<?php

include_once("monoformat_schema.php");
include_once("monoformat_structured.php");

if (count($argv) != 4) {
    fwrite(STDERR, "Usage: $argv[0] binfile index outprefix\n");
    exit(1);
}

$binfile = $argv[1];
$index = (int) $argv[2];
$outprefix = $argv[3];

$file = monoformat\parseFile(file_get_contents($binfile));
$animations = [];
foreach ($file->sections as $section) {
    for ($i = 0; $i < $section->elementCount(); ++$i) {
        $element = $section->elementAt($i);
        if ($element->elementType() == monoformat\ElementType::Animation) {
            array_push($animations, $element);
        }
    }
}

if ($index < 0 || $index >= count($animations)) {
    $n = count($animations);
    $nm1 = $n - 1;
    fwrite(STDERR, "$argv[0]: the animation file contains $n animations, index $index is invalid (must be 0 .. $nm1)\n");
    exit(2);
}

$animation = $animations[$index];
$height = $animation->height();
$width = $animation->width();

$nFrames = $animation->numberOfFrames();
for ($f = 0; $f < $nFrames; ++$f) {
    $outfile = sprintf("%s_%04d.png", $outprefix, $f);
    print("Writing $outfile...\n");
    $input = $animation->image($f);
    $image = imagecreatetruecolor($width, $height);
    $bg = imagecolorallocate($image, 0, 0, 0);
    $fg = imagecolorallocate($image, 255, 255, 255);
    for ($y = 0; $y < $height; ++$y) {
        for ($x = 0; $x < $width; ++$x) {
            $i = $y * $width + $x;
            if ($input[$i]) {
                imagesetpixel($image, $x, $y, $fg);
            } else {
                imagesetpixel($image, $x, $y, $bg);
            }
        }
    }
    imagepng($image, $outfile);
}

?>