#!/usr/bin/env php
<?php
/**
 * phoogle is a tool to locate functions based on their signatures.
 *
 * @phan-file-suppress PhanPluginRemoveDebugAny
 */

use Phan\CLIBuilder;
use Phan\Phan;

/**
 * Print usage for phoogle and exit.
 * @return never
 */
function phoogle_usage(int $status) : void {
    global $argv;
    $program = $argv[0];
    fwrite($status !== 0 ? STDERR : STDOUT, <<<EOT
Usage: $program [options] 'paramType1 -> paramType2 -> returnType'

Options:
  -h, --help: Print this help message to stdout.
  -p, --progress-bar: Show a progress bar.
  -l, --limit <count>: Number of search results to show (defaults to 10)
                       Set this to -1 for all results.

Examples:

  Look for user-defined or internal functions returning an array of reflection methods
    $program 'ReflectionMethod[]'

  Look for functions that return a string, given a string and an array

    $program 'string -> array -> string'

  Look for all functions that can be used to get a method (\\Phan\\Language\\Element\\Method) from a CodeBase (\\Phan\\CodeBase)
  (Assumes Phan is in the parsed file list)

    $program --limit -1 'CodeBase->Method'

Notes:

  The order of the parameters is deliberately ignored.

  More CLI options will be added in the future.

EOT
    );
    exit($status);
}
call_user_func(static function () : void {
    global $argv;
    $options = getopt(
        "hpl:",
        [
            'help',
            'progress-bar',
            'limit:',
        ],
        $optind
    );
    $has_any_option = static function (string ...$arg_names) use ($options) : bool {
        foreach ($arg_names as $arg) {
            if (array_key_exists($arg, $options)) {
                return true;
            }
        }
        return false;
    };

    if ($has_any_option('h', 'help')) {
        phoogle_usage(0);
        return;
    }
    $remaining_argv = array_slice($argv, $optind);
    if (count($remaining_argv) !== 1) {
        fwrite(STDERR, "ERROR: Expected 1 argument with the function/method signature to search for, got " . count($remaining_argv) . "\n");
        phoogle_usage(1);
    }

    require_once(__DIR__ . '/../src/Phan/Bootstrap.php');

    $cli_builder = new CLIBuilder();
    if ($has_any_option('p', 'progress-bar')) {
        $cli_builder->setOption('progress-bar');
    }
    $limit_raw = $options['limit'] ?? $options['l'] ?? '10';
    if (is_string($limit_raw)) {
        $limit = filter_var($limit_raw, FILTER_VALIDATE_INT);
        if ($limit === -1) {
            $limit = PHP_INT_MAX;
        } elseif ($limit <= 0) {
            echo "ERROR: limit must be a positive integer, got $limit_raw\n";
            phoogle_usage(1);
        }
        $_ENV['PHOOGLE_LIMIT'] = $limit;
    }
    $cli_builder->setOption('find-signature', $remaining_argv[0]);
    // @phan-suppress-next-line PhanThrowTypeAbsentForCall
    $cli = $cli_builder->build();
    // Generate codebase info after parsing configs (e.g. included_extension_subset)
    $code_base = require(__DIR__ . '/../src/codebase.php');

    // @phan-suppress-next-line PhanThrowTypeAbsentForCall
    Phan::analyzeFileList($code_base, /** @return string[] */ static function () use($cli) : array {
        return $cli->getFileList();
    });
});