<?php

/*
 * Upgrader using git for file upgrade and mustal to update the database definition
 *
 * Copyright (c) 2022 OpenXE project
 *
 */

$upgrade_echo_out_file_name = "";

function upgrade_set_out_file_name(string $filename) {

    GLOBAL $upgrade_echo_out_file_name;

    $upgrade_echo_out_file_name = $filename;
}

function echo_out(string $text) {

    GLOBAL $upgrade_echo_out_file_name;

    if ($upgrade_echo_out_file_name == "") {
        echo($text);
    } else {
        file_put_contents($upgrade_echo_out_file_name,$text, FILE_APPEND);
    }  
}

function echo_output(array $output) {
    echo_out(implode("\n",$output)."\n");
}

function abort(string $message) {
    echo_out($message."\n");
    echo_out("--------------- Aborted! ---------------\n");
    echo_out("--------------- ".date("Y-m-d H:i:s")." ---------------\n");
}

function git(string $command, &$output, bool $show_command, bool $show_output, string $error_text) : int {
    $output = array();
    if ($show_command) {
        echo_out("git ".$command."\n");
    }
    exec("git ".$command,$output,$retval);
    if (!empty($output)) {
        if ($show_output || $retval != 0) {
            echo_output($output);
        }
    }
    return($retval);
}

// -------------------------------- START

// Check for correct call method
$directory = "";
if (php_sapi_name() == "cli") {
    $cli = true;
    $directory = ".";
} else if (basename(getcwd()) != 'upgrade') {
    // Started from "www"
    $directory = "../upgrade";
} else {
    abort("Must be executed from 'upgrade' directory.");
    return(-1);
}

if ($cli) {

    $check_git = false;
    $do_git = false;
    $check_db = false;
    $do_db = false;
    $do = false;

    if ($argc > 1) {        

        if (in_array('-v', $argv)) {
          $verbose = true;
        } else {
          $verbose = false;
        } 

        if (in_array('-e', $argv)) {
          $export_db = true;
        } else {
          $export_db = false;
        } 

        if (in_array('-f', $argv)) {
          $force = true;
        } else {
          $force = false;
        } 

        if (in_array('-s', $argv)) {
          $check_git = true;
        } else {
        } 

        if (in_array('-db', $argv)) {
          $check_db = true;
        } else {
        } 

        if (in_array('-do', $argv)) {
            if (!$check_git && !$check_db) {
                $do_git = true;
                $do_db = true;
            }
            if ($check_git) {
                $do_git = true;
            }
            if ($check_db) {
                $do_db = true;
            }
        }

        if ($check_git || $check_db || $do_git || $do_db) {
            upgrade_main($directory,$verbose,$check_git,$do_git,$export_db,$check_db,$do_db,$force);
        } else {
            info();
        }

    } else {
        info();
    }

} 
// -------------------------------- END

function upgrade_main(string $directory,bool $verbose, bool $check_git, bool $do_git, bool $export_db, bool $check_db, bool $do_db, bool $force) {  

    class DatabaseConnectionInfo {
        function __construct($dir) {
            require($dir."/../conf/user.inc.php");
        }
    }

    $dbci = new DatabaseConnectionInfo($directory);

    $host = $dbci->WFdbhost;
    $user = $dbci->WFdbuser;
    $passwd = $dbci->WFdbpass;
    $schema = $dbci->WFdbname;

    require_once($directory.'/../vendor/mustal/mustal_mysql_upgrade_tool.php');

    $datafolder = $directory."/data";
    $lockfile_name = $datafolder."/.in_progress.flag";
    $remote_file_name = $datafolder."/remote.json";
    $schema_file_name = "db_schema.json";

    echo_out("--------------- OpenXE upgrade ---------------\n");
    echo_out("--------------- ".date("Y-m-d H:i:s")." ---------------\n");

    //require_once($directory.'/../cronjobs/githash.php');

    $remote_info_contents = file_get_contents($remote_file_name);
    if (!$remote_info_contents) {
        abort("Unable to load $remote_file_name");
        return(-1);
    } 
    $remote_info = json_decode($remote_info_contents, true);

    $modified_files = false;

    if ($check_git || $do_git) {
        // Get changed files on system -> Should be empty
        $output = array();
        $retval = git("ls-files -m ..", $output,$verbose,false,"Git not initialized.");
        if (!empty($output)) {
            $modified_files = true;
            echo_out("There are modified files:\n");
            echo_output($output);
        }

        // Not a git repository -> Create it and then go ahead
        if ($retval == 128) { 
            echo_out("Setting up git...");
            $retval = git("init ..", $output,$verbose,$verbose,"Error while initializing git!");
            if ($retval != 0) {
                abort("");
                return(-1);
            }
            $retval = git("add ../.", $output,$verbose,$verbose,"Error while initializing git!");   
            if ($retval != 0) {
                abort("");
                return(-1);
            }
            $retval = git("fetch ".$remote_info['host']." ".$remote_info['branch'],$output,$verbose,$verbose,"Error while initializing git!");
            if ($retval != 0) {
                abort("");
                return(-1);
            }

            $retval = git("checkout FETCH_HEAD -f", $output,$verbose,$verbose,"Error while initializing git!");   
            if ($retval != 0) {
                abort("");
                return(-1);
            }
        } else if ($retval != 0) {
            abort("Error while executing git!");
            return(-1);
        }

        if ($verbose) {
            echo_out("--------------- Upgrade history ---------------\n");
            $retval = git("log --date=short-local --pretty=\"%cd (%h): %s\" HEAD --not HEAD~5",$output,$verbose,$verbose,"Error while showing history!");
            if ($retval != 0) {
                abort("");
                return(-1);
            }
        } else {
            echo_out("--------------- Current version ---------------\n");
            $retval = git("log -1 --date=short-local --pretty=\"%cd (%h): %s\" HEAD",$output,$verbose,true,"Error while showing history!");
            if ($retval != 0) {
                return(-1);
            }
        }

        if ($do_git) {     

            if ($modified_files && !$force) {
                abort("Clear modified files or use -f");
                return(-1);
            }
      
            echo_out("--------------- Pulling files... ---------------\n");

            if ($force) {
                $retval = git("reset --hard",$output,$verbose,$verbose,"Error while resetting modified files!");
                if ($retval != 0) {
                     abort("");
                    return(-1);
                }       
            } 

            $retval = git("pull ".$remote_info['host']." ".$remote_info['branch'],$output,$verbose,$verbose,"Error while pulling files!");
            if ($retval != 0) {
                 abort("");
                return(-1);
            }

            $retval = git("reset --hard",$output,$verbose,$verbose,"Error while applying files!");
            if ($retval != 0) {
                 abort("");
                return(-1);
            }       

            echo_out("--------------- Files upgrade completed ---------------\n");
            $retval = git("log -1 ",$output,$verbose,$verbose,"Error while checking files!");
            if ($retval != 0) {
                 abort("");
                return(-1);
            }
            echo_output($output);
        } // $do_git
        else { // Dry run
            echo_out("--------------- Dry run, use -do to upgrade ---------------\n");
            echo_out("--------------- Fetching files... ---------------\n");

            $retval = git("fetch ".$remote_info['host']." ".$remote_info['branch'],$output,$verbose,$verbose,"Error while fetching files!");
            if ($retval != 0) {
                abort("");
            }

            echo_out("--------------- Pending upgrades: ---------------\n");

            $retval = git("log --date=short-local --pretty=\"%cd (%h): %s\" FETCH_HEAD --not HEAD",$output,$verbose,true,"Error while fetching files!");
            if (empty($output)) {
                echo_out("No upgrades pending.\n");
            }
            if ($retval != 0) {
                abort("");
            }
        } // Dry run
    } // $check_git

    if ($check_db || $do_db || $export_db) {
        echo_out("--------------- Loading from database '$schema@$host'... ---------------\n");
        $db_def = mustal_load_tables_from_db($host, $schema, $user, $passwd, $mustal_replacers);

        if (empty($db_def)) {
            echo_out("Could not load from $schema@$host\n");
            exit;
        }

        if ($export_db) {
            $export_file_name = "exported_db_schema.json";
            if (mustal_save_tables_to_json($db_def, $datafolder, $export_file_name, true) == 0) {
                echo_out("Database exported to $datafolder/$export_file_name\n");
            }
            else {
                echo_out("Could not export database to $datafolder/$export_file_name\n");
            }
        }

        $compare_differences = array();

        echo_out("--------------- Loading from JSON... ---------------\n");
        $compare_def = mustal_load_tables_from_json($datafolder, $schema_file_name);

        if (empty($compare_def)) {
            abort("Could not load from JSON $schema_file_name\n");
            return(-1);
        }
        echo_out("Table count database ".count($db_def['tables'])." vs. JSON ".count($compare_def['tables'])."\n");
        echo_out("--------------- Comparing JSON '".$compare_def['database']."@".$compare_def['host']."' vs. database '$schema@$host' ---------------\n");    
        $compare_differences = mustal_compare_table_array($db_def,"in DB",$compare_def,"in JSON",false,true);
        if ($verbose) {
            foreach ($compare_differences as $compare_difference) {
                $comma = "";
                foreach ($compare_difference as $key => $value) {
                    echo_out($comma."$key => [$value]");
                    $comma = ", ";
                }
                echo_out("\n");
            }           
        }
        echo_out((empty($compare_differences)?0:count($compare_differences))." differences.\n");

        echo_out("--------------- Comparing database '$schema@$host' vs. JSON '".$compare_def['database']."@".$compare_def['host']."' ---------------\n");    
        $compare_differences = mustal_compare_table_array($compare_def,"in JSON",$db_def,"in DB",true,true);
        if ($verbose) {
            foreach ($compare_differences as $compare_difference) {
                $comma = "";
                foreach ($compare_difference as $key => $value) {
                    echo_out($comma."$key => [$value]");
                    $comma = ", ";
                }
                echo_out("\n");
            }           
        }
        echo_out((empty($compare_differences)?0:count($compare_differences))." differences.\n");

        echo_out("--------------- Calculating database upgrade for '$schema@$host'... ---------------\n");

        $upgrade_sql = array();
        $result =  mustal_calculate_db_upgrade($compare_def, $db_def, $upgrade_sql, $mustal_replacers);

        if (!empty($result)) {
            abort(count($result)." errors.\n");
            if ($verbose) {
                foreach($result as $error) {
                    echo_out("Code: ".$error[0]." '".$error[1]."'\n");
                }
            }
            return(-1);
        }

        if ($verbose) {
            foreach($upgrade_sql as $statement) {
                echo_out($statement."\n");
            }
        }

        echo_out(count($upgrade_sql)." upgrade statements\n");

        if ($do_db) {
            echo_out("--------------- Executing database upgrade for '$schema@$host' database... ---------------\n");            
             // First get the contents of the database table structure
            $mysqli = mysqli_connect($host, $user, $passwd, $schema);

            /* Check if the connection succeeded */
            if (!$mysqli) {
                echo ("Failed to connect!\n");
            } else  {

                $counter = 0;
                $error_counter = 0;
                $number_of_statements = count($upgrade_sql);

                foreach ($upgrade_sql as $sql) {

                    $counter++;
                    echo_out("\rUpgrade step $counter of $number_of_statements... ");

                    $query_result = mysqli_query($mysqli, $sql);
                    if (!$query_result) {        
                        $error = " not ok: ". mysqli_error($mysqli);            
                        echo_out($error);
                        echo_out("\n");
//                        file_put_contents("./errors.txt",date()." ".$error.$sql."\n",FILE_APPEND);
                        $error_counter++;
                    } else {
                        echo_out("ok.\r");
                    }

                }

                echo_out("\n");
                echo_out("$error_counter errors.\n");
                if ($error_counter > 0) {
//                    echo_out("See 'errors.txt'\n");
                }

                echo_out("--------------- Checking database upgrade for '$schema@$host'... ---------------\n");
                $db_def = mustal_load_tables_from_db($host, $schema, $user, $passwd, $mustal_replacers);

                echo_out("--------------- Comparing database '$schema@$host' vs. JSON '".$compare_def['database']."@".$compare_def['host']."' ---------------\n");
                $compare_differences = mustal_compare_table_array($compare_def,"in JSON",$db_def,"in DB",true,true);
                echo_out((empty($compare_differences)?0:count($compare_differences))." differences.\n");
            }
        } // $do_db
    } // $check_db

/*
    echo_out("--------------- Locking system ---------------\n");
    if (file_exists($lockfile_name)) {
        echo_out("System is already locked.\n");
    } else {
        file_put_contents($lockfile_name," ");
    }

    echo_out("--------------- Unlocking system ---------------\n");
    unlink($lockfile_name);
*/

    echo_out("--------------- Done! ---------------\n");
    echo_out("--------------- ".date("Y-m-d H:i:s")." ---------------\n");
    return(0);
}

function info() {
    echo_out("OpenXE upgrade tool\n");
    echo_out("Copyright 2022 (c) OpenXE project\n");
    echo_out("\n");
    echo_out("Upgrade files and database\n");
    echo_out("Options:\n");
    echo_out("\t-s: check/do system upgrades\n");
    echo_out("\t-db: check/do database upgrades\n");
    echo_out("\t-e: export database schema\n");
    echo_out("\t-do: execute all upgrades\n");
    echo_out("\t-v: verbose output\n");
    echo_out("\t-f: force override of existing files\n");
    echo_out("\t-clean: (not yet implemented) create the needed SQL to remove items from the database not in the JSON\n");
    echo_out("\n");
}