// js/creations/file.js

//--------------------------------------------------------------
// IMPORTS NECESSÁRIOS
//--------------------------------------------------------------
import {
  appState,
  saveStateToSession,
  resetProjectState,
  loadStateFromSession,
} from "./state.js";
import { loadAudioForTrack } from "./pattern/pattern_state.js";
import { renderAll, getSamplePathMap } from "./ui.js";
import { DEFAULT_PAN, DEFAULT_VOLUME, NOTE_LENGTH } from "./config.js";
import { initializeAudioContext, getMainGainNode } from "./audio.js";
import { DEFAULT_PROJECT_XML } from "./utils.js";
import * as Tone from "https://esm.sh/tone";
import { sendAction } from "./socket.js";

//--------------------------------------------------------------
// MANIPULAÇÃO DE ARQUIVOS
//--------------------------------------------------------------

export function handleLocalProjectReset() {
  console.log("Recebido comando de reset. Limpando estado local...");

  if (window.ROOM_NAME) {
    try {
      sessionStorage.removeItem(`temp_state_${window.ROOM_NAME}`);
    } catch (e) {
      console.error("Falha ao limpar estado da sessão:", e);
    }
  }

  resetProjectState();

  const bpmInput = document.getElementById("bpm-input");
  if (bpmInput) bpmInput.value = 140;

  ["bars-input", "compasso-a-input", "compasso-b-input"].forEach((id) => {
    const el = document.getElementById(id);
    if (el) el.value = id === "bars-input" ? 1 : 4;
  });

  renderAll();
}

export async function handleFileLoad(file) {
  let xmlContent = "";
  try {
    if (file.name.toLowerCase().endsWith(".mmpz")) {
      // eslint-disable-next-line no-undef
      const jszip = new JSZip();
      const zip = await jszip.loadAsync(file);
      const projectFile = Object.keys(zip.files).find((name) =>
        name.toLowerCase().endsWith(".mmp")
      );
      if (!projectFile)
        throw new Error(
          "Não foi possível encontrar um arquivo .mmp dentro do .mmpz"
        );
      xmlContent = await zip.files[projectFile].async("string");
    } else {
      xmlContent = await file.text();
    }

    sendAction({ type: "LOAD_PROJECT", xml: xmlContent });
  } catch (error) {
    console.error("Erro ao carregar o projeto:", error);
    alert(`Erro ao carregar projeto: ${error.message}`);
  }
}

export async function loadProjectFromServer(fileName) {
  try {
    const response = await fetch(`src_mmpSearch/mmp/${fileName}`);
    if (!response.ok)
      throw new Error(`Não foi possível carregar o arquivo ${fileName}`);

    const xmlContent = await response.text();
    sendAction({ type: "LOAD_PROJECT", xml: xmlContent });
    return true;
  } catch (error) {
    console.error("Erro ao carregar projeto do servidor:", error);
    alert(`Erro ao carregar projeto: ${error.message}`);
    return false;
  }
}

// =================================================================
// FUNÇÃO AUXILIAR: PARSE DE INSTRUMENTO ÚNICO
// =================================================================
function parseInstrumentNode(
  trackNode,
  sortedBBTrackNameNodes,
  pathMap,
  parentBasslineId = null
) {
  const instrumentNode = trackNode.querySelector("instrument");
  const instrumentTrackNode = trackNode.querySelector("instrumenttrack");

  if (!instrumentNode || !instrumentTrackNode) return null;

  const trackName = trackNode.getAttribute("name");
  const instrumentName = instrumentNode.getAttribute("name");

  // Lógica de Patterns
  const allPatternsNodeList = trackNode.querySelectorAll("pattern");
  const allPatternsArray = Array.from(allPatternsNodeList).sort((a, b) => {
    return (
      (parseInt(a.getAttribute("pos"), 10) || 0) -
      (parseInt(b.getAttribute("pos"), 10) || 0)
    );
  });

  const patternsToCreate =
    sortedBBTrackNameNodes.length > 0
      ? sortedBBTrackNameNodes
      : [{ getAttribute: () => "Pattern 1" }];

  const patterns = patternsToCreate.map((bbTrack, index) => {
    const patternNode = allPatternsArray[index];
    const bbTrackName = bbTrack.getAttribute("name") || `Pattern ${index + 1}`;

    if (!patternNode) {
      return {
        name: bbTrackName,
        steps: new Array(16).fill(false),
        notes: [],
        pos: 0,
      };
    }

    const patternSteps = parseInt(patternNode.getAttribute("steps"), 10) || 16;
    const steps = new Array(patternSteps).fill(false);
    const notes = [];

    // === CORREÇÃO MATEMÁTICA ===
    // No LMMS, 1 semínima (beat) = 192 ticks.
    // 1 semicolcheia (1/16 step) = 192 / 4 = 48 ticks.
    const ticksPerStep = 48;

    patternNode.querySelectorAll("note").forEach((noteNode) => {
      const pos = parseInt(noteNode.getAttribute("pos"), 10);
      notes.push({
        pos: pos,
        len: parseInt(noteNode.getAttribute("len"), 10),
        key: parseInt(noteNode.getAttribute("key"), 10),
        vol: parseInt(noteNode.getAttribute("vol"), 10),
        pan: parseInt(noteNode.getAttribute("pan"), 10),
      });

      // Calcula qual quadradinho acender
      const stepIndex = Math.round(pos / ticksPerStep);
      if (stepIndex < patternSteps) steps[stepIndex] = true;
    });

    return {
      name: bbTrackName,
      steps: steps,
      notes: notes,
      pos: parseInt(patternNode.getAttribute("pos"), 10) || 0,
    };
  });

  // Lógica de Sample vs Plugin
  let finalSamplePath = null;
  let trackType = "plugin";

  if (instrumentName === "audiofileprocessor") {
    trackType = "sampler";
    const afpNode = instrumentNode.querySelector("audiofileprocessor");
    const sampleSrc = afpNode ? afpNode.getAttribute("src") : null;
    if (sampleSrc) {
      const filename = sampleSrc.split("/").pop();
      if (pathMap[filename]) {
        finalSamplePath = pathMap[filename];
      } else {
        let cleanSrc = sampleSrc.startsWith("samples/")
          ? sampleSrc.substring("samples/".length)
          : sampleSrc;
        finalSamplePath = `src/samples/${cleanSrc}`;
      }
    }
  }

  const volFromFile = parseFloat(instrumentTrackNode.getAttribute("vol"));
  const panFromFile = parseFloat(instrumentTrackNode.getAttribute("pan"));

  return {
    id: Date.now() + Math.random(),
    name: trackName,
    type: trackType,
    samplePath: finalSamplePath,
    patterns: patterns,
    activePatternIndex: 0,
    volume: !isNaN(volFromFile) ? volFromFile / 100 : DEFAULT_VOLUME,
    pan: !isNaN(panFromFile) ? panFromFile / 100 : DEFAULT_PAN,
    instrumentName: instrumentName,
    instrumentXml: instrumentNode.innerHTML,
    parentBasslineId: parentBasslineId, // Guarda o ID do pai para filtragem na UI
  };
}

// =================================================================
// 🔥 FUNÇÃO DE PARSING PRINCIPAL
// =================================================================
export async function parseMmpContent(xmlString) {
  resetProjectState();
  initializeAudioContext();
  appState.global.justReset = xmlString === DEFAULT_PROJECT_XML;

  const audioContainer = document.getElementById("audio-track-container");
  if (audioContainer) {
    audioContainer.innerHTML = "";
  }

  const parser = new DOMParser();
  const xmlDoc = parser.parseFromString(xmlString, "application/xml");

  appState.global.originalXmlDoc = xmlDoc;

  // Configuração Global (BPM, Compasso)
  const head = xmlDoc.querySelector("head");
  if (head) {
    const setVal = (id, attr, def) => {
      const el = document.getElementById(id);
      if (el) el.value = head.getAttribute(attr) || def;
    };
    setVal("bpm-input", "bpm", 140);
    setVal("compasso-a-input", "timesig_numerator", 4);
    setVal("compasso-b-input", "timesig_denominator", 4);
  }

  const pathMap = getSamplePathMap();

  // 1. Identifica colunas de beat/patterns (usado para mapear steps)
  // Normalmente ficam dentro do primeiro container de Bassline
  const bbTrackNodes = Array.from(xmlDoc.querySelectorAll('track[type="1"]'));
  let sortedBBTrackNameNodes = [];
  if (bbTrackNodes.length > 0) {
    sortedBBTrackNameNodes = Array.from(
      bbTrackNodes[0].querySelectorAll("bbtco")
    ).sort((a, b) => {
      return (
        (parseInt(a.getAttribute("pos"), 10) || 0) -
        (parseInt(b.getAttribute("pos"), 10) || 0)
      );
    });
  }

  // -------------------------------------------------------------
  // 2. EXTRAÇÃO DE INSTRUMENTOS DA RAIZ (SONG EDITOR)
  // -------------------------------------------------------------
  // Pega apenas os instrumentos que estão soltos no Song Editor (não dentro de BBTracks)
  const songInstrumentNodes = Array.from(
    xmlDoc.querySelectorAll('song > trackcontainer > track[type="0"]')
  );

  const songTracks = songInstrumentNodes
    .map((node) =>
      parseInstrumentNode(node, sortedBBTrackNameNodes, pathMap, null)
    ) // null = Sem Pai
    .filter((t) => t !== null);

  // -------------------------------------------------------------
  // 3. EXTRAÇÃO DAS TRILHAS DE BASSLINE (BBTracks) E RACK COMPARTILHADO
  // -------------------------------------------------------------

  const bbRackNode = bbTrackNodes.find((n) =>
    n.querySelector('bbtrack > trackcontainer > track[type="0"]')
  );

  // ID do rack compartilhado
  const rackId = bbRackNode
    ? `bbRack_${Date.now()}_${Math.random().toString(36).slice(2)}`
    : null;

  // 3.2) Parseia instrumentos UMA vez (do rack)
  let bbRackInstruments = [];
  if (bbRackNode && rackId) {
    const internalInstrumentNodes = Array.from(
      bbRackNode.querySelectorAll('bbtrack > trackcontainer > track[type="0"]')
    );

    bbRackInstruments = internalInstrumentNodes
      .map((node) =>
        parseInstrumentNode(node, sortedBBTrackNameNodes, pathMap, rackId)
      )
      .filter((t) => t !== null);
  }

  // 3.3) Cria os containers “Caixa/Kick/…” como patterns (sem instrumentos próprios)
  const basslineContainers = bbTrackNodes
    .map((trackNode, idx) => {
      const trackName = trackNode.getAttribute("name") || "Beat/Bassline";

      const playlistClips = Array.from(
        trackNode.querySelectorAll(":scope > bbtco")
      ).map((bbtco) => ({
        pos: parseInt(bbtco.getAttribute("pos"), 10) || 0,
        len: parseInt(bbtco.getAttribute("len"), 10) || 192,
        name: trackName,
      }));

      if (playlistClips.length === 0) return null;

      return {
        id: `bassline_${Date.now()}_${Math.random().toString(36).slice(2)}`,
        name: trackName,
        type: "bassline",
        playlist_clips: playlistClips,

        // 🔥 importante: qual “coluna/pattern” este BBTrack representa
        patternIndex: idx,

        // 🔥 importante: de onde vêm os instrumentos
        instrumentSourceId: rackId,

        volume: 1,
        pan: 0,
        patterns: [],
        isMuted: trackNode.getAttribute("muted") === "1",
      };
    })
    .filter(Boolean);

  // -------------------------------------------------------------
  // 4. COMBINAÇÃO E FINALIZAÇÃO
  // -------------------------------------------------------------

  // A lista final plana contém:
  // 1) Instrumentos do Song Editor
  // 2) Instrumentos do rack compartilhado do Beat/Bassline Editor
  // 3) Containers (Caixa/Kick/...) que só referenciam o rack
  const newTracks = [
    ...songTracks,
    ...bbRackInstruments,
    ...basslineContainers,
  ];

  // Inicializa áudio apenas para instrumentos reais
  newTracks.forEach((track) => {
    if (track.type !== "bassline") {
      track.volumeNode = new Tone.Volume(Tone.gainToDb(track.volume));
      track.pannerNode = new Tone.Panner(track.pan);
      track.volumeNode.connect(track.pannerNode);
      track.pannerNode.connect(getMainGainNode());
    }
  });

  // Configura tamanho da timeline
  let isFirstTrackWithNotes = true;
  newTracks.forEach((track) => {
    if (track.type !== "bassline" && isFirstTrackWithNotes) {
      const activePattern = track.patterns[track.activePatternIndex || 0];
      if (
        activePattern &&
        activePattern.steps &&
        activePattern.steps.length > 0
      ) {
        const bars = Math.ceil(activePattern.steps.length / 16);
        const barsInput = document.getElementById("bars-input");
        if (barsInput) barsInput.value = bars > 0 ? bars : 1;
        isFirstTrackWithNotes = false;
      }
    }
  });

  // Carrega samples/plugins
  try {
    const promises = newTracks
      .filter((t) => t.type !== "bassline")
      .map((track) => loadAudioForTrack(track));
    await Promise.all(promises);
  } catch (error) {
    console.error("Erro ao carregar áudios:", error);
  }

  // Atualiza estado global
  appState.pattern.tracks = newTracks;
  appState.pattern.focusedBasslineId = null; // Reseta o foco

  const firstInst = newTracks.find((t) => t.type !== "bassline");
  appState.pattern.activeTrackId = firstInst ? firstInst.id : null;
  appState.pattern.activePatternIndex = 0;

  loadStateFromSession();

  await Promise.resolve();
  renderAll();
}

// --------------------------------------------------------------
// GERAÇÃO DE ARQUIVO (EXPORT)
// --------------------------------------------------------------

export function generateMmpFile() {
  if (appState.global.originalXmlDoc) {
    modifyAndSaveExistingMmp();
  } else {
    generateNewMmp();
  }
}

function generateXmlFromState() {
  if (!appState.global.originalXmlDoc) {
    const parser = new DOMParser();
    appState.global.originalXmlDoc = parser.parseFromString(
      DEFAULT_PROJECT_XML,
      "application/xml"
    );
  }

  const xmlDoc = appState.global.originalXmlDoc.cloneNode(true);
  const head = xmlDoc.querySelector("head");

  if (head) {
    head.setAttribute("bpm", document.getElementById("bpm-input").value || 140);
    head.setAttribute(
      "num_bars",
      document.getElementById("bars-input").value || 1
    );
    head.setAttribute(
      "timesig_numerator",
      document.getElementById("compasso-a-input").value || 4
    );
    head.setAttribute(
      "timesig_denominator",
      document.getElementById("compasso-b-input").value || 4
    );
  }

  // Exportação Simplificada: Coloca todos os instrumentos reais no primeiro container
  const bbTrackContainer = xmlDoc.querySelector(
    'track[type="1"] > bbtrack > trackcontainer'
  );
  if (bbTrackContainer) {
    bbTrackContainer
      .querySelectorAll('track[type="0"]')
      .forEach((node) => node.remove());

    const tracksXml = appState.pattern.tracks
      .filter((t) => t.type !== "bassline")
      .map((track) => createTrackXml(track))
      .join("");

    const tempDoc = new DOMParser().parseFromString(
      `<root>${tracksXml}</root>`,
      "application/xml"
    );
    Array.from(tempDoc.documentElement.children).forEach((newTrackNode) => {
      bbTrackContainer.appendChild(newTrackNode);
    });
  }

  const serializer = new XMLSerializer();
  return serializer.serializeToString(xmlDoc);
}

export function syncPatternStateToServer() {
  if (!window.ROOM_NAME) return;
  const currentXml = generateXmlFromState();
  sendAction({ type: "SYNC_PATTERN_STATE", xml: currentXml });
  saveStateToSession();
}

function createTrackXml(track) {
  if (!track.patterns || track.patterns.length === 0) return "";

  const ticksPerStep = 48; // Sincronizado com o parsing
  const lmmsVolume = Math.round(track.volume * 100);
  const lmmsPan = Math.round(track.pan * 100);

  const instrName = track.instrumentName || "kicker";
  const instrXml =
    track.instrumentXml ||
    `<kicker><env amt="0" attack="0.01" hold="0.1" decay="0.1" release="0.1" sustain="0.5" sync_mode="0"/></kicker>`;

  const patternsXml = track.patterns
    .map((pattern) => {
      let patternNotesXml = "";

      if (
        track.type === "plugin" &&
        pattern.notes &&
        pattern.notes.length > 0
      ) {
        patternNotesXml = pattern.notes
          .map(
            (note) =>
              `<note vol="${note.vol}" len="${note.len}" pos="${note.pos}" pan="${note.pan}" key="${note.key}"/>`
          )
          .join("\n                ");
      } else if (pattern.steps) {
        patternNotesXml = pattern.steps
          .map((isActive, index) => {
            if (isActive) {
              const notePos = Math.round(index * ticksPerStep);
              return `<note vol="100" len="${NOTE_LENGTH}" pos="${notePos}" pan="0" key="57"/>`;
            }
            return "";
          })
          .join("\n                ");
      }

      return `<pattern type="0" pos="${pattern.pos}" muted="0" steps="${
        pattern.steps ? pattern.steps.length : 16
      }" name="${pattern.name}">
        ${patternNotesXml}
      </pattern>`;
    })
    .join("\n      ");

  return `
    <track type="0" solo="0" muted="0" name="${track.name}">
      <instrumenttrack vol="${lmmsVolume}" pitch="0" fxch="0" pitchrange="1" basenote="57" usemasterpitch="1" pan="${lmmsPan}">
        <instrument name="${instrName}">
          ${instrXml}
        </instrument>
        <fxchain enabled="0" numofeffects="0"/>
      </instrumenttrack>
      ${patternsXml}
    </track>`;
}

function modifyAndSaveExistingMmp() {
  const content = generateXmlFromState();
  downloadFile(content, "projeto_editado.mmp");
}

function generateNewMmp() {
  const content = generateXmlFromState();
  downloadFile(content, "novo_projeto.mmp");
}

function downloadFile(content, fileName) {
  const blob = new Blob([content], { type: "application/xml;charset=utf-8" });
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  a.href = url;
  a.download = fileName;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
}

export { generateXmlFromState as generateXmlFromStateExported };