import * as plugins from '../../plugins.js';
import {
  customElement,
  DeesElement,
  html,
  css,
  cssManager,
  state,
  type TemplateResult,
} from '@design.estate/dees-element';

import { accountDesignTokens } from './sharedstyles.js';
import { IdpState } from '../../states/idp.state.js';

interface IParsedEmail {
  email: string;
  valid: boolean;
  error?: string;
}

interface IBulkInviteResult {
  invitedCount: number;
  failedCount: number;
  alreadyMemberCount: number;
}

// Internal form element for reactive state management
@customElement('idp-bulk-invite-form')
export class BulkInviteForm extends DeesElement {
  @state()
  accessor organizationId: string = '';

  @state()
  accessor organizationName: string = '';

  @state()
  accessor parsedEmails: IParsedEmail[] = [];

  @state()
  accessor selectedRoles: string[] = ['viewer'];

  @state()
  accessor submitting: boolean = false;

  @state()
  accessor error: string = '';

  @state()
  accessor results: IBulkInviteResult | null = null;

  private static readonly AVAILABLE_ROLES = ['admin', 'editor', 'viewer', 'guest'];

  public resolveWith: ((result: IBulkInviteResult | null) => void) | null = null;
  public modal: plugins.deesCatalog.DeesModal | null = null;

  public static styles = [
    cssManager.defaultStyles,
    accountDesignTokens,
    css`
      :host {
        display: block;
      }

      .description {
        color: var(--muted-foreground);
        font-size: 14px;
        margin-bottom: 20px;
      }

      .file-upload-area {
        border: 2px dashed var(--border);
        border-radius: 12px;
        padding: 32px;
        text-align: center;
        cursor: pointer;
        transition: all 0.15s ease;
        margin-bottom: 20px;
      }

      .file-upload-area:hover {
        border-color: var(--muted-foreground);
        background: var(--muted);
      }

      .file-upload-area.has-data {
        border-style: solid;
        border-color: #22c55e;
        background: rgba(34, 197, 94, 0.05);
      }

      .upload-icon {
        font-size: 32px;
        color: var(--muted-foreground);
        margin-bottom: 12px;
      }

      .upload-text {
        font-size: 14px;
        color: var(--foreground);
        margin-bottom: 4px;
      }

      .upload-hint {
        font-size: 12px;
        color: var(--muted-foreground);
      }

      .sample-link {
        color: #3b82f6;
        cursor: pointer;
        text-decoration: underline;
      }

      input[type="file"] {
        display: none;
      }

      .preview-section {
        margin-bottom: 20px;
      }

      .preview-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 12px;
      }

      .preview-title {
        font-size: 13px;
        font-weight: 600;
        color: var(--foreground);
      }

      .preview-stats {
        font-size: 12px;
        color: var(--muted-foreground);
      }

      .preview-stats .valid {
        color: #22c55e;
      }

      .preview-stats .invalid {
        color: #ef4444;
      }

      .preview-list {
        max-height: 200px;
        overflow-y: auto;
        border: 1px solid var(--border);
        border-radius: 8px;
      }

      .preview-item {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 10px 14px;
        border-bottom: 1px solid var(--border);
        font-size: 13px;
      }

      .preview-item:last-child {
        border-bottom: none;
      }

      .preview-item.invalid {
        background: rgba(239, 68, 68, 0.05);
      }

      .preview-email {
        color: var(--foreground);
      }

      .preview-status {
        font-size: 11px;
        padding: 2px 8px;
        border-radius: 4px;
      }

      .preview-status.valid {
        background: rgba(34, 197, 94, 0.2);
        color: #22c55e;
      }

      .preview-status.invalid {
        background: rgba(239, 68, 68, 0.2);
        color: #ef4444;
      }

      .role-section {
        margin-bottom: 20px;
      }

      .section-label {
        font-size: 13px;
        font-weight: 500;
        color: var(--foreground);
        margin-bottom: 10px;
      }

      .role-selector {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
      }

      .role-option {
        padding: 8px 16px;
        border-radius: 8px;
        font-size: 13px;
        font-weight: 500;
        border: 1px solid var(--border);
        background: transparent;
        color: var(--muted-foreground);
        cursor: pointer;
        transition: all 0.15s ease;
      }

      .role-option:hover {
        border-color: var(--foreground);
        color: var(--foreground);
      }

      .role-option.selected {
        border-color: #3b82f6;
        background: rgba(59, 130, 246, 0.1);
        color: #3b82f6;
      }

      .error-message {
        padding: 12px 16px;
        background: rgba(239, 68, 68, 0.1);
        border: 1px solid rgba(239, 68, 68, 0.3);
        border-radius: 8px;
        color: #ef4444;
        font-size: 13px;
        margin-bottom: 16px;
      }

      .results-section {
        padding: 16px;
        background: rgba(34, 197, 94, 0.1);
        border: 1px solid rgba(34, 197, 94, 0.3);
        border-radius: 8px;
        margin-bottom: 16px;
      }

      .results-section.has-failures {
        background: rgba(234, 179, 8, 0.1);
        border-color: rgba(234, 179, 8, 0.3);
      }

      .results-title {
        font-weight: 600;
        margin-bottom: 8px;
        color: var(--foreground);
      }

      .results-stats {
        font-size: 13px;
        color: var(--muted-foreground);
      }

      .clear-button {
        font-size: 12px;
        color: #ef4444;
        background: none;
        border: none;
        cursor: pointer;
        padding: 4px 8px;
      }

      .clear-button:hover {
        text-decoration: underline;
      }
    `,
  ];

  public render(): TemplateResult {
    if (this.results) {
      return this.renderResults();
    }

    return html`
      <div class="description">
        Upload a CSV file with email addresses to invite multiple people at once.
      </div>

      ${this.error ? html`
        <div class="error-message">${this.error}</div>
      ` : ''}

      ${this.renderFileUpload()}
      ${this.parsedEmails.length > 0 ? this.renderPreview() : ''}
      ${this.parsedEmails.length > 0 ? this.renderRoleSelector() : ''}
    `;
  }

  private renderFileUpload(): TemplateResult {
    const validCount = this.parsedEmails.filter(e => e.valid).length;
    const hasData = this.parsedEmails.length > 0;

    return html`
      <div
        class="file-upload-area ${hasData ? 'has-data' : ''}"
        @click=${() => this.triggerFileInput()}
        @dragover=${(e: DragEvent) => { e.preventDefault(); }}
        @drop=${(e: DragEvent) => this.handleFileDrop(e)}
      >
        <input
          type="file"
          accept=".csv,.txt"
          @change=${(e: Event) => this.handleFileSelect(e)}
        />
        ${hasData ? html`
          <div class="upload-icon">
            <dees-icon .icon=${'lucide:check-circle'}></dees-icon>
          </div>
          <div class="upload-text">${validCount} valid email(s) loaded</div>
          <div class="upload-hint">Click to replace with a different file</div>
        ` : html`
          <div class="upload-icon">
            <dees-icon .icon=${'lucide:upload'}></dees-icon>
          </div>
          <div class="upload-text">Drop CSV file here or click to browse</div>
          <div class="upload-hint">
            <span class="sample-link" @click=${(e: Event) => { e.stopPropagation(); this.downloadSampleCSV(); }}>Download sample CSV</span>
          </div>
        `}
      </div>
    `;
  }

  private renderPreview(): TemplateResult {
    const validCount = this.parsedEmails.filter(e => e.valid).length;
    const invalidCount = this.parsedEmails.filter(e => !e.valid).length;

    return html`
      <div class="preview-section">
        <div class="preview-header">
          <span class="preview-title">Email Preview</span>
          <span class="preview-stats">
            <span class="valid">${validCount} valid</span>
            ${invalidCount > 0 ? html`, <span class="invalid">${invalidCount} invalid</span>` : ''}
          </span>
          <button class="clear-button" @click=${() => this.clearEmails()}>Clear</button>
        </div>
        <div class="preview-list">
          ${this.parsedEmails.map(item => html`
            <div class="preview-item ${item.valid ? '' : 'invalid'}">
              <span class="preview-email">${item.email}</span>
              <span class="preview-status ${item.valid ? 'valid' : 'invalid'}">
                ${item.valid ? 'Valid' : (item.error || 'Invalid')}
              </span>
            </div>
          `)}
        </div>
      </div>
    `;
  }

  private renderRoleSelector(): TemplateResult {
    return html`
      <div class="role-section">
        <div class="section-label">Assign Role</div>
        <div class="role-selector">
          ${BulkInviteForm.AVAILABLE_ROLES.map(role => html`
            <button
              class="role-option ${this.selectedRoles.includes(role) ? 'selected' : ''}"
              @click=${() => this.toggleRole(role)}
              ?disabled=${this.submitting}
            >
              ${role}
            </button>
          `)}
        </div>
      </div>
    `;
  }

  private renderResults(): TemplateResult {
    const hasFailures = this.results!.failedCount > 0 || this.results!.alreadyMemberCount > 0;

    return html`
      <div class="results-section ${hasFailures ? 'has-failures' : ''}">
        <div class="results-title">Bulk Invite Complete</div>
        <div class="results-stats">
          ${this.results!.invitedCount} invitation(s) sent successfully.
          ${this.results!.alreadyMemberCount > 0 ? html`<br>${this.results!.alreadyMemberCount} already member(s).` : ''}
          ${this.results!.failedCount > 0 ? html`<br>${this.results!.failedCount} failed.` : ''}
        </div>
      </div>
    `;
  }

  private triggerFileInput(): void {
    const input = this.shadowRoot?.querySelector('input[type="file"]') as HTMLInputElement;
    input?.click();
  }

  private handleFileDrop(e: DragEvent): void {
    e.preventDefault();
    const file = e.dataTransfer?.files[0];
    if (file) {
      this.parseCSVFile(file);
    }
  }

  private handleFileSelect(e: Event): void {
    const input = e.target as HTMLInputElement;
    const file = input.files?.[0];
    if (file) {
      this.parseCSVFile(file);
    }
  }

  private async parseCSVFile(file: File): Promise<void> {
    const text = await file.text();
    const lines = text.split(/\r?\n/).filter(line => line.trim());

    const parsed: IParsedEmail[] = [];
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    const seen = new Set<string>();

    for (let i = 0; i < lines.length; i++) {
      const line = lines[i].trim();

      // Skip header row if it looks like "email" or similar
      if (i === 0 && (line.toLowerCase() === 'email' || line.toLowerCase() === 'emails' || line.toLowerCase() === 'e-mail')) {
        continue;
      }

      // Extract email from line (handle quoted values, commas)
      const email = line.replace(/["']/g, '').split(',')[0].trim().toLowerCase();

      if (!email) {
        continue;
      }

      if (seen.has(email)) {
        parsed.push({ email, valid: false, error: 'Duplicate' });
        continue;
      }
      seen.add(email);

      if (!emailRegex.test(email)) {
        parsed.push({ email, valid: false, error: 'Invalid format' });
        continue;
      }

      parsed.push({ email, valid: true });
    }

    this.parsedEmails = parsed;
    this.error = '';
  }

  private downloadSampleCSV(): void {
    const content = 'email\nuser1@example.com\nuser2@example.com\nuser3@example.com';
    const blob = new Blob([content], { type: 'text/csv' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'sample-invite-list.csv';
    a.click();
    URL.revokeObjectURL(url);
  }

  private clearEmails(): void {
    this.parsedEmails = [];
    this.error = '';
  }

  private toggleRole(role: string): void {
    if (this.selectedRoles.includes(role)) {
      this.selectedRoles = this.selectedRoles.filter(r => r !== role);
    } else {
      this.selectedRoles = [...this.selectedRoles, role];
    }
    if (this.selectedRoles.length === 0) {
      this.selectedRoles = ['viewer'];
    }
  }

  public canSubmit(): boolean {
    const validEmails = this.parsedEmails.filter(e => e.valid);
    return validEmails.length > 0 && this.selectedRoles.length > 0 && !this.submitting && !this.results;
  }

  public async handleSubmit(): Promise<IBulkInviteResult | null> {
    if (!this.canSubmit()) {
      return null;
    }

    this.submitting = true;
    this.error = '';

    try {
      const idpState = await IdpState.getSingletonInstance();
      const jwt = await idpState.idpClient.getJwt();

      const validEmails = this.parsedEmails.filter(e => e.valid);

      const request = idpState.idpClient.typedsocket.createTypedRequest<plugins.idpInterfaces.request.IReq_BulkCreateInvitations>(
        'bulkCreateInvitations'
      );

      const response = await request.fire({
        jwt,
        organizationId: this.organizationId,
        invitations: validEmails.map(e => ({ email: e.email })),
        defaultRoles: this.selectedRoles,
      });

      this.results = {
        invitedCount: response.summary.invited,
        failedCount: response.summary.errors + response.summary.invalid,
        alreadyMemberCount: response.summary.alreadyMembers,
      };

      return this.results;
    } catch (error) {
      console.error('Error sending bulk invitations:', error);
      this.error = error instanceof Error ? error.message : 'Failed to send invitations. Please try again.';
      return null;
    } finally {
      this.submitting = false;
    }
  }

  public handleCancel(): void {
    this.modal?.destroy();
    this.resolveWith?.(null);
  }

  public handleClose(): void {
    this.modal?.destroy();
    this.resolveWith?.(this.results);
  }
}

// Export the modal utility class
export class BulkInviteModal {
  public static async show(options: {
    organizationId: string;
    organizationName: string;
  }): Promise<IBulkInviteResult | null> {
    return new Promise<IBulkInviteResult | null>((resolve) => {
      const formElement = new BulkInviteForm();
      formElement.organizationId = options.organizationId;
      formElement.organizationName = options.organizationName;
      formElement.resolveWith = resolve;

      plugins.deesCatalog.DeesModal.createAndShow({
        heading: 'Bulk Invite Members',
        content: html`${formElement}`,
        menuOptions: [
          {
            name: 'Cancel',
            action: async () => {
              formElement.handleCancel();
            },
          },
          {
            name: 'Send Invitations',
            action: async () => {
              const result = await formElement.handleSubmit();
              if (result) {
                // Wait a bit for user to see results, then close
                setTimeout(() => {
                  formElement.handleClose();
                }, 2000);
              }
            },
          },
        ],
        width: 520,
      }).then((modal) => {
        formElement.modal = modal;
      });
    });
  }
}