/**
 * @file sdig-contract-terms.ts
 * @description Contract terms editor - tabbed container for financial, time, and obligation terms
 */

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

import * as plugins from '../../plugins.js';

declare global {
  interface HTMLElementTagNameMap {
    'sdig-contract-terms': SdigContractTerms;
  }
}

// Term types
type TTermTab = 'financial' | 'time' | 'obligations';

interface ITermTabConfig {
  id: TTermTab;
  label: string;
  icon: string;
  description: string;
}

const TERM_TABS: ITermTabConfig[] = [
  { id: 'financial', label: 'Financial Terms', icon: 'lucide:banknote', description: 'Payment schedules, rates, and penalties' },
  { id: 'time', label: 'Time Terms', icon: 'lucide:calendar', description: 'Milestones, deadlines, and renewal' },
  { id: 'obligations', label: 'Obligations', icon: 'lucide:check-square', description: 'Deliverables, SLAs, and warranties' },
];

// Extended contract terms interfaces (for future interface updates)
interface IPaymentScheduleItem {
  id: string;
  description: string;
  amount: number;
  currency: string;
  dueDate: string;
  status: 'pending' | 'paid' | 'overdue';
}

interface IMilestone {
  id: string;
  name: string;
  description: string;
  dueDate: string;
  status: 'pending' | 'in_progress' | 'completed' | 'delayed';
  dependencies: string[];
}

interface IObligation {
  id: string;
  description: string;
  responsibleParty: string;
  deadline: string;
  status: 'pending' | 'completed' | 'waived';
}

@customElement('sdig-contract-terms')
export class SdigContractTerms extends DeesElement {
  // ============================================================================
  // STATIC
  // ============================================================================

  public static demo = () => html`
    <sdig-contract-terms
      .contract=${plugins.sdDemodata.demoContract}
    ></sdig-contract-terms>
  `;

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

      .terms-container {
        display: flex;
        flex-direction: column;
        gap: 16px;
      }

      /* Section card */
      .section-card {
        background: ${cssManager.bdTheme('#ffffff', '#0a0a0a')};
        border: 1px solid ${cssManager.bdTheme('#e5e5e5', '#27272a')};
        border-radius: 12px;
        overflow: hidden;
      }

      /* Tab navigation */
      .tabs-nav {
        display: flex;
        border-bottom: 1px solid ${cssManager.bdTheme('#e5e5e5', '#27272a')};
        background: ${cssManager.bdTheme('#f9fafb', '#111111')};
      }

      .tab-btn {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 16px 24px;
        font-size: 14px;
        font-weight: 500;
        color: ${cssManager.bdTheme('#6b7280', '#9ca3af')};
        background: transparent;
        border: none;
        border-bottom: 2px solid transparent;
        cursor: pointer;
        transition: all 0.15s ease;
      }

      .tab-btn:hover {
        color: ${cssManager.bdTheme('#374151', '#d1d5db')};
        background: ${cssManager.bdTheme('#f3f4f6', '#18181b')};
      }

      .tab-btn.active {
        color: ${cssManager.bdTheme('#111111', '#fafafa')};
        border-bottom-color: ${cssManager.bdTheme('#111111', '#fafafa')};
        background: ${cssManager.bdTheme('#ffffff', '#0a0a0a')};
      }

      .tab-btn dees-icon {
        font-size: 16px;
      }

      /* Tab content */
      .tab-content {
        padding: 24px;
      }

      /* Sub-sections */
      .sub-section {
        margin-bottom: 24px;
      }

      .sub-section:last-child {
        margin-bottom: 0;
      }

      .sub-section-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 16px;
      }

      .sub-section-title {
        font-size: 16px;
        font-weight: 600;
        color: ${cssManager.bdTheme('#111111', '#fafafa')};
      }

      .sub-section-description {
        font-size: 13px;
        color: ${cssManager.bdTheme('#6b7280', '#9ca3af')};
        margin-top: 4px;
      }

      /* Form groups */
      .form-row {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 16px;
        margin-bottom: 16px;
      }

      .form-group {
        display: flex;
        flex-direction: column;
        gap: 6px;
      }

      .form-label {
        font-size: 13px;
        font-weight: 500;
        color: ${cssManager.bdTheme('#374151', '#d1d5db')};
      }

      .form-input {
        padding: 10px 12px;
        font-size: 14px;
        color: ${cssManager.bdTheme('#111111', '#fafafa')};
        background: ${cssManager.bdTheme('#ffffff', '#0a0a0a')};
        border: 1px solid ${cssManager.bdTheme('#d1d5db', '#3f3f46')};
        border-radius: 6px;
        outline: none;
        transition: border-color 0.15s ease, box-shadow 0.15s ease;
      }

      .form-input:focus {
        border-color: ${cssManager.bdTheme('#3b82f6', '#60a5fa')};
        box-shadow: 0 0 0 3px ${cssManager.bdTheme('rgba(59, 130, 246, 0.1)', 'rgba(96, 165, 250, 0.1)')};
      }

      .form-input::placeholder {
        color: ${cssManager.bdTheme('#9ca3af', '#6b7280')};
      }

      select.form-input {
        cursor: pointer;
      }

      /* Data table */
      .data-table {
        width: 100%;
        border-collapse: collapse;
        font-size: 14px;
      }

      .data-table th {
        text-align: left;
        padding: 12px 16px;
        font-weight: 500;
        font-size: 12px;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: ${cssManager.bdTheme('#6b7280', '#9ca3af')};
        background: ${cssManager.bdTheme('#f9fafb', '#111111')};
        border-bottom: 1px solid ${cssManager.bdTheme('#e5e5e5', '#27272a')};
      }

      .data-table td {
        padding: 12px 16px;
        color: ${cssManager.bdTheme('#374151', '#d1d5db')};
        border-bottom: 1px solid ${cssManager.bdTheme('#e5e5e5', '#27272a')};
      }

      .data-table tr:last-child td {
        border-bottom: none;
      }

      .data-table tr:hover td {
        background: ${cssManager.bdTheme('#f9fafb', '#111111')};
      }

      /* Status badges */
      .status-badge {
        display: inline-flex;
        align-items: center;
        padding: 4px 10px;
        border-radius: 9999px;
        font-size: 12px;
        font-weight: 500;
      }

      .status-badge.pending {
        background: ${cssManager.bdTheme('#fef3c7', '#422006')};
        color: ${cssManager.bdTheme('#92400e', '#fcd34d')};
      }

      .status-badge.paid,
      .status-badge.completed {
        background: ${cssManager.bdTheme('#d1fae5', '#064e3b')};
        color: ${cssManager.bdTheme('#065f46', '#6ee7b7')};
      }

      .status-badge.overdue,
      .status-badge.delayed {
        background: ${cssManager.bdTheme('#fee2e2', '#450a0a')};
        color: ${cssManager.bdTheme('#991b1b', '#fca5a5')};
      }

      .status-badge.in_progress {
        background: ${cssManager.bdTheme('#dbeafe', '#1e3a5f')};
        color: ${cssManager.bdTheme('#1e40af', '#93c5fd')};
      }

      /* Amount display */
      .amount {
        font-weight: 600;
        font-family: 'Roboto Mono', monospace;
      }

      .amount.positive {
        color: ${cssManager.bdTheme('#059669', '#34d399')};
      }

      .amount.negative {
        color: ${cssManager.bdTheme('#dc2626', '#f87171')};
      }

      /* Summary card */
      .summary-card {
        display: flex;
        gap: 32px;
        padding: 20px;
        background: ${cssManager.bdTheme('#f9fafb', '#111111')};
        border-radius: 8px;
        margin-bottom: 24px;
      }

      .summary-item {
        display: flex;
        flex-direction: column;
        gap: 4px;
      }

      .summary-label {
        font-size: 12px;
        font-weight: 500;
        color: ${cssManager.bdTheme('#6b7280', '#9ca3af')};
        text-transform: uppercase;
        letter-spacing: 0.05em;
      }

      .summary-value {
        font-size: 24px;
        font-weight: 700;
        color: ${cssManager.bdTheme('#111111', '#fafafa')};
      }

      .summary-value.currency {
        font-family: 'Roboto Mono', monospace;
      }

      /* Empty state */
      .empty-state {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 48px 20px;
        text-align: center;
        color: ${cssManager.bdTheme('#6b7280', '#9ca3af')};
      }

      .empty-state dees-icon {
        font-size: 48px;
        margin-bottom: 16px;
        opacity: 0.5;
      }

      .empty-state h4 {
        margin: 0 0 8px;
        font-size: 16px;
        font-weight: 600;
        color: ${cssManager.bdTheme('#374151', '#d1d5db')};
      }

      .empty-state p {
        margin: 0 0 20px;
        font-size: 14px;
      }

      /* Buttons */
      .btn {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 8px 14px;
        font-size: 13px;
        font-weight: 500;
        border-radius: 6px;
        border: none;
        cursor: pointer;
        transition: all 0.15s ease;
      }

      .btn-sm {
        padding: 6px 10px;
        font-size: 12px;
      }

      .btn-primary {
        background: ${cssManager.bdTheme('#111111', '#fafafa')};
        color: ${cssManager.bdTheme('#ffffff', '#09090b')};
      }

      .btn-primary:hover {
        background: ${cssManager.bdTheme('#333333', '#e5e5e5')};
      }

      .btn-secondary {
        background: ${cssManager.bdTheme('#f3f4f6', '#27272a')};
        color: ${cssManager.bdTheme('#374151', '#d1d5db')};
      }

      .btn-secondary:hover {
        background: ${cssManager.bdTheme('#e5e7eb', '#3f3f46')};
      }

      .btn-ghost {
        background: transparent;
        color: ${cssManager.bdTheme('#6b7280', '#9ca3af')};
      }

      .btn-ghost:hover {
        background: ${cssManager.bdTheme('#f3f4f6', '#27272a')};
        color: ${cssManager.bdTheme('#111111', '#fafafa')};
      }

      /* Add row button */
      .add-row {
        display: flex;
        justify-content: center;
        padding: 16px;
        border-top: 1px dashed ${cssManager.bdTheme('#e5e5e5', '#27272a')};
      }

      /* Info banner */
      .info-banner {
        display: flex;
        align-items: flex-start;
        gap: 12px;
        padding: 16px;
        background: ${cssManager.bdTheme('#eff6ff', '#172554')};
        border: 1px solid ${cssManager.bdTheme('#bfdbfe', '#1e40af')};
        border-radius: 8px;
        margin-bottom: 24px;
      }

      .info-banner dees-icon {
        font-size: 20px;
        color: ${cssManager.bdTheme('#3b82f6', '#60a5fa')};
        flex-shrink: 0;
      }

      .info-banner-content {
        flex: 1;
      }

      .info-banner-title {
        font-size: 14px;
        font-weight: 600;
        color: ${cssManager.bdTheme('#1e40af', '#93c5fd')};
        margin-bottom: 4px;
      }

      .info-banner-text {
        font-size: 13px;
        color: ${cssManager.bdTheme('#3b82f6', '#60a5fa')};
      }
    `,
  ];

  // ============================================================================
  // PROPERTIES
  // ============================================================================

  @property({ type: Object })
  public accessor contract: plugins.sdInterfaces.IPortableContract | null = null;

  @property({ type: Boolean })
  public accessor readonly: boolean = false;

  // ============================================================================
  // STATE
  // ============================================================================

  @state()
  private accessor activeTab: TTermTab = 'financial';

  // Demo data for terms (will be replaced with actual contract data when interface is extended)
  @state()
  private accessor paymentSchedule: IPaymentScheduleItem[] = [
    { id: '1', description: 'Initial deposit', amount: 5000, currency: 'EUR', dueDate: '2024-02-01', status: 'paid' },
    { id: '2', description: 'Monthly payment - March', amount: 1000, currency: 'EUR', dueDate: '2024-03-01', status: 'paid' },
    { id: '3', description: 'Monthly payment - April', amount: 1000, currency: 'EUR', dueDate: '2024-04-01', status: 'pending' },
  ];

  @state()
  private accessor milestones: IMilestone[] = [
    { id: '1', name: 'Project Kickoff', description: 'Initial planning and setup', dueDate: '2024-02-15', status: 'completed', dependencies: [] },
    { id: '2', name: 'Phase 1 Delivery', description: 'First deliverable milestone', dueDate: '2024-03-15', status: 'in_progress', dependencies: ['1'] },
    { id: '3', name: 'Final Delivery', description: 'Complete project delivery', dueDate: '2024-05-01', status: 'pending', dependencies: ['2'] },
  ];

  @state()
  private accessor obligations: IObligation[] = [
    { id: '1', description: 'Provide access credentials', responsibleParty: 'employer', deadline: '2024-02-01', status: 'completed' },
    { id: '2', description: 'Submit monthly reports', responsibleParty: 'employee', deadline: '2024-03-01', status: 'pending' },
    { id: '3', description: 'Conduct quarterly review', responsibleParty: 'employer', deadline: '2024-04-01', status: 'pending' },
  ];

  // ============================================================================
  // EVENT HANDLERS
  // ============================================================================

  private handleFieldChange(path: string, value: unknown) {
    this.dispatchEvent(
      new CustomEvent('field-change', {
        detail: { path, value },
        bubbles: true,
        composed: true,
      })
    );
  }

  private handleTabChange(tab: TTermTab) {
    this.activeTab = tab;
  }

  private handleAddPayment() {
    const newPayment: IPaymentScheduleItem = {
      id: `pay-${Date.now()}`,
      description: 'New payment',
      amount: 0,
      currency: 'EUR',
      dueDate: new Date().toISOString().split('T')[0],
      status: 'pending',
    };
    this.paymentSchedule = [...this.paymentSchedule, newPayment];
  }

  private handleAddMilestone() {
    const newMilestone: IMilestone = {
      id: `ms-${Date.now()}`,
      name: 'New Milestone',
      description: '',
      dueDate: new Date().toISOString().split('T')[0],
      status: 'pending',
      dependencies: [],
    };
    this.milestones = [...this.milestones, newMilestone];
  }

  private handleAddObligation() {
    const newObligation: IObligation = {
      id: `obl-${Date.now()}`,
      description: 'New obligation',
      responsibleParty: '',
      deadline: new Date().toISOString().split('T')[0],
      status: 'pending',
    };
    this.obligations = [...this.obligations, newObligation];
  }

  // ============================================================================
  // HELPERS
  // ============================================================================

  private formatCurrency(amount: number, currency: string): string {
    return new Intl.NumberFormat('en-US', {
      style: 'currency',
      currency: currency,
    }).format(amount);
  }

  private formatDate(dateStr: string): string {
    return new Date(dateStr).toLocaleDateString('en-US', {
      year: 'numeric',
      month: 'short',
      day: 'numeric',
    });
  }

  private getTotalAmount(): number {
    return this.paymentSchedule.reduce((sum, p) => sum + p.amount, 0);
  }

  private getPaidAmount(): number {
    return this.paymentSchedule.filter((p) => p.status === 'paid').reduce((sum, p) => sum + p.amount, 0);
  }

  private getPartyName(roleId: string): string {
    const role = this.contract?.availableRoles.find((r) => r.id === roleId);
    return role?.name || roleId;
  }

  // ============================================================================
  // RENDER
  // ============================================================================

  public render(): TemplateResult {
    if (!this.contract) {
      return html`<div>No contract loaded</div>`;
    }

    return html`
      <div class="terms-container">
        <div class="section-card">
          <!-- Tabs Navigation -->
          <nav class="tabs-nav">
            ${TERM_TABS.map(
              (tab) => html`
                <button
                  class="tab-btn ${this.activeTab === tab.id ? 'active' : ''}"
                  @click=${() => this.handleTabChange(tab.id)}
                >
                  <dees-icon .iconFA=${tab.icon}></dees-icon>
                  ${tab.label}
                </button>
              `
            )}
          </nav>

          <!-- Tab Content -->
          <div class="tab-content">
            ${this.activeTab === 'financial'
              ? this.renderFinancialTerms()
              : this.activeTab === 'time'
              ? this.renderTimeTerms()
              : this.renderObligations()}
          </div>
        </div>
      </div>
    `;
  }

  private renderFinancialTerms(): TemplateResult {
    const totalAmount = this.getTotalAmount();
    const paidAmount = this.getPaidAmount();
    const pendingAmount = totalAmount - paidAmount;

    return html`
      <!-- Summary -->
      <div class="summary-card">
        <div class="summary-item">
          <span class="summary-label">Total Value</span>
          <span class="summary-value currency">${this.formatCurrency(totalAmount, 'EUR')}</span>
        </div>
        <div class="summary-item">
          <span class="summary-label">Paid</span>
          <span class="summary-value currency" style="color: #059669;">${this.formatCurrency(paidAmount, 'EUR')}</span>
        </div>
        <div class="summary-item">
          <span class="summary-label">Pending</span>
          <span class="summary-value currency" style="color: #f59e0b;">${this.formatCurrency(pendingAmount, 'EUR')}</span>
        </div>
      </div>

      <!-- Payment Schedule -->
      <div class="sub-section">
        <div class="sub-section-header">
          <div>
            <div class="sub-section-title">Payment Schedule</div>
            <div class="sub-section-description">Scheduled payments and their status</div>
          </div>
          ${!this.readonly
            ? html`
                <button class="btn btn-secondary" @click=${this.handleAddPayment}>
                  <dees-icon .iconFA=${'lucide:plus'}></dees-icon>
                  Add Payment
                </button>
              `
            : ''}
        </div>

        ${this.paymentSchedule.length > 0
          ? html`
              <table class="data-table">
                <thead>
                  <tr>
                    <th>Description</th>
                    <th>Amount</th>
                    <th>Due Date</th>
                    <th>Status</th>
                    ${!this.readonly ? html`<th></th>` : ''}
                  </tr>
                </thead>
                <tbody>
                  ${this.paymentSchedule.map(
                    (payment) => html`
                      <tr>
                        <td>${payment.description}</td>
                        <td><span class="amount">${this.formatCurrency(payment.amount, payment.currency)}</span></td>
                        <td>${this.formatDate(payment.dueDate)}</td>
                        <td><span class="status-badge ${payment.status}">${payment.status}</span></td>
                        ${!this.readonly
                          ? html`
                              <td>
                                <button class="btn btn-ghost btn-sm">
                                  <dees-icon .iconFA=${'lucide:pencil'}></dees-icon>
                                </button>
                              </td>
                            `
                          : ''}
                      </tr>
                    `
                  )}
                </tbody>
              </table>
            `
          : html`
              <div class="empty-state">
                <dees-icon .iconFA=${'lucide:banknote'}></dees-icon>
                <h4>No Payment Schedule</h4>
                <p>Add payment terms to track financial obligations</p>
              </div>
            `}
      </div>
    `;
  }

  private renderTimeTerms(): TemplateResult {
    const completedCount = this.milestones.filter((m) => m.status === 'completed').length;
    const totalCount = this.milestones.length;

    return html`
      <!-- Summary -->
      <div class="summary-card">
        <div class="summary-item">
          <span class="summary-label">Total Milestones</span>
          <span class="summary-value">${totalCount}</span>
        </div>
        <div class="summary-item">
          <span class="summary-label">Completed</span>
          <span class="summary-value" style="color: #059669;">${completedCount}</span>
        </div>
        <div class="summary-item">
          <span class="summary-label">Progress</span>
          <span class="summary-value">${totalCount > 0 ? Math.round((completedCount / totalCount) * 100) : 0}%</span>
        </div>
      </div>

      <!-- Milestones -->
      <div class="sub-section">
        <div class="sub-section-header">
          <div>
            <div class="sub-section-title">Milestones</div>
            <div class="sub-section-description">Key project milestones and deadlines</div>
          </div>
          ${!this.readonly
            ? html`
                <button class="btn btn-secondary" @click=${this.handleAddMilestone}>
                  <dees-icon .iconFA=${'lucide:plus'}></dees-icon>
                  Add Milestone
                </button>
              `
            : ''}
        </div>

        ${this.milestones.length > 0
          ? html`
              <table class="data-table">
                <thead>
                  <tr>
                    <th>Milestone</th>
                    <th>Description</th>
                    <th>Due Date</th>
                    <th>Status</th>
                    ${!this.readonly ? html`<th></th>` : ''}
                  </tr>
                </thead>
                <tbody>
                  ${this.milestones.map(
                    (milestone) => html`
                      <tr>
                        <td><strong>${milestone.name}</strong></td>
                        <td>${milestone.description || '—'}</td>
                        <td>${this.formatDate(milestone.dueDate)}</td>
                        <td><span class="status-badge ${milestone.status}">${milestone.status.replace('_', ' ')}</span></td>
                        ${!this.readonly
                          ? html`
                              <td>
                                <button class="btn btn-ghost btn-sm">
                                  <dees-icon .iconFA=${'lucide:pencil'}></dees-icon>
                                </button>
                              </td>
                            `
                          : ''}
                      </tr>
                    `
                  )}
                </tbody>
              </table>
            `
          : html`
              <div class="empty-state">
                <dees-icon .iconFA=${'lucide:calendar'}></dees-icon>
                <h4>No Milestones</h4>
                <p>Add milestones to track project progress</p>
              </div>
            `}
      </div>
    `;
  }

  private renderObligations(): TemplateResult {
    const completedCount = this.obligations.filter((o) => o.status === 'completed').length;

    return html`
      <!-- Summary -->
      <div class="summary-card">
        <div class="summary-item">
          <span class="summary-label">Total Obligations</span>
          <span class="summary-value">${this.obligations.length}</span>
        </div>
        <div class="summary-item">
          <span class="summary-label">Completed</span>
          <span class="summary-value" style="color: #059669;">${completedCount}</span>
        </div>
        <div class="summary-item">
          <span class="summary-label">Pending</span>
          <span class="summary-value" style="color: #f59e0b;">${this.obligations.length - completedCount}</span>
        </div>
      </div>

      <!-- Info banner -->
      <div class="info-banner">
        <dees-icon .iconFA=${'lucide:info'}></dees-icon>
        <div class="info-banner-content">
          <div class="info-banner-title">Contractual Obligations</div>
          <div class="info-banner-text">
            Track responsibilities assigned to each party. Mark obligations as completed when fulfilled.
          </div>
        </div>
      </div>

      <!-- Obligations -->
      <div class="sub-section">
        <div class="sub-section-header">
          <div>
            <div class="sub-section-title">Party Obligations</div>
            <div class="sub-section-description">Responsibilities and deliverables by party</div>
          </div>
          ${!this.readonly
            ? html`
                <button class="btn btn-secondary" @click=${this.handleAddObligation}>
                  <dees-icon .iconFA=${'lucide:plus'}></dees-icon>
                  Add Obligation
                </button>
              `
            : ''}
        </div>

        ${this.obligations.length > 0
          ? html`
              <table class="data-table">
                <thead>
                  <tr>
                    <th>Obligation</th>
                    <th>Responsible Party</th>
                    <th>Deadline</th>
                    <th>Status</th>
                    ${!this.readonly ? html`<th></th>` : ''}
                  </tr>
                </thead>
                <tbody>
                  ${this.obligations.map(
                    (obligation) => html`
                      <tr>
                        <td>${obligation.description}</td>
                        <td>${this.getPartyName(obligation.responsibleParty)}</td>
                        <td>${this.formatDate(obligation.deadline)}</td>
                        <td><span class="status-badge ${obligation.status}">${obligation.status}</span></td>
                        ${!this.readonly
                          ? html`
                              <td>
                                <button class="btn btn-ghost btn-sm">
                                  <dees-icon .iconFA=${'lucide:pencil'}></dees-icon>
                                </button>
                              </td>
                            `
                          : ''}
                      </tr>
                    `
                  )}
                </tbody>
              </table>
            `
          : html`
              <div class="empty-state">
                <dees-icon .iconFA=${'lucide:check-square'}></dees-icon>
                <h4>No Obligations</h4>
                <p>Add obligations to track party responsibilities</p>
              </div>
            `}
      </div>
    `;
  }
}