<?php

// Note: this script is expected to return a stringified JSON representation of the slack message
// avoid any echo or print commands other than the final one

define( 'CHANGELOG_JSON', getenv( 'CHANGELOG_JSON' ) );
define( 'CHANGELOG_STRING', getenv( 'CHANGELOG_STRING' ) );
define( 'PROJECT', getenv( 'PROJECT' ) );

$values = getopt(
	'',
	array(
		'version:',
		'repo:',
		'out:',
	)
);

if ( ! isset( $values['version'] ) ) {
	echo 'version is empty!';
	exit( 1 );
}

if ( ! isset( $values['repo'] ) ) {
	echo 'repo is empty!';
	exit( 1 );
}

if ( ! isset( $values['out'] ) ) {
	echo 'out is empty! please specify output filename';
	exit( 1 );
}

$slack_payload_blocks = array(
	array(
		'type' => 'divider',
	),
	array(
		'type' => 'header',
		'text' => array(
			'type' => 'plain_text',
			'text' => PROJECT . " GitHub Release.\n",
		),
	),
	array(
		'type' => 'section',
		'text' => array(
			'type' => 'mrkdwn',
			'text' => "You can <https://github.com/{$values['repo']}/releases/tag/{$values['version']}|check the release here>.\n",
		),
	),
	array(
		'type' => 'section',
		'text' => array(
			'type' => 'mrkdwn',
			'text' => ":white_check_mark: 4.{$values['version']}\n:white_check_mark: 3.{$values['version']}\n:white_check_mark: 2.{$values['version']}\n:no_entry: 1.{$values['version']} (will be released separately)\n",
		),
	),
);

$pattern = '/PR:#(\d+)(.*)/';

try {
	foreach ( json_decode( CHANGELOG_JSON ) as $key => $array_of_prs ) {
		$formatted_key          = str_replace( '##', '', $key );
		$slack_payload_blocks[] = array(
			'type' => 'header',
			'text' => array(
				'type' => 'plain_text',
				'text' => $formatted_key,
			),
		);

		foreach ( $array_of_prs as $pr ) {
			preg_match( $pattern, $pr, $matches );
			$pr_number              = $matches[1];
			$pr_title               = $matches[2];
			$slack_payload_blocks[] = array(
				'type' => 'section',
				'text' => array(
					'type' => 'mrkdwn',
					'text' => "<https://github.com/{$values['repo']}/pull/{$pr_number}|$pr_number> $pr_title",
				),
			);
		}
	}
} catch ( \Throwable $th ) {
	echo 'Failed to parse CHANGELOG_JSON';
}

$slack_payload = array(
	'text'   => "\n\n\n" . PROJECT . " GitHub Release {$values['version']}\nChangelog:\n" . CHANGELOG_STRING,
	'blocks' => $slack_payload_blocks,
);

$json = json_encode( $slack_payload, JSON_PRETTY_PRINT );
$fp   = fopen( $values['out'], 'w' );
fwrite( $fp, $json );
fclose( $fp );