import {
  DeesElement,
  property,
  html,
  customElement,
  type TemplateResult,
  cssManager,
  css,
  state,
} from '@design.estate/dees-element';
import '@design.estate/dees-catalog';

declare global {
  interface HTMLElementTagNameMap {
    'opencdn-peekpage': OpencdnPeekpage;
  }
}

interface IFileNode {
  name: string;
  path: string;
  isFile: boolean;
  children?: IFileNode[];
}

@customElement('opencdn-peekpage')
export class OpencdnPeekpage extends DeesElement {
  @property({ type: String })
  public accessor packageName: string = '';

  @property({ type: String })
  public accessor version: string = '';

  @property({ type: Array })
  public accessor allowedPackages: string[] = [];

  @state()
  private accessor files: string[] = [];

  @state()
  private accessor fileTree: IFileNode[] = [];

  @state()
  private accessor selectedFile: string | null = null;

  @state()
  private accessor fileContent: string = '';

  @state()
  private accessor loading: boolean = false;

  @state()
  private accessor searchQuery: string = '';

  @state()
  private accessor availableVersions: string[] = [];

  @state()
  private accessor expandedFolders: Set<string> = new Set();

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        --background: #09090b;
        --foreground: #fafafa;
        --muted: #27272a;
        --muted-foreground: #a1a1aa;
        --border: #27272a;
        --primary: #fafafa;
        --primary-foreground: #18181b;
        --secondary: #27272a;
        --ring: #d4d4d8;

        display: block;
        height: 100vh;
        background: var(--background);
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        color: var(--foreground);
        -webkit-font-smoothing: antialiased;
      }

      * {
        box-sizing: border-box;
      }

      .app {
        display: flex;
        flex-direction: column;
        height: 100%;
      }

      /* Header */
      .header {
        display: flex;
        align-items: center;
        gap: 16px;
        padding: 12px 20px;
        background: var(--background);
        border-bottom: 1px solid var(--border);
      }

      .header-logo {
        display: flex;
        align-items: center;
        gap: 10px;
        font-weight: 600;
        color: var(--foreground);
        text-decoration: none;
        cursor: pointer;
        transition: color 0.15s;
      }

      .header-logo:hover {
        color: var(--muted-foreground);
      }

      .header-sep {
        color: var(--border);
      }

      .header-package {
        font-weight: 600;
        color: var(--foreground);
      }

      .header-version {
        padding: 4px 10px;
        background: var(--muted);
        border-radius: 6px;
        font-size: 12px;
        color: var(--muted-foreground);
      }

      .header-spacer {
        flex: 1;
      }

      .version-select {
        padding: 8px 12px;
        background: var(--muted);
        border: 1px solid var(--border);
        border-radius: 6px;
        color: var(--foreground);
        font-size: 13px;
        cursor: pointer;
        transition: border-color 0.15s;
      }

      .version-select:hover,
      .version-select:focus {
        border-color: var(--ring);
        outline: none;
      }

      /* Main Content */
      .main {
        display: flex;
        flex: 1;
        overflow: hidden;
      }

      /* Sidebar */
      .sidebar {
        width: 300px;
        background: var(--background);
        border-right: 1px solid var(--border);
        display: flex;
        flex-direction: column;
      }

      .sidebar-header {
        padding: 12px 16px;
        font-size: 12px;
        font-weight: 500;
        color: var(--muted-foreground);
        text-transform: uppercase;
        letter-spacing: 0.05em;
        border-bottom: 1px solid var(--border);
      }

      .file-tree {
        flex: 1;
        overflow-y: auto;
        padding: 8px 0;
      }

      /* Tree Items */
      .tree-folder {
        user-select: none;
      }

      .folder-header {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 8px 16px;
        cursor: pointer;
        font-size: 13px;
        color: var(--foreground);
        transition: background 0.15s;
      }

      .folder-header:hover {
        background: var(--muted);
      }

      .folder-chevron {
        margin-left: auto;
        font-size: 10px;
        color: var(--muted-foreground);
        transition: transform 0.15s;
      }

      .folder-chevron.open {
        transform: rotate(90deg);
      }

      .folder-children {
        padding-left: 16px;
      }

      .tree-file {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 8px 16px;
        cursor: pointer;
        font-size: 13px;
        color: var(--muted-foreground);
        transition: all 0.15s;
      }

      .tree-file:hover {
        background: var(--muted);
        color: var(--foreground);
      }

      .tree-file.active {
        background: var(--primary);
        color: var(--primary-foreground);
      }

      /* Content Area */
      .content {
        flex: 1;
        display: flex;
        flex-direction: column;
        overflow: hidden;
      }

      .content-header {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 12px 20px;
        background: var(--background);
        border-bottom: 1px solid var(--border);
      }

      .content-path {
        font-family: 'SF Mono', 'Fira Code', monospace;
        font-size: 13px;
        color: var(--muted-foreground);
      }

      .content-path span {
        color: var(--foreground);
      }

      .content-actions {
        margin-left: auto;
        display: flex;
        gap: 8px;
      }

      /* Code Viewer */
      .code-viewer {
        flex: 1;
        overflow: auto;
        background: var(--background);
      }

      .code-viewer pre {
        margin: 0;
        padding: 16px 20px;
        font-family: 'SF Mono', 'Fira Code', monospace;
        font-size: 13px;
        line-height: 1.6;
        white-space: pre-wrap;
        word-break: break-all;
        color: var(--foreground);
      }

      /* Empty State */
      .empty-state {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        color: var(--muted-foreground);
        gap: 12px;
      }

      /* Package List View */
      .package-list-container {
        max-width: 700px;
        margin: 0 auto;
        padding: 60px 24px;
        width: 100%;
      }

      .page-title {
        font-size: 24px;
        font-weight: 600;
        margin-bottom: 24px;
      }

      .search-box {
        position: relative;
        margin-bottom: 20px;
      }

      .search-input {
        width: 100%;
        padding: 14px 16px 14px 44px;
        background: var(--muted);
        border: 1px solid var(--border);
        border-radius: 8px;
        color: var(--foreground);
        font-size: 14px;
        font-family: inherit;
        outline: none;
        transition: border-color 0.15s;
      }

      .search-input:focus {
        border-color: var(--ring);
      }

      .search-input::placeholder {
        color: var(--muted-foreground);
      }

      .search-icon {
        position: absolute;
        left: 14px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--muted-foreground);
      }

      .package-count {
        color: var(--muted-foreground);
        font-size: 13px;
        margin-bottom: 16px;
      }

      .package-list {
        display: flex;
        flex-direction: column;
        gap: 8px;
      }

      .package-link {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 16px 20px;
        background: var(--muted);
        border: 1px solid var(--border);
        border-radius: 8px;
        color: var(--foreground);
        font-family: 'SF Mono', 'Fira Code', monospace;
        font-size: 14px;
        cursor: pointer;
        transition: all 0.15s;
      }

      .package-link:hover {
        background: var(--primary);
        border-color: var(--primary);
        color: var(--primary-foreground);
      }

      .no-results {
        text-align: center;
        padding: 40px 20px;
        color: var(--muted-foreground);
      }

      /* Scrollbar */
      ::-webkit-scrollbar {
        width: 8px;
        height: 8px;
      }
      ::-webkit-scrollbar-track {
        background: transparent;
      }
      ::-webkit-scrollbar-thumb {
        background: var(--muted);
        border-radius: 4px;
      }
      ::-webkit-scrollbar-thumb:hover {
        background: #3f3f46;
      }
    `,
  ];

  async connectedCallback() {
    super.connectedCallback();
    // Parse URL to get package name
    const path = window.location.pathname;
    if (path.startsWith('/peek/') && path.length > 6) {
      const parts = path.slice(6).split('/');
      if (parts[0]?.startsWith('@') && parts[1]) {
        this.packageName = `${parts[0]}/${parts[1]}`;
        await this.loadPackageFiles();
      }
    }
  }

  private async loadPackageFiles() {
    if (!this.packageName) return;

    this.loading = true;
    try {
      // Fetch file list from API
      const response = await fetch(`/api/files/${this.packageName}?version=${this.version}`);
      if (response.ok) {
        const data = await response.json();
        this.files = data.files || [];
        this.availableVersions = data.versions || [];
        this.fileTree = this.buildFileTree(this.files);
      }
    } catch (err) {
      console.error('Failed to load package files:', err);
    }
    this.loading = false;
  }

  private buildFileTree(files: string[]): IFileNode[] {
    const root: IFileNode[] = [];

    for (const filePath of files) {
      const parts = filePath.split('/').filter(Boolean);
      let currentLevel = root;
      let currentPath = '';

      for (let i = 0; i < parts.length; i++) {
        const part = parts[i];
        currentPath += '/' + part;
        const isFile = i === parts.length - 1;

        let existing = currentLevel.find(n => n.name === part);
        if (!existing) {
          existing = {
            name: part,
            path: currentPath,
            isFile,
            children: isFile ? undefined : [],
          };
          currentLevel.push(existing);
        }

        if (!isFile && existing.children) {
          currentLevel = existing.children;
        }
      }
    }

    // Sort: folders first, then files, alphabetically
    const sortNodes = (nodes: IFileNode[]) => {
      nodes.sort((a, b) => {
        if (a.isFile && !b.isFile) return 1;
        if (!a.isFile && b.isFile) return -1;
        return a.name.localeCompare(b.name);
      });
      for (const node of nodes) {
        if (node.children) sortNodes(node.children);
      }
    };
    sortNodes(root);

    return root;
  }

  private toggleFolder(path: string) {
    const newSet = new Set(this.expandedFolders);
    if (newSet.has(path)) {
      newSet.delete(path);
    } else {
      newSet.add(path);
    }
    this.expandedFolders = newSet;
  }

  private async selectFile(filePath: string) {
    this.selectedFile = filePath;
    this.loading = true;

    try {
      const url = `/${this.packageName}${filePath}?version=${this.version}`;
      const response = await fetch(url);
      this.fileContent = await response.text();
    } catch (err) {
      this.fileContent = 'Failed to load file';
    }

    this.loading = false;
  }

  private navigateToPackage(pkg: string) {
    window.location.href = `/peek/${pkg}`;
  }

  private get filteredPackages(): string[] {
    if (!this.searchQuery) return this.allowedPackages;
    const query = this.searchQuery.toLowerCase();
    return this.allowedPackages.filter(pkg => pkg.toLowerCase().includes(query));
  }

  private renderTreeNode(node: IFileNode): TemplateResult {
    if (node.isFile) {
      return html`
        <div
          class="tree-file ${this.selectedFile === node.path ? 'active' : ''}"
          @click=${() => this.selectFile(node.path)}
        >
          <dees-icon .icon=${'lucide:file'} .iconSize=${14}></dees-icon>
          ${node.name}
        </div>
      `;
    }

    const isExpanded = this.expandedFolders.has(node.path);
    return html`
      <div class="tree-folder">
        <div class="folder-header" @click=${() => this.toggleFolder(node.path)}>
          <dees-icon .icon=${isExpanded ? 'lucide:folder-open' : 'lucide:folder'} .iconSize=${14}></dees-icon>
          ${node.name}
          <span class="folder-chevron ${isExpanded ? 'open' : ''}">▶</span>
        </div>
        ${isExpanded && node.children ? html`
          <div class="folder-children">
            ${node.children.map(child => this.renderTreeNode(child))}
          </div>
        ` : ''}
      </div>
    `;
  }

  private renderPackageList(): TemplateResult {
    const filtered = this.filteredPackages;

    return html`
      <div class="package-list-container">
        <div class="header-logo" @click=${() => window.location.href = '/'}>
          <dees-icon .icon=${'lucide:package'} .iconSize=${24}></dees-icon>
          opencdn
        </div>

        <h1 class="page-title" style="margin-top: 32px;">Browse Packages</h1>

        <div class="search-box">
          <dees-icon class="search-icon" .icon=${'lucide:search'} .iconSize=${16}></dees-icon>
          <input
            type="text"
            class="search-input"
            placeholder="Search packages..."
            .value=${this.searchQuery}
            @input=${(e: Event) => this.searchQuery = (e.target as HTMLInputElement).value}
          />
        </div>

        <div class="package-count">
          ${filtered.length === this.allowedPackages.length
            ? `${this.allowedPackages.length} package${this.allowedPackages.length !== 1 ? 's' : ''} available`
            : `${filtered.length} of ${this.allowedPackages.length} packages`}
        </div>

        ${filtered.length > 0 ? html`
          <div class="package-list">
            ${filtered.map(pkg => html`
              <div class="package-link" @click=${() => this.navigateToPackage(pkg)}>
                <dees-icon .icon=${'lucide:package'} .iconSize=${16}></dees-icon>
                ${pkg}
              </div>
            `)}
          </div>
        ` : html`
          <div class="no-results">No packages found matching your search.</div>
        `}
      </div>
    `;
  }

  private renderFileBrowser(): TemplateResult {
    return html`
      <div class="app">
        <header class="header">
          <div class="header-logo" @click=${() => window.location.href = '/'}>
            <dees-icon .icon=${'lucide:package'} .iconSize=${20}></dees-icon>
            opencdn
          </div>
          <span class="header-sep">/</span>
          <span class="header-package">${this.packageName}</span>
          <span class="header-version">${this.version || 'latest'}</span>
          <div class="header-spacer"></div>
          ${this.availableVersions.length > 0 ? html`
            <select
              class="version-select"
              @change=${(e: Event) => {
                this.version = (e.target as HTMLSelectElement).value;
                this.loadPackageFiles();
              }}
            >
              <option value="">latest</option>
              ${this.availableVersions.map(v => html`
                <option value=${v} ?selected=${v === this.version}>${v}</option>
              `)}
            </select>
          ` : ''}
          <dees-button @click=${() => window.location.href = '/peek/'}>
            <dees-icon .icon=${'lucide:arrow-left'} .iconSize=${14} slot="iconLeft"></dees-icon>
            All Packages
          </dees-button>
        </header>

        <div class="main">
          <aside class="sidebar">
            <div class="sidebar-header">Files (${this.files.length})</div>
            <div class="file-tree">
              ${this.fileTree.map(node => this.renderTreeNode(node))}
            </div>
          </aside>

          <main class="content">
            ${this.selectedFile ? html`
              <div class="content-header">
                <div class="content-path">
                  <span>${this.selectedFile}</span>
                </div>
                <div class="content-actions">
                  <dees-button @click=${() => {
                    const url = `/${this.packageName}${this.selectedFile}?version=${this.version}`;
                    window.open(url, '_blank');
                  }}>
                    <dees-icon .icon=${'lucide:external-link'} .iconSize=${14} slot="iconLeft"></dees-icon>
                    Raw
                  </dees-button>
                </div>
              </div>
              <div class="code-viewer">
                ${this.loading ? html`
                  <div class="empty-state">
                    <dees-spinner></dees-spinner>
                  </div>
                ` : html`
                  <pre>${this.fileContent}</pre>
                `}
              </div>
            ` : html`
              <div class="empty-state">
                <dees-icon .icon=${'lucide:file-text'} .iconSize=${48} style="opacity: 0.5;"></dees-icon>
                <div>Select a file to view its contents</div>
              </div>
            `}
          </main>
        </div>
      </div>
    `;
  }

  public render(): TemplateResult {
    if (this.packageName) {
      return this.renderFileBrowser();
    }
    return this.renderPackageList();
  }
}