// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for details.

import * as fs from "fs";
import * as nls from "vscode-nls";
import { Packager } from "../common/packager";
import { IRunOptions } from "./launchArgs";
import { PackagerStatusIndicator, PackagerStatus } from "./packagerStatusIndicator";
import { SettingsHelper } from "./settingsHelper";
import { OutputChannelLogger } from "./log/OutputChannelLogger";
import { RNProjectObserver } from "./rnProjectObserver";

nls.config({
    messageFormat: nls.MessageFormat.bundle,
    bundleFormat: nls.BundleFormat.standalone,
})();
const localize = nls.loadMessageBundle();

export interface MobilePlatformDeps {
    projectObserver?: RNProjectObserver;
    packager?: Packager;
}

export enum TargetType {
    Device = "device",
    Simulator = "simulator",
}

export class GeneralPlatform {
    protected projectPath: string;
    protected platformName: string;
    protected packager: Packager;
    protected logger: OutputChannelLogger;
    protected projectObserver?: RNProjectObserver;

    protected static NO_PACKAGER_VERSION = "0.42.0";

    public runArguments: string[];

    constructor(protected runOptions: IRunOptions, platformDeps: MobilePlatformDeps = {}) {
        this.platformName = this.runOptions.platform;
        this.projectPath = this.runOptions.projectRoot;
        this.packager =
            platformDeps.packager ||
            new Packager(
                this.runOptions.workspaceRoot,
                this.projectPath,
                SettingsHelper.getPackagerPort(this.runOptions.workspaceRoot),
                new PackagerStatusIndicator(this.projectPath),
            );
        this.projectObserver = platformDeps.projectObserver;
        this.packager.setRunOptions(runOptions);
        this.logger = OutputChannelLogger.getChannel(
            localize("ReactNativeRunPlatform", "React Native: Run {0}", this.platformName),
            true,
        );
        this.logger.clear();
        this.runArguments = this.getRunArguments();
    }

    public dispose(): void {
        return;
    }

    public async runApp(): Promise<void> {
        this.logger.info(
            localize(
                "ConnectedToPackager",
                "Connected to packager. You can now open your app in the simulator.",
            ),
        );
    }

    public async enableJSDebuggingMode(): Promise<void> {
        this.logger.info(
            localize(
                "DebuggerReadyEnableRemoteDebuggingInApp",
                "Debugger ready. Enable remote debugging in app.",
            ),
        );
    }

    public async disableJSDebuggingMode(): Promise<void> {
        this.logger.info(
            localize(
                "DebuggerReadyDisableRemoteDebuggingInApp",
                "Debugger ready. Disable remote debugging in app.",
            ),
        );
    }

    public async beforeStartPackager(): Promise<void> {
        return;
    }

    public async startPackager(): Promise<void> {
        this.logger.info(
            localize("StartingReactNativePackager", "Starting React Native Packager."),
        );
        if (await this.packager.isRunning()) {
            if (this.packager.getPackagerStatus() !== PackagerStatus.PACKAGER_STARTED) {
                await this.packager.stop();
            }
            this.logger.info(
                localize(
                    "AttachingToRunningReactNativePackager",
                    "Attaching to running React Native packager",
                ),
            );
        }
        await this.packager.start();
    }

    public async prewarmBundleCache(): Promise<void> {
        // generalPlatform should do nothing here. Method should be overriden by children for specific behavior.
        return;
    }

    public static removeRunArgument(runArguments: any[], optName: string, binary: boolean): void {
        const optIdx = runArguments.indexOf(optName);
        if (optIdx > -1) {
            if (binary) {
                runArguments.splice(optIdx, 1);
            } else {
                runArguments.splice(optIdx, 2);
            }
        }
    }

    public static setRunArgument(
        runArguments: any[],
        optName: string,
        value: string | boolean,
    ): void {
        const isBinary = typeof value === "boolean";
        const optIdx = runArguments.indexOf(optName);
        if (optIdx > -1) {
            if (isBinary && !value) {
                GeneralPlatform.removeRunArgument(runArguments, optName, true);
            }
            if (!isBinary) {
                runArguments[optIdx + 1] = value;
            }
        } else {
            if (isBinary && value) {
                runArguments.push(optName);
            }
            if (!isBinary) {
                runArguments.push(optName);
                runArguments.push(value);
            }
        }
    }

    public static getOptFromRunArgs(
        runArguments: any[],
        optName: string,
        binary: boolean = false,
    ): any {
        if (runArguments.length > 0) {
            const optIdx = runArguments.indexOf(optName);
            let result: any;

            if (optIdx > -1) {
                result = binary ? true : runArguments[optIdx + 1];
            } else {
                for (const arg of runArguments) {
                    if (arg.includes(optName)) {
                        if (binary) {
                            result = true;
                        } else {
                            const tokens = arg.split("=");
                            result = tokens.length > 1 ? tokens[1].trim() : undefined;
                        }
                    }
                }
            }

            // Binary parameters can either exists (e.g. be true) or be absent. You can not pass false binary parameter.
            if (binary) {
                return result === undefined ? undefined : true;
            }

            if (result) {
                try {
                    return JSON.parse(result);
                } catch (err) {
                    // simple string value, return as is
                    return result;
                }
            }
        }

        return undefined;
    }

    public getRunArguments(): string[] {
        throw new Error("Not yet implemented: GeneralPlatform.getRunArguments");
    }

    public static getEnvArgument(processEnv: any, env?: any, envFile?: string): any {
        const modifyEnv = Object.assign({}, processEnv);

        if (envFile) {
            // .env variables never overwrite existing variables
            const argsFromEnvFile = this.readEnvFile(envFile);
            if (argsFromEnvFile != null) {
                // eslint-disable-next-line no-restricted-syntax
                for (const key in argsFromEnvFile) {
                    if (!modifyEnv[key] && argsFromEnvFile.hasOwnProperty(key)) {
                        modifyEnv[key] = argsFromEnvFile[key];
                    }
                }
            }
        }

        if (env) {
            // launch config env vars overwrite .env vars
            // eslint-disable-next-line no-restricted-syntax
            for (const key in env) {
                if (env.hasOwnProperty(key)) {
                    modifyEnv[key] = env[key];
                }
            }
        }
        return modifyEnv;
    }

    private static readEnvFile(filePath: string): any {
        if (fs.existsSync(filePath)) {
            let buffer = fs.readFileSync(filePath, "utf8");
            const result = {};

            // Strip BOM
            if (buffer && buffer[0] === "\uFEFF") {
                buffer = buffer.substr(1);
            }

            buffer.split("\n").forEach((line: string) => {
                const r = line.match(/^\s*([\w.\-]+)\s*=\s*(.*)?\s*$/);
                if (r !== null) {
                    const key = r[1];
                    let value = r[2] || "";
                    if (
                        value.length > 0 &&
                        value.charAt(0) === '"' &&
                        value.charAt(value.length - 1) === '"'
                    ) {
                        value = value.replace(/\\n/gm, "\n");
                    }
                    result[key] = value.replace(/(^["']|["']$)/g, "");
                }
            });

            return result;
        }
        return null;
    }
}
