import { IActivity } from "../Models/Activity";
import { IDeviceSetupItem } from "../Models/DeviceSetupItem";
import { IInput, IMatrix, IOutput } from "../Models/Matrix";
import { RemoteKey } from '../Accessories/ControlUnit';
import { sleep } from '../Util/Sleep';

let Characteristic: HAPNodeJS.Characteristic;

const Harmony = require("harmony-websocket");
interface IDevice {
    id: string,
    name: string,
    supportsCommand(commandName: string): boolean,
    getCommand(commandName: string): string,
    commands: { [name: string]: string };
    on: boolean;
}

interface IActivityState {
    currentActivity: IActivity
}

interface IHarmonyDataProviderProps {
    hubAddress: string,
    log: any,
    matrix: IMatrix
}

class HarmonyDataProvider {
    private harmony: any;
    private log: any;
    private hubAddress: string = "";
    private connected: boolean = false;

    private devices: { [name: string]: IDevice; } = {};
    private states: { [controlUnitName: string]: (IActivityState | undefined) } = {};

    private matrix: IMatrix;

    constructor(props: IHarmonyDataProviderProps) {
        this.log = props.log;
        this.hubAddress = props.hubAddress;
        this.matrix = props.matrix;

        this.harmony = new Harmony();

        //Listeners
        this.harmony.on('open', () => {
            this.connected = true;
        });
        this.harmony.on('close', () => {
            this.connected = false;
        });

        this.connect();
    }

    /**
     * Power on all devices in an activity.
     */
    public powerOn = async (controlUnitName: string, activity: IActivity) => {
        //Only power on if not alread on
        let currentActivity = this.states[controlUnitName] ? this.states[controlUnitName]!.currentActivity : undefined;
        if (!currentActivity) {
            await this.startActivity(controlUnitName, activity);
        }
    }

    /**
     * Power off all devices in an activity that aren't being used.
     */
    public powerOff = async (controlUnitName: string) => {
        if (!this.states[controlUnitName]) {
            return;
        }
        //Build potential list of devices to turn off
        let devicesToTurnOff: Array<IDevice> = this.states[controlUnitName]!.currentActivity.DeviceSetupList
            .map((value: IDeviceSetupItem): IDevice => {
                return this.getDeviceFromName(value.DeviceName);
            });

        //Resolve device conflicts with other controlUnits
        devicesToTurnOff = this.sanitizeDeviceList(devicesToTurnOff, controlUnitName);

        //Turn off devices
        devicesToTurnOff.forEach((device: IDevice) => {
            this.powerOffDevice(device);
        });

        this.states[controlUnitName] = undefined;
    }

    /**
     * Start an activity
     */
    public startActivity = async (controlUnitName: string, activity: IActivity) => {
        this.log(`Starting activity ${activity.DisplayName} for controlUnit: ${controlUnitName}`)
        let lastActivity: IActivity | undefined = undefined;
        if (this.states[controlUnitName]) {
            lastActivity = this.states[controlUnitName]!.currentActivity;
        }

        //Build potential list of devices to to turn on
        let devicesToTurnOn: Array<IDevice> = activity.DeviceSetupList.map((value: IDeviceSetupItem): IDevice => {
            return this.getDeviceFromName(value.DeviceName);
        });

        //Resolve device conflicts with other controlUnits
        devicesToTurnOn = this.sanitizeDeviceList(devicesToTurnOn, controlUnitName);

        //Turn on devices
        await Promise.all(devicesToTurnOn.map(async (device: IDevice) => {
            if (device && device.name && this.devices[device.name]) {
                if (!device.on) {
                    this.log(`Turning on device ${device.name}`)
                    await this.powerOnDevice(device);
                }
            }
        }));

        //Assign correct input
        await Promise.all(
            activity.DeviceSetupList.map(async (value: IDeviceSetupItem) => {
                let device: IDevice = this.getDeviceFromName(value.DeviceName);

                if (device && device.supportsCommand(`Input${value.Input}`)) {
                    let command: string = device.getCommand(`Input${value.Input}`);
                    await this.sendCommand(command);
                }
            })
        );

        if (activity.UseMatrix) {
            //get input and output
            let input: IInput = this.matrix.Inputs.filter(e => e.InputDevice === activity.ControlDevice)[0];
            let output: IOutput = this.matrix.Outputs.filter(e => e.OutputDevice === activity.OutputDevice)[0];

            let inputCommandName: string = `In ${input.InputNumber}`;
            let outputCommandName: string = `Out ${output.OutputLetter}`;

            let matrixDevice: IDevice = this.getDeviceFromName(this.matrix.DeviceName);

            //Route hdmi
            if (matrixDevice.supportsCommand(inputCommandName) && matrixDevice.supportsCommand(outputCommandName)) {
                await this.sendCommand(matrixDevice.getCommand(outputCommandName));
                await this.sendCommand(matrixDevice.getCommand(inputCommandName));
                await this.sendCommand(matrixDevice.getCommand(outputCommandName));
                await this.sendCommand(matrixDevice.getCommand(inputCommandName));
            }
        }

        //Build potential list of devices to turn off
        if (lastActivity) {
            let devicesToTurnOff: Array<IDevice> = lastActivity.DeviceSetupList.map((value: IDeviceSetupItem): IDevice => {
                return this.getDeviceFromName(value.DeviceName);
            });

            //remove devices that will be used for next activity from list
            //delete array[index] is stupid because it just nulls out the index. But now i have to deal with nulls
            devicesToTurnOff.forEach((device: IDevice, index: number) => {
                if (device && device.name && activity.DeviceSetupList.some(e => {
                    return (e && e.DeviceName === device.name)
                })) {
                    delete devicesToTurnOff[index];
                }
            })

            //Resolve device conflicts with other controlUnits
            devicesToTurnOff = this.sanitizeDeviceList(devicesToTurnOff, controlUnitName);

            this.log(`Sanatized devices to turn off: ${JSON.stringify(devicesToTurnOff.map(e => e ? e.name : ""))}`);

            await Promise.all(
                //Turn off devices
                devicesToTurnOff.map(async (device: IDevice) => {
                    if (device) {
                        if (device.on) {
                            this.log(`Turning off device ${device.name}`)
                            await this.powerOffDevice(device);
                        }
                    }
                })
            );

        }

        //Assign current activity
        this.states[controlUnitName] = { currentActivity: activity };
    }

    /**
     * Turn the volume up for the current running activity.
     */
    public volumeUp = async (controlUnitName: string) => {
        let volumeUpCommand: string = "Volume Up"
        if (this.states[controlUnitName]) {
            let volumeDevice: IDevice = this.getDeviceFromName(this.states[controlUnitName]!.currentActivity.VolumeDevice);
            if (volumeDevice.supportsCommand(volumeUpCommand)) {
                this.sendCommand(volumeDevice.getCommand(volumeUpCommand));
            }
        }
    }

    /**
     * Volume down for current running activity.
     */
    public volumeDown = async (controlUnitName: string) => {
        let volumeDownCommand: string = "Volume Down"
        if (this.states[controlUnitName]) {
            let volumeDevice: IDevice = this.getDeviceFromName(this.states[controlUnitName]!.currentActivity.VolumeDevice);
            if (volumeDevice.supportsCommand(volumeDownCommand)) {
                this.sendCommand(volumeDevice.getCommand(volumeDownCommand));
            }
        }
    }

    /**
     * Send key press for current activity.
     * 
     * @param controlUnitName The name of the control unit to act on.
     * @param key The key to send.
     */
    public sendKeyPress = async (controlUnitName: string, key: any) => {
        if (this.states[controlUnitName]) {
            let commandName: string = "";

            let device: IDevice = this.getDeviceFromName(this.states[controlUnitName]!.currentActivity.ControlDevice);
            switch (key) {
                case RemoteKey.ARROW_UP: {
                    commandName = "Direction Up";
                    break;
                }
                case RemoteKey.ARROW_DOWN: {
                    commandName = "Direction Down";
                    break;
                }
                case RemoteKey.ARROW_LEFT: {
                    commandName = "Direction Left";
                    break;
                }
                case RemoteKey.ARROW_RIGHT: {
                    commandName = "Direction Right";
                    break;
                }
                case RemoteKey.SELECT: {
                    commandName = "Select";
                    break;
                }
                case RemoteKey.PLAY_PAUSE: {
                    commandName = "Pause";
                    break;
                }
                case RemoteKey.INFORMATION: {
                    commandName = "Menu";
                    break;
                }
                case RemoteKey.BACK: {
                    commandName = "Back";
                    break;
                }
                case RemoteKey.EXIT: {
                    commandName = "Back";
                    break;
                }
            }

            if (device && device.supportsCommand(commandName)) {
                this.sendCommand(device.getCommand(commandName));
            }
        }
    }

    /**
     * Return if a control unit is active
     * @param controlUnitName 
     */
    public getIsActive(controlUnitName: string): IActivity | undefined {
        return this.states[controlUnitName] ? this.states[controlUnitName]!.currentActivity : undefined;
    }

    /**
     * Gets device button commands
     * @param deviceCommandName The device command name
     * @param deviceName The device name
     */
    public getCommand(deviceCommandName: string, deviceName: string): string {
        const device: IDevice = this.getDeviceFromName(deviceName);
        if (device && device.supportsCommand(deviceCommandName)) {
            return device.getCommand(deviceCommandName);
        } else {
            return "";
        }
    }

    /**
     * Send a command to the harmony hub.
     * @param command The command to send.
     */
    public sendCommand = async (command: string) => {
        try {
            //Execute command
            let response = await this.harmony.sendCommand(JSON.stringify(command));

            //Sleep
            await sleep(800);
        } catch (err) {
            this.log(`ERROR - error sending command to harmony: ${err}`);
        }

    }

    /**
     * Connect to harmony and receive device info
     */
    private connect = async () => {
        await this.harmony.connect(this.hubAddress);
        let self = this;

        setTimeout(async function () {
            if (self.connected) {
                let devices: any = await self.harmony.getDevices();
                try {
                    await Promise.all(
                        //Add each to dictionary
                        devices.map(async (dev: any) => {
                            //get commands
                            let commands: { [name: string]: string } = {};
                            let deviceCommands: any = await self.harmony.getDeviceCommands(dev.id);
                            deviceCommands.forEach((command: any) => {
                                commands[command.label] = command.action;
                            });
                            self.devices[dev.label] = {
                                id: dev.id,
                                name: dev.label,
                                commands: commands,
                                on: false,
                                //Define device methods
                                supportsCommand(commandName: string): boolean {
                                    let command = commands[commandName];
                                    return (command) ? true : false;
                                },
                                getCommand(commandName: string): string {
                                    return commands[commandName];
                                }
                            }
                        }));
                    self.log(`Harmony data provider ready`);

                } catch (err) {
                    self.log(`ERROR - error connecting to harmony: ${err}`);
                }
            }
        }, 1000);
    }

    /**
     * Power off a device (Power toggle if no power off).
     */
    private powerOffDevice = async (device: IDevice) => {
        let powerOffCommand: string = "Power Off";
        let powerToggleCommand: string = "Power Toggle";
        if (device && device.supportsCommand(powerOffCommand)) {
            await this.sendCommand(device.getCommand(powerOffCommand));
            device.on = false;
        } else if (device && device.supportsCommand(powerToggleCommand)) {
            await this.sendCommand(device.getCommand(powerToggleCommand));
            device.on = false;
        }
    }

    /**
     * Power on a device (Power toggle if no power on).
     */
    private powerOnDevice = async (device: IDevice) => {
        let powerOnCommand: string = "Power On";
        let powerToggleCommand: string = "Power Toggle";
        if (device && device.supportsCommand(powerOnCommand)) {
            await this.sendCommand(device.getCommand(powerOnCommand));
            device.on = true;
        } else if (device && device.supportsCommand(powerToggleCommand)) {
            await this.sendCommand(device.getCommand(powerToggleCommand));
            device.on = true;
        }
    }

    /**
     * Get the IDevice by name.
     * @param deviceName The device to retrieve.
     */
    private getDeviceFromName(deviceName: string): IDevice {
        return this.devices[deviceName];
    }

    /**
     * Helper function to make sure no control unit depends on device list.
     * @param devicesToTurnOn The list of devices to modify.
     * @param controlUnitName The name of the control unit in question.
     */
    private sanitizeDeviceList(devicesToTurnOn: Array<IDevice>, controlUnitName: string): Array<IDevice> {
        for (let controlUnitKey in this.states) {
            //Skip self
            if (controlUnitKey === controlUnitName) {
                continue;
            }
            let currentOtherState: IActivityState = this.states[controlUnitKey]!;

            if (currentOtherState) {
                currentOtherState.currentActivity.DeviceSetupList.forEach((value: IDeviceSetupItem) => {
                    //there are devices to remove
                    if (devicesToTurnOn.some(e => e && e.name === value.DeviceName)) {
                        let deviceToRemove: IDevice = devicesToTurnOn.filter(i => i.name === value.DeviceName)[0];
                        delete devicesToTurnOn[devicesToTurnOn.indexOf(deviceToRemove)];
                    }
                });
            }
        }

        return devicesToTurnOn;
    }
}

export default HarmonyDataProvider;