// Copyright 2020 CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package path

import (
	"strings"
	"testing"
)

type MatchTest struct {
	pattern, s string
	match      bool
	err        error
}

var matchTests = []MatchTest{
	{"abc", "abc", true, nil},
	{"*", "abc", true, nil},
	{"*c", "abc", true, nil},
	{"a*", "a", true, nil},
	{"a*", "abc", true, nil},
	{"a*", "ab/c", false, nil},
	{"a*/b", "abc/b", true, nil},
	{"a*/b", "a/c/b", false, nil},
	{"a*b*c*d*e*/f", "axbxcxdxe/f", true, nil},
	{"a*b*c*d*e*/f", "axbxcxdxexxx/f", true, nil},
	{"a*b*c*d*e*/f", "axbxcxdxe/xxx/f", false, nil},
	{"a*b*c*d*e*/f", "axbxcxdxexxx/fff", false, nil},
	{"a*b?c*x", "abxbbxdbxebxczzx", true, nil},
	{"a*b?c*x", "abxbbxdbxebxczzy", false, nil},
	{"ab[c]", "abc", true, nil},
	{"ab[b-d]", "abc", true, nil},
	{"ab[e-g]", "abc", false, nil},
	{"ab[^c]", "abc", false, nil},
	{"ab[^b-d]", "abc", false, nil},
	{"ab[^e-g]", "abc", true, nil},
	{"a\\*b", "a*b", true, nil},
	{"a\\*b", "ab", false, nil},
	{"a?b", "a☺b", true, nil},
	{"a[^a]b", "a☺b", true, nil},
	{"a???b", "a☺b", false, nil},
	{"a[^a][^a][^a]b", "a☺b", false, nil},
	{"[a-ζ]*", "α", true, nil},
	{"*[a-ζ]", "A", false, nil},
	{"a?b", "a/b", false, nil},
	{"a*b", "a/b", false, nil},
	{"[\\]a]", "]", true, nil},
	{"[\\-]", "-", true, nil},
	{"[x\\-]", "x", true, nil},
	{"[x\\-]", "-", true, nil},
	{"[x\\-]", "z", false, nil},
	{"[\\-x]", "x", true, nil},
	{"[\\-x]", "-", true, nil},
	{"[\\-x]", "a", false, nil},
	{"[]a]", "]", false, ErrBadPattern},
	{"[-]", "-", false, ErrBadPattern},
	{"[x-]", "x", false, ErrBadPattern},
	{"[x-]", "-", false, ErrBadPattern},
	{"[x-]", "z", false, ErrBadPattern},
	{"[-x]", "x", false, ErrBadPattern},
	{"[-x]", "-", false, ErrBadPattern},
	{"[-x]", "a", false, ErrBadPattern},
	{"\\", "a", false, ErrBadPattern},
	{"[a-b-c]", "a", false, ErrBadPattern},
	{"[", "a", false, ErrBadPattern},
	{"[^", "a", false, ErrBadPattern},
	{"[^bc", "a", false, ErrBadPattern},
	{"a[", "a", false, ErrBadPattern},
	{"a[", "ab", false, ErrBadPattern},
	{"a[", "x", false, ErrBadPattern},
	{"a/b[", "x", false, ErrBadPattern},
	{"*x", "xxx", true, nil},
}

func errp(e error) string {
	if e == nil {
		return "<nil>"
	}
	return e.Error()
}

func TestMatch(t *testing.T) {
	for _, os := range []OS{Unix, Windows, Plan9} {
		for _, tt := range matchTests {
			pattern := tt.pattern
			s := tt.s
			if os == Windows {
				if strings.Contains(pattern, "\\") {
					// no escape allowed on windows.
					continue
				}
				pattern = Clean(pattern, os)
				s = Clean(s, os)
			}
			ok, err := Match(pattern, s, os)
			if ok != tt.match || err != tt.err {
				t.Errorf("Match(%#q, %#q, %q) = %v, %q want %v, %q",
					pattern, s, os, ok, errp(err), tt.match, errp(tt.err))
			}
		}
	}
}
