// Copyright 2016 Google Inc. All rights reserved.
//
// 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 android

import (
	"fmt"
	"testing"
)

var vars = map[string]string{
	"var1": "abc",
	"var2": "",
	"var3": "def",
	"💩":    "😃",
}

func expander(s string) (string, error) {
	if val, ok := vars[s]; ok {
		return val, nil
	} else {
		return "", fmt.Errorf("unknown variable %q", s)
	}
}

var expandTestCases = []struct {
	in  string
	out string
	err bool
}{
	{
		in:  "$(var1)",
		out: "abc",
	},
	{
		in:  "$( var1 )",
		out: "abc",
	},
	{
		in:  "def$(var1)",
		out: "defabc",
	},
	{
		in:  "$(var1)def",
		out: "abcdef",
	},
	{
		in:  "def$(var1)def",
		out: "defabcdef",
	},
	{
		in:  "$(var2)",
		out: "",
	},
	{
		in:  "def$(var2)",
		out: "def",
	},
	{
		in:  "$(var2)def",
		out: "def",
	},
	{
		in:  "def$(var2)def",
		out: "defdef",
	},
	{
		in:  "$(var1)$(var3)",
		out: "abcdef",
	},
	{
		in:  "$(var1)g$(var3)",
		out: "abcgdef",
	},
	{
		in:  "$$",
		out: "$$",
	},
	{
		in:  "$$(var1)",
		out: "$$(var1)",
	},
	{
		in:  "$$$(var1)",
		out: "$$abc",
	},
	{
		in:  "$(var1)$$",
		out: "abc$$",
	},
	{
		in:  "$(💩)",
		out: "😃",
	},

	// Errors
	{
		in:  "$",
		err: true,
	},
	{
		in:  "$$$",
		err: true,
	},
	{
		in:  "$(var1)$",
		err: true,
	},
	{
		in:  "$(var1)$",
		err: true,
	},
	{
		in:  "$(var4)",
		err: true,
	},
	{
		in:  "$var1",
		err: true,
	},
	{
		in:  "$(var1",
		err: true,
	},
	{
		in:  "$a💩c",
		err: true,
	},
}

func TestExpand(t *testing.T) {
	for _, test := range expandTestCases {
		got, err := Expand(test.in, expander)
		if err != nil && !test.err {
			t.Errorf("%q: unexpected error %s", test.in, err.Error())
		} else if err == nil && test.err {
			t.Errorf("%q: expected error, got %q", test.in, got)
		} else if !test.err && got != test.out {
			t.Errorf("%q: expected %q, got %q", test.in, test.out, got)
		}
	}
}