import { ref, nextTick } from "vue";
import {
  UpdateCommunicationTranscriptMutationDocument,
  CommunicationsQueryDocument,
} from "~~/graphql/generated";
import { useMutation } from "@vue/apollo-composable";
import { isVoiceCaptureSupported, transcribeAudioBlob } from "~/composables/useVoiceTranscription";

import type { CommItem } from "~/composables/useContacts";

export function useCallAudio() {
  // ---------------------------------------------------------------------------
  // State
  // ---------------------------------------------------------------------------
  const commCallWaveHosts = new Map<string, HTMLDivElement>();
  const commCallWaveSurfers = new Map<string, any>();
  const commCallPlayableById = ref<Record<string, boolean>>({});
  const commCallPlayingById = ref<Record<string, boolean>>({});
  const callTranscriptOpen = ref<Record<string, boolean>>({});
  const callTranscriptLoading = ref<Record<string, boolean>>({});
  const callTranscriptText = ref<Record<string, string>>({});
  const callTranscriptError = ref<Record<string, string>>({});

  // Event archive recording state
  const eventArchiveRecordingById = ref<Record<string, boolean>>({});
  const eventArchiveTranscribingById = ref<Record<string, boolean>>({});
  const eventArchiveMicErrorById = ref<Record<string, string>>({});
  let eventArchiveMediaRecorder: MediaRecorder | null = null;
  let eventArchiveRecorderStream: MediaStream | null = null;
  let eventArchiveRecorderMimeType = "audio/webm";
  let eventArchiveChunks: Blob[] = [];
  let eventArchiveTargetEventId = "";

  // WaveSurfer module cache
  let waveSurferModulesPromise: Promise<{ WaveSurfer: any; RecordPlugin: any }> | null = null;

  // ---------------------------------------------------------------------------
  // Apollo Mutation
  // ---------------------------------------------------------------------------
  const { mutate: doUpdateCommunicationTranscript } = useMutation(UpdateCommunicationTranscriptMutationDocument, {
    refetchQueries: [{ query: CommunicationsQueryDocument }],
  });

  // ---------------------------------------------------------------------------
  // WaveSurfer lazy loading
  // ---------------------------------------------------------------------------
  async function loadWaveSurferModules() {
    if (!waveSurferModulesPromise) {
      waveSurferModulesPromise = Promise.all([
        import("wavesurfer.js"),
        import("wavesurfer.js/dist/plugins/record.esm.js"),
      ]).then(([ws, rec]) => ({
        WaveSurfer: ws.default,
        RecordPlugin: rec.default,
      }));
    }
    return waveSurferModulesPromise;
  }

  // ---------------------------------------------------------------------------
  // Call wave helpers
  // ---------------------------------------------------------------------------
  function setCommCallPlaying(itemId: string, value: boolean) {
    commCallPlayingById.value = {
      ...commCallPlayingById.value,
      [itemId]: value,
    };
  }

  function isCommCallPlaying(itemId: string) {
    return Boolean(commCallPlayingById.value[itemId]);
  }

  function getCallAudioUrl(item?: CommItem) {
    return String(item?.audioUrl ?? "").trim();
  }

  function isCommCallPlayable(item: CommItem) {
    const known = commCallPlayableById.value[item.id];
    if (typeof known === "boolean") return known;
    return Boolean(getCallAudioUrl(item));
  }

  function pauseOtherCommCallWaves(currentItemId: string) {
    for (const [itemId, ws] of commCallWaveSurfers.entries()) {
      if (itemId === currentItemId) continue;
      ws.pause?.();
      setCommCallPlaying(itemId, false);
    }
  }

  function parseDurationToSeconds(raw?: string) {
    if (!raw) return 0;
    const text = raw.trim().toLowerCase();
    if (!text) return 0;

    const ms = text.match(/(\d+)\s*m(?:in)?\s*(\d+)?\s*s?/);
    if (ms) {
      const m = Number(ms[1] ?? 0);
      const s = Number(ms[2] ?? 0);
      return m * 60 + s;
    }
    const colon = text.match(/(\d+):(\d+)/);
    if (colon) {
      return Number(colon[1] ?? 0) * 60 + Number(colon[2] ?? 0);
    }
    const sec = text.match(/(\d+)\s*s/);
    if (sec) return Number(sec[1] ?? 0);
    return 0;
  }

  function buildCallWavePeaks(item: CommItem, size = 320) {
    const stored = Array.isArray(item.waveform)
      ? item.waveform.map((value) => Number(value)).filter((value) => Number.isFinite(value) && value > 0)
      : [];
    if (stored.length) {
      const sampled = new Float32Array(size);
      for (let i = 0; i < size; i += 1) {
        const t = size <= 1 ? 0 : i / (size - 1);
        const idx = Math.min(stored.length - 1, Math.round(t * (stored.length - 1)));
        sampled[i] = Math.max(0.05, Math.min(1, stored[idx] ?? 0.05));
      }
      return sampled;
    }

    const source = `${item.text} ${(item.transcript ?? []).join(" ")}`.trim() || item.contact;
    let seed = 0;
    for (let i = 0; i < source.length; i += 1) {
      seed = (seed * 31 + source.charCodeAt(i)) >>> 0;
    }
    const rand = () => {
      seed = (seed * 1664525 + 1013904223) >>> 0;
      return seed / 0xffffffff;
    };

    const out = new Float32Array(size);
    let smooth = 0;
    for (let i = 0; i < size; i += 1) {
      const t = i / Math.max(1, size - 1);
      const burst = Math.max(0, Math.sin(t * Math.PI * (3 + (source.length % 7))));
      const noise = (rand() * 2 - 1) * 0.65;
      smooth = smooth * 0.7 + noise * 0.3;
      out[i] = Math.max(0.05, Math.min(1, 0.12 + Math.abs(smooth) * 0.48 + burst * 0.4));
    }
    return out;
  }

  function destroyCommCallWave(itemId: string) {
    const ws = commCallWaveSurfers.get(itemId);
    if (!ws) return;
    ws.destroy();
    commCallWaveSurfers.delete(itemId);
    const nextPlayable = { ...commCallPlayableById.value };
    delete nextPlayable[itemId];
    commCallPlayableById.value = nextPlayable;
    const nextPlaying = { ...commCallPlayingById.value };
    delete nextPlaying[itemId];
    commCallPlayingById.value = nextPlaying;
  }

  function destroyAllCommCallWaves() {
    for (const itemId of commCallWaveSurfers.keys()) {
      destroyCommCallWave(itemId);
    }
    commCallWaveHosts.clear();
  }

  async function ensureCommCallWave(itemId: string, callItem?: CommItem) {
    const host = commCallWaveHosts.get(itemId);
    if (!host) return;
    if (commCallWaveSurfers.has(itemId)) return;

    if (!callItem) return;

    const { WaveSurfer } = await loadWaveSurferModules();
    const durationSeconds =
      parseDurationToSeconds(callItem.duration) ||
      Math.max(8, Math.min(120, Math.round(((callItem.transcript ?? []).join(" ").length || callItem.text.length) / 10)));
    const peaks = buildCallWavePeaks(callItem, 360);
    const audioUrl = getCallAudioUrl(callItem);

    const ws = WaveSurfer.create({
      container: host,
      height: 30,
      waveColor: "rgba(180, 206, 255, 0.88)",
      progressColor: "rgba(118, 157, 248, 0.95)",
      cursorWidth: 0,
      interact: Boolean(audioUrl),
      normalize: true,
      barWidth: 0,
    });

    ws.on("play", () => setCommCallPlaying(itemId, true));
    ws.on("pause", () => setCommCallPlaying(itemId, false));
    ws.on("finish", () => setCommCallPlaying(itemId, false));

    let playable = false;
    if (audioUrl) {
      try {
        await ws.load(audioUrl, [peaks], durationSeconds);
        playable = true;
      } catch {
        await ws.load("", [peaks], durationSeconds);
        playable = false;
      }
    } else {
      await ws.load("", [peaks], durationSeconds);
    }

    commCallPlayableById.value = {
      ...commCallPlayableById.value,
      [itemId]: playable,
    };
    commCallWaveSurfers.set(itemId, ws);
  }

  async function syncCommCallWaves(activeCallIds: Set<string>, getCallItem: (id: string) => CommItem | undefined) {
    await nextTick();

    for (const id of commCallWaveSurfers.keys()) {
      if (!activeCallIds.has(id) || !commCallWaveHosts.has(id)) {
        destroyCommCallWave(id);
      }
    }

    for (const id of activeCallIds) {
      if (commCallWaveHosts.has(id)) {
        await ensureCommCallWave(id, getCallItem(id));
      }
    }
  }

  function setCommCallWaveHost(itemId: string, element: Element | null) {
    if (!(element instanceof HTMLDivElement)) {
      commCallWaveHosts.delete(itemId);
      destroyCommCallWave(itemId);
      return;
    }
    commCallWaveHosts.set(itemId, element);
  }

  // ---------------------------------------------------------------------------
  // Call playback toggle
  // ---------------------------------------------------------------------------
  async function toggleCommCallPlayback(item: CommItem) {
    if (!isCommCallPlayable(item)) return;
    const itemId = item.id;
    await ensureCommCallWave(itemId, item);
    const ws = commCallWaveSurfers.get(itemId);
    if (!ws) return;
    if (isCommCallPlaying(itemId)) {
      ws.pause?.();
      return;
    }
    pauseOtherCommCallWaves(itemId);
    await ws.play?.();
  }

  // ---------------------------------------------------------------------------
  // Call transcription
  // ---------------------------------------------------------------------------
  async function transcribeCallItem(item: CommItem) {
    const itemId = item.id;
    if (callTranscriptLoading.value[itemId]) return;
    if (callTranscriptText.value[itemId]) return;
    if (Array.isArray(item.transcript) && item.transcript.length) {
      const persisted = item.transcript.map((line) => String(line ?? "").trim()).filter(Boolean).join("\n");
      if (persisted) {
        callTranscriptText.value[itemId] = persisted;
        return;
      }
    }

    const audioUrl = getCallAudioUrl(item);
    if (!audioUrl) {
      callTranscriptError.value[itemId] = "Audio source is missing";
      return;
    }

    callTranscriptLoading.value[itemId] = true;
    callTranscriptError.value[itemId] = "";
    try {
      const audioBlob = await fetch(audioUrl).then((res) => {
        if (!res.ok) throw new Error(`Audio fetch failed: ${res.status}`);
        return res.blob();
      });
      const text = await transcribeAudioBlob(audioBlob);
      callTranscriptText.value[itemId] = text || "(empty transcript)";
      await doUpdateCommunicationTranscript({ id: itemId, transcript: text ? [text] : [] });
    } catch (error: any) {
      callTranscriptError.value[itemId] = String(error?.message ?? error ?? "Transcription failed");
    } finally {
      callTranscriptLoading.value[itemId] = false;
    }
  }

  function toggleCallTranscript(item: CommItem) {
    const itemId = item.id;
    const next = !callTranscriptOpen.value[itemId];
    callTranscriptOpen.value[itemId] = next;
    if (next) {
      void transcribeCallItem(item);
    }
  }

  function isCallTranscriptOpen(itemId: string) {
    return Boolean(callTranscriptOpen.value[itemId]);
  }

  // ---------------------------------------------------------------------------
  // Event archive recording
  // ---------------------------------------------------------------------------
  function isEventArchiveRecording(eventId: string) {
    return Boolean(eventArchiveRecordingById.value[eventId]);
  }

  function isEventArchiveTranscribing(eventId: string) {
    return Boolean(eventArchiveTranscribingById.value[eventId]);
  }

  async function startEventArchiveRecording(
    eventId: string,
    opts: {
      pilotMicSupported: { value: boolean };
      eventCloseDraft: { value: Record<string, string> };
    },
  ) {
    if (eventArchiveMediaRecorder || isEventArchiveTranscribing(eventId)) return;
    eventArchiveMicErrorById.value = { ...eventArchiveMicErrorById.value, [eventId]: "" };
    try {
      const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
      const preferredMime = "audio/webm;codecs=opus";
      const recorder = MediaRecorder.isTypeSupported(preferredMime)
        ? new MediaRecorder(stream, { mimeType: preferredMime })
        : new MediaRecorder(stream);

      eventArchiveRecorderStream = stream;
      eventArchiveRecorderMimeType = recorder.mimeType || "audio/webm";
      eventArchiveMediaRecorder = recorder;
      eventArchiveChunks = [];
      eventArchiveTargetEventId = eventId;
      eventArchiveRecordingById.value = { ...eventArchiveRecordingById.value, [eventId]: true };

      recorder.ondataavailable = (event: BlobEvent) => {
        if (event.data?.size) eventArchiveChunks.push(event.data);
      };

      recorder.onstop = async () => {
        const targetId = eventArchiveTargetEventId;
        eventArchiveRecordingById.value = { ...eventArchiveRecordingById.value, [targetId]: false };
        eventArchiveMediaRecorder = null;
        eventArchiveTargetEventId = "";
        if (eventArchiveRecorderStream) {
          eventArchiveRecorderStream.getTracks().forEach((track) => track.stop());
          eventArchiveRecorderStream = null;
        }

        const audioBlob = new Blob(eventArchiveChunks, { type: eventArchiveRecorderMimeType });
        eventArchiveChunks = [];
        if (!targetId || audioBlob.size === 0) return;
        eventArchiveTranscribingById.value = { ...eventArchiveTranscribingById.value, [targetId]: true };
        try {
          const text = await transcribeAudioBlob(audioBlob);
          if (!text) {
            eventArchiveMicErrorById.value = { ...eventArchiveMicErrorById.value, [targetId]: "Could not recognize speech" };
            return;
          }
          const previous = String(opts.eventCloseDraft.value[targetId] ?? "").trim();
          const merged = previous ? `${previous} ${text}` : text;
          opts.eventCloseDraft.value = { ...opts.eventCloseDraft.value, [targetId]: merged };
        } catch (error: any) {
          eventArchiveMicErrorById.value = {
            ...eventArchiveMicErrorById.value,
            [targetId]: String(error?.data?.message ?? error?.message ?? "Voice transcription failed"),
          };
        } finally {
          eventArchiveTranscribingById.value = { ...eventArchiveTranscribingById.value, [targetId]: false };
        }
      };

      recorder.start();
    } catch {
      eventArchiveMicErrorById.value = { ...eventArchiveMicErrorById.value, [eventId]: "No microphone access" };
    }
  }

  function stopEventArchiveRecording() {
    if (!eventArchiveMediaRecorder || eventArchiveMediaRecorder.state === "inactive") return;
    eventArchiveMediaRecorder.stop();
  }

  function toggleEventArchiveRecording(
    eventId: string,
    opts: {
      pilotMicSupported: { value: boolean };
      eventCloseDraft: { value: Record<string, string> };
    },
  ) {
    if (!opts.pilotMicSupported.value) {
      eventArchiveMicErrorById.value = { ...eventArchiveMicErrorById.value, [eventId]: "Recording is not supported in this browser" };
      return;
    }
    if (isEventArchiveRecording(eventId)) {
      stopEventArchiveRecording();
      return;
    }
    void startEventArchiveRecording(eventId, opts);
  }

  // ---------------------------------------------------------------------------
  // Public API
  // ---------------------------------------------------------------------------
  return {
    commCallWaveHosts,
    commCallPlayableById,
    commCallPlayingById,
    callTranscriptOpen,
    callTranscriptLoading,
    callTranscriptText,
    callTranscriptError,
    ensureCommCallWave,
    destroyCommCallWave,
    destroyAllCommCallWaves,
    toggleCommCallPlayback,
    syncCommCallWaves,
    transcribeCallItem,
    toggleCallTranscript,
    isCallTranscriptOpen,
    eventArchiveRecordingById,
    eventArchiveTranscribingById,
    eventArchiveMicErrorById,
    startEventArchiveRecording,
    stopEventArchiveRecording,
    toggleEventArchiveRecording,
    isCommCallPlayable,
    isCommCallPlaying,
    setCommCallWaveHost,
  };
}