// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package llcpp

import (
	"bytes"
	"fmt"
	"strings"
	"testing"

	"fidl/compiler/backend/cpp/ir"
	"fidl/compiler/backend/typestest"
)

type example string

func (s example) header() string {
	return fmt.Sprintf("%s.llcpp.h.golden", s)
}

func (s example) source() string {
	return fmt.Sprintf("%s.llcpp.cpp.golden", s)
}

var excludedCases = map[string]bool{
	"tables.fidl.json": true,
	"xunion.fidl.json": true,
}
var cases = func() []string {
	var (
		filtered []string
		excluded = 0
	)
	for _, filename := range typestest.AllExamples() {
		if excludedCases[filename] {
			excluded++
		} else {
			filtered = append(filtered, filename)
		}
	}
	if len(excludedCases) != excluded {
		panic(fmt.Sprintf("Wrong. Nonexistent excluded case!"))
	}
	return filtered
}()


func TestCodegenHeader(t *testing.T) {
	for _, filename := range cases {
		t.Run(filename, func(t *testing.T) {
			fidl := typestest.GetExample(filename)
			tree := ir.Compile(fidl)
			tree.PrimaryHeader = strings.TrimRight(example(filename).header(), ".golden")
			header := typestest.GetGolden(example(filename).header())

			buf := new(bytes.Buffer)
			if err := NewFidlGenerator().GenerateHeader(buf, tree); err != nil {
				t.Fatalf("unexpected error while generating header: %s", err)
			}

			typestest.AssertCodegenCmp(t, header, buf.Bytes())
		})
	}
}
func TestCodegenSource(t *testing.T) {
	for _, filename := range cases {
		t.Run(filename, func(t *testing.T) {
			fidl := typestest.GetExample(filename)
			tree := ir.Compile(fidl)
			tree.PrimaryHeader = strings.TrimRight(example(filename).header(), ".golden")
			source := typestest.GetGolden(example(filename).source())

			buf := new(bytes.Buffer)
			if err := NewFidlGenerator().GenerateSource(buf, tree); err != nil {
				t.Fatalf("unexpected error while generating source: %s", err)
			}

			typestest.AssertCodegenCmp(t, source, buf.Bytes())
		})
	}
}