# irclogger_web
# Copyright (C) 2023 mrkubax10 <mrkubax10@onet.pl>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

package frontend_routes;

use lib ".";
use frontend_session;
use logger;

use Digest::SHA;

use feature qw(switch);
use strict;
use warnings;

sub verifyChannelAccess {
	my $aRequest = $_[0];
	my $aClient = $_[1];
	my $aConnection = $_[2];
	my $aChannelID = $_[3];

	if(!defined($aRequest->{"cookies"}{"session"}) || !frontend_session::isValidSession($aRequest->{"cookies"}{"session"})) {
		frontend::sendUnauthorized($aClient, "You need to log in to view this resource");
		return 0;
	}
	my $session = $frontend_session::sessions{$aRequest->{"cookies"}{"session"}};
	my $query = $aConnection->prepare(qq(select id, privileges from users where name=?;));
	$query->execute($session->{"username"});
	my @row = $query->fetchrow_array();
	my $userID = $row[0];
	my $privileges = $row[1];
	if($privileges>0) {
		return 1;
	}
	$query = $aConnection->prepare(qq(select user_id from accessors where channel_id=$aChannelID and user_id=$userID;));
	$query->execute($session->{"username"});
	@row = $query->fetchrow_array();
	if(scalar(@row)==0) {
		frontend::sendForbidden($aClient, "You don't have access to this channel logs");
		return 0;
	}
	return 1;
}

sub handlePath {
	my $aClient = $_[0];
	my $aPath = $_[1];
	my $aRequest = $_[2];
	my $aConnection = $_[3];

	given($aPath) {
	when("/") {
		my $userbar;
		my $logged = 0;
		if(defined($aRequest->{"cookies"}) && defined($aRequest->{"cookies"}{"session"})) {
			my $session = $aRequest->{"cookies"}{"session"};
			if(frontend_session::isValidSession($session) && defined($frontend_session::sessions{$session}{"username"}) && $frontend_session::sessions{$session}{"logged"}) {
				my $username = $frontend_session::sessions{$session}{"username"};
				$userbar = "<a href=\"panel\">$username</a> | ";
				$userbar.="<a href=\"logout_action\">Log out</a>";
				$logged = 1;
			}
		}
		if(!$logged) {
			$userbar = "<form action=\"login_action\" method=\"POST\">";
			$userbar.="<input name=\"username\" type=\"text\" placeholder=\"Username\" /> ";
			$userbar.="<input name=\"password\" type=\"password\" placeholder=\"Password\" /> ";
			$userbar.="<input name=\"login\" type=\"submit\" value=\"Login\" />";
			$userbar.="</form>";
		}

		my $query = $aConnection->prepare(qq(select channels.id, channels.name, servers.name from channels inner join servers on channels.server_id=servers.id where channels.public=1;));
		$query->execute();
		my $table = "";
		while(my @row = $query->fetchrow_array()) {
			my $channelID = $row[0];
			my $channelName = $row[1];
			my $serverName = $row[2];

			$table.="<tr><td><a href=\"view_logs?channel=$channelID\">$channelName</a></td><td>$serverName</td></tr>";
		}

		my $privateChannels = "";
		if($logged) {
			$query = $aConnection->prepare(qq(select id from users where name=?;));
			$query->execute($frontend_session::sessions{$aRequest->{"cookies"}{"session"}}{"username"});
			my @row = $query->fetchrow_array();
			my $id = $row[0];
			$query = $aConnection->prepare(qq(select channel_id from accessors where user_id=?;));
			$query->execute($id);
			while(@row = $query->fetchrow_array()) {
				my $channelID = $row[0];
				my $channelQuery = $aConnection->prepare(qq(select channels.name, servers.name from channels inner join servers on channels.server_id=servers.id where channels.id=$channelID;));
				$channelQuery->execute();
				@row = $channelQuery->fetchrow_array();
				my $channelName = $row[0];
				my $serverName = $row[1];
				$privateChannels.="<tr><td><a href=\"view_logs?channel=$channelID\">$channelName</a></td><td>$serverName</td></tr>";
			}
		}

		frontend::sendTemplate("templates/index.html", $aClient, {"userbar"=>$userbar, "publicChannels"=>$table, "privateChannels"=>$privateChannels});
		return 1;
	}
	when("/login_action") {
		if(defined($aRequest->{"cookies"}{"session"}) && frontend_session::isValidSession($aRequest->{"cookies"}{"session"})) {
			frontend::redirect($aClient, "/");
			return 1;
		}
		if(defined($aRequest->{"headers"}{"Content-Type"}) && $aRequest->{"headers"}{"Content-Type"} ne "application/x-www-form-urlencoded") {
			frontend::sendBadRequest($aClient, "Unsupported form Content-Type (application/x-www-form-urlencoded required)");
			return 1;
		}
		if(!defined($aRequest->{"content"})) {
			frontend::sendBadRequest($aClient, "Request content required");
			return 1;
		}

		my %parameters = frontend::parsePathParameters($aRequest->{"content"});
		if(!defined($parameters{"username"})) {
			frontend::sendBadRequest($aClient, "Username parameter required");
			return 1;
		}
		if(!defined($parameters{"password"})) {
			frontend::sendBadRequest($aClient, "Password parameter required");
			return 1;
		}

		my $username = $parameters{'username'};
		my $hashedPassword = Digest::SHA::sha256_hex($parameters{"password"});
		my $query = $aConnection->prepare(qq(select name, password from users where name=?;));
		$query->execute($username);
		my @row = $query->fetchrow_array();
		if(scalar(@row)==0) {
			frontend::sendBadRequest($aClient, "Unknown user $username");
			return 1;
		}
		if($row[1] ne $hashedPassword) {
			frontend::sendBadRequest($aClient, "Wrong password");
			return 1;
		}

		my $token = frontend_session::newSessionToken();
		$frontend_session::sessions{$token}{"username"} = $username;
		$frontend_session::sessions{$token}{"logged"} = 1;

		my $response = frontend::getBaseResponse(301, "OK");
		$response.="Location: /\r\n";
		$response.="Content-Length: 0\r\n";
		$response.="Set-Cookie: session=$token\r\n\r\n";
		$aClient->send($response);
		return 1;
	}
	when("/logout_action") {
		if(defined($aRequest->{"cookies"}{"session"})) {
			frontend_session::deleteSession($aRequest->{"cookies"}{"session"});
		}
		frontend::redirect($aClient, "/");
		return 1;
	}
	when("/panel") {
		if(!defined($aRequest->{"cookies"}{"session"}) || !frontend_session::isValidSession($aRequest->{"cookies"}{"session"})) {
			frontend::redirect($aClient, "/");
			return 1;
		}
		my $session = $frontend_session::sessions{$aRequest->{"cookies"}{"session"}};
		my $query = $aConnection->prepare(qq(select privileges from users where name=?;));
		$query->execute($session->{"username"});
		my @row = $query->fetchrow_array();
		my $privileges = $row[0];

		my $manageChannelAccess = "";
		if($privileges>=1) { # moderator
			$manageChannelAccess.="<h3>Manage channel access</h3>";
			$manageChannelAccess.="<form action=\"manage_access_action\" method=\"POST\">";
			$manageChannelAccess.="<select name=\"user\">";
			$query = $aConnection->prepare(qq(select id, name from users;));
			$query->execute();
			while(@row = $query->fetchrow_array()) {
				my $id = $row[0];
				my $name = $row[1];
				if($name eq $session->{"username"}) {
					next;
				}
				$manageChannelAccess.="<option value=\"$id\">$name</option>";
			}
			$manageChannelAccess.="</select>";
			$manageChannelAccess.="<select name=\"channel\">";
			$query = $aConnection->prepare(qq(select channels.id, channels.name, servers.name from channels inner join servers on channels.server_id=servers.id;));
			$query->execute();
			while(@row = $query->fetchrow_array()) {
				my $channelID = $row[0];
				my $channel = $row[1];
				my $server = $row[2];
				$manageChannelAccess.="<option value=\"$channelID\">$channel at $server</option>";
			}
			$manageChannelAccess.="</select><br />";
			$manageChannelAccess.="<input name=\"grant\" type=\"submit\" value=\"Grant access\" /> ";
			$manageChannelAccess.="<input name=\"revoke\" type=\"submit\" value=\"Revoke access\" />";
			$manageChannelAccess.="</form>";
		}

		my $manageServers = "";
		if($privileges==2) {
			$manageServers.="<h3>Manage servers</h3>";
			$manageServers.="<form action=\"manage_server_action\" method=\"POST\">";
			$manageServers.="<input name=\"name\" type=\"text\" placeholder=\"Server name\" /><br />";
			$manageServers.="<input name=\"address\" type=\"text\" placeholder=\"Server address\" /> ";
			$manageServers.="<input name=\"port\" type=\"number\" placeholder=\"Server port (optional)\" /><br />";
			$manageServers.="<input type=\"submit\" value=\"Add\" />";
			$manageServers.="</form>";
		}

		my $manageChannels = "";
		if($privileges==2) {
			$manageChannels.="<h3>Manage channels</h3>";
			$manageChannels.="<form action=\"manage_channel_action\" method=\"POST\">";
			$manageChannels.="<input name=\"channel\" type=\"text\" placeholder=\"Channel\" /> at ";
			$manageChannels.="<select name=\"server\">";
			$query = $aConnection->prepare(qq(select id, name from servers;));
			$query->execute();
			while(@row = $query->fetchrow_array()) {
				my $id = $row[0];
				my $name = $row[1];
				$manageChannels.="<option value=\"$id\">$name</option>";
			}
			$manageChannels.="</select><br />";
			$manageChannels.="<input type=\"submit\" value=\"Add\" />";
			$manageChannels.="</form>";
		}

		my $addUser = "";
		if($privileges==2) {
			$addUser.="<h3>Add user</h3>";
			$addUser.="<form action=\"add_user_action\" method=\"POST\">";
			$addUser.="<input name=\"name\" type=\"text\" placeholder=\"Username\" /><br />";
			$addUser.="<input name=\"password\" type=\"password\" placeholder=\"Password\" /><br />";
			$addUser.="<input name=\"confirmPassword\" type=\"password\" placeholder=\"Confirm password\" /><br />";
			$addUser.="<input type=\"submit\" value=\"Add\" />";
			$addUser.="</form>";
		}

		frontend::sendTemplate("templates/panel.html", $aClient, {"username"=>$session->{"username"}, "manageChannelAccess"=>$manageChannelAccess, "manageServers"=>$manageServers, "manageChannels"=>$manageChannels, "addUser"=>$addUser});
		return 1;
	}
	when("/change_password_action") {
		if(!defined($aRequest->{"cookies"}{"session"}) || !frontend_session::isValidSession($aRequest->{"cookies"}{"session"})) {
			frontend::redirect($aClient, "/");
			return 1;
		}
		if(defined($aRequest->{"headers"}{"Content-Type"}) && $aRequest->{"headers"}{"Content-Type"} ne "application/x-www-form-urlencoded") {
			frontend::sendBadRequest($aClient, "Unsupported form Content-Type (application/x-www-form-urlencoded required)");
			return 1;
		}
		if(!defined($aRequest->{"content"})) {
			frontend::sendBadRequest($aClient, "Request content required");
			return 1;
		}
		my $session = $frontend_session::sessions{$aRequest->{"cookies"}{"session"}};

		my %parameters = frontend::parsePathParameters($aRequest->{"content"});
		if(!defined($parameters{"currentPassword"})) {
			frontend::sendBadRequest($aClient, "Current password parameter required");
			return 1;
		}
		if(!defined($parameters{"newPassword"})) {
			frontend::sendBadRequest($aClient, "New password parameter required");
			return 1;
		}

		my $query = $aConnection->prepare(qq(select password from users where name=?;));
		$query->execute($session->{"username"});
		my @row = $query->fetchrow_array();
		my $password = $row[0];
		if($password ne Digest::SHA::sha256_hex($parameters{"currentPassword"})) {
			frontend::sendBadRequest($aClient, "Wrong password");
			return 1;
		}
		if($parameters{"newPassword"} eq $password) {
			frontend::sendBadRequest($aClient, "New password and current password match");
			return 1;
		}

		$query = $aConnection->prepare(qq(update users set password=? where name=?;));
		$query->execute(Digest::SHA::sha256_hex($parameters{"newPassword"}), $session->{"username"});
		frontend::redirect($aClient, "/password_changed.html");

		return 1;
	}
	when("/manage_server_action") {
		if(!defined($aRequest->{"cookies"}{"session"}) || !frontend_session::isValidSession($aRequest->{"cookies"}{"session"})) {
			frontend::redirect($aClient, "/");
			return 1;
		}
		if(defined($aRequest->{"headers"}{"Content-Type"}) && $aRequest->{"headers"}{"Content-Type"} ne "application/x-www-form-urlencoded") {
			frontend::sendBadRequest($aClient, "Unsupported form Content-Type (application/x-www-form-urlencoded required)");
			return 1;
		}
		if(!defined($aRequest->{"content"})) {
			frontend::sendBadRequest($aClient, "Request content required");
			return 1;
		}
		my $session = $frontend_session::sessions{$aRequest->{"cookies"}{"session"}};

		my $query = $aConnection->prepare(qq(select privileges from users where name=?;));
		$query->execute($session->{"username"});
		my @row = $query->fetchrow_array();
		if($row[0]<2) {
			frontend::sendForbidden($aClient, "Insufficient permissions to perform this operation");
			return 1;
		}

		my %parameters = frontend::parsePathParameters($aRequest->{"content"});
		if(!defined($parameters{"name"})) {
			frontend::sendBadRequest($aClient, "Server name required");
			return 1;
		}
		if(!defined($parameters{"address"})) {
			frontend::sendBadRequest($aClient, "Server address required");
			return 1;
		}
		my $port = 6667;
		if(defined($parameters{"port"}) && length($parameters{"port"})>0) {
			$port = $parameters{"port"};
		}

		$query = $aConnection->prepare(qq(select id from servers where name=?;));
		$query->execute($parameters{"name"});
		@row = $query->fetchrow_array();
		if(scalar(@row)>0) {
			frontend::sendConflict($aClient, "Server with name $parameters{'name'} already exists");
			return 1;
		}

		$query = $aConnection->prepare(qq(select id from servers order by rowid desc limit 1;));
		$query->execute();
		@row = $query->fetchrow_array();
		my $lastID = 0;
		if(scalar(@row)>0) {
			$lastID = $row[0]+1;
		}

		$query = $aConnection->prepare(qq(insert into servers values($lastID, ?, ?, ?);));
		$query->execute($parameters{"name"}, $parameters{"address"}, $port);
		frontend::redirect($aClient, "/server_added.html");
		logger::createLogger($parameters{"name"}, $parameters{"address"}, $port, ());
		return 1;
	}
	when("/view_logs") {
		my $channelID = $aRequest->{"path"}{"parameters"}{"channel"};
		if(!defined($channelID)) {
			frontend::sendBadRequest($aClient, "view_logs requires channel URL parameter");
			return 1;
		}

		my $query = $aConnection->prepare(qq(select channels.name, channels.public, servers.name from channels inner join servers on channels.server_id=servers.id where channels.id=?;));
		$query->execute($channelID);
		my @row = $query->fetchrow_array();
		if(scalar(@row)==0) {
			frontend::sendBadRequest($aClient, "Unknown channel with ID $channelID");
			return 1;
		}
		my $channelName = $row[0];
		$channelName =~ s/%23/#/;
		my $channelPublic = $row[1];
		if(!$channelPublic && !verifyChannelAccess($aRequest, $aClient, $aConnection, $channelID)) {
			return 1;
		}
		my $serverName = $row[2];
		my $logsPath = "logs/".$serverName."/".$channelName;

		my $result = opendir(my $folder, $logsPath);
		if(!$result) {
			frontend::sendBadRequest($aClient, "Channel $channelName on $serverName doesn't have any logs");
			return 1;
		}
		my @entries = grep(!/^\.\.?$/, readdir($folder));

		my $table = "";
		foreach my $entry (@entries) {
			$table.="<tr><td><a href=\"view_log?channel=$channelID&file=$entry\">$entry</a></td></tr>";
		}

		frontend::sendTemplate("templates/view_logs.html", $aClient, {"channel"=>$channelName, "server"=>$serverName, "logs"=>$table});
		return 1;
	}
	when("/view_log") {
		my $channelID = $aRequest->{"path"}{"parameters"}{"channel"};
		if(!defined($channelID)) {
			frontend::sendBadRequest($aClient, "view_log requires channel URL parameter");
			return 1;
		}
		my $logFile = $aRequest->{"path"}{"parameters"}{"file"};
		if(!defined($channelID)) {
			frontend::sendBadRequest($aClient, "view_log requires file URL parameter");
			return 1;
		}

		my $query = $aConnection->prepare(qq(select channels.name, channels.public, servers.name from channels inner join servers on channels.server_id=servers.id where channels.id=?;));
		$query->execute($channelID);
		my @row = $query->fetchrow_array();
		if(scalar(@row)==0) {
			frontend::sendBadRequest($aClient, "Unknown channel with ID $channelID");
			return 1;
		}
		my $channelName = $row[0];
		$channelName =~ s/%23/#/;
		my $channelPublic = $row[1];
		if(!$channelPublic && !verifyChannelAccess($aRequest, $aClient, $aConnection, $channelID)) {
			return 1;
		}
		my $serverName = $row[2];
		my $logFilePath = "logs/".$serverName."/".$channelName."/".$logFile;

		my $result = open(my $file, "<", $logFilePath);
		if(!$result) {
			frontend::sendBadRequest($aClient, "No log file $logFile for channel $channelName at $serverName");
			return 1;
		}
		my $content = frontend::readFullFile($file);
		close($file);

		my $response = frontend::getBaseResponse(200, "OK");
		$response.="Content-Type: text/plain;charset=utf-8\r\n";
		$response.="Content-Length: ".length($content)."\r\n\r\n";
		$response.=$content;
		$aClient->send($response);
	}
	}
	return 0;
}

1;