import { useCallback, useMemo } from 'react';
import { useSocket } from '../context/SocketContext.jsx';
import { useSessionSelector } from '../context/SessionContext.jsx';
import {
  AUX_LIMITS,
  COMMAND_DELAY_MS,
  OI_COMMANDS,
  SONG_DEFAULT_DURATION,
  SONG_DEFAULT_NOTE,
  SONG_NOTE_RANGE,
} from './constants.js';
import { bytesToBase64, clampRange, sleep } from './controlMath.js';

export function useCommandPipeline(options = {}) {
  const { driveTransform, auxTransform } = options;
  const socket = useSocket();
  const session = useSessionSelector((state) => state.session);
  const roverId = session?.assignment?.roverId;

  const rosterEntry = useMemo(() => {
    if (!roverId || !Array.isArray(session?.roster)) return null;
    return session.roster.find((entry) => String(entry.id) === String(roverId)) || null;
  }, [roverId, session?.roster]);

  const servoConfig = useMemo(() => {
    if (!rosterEntry?.cameraServo || !rosterEntry.cameraServo.enabled) return null;
    return rosterEntry.cameraServo;
  }, [rosterEntry]);

  const nightVision = useMemo(() => {
    if (!rosterEntry?.nightVision || !rosterEntry.nightVision.enabled) return null;
    return rosterEntry.nightVision;
  }, [rosterEntry]);

  const horn = useMemo(() => {
    if (!rosterEntry?.horn || !rosterEntry.horn.enabled) return null;
    return rosterEntry.horn;
  }, [rosterEntry]);

  const nightVisionState = useMemo(() => rosterEntry?.nightVision?.state ?? null, [rosterEntry]);

  const emitCommand = useCallback(
    (payload, cb) => {
      if (!roverId) return;
      socket.emit('command', { roverId, ...payload }, cb);
    },
    [socket, roverId],
  );

  const enableSensorStream = useCallback(() => {
    if (!roverId) return;
    emitCommand({
      type: 'sensorStream',
      data: { sensorStream: { enable: true } },
    });
  }, [emitCommand, roverId]);

  const sendDriveDirect = useCallback(
    (speeds) => {
      if (!roverId) return null;
      const rawPayload = {
        left: clampRange(speeds?.left ?? 0, [-500, 500]),
        right: clampRange(speeds?.right ?? 0, [-500, 500]),
      };
      const transformed = driveTransform ? driveTransform(rawPayload) : rawPayload;
      const payload = {
        left: clampRange(transformed?.left ?? 0, [-500, 500]),
        right: clampRange(transformed?.right ?? 0, [-500, 500]),
      };
      emitCommand({
        type: 'drive',
        data: { driveDirect: payload },
      });
      return payload;
    },
    [driveTransform, emitCommand, roverId],
  );

  const sendAuxMotors = useCallback(
    ({ main = 0, side = 0, vacuum = 0 } = {}) => {
      if (!roverId) return null;
      const rawPayload = {
        main: clampRange(main, AUX_LIMITS.main),
        side: clampRange(side, AUX_LIMITS.side),
        vacuum: clampRange(vacuum, AUX_LIMITS.vacuum),
      };
      const transformed = auxTransform ? auxTransform(rawPayload) : rawPayload;
      const payload = {
        main: clampRange(transformed?.main ?? 0, AUX_LIMITS.main),
        side: clampRange(transformed?.side ?? 0, AUX_LIMITS.side),
        vacuum: clampRange(transformed?.vacuum ?? 0, AUX_LIMITS.vacuum),
      };
      emitCommand({
        type: 'motors',
        data: { motorPwm: payload },
      });
      return payload;
    },
    [auxTransform, emitCommand, roverId],
  );

  const sendServoAngle = useCallback(
    (angle) => {
      if (!roverId || !servoConfig) return null;
      emitCommand({
        type: 'servo',
        data: { servo: { angle } },
      });
      return angle;
    },
    [emitCommand, roverId, servoConfig],
  );

  const sendOiCommand = useCallback(
    (keyOrBytes) => {
      if (!roverId) return false;
      const bytes = Array.isArray(keyOrBytes)
        ? keyOrBytes
        : typeof keyOrBytes === 'string'
        ? OI_COMMANDS[keyOrBytes]
        : null;
      if (!bytes) return false;
      emitCommand({
        type: 'raw',
        data: { raw: bytesToBase64(bytes) },
      });
      enableSensorStream();
      return true;
    },
    [emitCommand, enableSensorStream, roverId],
  );

  const runMacroSteps = useCallback(
    async (macro) => {
      if (!macro || !Array.isArray(macro.steps) || !roverId) return;
      for (const step of macro.steps) {
        if (!roverId) break;
        switch (step.type) {
          case 'oi':
            sendOiCommand(step.command);
            break;
          case 'drive':
            sendDriveDirect(step.speeds ?? { left: 0, right: 0 });
            break;
          case 'motors':
            sendAuxMotors(step.values ?? {});
            break;
          case 'servo':
            sendServoAngle(step.angle);
            break;
          case 'pause':
            await sleep(step.duration ?? COMMAND_DELAY_MS); // eslint-disable-line no-await-in-loop
            break;
          default:
            break;
        }
        if (step.delay || step.delayMs) {
          const delay = step.delayMs ?? step.delay;
          if (typeof delay === 'number' && delay > 0) {
            await sleep(delay); // eslint-disable-line no-await-in-loop
          }
        }
      }
    },
    [roverId, sendOiCommand, sendDriveDirect, sendAuxMotors, sendServoAngle],
  );

  const sendNightVision = useCallback(
    (action = 'toggle') => {
      if (!roverId || !nightVision) return null;
      emitCommand({
        type: 'nightVision',
        data: { nightVision: { action } },
      });
      return action;
    },
    [emitCommand, nightVision, roverId],
  );

  const sendHorn = useCallback(
    (payload) => {
      if (!roverId) return null;
      emitCommand({
        type: 'horn',
        data: { horn: payload },
      });
      return payload;
    },
    [emitCommand, roverId],
  );

  const sendSong = useCallback(
    (notes = [], options = {}) => {
      if (!roverId) return null;
      const prepared =
        Array.isArray(notes) && notes.length > 0
          ? notes
          : [{ note: SONG_DEFAULT_NOTE, duration: SONG_DEFAULT_DURATION }];
      const payloadNotes = prepared.slice(0, 16).map((entry) => ({
        note: clampRange(Math.round(entry?.note ?? SONG_DEFAULT_NOTE), SONG_NOTE_RANGE),
        duration: clampRange(Math.round(entry?.duration ?? SONG_DEFAULT_DURATION), [1, 255]),
      }));
      emitCommand({
        type: 'song',
        data: {
          song: {
            notes: payloadNotes,
            slot: options.slot,
            loop: options.loop,
          },
        },
      });
      return payloadNotes;
    },
    [emitCommand, roverId],
  );

  return useMemo(
    () => ({
      roverId,
      rosterEntry,
      servoConfig,
      nightVision,
      nightVisionState,
      horn,
      emitCommand,
      enableSensorStream,
      sendDriveDirect,
      sendAuxMotors,
      sendServoAngle,
      sendOiCommand,
      sendNightVision,
      sendHorn,
      sendSong,
      runMacroSteps,
    }),
    [
      roverId,
      rosterEntry,
      servoConfig,
      nightVision,
      nightVisionState,
      horn,
      emitCommand,
      enableSensorStream,
      sendDriveDirect,
      sendAuxMotors,
      sendServoAngle,
      sendOiCommand,
      sendNightVision,
      sendHorn,
      runMacroSteps,
    ],
  );
}