import { showConfirmDialog } from '../confirm-dialog/confirm-dialog.js';

interface CurrentUser {
  userId: string;
  email: string;
}

interface Project {
  id: string;
  name: string;
  owner_id: string;
}

interface ProjectMember {
  id: string;
  project_id: string;
  member_type: 'user' | 'group';
  member_id: string;
  role: string;
}

class ProjectEditor extends HTMLElement {
  private currentUser: CurrentUser | null = null;

  async connectedCallback(): Promise<void> {
    const res = await fetch( '/api/auth/me' );
    if ( res.ok ) this.currentUser = await res.json() as CurrentUser;
    this.render();
  }

  async render(): Promise<void> {
    const res = await fetch( '/api/projects' );
    const projects = await res.json() as Project[];

    this.innerHTML = `
      <div class="project-editor">
        <h2>Projects</h2>
        <form class="create-form">
          <input name="name" placeholder="New project name" required>
          <button type="submit">Create</button>
        </form>
        <ul class="project-list">
          ${ projects.map( p => `
            <li data-id="${ p.id }">
              <div class="project-header">
                <strong>${ p.name }</strong>
                <a class="btn-edit" href="/editor.html?project=${ p.id }&name=${ encodeURIComponent( p.name ) }">Edit</a>
                <button class="btn-members" data-id="${ p.id }">Members</button>
                <button class="btn-delete" data-id="${ p.id }" data-name="${ p.name }">Delete</button>
              </div>
              <div class="members-panel" data-project="${ p.id }" data-owner="${ p.owner_id }" style="display:none"></div>
            </li>
          ` ).join( '' ) }
        </ul>
      </div>
    `;

    this.querySelector( '.create-form' )!.addEventListener( 'submit', async ( e: Event ) => {
      e.preventDefault();
      const form = e.target as HTMLFormElement;
      const name = ( form.elements.namedItem( 'name' ) as HTMLInputElement ).value.trim();
      const res = await fetch( '/api/projects', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify( { name } )
      } );
      if ( res.ok ) this.render();
    } );

    this.querySelectorAll( '.btn-delete' ).forEach( btn => {
      btn.addEventListener( 'click', async () => {
        const el = btn as HTMLElement;
        const ok = await showConfirmDialog( {
          icon: '🗑',
          title: 'Delete Project',
          message: `Delete "${ el.dataset.name }"? This cannot be undone.`,
          confirmLabel: 'Delete',
          cancelLabel: 'Cancel',
          danger: true
        } );
        if ( !ok ) return;
        await fetch( `/api/projects/${ el.dataset.id }`, { method: 'DELETE' } );
        this.render();
      } );
    } );

    this.querySelectorAll( '.btn-members' ).forEach( btn => {
      btn.addEventListener( 'click', () => this.toggleMembers( ( btn as HTMLElement ).dataset.id! ) );
    } );
  }

  async toggleMembers( projectId: string ): Promise<void> {
    const panel = this.querySelector( `.members-panel[data-project="${ projectId }"]` ) as HTMLElement;
    if ( panel.style.display !== 'none' ) { panel.style.display = 'none'; return; }
    panel.style.display = 'block';
    await this.loadMembers( projectId, panel );
  }

  async loadMembers( projectId: string, panel: HTMLElement ): Promise<void> {
    const res = await fetch( `/api/projects/${ projectId }/members` );
    const members = await res.json() as ProjectMember[];

    const ownerId = panel.dataset.owner ?? '';
    const isOwner = this.currentUser?.userId === ownerId;
    const ownerLabel = isOwner
      ? `${ this.currentUser!.email } <span class="member-role">owner</span>`
      : `${ ownerId } <span class="member-role">owner</span>`;

    const memberRows = members.map( m => `
      <li>
        <span class="member-email">${ m.member_id }</span>
        <span class="member-role">${ m.role }</span>
        ${ isOwner ? `<button class="btn-remove-member" data-pid="${ projectId }" data-mid="${ m.id }">Remove</button>` : '' }
      </li>
    ` ).join( '' );

    panel.innerHTML = `
      <ul class="member-list">
        <li class="member-owner">${ ownerLabel }</li>
        ${ memberRows || '' }
        ${ members.length === 0 ? '<li class="empty">No additional members</li>' : '' }
      </ul>
      ${ isOwner ? `
        <form class="add-member-form">
          <input name="email" type="email" placeholder="Email address" required>
          <select name="role">
            <option value="viewer">Viewer</option>
            <option value="editor">Editor</option>
            <option value="admin">Admin</option>
          </select>
          <button type="submit">Add</button>
        </form>
      ` : '' }
    `;

    panel.querySelectorAll( '.btn-remove-member' ).forEach( btn => {
      btn.addEventListener( 'click', async () => {
        const el = btn as HTMLElement;
        await fetch( `/api/projects/${ el.dataset.pid }/members/${ el.dataset.mid }`, { method: 'DELETE' } );
        await this.loadMembers( projectId, panel );
      } );
    } );

    const addForm = panel.querySelector( '.add-member-form' ) as HTMLFormElement | null;
    addForm?.addEventListener( 'submit', async ( e: Event ) => {
      e.preventDefault();
      const data = Object.fromEntries( new FormData( e.target as HTMLFormElement ) );
      await fetch( `/api/projects/${ projectId }/members`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify( data )
      } );
      await this.loadMembers( projectId, panel );
    } );
  }
}

customElements.define( 'project-editor', ProjectEditor );