<?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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