// +build test

/*
DESCRIPTION
  revid_test.go provides integration testing of the revid API.

AUTHORS
  Saxon A. Nelson-Milton <saxon@ausocean.org>

LICENSE
  Copyright (C) 2017-2021 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  for more details.

  You should have received a copy of the GNU General Public License
  in gpl.txt.  If not, see http://www.gnu.org/licenses.
*/

package revid

import (
	"bytes"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"testing"
	"time"

	"bitbucket.org/ausocean/av/container/mts"
	"bitbucket.org/ausocean/av/container/mts/meta"
	"bitbucket.org/ausocean/av/revid/config"
)

func TestRaspistill(t *testing.T) {
	// Copyright information prefixed to all metadata.
	const (
		metaPreambleKey  = "copyright"
		metaPreambleData = "ausocean.org/license/content2021"
	)

	// Configuration parameters.
	const (
		timelapseInterval    = "4"
		timelapseDuration    = "25"
		poolStartElementSize = "1000000"
		input                = "Raspistill"
		codec                = "JPEG"
		output               = "Files"
		outDir               = "out"
		outputPath           = outDir + "/"
		logging              = "Debug"
		testImgDir           = "../../../test/test-data/av/input/jpeg/"
	)

	const runTime = 40 * time.Second

	// Add the copyright metadata.
	mts.Meta = meta.NewWith([][2]string{{metaPreambleKey, metaPreambleData}})

	// First remove out dir (if exists) to clear contents, then create dir.
	err := os.RemoveAll(outDir)
	if err != nil {
		t.Fatalf("could not remove any prior out directory: %v", err)
	}

	os.Mkdir(outDir, os.ModePerm)
	if err != nil {
		t.Fatalf("could not create new out directory: %v", err)
	}

	rv, err := New(config.Config{Logger: (*testLogger)(t)}, nil)
	if err != nil {
		t.Fatalf("did not expect error from revid.New(): %v", err)
	}

	err = rv.Update(
		map[string]string{
			config.KeyInput:                input,
			config.KeyInputCodec:           codec,
			config.KeyOutput:               output,
			config.KeyOutputPath:           outputPath,
			config.KeyTimelapseInterval:    timelapseInterval,
			config.KeyTimelapseDuration:    timelapseDuration,
			config.KeyLogging:              logging,
			config.KeyPoolStartElementSize: poolStartElementSize,
		},
	)
	if err != nil {
		t.Fatalf("did not expect error from rv.Update(): %v", err)
	}

	err = rv.Start()
	if err != nil {
		t.Fatalf("did not expect error from rv.Start(): %v", err)
	}
	time.Sleep(runTime)
	rv.Stop()

	// Get output file information.
	os.Chdir(outDir)
	var files []string
	err = filepath.Walk(
		".",
		func(path string, info os.FileInfo, err error) error {
			files = append(files, path)
			return nil
		},
	)
	if err != nil {
		t.Fatalf("did not expect error from filepath.Walk(): %v", err)
	}

	if len(files) == 0 {
		t.Fatalf("did not expect 0 output files")
	}

	// Load files outputted files and compare each one with corresponding input.
	for i, n := range files {
		// Ignore first file (which is prev dir ".").
		if i == 0 {
			continue
		}

		mtsBytes, err := ioutil.ReadFile(n)
		if err != nil {
			t.Fatalf("could not read output file: %v", err)
		}

		clip, err := mts.Extract(mtsBytes)
		if err != nil {
			t.Fatalf("could not extract clips from MPEG-TS stream: %v", err)
		}
		img := clip.Bytes()

		inImg, err := ioutil.ReadFile(testImgDir + strconv.Itoa(i) + ".jpg")
		if err != nil {
			t.Fatalf("could not load input test image: %v", err)
		}

		if !bytes.Equal(img, inImg) {
			t.Errorf("unexpected image extracted for img: %d", i)
		}
	}

	// Clean up out directory.
	err = os.RemoveAll(outDir)
	if err != nil {
		t.Fatalf("could not clean up out directory: %v", err)
	}
}