// js/main.js
import {
  appState,
  addTrackToState,
  removeLastTrackFromState,
} from "./state.js";
import {
  togglePlayback,
  stopPlayback,
  rewindPlayback,
  initializeAudioContext,
} from "./audio.js";
import { handleFileLoad, generateMmpFile } from "./file.js";
import {
  renderApp,
  redrawSequencer,
  loadAndRenderSampleBrowser,
  showOpenProjectModal,
  closeOpenProjectModal,
} from "./ui.js";
import { adjustValue, enforceNumericInput } from "./utils.js";

// --- INICIALIZAÇÃO E EVENTOS FINAIS ---
document.addEventListener("DOMContentLoaded", () => {
  const newProjectBtn = document.getElementById("new-project-btn");
  const openMmpBtn = document.getElementById("open-mmp-btn");
  const saveMmpBtn = document.getElementById("save-mmp-btn");
  const addInstrumentBtn = document.getElementById("add-instrument-btn");
  const removeInstrumentBtn = document.getElementById("remove-instrument-btn");
  const playBtn = document.getElementById("play-btn");
  const stopBtn = document.getElementById("stop-btn");
  const rewindBtn = document.getElementById("rewind-btn");
  const metronomeBtn = document.getElementById("metronome-btn");
  const mmpFileInput = document.getElementById("mmp-file-input");
  const openProjectModal = document.getElementById("open-project-modal");
  const openModalCloseBtn = document.getElementById("open-modal-close-btn");
  const loadFromComputerBtn = document.getElementById("load-from-computer-btn");
  const sidebarToggle = document.getElementById("sidebar-toggle");

  newProjectBtn.addEventListener("click", () => {
    if (
      appState.tracks.length > 0 &&
      !confirm("Você tem certeza? Alterações não salvas serão perdidas.")
    )
      return;
    Object.assign(appState, {
      tracks: [],
      isPlaying: false,
      playbackIntervalId: null,
      currentStep: 0,
      metronomeEnabled: false,
      originalXmlDoc: null,
    });
    renderApp();
  });

  openMmpBtn.addEventListener("click", showOpenProjectModal);
  loadFromComputerBtn.addEventListener("click", () => mmpFileInput.click());
  mmpFileInput.addEventListener("change", (event) => {
    const file = event.target.files[0];
    if (file) {
      handleFileLoad(file);
      closeOpenProjectModal();
    }
  });
  saveMmpBtn.addEventListener("click", generateMmpFile);
  addInstrumentBtn.addEventListener("click", addTrackToState);
  removeInstrumentBtn.addEventListener("click", removeLastTrackFromState);
  playBtn.addEventListener("click", togglePlayback);
  stopBtn.addEventListener("click", stopPlayback);
  rewindBtn.addEventListener("click", rewindPlayback);
  metronomeBtn.addEventListener("click", () => {
    initializeAudioContext();
    appState.metronomeEnabled = !appState.metronomeEnabled;
    metronomeBtn.classList.toggle("active", appState.metronomeEnabled);
  });
  openModalCloseBtn.addEventListener("click", closeOpenProjectModal);
  openProjectModal.addEventListener("click", (e) => {
    if (e.target === openProjectModal) closeOpenProjectModal();
  });
  sidebarToggle.addEventListener("click", () => {
    document.body.classList.toggle("sidebar-hidden");
    const icon = sidebarToggle.querySelector("i");
    icon.className = document.body.classList.contains("sidebar-hidden")
      ? "fa-solid fa-caret-right"
      : "fa-solid fa-caret-left";
  });

  const inputs = document.querySelectorAll(".value-input");
  inputs.forEach((input) => {
    input.addEventListener("input", (event) => {
      enforceNumericInput(event);
      if (appState.isPlaying && event.target.id.startsWith("compasso-")) {
        stopPlayback();
      }
      if (event.target.id.startsWith("compasso-")) {
        redrawSequencer();
      }
    });
    input.addEventListener("wheel", (event) => {
      event.preventDefault();
      const step = event.deltaY < 0 ? 1 : -1;
      adjustValue(event.target, step);
    });
  });

  const buttons = document.querySelectorAll(".adjust-btn");
  buttons.forEach((button) => {
    button.addEventListener("click", () => {
      const targetId = button.dataset.target + "-input";
      const targetInput = document.getElementById(targetId);
      if (targetInput) {
        adjustValue(targetInput, step);
      }
    });
  });

  // Inicia a aplicação
  loadAndRenderSampleBrowser();
  renderApp();
});