/**
 * Sistema de modales centralizado para reemplazar alert() nativos
 * Uso:
 *   import { modal } from './lib/modal.js';
 *   modal.success("Guardado correctamente");
 *   modal.error("Error: " + e.message);
 *   modal.info("Información importante");
 *   modal.warn("Advertencia");
 *   const ok = await modal.confirm("¿Estás seguro?");
 */

const STYLES = `
  .modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(2px);
    display: flex; align-items: center; justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.15s ease-out;
    font-family: var(--font-sans, system-ui);
  }
  @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
  @keyframes slideIn {
    from { transform: translateY(-12px); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
  }
  .modal-box {
    background: var(--panel, #ffffff);
    border-radius: var(--r-lg, 12px);
    padding: 24px;
    min-width: 320px;
    max-width: 480px;
    box-shadow: var(--shadow-lg, 0 12px 28px rgba(15,23,42,.10));
    border: 1px solid var(--border, #e2e8f0);
    animation: slideIn 0.2s ease-out;
  }
  .modal-header {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 14px;
  }
  .modal-icon {
    width: 32px; height: 32px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; font-weight: 700;
    flex-shrink: 0;
  }
  .modal-icon.success { background: var(--ok-soft, #d1fae5);   color: var(--ok, #10b981); }
  .modal-icon.error   { background: var(--err-soft, #fee2e2);  color: var(--err, #ef4444); }
  .modal-icon.warn    { background: var(--warn-soft, #fef3c7); color: var(--warn, #f59e0b); }
  .modal-icon.info    { background: var(--accent-soft, #e0f2fe); color: var(--accent, #0ea5e9); }
  .modal-icon.confirm { background: var(--accent-soft, #e0f2fe); color: var(--accent-hover, #0284c7); }
  .modal-title {
    font-size: 16px; font-weight: 600;
    color: var(--text, #0f172a);
    margin: 0;
    letter-spacing: -0.01em;
  }
  .modal-message {
    color: var(--text-dim, #475569);
    font-size: 14px; line-height: 1.5;
    margin-bottom: 20px;
    word-break: break-word;
  }
  .modal-buttons {
    display: flex; gap: 8px; justify-content: flex-end;
  }
  .modal-btn {
    padding: 8px 16px;
    border-radius: var(--r-md, 10px);
    font-size: 13px; font-weight: 500;
    cursor: pointer; border: 1px solid transparent;
    transition: all 0.15s;
    font-family: inherit;
  }
  .modal-btn:focus-visible { outline: none; box-shadow: var(--focus-ring, 0 0 0 3px rgba(14,165,233,.3)); }
  .modal-btn.primary {
    background: var(--accent, #0ea5e9); color: var(--text-on-acc, #fff);
  }
  .modal-btn.primary:hover { background: var(--accent-hover, #0284c7); }
  .modal-btn.secondary {
    background: var(--panel, #fff); color: var(--text, #0f172a);
    border-color: var(--border-hi, #cbd5e1);
  }
  .modal-btn.secondary:hover { border-color: var(--accent, #0ea5e9); color: var(--accent-hover, #0284c7); }
  .modal-btn.danger {
    background: var(--err, #ef4444); color: #fff;
  }
  .modal-btn.danger:hover { filter: brightness(0.95); }
`;

// Inyectar estilos una sola vez
let stylesInjected = false;
function injectStyles() {
  if (stylesInjected) return;
  const style = document.createElement("style");
  style.textContent = STYLES;
  document.head.appendChild(style);
  stylesInjected = true;
}

const ICONS = {
  success: "✓",
  error: "✕",
  warn: "!",
  info: "i",
  confirm: "?",
};

const TITLES = {
  success: "Éxito",
  error: "Error",
  warn: "Advertencia",
  info: "Información",
  confirm: "Confirmar",
};

function createModal({ type, message, showCancel = false, confirmText = "Aceptar", cancelText = "Cancelar" }) {
  injectStyles();
  
  return new Promise((resolve) => {
    const overlay = document.createElement("div");
    overlay.className = "modal-overlay";
    
    const box = document.createElement("div");
    box.className = "modal-box";
    
    box.innerHTML = `
      <div class="modal-header">
        <div class="modal-icon ${type}">${ICONS[type]}</div>
        <h3 class="modal-title">${TITLES[type]}</h3>
      </div>
      <div class="modal-message">${escapeHtml(message)}</div>
      <div class="modal-buttons">
        ${showCancel ? `<button class="modal-btn secondary" data-action="cancel">${cancelText}</button>` : ""}
        <button class="modal-btn ${type === "error" ? "danger" : "primary"}" data-action="confirm">${confirmText}</button>
      </div>
    `;
    
    overlay.appendChild(box);
    document.body.appendChild(overlay);
    
    // Focus en el botón principal
    const confirmBtn = box.querySelector('[data-action="confirm"]');
    confirmBtn?.focus();
    
    const close = (result) => {
      overlay.style.animation = "fadeIn 0.15s ease-out reverse";
      setTimeout(() => {
        overlay.remove();
        resolve(result);
      }, 140);
    };
    
    // Click en botones
    box.addEventListener("click", (e) => {
      const action = e.target.dataset?.action;
      if (action === "confirm") close(true);
      if (action === "cancel") close(false);
    });
    
    // Click fuera cierra (solo para mensajes, no confirms)
    overlay.addEventListener("click", (e) => {
      if (e.target === overlay && !showCancel) {
        close(true);
      }
    });
    
    // Escape cierra
    const handleKeydown = (e) => {
      if (e.key === "Escape") {
        close(showCancel ? false : true);
        document.removeEventListener("keydown", handleKeydown);
      }
      if (e.key === "Enter") {
        close(true);
        document.removeEventListener("keydown", handleKeydown);
      }
    };
    document.addEventListener("keydown", handleKeydown);
  });
}

function escapeHtml(text) {
  const div = document.createElement("div");
  div.textContent = text;
  return div.innerHTML;
}

export const modal = {
  success: (message) => createModal({ type: "success", message }),
  error: (message) => createModal({ type: "error", message }),
  warn: (message) => createModal({ type: "warn", message }),
  info: (message) => createModal({ type: "info", message }),
  confirm: (message, { confirmText = "Confirmar", cancelText = "Cancelar" } = {}) => 
    createModal({ type: "confirm", message, showCancel: true, confirmText, cancelText }),
};

// También exportar como default para conveniencia
export default modal;