/*
Node-OpenDroneMap Node.js App and REST API to access OpenDroneMap.
Copyright (C) 2016 Node-OpenDroneMap Contributors

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
let fs = require('fs');
let path = require('path');
let assert = require('assert');
let spawn = require('child_process').spawn;
let config = require('../config.js');
let logger = require('./logger');


function makeRunner(command, args, requiredOptions = [], outputTestFile = null){
    return function(options, done, outputReceived){
        for (let requiredOption of requiredOptions){
            assert(options[requiredOption] !== undefined, `${requiredOption} must be defined`);
        }

        let commandArgs = args;
        if (typeof commandArgs === 'function') commandArgs = commandArgs(options);

        logger.info(`About to run: ${command} ${commandArgs.join(" ")}`);

        if (config.test){
            logger.info("Test mode is on, command will not execute");

            if (outputTestFile){
                fs.readFile(path.resolve(__dirname, outputTestFile), 'utf8', (err, text) => {
                    if (!err){
                        let lines = text.split("\n");
                        lines.forEach(line => outputReceived(line));
                        
                        done(null, 0, null);
                    }else{
                        logger.warn(`Error: ${err.message}`);
                        done(err);
                    }
                });
            }else{
                done(null, 0, null);
            }

            return;// Skip rest
        }

        // Launch
        let childProcess = spawn(command, commandArgs);

        childProcess
            .on('exit', (code, signal) => done(null, code, signal))
            .on('error', done);

        childProcess.stdout.on('data', chunk => outputReceived(chunk.toString()));
        childProcess.stderr.on('data', chunk => outputReceived(chunk.toString()));

        return childProcess;
    };
}

module.exports = {
    runPostProcessingScript: makeRunner(path.join(__dirname, "..", "scripts", "postprocess.sh"),
                     function(options){
                         return [options.projectFolderPath];
                     },
                     ["projectFolderPath"])
};