<?php

# Copyright (c) 2012 John Reese
# Licensed under the MIT license

if ( false === include_once( config_get( 'plugin_path' ) . 'Source/MantisSourcePlugin.class.php' ) ) {
	return;
}

class SourceSVNPlugin extends MantisSourcePlugin {
	public function register() {
		$this->name = plugin_lang_get( 'title' );
		$this->description = plugin_lang_get( 'description' );

		$this->version = '0.19';
		$this->requires = array(
			'MantisCore' => '1.2.0',
			'Source' => '0.16',
		);

		$this->author = 'John Reese';
		$this->contact = 'john@noswap.com';
		$this->url = 'http://noswap.com';
	}

	public function config() {
		return array(
			'svnpath' => '',
			'svnargs' => '',
			'svnssl' => false,
			'winstart' => false,
		);
	}

	public function errors() {
		return array(
			'SVNPathInvalid' => 'Path to Subversion binary invalid or inaccessible',
		);
	}

	public $type = 'svn';

	public $configuration = true;

	public function show_type() {
		return plugin_lang_get( 'svn' );
	}

	public function show_changeset( $p_repo, $p_changeset ) {
		return "$p_changeset->branch r$p_changeset->revision";
	}

	public function show_file( $p_repo, $p_changeset, $p_file ) {
		return $p_file->action . ' - ' . $p_file->filename;
	}

	public function url_repo( $p_repo, $p_changeset=null ) {}

	public function url_changeset( $p_repo, $p_changeset ) {}

	public function url_file( $p_repo, $p_changeset, $p_file ) {}

	public function url_diff( $p_repo, $p_changeset, $p_file ) {}

	public function update_repo_form( $p_repo ) {
		$t_svn_username = isset( $p_repo->info['svn_username'] ) ? $p_repo->info['svn_username'] : '';
		$t_svn_password = isset( $p_repo->info['svn_password'] ) ? $p_repo->info['svn_password'] : '';
		$t_standard_repo = isset( $p_repo->info['standard_repo'] ) ? $p_repo->info['standard_repo'] : '';
		$t_trunk_path = isset( $p_repo->info['trunk_path'] ) ? $p_repo->info['trunk_path'] : '';
		$t_branch_path = isset( $p_repo->info['branch_path'] ) ? $p_repo->info['branch_path'] : '';
		$t_tag_path = isset( $p_repo->info['tag_path'] ) ? $p_repo->info['tag_path'] : '';
		$t_ignore_paths = isset( $p_repo->info['ignore_paths'] ) ? $p_repo->info['ignore_paths'] : '';

?>
<tr>
<td class="category"><?php echo plugin_lang_get( 'svn_username' ) ?></td>
<td><input name="svn_username" maxlength="250" size="40" value="<?php echo string_attribute( $t_svn_username ) ?>"/></td>
</tr>
<tr>
<td class="category"><?php echo plugin_lang_get( 'svn_password' ) ?></td>
<td><input name="svn_password" maxlength="250" size="40" value="<?php echo string_attribute( $t_svn_password ) ?>"/></td>
</tr>
<tr>
<td class="category"><?php echo plugin_lang_get( 'standard_repo' ) ?></td>
<td><input name="standard_repo" type="checkbox" <?php echo ($t_standard_repo ? 'checked="checked"' : '') ?>/></td>
</tr>
<tr>
<td class="category"><?php echo plugin_lang_get( 'trunk_path' ) ?></td>
<td><input name="trunk_path" maxlength="250" size="40" value="<?php echo string_attribute( $t_trunk_path ) ?>"/></td>
</tr>
<tr>
<td class="category"><?php echo plugin_lang_get( 'branch_path' ) ?></td>
<td><input name="branch_path" maxlength="250" size="40" value="<?php echo string_attribute( $t_branch_path ) ?>"/></td>
</tr>
<tr>
<td class="category"><?php echo plugin_lang_get( 'tag_path' ) ?></td>
<td><input name="tag_path" maxlength="250" size="40" value="<?php echo string_attribute( $t_tag_path ) ?>"/></td>
</tr>
<tr>
<td class="category"><?php echo plugin_lang_get( 'ignore_paths' ) ?></td>
<td><input name="ignore_paths" type="checkbox" <?php echo ($t_ignore_paths ? 'checked="checked"' : '') ?>/></td>
</tr>
<?php
	}

	public function update_repo( $p_repo ) {
		$p_repo->info['svn_username'] = gpc_get_string( 'svn_username' );
		$p_repo->info['svn_password'] = gpc_get_string( 'svn_password' );
		$p_repo->info['standard_repo'] = gpc_get_bool( 'standard_repo', false );
		$p_repo->info['trunk_path'] = gpc_get_string( 'trunk_path' );
		$p_repo->info['branch_path'] = gpc_get_string( 'branch_path' );
		$p_repo->info['tag_path'] = gpc_get_string( 'tag_path' );
		$p_repo->info['ignore_paths'] = gpc_get_bool( 'ignore_paths', false );

		return $p_repo;
	}

	private static $config_form_handled = false;

	public function update_config_form() {
		# Prevent more than one SVN class from outputting form elements.
		if ( !SourceSVNPlugin::$config_form_handled ) {
			SourceSVNPlugin::$config_form_handled = true;

			$t_svnpath = plugin_config_get( 'svnpath', '' );
			$t_svnargs = plugin_config_get( 'svnargs', '' );
			$t_svnssl = plugin_config_get( 'svnssl', '' );
			$t_winstart = plugin_config_get( 'winstart', '' );

?>
<tr <?php echo helper_alternate_class() ?>>
<td class="category"><?php echo plugin_lang_get( 'svnpath' ) ?></td>
<td><input name="plugin_SourceSVN_svnpath" value="<?php echo string_attribute( $t_svnpath ) ?>" size="40"/></td>
</tr>
<tr <?php echo helper_alternate_class() ?>>
<td class="category"><?php echo plugin_lang_get( 'svnargs' ) ?></td>
<td><input name="plugin_SourceSVN_svnargs" value="<?php echo string_attribute( $t_svnargs ) ?>" size="40"/></td>
</tr>
<tr <?php echo helper_alternate_class() ?>>
<td class="category"><?php echo plugin_lang_get( 'svnssl' ) ?></td>
<td><input name="plugin_SourceSVN_svnssl" type="checkbox" <?php if ( $t_svnssl ) echo 'checked="checked"' ?>/></td>
</tr>
<tr <?php echo helper_alternate_class() ?>>
<td class="category"><?php echo plugin_lang_get( 'winstart' ) ?></td>
<td><input name="plugin_SourceSVN_winstart" type="checkbox" <?php if ( $t_winstart ) echo 'checked="checked"' ?>/></td>
</tr>
<?php
		}
	}

	public function update_config() {
		# Prevent more than one SVN class from handling form elements.
		if ( !SourceSVNPlugin::$config_form_handled ) {
			SourceSVNPlugin::$config_form_handled = true;

			$f_svnpath = gpc_get_string( 'plugin_SourceSVN_svnpath', '' );
			$t_svnpath = plugin_config_get( 'svnpath', '' );

			$f_svnpath = rtrim( $f_svnpath, DIRECTORY_SEPARATOR );

			if ( $f_svnpath != $t_svnpath ) {
				if ( is_blank( $f_svnpath ) ) {
					plugin_config_delete( 'svnpath' );

				} else {
					# be sure that the path is valid
					if ( ( $t_binary = SourceSVNPlugin::svn_binary( $f_svnpath, true ) ) != 'svn' ) {
						plugin_config_set( 'svnpath', $f_svnpath );
					} else {
						plugin_error( 'SVNPathInvalid', ERROR );
					}
				}
			}

			$f_svnargs = gpc_get_string( 'plugin_SourceSVN_svnargs', '' );
			if ( $f_svnargs != plugin_config_get( 'svnargs', '' ) ) {
				plugin_config_set( 'svnargs', $f_svnargs );
			}

			$f_svnssl = gpc_get_bool( 'plugin_SourceSVN_svnssl', false );
			if ( $f_svnssl != plugin_config_get( 'svnssl', false ) ) {
				plugin_config_set( 'svnssl', $f_svnssl );
			}

			$f_winstart = gpc_get_bool( 'plugin_SourceSVN_winstart', false );
			if ( $f_winstart != plugin_config_get( 'winstart', false ) ) {
				plugin_config_set( 'winstart', $f_winstart );
			}
		}
	}

	public function commit( $p_repo, $p_data ) {
		if ( preg_match( '/(\d+)/', $p_data, $p_matches ) ) {
			$svn = $this->svn_call( $p_repo );

			$t_url = $p_repo->url;
			$t_revision = $p_matches[1];
			$t_svnlog_xml = shell_exec( "$svn log -v $t_url -r$t_revision --xml" );

			if ( SourceChangeset::exists( $p_repo->id, $t_revision ) ) {
				echo "Revision $t_revision already committed!\n";
				return null;
			}

			return $this->process_svn_log_xml( $p_repo, $t_svnlog_xml );
		}
	}

	public function import_full( $p_repo ) {
		$this->svn_check();
		$svn = $this->svn_call( $p_repo );

		$t_changeset_table = plugin_table( 'changeset', 'Source' );

		$t_max_query = "SELECT revision FROM $t_changeset_table
						WHERE repo_id=" . db_param() . '
						ORDER BY CAST( revision AS DECIMAL ) DESC';
		$t_db_revision = db_result( db_query_bound( $t_max_query, array( $p_repo->id ), 1 ) );

		$t_url = $p_repo->url;
		$t_rev = ( false === $t_db_revision ? 0 : $t_db_revision + 1 );


		# finding max revision
		$t_svninfo_xml = shell_exec( "$svn info $t_url --xml" );
		try {
			# create parser
			$t_svninfo_parsed_xml = new SimpleXMLElement($t_svninfo_xml);
		}
		catch( Exception $e ) {
			# parsing error - no success here
			echo '<pre>svn info returned invalid xml code</pre>';
			return array();
		}
		$t_max_rev = (integer) $t_svninfo_parsed_xml->entry->commit['revision'];

		# this is required because invalid revision number render invalid xml output for svn log
		if($t_rev > $t_max_rev) {
			echo "<pre>Next lookup revision ($t_rev) exceeds head revision ($t_max_rev), skipping...</pre>";
			return array();
		}


		echo '<pre>';
		echo "Requesting svn log for {$p_repo->name} starting with revision {$t_rev}...\n";

		# get the svn log in xml format
		$t_svnlog_xml = shell_exec( "$svn log -v -r $t_rev:HEAD --limit 200 $t_url --xml" );

		# parse the changesets
		$t_changesets = $this->process_svn_log_xml( $p_repo, $t_svnlog_xml );

		echo "</pre>";
		return $t_changesets;
	}

	public function import_latest( $p_repo ) {
		return $this->import_full( $p_repo );
	}

	private function svn_check() {
		$svn = self::svn_call();

		if ( is_blank( shell_exec( "$svn help" ) ) ) {
			trigger_error( ERROR_GENERIC, ERROR );
		}
	}

	private function svn_call( $p_repo=null ) {
		static $s_call;

		# Get a full binary call, including configured parameters
		if ( is_null( $s_call ) ) {
			$s_call = self::svn_binary() . ' --non-interactive';

			if ( plugin_config_get( 'svnssl', false ) ) {
				$s_call .= ' --trust-server-cert';
			}

			$t_svnargs = plugin_config_get( 'svnargs', '' );
			if ( !is_blank( $t_svnargs ) ) {
				$s_call .= " $t_svnargs";
			}
		}

		# If not given a repo, just return the base SVN binary
		if ( is_null( $p_repo ) ) {
			return $s_call;
		}

		$t_call = $s_call;

		# With a repo, add arguments for repo info
		$t_username = escapeshellarg($p_repo->info['svn_username']);
		$t_password = escapeshellarg($p_repo->info['svn_password']);

		if ( !is_blank( $t_username ) ) {
			$t_call .= ' --username ' . $t_username;
		}
		if ( !is_blank( $t_password ) ) {
			$t_call .= ' --password ' . $t_password;
		}

		# Done
		return $t_call;
	}

	/**
	 * Generate, validate, and cache the SVN binary path.
	 * @param string Path to SVN
	 * @param boolean Reset cached value
	 * @return string SVN binary
	 */
	public static function svn_binary( $p_path=null, $p_reset=false ) {
		static $s_binary;

		if ( is_null( $s_binary ) || $p_reset ) {
			if ( is_null( $p_path ) ) {
				$t_path = plugin_config_get( 'svnpath', '' );
			} else {
				$t_path = $p_path;
			}

			if ( !is_blank( $t_path ) && is_dir( $t_path ) ) {

				# Linux / UNIX paths
				$t_binary = $t_path . DIRECTORY_SEPARATOR . 'svn';
				if ( is_file( $t_binary ) && is_executable( $t_binary ) ) {
					return $s_binary = $t_binary;
				}

				# Windows paths
				$t_binary = $t_path . DIRECTORY_SEPARATOR . 'svn.exe';
				if ( is_file( $t_binary ) && is_executable( $t_binary ) ) {
					if ( plugin_config_get( 'winstart', '' ) ) {
						return "start /B /D \"{$t_path}\" svn.exe";
					} else {
						return $s_binary = $t_binary;
					}
				}

			}

			# Generic pathless call
			$s_binary = 'svn';
		}

		return $s_binary;
	}


	/**
	 * Parse the svn log output (with --xml option)
	 * @param SourceRepo SVN repository object
	 * @param string SVN log (XML formated)
	 * @return SourceChangeset[] Changesets for the provided input (empty on error)
	 */
	private function process_svn_log_xml( $p_repo, $p_svnlog_xml ) {
		$t_changesets = array();
		$t_changeset = null;
		$t_comments = '';
		$t_count = 0;

		$t_trunk_path = $p_repo->info['trunk_path'];
		$t_branch_path = $p_repo->info['branch_path'];
		$t_tag_path = $p_repo->info['tag_path'];
		$t_ignore_paths = $p_repo->info['ignore_paths'];

		echo "Processing svn log (xml)...\n";
		# empty log?
		if( trim($p_svnlog_xml) === '' )
			return array();

		# parse XML
		try {
			$t_xml = new SimpleXMLElement($p_svnlog_xml);
		}
		catch( Exception $e ) {
			echo 'Parsing error of xml log...';
			return array();
		}

		# timezone for conversions in loca
		$t_utc = new DateTimeZone('UTC');
		$t_localtz = new DateTimeZone( date_default_timezone_get() );

		foreach( $t_xml->logentry as $t_entry ) {
			# time conversion to local time
			$t_date = new DateTime( $t_entry->date, $t_utc );
			$t_date->setTimeZone($t_localtz);

			# create the changeset
			$t_str_date = $t_date->format('Y-m-d H:i:s');
			$t_changeset = new SourceChangeset( $p_repo->id, (integer)$t_entry['revision'], '', $t_str_date, (string)$t_entry->author, '');

			# files
			if(isset($t_entry->paths->path)){
				foreach( $t_entry->paths->path as $t_path ) {
				switch( (string)$t_path['action'] ) {
					case 'A': $t_action = 'add'; break;
					case 'D': $t_action = 'rm'; break;
					case 'M': $t_action = 'mod'; break;
					case 'R': $t_action = 'mv'; break;
					default: $t_action = (string)$t_path['action'];
				}

				$t_file = new SourceFile( $t_changeset->id, '', (string)$t_path, $t_action );
				$t_changeset->files[] = $t_file;

				# Branch-checking
				if( is_blank( $t_changeset->branch ) ) {
					# Look for standard trunk/branches/tags information
					if( $p_repo->info['standard_repo'] ) {
						if( preg_match( '@/(?:(trunk)|(?:branches|tags)/([^/]+))@i', $t_file->filename, $t_matches ) ) {
							if( !is_blank( $t_matches[1] ) ) {
								$t_changeset->branch = $t_matches[1];
							} else {
								$t_changeset->branch = $t_matches[2];
							}
						}
					} else {
						# Look for non-standard trunk path
						if( !is_blank( $t_trunk_path ) && preg_match( '@^/*(' . $t_trunk_path . ')@i', $t_file->filename, $t_matches ) ) {
							$t_changeset->branch = $t_matches[1];

						# Look for non-standard branch path
						} else if( !is_blank( $t_branch_path ) && preg_match( '@^/*(?:' . $t_branch_path . ')/([^/]+)@i', $t_file->filename, $t_matches ) ) {
							$t_changeset->branch = $t_matches[1];

						# Look for non-standard tag path
						} else if( !is_blank( $t_tag_path ) && preg_match( '@^/*(?:' . $t_tag_path . ')/([^/]+)@i', $t_file->filename, $t_matches ) ) {
							$t_changeset->branch = $t_matches[1];

						# Fall back to just using the root folder as the branch name
						} else if( !$t_ignore_paths && preg_match( '@/([^/]+)@', $t_file->filename, $t_matches ) ) {
							$t_changeset->branch = $t_matches[1];
						}
					}
				} # end is_blank( $t_changeset->branch ) if
			} # end files in revision ($t_path) foreach
			} else { # no file paths set
                                $t_changeset->branch = $t_trunk_path;
                        }


			# get the log message
			$t_changeset->message = (string)$t_entry->msg;

			// Save changeset and append to array
			if( !is_null( $t_changeset) ) {
				if( !is_blank( $t_changeset->branch ) ) {
					$t_changeset->save();
					$t_changesets[] = $t_changeset;
				}
			}
		}

		if( !is_null( $t_changeset ) ) {
			echo "Parsed to revision {$t_changeset->revision}.\n";
		} else {
			echo "No revisions parsed.\n";
		}

		return $t_changesets;
	}
}