const fs = require('fs');
const _ = require('lodash');
const git = require('../../git');
const process = require('process');
const path = require('path');

const utils = require('corifeus-utils')

const replaces = {
    header: {
        prefix: '[//]: #@corifeus-header',
        postfix: '[//]: #@corifeus-header:end',
    },
    footer: {
        prefix: '[//]: #@corifeus-footer',
        postfix: '[//]: #@corifeus-footer:end',
    }
}

module.exports = (grunt, inConfig, done) => {

    const config = Object.assign({}, inConfig);

    ['header', 'footer'].forEach((type) => {
        if (config.hasOwnProperty(type) && config[type]) {
            ['prefix', 'postfix'].forEach((fix) => {
                if (!config.hasOwnProperty(fix)) {
                    config[fix] = replaces[type][fix];
                }
            })
        } else {
            config[type] = false;
        }
    })

//    console.log(config);

    const files = grunt.file.expand(config.files);
//    console.log(files);
    const gitData = {
        branch: undefined,
        date: undefined,
        commit: undefined,
        repo: undefined
    };

    Promise.all([
        git.branch,
        git.date,
        git.commit,
        git.repo
    ])
    .then( (result) => {
        gitData.branch = result[0];
        gitData.date = result[1];
        gitData.commit = result[2];
        gitData.repo = result[3];

        config.replace = _.template(config.replace)({
            git: gitData,
            pkg: require(`${process.cwd()}/package.json`)
        });

        files
            .map( (file) => fs.readFileSync(file).toString() )
            .forEach((data, index) => {
                data = utils.string.inject(data, config);

                grunt.log.writeln(`Replaced: ${files[index]}, Pre: ${config.prefix.replace('[//]:', '')}, Post: ${config.postfix.replace('[//]:', '')}`);
                fs.writeFileSync(files[index], data);
            })
        done();
    })
    .catch( (error)  => done(error) );

};