/*
Copyright 2013 The Camlistore 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.
*/

package strutil

import (
	"reflect"
	"strings"
	"testing"
)

func TestAppendSplitN(t *testing.T) {
	var got []string
	tests := []struct {
		s, sep string
		n      int
	}{
		{"foo", "|", 1},
		{"foo", "|", -1},
		{"foo|bar", "|", 1},
		{"foo|bar", "|", -1},
		{"foo|bar|", "|", 2},
		{"foo|bar|", "|", -1},
		{"foo|bar|baz", "|", 1},
		{"foo|bar|baz", "|", 2},
		{"foo|bar|baz", "|", 3},
		{"foo|bar|baz", "|", -1},
	}
	for _, tt := range tests {
		want := strings.SplitN(tt.s, tt.sep, tt.n)
		got = AppendSplitN(got[:0], tt.s, tt.sep, tt.n)
		if !reflect.DeepEqual(want, got) {
			t.Errorf("AppendSplitN(%q, %q, %d) = %q; want %q",
				tt.s, tt.sep, tt.n, got, want)
		}
	}
}

func TestStringFromBytes(t *testing.T) {
	for _, s := range []string{"foo", "permanode", "file", "zzzz"} {
		got := StringFromBytes([]byte(s))
		if got != s {
			t.Errorf("StringFromBytes(%q) didn't round-trip; got %q instead", s, got)
		}
	}
}

func TestHasPrefixFold(t *testing.T) {
	tests := []struct {
		s, prefix string
		result    bool
	}{
		{"camli", "CAML", true},
		{"CAMLI", "caml", true},
		{"cam", "Cam", true},
		{"camli", "car", false},
		{"caml", "camli", false},
	}
	for _, tt := range tests {
		r := HasPrefixFold(tt.s, tt.prefix)
		if r != tt.result {
			t.Errorf("HasPrefixFold(%q, %q) returned %v", tt.s, tt.prefix, r)
		}
	}
}

func TestHasSuffixFold(t *testing.T) {
	tests := []struct {
		s, suffix string
		result    bool
	}{
		{"camli", "AMLI", true},
		{"CAMLI", "amli", true},
		{"mli", "MLI", true},
		{"camli", "ali", false},
		{"amli", "camli", false},
	}
	for _, tt := range tests {
		r := HasSuffixFold(tt.s, tt.suffix)
		if r != tt.result {
			t.Errorf("HasSuffixFold(%q, %q) returned %v", tt.s, tt.suffix, r)
		}
	}
}

func TestContainsFold(t *testing.T) {
	// TODO: more tests, more languages.
	// The k,K,Kelvin (for now failing) example once TODO in HasPrefixFold is fixed.
	tests := []struct {
		s, substr string
		result    bool
	}{
		{"camli", "CAML", true},
		{"CAMLI", "caml", true},
		{"cam", "Cam", true},
		{"мир", "ми", true},
		{"МИP", "ми", true},
		{"КАМЛИЙСТОР", "камлийс", true},
		{"КаМлИйСтОр", "КаМлИйС", true},
		{"camli", "car", false},
		{"caml", "camli", false},

		{"camli", "AMLI", true},
		{"CAMLI", "amli", true},
		{"mli", "MLI", true},
		{"мир", "ир", true},
		{"МИP", "ми", true},
		{"КАМЛИЙСТОР", "лийстор", true},
		{"КаМлИйСтОр", "лИйСтОр", true},
		{"мир", "р", true},
		{"camli", "ali", false},
		{"amli", "camli", false},

		{"МИP", "и", true},
		{"мир", "и", true},
		{"КАМЛИЙСТОР", "лийс", true},
		{"КаМлИйСтОр", "лИйС", true},
	}
	for _, tt := range tests {
		r := ContainsFold(tt.s, tt.substr)
		if r != tt.result {
			t.Errorf("ContainsFold(%q, %q) returned %v", tt.s, tt.substr, r)
		}
	}
}