const fs = require('fs');
const os = require('os');
const path = require('path');
const exec = require('./exec');
const {StringWritable} = require('./tail');
const System = require('./system');
const Command = require('../run/command');
const through = require('through2');
const Sdk = require('./sdk');
const Env = require('./env');


class Android extends Sdk {

    constructor(version, ndkVersion) {
        super(Android.ID, version || Android.VERSION);
        this.ndk_version = ndkVersion || Android.NDK_VERSION;
        this.repository = 'https://dl.google.com/android/repository';
    }

    get prepared() {
        try {
            return fs.existsSync(this.sdkmanager_bin);
        } catch (e) {
            return false;
        }
    }

    get link() {
        return `${this.repository}/commandlinetools-${System.os}-${this.version}_latest.zip`;
    }

    get android_home() {
        return this.path;
    }

    get ndk_home() {
        return path.join(this.path, 'ndk-bundle')
    }

    get sdkmanager_bin() {
        return path.join(this.path, 'cmdline-tools/bin/sdkmanager');
    }

    prepare() {
        const result = [];
        result.push(super.prepare(0));
        if (!fs.existsSync(path.join(this.ndk_home))) {
            result.push(this.prepare_ndk());
        }
        return Promise.all(result);
    }

    prepare_ndk() {
        // ToDo: support windows
        const url = `${this.repository}/android-ndk-${this.ndk_version}-${System.os}-x86_64.zip`;
        this.log.d('download: *%s*', url);
        return Sdk.Downloader.download(url, this.ndk_home, 1, true);
    }

    sdkmanager(packages) {
        this.log.i('sdkmanager: *%s*', packages.join(', '));
        const installedFile = path.join(this.path, '.installed');
        const installed = new Set(
            fs.existsSync(installedFile) ?
                fs.readFileSync(installedFile, {encoding: 'utf8'}).split('\n') :
                []
        );
        const install = new Set(packages);
        for (const key of installed) {
            if (install.has(key)) {
                install.delete(key);
            }
        }
        if (install.size === 0) {
            return Promise.resolve();
        }
        const sdkmanagerBin = this.sdkmanager_bin;
        if (fs.existsSync(sdkmanagerBin)) {
            fs.chmodSync(sdkmanagerBin, 0o755);
        }
        const yes = '(while sleep 3; do echo "y"; done)';
        const command = [yes, '|', sdkmanagerBin]
            .concat(Array.from(install).map(name => `"${name}"`))
            .concat([`--sdk_root="${this.path}"`])
            .join(' ');
        return exec('.', command).then(() => {
            for (const key of install) {
                installed.add(key);
            }
            fs.writeFileSync(installedFile, Array.from(installed).join('\n'), {encoding: 'utf8'});
        });
    }

    activate() {
        Env.set('ANDROID_HOME', this.android_home);
        Env.set('ANDROID_NDK_HOME', this.ndk_home);
        Env.set('NDK_HOME', this.ndk_home);
    }

    get adbBin() {
        return path.join(this.path, 'platform-tools/adb');
    }

    adb(args) {
        return exec('.', [this.adbBin].concat(args).join(' ')).then(data => {
            for (let line of data.stderr.split('\n')) {
                if (line.indexOf('Error') > -1) {
                    throw line;
                }
            }
            return data;
        });
    }

    buildTool(name) {
        let buildToolsVersion = null;
        fs.readdirSync(path.join(this.path, 'build-tools')).forEach(file => {
            buildToolsVersion = file;
        });
        return path.join(this.path, 'build-tools', buildToolsVersion, name);
    }

    aapt(args) {
        const aaptBin = this.buildTool('aapt');
        return exec('.', [aaptBin].concat(args).join(' '));
    }

    apk() {
        const self = this;
        return through.obj(function(file, enc, callback) {
            self.aapt(['l', '-a', file.path]).then(data => {
                let activity = false;
                for (let line of data.stdout.split('\n')) {
                    if (line.indexOf('package') > -1) {
                        const value = /"(.*?)"/.exec(line);
                        if (value) file.package = value[1]
                    }
                    if (line.indexOf('activity') > -1) {
                        activity = true;
                    }
                    if (activity && line.indexOf('name') > -1) {
                        const value = /"(.*?)"/.exec(line);
                        if (value) {
                            file.activity = value[1];
                            activity = false;
                        }
                    }
                }
                this.push(file);
                callback();
            });
        });
    }

    _installApk(filename, pack) {
        this.log.i('install *%s*', filename);
        return this.adb(['install', '-r', '-d', filename])
            .then(() => {
                return false;
            })
            .catch(error => {
                if (error.includes('INSTALL_FAILED_UPDATE_INCOMPATIBLE')) {
                    this.log.w('!INSTALL FAILED UPDATE INCOMPATIBLE!');
                    return true;
                } else {
                    throw error;
                }
            })
            .then(reinstall => {
                if (reinstall) {
                    this.log.i('uninstall *%s*', pack);
                    return this.adb(['uninstall', pack]).then(() => {
                        this.log.i('install *%s*', filename);
                        return this.adb(['install', '-r', '-d', filename]);
                    });
                }
            });
    }

    install() {
        const self = this;
        return through.obj(function(file, enc, callback) {
            self._installApk(file.path, file.package).then(() => {
                // ToDo: kludge: delay before start
                setTimeout(() => {
                    this.push(file);
                    callback();
                }, 500);
            });
        });
    }

    start() {
        const self = this;
        return through.obj(function(file, enc, callback) {
            const name = `${file.package}/${file.activity}`;
            self.log.i('start *%s*', name);
            self.adb(['shell', 'am', 'start', '-n', name]).then(() => {
                setTimeout(() => {
                    self.adb(['shell', `"ps | grep ${file.package}"`]).then(result => {
                        file.pid = result.stdout.split(/\s+/)[1];
                        this.push(file);
                        callback();
                    });
                }, 1000);
            });
        });
    }

    logcat() {
        const self = this;
        return through.obj(function(file, enc, callback) {
            const cmd = `${self.adbBin} logcat --pid ${file.pid}`;
            const command = new Command(cmd).exec();
            this.push(command);
            command.contents.pipe(new StringWritable(line => {
                if (line.includes('SDL') && (line.includes('onDestroy()') || line.includes('onStop()'))) {
                    callback();
                    throw 'Exit';  // ToDo:
                }
            }));
        });
    }

    sign(keystore, keypass) {
        const self = this;
        return through.obj(function(file, enc, callback) {
            self.log.i('sign *%s*', file.path);
            const filename = path.join(os.tmpdir(), 'tmp.apk');
            fs.writeFileSync(filename, file.contents);
            const cmd = [
                self.buildTool('apksigner'),
                'sign',
                '--ks', keystore,
                '--ks-pass', `pass:${keypass}`,
                filename
            ].join(' ');
            exec('.', cmd).then(() => {
                file.contents = fs.readFileSync(filename);
                this.push(file);
                callback();
            });
        });
    }
}

Android.ID = 'android';

Android.VERSION_7302050 = '7302050';
Android.VERSION = Android.VERSION_7302050;

Android.NDK_VERSION_R15C = 'r15c';
Android.NDK_VERSION = Android.NDK_VERSION_R15C;

module.exports = Android;