import {
    CHANGE,
    HidKeyboardAction,
    HidKeyboardCmd,
    HidKeyboardCmdPack,
    HidKeyboardModifiers,
    SRV_HID_KEYBOARD,
} from "../jdom/constants"
import { Packet } from "../jdom/packet"
import { JDServiceServer, JDServerOptions } from "../jdom/servers/serviceserver"
import { SMap } from "../jdom/utils"

export class HIDKeyboardServer extends JDServiceServer {
    private _lastKey: [number, HidKeyboardModifiers, HidKeyboardAction][]

    constructor(options?: JDServerOptions) {
        super(SRV_HID_KEYBOARD, options)

        this.addCommand(HidKeyboardCmd.Clear, this.handleClear.bind(this))
        this.addCommand(HidKeyboardCmd.Key, this.handleKey.bind(this))
    }

    get lastKey() {
        return this._lastKey
    }

    private handleKey(pkt: Packet) {
        const [rest] = pkt.jdunpack<
            [[number, HidKeyboardModifiers, HidKeyboardAction][]]
        >(HidKeyboardCmdPack.Key)
        this._lastKey = rest
        this.emit(CHANGE)
    }

    private handleClear() {
        if (this._lastKey) {
            this._lastKey = undefined
            this.emit(CHANGE)
        }
    }
}
/**
 * @internal
 */
export const selectors: SMap<number> = {
    a: 0x04,
    b: 0x05,
    c: 0x06,
    d: 0x07,
    e: 0x08,
    f: 0x09,
    g: 0x0a,
    h: 0x0b,
    i: 0x0c,
    j: 0x0d,
    k: 0x0e,
    l: 0x0f,
    m: 0x10,
    n: 0x11,
    o: 0x12,
    p: 0x13,
    q: 0x14,
    r: 0x15,
    s: 0x16,
    t: 0x17,
    u: 0x18,
    v: 0x19,
    w: 0x1a,
    x: 0x1b,
    y: 0x1c,
    z: 0x1d,

    "1": 0x1e,
    "2": 0x1f,
    "3": 0x20,
    "4": 0x21,
    "5": 0x22,
    "6": 0x23,
    "7": 0x24,
    "8": 0x25,
    "9": 0x26,
    "0": 0x27,

    "!": 0x1e,
    "@": 0x1f,
    "#": 0x20,
    $: 0x21,
    "%": 0x22,
    "^": 0x23,
    "&": 0x24,
    "*": 0x25,
    "(": 0x26,
    ")": 0x27,

    enter: 0x28,
    escape: 0x29,
    backspace: 0x2a,
    tab: 0x2b,
    space: 0x2c,
    " ": 0x2c,
    "-": 0x2d,
    _: 0x2d,
    "=": 0x2e,
    "+": 0x2e,
    "[": 0x2f,
    "{": 0x2f,
    "]": 0x30,
    "}": 0x30,
    "\\": 0x31,
    "|": 0x31,
    // non-US #
    "~": 0x32,
    ";": 0x33,
    ":": 0x33,
    "'": 0x34,
    '"': 0x34,
    "`": 0x35,
    ",": 0x36,
    //"<": 0x37,
    ".": 0x37,
    //">": 0x37,
    "/": 0x38,
    "?": 0x38,
    capslock: 0x39,
    f1: 0x3a,
    f2: 0x3b,
    f3: 0x3c,
    f4: 0x3d,
    f5: 0x3e,
    f6: 0x3f,
    f7: 0x40,
    f8: 0x41,
    f9: 0x42,
    f10: 0x43,
    f11: 0x44,
    f12: 0x45,
    printscreen: 0x46,
    scrolllock: 0x47,
    pause: 0x48,
    insert: 0x49,
    home: 0x4a,
    pageup: 0x4b,
    delete: 0x4c,
    end: 0x4d,
    pagedown: 0x4e,
    arrowright: 0x4f,
    arrowleft: 0x50,
    arrowdown: 0x51,
    arrowup: 0x52,
    numlock: 0x53,
    numpaddivide: 0x54,
    numpadmultiply: 0x55,
    numpadsubstract: 0x56,
    numpadadd: 0x57,
    numpadenter: 0x58,
    numpad1: 0x59,
    numpad2: 0x5a,
    numpad3: 0x5b,
    numpad4: 0x5c,
    numpad5: 0x5d,
    numpad6: 0x5e,
    numpad7: 0x5f,
    numpad8: 0x60,
    numpad9: 0x61,
    numpad0: 0x62,
    numpaddecimal: 0x63,
    numpadequal: 0x67,
    f13: 0x68,
    f14: 0x69,
    f15: 0x6a,
    f16: 0x6b,
    f17: 0x6c,
    f18: 0x6d,
    f19: 0x6e,
    f20: 0x6f,
    f21: 0x70,
    f22: 0x71,
    f23: 0x72,
    f24: 0x73,
    execute: 0x74,
    help: 0x75,
    contextmenu: 0x76,
    select: 0x77,
    stop: 0x78,
    again: 0x79,
    undo: 0x7a,
    cut: 0x7b,
    copy: 0x7c,
    paste: 0x7d,
    find: 0x7e,
    mute: 0x7f,
    volumeup: 0x80,
    volumedown: 0x81,

    numpadcomma: 0x85,
}
/**
 * @internal
 */
export const reverseSelectors: { [index: number]: string } = Object.keys(
    selectors,
).reduce(
    (r, key) => {
        if (!r[selectors[key]]) r[selectors[key]] = key
        return r
    },
    {} as { [index: number]: string },
)

/**
 * @internal
 */
export const modifierCodes = {
    controlleft: HidKeyboardModifiers.LeftControl,
    altleft: HidKeyboardModifiers.LeftAlt,
    shiftleft: HidKeyboardModifiers.LeftShift,
    metaleft: HidKeyboardModifiers.LeftGUI,

    controlright: HidKeyboardModifiers.RightControl,
    altright: HidKeyboardModifiers.RightAlt,
    shiftright: HidKeyboardModifiers.RightShift,
    metaright: HidKeyboardModifiers.RightGUI,
}

/**
 * @internal
 */
export function renderKeyboardKey(
    selector: number,
    modifiers: HidKeyboardModifiers,
    pretty: boolean,
) {
    const flags = pretty
        ? [
              "Ctrl",
              "Shift",
              "Alt",
              "Cmd",
              "Ctrl Right",
              "Shift Right",
              "AltRight",
              "Cmd Right",
          ]
        : [
              "{controlleft}",
              "{shiftleft}",
              "{altleft}",
              "{metaleft}",
              "{controlright}",
              "{shiftright}",
              "{altright}",
              "{metaright}",
          ]
    const sep = pretty ? " + " : " "
    const values = []
    flags.forEach((flag, i) => {
        if (modifiers & (1 << i)) {
            values.push(flag)
        }
    })
    const sel = reverseSelectors[selector]
    if (sel !== undefined)
        values.push(
            pretty
                ? sel.toUpperCase()
                : !pretty && sel.length > 1
                ? `{${sel}}`
                : sel,
        )
    const value = values.filter(v => !!v).join(sep)
    return value
}