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

/////////////////////////////////////////////////////////////////////////////////
// Bootstrap.

$PHABRICATOR_ROOT = dirname(dirname(dirname(__FILE__)));
require_once $PHABRICATOR_ROOT.'/scripts/__init_script__.php';

/////////////////////////////////////////////////////////////////////////////////
// Command line.

if (count($argv) != 3) {
  print("Usage: $argv[0] <conduit_token_file> <output_directory>\n");
  die;
}

$CONDUIT_TOKEN_FILE = $argv[1];
$OUTPUT_DIR = $argv[2];

/////////////////////////////////////////////////////////////////////////////////
// Global configuration.

$HOST = 'phabricator.local';

/////////////////////////////////////////////////////////////////////////////////
// Utilities.

// Create an instance of the AphrontApplicationConfiguration configured with all
// invariant settings (settings which do not change between handlers of different
// revisions).
function CreateApplicationConfiguration() {
  global $HOST;

  $application_configuration = new AphrontApplicationConfiguration();
  $application_configuration->setHost($HOST);
  return $application_configuration;
}

/////////////////////////////////////////////////////////////////////////////////
// Global state.

$site = id(new PhabricatorPlatformSite());

$viewer = PhabricatorUser::getOmnipotentUser();

$application_configuration = CreateApplicationConfiguration();

$differential_application = id(new PhabricatorDifferentialApplication());
$revision_controller = id(new DifferentialRevisionViewController())
  ->setCurrentApplication($differential_application);

$maniphest_application = id(new PhabricatorManiphestApplication());
$maniphest_controller = id(new ManiphestTaskDetailController())
  ->setCurrentApplication($maniphest_application);

$differential_routing_map = id(new AphrontRoutingMap())
  ->setSite($site)
  ->setApplication($differential_application)
  ->setRoutes($differential_application->getRoutes());

$maniphest_routing_map = id(new AphrontRoutingMap())
  ->setSite($site)
  ->setApplication($maniphest_application)
  ->setRoutes($maniphest_application->getRoutes());

$conduit = id(new ConduitClient('https://developer.blender.org/api/'))
  ->setConduitToken(trim(file_get_contents($CONDUIT_TOKEN_FILE)));

/////////////////////////////////////////////////////////////////////////////////
// Baking utilities.

function EnsureDirectoryOrDie($dir) {
  if (!is_dir($dir)) {
    if (!mkdir($dir, 0777, true)) {
      print("Error creating output durectory $dir\n");
      die;
    }
  }
}

function RenderElement($element) {
  if (is_array($element)) {
    $html = '';
    foreach ($element as $child) {
      $html .=  RenderElement($child);
    }
    return $html;
  }

  return $element->render();
}

function RenderResponseToHTML($response) {
  $html = '';

  $crumbs = $response->getCrumbs();
  if ($crumbs) {
    $html .= $crumbs->render();
  }

  foreach ($response->renderChildren() as $child) {
    $html .=  RenderElement($child);
  }

  return $html;
}

/////////////////////////////////////////////////////////////////////////////////
// Revision baking.

class RevisionInfo {
  public $title = '';
  public $page_title = '';

  public $last_diff_id = 0;

  public $hash = '';

  public static function ReadFromFile($file_name) {
    $info = new RevisionInfo();

    if (!file_exists($file_name)) {
      return $info;
    }

    $json = json_decode(file_get_contents($file_name));
    foreach ($json as $key => $value) {
      $info->{$key} = $value;
    }

    return $info;
  }

  public function SaveToFile($file_name) {
    $json_str = json_encode(get_object_vars($this));
    file_put_contents($file_name, $json_str);
  }
};

function GetRevisionOutputDirectory($revision) {
  global $OUTPUT_DIR;

  $id = $revision->getID();

  return PathJoin(array($OUTPUT_DIR, 'differential', SubpathFromId($id)));
}

function EnsureRevisionOutputDirectory($revision) {
  $dir = GetRevisionOutputDirectory($revision);

  EnsureDirectoryOrDie($dir);
  EnsureDirectoryOrDie(PathJoin(array($dir, 'raw_diff')));

  return $dir;
}

function GetRevisionInfoFilename($revision) {
  $revision_dir = GetRevisionOutputDirectory($revision);
  return PathJoin(array($revision_dir, 'info.json'));
}

function GetRevisionHTMLFilename($revision, $diff_id) {
  $revision_id = $revision->getID();
  $revision_dir = GetRevisionOutputDirectory($revision);

  $file_name = "D{$revision_id}.id{$diff_id}.html";

  return PathJoin(array($revision_dir, $file_name));
}

function GetRevisionRawDiffFilename($revision, $diff_id) {
  $revision_id = $revision->getID();
  $revision_dir = GetRevisionOutputDirectory($revision);

  $file_name = "D{$revision_id}.id{$diff_id}.diff";

  return PathJoin(array($revision_dir, 'raw_diff', $file_name));
}

function RenderDifferentialToResponse($revision, $diff_id) {
  global $application_configuration;
  global $revision_controller;
  global $differential_routing_map;
  global $viewer;

  $revision_id = $revision->getID();

  $path = '/D' . $revision_id;

  $route_result = $differential_routing_map->routePath($path);
  $uri_data = $route_result->getURIData();

  $application_configuration->setPath($path);

  $request_data = array(
    'id' => $diff_id,
  );

  $request = $application_configuration->buildRequest()
    ->setUser($viewer)
    ->setRequestData($request_data)
    ->setURIMap($uri_data);

  $response = id($revision_controller)
    ->setRequest($request)
    ->handleRequest($request);

  return $response;
}

function StoreRawDiff($revision, $diff_id) {
  global $viewer;
  global $conduit;

  $diff = id(new DifferentialDiffQuery())
    ->setViewer($viewer)
    ->withIDs(array($diff_id))
    ->needChangesets(true)
    ->executeOne();

  $raw_changes = $diff->buildChangesList();

  $changes = array();
  foreach ($raw_changes as $changedict) {
    $changes[] = ArcanistDiffChange::newFromDictionary($changedict);
  }

  $bundle = ArcanistBundle::newFromChanges($changes);
  $bundle->setConduit($conduit);
  $raw_diff = $bundle->toGitPatch();

  $output_file = GetRevisionRawDiffFilename($revision, $diff_id);
  file_put_contents($output_file, $raw_diff);
}

function GetRevisionHash($revision) {
  global $viewer;

  $xaction = id(new DifferentialTransactionQuery())
    ->setViewer($viewer)
    ->withObjectPHIDs(array($revision->getPHID()))
    ->setOrder('newest')
    ->setLimit(1)
    ->executeOne();

  $digest = '';

  $digest .= $revision->getDateModified();

  if ($xaction) {
    $digest .= '_' . $xaction->getPHID();
    $digest .= '_' . $xaction->getDateModified();
  }

  return $digest;
}

function NeedBakeRevision($info, $revision, $diff_id) {
  if (!file_exists(GetRevisionHTMLFilename($revision, $diff_id))) {
    return true;
  }
  if (!file_exists(GetRevisionRawDiffFilename($revision, $diff_id))) {
    return true;
  }

  if ($info->last_diff_id < $diff_id) {
    return true;
  }

  if ($revision->getTitle() != $info->title) {
    return true;
  }

  if (GetRevisionHash($revision) != $info->hash) {
    return true;
  }

  return false;
}

function BakeRevision($revision, $diff_id) {
  $revision_id = $revision->getID();

  printf('Baking D' . $revision_id . '?id=' . $diff_id . ' ...' . "\n");

  $info_file_name = GetRevisionInfoFilename($revision);

  $info = RevisionInfo::ReadFromFile($info_file_name);

  if (!NeedBakeRevision($info, $revision, $diff_id)) {
    print('  ... ignoring: up to date' . "\n");
    return;
  }

  $response = RenderDifferentialToResponse($revision, $diff_id);

  $html = RenderResponseToHTML($response);
  $html_file_name = GetRevisionHTMLFIlename($revision, $diff_id);
  file_put_contents($html_file_name, $html);

  StoreRawDiff($revision, $diff_id);

  $info->title = $revision->getTitle();
  $info->page_title = $response->getTitle();
  $info->hash = GetRevisionHash($revision);
  $info->last_diff_id = max($info->last_diff_id, $diff_id);

  $info->SaveToFile($info_file_name);
}

/////////////////////////////////////////////////////////////////////////////////
// Task baking.

class TaskInfo {
  public $title = '';
  public $page_title = '';

  public $hash = '';

  public static function ReadFromFile($file_name) {
    $info = new TaskInfo();

    if (!file_exists($file_name)) {
      return $info;
    }

    $json = json_decode(file_get_contents($file_name));
    foreach ($json as $key => $value) {
      $info->{$key} = $value;
    }

    return $info;
  }

  public function SaveToFile($file_name) {
    $json_str = json_encode(get_object_vars($this));
    file_put_contents($file_name, $json_str);
  }
};

function GetTaskOutputDirectory($task) {
  global $OUTPUT_DIR;

  $id = $task->getID();

  return PathJoin(array($OUTPUT_DIR, 'maniphest', SubpathFromId($id)));
}

function EnsureTaskOutputDirectory($task) {
  $dir = GetTaskOutputDirectory($task);

  EnsureDirectoryOrDie($dir);

  return $dir;
}

function GetTaskInfoFilename($task) {
  $task_dir = GetTaskOutputDirectory($task);
  return PathJoin(array($task_dir, 'info.json'));
}

function GetTaskHTMLFilename($task) {
  $task_id = $task->getID();
  $task_dir = GetTaskOutputDirectory($task);

  $file_name = "index.html";

  return PathJoin(array($task_dir, $file_name));
}

function RenderTaskToResponse($task) {
  global $application_configuration;
  global $maniphest_routing_map;
  global $viewer;
  global $maniphest_controller;

  $task_id = $task->getID();

  $path = '/T' . $task_id;

  $route_result = $maniphest_routing_map->routePath($path);
  $uri_data = $route_result->getURIData();

  $application_configuration->setPath($path);

  $request_data = array(
  );

  $request = $application_configuration->buildRequest()
    ->setUser($viewer)
    ->setRequestData($request_data)
    ->setURIMap($uri_data);

  $response = id($maniphest_controller)
    ->setRequest($request)
    ->handleRequest($request);

  return $response;
}

function GetTaskHash($task) {
  global $viewer;

  $xaction = id(new DifferentialTransactionQuery())
    ->setViewer($viewer)
    ->withObjectPHIDs(array($task->getPHID()))
    ->setOrder('newest')
    ->setLimit(1)
    ->executeOne();

  $digest = '';

  $digest .= $task->getDateModified();

  if ($xaction) {
    $digest .= '_' . $xaction->getPHID();
    $digest .= '_' . $xaction->getDateModified();
  }

  return $digest;
}

function NeedBakeTask($info, $task) {
  if (!file_exists(GetTaskHTMLFilename($task))) {
    return true;
  }

  if ($task->getTitle() != $info->title) {
    return true;
  }

  if (GetTaskHash($task) != $info->hash) {
    return true;
  }

  return false;
}

function BakeTask($task) {
  $task_id = $task->getID();

  printf('Baking T' . $task_id . ' ...' . "\n");

  $info_file_name = GetTaskInfoFilename($task);

  $info = TaskInfo::ReadFromFile($info_file_name);

  if (!NeedBakeTask($info, $task)) {
    print('  ... ignoring: up to date' . "\n");
    return;
  }

  $response = RenderTaskToResponse($task);

  $html = RenderResponseToHTML($response);

  $html_file_name = GetTaskHTMLFIlename($task);
  file_put_contents($html_file_name, $html);

  $info->title = $task->getTitle();
  $info->page_title = $response->getTitle();
  $info->hash = GetTaskHash($task);

  $info->SaveToFile($info_file_name);
}

/////////////////////////////////////////////////////////////////////////////////
// Baking main loop.

print('Querying differential revisions from the database ... ' . "\n");
$revisions = id(new DifferentialRevisionQuery())
  ->setViewer($viewer)
  ->needDiffIDs(true)
  ->setOrder('oldest')
  ->execute();

foreach ($revisions as $revision_id => $revision) {
  EnsureRevisionOutputDirectory($revision);

  foreach ($revision->getDiffIDs() as $diff_id) {
    BakeRevision($revision, $diff_id);
  }
}

print("\n");
print('Querying maniphest tasks from the database ... ' . "\n");
$tasks = id(new ManiphestTaskQuery())
  ->setViewer($viewer)
  ->setOrder('oldest')
  ->execute();

foreach ($tasks as $task_id => $task) {
  EnsureTaskOutputDirectory($task);
  BakeTask($task);
}

?>