/* @flow */


import TrezorConnect, {
    UI, DEVICE, DEVICE_EVENT, UI_EVENT, TRANSPORT_EVENT,
} from 'trezor-connect';
import * as TOKEN from './constants/token';
import * as CONNECT from './constants/TrezorConnect';
import * as NOTIFICATION from './constants/notification';
import * as WALLET from './constants/wallet';

import { push } from 'react-router-redux';
import * as DiscoveryActions from './DiscoveryActions';
import { resolveAfter } from '../utils/promiseUtils';


import type {
    Device,
    DeviceMessage,
    UiMessage,
    TransportMessage,
    DeviceMessageType,
    TransportMessageType,
    UiMessageType,
} from 'trezor-connect';

import type {
    Dispatch,
    GetState,
    Action,
    ThunkAction,
    AsyncAction,
    TrezorDevice,
    RouterLocationState,
} from '~/flowtype';


export type TrezorConnectAction = {
    type: typeof CONNECT.INITIALIZATION_ERROR,
    error: string
} | {
    type: typeof CONNECT.COIN_CHANGED,
    payload: {
        network: string
    }
} | {
    type: typeof CONNECT.AUTH_DEVICE,
    device: TrezorDevice,
    state: string
} | {
    type: typeof CONNECT.DUPLICATE,
    device: TrezorDevice
} | {
    type: typeof CONNECT.REMEMBER_REQUEST,
    device: TrezorDevice,
    instances: Array<TrezorDevice>
} | {
    type: typeof CONNECT.DISCONNECT_REQUEST,
    device: TrezorDevice
} | {
    type: typeof CONNECT.FORGET_REQUEST,
    device: TrezorDevice
} | {
    type: typeof CONNECT.FORGET,
    device: TrezorDevice
} | {
    type: typeof CONNECT.FORGET_SINGLE,
    device: TrezorDevice
} | {
    type: typeof CONNECT.REMEMBER,
    device: TrezorDevice
} | {
    type: typeof CONNECT.TRY_TO_DUPLICATE,
    device: TrezorDevice
} | {
    type: typeof CONNECT.DEVICE_FROM_STORAGE,
    payload: Array<TrezorDevice>
} | {
    type: typeof CONNECT.START_ACQUIRING,
} | {
    type: typeof CONNECT.STOP_ACQUIRING,
};


export const init = (): AsyncAction => async (dispatch: Dispatch, getState: GetState): Promise<void> => {
    // set listeners
    TrezorConnect.on(DEVICE_EVENT, (event: DeviceMessage): void => {
        // post event to reducers
        const type: DeviceMessageType = event.type; // assert flow type
        dispatch({
            type,
            device: event.payload,
        });
    });

    TrezorConnect.on(UI_EVENT, (event: UiMessage): void => {
        // post event to reducers
        const type: UiMessageType = event.type; // assert flow type
        dispatch({
            type,
            payload: event.payload,
        });
    });

    TrezorConnect.on(TRANSPORT_EVENT, (event: TransportMessage): void => {
        // post event to reducers
        const type: TransportMessageType = event.type; // assert flow type
        dispatch({
            type,
            payload: event.payload,
        });
    });

    try {
        await TrezorConnect.init({
            transportReconnect: true,
            connectSrc: typeof window.LOCAL === 'string' ? window.LOCAL : 'https://connect.trezor.io/5/',
            // connectSrc: 'https://connect.trezor.io/5/',
            // connectSrc: 'https://sisyfos.trezor.io/',
            debug: true,
            popup: false,
            webusb: true,
            pendingTransportEvent: (getState().devices.length < 1),
        });
    } catch (error) {
        // dispatch({
        //     type: CONNECT.INITIALIZATION_ERROR,
        //     error
        // })
    }
};

// called after backend was initialized
// set listeners for connect/disconnect
export const postInit = (): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
    const handleDeviceConnect = (device: Device) => {
        dispatch(initConnectedDevice(device));
    };

    TrezorConnect.off(DEVICE.CONNECT, handleDeviceConnect);
    TrezorConnect.off(DEVICE.CONNECT_UNACQUIRED, handleDeviceConnect);

    TrezorConnect.on(DEVICE.CONNECT, handleDeviceConnect);
    TrezorConnect.on(DEVICE.CONNECT_UNACQUIRED, handleDeviceConnect);

    const { devices } = getState();

    const { initialPathname, initialParams } = getState().wallet;

    if (initialPathname) {
        dispatch({
            type: WALLET.SET_INITIAL_URL,
            // pathname: null,
            // params: null
        });
    }

    if (devices.length > 0) {
        const unacquired: ?TrezorDevice = devices.find(d => d.features);
        if (unacquired) {
            dispatch(onSelectDevice(unacquired));
        } else {
            const latest: Array<TrezorDevice> = sortDevices(devices);
            const firstConnected: ?TrezorDevice = latest.find(d => d.connected);
            dispatch(onSelectDevice(firstConnected || latest[0]));

            // TODO
            if (initialParams) {
                if (!initialParams.hasOwnProperty('network') && initialPathname !== getState().router.location.pathname) {
                    // dispatch( push(initialPathname) );
                } else {

                }
            }
        }
    }
};

const sortDevices = (devices: Array<TrezorDevice>): Array<TrezorDevice> => devices.sort((a, b) => {
    if (!a.ts || !b.ts) {
        return -1;
    }
    return a.ts > b.ts ? -1 : 1;
});

export const initConnectedDevice = (device: TrezorDevice | Device): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
    const selected = getState().wallet.selectedDevice;
    // if (!selected || (selected && selected.state)) {
    dispatch(onSelectDevice(device));
    // }
    // if (device.unacquired && selected && selected.path !== device.path && !selected.connected) {
    //     dispatch( onSelectDevice(device) );
    // } else if (!selected) {
    //     dispatch( onSelectDevice(device) );
    // }
};

// selection from Aside dropdown button
// after device_connect event
// or after acquiring device
// device type could be local TrezorDevice or Device (from trezor-connect device_connect event)
export const onSelectDevice = (device: TrezorDevice | Device): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
    // || device.isUsedElsewhere

    // switch to initial url and reset this value

    if (!device.features) {
        dispatch(push(`/device/${device.path}/acquire`));
    } else if (device.features.bootloader_mode) {
        dispatch(push(`/device/${device.path}/bootloader`));
    } else if (!device.features.initialized) {
        dispatch(push(`/device/${device.features.device_id}/initialize`));
    } else if (typeof device.instance === 'number') {
        dispatch(push(`/device/${device.features.device_id}:${device.instance}`));
    } else {
        const deviceId: string = device.features.device_id;
        const urlParams: RouterLocationState = getState().router.location.state;
        // let url: string = `/device/${ device.features.device_id }/network/ethereum/account/0`;
        let url: string = `/device/${deviceId}`;
        let instance: ?number;
        // check if device is not TrezorDevice type
        if (!device.hasOwnProperty('ts')) {
            // its device from trezor-connect (called in initConnectedDevice triggered by device_connect event)
            // need to lookup if there are unavailable instances
            const available: Array<TrezorDevice> = getState().devices.filter(d => d.path === device.path);
            const latest: Array<TrezorDevice> = sortDevices(available);

            if (latest.length > 0 && latest[0].instance) {
                url += `:${latest[0].instance}`;
                instance = latest[0].instance;
            }
        }
        // check if current location is not set to this device
        //dispatch( push(`/device/${ device.features.device_id }/network/etc/account/0`) );

        if (urlParams.deviceInstance !== instance || urlParams.device !== deviceId) {
            dispatch(push(url));
        }
    }
};

export const switchToFirstAvailableDevice = (): AsyncAction => async (dispatch: Dispatch, getState: GetState): Promise<void> => {
    const { devices } = getState();
    if (devices.length > 0) {
        // TODO: Priority:
        // 1. First Unacquired
        // 2. First connected
        // 3. Saved with latest timestamp
        const unacquired = devices.find(d => !d.features);
        if (unacquired) {
            dispatch(initConnectedDevice(unacquired));
        } else {
            const latest: Array<TrezorDevice> = sortDevices(devices);
            const firstConnected: ?TrezorDevice = latest.find(d => d.connected);
            dispatch(onSelectDevice(firstConnected || latest[0]));
        }
    } else {
        dispatch(push('/'));
    }
};


export const getSelectedDeviceState = (): AsyncAction => async (dispatch: Dispatch, getState: GetState): Promise<void> => {
    const selected = getState().wallet.selectedDevice;
    if (selected
            && selected.connected
            && (selected.features && !selected.features.bootloader_mode && selected.features.initialized)
            && !selected.state) {
        const response = await TrezorConnect.getDeviceState({
            device: {
                path: selected.path,
                instance: selected.instance,
                state: selected.state,
            },
            useEmptyPassphrase: !selected.instance,
        });

        if (response && response.success) {
            dispatch({
                type: CONNECT.AUTH_DEVICE,
                device: selected,
                state: response.payload.state,
            });
        } else {
            dispatch({
                type: NOTIFICATION.ADD,
                payload: {
                    devicePath: selected.path,
                    type: 'error',
                    title: 'Authentication error',
                    message: response.payload.error,
                    cancelable: false,
                    actions: [
                        {
                            label: 'Try again',
                            callback: () => {
                                dispatch({
                                    type: NOTIFICATION.CLOSE,
                                    payload: { devicePath: selected.path },
                                });
                                dispatch(getSelectedDeviceState());
                            },
                        },
                    ],
                },
            });
        }
    }
};

export const deviceDisconnect = (device: Device): AsyncAction => async (dispatch: Dispatch, getState: GetState): Promise<void> => {
    const selected: ?TrezorDevice = getState().wallet.selectedDevice;

    if (device && device.features) {
        if (selected && selected.features && selected.features.device_id === device.features.device_id) {
            dispatch(DiscoveryActions.stop(selected));
        }

        const instances = getState().devices.filter(d => d.features && device.features && d.state && !d.remember && d.features.device_id === device.features.device_id);
        if (instances.length > 0) {
            dispatch({
                type: CONNECT.REMEMBER_REQUEST,
                device: instances[0],
                instances,
            });
        }
    }
};

export const coinChanged = (network: ?string): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
    const selected: ?TrezorDevice = getState().wallet.selectedDevice;
    if (!selected) return;

    dispatch(DiscoveryActions.stop(selected));

    if (network) {
        dispatch(DiscoveryActions.start(selected, network));
    }
};

export function reload(): AsyncAction {
    return async (dispatch: Dispatch, getState: GetState): Promise<void> => {
    };
}

export function acquire(): AsyncAction {
    return async (dispatch: Dispatch, getState: GetState): Promise<void> => {
        const selected: ?TrezorDevice = getState().wallet.selectedDevice;
        if (!selected) return;

        dispatch({
            type: CONNECT.START_ACQUIRING,
        });

        const response = await TrezorConnect.getFeatures({
            device: {
                path: selected.path,
            },
            useEmptyPassphrase: !selected.instance,
        });

        if (!response.success) {
            dispatch({
                type: NOTIFICATION.ADD,
                payload: {
                    type: 'error',
                    title: 'Acquire device error',
                    message: response.payload.error,
                    cancelable: true,
                    // actions: [
                    //     {
                    //         label: 'Try again',
                    //         callback: () => {
                    //             dispatch(acquire())
                    //         }
                    //     }
                    // ]
                },
            });
        }

        dispatch({
            type: CONNECT.STOP_ACQUIRING,
        });
    };
}

export const gotoDeviceSettings = (device: TrezorDevice): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
    if (device.features) {
        const devUrl: string = `${device.features.device_id}${device.instance ? `:${device.instance}` : ''}`;
        dispatch(push(`/device/${devUrl}/settings`));
    }
};

// called from Aside - device menu (forget single instance)
export const forget = (device: TrezorDevice): Action => ({
    type: CONNECT.FORGET_REQUEST,
    device,
});

export const duplicateDevice = (device: TrezorDevice): AsyncAction => async (dispatch: Dispatch, getState: GetState): Promise<void> => {
    dispatch({
        type: CONNECT.TRY_TO_DUPLICATE,
        device,
    });
};


export function addAccount(): ThunkAction {
    return (dispatch: Dispatch, getState: GetState): void => {
        const selected = getState().wallet.selectedDevice;
        if (!selected) return;
        dispatch(DiscoveryActions.start(selected, getState().router.location.state.network, true)); // TODO: network nicer
    };
}