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

declare global
{
  interface Window
  {
    electronLocal?: {
      openFolder: () => Promise<string | null>;
      getRecents: () => Promise<string[]>;
      removeRecent: ( p: string ) => Promise<string[]>;
    };
  }
}

const AUTH_HOST = 'https://account.rokojori.com';
const APP_URL   = 'https://roject.rokojori.com';

interface JwtUser
{
  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;
}

function hueFromId( id: string ): number
{
  let h = 0;
  for ( let i = 0; i < id.length; i++ )
  {
    h = ( h * 31 + id.charCodeAt( i ) ) % 360;
  }
  return Math.abs( h );
}

function escapeAttr( s: string ): string
{
  return s.replace( /&/g, '&amp;' ).replace( /"/g, '&quot;' );
}

function folderName( folderPath: string ): string
{
  const parts = folderPath.split( /[\\/]/ ).filter( Boolean );
  return parts[ parts.length - 1 ] ?? folderPath;
}

class ProjectListDefault extends HTMLElement
{
  user: JwtUser | null = null;
  _activeTab: 'local' | 'online' = 'local';
  _isRemoteOnline = false;

  private _projectUrl( path: string ): string
  {
    return this._isRemoteOnline ? `/api/remote/projects${ path }` : `/api/projects${ path }`;
  }

  async connectedCallback(): Promise<void>
  {
    await this.render();
  }

  private async render(): Promise<void>
  {
    if ( window.electronLocal )
    {
      this._renderElectronShell();
      await this._renderTabContent();
      return;
    }
    await this._renderFull();
  }

  // ── Electron: shell (nav + empty content + overlays) ────────────────────

  private _renderElectronShell(): void
  {
    const logoutHref = `${ AUTH_HOST }/api/auth/logout?redirect=${ encodeURIComponent( APP_URL ) }`;

    this.innerHTML = `
      <nav class="pld-nav">
        <div class="pld-logo-wrap">
          <img class="pld-logo" src="/rojos/roject-logo-570x240-1592x637.webp" alt="Roject">
        </div>
        <pld-tabs>
          <pld-tab class="${ 'local' === this._activeTab ? 'active' : '' }" data-tab="local">This PC</pld-tab>
          <pld-tab class="${ 'online' === this._activeTab ? 'active' : '' }" data-tab="online">Online</pld-tab>
        </pld-tabs>
        <a class="pld-user-group" href="${ logoutHref }">
          <span class="pld-email">${ this.user?.email ?? '' }</span>
          <span class="pld-logout-label">Log out</span>
        </a>
      </nav>
      <main class="pld-main">
        <div class="pld-list" id="pld-content"></div>
      </main>
      <div class="pld-members-overlay" style="display:none"></div>
      <div class="pld-create-overlay" style="display:none"></div>
    `;

    this.querySelectorAll( 'pld-tab' ).forEach( tab =>
    {
      tab.addEventListener( 'click', async () =>
      {
        const t = ( tab as HTMLElement ).dataset.tab as 'local' | 'online';
        if ( t === this._activeTab ) return;
        this._activeTab = t;
        this.querySelectorAll( 'pld-tab' ).forEach( el => el.classList.remove( 'active' ) );
        tab.classList.add( 'active' );
        await this._renderTabContent();
      } );
    } );
  }

  private async _renderTabContent(): Promise<void>
  {
    const content = this.querySelector( '#pld-content' ) as HTMLElement;
    if ( 'local' === this._activeTab )
    {
      await this._renderLocalContent( content );
    }
    else
    {
      await this._renderOnlineContent( content );
    }
  }

  // ── Electron: local tab ─────────────────────────────────────────────────

  private async _renderLocalContent( container: HTMLElement ): Promise<void>
  {
    const recents = await window.electronLocal!.getRecents();

    container.innerHTML = `
      <div class="pld-row new-project" id="pld-open-folder">
        <div class="pld-badge-wrap"><div class="pld-badge"></div></div>
        <span class="pld-name">Open Folder…</span>
      </div>
      ${ recents.map( r => this._recentFolderRowHtml( r ) ).join( '' ) }
      ${ recents.length === 0 ? '<p class="pld-no-recents">No recent folders</p>' : '' }
    `;

    container.querySelector( '#pld-open-folder' )!.addEventListener( 'click', async () =>
    {
      const fp = await window.electronLocal!.openFolder();
      if ( null != fp ) this._openLocalFolder( fp );
    } );

    container.querySelectorAll( '.pld-recent-row' ).forEach( row =>
    {
      row.addEventListener( 'click', ( e: Event ) =>
      {
        if ( ( e.target as HTMLElement ).closest( '.pld-btn-remove' ) ) return;
        this._openLocalFolder( ( row as HTMLElement ).dataset.path! );
      } );
    } );

    container.querySelectorAll( '.pld-btn-remove' ).forEach( btn =>
    {
      btn.addEventListener( 'click', async ( e: Event ) =>
      {
        e.stopPropagation();
        await window.electronLocal!.removeRecent( ( btn as HTMLElement ).dataset.path! );
        await this._renderLocalContent( container );
      } );
    } );
  }

  private _recentFolderRowHtml( fp: string ): string
  {
    const color = `hsl( ${ hueFromId( fp ) }, 95%, 45% )`;
    return `
      <div class="pld-row pld-recent-row" data-path="${ escapeAttr( fp ) }" style="--project-color: ${ color }">
        <div class="pld-badge-wrap">
          <div class="pld-badge"></div>
          <button class="pld-btn-remove" data-path="${ escapeAttr( fp ) }" title="Remove from recents">
            <svg viewBox="0 0 20 20" fill="none" stroke="#fff" stroke-width="2.5" stroke-linecap="round">
              <line x1="5" y1="5" x2="15" y2="15"/><line x1="15" y1="5" x2="5" y2="15"/>
            </svg>
          </button>
        </div>
        <span class="pld-name">${ folderName( fp ).toUpperCase() }</span>
      </div>
    `;
  }

  private _openLocalFolder( fp: string ): void
  {
    const name = folderName( fp );
    location.href = `/editor.html?localRoot=${ encodeURIComponent( fp ) }&name=${ encodeURIComponent( name ) }`;
  }

  // ── Electron: online tab ────────────────────────────────────────────────

  private async _renderOnlineContent( container: HTMLElement ): Promise<void>
  {
    this._isRemoteOnline = true;
    const res = await fetch( this._projectUrl( '' ) );
    const projects = res.ok ? await res.json() as Project[] : [];

    container.innerHTML = `
      <div class="pld-row new-project" id="pld-new-row">
        <div class="pld-badge-wrap"><div class="pld-badge"></div></div>
        <span class="pld-name">New Project…</span>
      </div>
      ${ projects.map( ( p, i ) => this.rowHtml( p, i ) ).join( '' ) }
    `;

    this.bindEvents( projects );
  }

  // ── Web (non-Electron): full render ─────────────────────────────────────

  private async _renderFull(): Promise<void>
  {
    this._isRemoteOnline = false;
    const res = await fetch( '/api/projects' );
    const projects = res.ok ? await res.json() as Project[] : [];
    const logoutHref = `${ AUTH_HOST }/api/auth/logout?redirect=${ encodeURIComponent( APP_URL ) }`;

    this.innerHTML = `
      <nav class="pld-nav">
        <div class="pld-logo-wrap">
          <img class="pld-logo" src="/rojos/roject-logo-570x240-1592x637.webp" alt="Roject">
        </div>
        <a class="pld-user-group" href="${ logoutHref }">
          <span class="pld-email">${ this.user?.email ?? '' }</span>
          <span class="pld-logout-label">Log out</span>
        </a>
      </nav>
      <main class="pld-main">
        <div class="pld-list">
          <div class="pld-row new-project" id="pld-new-row">
            <div class="pld-badge-wrap">
              <div class="pld-badge"></div>
            </div>
            <span class="pld-name">New Project…</span>
          </div>
          ${ projects.map( ( p, i ) => this.rowHtml( p, i ) ).join( '' ) }
        </div>
      </main>
      <div class="pld-members-overlay" style="display:none"></div>
      <div class="pld-create-overlay" style="display:none"></div>
    `;

    this.bindEvents( projects );
  }

  // ── Shared helpers ──────────────────────────────────────────────────────

  private rowHtml( p: Project, i: number ): string
  {
    const color = `hsl( ${ hueFromId( p.id ) }, 95%, 45% )`;
    return `
      <div class="pld-row" data-id="${ p.id }" data-name="${ escapeAttr( p.name ) }" data-owner="${ p.owner_id }"
           style="--project-color: ${ color }; animation-delay: ${ 0.04 + i * 0.06 }s">
        <div class="pld-badge-wrap">
          <div class="pld-badge" style="animation-delay: ${ i * 0.45 }s"></div>
          <button class="pld-btn-delete" data-id="${ p.id }" data-name="${ escapeAttr( p.name ) }" title="Delete">
            <svg viewBox="0 0 20 20" fill="none" stroke="#fff" stroke-width="2.5" stroke-linecap="round">
              <line x1="5" y1="5" x2="15" y2="15"/><line x1="15" y1="5" x2="5" y2="15"/>
            </svg>
          </button>
          <button class="pld-btn-members" data-id="${ p.id }" title="Members">
            <svg viewBox="0 0 20 20" fill="none" stroke="#fff" stroke-width="1.8" stroke-linecap="round">
              <circle cx="10" cy="7.5" r="3"/>
              <path d="M3.5 17.5c0-3.6 2.9-6 6.5-6s6.5 2.4 6.5 6"/>
            </svg>
          </button>
        </div>
        <span class="pld-name">${ p.name.toUpperCase() }</span>
      </div>
    `;
  }

  private bindEvents( projects: Project[] ): void
  {
    this.querySelector( '#pld-new-row' )!.addEventListener( 'click', () => this.openCreateDialog() );

    this.querySelectorAll( '.pld-row:not(.new-project)' ).forEach( row =>
    {
      row.addEventListener( 'click', ( e: Event ) =>
      {
        if ( ( e.target as HTMLElement ).closest( '.pld-btn-delete, .pld-btn-members' ) ) return;
        const el = row as HTMLElement;
        const param = this._isRemoteOnline ? 'remoteProject' : 'project';
        location.href = `/editor.html?${ param }=${ el.dataset.id }&name=${ encodeURIComponent( el.dataset.name! ) }`;
      } );
    } );

    this.querySelectorAll( '.pld-btn-delete' ).forEach( btn =>
    {
      btn.addEventListener( 'click', async ( e: Event ) =>
      {
        e.stopPropagation();
        const el = btn as HTMLElement;
        const ok = await showConfirmDialog( {
          icon: '🗑',
          title: 'Delete Project',
          message: `Delete "${ el.dataset.name }"? This cannot be undone.`,
          confirmLabel: 'Delete',
          cancelLabel: 'Cancel',
          danger: true
        } );
        if ( !ok ) return;
        await fetch( this._projectUrl( `/${ el.dataset.id }` ), { method: 'DELETE' } );
        if ( window.electronLocal )
        {
          await this._renderOnlineContent( this.querySelector( '#pld-content' ) as HTMLElement );
        }
        else
        {
          await this._renderFull();
        }
      } );
    } );

    this.querySelectorAll( '.pld-btn-members' ).forEach( btn =>
    {
      btn.addEventListener( 'click', ( e: Event ) =>
      {
        e.stopPropagation();
        const id = ( btn as HTMLElement ).dataset.id!;
        const row = this.querySelector( `.pld-row[data-id="${ id }"]` ) as HTMLElement;
        this.openMembersPanel( id, row );
      } );
    } );
  }

  private openCreateDialog(): void
  {
    const overlay = this.querySelector( '.pld-create-overlay' ) as HTMLElement;
    overlay.style.display = 'flex';
    overlay.innerHTML = `
      <div class="pld-mp">
        <h3 class="pld-mp-title">New Project</h3>
        <form class="pld-cp-form">
          <input class="pld-mp-input pld-cp-input" type="text" name="name"
                 placeholder="Project name" required autocomplete="off">
          <div class="pld-cp-actions">
            <button type="button" class="pld-mp-btn pld-cp-cancel">Cancel</button>
            <button type="submit" class="pld-mp-btn">Create</button>
          </div>
        </form>
      </div>
    `;

    const panel = overlay.querySelector( '.pld-mp' )!;
    panel.addEventListener( 'click', e => e.stopPropagation() );
    overlay.addEventListener( 'click', () => { overlay.style.display = 'none'; }, { once: true } );

    const input = overlay.querySelector( '.pld-cp-input' ) as HTMLInputElement;
    setTimeout( () => input.focus(), 30 );

    overlay.querySelector( '.pld-cp-cancel' )!.addEventListener( 'click', () =>
    {
      overlay.style.display = 'none';
    } );

    overlay.querySelector( '.pld-cp-form' )!.addEventListener( 'submit', async ( e: Event ) =>
    {
      e.preventDefault();
      const name = input.value.trim();
      if ( !name ) return;
      overlay.style.display = 'none';
      const res = await fetch( this._projectUrl( '' ), {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify( { name } )
      } );
      if ( res.ok )
      {
        if ( window.electronLocal )
        {
          await this._renderOnlineContent( this.querySelector( '#pld-content' ) as HTMLElement );
        }
        else
        {
          await this._renderFull();
        }
      }
    } );
  }

  private async openMembersPanel( projectId: string, row: HTMLElement ): Promise<void>
  {
    const overlay = this.querySelector( '.pld-members-overlay' ) as HTMLElement;
    overlay.style.display = 'flex';
    overlay.innerHTML = `<div class="pld-mp"><p class="pld-mp-loading">Loading…</p></div>`;

    const panel = overlay.querySelector( '.pld-mp' )!;
    panel.addEventListener( 'click', e => e.stopPropagation() );
    overlay.addEventListener( 'click', () => { overlay.style.display = 'none'; }, { once: true } );

    const res = await fetch( this._projectUrl( `/${ projectId }/members` ) );
    const members = res.ok ? await res.json() as ProjectMember[] : [];

    const ownerId = row.dataset.owner ?? '';
    const isOwner = this.user?.userId === ownerId;
    const ownerLabel = isOwner ? this.user!.email : ownerId;

    panel.innerHTML = `
      <h3 class="pld-mp-title">${ row.dataset.name }</h3>
      <ul class="pld-mp-list">
        <li class="pld-mp-owner-row">
          <span class="pld-mp-email">${ ownerLabel }</span>
          <span class="pld-mp-role">owner</span>
        </li>
        ${ members.map( m => `
          <li>
            <span class="pld-mp-email">${ m.member_id }</span>
            <span class="pld-mp-role">${ m.role }</span>
            ${ isOwner ? `<button class="pld-mp-remove" data-pid="${ projectId }" data-mid="${ m.id }">Remove</button>` : '' }
          </li>
        ` ).join( '' ) }
        ${ members.length === 0 ? '<li class="pld-mp-empty">No additional members</li>' : '' }
      </ul>
      ${ isOwner ? `
        <form class="pld-mp-add-form">
          <input name="email" type="email" placeholder="Email address" class="pld-mp-input" required>
          <select name="role" class="pld-mp-select">
            <option value="viewer">Viewer</option>
            <option value="editor">Editor</option>
            <option value="admin">Admin</option>
          </select>
          <button type="submit" class="pld-mp-btn">Add</button>
        </form>
      ` : '' }
      <button class="pld-mp-close pld-mp-btn">Close</button>
    `;

    panel.querySelector( '.pld-mp-close' )!.addEventListener( 'click', () => { overlay.style.display = 'none'; } );

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

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

customElements.define( 'project-list-default', ProjectListDefault );