// Copyright (C) 2016 The Android Open Source Project
//
// 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 fsm_test

import (
	"fmt"
	"testing"

	"android.googlesource.com/platform/tools/gpu/framework/assert"
	"android.googlesource.com/platform/tools/gpu/framework/fsm"
)

func TestStructure(t *testing.T) {
	const expect = `
FSM ==> A
    A => B
        exit -> D
    B
        doa -> A (1 hook)
        doc -> C
        exit -> D
    C
        doa -> A (2 hooks)
        exit -> D (1 hook)
    D
        exit -> D
`
	ctx := assert.Context(t)
	compiled, err := fsm.Compile(fsm.FSM{
		States: []fsm.State{
			{Name: "A"},
			{Name: "B"},
			{Name: "C"},
			{Name: "D"},
		},
		Transitions: []fsm.Transition{
			{From: "A", To: "B"},
			{From: fsm.NoneOf("A", "D"), Event: "doa", To: "A"},
			{From: "B", Event: "doc", To: "C"},
			{Event: "exit", To: "D"},
		},
		Hooks: []fsm.Hook{
			{Event: "doa"},
			{From: "C"},
		},
	})
	assert.With(ctx).ThatError(err).Succeeded()
	assert.With(ctx).That(fmt.Sprintf("\n%v", compiled)).Equals(expect)
}

func TestMustCompileFailure(t *testing.T) {
	ctx := assert.Context(t)
	defer func() {
		assert.With(ctx).ThatString(recover()).Equals("No states specified")
	}()
	fsm.MustCompile(fsm.FSM{})
	ctx.Error().Log("MustCompile failed to panic")
}