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

import * as vscode from "vscode";
import * as path from "path";
import * as mkdirp from "mkdirp";
import { logger } from "vscode-debugadapter";
import { DebugProtocol } from "vscode-debugprotocol";
import { ProjectVersionHelper } from "../common/projectVersionHelper";
import { TelemetryHelper } from "../common/telemetryHelper";
import { MultipleLifetimesAppWorker } from "./appWorker";
import { RnCDPMessageHandler } from "../cdp-proxy/CDPMessageHandlers/rnCDPMessageHandler";
import { DebugSessionBase, DebugSessionStatus, IAttachRequestArgs, ILaunchRequestArgs } from "./debugSessionBase";
import { JsDebugConfigAdapter } from "./jsDebugConfigAdapter";
import { ErrorHelper } from "../common/error/errorHelper";
import { InternalErrorCode } from "../common/error/internalErrorCode";
import * as nls from "vscode-nls";
nls.config({ messageFormat: nls.MessageFormat.bundle, bundleFormat: nls.BundleFormat.standalone })();
const localize = nls.loadMessageBundle();

export class RNDebugSession extends DebugSessionBase {

    private readonly terminateCommand: string;

    private appWorker: MultipleLifetimesAppWorker | null;
    private nodeSession: vscode.DebugSession | null;
    private onDidStartDebugSessionHandler: vscode.Disposable;
    private onDidTerminateDebugSessionHandler: vscode.Disposable;

    constructor(session: vscode.DebugSession) {
        super(session);

        // constants definition
        this.terminateCommand = "terminate"; // the "terminate" command is sent from the client to the debug adapter in order to give the debuggee a chance for terminating itself

        // variables definition
        this.appWorker = null;

        this.onDidStartDebugSessionHandler = vscode.debug.onDidStartDebugSession(
            this.handleStartDebugSession.bind(this)
        );

        this.onDidTerminateDebugSessionHandler = vscode.debug.onDidTerminateDebugSession(
            this.handleTerminateDebugSession.bind(this)
        );
    }

    protected async launchRequest(response: DebugProtocol.LaunchResponse, launchArgs: ILaunchRequestArgs, request?: DebugProtocol.Request): Promise<void> {
        return new Promise<void>((resolve, reject) => this.initializeSettings(launchArgs)
            .then(() => {
                logger.log("Launching the application");
                logger.verbose(`Launching the application: ${JSON.stringify(launchArgs, null , 2)}`);

                this.appLauncher.launch(launchArgs)
                    .then(() => {
                        if (launchArgs.enableDebug) {
                            launchArgs.port = launchArgs.port || this.appLauncher.getPackagerPort(launchArgs.cwd);
                            this.attachRequest(response, launchArgs).then(() => {
                                resolve();
                            }).catch((e) => reject(e));
                        } else {
                            this.sendResponse(response);
                            resolve();
                        }
                    })
                    .catch((err) => {
                        reject(ErrorHelper.getInternalError(InternalErrorCode.ApplicationLaunchFailed, err.message || err));
                    });
            })
            .catch((err) => {
                reject(ErrorHelper.getInternalError(InternalErrorCode.ApplicationLaunchFailed, err.message || err));
            })
        )
        .catch(err => this.showError(err, response));
    }

    protected async attachRequest(response: DebugProtocol.AttachResponse, attachArgs: IAttachRequestArgs, request?: DebugProtocol.Request): Promise<void>  {
        let extProps = {
            platform: {
                value: attachArgs.platform,
                isPii: false,
            },
        };

        this.previousAttachArgs = attachArgs;
        return new Promise<void>((resolve, reject) => this.initializeSettings(attachArgs)
            .then(() => {
                logger.log("Attaching to the application");
                logger.verbose(`Attaching to the application: ${JSON.stringify(attachArgs, null , 2)}`);
                return ProjectVersionHelper.getReactNativeVersions(attachArgs.cwd, true);
            })
            .then(versions => {
                extProps = TelemetryHelper.addPropertyToTelemetryProperties(versions.reactNativeVersion, "reactNativeVersion", extProps);
                if (!ProjectVersionHelper.isVersionError(versions.reactNativeWindowsVersion)) {
                    extProps = TelemetryHelper.addPropertyToTelemetryProperties(versions.reactNativeWindowsVersion, "reactNativeWindowsVersion", extProps);
                }
                return TelemetryHelper.generate("attach", extProps, (generator) => {
                    attachArgs.port = attachArgs.port || this.appLauncher.getPackagerPort(attachArgs.cwd);
                    return this.appLauncher.getRnCdpProxy().stopServer()
                        .then(() => this.appLauncher.getRnCdpProxy().initializeServer(new RnCDPMessageHandler(), this.cdpProxyLogLevel))
                        .then(() => this.appLauncher.getPackager().start())
                        .then(() => {
                            logger.log(localize("StartingDebuggerAppWorker", "Starting debugger app worker."));

                            const sourcesStoragePath = path.join(this.projectRootPath, ".vscode", ".react");
                            // Create folder if not exist to avoid problems if
                            // RN project root is not a ${workspaceFolder}
                            mkdirp.sync(sourcesStoragePath);

                            // If launch is invoked first time, appWorker is undefined, so create it here
                            this.appWorker = new MultipleLifetimesAppWorker(
                                attachArgs,
                                sourcesStoragePath,
                                this.projectRootPath,
                                undefined
                                );
                            this.appLauncher.setAppWorker(this.appWorker);

                            this.appWorker.on("connected", (port: number) => {
                                if (this.cancellationTokenSource.token.isCancellationRequested) {
                                    return this.appWorker?.stop();
                                }

                                logger.log(localize("DebuggerWorkerLoadedRuntimeOnPort", "Debugger worker loaded runtime on port {0}", port));

                                this.appLauncher.getRnCdpProxy().setApplicationTargetPort(port);

                                if (this.debugSessionStatus === DebugSessionStatus.ConnectionPending) {
                                    return;
                                }

                                if (this.debugSessionStatus === DebugSessionStatus.FirstConnection) {
                                    this.debugSessionStatus = DebugSessionStatus.FirstConnectionPending;
                                    this.establishDebugSession(attachArgs, resolve);
                                } else if (this.debugSessionStatus === DebugSessionStatus.ConnectionAllowed) {
                                    if (this.nodeSession) {
                                        this.debugSessionStatus = DebugSessionStatus.ConnectionPending;
                                        this.nodeSession.customRequest(this.terminateCommand);
                                    }
                                }
                            });
                            if (this.cancellationTokenSource.token.isCancellationRequested) {
                                return this.appWorker.stop();
                            }
                            return this.appWorker.start();
                        });
                });
            })
            .catch((err) => {
                reject(ErrorHelper.getInternalError(InternalErrorCode.CouldNotAttachToDebugger, err.message || err));
            })
        )
        .catch(err => this.showError(err, response));
    }

    protected async disconnectRequest(response: DebugProtocol.DisconnectResponse, args: DebugProtocol.DisconnectArguments, request?: DebugProtocol.Request): Promise<void> {
        // The client is about to disconnect so first we need to stop app worker
        if (this.appWorker) {
            this.appWorker.stop();
        }

        this.onDidStartDebugSessionHandler.dispose();
        this.onDidTerminateDebugSessionHandler.dispose();

        super.disconnectRequest(response, args, request);
    }

    protected establishDebugSession(attachArgs: IAttachRequestArgs, resolve?: (value?: void | PromiseLike<void> | undefined) => void): void {
        const attachConfiguration = JsDebugConfigAdapter.createDebuggingConfigForPureRN(
            attachArgs,
            this.appLauncher.getCdpProxyPort(),
            this.session.id
        );

        vscode.debug.startDebugging(
            this.appLauncher.getWorkspaceFolder(),
            attachConfiguration,
            {
                parentSession: this.session,
                consoleMode: vscode.DebugConsoleMode.MergeWithParent,
            }
        )
        .then((childDebugSessionStarted: boolean) => {
            if (childDebugSessionStarted) {
                this.debugSessionStatus = DebugSessionStatus.ConnectionDone;
                this.setConnectionAllowedIfPossible();
                if (resolve) {
                    this.debugSessionStatus = DebugSessionStatus.ConnectionAllowed;
                    resolve();
                }
            } else {
                this.debugSessionStatus = DebugSessionStatus.ConnectionFailed;
                this.setConnectionAllowedIfPossible();
                this.resetFirstConnectionStatus();
                throw new Error("Cannot start child debug session");
            }
        },
        err => {
            this.debugSessionStatus = DebugSessionStatus.ConnectionFailed;
            this.setConnectionAllowedIfPossible();
            this.resetFirstConnectionStatus();
            throw err;
        });
    }

    private handleStartDebugSession(debugSession: vscode.DebugSession) {
        if (
            debugSession.configuration.rnDebugSessionId === this.session.id
            && debugSession.type === this.pwaNodeSessionName
        ) {
            this.nodeSession = debugSession;
        }
    }

    private handleTerminateDebugSession(debugSession: vscode.DebugSession) {
        if (
            debugSession.configuration.rnDebugSessionId === this.session.id
            && debugSession.type === this.pwaNodeSessionName
        ) {
            if (this.debugSessionStatus === DebugSessionStatus.ConnectionPending) {
                this.establishDebugSession(this.previousAttachArgs);
            } else {
                vscode.commands.executeCommand(this.stopCommand, this.session);
            }
        }
    }

    private setConnectionAllowedIfPossible(): void {
        if (
            this.debugSessionStatus === DebugSessionStatus.ConnectionDone
            || this.debugSessionStatus === DebugSessionStatus.ConnectionFailed
        ) {
            this.debugSessionStatus = DebugSessionStatus.ConnectionAllowed;
        }
    }

    private resetFirstConnectionStatus(): void {
        if (this.debugSessionStatus === DebugSessionStatus.FirstConnectionPending) {
            this.debugSessionStatus = DebugSessionStatus.FirstConnection;
        }
    }
}
