseMessage := fmt.Sprintf("DB ping success - Time taken: %d ms", durationMillis)

	return c.Status(fiber.StatusOK).SendString(responseMessage)
}

func (r *RecoveryController) HandleRecoveryRequest(c *fiber.Ctx) error {
	var req models.RecoveryRequest
	if err := c.BodyParser(&req); err != nil {
		r.logger.Error("Failed to parse recovery request", zap.Error(err))
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Bad Request"})
	}

	referralURL := c.Get("Referrer")

	if req.RedirectionURL == "" && referralURL != "" {
		req.RedirectionURL = referralURL
	} else if req.RedirectionURL == "" {
		req.RedirectionURL = r.defaultURL
	}

	user, err := r.service.FindUserByEmail(c.Context(), req.Email)
	if err != nil || user == nil {
		r.logger.Error("Failed to find user by email", zap.Error(err))
		return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "User not found"})
	}

	key, err := r.service.GenerateKey()
	if err != nil {
		r.logger.Error("Failed to generate key", zap.Error(err))
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	signUrl := req.RedirectionURL + base64.URLEncoding.EncodeToString(key)
	sign := base64.URLEncoding.EncodeToString(key)

	id, err := r.service.StoreRecoveryRecord(c.Context(), models.StoreRecDeps{UserID: user.ID.Hex(), Email: user.Email, Key: sign, Url: signUrl})
	if err != nil {
		r.logger.Error("Failed to store recovery record", zap.Error(err))
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	signWithID := sign + id // подпись с id записи

	err = r.service.RecoveryEmailTask(c.Context(), models.RecEmailDeps{UserID: user.ID.Hex(), Email: req.Email, SignWithID: signWithID, ID: id})
	if err != nil {
		r.logger.Error("Failed to send recovery email", zap.Error(err))

		if errors.Is(err, repository.ErrAlreadyReported) {
			return c.Status(fiber.StatusAlreadyReported).JSON(fiber.Map{"error": "already reported"})
		}

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

	return c.Status(fiber.StatusOK).JSON(fiber.Map{"message": "Recovery email sent successfully"})

}

func (r *RecoveryController) HandleRecoveryLink(c *fiber.Ctx) error {
	sign := c.Params("sign")

	record, err := r.service.GetRecoveryRecord(c.Context(), sign)
	if err != nil {
		r.logger.Error("Failed to get recovery record", zap.Error(err))
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

	if time.Since(record.CreatedAt) > 15*time.Minute {
		r.logger.Error("Recovery link expired", zap.String("signature", sign))
		return c.Status(fiber.StatusNotAcceptable).JSON(fiber.Map{"error": "Recovery link expired"})
	}

	tokens, err := r.service.ExchangeForTokens(record.UserID, record.Sign)
	if err != nil {
		r.logger.Error("Failed to exchange recovery link for tokens", zap.Error(err))
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "Internal Server Error"})
	}

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