package repository

import (
	"context"
	"errors"
	"fmt"
	"mime/multipart"
	"strings"
	"time"

	"github.com/minio/minio-go/v7"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"go.uber.org/zap"
	"penahub.gitlab.yandexcloud.net/backend/verification/internal/models"
)

type VerificationRepository struct {
	logger *zap.Logger
	mongo  *mongo.Collection
	s3     *minio.Client
	folder, url string
}

const (
	VerificationEndpointURL = "https://hub.pena.digital"
	VerificationBucket      = "3c580be9-cf31f296-d055-49cf-b39e-30c7959dc17b"
	VerificationCollection  = "verification"
)

func NewVerificationRepository(logger *zap.Logger, mongoDb *mongo.Database, s3 *minio.Client, folder, url string) *VerificationRepository {
	return &VerificationRepository{
		logger: logger,
		mongo:  mongoDb.Collection(VerificationCollection),
		s3:     s3,
		folder: folder,
		url: url,
	}
}
func (r *VerificationRepository) Insert(
	ctx context.Context,
	userID string,
	record *models.Verification,
	innFH, ruleFH, egruleFH, certFH *multipart.FileHeader) (*models.Verification, error) {
	now := time.Now()
	record.ID = primitive.NewObjectIDFromTimestamp(now).Hex()
	record.UpdatedAt = now

	// Put inn file
	inn, err := innFH.Open()
	if r.err(err) {
		return nil, err
	}

	_, err = r.s3.PutObject(ctx, VerificationBucket, fmt.Sprintf("%s/%s/%s", r.folder, userID, innFH.Filename), inn, innFH.Size, minio.PutObjectOptions{})
	if r.err(err) {
		return nil, err
	}

	rule, err := ruleFH.Open()
	if r.err(err) {
		return nil, err
	}

	// Put rule file
	_, err = r.s3.PutObject(ctx, VerificationBucket, fmt.Sprintf("%s/%s/%s", r.folder, userID, ruleFH.Filename), rule, ruleFH.Size, minio.PutObjectOptions{})
	if r.err(err) {
		return nil, err
	}

	// Put egrule file
	egrule, err := egruleFH.Open()
	if r.err(err) {
		return nil, err
	}

	_, err = r.s3.PutObject(ctx, VerificationBucket, fmt.Sprintf("%s/%s/%s", r.folder, userID, egruleFH.Filename), egrule, egruleFH.Size, minio.PutObjectOptions{})
	if r.err(err) {
		return nil, err
	}

	// Put certificate file
	if certFH != nil {
		cert, err := certFH.Open()
		if r.err(err) {
			return nil, err
		}

		_, err = r.s3.PutObject(ctx, VerificationBucket, fmt.Sprintf("%s/%s/%s", r.folder, userID, certFH.Filename), cert, certFH.Size, minio.PutObjectOptions{})
		if r.err(err) {
			return nil, err
		}

		record.Files = []models.VerificationFile{
			{
				Name: "certificate",
				Url:  fmt.Sprintf("%s/%s/%s/%s", VerificationEndpointURL, VerificationBucket, userID, certFH.Filename),
			},
		}
	}

	// Insert to MongoDB
	record.Files = append(record.Files, []models.VerificationFile{
		{
			Name: "inn",
			Url:  fmt.Sprintf("%s/%s/%s/%s", r.url,r.folder, userID, innFH.Filename),
		},
		{
			Name: "rule",
			Url:  fmt.Sprintf("%s/%s/%s/%s", r.url,r.folder, userID, ruleFH.Filename),
		},
		{
			Name: "egrule",
			Url:  fmt.Sprintf("%s/%s/%s/%s", r.url,r.folder, userID, egruleFH.Filename),
		},
	}...)

	result, err := r.mongo.InsertOne(ctx, record)
	if r.err(err) {
		return nil, err
	}

	record.ID = result.InsertedID.(string)
	return record, nil
}

func (r *VerificationRepository) GetByUserID(ctx context.Context, userID string) (*models.Verification, error) {
	if userID == "" {
		err := errors.New("userID cannot be empty")
		r.logger.Error("VerificationRepositoryError", zap.Error(err))
		return nil, err
	}

	filter := bson.M{
		"user_id": userID,
	}

	opts := options.FindOne().SetSort(bson.D{{Key: "updated_at", Value: -1}})

	var result models.Verification
	err := r.mongo.FindOne(ctx, filter, opts).Decode(&result)
	if err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, nil
		}
		r.logger.Error("VerificationRepositoryError", zap.Error(err))
		return nil, err
	}

	return &result, nil
}

func (r *VerificationRepository) Get(ctx context.Context, id string) (*models.Verification, error) {
	if id == "" {
		err := errors.New("_id cannot be empty")
		r.logger.Error("VerificationRepositoryError", zap.Error(err))
		return nil, err
	}

	filter := bson.M{
		"_id": id,
	}

	var result models.Verification
	err := r.mongo.FindOne(ctx, filter).Decode(&result)
	if err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, nil
		}
		r.logger.Error("VerificationRepositoryError", zap.Error(err))
		return nil, err
	}

	return &result, nil
}

func (r *VerificationRepository) Update(ctx context.Context, record *models.Verification) (*models.Verification, error) {
	record.UpdatedAt = time.Now()

	test := models.VerificationUpdate{
		Accepted:  record.Accepted,
		Status:    record.Status,
		UpdatedAt: time.Now(),
		Comment:   record.Comment,
		Files:     record.Files,
		TaxNumber: record.TaxNumber,
	}

	var result models.Verification
	err := r.mongo.FindOneAndUpdate(ctx, bson.M{"_id": record.ID}, bson.M{"$set": test}, options.FindOneAndUpdate().SetReturnDocument(options.After)).Decode(&result)
	if r.err(err) {
		return nil, err
	}
	return &result, nil
}

func (r *VerificationRepository) UpdateFile(ctx context.Context, userID, fileName string, fileHeader *multipart.FileHeader) (*models.Verification, error) {
	var err error

	// put file
	fileReader, err := fileHeader.Open()
	if r.err(err) {
		return nil, err
	}

	_, err = r.s3.PutObject(ctx, VerificationBucket, fmt.Sprintf("%s/%s/%s", r.folder, userID, fileHeader.Filename), fileReader, fileHeader.Size, minio.PutObjectOptions{})
	if r.err(err) {
		return nil, err
	}

	fileURL := fmt.Sprintf("%s/%s/%s/%s", VerificationEndpointURL,r.folder, userID, fileHeader.Filename)

	// remove old file
	verification, err := r.GetByUserID(ctx, userID)
	if r.err(err) {
		return nil, err
	}
  
  if verification == nil {
    return nil, fmt.Errorf("no verification found")
  }

	found := false
	for iterator, file := range verification.Files {
		if file.Name != fileName {
			continue
		}

		objectName := strings.ReplaceAll(file.Url, fmt.Sprintf("%v/%v/", VerificationEndpointURL, VerificationBucket), "")
		if err = r.s3.RemoveObject(ctx, VerificationBucket, objectName, minio.RemoveObjectOptions{}); r.err(err) {
			return nil, err
		}

		verification.Files[iterator] = models.VerificationFile{Name: file.Name, Url: fileURL}
		found = true
	}

	if !found {
		verification.Files = append(verification.Files, models.VerificationFile{Name: fileName, Url: fileURL})
	}

	// update in mongodb
	result, err := r.Update(ctx, &models.Verification{ID: verification.ID, Files: verification.Files})
	if r.err(err) {
		return nil, err
	}

	return result, nil
}

func (r *VerificationRepository) err(err error) bool {
	if err != nil {
		r.logger.Error("VerificationRepositoryError", zap.Error(err))
		return true
	}
	return false
}