// cspell: ignore libusb

import { PromiseResolver } from '@yume-chan/async';
import { AbortController, DecodeUtf8Stream, GatherStringStream, WritableStream, type ReadableWritablePair } from '@yume-chan/stream-extra';

import { AdbAuthenticationProcessor, ADB_DEFAULT_AUTHENTICATORS, type AdbCredentialStore } from './auth.js';
import { AdbPower, AdbReverseCommand, AdbSubprocess, AdbSync, AdbTcpIpCommand, escapeArg, framebuffer, install, type AdbFrameBuffer } from './commands/index.js';
import { AdbFeatures } from './features.js';
import { AdbCommand, calculateChecksum, type AdbPacketData, type AdbPacketInit } from './packet.js';
import { AdbIncomingSocketHandler, AdbPacketDispatcher, type AdbSocket, type Closeable } from './socket/index.js';
import { decodeUtf8, encodeUtf8 } from './utils/index.js';

export enum AdbPropKey {
    Product = 'ro.product.name',
    Model = 'ro.product.model',
    Device = 'ro.product.device',
    Features = 'features',
}

export const VERSION_OMIT_CHECKSUM = 0x01000001;

export class Adb implements Closeable {
    /**
     * It's possible to call `authenticate` multiple times on a single connection,
     * every time the device receives a `CNXN` packet, it resets its internal state,
     * and starts a new authentication process.
     */
    public static async authenticate(
        connection: ReadableWritablePair<AdbPacketData, AdbPacketInit>,
        credentialStore: AdbCredentialStore,
        authenticators = ADB_DEFAULT_AUTHENTICATORS,
    ): Promise<Adb> {
        // Initially, set to highest-supported version and payload size.
        let version = 0x01000001;
        let maxPayloadSize = 0x100000;

        const resolver = new PromiseResolver<string>();
        const authProcessor = new AdbAuthenticationProcessor(authenticators, credentialStore);

        // Here is similar to `AdbPacketDispatcher`,
        // But the received packet types and send packet processing are different.
        const abortController = new AbortController();
        const pipe = connection.readable
            .pipeTo(new WritableStream({
                async write(packet) {
                    switch (packet.command) {
                        case AdbCommand.Connect:
                            version = Math.min(version, packet.arg0);
                            maxPayloadSize = Math.min(maxPayloadSize, packet.arg1);
                            resolver.resolve(decodeUtf8(packet.payload));
                            break;
                        case AdbCommand.Auth:
                            const response = await authProcessor.process(packet);
                            await sendPacket(response);
                            break;
                        default:
                            // Maybe the previous ADB client exited without reading all packets,
                            // so they are still waiting in OS internal buffer.
                            // Just ignore them.
                            // Because a `Connect` packet will reset the device,
                            // Eventually there will be `Connect` and `Auth` response packets.
                            break;
                    }
                }
            }), {
                // Don't cancel the source ReadableStream on AbortSignal abort.
                preventCancel: true,
                signal: abortController.signal,
            })
            .catch((e) => {
                resolver.reject(e);
            });

        const writer = connection.writable.getWriter();
        async function sendPacket(init: AdbPacketData) {
            // Always send checksum in auth steps
            // Because we don't know if the device needs it or not.
            await writer.write(calculateChecksum(init));
        }

        let banner: string;
        try {
            // https://android.googlesource.com/platform/packages/modules/adb/+/79010dc6d5ca7490c493df800d4421730f5466ca/transport.cpp#1252
            // There are some other feature constants, but some of them are only used by ADB server, not devices (daemons).
            const features = [
                AdbFeatures.ShellV2,
                AdbFeatures.Cmd,
                AdbFeatures.StatV2,
                AdbFeatures.ListV2,
                AdbFeatures.FixedPushMkdir,
                'apex',
                'abb',
                // only tells the client the symlink timestamp issue in `adb push --sync` has been fixed.
                // No special handling required.
                'fixed_push_symlink_timestamp',
                'abb_exec',
                'remount_shell',
                'track_app',
                'sendrecv_v2',
                'sendrecv_v2_brotli',
                'sendrecv_v2_lz4',
                'sendrecv_v2_zstd',
                'sendrecv_v2_dry_run_send',
            ].join(',');

            await sendPacket({
                command: AdbCommand.Connect,
                arg0: version,
                arg1: maxPayloadSize,
                // The terminating `;` is required in formal definition
                // But ADB daemon (all versions) can still work without it
                payload: encodeUtf8(`host::features=${features};`),
            });

            banner = await resolver.promise;
        } finally {
            // When failed, release locks on `connection` so the caller can try again.
            // When success, also release locks so `AdbPacketDispatcher` can use them.
            abortController.abort();
            writer.releaseLock();

            // Wait until pipe stops (`ReadableStream` lock released)
            await pipe;
        }

        return new Adb(
            connection,
            version,
            maxPayloadSize,
            banner,
        );
    }

    private readonly dispatcher: AdbPacketDispatcher;

    public get disconnected() { return this.dispatcher.disconnected; }

    private _protocolVersion: number | undefined;
    public get protocolVersion() { return this._protocolVersion; }

    private _product: string | undefined;
    public get product() { return this._product; }

    private _model: string | undefined;
    public get model() { return this._model; }

    private _device: string | undefined;
    public get device() { return this._device; }

    private _features: AdbFeatures[] = [];
    public get features() { return this._features; }

    public readonly subprocess: AdbSubprocess;
    public readonly power: AdbPower;
    public readonly reverse: AdbReverseCommand;
    public readonly tcpip: AdbTcpIpCommand;

    public constructor(
        connection: ReadableWritablePair<AdbPacketData, AdbPacketInit>,
        version: number,
        maxPayloadSize: number,
        banner: string,
    ) {
        this.parseBanner(banner);

        let calculateChecksum: boolean;
        let appendNullToServiceString: boolean;
        if (version >= VERSION_OMIT_CHECKSUM) {
            calculateChecksum = false;
            appendNullToServiceString = false;
        } else {
            calculateChecksum = true;
            appendNullToServiceString = true;
        }

        this.dispatcher = new AdbPacketDispatcher(
            connection,
            {
                calculateChecksum,
                appendNullToServiceString,
                maxPayloadSize,
            }
        );

        this._protocolVersion = version;

        this.subprocess = new AdbSubprocess(this);
        this.power = new AdbPower(this);
        this.reverse = new AdbReverseCommand(this);
        this.tcpip = new AdbTcpIpCommand(this);
    }

    private parseBanner(banner: string): void {
        const pieces = banner.split('::');
        if (pieces.length > 1) {
            const props = pieces[1]!;
            for (const prop of props.split(';')) {
                if (!prop) {
                    continue;
                }

                const keyValue = prop.split('=');
                if (keyValue.length !== 2) {
                    continue;
                }

                const [key, value] = keyValue;
                switch (key) {
                    case AdbPropKey.Product:
                        this._product = value;
                        break;
                    case AdbPropKey.Model:
                        this._model = value;
                        break;
                    case AdbPropKey.Device:
                        this._device = value;
                        break;
                    case AdbPropKey.Features:
                        this._features = value!.split(',') as AdbFeatures[];
                        break;
                }
            }
        }
    }

    /**
     * Add a handler for incoming socket.
     * @param handler A function to call with new incoming sockets. It must return `true` if it accepts the socket.
     * @returns A function to remove the handler.
     */
    public onIncomingSocket(handler: AdbIncomingSocketHandler) {
        return this.dispatcher.onIncomingSocket(handler);
    }

    public async createSocket(service: string): Promise<AdbSocket> {
        return this.dispatcher.createSocket(service);
    }

    public async createSocketAndWait(service: string): Promise<string> {
        const socket = await this.createSocket(service);
        const gatherStream = new GatherStringStream();
        await socket.readable
            .pipeThrough(new DecodeUtf8Stream())
            .pipeTo(gatherStream);
        return gatherStream.result;
    }

    public async getProp(key: string): Promise<string> {
        const stdout = await this.subprocess.spawnAndWaitLegacy(
            ['getprop', key]
        );
        return stdout.trim();
    }

    public async rm(...filenames: string[]): Promise<string> {//: Promise<AdbSubprocessProtocol>
        // https://android.googlesource.com/platform/packages/modules/adb/+/1a0fb8846d4e6b671c8aa7f137a8c21d7b248716/client/adb_install.cpp#984
        await this.subprocess.shell([
            "rm",
            ...filenames.map((arg) => escapeArg(arg)),
            "</dev/null",
        ]);
        return "";
    }

    public install() {
        return install(this);
    }

    public async sync(): Promise<AdbSync> {
        const socket = await this.createSocket('sync:');
        return new AdbSync(this, socket);
    }

    public async framebuffer(): Promise<AdbFrameBuffer> {
        return framebuffer(this);
    }

    /**
     * Close the ADB connection.
     *
     * Note that it won't close the streams from backends.
     * The streams are both physically and logically intact,
     * and can be reused.
     */
    public async close(): Promise<void> {
        await this.dispatcher.close();
    }
}