const { parseString } = require('xml2js');
const path = require('path');
const fs = require('fs');
const assert = require('assert');



console.log('Loading configuration: settings.json')
const settings = JSON.parse(
    fs.readFileSync(path.join(__dirname, 'settings.json'))
);
assert(typeof settings?.scriptConfig?.general?.command ==='string','Expected command')
assert(Array.isArray(settings?.scriptConfig?.env),'Expected an array of environment statuses')
assert(typeof settings?.fileName==='string', 'Expected a filename');
assert(typeof settings?.serviceScript==='string','Expected a result filename')


console.log('Loaded configuration');
//console.log(settings)
//console.log(process.argv)
fs.readFile(settings.fileName, (err, data) => {
    if (err) {
        throw new Error(
            `${err.code}: Could not read file. Try again. ${err.name}`
        );
    }
    console.log(`Reading ${settings.fileName}`);
    parseString(data, (err, res) => {
        if (err) {
            throw new Error(`${err.code}: Error parsing file. :${err.name}`);
        }

        console.log(`Parsing ${settings.fileName}`);
        assert(
            typeof res?.flashing?.header?.[0]?.phone_model[0]?.$?.model ===
                'string',
            'Expected a model number'
        );
        console.log('Model: ', res.flashing.header[0].phone_model[0].$.model);

        assert(
            Array.isArray(res?.flashing?.steps),
            'Expected steps to be an array!'
        );
        // Store steps
        const steps = res.flashing.steps[0];
        //console.log(steps.$.interface)
        assert(steps?.$?.interface === 'AP', 'Expected an Interface of AP');
        // if (steps.$.interface !== "AP") {
        //     throw new Error("Does not look like servicefile.xml. Aborting.");
        // }
        //settings.scriptConfig.env[settings.defaultMode].preconfig + '\n'
        //sScript+= `${settings.scriptConfig.env[settings.defaultMode].commentPre} Generated for ${res.flashing.header[0].phone_model[0].$.model} \n`
        const sScript = steps.step.reduce((t, e) => {
            switch (e.$.operation) {
                case 'oem':
                case 'getvar':
                    t +=
                        `${settings.scriptConfig.general.command} ${e.$.operation} ${e.$.var}` +
                        '\n';
                    break;
                case 'flash':
                    t +=
                        `${settings.scriptConfig.general.command} ${e.$.operation} ${e.$.partition} ${e.$.filename}` +
                        '\n';
                    break;
                case 'erase':
                    t +=
                        `${settings.scriptConfig.general.command} ${e.$.operation} ${e.$.partition}` +
                        '\n';
                    break;
                default:
                    throw new Error(`Unkown: ${e.$.operation}`);
            }
            return t;
        });

        //Write the data down
        settings.scriptConfig.env.forEach((e) => {
            const data =
                e.preConfig +
                '\n' +
                `${e.commentPre} Generated for ${res.flashing.header[0].phone_model[0].$.model}` +
                '\n' +
                sScript;
            fs.writeFile(
                settings.serviceScript + e.extension,
                data,
                { mode: 0o765 },
                (err) => {
                    if (err) {
                        throw new Error(
                            `${err.errno}: Error Writing Script: ${err.name}`
                        );
                    }
                    console.log(
                        `Done: ${settings.serviceScript + e.extension}`
                    );
                }
            );
        });
        //console.log(sScript)
    });
});