"use client";

import { useEffect, useMemo, useState } from "react";
import { useRouter } from "next/navigation";
import { toast } from "sonner";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Slider } from "@/components/ui/slider";
import { DeviceScanPanel } from "@/components/control/DeviceScanPanel";
import { DeviceRemapDialog } from "./DeviceRemapDialog";
import { getButtplugClientHandle, startScanning, stopScanning } from "@/lib/buttplug/client";
import { eventBuffer } from "@/lib/buttplug/event-buffer";
import { RecordingPlayer, type RecordingEventRow } from "@/lib/buttplug/player";
import { useButtplugStore } from "@/lib/buttplug/store";
import type { ActuatorInfo } from "@/lib/buttplug/types";
import type { RecordingDeviceSlot } from "@/lib/db/schema";
import { Pause, Play } from "lucide-react";

interface RecordingResponse {
  recording: {
    id: number;
    name: string;
    durationMs: number;
    deviceSlots: RecordingDeviceSlot[];
  };
  events: RecordingEventRow[];
}

function formatTime(ms: number): string {
  const totalSeconds = Math.floor(ms / 1000);
  return `${Math.floor(totalSeconds / 60)}:${(totalSeconds % 60).toString().padStart(2, "0")}`;
}

export function ReplayPlayer({ recordingId }: { recordingId: number }) {
  const router = useRouter();
  const scanning = useButtplugStore((s) => s.scanning);
  const devices = useButtplugStore((s) => s.devices);
  const connectedDevices = useMemo(() => Object.values(devices), [devices]);

  const [data, setData] = useState<RecordingResponse | null>(null);
  const [showRemap, setShowRemap] = useState(false);
  const [player, setPlayer] = useState<RecordingPlayer | null>(null);
  const [playing, setPlaying] = useState(false);
  const [elapsedMs, setElapsedMs] = useState(0);

  useEffect(() => {
    fetch(`/api/recordings/${recordingId}`)
      .then((r) => r.json())
      .then(setData)
      .catch(() => toast.error("Could not load recording"));
  }, [recordingId]);

  async function handleConfirmRemap(mapping: Map<number, number>) {
    if (!data) return;
    setShowRemap(false);

    const orderedSlots = data.recording.deviceSlots.filter((s) => mapping.has(s.sourceSessionDeviceId));
    const body = {
      kind: "replay" as const,
      replayedRecordingId: data.recording.id,
      devices: orderedSlots.map((slot) => {
        const deviceIndex = mapping.get(slot.sourceSessionDeviceId)!;
        const device = connectedDevices.find((d) => d.index === deviceIndex)!;
        return { slotLabel: slot.slotLabel, bleName: device.name };
      }),
    };

    const res = await fetch("/api/play-sessions", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(body),
    });
    if (!res.ok) {
      toast.error("Could not start replay session");
      return;
    }
    const result: { session: { id: number; startedAt: number }; sessionDevices: { id: number }[] } =
      await res.json();

    eventBuffer.start(result.session.id, result.session.startedAt);
    const sessionDeviceIdToDeviceIndex = new Map<number, number>();
    orderedSlots.forEach((slot, i) => {
      const deviceIndex = mapping.get(slot.sourceSessionDeviceId)!;
      const newSessionDeviceId = result.sessionDevices[i]?.id;
      if (newSessionDeviceId !== undefined) {
        eventBuffer.registerSessionDevice(deviceIndex, newSessionDeviceId);
        sessionDeviceIdToDeviceIndex.set(slot.sourceSessionDeviceId, deviceIndex);
      }
    });

    const actuatorsByDeviceIndex = new Map<number, ActuatorInfo[]>(
      connectedDevices.map((d) => [d.index, d.actuators]),
    );

    const { runtime } = await getButtplugClientHandle();
    const instance = new RecordingPlayer({
      events: data.events,
      sessionDeviceIdToDeviceIndex,
      actuatorsByDeviceIndex,
      runtime,
      onProgress: (elapsed) => setElapsedMs(elapsed),
      onComplete: async () => {
        setPlaying(false);
        eventBuffer.stop();
        await fetch(`/api/play-sessions/${result.session.id}`, {
          method: "PATCH",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ status: "completed" }),
        });
        toast.success("Replay finished");
      },
    });
    setPlayer(instance);
    instance.play();
    setPlaying(true);
  }

  if (!data) {
    return <p className="text-sm text-muted-foreground">Loading recording...</p>;
  }

  return (
    <div className="flex flex-col gap-6">
      <Card className="bp-glass">
        <CardHeader>
          <CardTitle>{data.recording.name}</CardTitle>
        </CardHeader>
        <CardContent className="flex flex-col gap-4">
          {!player ? (
            <>
              <p className="text-sm text-muted-foreground">
                Connect the devices you want to replay onto, then match them to the recording&apos;s
                original device slots.
              </p>
              <div className="flex items-center gap-3">
                <DeviceScanPanel scanning={scanning} onScan={() => void startScanning()} onStopScan={() => void stopScanning()} />
                <Button
                  onClick={async () => {
                    await getButtplugClientHandle();
                    setShowRemap(true);
                  }}
                  disabled={connectedDevices.length === 0}
                >
                  Match devices & replay
                </Button>
              </div>
            </>
          ) : (
            <div className="flex flex-col gap-3">
              <Slider
                value={[elapsedMs]}
                max={data.recording.durationMs}
                onValueChange={([v]) => player.seek(v)}
              />
              <div className="flex items-center justify-between">
                <span className="text-xs text-muted-foreground">
                  {formatTime(elapsedMs)} / {formatTime(data.recording.durationMs)}
                </span>
                <Button
                  size="icon"
                  variant="outline"
                  onClick={() => {
                    if (playing) {
                      player.pause();
                      setPlaying(false);
                    } else {
                      player.play();
                      setPlaying(true);
                    }
                  }}
                >
                  {playing ? <Pause className="size-4" /> : <Play className="size-4" />}
                </Button>
              </div>
            </div>
          )}
        </CardContent>
      </Card>

      <DeviceRemapDialog
        open={showRemap}
        deviceSlots={data.recording.deviceSlots}
        connectedDevices={connectedDevices}
        onCancel={() => setShowRemap(false)}
        onConfirm={(mapping) => void handleConfirmRemap(mapping)}
      />

      <Button variant="ghost" size="sm" onClick={() => router.push("/recordings")}>
        Back to recordings
      </Button>
    </div>
  );
}