#!/usr/bin/env php
<?php

/*
 * Copyright 2011 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

require_once dirname(__FILE__).'/__init_script__.php';

if ($argc != 2) {
  $self = basename($argv[0]);
  echo "usage: {$self} <phutil_library_root>\n";
  exit(1);
}

phutil_require_module('phutil', 'filesystem');
phutil_require_module('phutil', 'future/exec');

$root = Filesystem::resolvePath($argv[1]);

if (!@file_exists($root.'/__phutil_library_init__.php')) {
  throw new Exception("Provided path is not a phutil library.");
}

echo "Finding phutil modules...\n";

list($stdout) = execx(
  "(cd %s && find . -type d -path '*/.*' -prune -o -type d -print0)",
  $root);

$futures = array();
foreach (array_filter(explode("\0", $stdout)) as $dir) {
  if ($dir == '.') {
    continue;
  }
  $module = preg_replace('@^\\./@', '', $dir);
  $futures[$module] = new ExecFuture(
    '%s %s',
    dirname(__FILE__).'/phutil_analyzer.php',
    $root.'/'.$module);
}

echo "Analyzing ".number_format(count($futures))." modules";
$class_map = array();
$requires_class_map = array();
$requires_interface_map = array();
$function_map = array();
foreach (Futures($futures)->limit(16) as $module => $future) {
  echo ".";
  $spec = $future->resolveJSON();
  foreach (array('class', 'interface') as $type) {
    foreach ($spec['declares'][$type] as $class => $where) {
      if (!empty($class_map[$class])) {
        $prior = $class_map[$class];
        echo "\n";
        echo "Error: definition of {$type} '{$class}' in module '{$module}' ".
             "duplicates prior definition in module '{$prior}'.";
        echo "\n";
        exit(1);
      }
      $class_map[$class] = $module;
    }
  }
  if (!empty($spec['chain']['class'])) {
    $requires_class_map += $spec['chain']['class'];
  }
  if (!empty($spec['chain']['interface'])) {
    $requires_interface_map += $spec['chain']['interface'];
  }
  foreach ($spec['declares']['function'] as $function => $where) {
    if (!empty($function_map[$function])) {
      $prior = $function_map[$function];
      echo "\n";
      echo "Error: definition of function '{$function}' in module '{$module}' ".
           "duplicates prior definition in module '{$prior}'.";
      echo "\n";
      exit(1);
    }
    $function_map[$function] = $module;
  }
}
echo "\n";

ksort($class_map);
ksort($requires_class_map);
ksort($requires_interface_map);
ksort($function_map);

$library_map = array(
  'class' => $class_map,
  'function' => $function_map,
  'requires_class' => $requires_class_map,
  'requires_interface' => $requires_interface_map,
);
$library_map = var_export($library_map, $return_string = true);
$library_map = preg_replace('/\s+$/m', '', $library_map);
$library_map = preg_replace('/array \(/', 'array(', $library_map);

$at = '@';
$map_file = <<<EOPHP
<?php

/**
 * This file is automatically generated. Use 'phutil_mapper.php' to rebuild it.
 * {$at}generated
 */

phutil_register_library_map({$library_map});

EOPHP;

echo "Writing library map file...\n";

Filesystem::writeFile($root.'/__phutil_library_map__.php', $map_file);

echo "Done.\n";