// Copyright 2021 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 config

import (
	"testing"
)

func TestExpandVars(t *testing.T) {
	testCases := []struct {
		description     string
		stringScope     exportedStringVariables
		stringListScope exportedStringListVariables
		toExpand        string
		expectedValues  []string
	}{
		{
			description:    "no expansion for non-interpolated value",
			toExpand:       "foo",
			expectedValues: []string{"foo"},
		},
		{
			description: "single level expansion for string var",
			stringScope: exportedStringVariables{
				"foo": "bar",
			},
			toExpand:       "${foo}",
			expectedValues: []string{"bar"},
		},
		{
			description: "single level expansion string list var",
			stringListScope: exportedStringListVariables{
				"foo": []string{"bar"},
			},
			toExpand:       "${foo}",
			expectedValues: []string{"bar"},
		},
		{
			description: "mixed level expansion for string list var",
			stringScope: exportedStringVariables{
				"foo": "${bar}",
				"qux": "hello",
			},
			stringListScope: exportedStringListVariables{
				"bar": []string{"baz", "${qux}"},
			},
			toExpand:       "${foo}",
			expectedValues: []string{"baz", "hello"},
		},
		{
			description: "double level expansion",
			stringListScope: exportedStringListVariables{
				"foo": []string{"${bar}"},
				"bar": []string{"baz"},
			},
			toExpand:       "${foo}",
			expectedValues: []string{"baz"},
		},
		{
			description: "double level expansion with a literal",
			stringListScope: exportedStringListVariables{
				"a": []string{"${b}", "c"},
				"b": []string{"d"},
			},
			toExpand:       "${a}",
			expectedValues: []string{"d", "c"},
		},
		{
			description: "double level expansion, with two variables in a string",
			stringListScope: exportedStringListVariables{
				"a": []string{"${b} ${c}"},
				"b": []string{"d"},
				"c": []string{"e"},
			},
			toExpand:       "${a}",
			expectedValues: []string{"d", "e"},
		},
		{
			description: "triple level expansion with two variables in a string",
			stringListScope: exportedStringListVariables{
				"a": []string{"${b} ${c}"},
				"b": []string{"${c}", "${d}"},
				"c": []string{"${d}"},
				"d": []string{"foo"},
			},
			toExpand:       "${a}",
			expectedValues: []string{"foo", "foo", "foo"},
		},
	}

	for _, testCase := range testCases {
		t.Run(testCase.description, func(t *testing.T) {
			output := expandVar(testCase.toExpand, testCase.stringScope, testCase.stringListScope)
			if len(output) != len(testCase.expectedValues) {
				t.Errorf("Expected %d values, got %d", len(testCase.expectedValues), len(output))
			}
			for i, actual := range output {
				expectedValue := testCase.expectedValues[i]
				if actual != expectedValue {
					t.Errorf("Actual value '%s' doesn't match expected value '%s'", actual, expectedValue)
				}
			}
		})
	}
}

func TestBazelToolchainVars(t *testing.T) {
	testCases := []struct {
		name        string
		vars        []bazelVarExporter
		expectedOut string
	}{
		{
			name: "exports strings",
			vars: []bazelVarExporter{
				exportedStringVariables{
					"a": "b",
					"c": "d",
				},
			},
			expectedOut: `# GENERATED FOR BAZEL FROM SOONG. DO NOT EDIT.

_a = "b"

_c = "d"

constants = struct(
    a = _a,
    c = _c,
)`,
		},
		{
			name: "exports string lists",
			vars: []bazelVarExporter{
				exportedStringListVariables{
					"a": []string{"b1", "b2"},
					"c": []string{"d1", "d2"},
				},
			},
			expectedOut: `# GENERATED FOR BAZEL FROM SOONG. DO NOT EDIT.

_a = [
    "b1",
    "b2",
]

_c = [
    "d1",
    "d2",
]

constants = struct(
    a = _a,
    c = _c,
)`,
		},
		{
			name: "exports string lists dicts",
			vars: []bazelVarExporter{
				exportedStringListDictVariables{
					"a": map[string][]string{"b1": []string{"b2"}},
					"c": map[string][]string{"d1": []string{"d2"}},
				},
			},
			expectedOut: `# GENERATED FOR BAZEL FROM SOONG. DO NOT EDIT.

_a = {
    "b1": [
        "b2",
    ],
}

_c = {
    "d1": [
        "d2",
    ],
}

constants = struct(
    a = _a,
    c = _c,
)`,
		},
		{
			name: "sorts across types",
			vars: []bazelVarExporter{
				exportedStringVariables{
					"b": "b-val",
					"d": "d-val",
				},
				exportedStringListVariables{
					"c": []string{"c-val"},
					"e": []string{"e-val"},
				},
				exportedStringListDictVariables{
					"a": map[string][]string{"a1": []string{"a2"}},
					"f": map[string][]string{"f1": []string{"f2"}},
				},
			},
			expectedOut: `# GENERATED FOR BAZEL FROM SOONG. DO NOT EDIT.

_a = {
    "a1": [
        "a2",
    ],
}

_b = "b-val"

_c = [
    "c-val",
]

_d = "d-val"

_e = [
    "e-val",
]

_f = {
    "f1": [
        "f2",
    ],
}

constants = struct(
    a = _a,
    b = _b,
    c = _c,
    d = _d,
    e = _e,
    f = _f,
)`,
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			out := bazelToolchainVars(tc.vars...)
			if out != tc.expectedOut {
				t.Errorf("Expected \n%s, got \n%s", tc.expectedOut, out)
			}
		})
	}
}