// js/proa.js - Lógica para el visor de Guías PROA (v14 - Rutas corregidas)
// ======================================================================
// BLOCK START: DOM Elements Selection & Initial Setup
// ======================================================================
console.log("[proa.js v14] Script cargado. Esperando DOMContentLoaded...");
window.addEventListener('DOMContentLoaded', () => {
  console.log("[proa.js v14] DOMContentLoaded detectado. Iniciando setup...");

  // Selectores y Contenedores
  const guideSelector = document.getElementById('guideSelector');
  const diagnosisSelectorContainer = document.getElementById('diagnosis-selector-container');
  const diagnosisSelector = document.getElementById('diagnosisSelector');
  const guideContentDisplay = document.getElementById('guide-content-display');
  const togglePediatricCheckbox = document.getElementById('togglePediatric');

  // Ruta al JSON
  const guidesDataUrl = './data/guides_data.json'; // Mantenemos ./ aquí, ya que funciona

  // Verificar elementos críticos
  if (!guideSelector || !diagnosisSelectorContainer || !diagnosisSelector || !guideContentDisplay || !togglePediatricCheckbox) {
    console.error("[proa.js v14] Error Crítico: No se encontraron elementos DOM esenciales.");
    guideContentDisplay.innerHTML = '<p class="text-red-500 font-semibold text-center py-10">Error: Interfaz no inicializada correctamente.</p>';
    return;
  }
  console.log("[proa.js v14] Elementos DOM encontrados.");
  // ======================================================================
  // BLOCK END: DOM Elements Selection & Initial Setup
  // ======================================================================

  // ======================================================================
  // BLOCK START: State Variables
  // ======================================================================
  let allGuides = [];
  let currentSelectedGuideData = null;
  let currentGuideHTMLContent = null;
  // ======================================================================
  // BLOCK END: State Variables
  // ======================================================================

  // ======================================================================
  // BLOCK START: Function to Fetch Guides Data (from JSON)
  // ======================================================================
  async function loadGuidesData() {
    console.log(`[proa.js v14] Iniciando loadGuidesData desde: ${guidesDataUrl}`);
    guideSelector.innerHTML = '<option value="">Cargando...</option>';
    guideSelector.disabled = true;
    resetUI();

    try {
      console.log("[proa.js v14] Realizando fetch...");
      const response = await fetch(guidesDataUrl);
      console.log(`[proa.js v14] Fetch completado. Status: ${response.status}`);
      if (!response.ok) throw new Error(`Error HTTP ${response.status} al cargar ${guidesDataUrl}. Verifica que el archivo exista y sea accesible.`);

      console.log("[proa.js v14] Parseando JSON...");
      const rawData = await response.json();
      console.log("[proa.js v14] JSON parseado.");

      if (!Array.isArray(rawData)) throw new Error("El formato del JSON no es un array válido.");

      allGuides = rawData.filter(g => g.id && g.title && g.file && typeof g.isPediatric === 'boolean');
      console.log(`[proa.js v14] Guías válidas iniciales: ${allGuides.length}`);

      allGuides = allGuides.map(g => {
        if (g.hasDiagnoses === true) {
          if (!Array.isArray(g.diagnoses) || g.diagnoses.some(d => !d.id || !d.title)) {
            console.warn(`[proa.js v14] Guía '${g.title}' marcada con 'hasDiagnoses' pero la estructura 'diagnoses' es inválida. Se tratará como guía normal.`);
            return { ...g, hasDiagnoses: false, diagnoses: undefined };
          }
        }
        return g;
      });

      if (allGuides.length === 0) throw new Error("No se encontraron guías válidas en los datos después de la validación.");

      allGuides.sort((a, b) => a.title.localeCompare(b.title));

      console.log("[proa.js v14] Llamando a populateGuideSelector (mostrará Adultos por defecto)...");
      populateGuideSelector();
      guideSelector.disabled = false;
      console.log("[proa.js v14] Carga inicial de datos completada.");

    } catch (error) {
      console.error("[proa.js v14] Error durante loadGuidesData:", error);
      guideSelector.innerHTML = `<option value="">Error al cargar</option>`;
      guideSelector.disabled = true;
      guideContentDisplay.innerHTML = `<p class="text-red-600 font-semibold text-center py-10">Error crítico al cargar datos: ${error.message}. Revisa la consola y el archivo '${guidesDataUrl}'.</p>`;
    }
  }
  // ======================================================================
  // BLOCK END: Function to Fetch Guides Data (from JSON)
  // ======================================================================

  // ======================================================================
  // BLOCK START: UI Update Functions
  // ======================================================================

  function resetUI(fullReset = true) {
       guideContentDisplay.innerHTML = '<div class="text-center py-16 text-gray-400"><i class="fas fa-file-alt text-5xl mb-4"></i><p>Selecciona una guía del desplegable.</p></div>';
       diagnosisSelector.innerHTML = '<option value="">-- Seleccione Diagnóstico --</option>';
       diagnosisSelectorContainer.classList.add('hidden');
       currentSelectedGuideData = null;
       currentGuideHTMLContent = null;

       if(fullReset && guideSelector.options.length > 1) {
           guideSelector.value = "";
       }
  }

  function populateGuideSelector() {
      const showOnlyPediatric = togglePediatricCheckbox.checked;
      console.log(`[proa.js v14] Poblando selector principal. Mostrar Pediátricas: ${showOnlyPediatric}`);

      const filteredGuides = allGuides.filter(guide => guide.isPediatric === showOnlyPediatric);
      filteredGuides.sort((a, b) => a.title.localeCompare(b.title));

      guideSelector.innerHTML = `<option value="">-- Seleccione Guía (${showOnlyPediatric ? 'Pediátricas' : 'Adultos'}) --</option>`;

      if (filteredGuides.length > 0) {
          const fragment = document.createDocumentFragment();
          filteredGuides.forEach(guide => {
              const option = document.createElement('option');
              option.value = guide.id;
              option.textContent = guide.isPediatric ? `${guide.title} (PED)` : guide.title;
              option.dataset.hasDiagnoses = guide.hasDiagnoses || false;
              option.dataset.file = guide.file;
              fragment.appendChild(option);
          });
          guideSelector.appendChild(fragment);
          console.log(`[proa.js v14] Selector principal poblado con ${filteredGuides.length} guías.`);
      } else {
          guideSelector.innerHTML = `<option value="">-- No hay guías ${showOnlyPediatric ? 'Pediátricas' : 'Adultos'} --</option>`;
          console.log(`[proa.js v14] No se encontraron guías para el filtro actual.`);
      }
      resetUI(false);
  }

  function populateDiagnosisSelector(guideData) {
    console.log(`[proa.js v14] Poblando selector de diagnósticos para: ${guideData.title}`);
    diagnosisSelector.innerHTML = '<option value="">-- Seleccione Diagnóstico --</option>';

    if (guideData.hasDiagnoses && Array.isArray(guideData.diagnoses)) {
      const fragment = document.createDocumentFragment();
      guideData.diagnoses.forEach(diagnosis => {
        const option = document.createElement('option');
        option.value = diagnosis.id;
        option.textContent = diagnosis.title;
        fragment.appendChild(option);
      });
      diagnosisSelector.appendChild(fragment);
      diagnosisSelectorContainer.classList.remove('hidden');
      console.log(`[proa.js v14] Selector de diagnósticos poblado con ${guideData.diagnoses.length} opciones.`);
    } else {
      console.warn("[proa.js v14] Se intentó poblar diagnósticos para una guía sin ellos o con datos inválidos.");
      diagnosisSelectorContainer.classList.add('hidden');
    }
  }
  // ======================================================================
  // BLOCK END: UI Update Functions
  // ======================================================================

  // ======================================================================
  // BLOCK START: Content Loading Functions
  // ======================================================================

  async function loadFullGuideContent(guideFile) {
    if (!guideFile) {
      resetUI();
      return;
    }
    // ! RUTA CORREGIDA: Sin ./ !
    const guideUrl = guideFile; // Asume que la ruta en JSON (ej. "guias/archivo.html") es relativa a la raíz
    console.log(`[proa.js v14] Solicitando contenido COMPLETO de: ${guideUrl}`);
    guideContentDisplay.innerHTML = '<div class="text-center py-20"><i class="fas fa-spinner fa-spin text-3xl text-gray-400"></i><p class="mt-2 text-gray-500">Cargando guía completa...</p></div>';
    currentGuideHTMLContent = null;

    try {
      const response = await fetch(guideUrl);
      if (!response.ok) throw new Error(`Error HTTP ${response.status} al cargar ${guideUrl}`);
      const htmlText = await response.text();

      const parser = new DOMParser();
      const doc = parser.parseFromString(htmlText, 'text/html');
      // Intenta buscar el primer div con clase treatment-card como contenedor principal
      const contentNode = doc.querySelector('.treatment-card') || doc.body;

      if (contentNode) {
        const clonedContent = contentNode.cloneNode(true);
        const scripts = clonedContent.querySelectorAll('script');
        scripts.forEach(script => script.remove());
        if (scripts.length > 0) console.log(`[proa.js v14] Eliminados ${scripts.length} script(s) de ${guideUrl}.`);

        guideContentDisplay.innerHTML = '';
        guideContentDisplay.appendChild(clonedContent);
        console.log(`[proa.js v14] Contenido COMPLETO de ${guideUrl} mostrado.`);
        guideContentDisplay.scrollTop = 0;
      } else {
        // Si no encuentra .treatment-card, intenta mostrar el body entero (menos scripts)
        const bodyNode = doc.body;
        if(bodyNode){
           const clonedBody = bodyNode.cloneNode(true);
           const scripts = clonedBody.querySelectorAll('script');
           scripts.forEach(script => script.remove());
           guideContentDisplay.innerHTML = '';
           guideContentDisplay.appendChild(clonedBody);
           console.warn(`[proa.js v14] No se encontró .treatment-card en '${guideUrl}'. Mostrando contenido del body.`);
           guideContentDisplay.scrollTop = 0;
        } else {
           throw new Error(`No se encontró nodo de contenido principal (ni .treatment-card ni body) en '${guideUrl}'.`);
        }
      }
    } catch (error) {
      console.error(`[proa.js v14] Error al cargar/mostrar contenido COMPLETO de ${guideUrl}:`, error);
      guideContentDisplay.innerHTML = `<div class="text-center py-20 text-red-600">Error al cargar contenido: ${error.message}</div>`;
    }
  }

  async function loadAndDisplayDiagnosisContent(guideData, diagnosisId) {
    // ! RUTA CORREGIDA: Sin ./ !
    const guideFileUrl = guideData.file; // Asume que la ruta en JSON es relativa a la raíz
    console.log(`[proa.js v14] Solicitando diagnóstico '${diagnosisId}' de la guía '${guideData.title}' (${guideFileUrl})`);
    guideContentDisplay.innerHTML = '<div class="text-center py-20"><i class="fas fa-spinner fa-spin text-3xl text-gray-400"></i><p class="mt-2 text-gray-500">Cargando diagnóstico...</p></div>';

    try {
      if (!currentGuideHTMLContent) {
        console.log(`[proa.js v14] HTML de ${guideFileUrl} no cacheado. Realizando fetch...`);
        const response = await fetch(guideFileUrl);
        if (!response.ok) throw new Error(`Error HTTP ${response.status} al cargar ${guideFileUrl}`);
        currentGuideHTMLContent = await response.text();
        console.log(`[proa.js v14] HTML de ${guideFileUrl} cargado y cacheado.`);
      } else {
         console.log(`[proa.js v14] Usando HTML cacheado de ${guideFileUrl}.`);
      }

      const parser = new DOMParser();
      const doc = parser.parseFromString(currentGuideHTMLContent, 'text/html');
      const diagnosisNode = doc.getElementById(diagnosisId);

      if (diagnosisNode) {
        console.log(`[proa.js v14] Nodo para diagnóstico ID '${diagnosisId}' encontrado.`);
        const clonedDiagnosisContent = diagnosisNode.cloneNode(true);
        const scripts = clonedDiagnosisContent.querySelectorAll('script');
        scripts.forEach(script => script.remove());
         if (scripts.length > 0) console.log(`[proa.js v14] Eliminados ${scripts.length} script(s) del nodo de diagnóstico.`);

        guideContentDisplay.innerHTML = '';
        guideContentDisplay.appendChild(clonedDiagnosisContent);
        console.log(`[proa.js v14] Contenido del diagnóstico '${diagnosisId}' mostrado.`);
        guideContentDisplay.scrollTop = 0;
      } else {
        throw new Error(`No se encontró el elemento con ID '${diagnosisId}' dentro de '${guideFileUrl}'. Verifica la estructura del HTML de la guía.`);
      }
    } catch (error) {
      console.error(`[proa.js v14] Error al cargar/mostrar diagnóstico '${diagnosisId}' de ${guideFileUrl}:`, error);
      guideContentDisplay.innerHTML = `<div class="text-center py-20 text-red-600">Error al cargar diagnóstico: ${error.message}</div>`;
    }
  }
  // ======================================================================
  // BLOCK END: Content Loading Functions
  // ======================================================================

  // ======================================================================
  // BLOCK START: Event Listeners Setup
  // ======================================================================

  guideSelector.addEventListener('change', (event) => {
    const selectedOption = event.target.selectedOptions[0];
    const guideId = selectedOption.value;
    console.log(`[proa.js v14] Cambió la guía principal seleccionada. ID: ${guideId}`);
    resetUI(false);

    if (!guideId) {
      return;
    }

    currentSelectedGuideData = allGuides.find(g => g.id === guideId);

    if (!currentSelectedGuideData) {
        console.error(`[proa.js v14] No se encontraron datos para la guía con ID: ${guideId}`);
        guideContentDisplay.innerHTML = '<p class="text-red-500 text-center py-10">Error: Datos de guía no encontrados.</p>';
        return;
    }

    if (currentSelectedGuideData.hasDiagnoses === true) {
        console.log(`[proa.js v14] La guía '${currentSelectedGuideData.title}' tiene diagnósticos. Poblando selector secundario.`);
        populateDiagnosisSelector(currentSelectedGuideData);
        guideContentDisplay.innerHTML = '<div class="text-center py-16 text-gray-400"><i class="fas fa-stethoscope text-5xl mb-4"></i><p>Selecciona un diagnóstico específico del desplegable superior.</p></div>';
    } else {
        console.log(`[proa.js v14] La guía '${currentSelectedGuideData.title}' no tiene diagnósticos. Cargando contenido completo.`);
        diagnosisSelectorContainer.classList.add('hidden');
        loadFullGuideContent(currentSelectedGuideData.file);
    }
  });

  diagnosisSelector.addEventListener('change', (event) => {
    const diagnosisId = event.target.value;
    console.log(`[proa.js v14] Cambió el diagnóstico seleccionado. ID: ${diagnosisId}`);

    if (!diagnosisId) {
      guideContentDisplay.innerHTML = '<div class="text-center py-16 text-gray-400"><i class="fas fa-stethoscope text-5xl mb-4"></i><p>Selecciona un diagnóstico específico del desplegable superior.</p></div>';
      return;
    }

    if (currentSelectedGuideData && currentSelectedGuideData.hasDiagnoses) {
      loadAndDisplayDiagnosisContent(currentSelectedGuideData, diagnosisId);
    } else {
      console.error("[proa.js v14] Se intentó cargar un diagnóstico pero no hay guía con diagnósticos seleccionada.");
       guideContentDisplay.innerHTML = '<p class="text-red-500 text-center py-10">Error: Guía base no seleccionada correctamente.</p>';
    }
  });

  togglePediatricCheckbox.addEventListener('change', () => {
      console.log('[proa.js v14] Cambiado filtro pediátrico.');
      populateGuideSelector();
  });

  console.log("[proa.js v14] Listeners añadidos.");
  // ======================================================================
  // BLOCK END: Event Listeners Setup
  // ======================================================================

  // ======================================================================
  // BLOCK START: Initial Execution
  // ======================================================================
  loadGuidesData();
  // ======================================================================
  // BLOCK END: Initial Execution
  // ======================================================================

}); // Fin DOMContentLoaded
console.log("[proa.js v14] Script completamente definido.");