package storage

import (
	"bytes"
	"context"
	"fmt"
	"time"

	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"

	"github.com/rjNemo/rentease/internal/config"
	"github.com/rjNemo/rentease/internal/service/booking"
)

type MinioInvoiceStorage struct {
	bucket string
	client *minio.Client
}

func NewMinioInvoiceStorage(cfg *config.Config) (*MinioInvoiceStorage, error) {
	if cfg.MinIOEndpoint == "" && cfg.MinIOAccessKey == "" && cfg.MinIOSecretKey == "" && cfg.MinIOBucket == "" {
		return nil, nil
	}

	switch {
	case cfg.MinIOEndpoint == "":
		return nil, fmt.Errorf("minio endpoint is required")
	case cfg.MinIOAccessKey == "":
		return nil, fmt.Errorf("minio access key is required")
	case cfg.MinIOSecretKey == "":
		return nil, fmt.Errorf("minio secret key is required")
	case cfg.MinIOBucket == "":
		return nil, fmt.Errorf("minio bucket is required")
	}

	client, err := minio.New(cfg.MinIOEndpoint, &minio.Options{
		Creds:  credentials.NewStaticV4(cfg.MinIOAccessKey, cfg.MinIOSecretKey, ""),
		Secure: cfg.MinIOUseSSL,
	})
	if err != nil {
		return nil, fmt.Errorf("create minio client: %w", err)
	}

	return &MinioInvoiceStorage{
		bucket: cfg.MinIOBucket,
		client: client,
	}, nil
}

func (s *MinioInvoiceStorage) StoreInvoice(
	ctx context.Context,
	objectKey string,
	file booking.GeneratedFile,
	shareURLTTL time.Duration,
) (*booking.StoredInvoiceFile, error) {
	if err := s.ensureBucket(ctx); err != nil {
		return nil, err
	}

	_, err := s.client.PutObject(
		ctx,
		s.bucket,
		objectKey,
		bytes.NewReader(file.Data),
		int64(len(file.Data)),
		minio.PutObjectOptions{
			ContentType: file.ContentType,
		},
	)
	if err != nil {
		return nil, fmt.Errorf("upload object %q: %w", objectKey, err)
	}

	shareURL, err := s.client.PresignedGetObject(ctx, s.bucket, objectKey, shareURLTTL, nil)
	if err != nil {
		return nil, fmt.Errorf("presign object %q: %w", objectKey, err)
	}

	return &booking.StoredInvoiceFile{
		ObjectKey:         objectKey,
		ShareURL:          shareURL.String(),
		ShareURLExpiresAt: time.Now().UTC().Add(shareURLTTL),
	}, nil
}

func (s *MinioInvoiceStorage) ensureBucket(ctx context.Context) error {
	exists, err := s.client.BucketExists(ctx, s.bucket)
	if err != nil {
		return fmt.Errorf("check bucket %q: %w", s.bucket, err)
	}
	if exists {
		return nil
	}

	if err := s.client.MakeBucket(ctx, s.bucket, minio.MakeBucketOptions{}); err != nil {
		return fmt.Errorf("create bucket %q: %w", s.bucket, err)
	}

	return nil
}