<?php

namespace CCL;

class Functions
{
	/**
	 * Assert that we are properly executing within the context of a compilation task.
	 *
	 * If this script tries to run in any other context, then you will get some
	 * kind of error (e.g. class not found or RuntimeException).
	 */
	public function assertTask()
	{
		\Civi\CompilePlugin\Util\Script::assertTask();
	}


	/**
	 * Array-map function. Similar to array_map(), but tuned to key-value pairs.
	 *
	 * Example:
	 *   $data = [100 => 'apple', 200 => 'banana'];
	 *   $opposite = mapkv($data, function($k, $v){ return [-1 * $k => strtoupper($v)]; });
	 *
	 * This would return [-100 => 'APPLE', -200 => 'BANANA']
	 *
	 * By convention, mapping functions should return an 1-row array "[newKey => newValue]".
	 *
	 * Some unconventional forms are also defined:
	 *  - Return empty array ==> Skip/omit the row
	 *  - Return multiple items ==> Add all items to the result
	 *  - Return an unkeyed (numeric) array ==> Discard original keys. Items are appended numerically (`$arr[] = $value`).
	 *
	 * @param array $array
	 *   Values to iterate over
	 * @param callable $func
	 *   Callback function.
	 *   function(scalar $key, mixed $value): array
	 * @return array
	 *   The filtered array.
	 */
	public function mapkv($array, $func)
	{
		$r = [];
		foreach ($array as $k => $v) {
		  foreach ($func($k, $v) as $out_k => $out_v) {
		if (isset($r[$out_k])) {
		  $r[] = $out_v;
		}
		else {
		  $r[$out_k] = $out_v;
		}
		  }
		}
		return $r;
	}


	/**
	 * Map file-names.
	 *
	 * @param string $matchPat
	 *   Ex: 'src/*.json'
	 * @param string $outPat
	 *   Ex: 'dest/#1.json'
	 * @param bool $flip
	 *   The orientation of the result map.
	 *   If false, returned as "original => filtered".
	 *   If true, returned as "filtered => original".
	 * @return array
	 *   List of files and the corresponding names.
	 */
	public function globMap($matchPat, $outPat, $flip = FALSE)
	{
		$inFiles = glob($matchPat);
		$regex = ';' . preg_quote($matchPat, ';') . ';';
		$regex = str_replace(preg_quote('*', ';'), '(.*)', $regex);
		$replacement = preg_replace(';#(\d+);', '\\' . '\\\1', $outPat);
		$outFiles = preg_replace($regex, $replacement, $inFiles);
		return $flip ? array_combine($outFiles, $inFiles) : array_combine($inFiles, $outFiles);
	}


	public function chdir($directory)
	{
		if (!\chdir($directory)) {
		  throw new IOException("Failed to change directory ($directory)");
		}
	}


	/**
	 * @param string|string[] $pats
	 *   List of glob patterns.
	 * @param null|int $flags
	 * @return array
	 *   List of matching files.
	 */
	public function glob($pats, $flags = NULL)
	{
		$r = [];
		$pats = (array) $pats;
		foreach ($pats as $pat) {
		  $r = array_unique(array_merge($r, (array) \glob($pat, $flags)));
		}
		sort($r);
		return $r;
	}


	/**
	 * Read a set of files and concatenate the results
	 *
	 * @param string|string[] $srcs
	 *   Files to read. These may be globs.
	 * @param string $newLine
	 *   Whether to ensure that joined files have a newline separator.
	 *   Ex: 'raw' (as-is), 'auto' (add if missing)
	 * @return string
	 *   The result of joining the files.
	 */
	public function cat($srcs, $newLine = 'auto')
	{
		$buf = '';
		foreach (glob($srcs) as $file) {
		  if (!is_readable($file)) {
		throw new \RuntimeException("Cannot read $file");
		  }
		  $buf .= file_get_contents($file);
		  switch ($newLine) {
		case 'auto':
		  if (substr($buf, -1) !== "\n") {
		    $buf .= "\n";
		  }
		  break;

		case 'raw':
		  // Don't
		  break;
		  }
		}
		return $buf;
	}
}
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