// Dashboard View

import { api } from '../api.js';
import { renderSidebar } from '../components/sidebar.js';

export async function renderDashboard(app) {
  let documents = [];
  let libraries = [];
  let tags = [];
  let searchQuery = '';
  let selectedTag = app.state.selectedTag || null;
  let selectedLibrary = app.state.selectedLibrary || null;

  try {
    const [docResult, libResult, tagResult] = await Promise.all([
      api.getDocuments(),
      api.getLibraries(),
      api.getTags()
    ]);
    documents = docResult.documents || [];
    libraries = libResult.libraries || [];
    tags = tagResult.tags || [];
  } catch (e) {
    app.showToast('Failed to load data', 'error');
  }

  const appEl = document.getElementById('app');
  
  function render() {
    // Store callbacks for sidebar event handlers
    const sidebarCallbacks = {
      onSelectLibrary: (id) => {
        selectedLibrary = id;
        selectedTag = null;
        app.state.selectedLibrary = id;
        app.state.selectedTag = null;
        render();
      },
      onSelectTag: (tag) => {
        selectedTag = tag;
        selectedLibrary = null;
        app.state.selectedTag = tag;
        app.state.selectedLibrary = null;
        render();
      },
      onHome: () => {
        selectedTag = null;
        selectedLibrary = null;
        app.state.selectedTag = null;
        app.state.selectedLibrary = null;
        render();
      }
    };
    window.__sidebarCallbacks = sidebarCallbacks;

    let filteredDocs = documents;
    
    if (searchQuery) {
      const q = searchQuery.toLowerCase();
      filteredDocs = filteredDocs.filter(d => 
        d.title.toLowerCase().includes(q) ||
        (d.content && d.content.toLowerCase().includes(q))
      );
    }
    
    if (selectedTag) {
      filteredDocs = filteredDocs.filter(d => 
        d.tags && d.tags.includes(selectedTag)
      );
    }
    
    if (selectedLibrary) {
      filteredDocs = filteredDocs.filter(d => 
        d.libraryId === selectedLibrary
      );
    }

    appEl.innerHTML = `
      <header class="app-header">
        <div class="logo">📝 SimpleNote</div>
        <div class="search-box">
          <span class="icon">🔍</span>
          <input type="text" id="search-input" placeholder="Search documents..." value="${searchQuery}">
        </div>
        <div class="header-actions">
          <button class="btn btn-primary" onclick="window.showNewDocModal()">+ New Document</button>
          <button class="btn btn-ghost" onclick="window.showNewLibraryModal()">📁 New Library</button>
        </div>
      </header>
      <div class="app-layout">
        ${renderSidebar({
          libraries,
          tags,
          selectedLibrary,
          selectedTag,
          ...sidebarCallbacks
        })}
        <main class="main-content">
          <div class="content-header">
            <h1>${selectedLibrary ? getLibraryName(libraries, selectedLibrary) : selectedTag ? `#${selectedTag}` : 'All Documents'}</h1>
            <div class="header-actions">
              <button class="btn btn-primary" onclick="window.showNewDocModal()">+ New Document</button>
            </div>
          </div>
          <div class="content-body">
            ${filteredDocs.length === 0 ? `
              <div class="empty-state">
                <div class="icon">📄</div>
                <h3>No documents found</h3>
                <p>${searchQuery || selectedTag ? 'Try adjusting your filters' : 'Create your first document'}</p>
                <button class="btn btn-primary" onclick="window.showNewDocModal()">+ Create Document</button>
              </div>
            ` : `
              <div class="doc-grid">
                ${filteredDocs.map(doc => renderDocCard(doc)).join('')}
              </div>
            `}
          </div>
        </main>
      </div>
    `;

    // Event listeners
    const searchInput = document.getElementById('search-input');
    searchInput.oninput = (e) => {
      searchQuery = e.target.value;
      render();
    };
  }

  render();
}

function getLibraryName(libraries, id) {
  const lib = libraries.find(l => l.id === id);
  return lib ? lib.name : 'Unknown';
}

function renderDocCard(doc) {
  const priorityEmoji = { high: '🔴', medium: '🟡', low: '🟢' };
  const priority = doc.priority || 'medium';
  
  return `
    <div class="doc-card" onclick="window.app.navigate('document', {id: '${doc.id}'})">
      <div class="doc-card-header">
        <span class="doc-id">${doc.id}</span>
        <span class="type-badge ${doc.type || 'general'}">${doc.type || 'general'}</span>
      </div>
      <h3 class="doc-title">${escapeHtml(doc.title)}</h3>
      ${doc.tags && doc.tags.length ? `
        <div class="doc-tags">
          ${doc.tags.map(t => `<span class="tag-pill">${escapeHtml(t)}</span>`).join('')}
        </div>
      ` : ''}
      <div class="doc-meta">
        <span class="doc-meta-item">📅 ${formatDate(doc.createdAt)}</span>
        <span class="doc-meta-item">👤 ${escapeHtml(doc.author || 'unknown')}</span>
        <span class="status-badge ${doc.status || 'draft'}">${doc.status || 'draft'}</span>
        <span class="priority-indicator">${priorityEmoji[priority]}</span>
      </div>
    </div>
  `;
}

function escapeHtml(str) {
  if (!str) return '';
  const div = document.createElement('div');
  div.textContent = str;
  return div.innerHTML;
}

function formatDate(dateStr) {
  if (!dateStr) return '';
  const date = new Date(dateStr);
  return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
}

// Global function: Show modal to create new document (with library selection)
window.showNewDocModal = async function() {
  let libraries = [];
  try {
    const libResult = await api.getLibraries();
    libraries = libResult.libraries || [];
  } catch (e) {}

  let step = 1; // 1 = choose library, 2 = create new library
  let newLibraryName = '';

  function render() {
    const backdrop = document.createElement('div');
    backdrop.className = 'modal-backdrop';
    
    if (step === 1) {
      backdrop.innerHTML = `
        <div class="modal" style="min-width: 450px;">
          <div class="modal-header">
            <span>📄</span>
            <h3>Create New Document</h3>
            <button class="modal-close" onclick="this.closest('.modal-backdrop').remove()">✕</button>
          </div>
          <div class="modal-body">
            <p style="color: var(--color-text-secondary); margin-bottom: 16px;">Choose a library for your document:</p>
            <div class="form-group">
              <label for="doc-library-select">Library</label>
              <select id="doc-library-select" class="form-control">
                <option value="">— No Library —</option>
                ${libraries.map(l => `<option value="${l.id}">📁 ${escapeHtml(l.name)}</option>`).join('')}
                <option value="__new__">+ Create New Library</option>
              </select>
            </div>
          </div>
          <div class="modal-footer">
            <button class="btn btn-ghost" onclick="this.closest('.modal-backdrop').remove()">Cancel</button>
            <button class="btn btn-primary" id="doc-next-btn">Next →</button>
          </div>
        </div>
      `;
    } else {
      backdrop.innerHTML = `
        <div class="modal" style="min-width: 450px;">
          <div class="modal-header">
            <span>📁</span>
            <h3>Create New Library</h3>
            <button class="modal-close" onclick="this.closest('.modal-backdrop').remove()">✕</button>
          </div>
          <div class="modal-body">
            <div class="form-group">
              <label for="new-library-name">Library Name</label>
              <input type="text" id="new-library-name" class="form-control" placeholder="e.g., Backend Requirements" value="${escapeHtml(newLibraryName)}">
            </div>
          </div>
          <div class="modal-footer">
            <button class="btn btn-ghost" id="doc-back-btn">← Back</button>
            <button class="btn btn-primary" id="doc-create-lib-btn">Create Library</button>
          </div>
        </div>
      `;
    }

    document.body.appendChild(backdrop);

    if (step === 1) {
      const select = document.getElementById('doc-library-select');
      const nextBtn = document.getElementById('doc-next-btn');
      
      nextBtn.onclick = () => {
        const value = select.value;
        if (value === '__new__') {
          step = 2;
          backdrop.remove();
          render();
        } else {
          backdrop.remove();
          window.app.navigate('editor', { libraryId: value || null });
        }
      };
    } else {
      const backBtn = document.getElementById('doc-back-btn');
      const createBtn = document.getElementById('doc-create-lib-btn');
      const nameInput = document.getElementById('new-library-name');
      
      backBtn.onclick = () => {
        newLibraryName = nameInput.value;
        step = 1;
        backdrop.remove();
        render();
      };
      
      createBtn.onclick = async () => {
        const name = nameInput.value.trim();
        if (!name) {
          window.app.showToast('Please enter a library name', 'error');
          return;
        }
        try {
          const result = await api.createLibrary({ name });
          backdrop.remove();
          window.app.showToast('Library created', 'success');
          window.app.navigate('editor', { libraryId: result.id });
        } catch (e) {
          window.app.showToast('Failed to create library: ' + e.message, 'error');
        }
      };
    }

    backdrop.onclick = (e) => {
      if (e.target === backdrop) backdrop.remove();
    };
  }

  render();
};

// Global function: Show modal to create new library
window.showNewLibraryModal = function() {
  const backdrop = document.createElement('div');
  backdrop.className = 'modal-backdrop';
  backdrop.innerHTML = `
    <div class="modal" style="min-width: 450px;">
      <div class="modal-header">
        <span>📁</span>
        <h3>Create New Library</h3>
        <button class="modal-close" onclick="this.closest('.modal-backdrop').remove()">✕</button>
      </div>
      <div class="modal-body">
        <p style="color: var(--color-text-secondary); margin-bottom: 16px;">Libraries help you organize your documents.</p>
        <div class="form-group">
          <label for="new-lib-name">Library Name</label>
          <input type="text" id="new-lib-name" class="form-control" placeholder="e.g., Backend Requirements">
        </div>
      </div>
      <div class="modal-footer">
        <button class="btn btn-ghost" onclick="this.closest('.modal-backdrop').remove()">Cancel</button>
        <button class="btn btn-primary" id="create-lib-btn">Create Library</button>
      </div>
    </div>
  `;
  document.body.appendChild(backdrop);

  const nameInput = document.getElementById('new-lib-name');
  const createBtn = document.getElementById('create-lib-btn');
  
  createBtn.onclick = async () => {
    const name = nameInput.value.trim();
    if (!name) {
      window.app.showToast('Please enter a library name', 'error');
      return;
    }
    try {
      await api.createLibrary({ name });
      backdrop.remove();
      window.app.showToast('Library created successfully', 'success');
      window.app.navigate('dashboard');
    } catch (e) {
      window.app.showToast('Failed to create library: ' + e.message, 'error');
    }
  };

  backdrop.onclick = (e) => {
    if (e.target === backdrop) backdrop.remove();
  };

  nameInput.focus();
};