package fleprocess

/*
Copyright © 2020 Jean-Marc Meessen, ON4KJM <on4kjm@gmail.com>

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.
*/

import (
	"errors"
	"os"
	"testing"
)

const testDir string = "test_dir"
const testFile string = "test.adi"

func setupTestCase(t *testing.T) func(t *testing.T) {
	t.Log("setup test case")
	//create test directory
	if os.Mkdir(testDir, os.FileMode(0522)) != nil {
		t.Error("Unexpected error creating testDir")
	}
	//create test file
	f, _ := os.OpenFile(testFile, os.O_WRONLY|os.O_CREATE, 0666)
	defer f.Close()

	return func(t *testing.T) {
		t.Log("teardown test case")
		//delete test directory
		os.Remove(testDir)
		//delete test file
		os.Remove(testFile)
	}
}

func Test_buildOutputFilename(t *testing.T) {
	type args struct {
		output    string
		input     string
		overwrite bool
		extension string
	}
	tests := []struct {
		name               string
		args               args
		wantOutputFilename string
		wantError          error
	}{
		{
			"input file not provided",
			args{input: "", output: "xxx", overwrite: false, extension: ".adi"},
			"", errors.New("unexpected error: no input file provided"),
		},
		{
			"Output file does not exist",
			args{input: "a file", output: "output.adi", overwrite: false, extension: ".adi"},
			"output.adi", nil,
		},
		{
			"Output name is a directory",
			args{input: "a file", output: testDir, overwrite: false, extension: ".adi"},
			"", errors.New("error: specified output exists and is a directory"),
		},
		{
			"Output exist but no overwrite",
			args{input: "a file", output: testFile, overwrite: false, extension: ".adi"},
			"", errors.New("file already exists. Use --overwrite flag if necessary"),
		},
		{
			"Output exist but user wants to overwrite",
			args{input: "a file", output: testFile, overwrite: true, extension: ".adi"},
			"test.adi", nil,
		},
		{
			"no output, input provided with extension",
			args{input: "/test/data/file.txt", output: "", overwrite: false, extension: ".adi"},
			"/test/data/file.adi", nil,
		},
		{
			"no output, input provided without extension",
			args{input: "/test/data/file", output: "", overwrite: false, extension: ".adi"},
			"/test/data/file.adi", nil,
		},
		{
			"no output, input provided, ending with a point",
			args{input: "/test/data/file.", output: "", overwrite: false, extension: ".adi"},
			"/test/data/file.adi", nil,
		},
	}

	teardownTestCase := setupTestCase(t)
	defer teardownTestCase(t)

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotOutputFilename, gotErr := buildOutputFilename(tt.args.output, tt.args.input, tt.args.overwrite, tt.args.extension)

			if gotOutputFilename != tt.wantOutputFilename {
				t.Errorf("buildOutputFilename() gotOutputFilename = %v, want %v", gotOutputFilename, tt.wantOutputFilename)
			}

			//test the error message, if any
			if gotErr != nil && tt.wantError != nil {
				if gotErr.Error() != tt.wantError.Error() {
					t.Errorf("buildOutputFilename() error = %v, want %v", gotErr, tt.wantError)
				}
			} else {
				if !(gotErr == nil && tt.wantError == nil) {
					t.Errorf("buildOutputFilename() error = %v, want %v", gotErr, tt.wantError)
				}
			}
		})
	}
}