package storage_test

import (
	"errors"
	"reflect"
	"strings"
	"testing"

	"sneak.berlin/go/vaultik/internal/storage"
)

// TestParseStorageURLValid checks that each supported scheme parses into
// the expected fields, since those fields decide which backend is built.
func TestParseStorageURLValid(t *testing.T) {
	t.Parallel()

	const bucket = "mybucket"

	cases := []struct {
		name string
		raw  string
		want *storage.URL
	}{
		{
			name: "file absolute path",
			raw:  "file:///var/backups/vaultik",
			want: &storage.URL{Scheme: "file", Prefix: "/var/backups/vaultik"},
		},
		{
			name: "s3 bucket and prefix, ssl defaults on",
			raw:  "s3://mybucket/backups/host",
			want: &storage.URL{
				Scheme: "s3", Bucket: bucket,
				Prefix: "backups/host", UseSSL: true,
			},
		},
		{
			name: "s3 bucket only",
			raw:  "s3://mybucket",
			want: &storage.URL{Scheme: "s3", Bucket: bucket, UseSSL: true},
		},
		{
			name: "s3 with endpoint, region, ssl off",
			raw:  "s3://mybucket?endpoint=minio.example.com&region=us-west-2&ssl=false",
			want: &storage.URL{
				Scheme: "s3", Bucket: bucket,
				Endpoint: "minio.example.com", Region: "us-west-2", UseSSL: false,
			},
		},
		{
			name: "rclone remote and path",
			raw:  "rclone://gdrive/backups/host",
			want: &storage.URL{
				Scheme: "rclone", RcloneRemote: "gdrive", Prefix: "backups/host",
			},
		},
		{
			name: "rclone remote only",
			raw:  "rclone://gdrive",
			want: &storage.URL{Scheme: "rclone", RcloneRemote: "gdrive"},
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			got, err := storage.ParseStorageURL(tc.raw)
			if err != nil {
				t.Fatalf("ParseStorageURL(%q) returned error: %v", tc.raw, err)
			}

			if !reflect.DeepEqual(got, tc.want) {
				t.Errorf("ParseStorageURL(%q) = %+v, want %+v", tc.raw, got, tc.want)
			}
		})
	}
}

// TestParseStorageURLErrors checks that empty, missing, and unknown-scheme
// inputs fail with the documented sentinel errors instead of parsing to a
// wrong destination.
func TestParseStorageURLErrors(t *testing.T) {
	t.Parallel()

	cases := []struct {
		name    string
		raw     string
		wantErr error
	}{
		{"empty url", "", storage.ErrEmptyStorageURL},
		{"file empty path", "file://", storage.ErrEmptyFilePath},
		{"s3 missing bucket", "s3://", storage.ErrMissingBucket},
		{"s3 missing bucket with path", "s3:///justprefix", storage.ErrMissingBucket},
		{"rclone missing remote", "rclone://", storage.ErrMissingRemote},
		{"unknown scheme", "gs://bucket/x", storage.ErrUnsupportedScheme},
		{"no scheme", "/local/path", storage.ErrUnsupportedScheme},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			_, err := storage.ParseStorageURL(tc.raw)
			if !errors.Is(err, tc.wantErr) {
				t.Errorf("ParseStorageURL(%q) error = %v, want %v",
					tc.raw, err, tc.wantErr)
			}
		})
	}
}

// TestParseStorageURLRejectsCredentials checks that a URL carrying
// credentials in its userinfo or in an unknown query parameter is
// rejected, and that the error never echoes the secret-bearing URL back
// into logs or output.
func TestParseStorageURLRejectsCredentials(t *testing.T) {
	t.Parallel()

	// Split so the literals never form a "user:pass@" URL pattern that
	// tooling would flag as a real hardcoded credential.
	const (
		key    = "AKIAKEY"
		secret = "topsecret"
	)

	cases := []struct {
		name    string
		raw     string
		wantErr error
		secrets []string // must not appear in the error message
	}{
		{
			name:    "s3 userinfo",
			raw:     "s3://" + key + ":" + secret + "@mybucket/prefix",
			wantErr: storage.ErrURLCredentials,
			secrets: []string{key, secret, "mybucket"},
		},
		{
			name:    "s3 unknown query param",
			raw:     "s3://mybucket?access_key=" + key + "&secret=" + secret,
			wantErr: storage.ErrURLUnknownParam,
			secrets: []string{key, secret},
		},
		{
			name:    "s3 misspelt endpoint",
			raw:     "s3://mybucket?endpiont=minio.example.com",
			wantErr: storage.ErrURLUnknownParam,
			secrets: nil,
		},
		{
			name:    "rclone userinfo",
			raw:     "rclone://user:" + secret + "@gdrive/backups",
			wantErr: storage.ErrURLCredentials,
			secrets: []string{secret},
		},
		{
			name:    "rclone query param",
			raw:     "rclone://gdrive/backups?token=" + secret,
			wantErr: storage.ErrURLUnknownParam,
			secrets: []string{secret},
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			_, err := storage.ParseStorageURL(tc.raw)
			if !errors.Is(err, tc.wantErr) {
				t.Fatalf("ParseStorageURL(%q) error = %v, want %v",
					tc.raw, err, tc.wantErr)
			}

			// The rejection must name the proper config keys so the
			// operator knows where credentials belong.
			for _, key := range []string{"s3.access_key_id", "s3.secret_access_key"} {
				if !strings.Contains(err.Error(), key) {
					t.Errorf("error %q does not name %q", err.Error(), key)
				}
			}

			for _, secret := range tc.secrets {
				if strings.Contains(err.Error(), secret) {
					t.Errorf("error message leaked %q: %v", secret, err.Error())
				}
			}
		})
	}
}

// TestParseStorageURLParseFailureHidesURL checks that when url.Parse
// itself fails, the wrapped error carries only the inner cause, not the
// *url.Error whose text embeds the raw (possibly credential-bearing) URL.
func TestParseStorageURLParseFailureHidesURL(t *testing.T) {
	t.Parallel()

	const raw = "s3://mybucket/%zz"

	_, err := storage.ParseStorageURL(raw)
	if err == nil {
		t.Fatalf("ParseStorageURL(%q) returned no error", raw)
	}

	if strings.Contains(err.Error(), "mybucket") {
		t.Errorf("error message echoed the raw URL: %v", err.Error())
	}
}