package storage

import (
	"context"
	"fmt"
	"io"
	"os"
	"strings"
	"testing"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/feature/s3/manager"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	"github.com/stretchr/testify/assert"
)

func TestNew(t *testing.T) {
	type args struct {
		bucket string
	}
	tests := []struct {
		name    string
		args    args
		setup   func() func()
		wantErr bool
	}{
		{
			name: "invalid AWS config",
			args: args{},
			setup: func() func() {
				_ = os.Setenv("AWS_MAX_ATTEMPTS", "invalid")
				return func() {
					_ = os.Unsetenv("AWS_MAX_ATTEMPTS")
				}
			},
			wantErr: true,
		},
		{
			name: "success",
			args: args{},
			setup: func() func() {
				return func() {
				}
			},
			wantErr: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer tt.setup()()
			_, err := New(tt.args.bucket)
			if (err != nil) != tt.wantErr {
				t.Errorf("New() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
		})
	}
}

func TestS3_Store(t *testing.T) {
	type fields struct {
		bucket string
		svc    func(t *testing.T) Uploader
	}
	type args struct {
		path    string
		content io.Reader
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		wantErr bool
	}{
		{
			name: "upload error",
			fields: fields{
				bucket: "some-bucket",
				svc: func(t *testing.T) Uploader {
					return &mock{
						upload: func(ctx context.Context, input *s3.PutObjectInput, f ...func(*manager.Uploader)) (*manager.UploadOutput, error) {
							assert.Equal(t, aws.String("some-bucket"), input.Bucket)
							assert.Equal(t, aws.String("/some/path"), input.Key)
							buff, err := io.ReadAll(input.Body)
							assert.NoError(t, err)
							assert.Equal(t, "some content", string(buff))
							return nil, fmt.Errorf("error")
						},
					}
				},
			},
			args: args{
				path:    "/some/path",
				content: strings.NewReader("some content"),
			},
			wantErr: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var svc Uploader
			if tt.fields.svc != nil {
				svc = tt.fields.svc(t)
			}
			s := &S3{
				bucket: tt.fields.bucket,
				svc:    svc,
			}
			if err := s.Store(tt.args.path, tt.args.content); (err != nil) != tt.wantErr {
				t.Errorf("Store() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}

type mock struct {
	upload func(ctx context.Context, input *s3.PutObjectInput, f ...func(*manager.Uploader)) (*manager.UploadOutput, error)
}

func (m *mock) Upload(ctx context.Context, input *s3.PutObjectInput, f ...func(*manager.Uploader)) (*manager.UploadOutput, error) {
	if m.upload != nil {
		return m.upload(ctx, input, f...)
	}
	return nil, nil
}

var _ Uploader = &mock{}