// Copyright 2020 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 main

import (
	"strings"
	"testing"

	"github.com/google/blueprint/parser"
	"github.com/google/blueprint/proptools"
)

var testCases = []struct {
	name      string
	input     string
	output    string
	property  string
	addSet    string
	removeSet string
	setString *string
}{
	{
		name: "add",
		input: `
			cc_foo {
				name: "foo",
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				deps: ["bar"],
			}
		`,
		property: "deps",
		addSet:   "bar",
	},
	{
		name: "remove",
		input: `
			cc_foo {
				name: "foo",
				deps: ["bar"],
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				deps: [],
			}
		`,
		property:  "deps",
		removeSet: "bar",
	},
	{
		name: "nested add",
		input: `
			cc_foo {
				name: "foo",
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
							"dep2",
							"nested_dep",],
					},
				},
			}
		`,
		property: "arch.arm.deps",
		addSet:   "nested_dep,dep2",
	},
	{
		name: "nested remove",
		input: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
							"dep2",
							"nested_dep",
						],
					},
				},
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
						],
					},
				},
			}
		`,
		property:  "arch.arm.deps",
		removeSet: "nested_dep,dep2",
	},
	{
		name: "add existing",
		input: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
							"nested_dep",
							"dep2",
						],
					},
				},
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
							"nested_dep",
							"dep2",
						],
					},
				},
			}
		`,
		property: "arch.arm.deps",
		addSet:   "dep2,dep2",
	},
	{
		name: "remove missing",
		input: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
							"nested_dep",
							"dep2",
						],
					},
				},
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				arch: {
					arm: {
						deps: [
							"nested_dep",
							"dep2",
						],
					},
				},
			}
		`,
		property:  "arch.arm.deps",
		removeSet: "dep3,dep4",
	},
	{
		name: "remove non existent",
		input: `
			cc_foo {
				name: "foo",
			}
		`,
		output: `
			cc_foo {
				name: "foo",
			}
		`,
		property:  "deps",
		removeSet: "bar",
	},
	{
		name: "remove non existent nested",
		input: `
			cc_foo {
				name: "foo",
				arch: {},
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				arch: {},
			}
		`,
		property:  "arch.arm.deps",
		removeSet: "dep3,dep4",
	},
	{
		name: "add numeric sorted",
		input: `
			cc_foo {
				name: "foo",
				versions: ["1", "2"],
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				versions: [
					"1",
					"2",
					"10",
				],
			}
		`,
		property: "versions",
		addSet:   "10",
	},
	{
		name: "add mixed sorted",
		input: `
			cc_foo {
				name: "foo",
				deps: ["bar-v1-bar", "bar-v2-bar"],
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				deps: [
					"bar-v1-bar",
					"bar-v2-bar",
					"bar-v10-bar",
				],
			}
		`,
		property: "deps",
		addSet:   "bar-v10-bar",
	},
	{
		name: "set string",
		input: `
			cc_foo {
				name: "foo",
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				foo: "bar",
			}
		`,
		property:  "foo",
		setString: proptools.StringPtr("bar"),
	},
	{
		name: "set existing string",
		input: `
			cc_foo {
				name: "foo",
				foo: "baz",
			}
		`,
		output: `
			cc_foo {
				name: "foo",
				foo: "bar",
			}
		`,
		property:  "foo",
		setString: proptools.StringPtr("bar"),
	},
}

func simplifyModuleDefinition(def string) string {
	var result string
	for _, line := range strings.Split(def, "\n") {
		result += strings.TrimSpace(line)
	}
	return result
}

func TestProcessModule(t *testing.T) {
	for i, testCase := range testCases {
		t.Run(testCase.name, func(t *testing.T) {
			targetedProperty.Set(testCase.property)
			addIdents.Set(testCase.addSet)
			removeIdents.Set(testCase.removeSet)
			setString = testCase.setString

			inAst, errs := parser.ParseAndEval("", strings.NewReader(testCase.input), parser.NewScope(nil))
			if len(errs) > 0 {
				for _, err := range errs {
					t.Errorf("  %s", err)
				}
				t.Errorf("failed to parse:")
				t.Errorf("%+v", testCase)
				t.FailNow()
			}

			if inModule, ok := inAst.Defs[0].(*parser.Module); !ok {
				t.Fatalf("  input must only contain a single module definition: %s", testCase.input)
			} else {
				_, errs := processModule(inModule, "", inAst)
				if len(errs) > 0 {
					t.Errorf("test case %d:", i)
					for _, err := range errs {
						t.Errorf("  %s", err)
					}
				}
				inModuleText, _ := parser.Print(inAst)
				inModuleString := string(inModuleText)
				if simplifyModuleDefinition(inModuleString) != simplifyModuleDefinition(testCase.output) {
					t.Errorf("test case %d:", i)
					t.Errorf("expected module definition:")
					t.Errorf("  %s", testCase.output)
					t.Errorf("actual module definition:")
					t.Errorf("  %s", inModuleString)
				}
			}
		})
	}

}