import { Component, signal } from '@angular/core';
import { CommonModule } from '@angular/common';

interface Endpoint {
  method: 'GET' | 'POST' | 'PATCH' | 'DELETE';
  path: string;
  description: string;
  auth: boolean;
  body?: string;
  response?: string;
}

interface ApiGroup {
  id: string;
  title: string;
  tag: string;
  tagColor: string;
  baseUrl: string;
  endpoints: Endpoint[];
}

@Component({
  selector: 'app-api',
  standalone: true,
  imports: [CommonModule],
  template: `
    <div class="api-page">

      <!-- Header -->
      <div class="api-header">
        <div class="api-header-content">
          <div class="api-eyebrow">
            <span class="version-pill">v1.0</span>
            <span class="rest-pill">REST API</span>
          </div>
          <h1>API Reference</h1>
          <p>Base URL: <code class="base-url">https://api.medicode.io/v1</code></p>
          <p class="api-subtitle">All endpoints require JWT authentication via Bearer token unless stated otherwise.</p>
        </div>
        <div class="auth-card">
          <div class="auth-card-title">
            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="16" height="16">
              <rect x="3" y="11" width="18" height="11" rx="2" ry="2"/>
              <path d="M7 11V7a5 5 0 0 1 10 0v4"/>
            </svg>
            Authentication
          </div>
          <code class="auth-snippet">Authorization: Bearer &lt;your_token&gt;</code>
          <div class="auth-note">Obtain a token via <strong>POST /auth/login</strong></div>
        </div>
      </div>

      <!-- Body -->
      <div class="api-body">

        <!-- Sidebar -->
        <aside class="api-sidebar">
          <div class="sidebar-section-title">Endpoints</div>
          @for (g of groups; track g.id) {
            <div
              class="sidebar-group"
              [class.active]="activeGroup() === g.id"
              (click)="setGroup(g.id)"
            >
              <span class="sidebar-tag" [class]="'tag-' + g.tagColor">{{ g.tag }}</span>
              <span class="sidebar-label">{{ g.title }}</span>
            </div>
          }

          <div class="sidebar-divider"></div>
          <div class="sidebar-section-title">Resources</div>
          <a class="sidebar-link" href="#">Postman Collection</a>
          <a class="sidebar-link" href="#">OpenAPI Spec</a>
          <a class="sidebar-link" href="#">Rate Limits</a>
          <a class="sidebar-link" href="#">Error Codes</a>
        </aside>

        <!-- Main panel -->
        <div class="api-main">
          @for (g of groups; track g.id) {
            @if (activeGroup() === g.id) {
              <div class="group-header">
                <span class="group-tag" [class]="'tag-' + g.tagColor">{{ g.tag }}</span>
                <div>
                  <h2>{{ g.title }}</h2>
                  <code class="group-base">{{ g.baseUrl }}</code>
                </div>
              </div>

              @for (ep of g.endpoints; track ep.path) {
                <div class="endpoint-card" [class.open]="isOpen(g.id + ep.path)" (click)="toggle(g.id + ep.path)">
                  <div class="endpoint-row">
                    <span class="method" [class]="'method-' + ep.method.toLowerCase()">{{ ep.method }}</span>
                    <code class="ep-path">{{ ep.path }}</code>
                    <span class="ep-desc">{{ ep.description }}</span>
                    @if (ep.auth) {
                      <svg class="lock-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                        <rect x="3" y="11" width="18" height="11" rx="2" ry="2"/>
                        <path d="M7 11V7a5 5 0 0 1 10 0v4"/>
                      </svg>
                    }
                    <svg class="chevron" [class.rotated]="isOpen(g.id + ep.path)" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                      <polyline points="6 9 12 15 18 9"/>
                    </svg>
                  </div>

                  @if (isOpen(g.id + ep.path)) {
                    <div class="endpoint-body" (click)="$event.stopPropagation()">
                      @if (ep.body) {
                        <div class="code-block-wrap">
                          <div class="code-block-label">
                            <span>Request Body</span>
                            <button class="copy-btn" (click)="copy(ep.body!)">Copy</button>
                          </div>
                          <pre class="code-block"><code>{{ ep.body }}</code></pre>
                        </div>
                      }
                      @if (ep.response) {
                        <div class="code-block-wrap">
                          <div class="code-block-label">
                            <span>Response <span class="status-200">200 OK</span></span>
                            <button class="copy-btn" (click)="copy(ep.response!)">Copy</button>
                          </div>
                          <pre class="code-block"><code>{{ ep.response }}</code></pre>
                        </div>
                      }
                    </div>
                  }
                </div>
              }
            }
          }
        </div>
      </div>
    </div>
  `,
  styles: [`
    .api-page {
      max-width: 1400px;
      margin: 0 auto;
      font-family: 'Inter', system-ui, sans-serif;
    }

    /* ── Header ────────────────────────────────────── */
    .api-header {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 2rem;
      padding: 2.5rem 2rem 2rem;
      background: #0f172a;
      flex-wrap: wrap;
    }

    .api-eyebrow { display: flex; gap: 0.5rem; margin-bottom: 0.75rem; }

    .version-pill, .rest-pill {
      font-size: 0.7rem;
      font-weight: 700;
      padding: 0.2rem 0.6rem;
      border-radius: 99px;
      letter-spacing: 0.05em;
    }
    .version-pill { background: #1e293b; color: #94a3b8; border: 1px solid #334155; }
    .rest-pill    { background: rgba(14,165,233,0.15); color: #38bdf8; border: 1px solid rgba(14,165,233,0.3); }

    .api-header h1 {
      font-size: 1.75rem;
      font-weight: 800;
      color: #f8fafc;
      margin: 0 0 0.5rem;
      letter-spacing: -0.02em;
    }

    .base-url {
      background: #1e293b;
      color: #38bdf8;
      padding: 0.2rem 0.6rem;
      border-radius: 5px;
      font-size: 0.875rem;
    }

    .api-subtitle { font-size: 0.85rem; color: #64748b; margin: 0.5rem 0 0; }

    /* Auth card */
    .auth-card {
      background: #1e293b;
      border: 1px solid #334155;
      border-radius: 12px;
      padding: 1.25rem 1.5rem;
      min-width: 280px;
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }
    .auth-card-title {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.8rem;
      font-weight: 700;
      color: #94a3b8;
      text-transform: uppercase;
      letter-spacing: 0.07em;
    }
    .auth-snippet {
      display: block;
      background: #0f172a;
      color: #38bdf8;
      padding: 0.6rem 0.85rem;
      border-radius: 7px;
      font-size: 0.8rem;
      border: 1px solid #334155;
    }
    .auth-note { font-size: 0.78rem; color: #64748b; }
    .auth-note strong { color: #94a3b8; }

    /* ── Body ──────────────────────────────────────── */
    .api-body {
      display: grid;
      grid-template-columns: 220px 1fr;
      gap: 0;
      min-height: calc(100vh - 200px);
    }

    /* Sidebar */
    .api-sidebar {
      background: #f8fafc;
      border-right: 1px solid #e2e8f0;
      padding: 1.5rem 1rem;
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
      position: sticky;
      top: 0;
      align-self: start;
      height: 100vh;
      overflow-y: auto;
    }

    .sidebar-section-title {
      font-size: 0.68rem;
      font-weight: 700;
      color: #94a3b8;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      padding: 0.25rem 0.5rem;
      margin-bottom: 0.25rem;
    }

    .sidebar-group {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      padding: 0.5rem 0.75rem;
      border-radius: 7px;
      cursor: pointer;
      transition: background 0.12s;
    }
    .sidebar-group:hover { background: #e2e8f0; }
    .sidebar-group.active { background: #e0f2fe; }
    .sidebar-group.active .sidebar-label { color: #0369a1; font-weight: 600; }

    .sidebar-label { font-size: 0.85rem; color: #374151; }

    .sidebar-tag {
      font-size: 0.62rem;
      font-weight: 700;
      padding: 0.15rem 0.4rem;
      border-radius: 4px;
      flex-shrink: 0;
    }
    .tag-blue   { background: #eff6ff; color: #1d4ed8; }
    .tag-green  { background: #f0fdf4; color: #15803d; }
    .tag-purple { background: #faf5ff; color: #7c3aed; }
    .tag-sky    { background: #f0f9ff; color: #0369a1; }
    .tag-orange { background: #fff7ed; color: #c2410c; }

    .sidebar-divider { height: 1px; background: #e2e8f0; margin: 0.75rem 0; }

    .sidebar-link {
      font-size: 0.82rem;
      color: #64748b;
      text-decoration: none;
      padding: 0.35rem 0.75rem;
      border-radius: 6px;
      transition: all 0.12s;
    }
    .sidebar-link:hover { background: #e2e8f0; color: #0f172a; }

    /* Main */
    .api-main { padding: 2rem; display: flex; flex-direction: column; gap: 1rem; }

    .group-header {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 0.5rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid #e2e8f0;
    }
    .group-tag {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.3rem 0.75rem;
      border-radius: 6px;
    }
    .group-header h2 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #0f172a;
      margin: 0 0 0.15rem;
    }
    .group-base {
      font-size: 0.78rem;
      color: #64748b;
      background: #f1f5f9;
      padding: 0.1rem 0.4rem;
      border-radius: 4px;
    }

    /* Endpoint cards */
    .endpoint-card {
      background: white;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      overflow: hidden;
      cursor: pointer;
      transition: border-color 0.15s, box-shadow 0.15s;
    }
    .endpoint-card:hover { border-color: #0EA5E9; box-shadow: 0 0 0 3px rgba(14,165,233,0.07); }

    .endpoint-row {
      display: flex;
      align-items: center;
      gap: 0.85rem;
      padding: 0.85rem 1.1rem;
    }

    .method {
      font-size: 0.7rem;
      font-weight: 800;
      padding: 0.25rem 0.55rem;
      border-radius: 5px;
      letter-spacing: 0.05em;
      flex-shrink: 0;
      min-width: 52px;
      text-align: center;
    }
    .method-get    { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }
    .method-post   { background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; }
    .method-patch  { background: #fff7ed; color: #c2410c; border: 1px solid #fed7aa; }
    .method-delete { background: #fff1f2; color: #be123c; border: 1px solid #fecdd3; }

    .ep-path {
      font-size: 0.88rem;
      color: #1e293b;
      font-family: 'Fira Code', 'Consolas', monospace;
      flex-shrink: 0;
    }
    .ep-desc { font-size: 0.82rem; color: #64748b; }

    .lock-icon { width: 14px; height: 14px; color: #94a3b8; margin-left: auto; flex-shrink: 0; }

    .chevron {
      width: 16px;
      height: 16px;
      color: #94a3b8;
      flex-shrink: 0;
      transition: transform 0.2s;
      margin-left: auto;
    }
    .chevron.rotated { transform: rotate(180deg); }
    .lock-icon + .chevron { margin-left: 0; }

    /* Expanded body */
    .endpoint-body {
      border-top: 1px solid #f1f5f9;
      padding: 1.1rem;
      background: #fafafa;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .code-block-wrap { display: flex; flex-direction: column; gap: 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2e8f0; }

    .code-block-label {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #f1f5f9;
      padding: 0.5rem 0.85rem;
      font-size: 0.75rem;
      font-weight: 600;
      color: #64748b;
      border-bottom: 1px solid #e2e8f0;
    }

    .status-200 {
      background: #f0fdf4;
      color: #15803d;
      padding: 0.1rem 0.4rem;
      border-radius: 4px;
      font-size: 0.68rem;
      margin-left: 0.4rem;
    }

    .copy-btn {
      background: none;
      border: 1px solid #e2e8f0;
      border-radius: 5px;
      font-size: 0.7rem;
      color: #64748b;
      padding: 0.15rem 0.5rem;
      cursor: pointer;
      transition: all 0.12s;
    }
    .copy-btn:hover { border-color: #0EA5E9; color: #0EA5E9; background: #f0f9ff; }

    .code-block {
      background: #0f172a;
      color: #e2e8f0;
      margin: 0;
      padding: 1rem 1.1rem;
      font-size: 0.8rem;
      font-family: 'Fira Code', 'Consolas', monospace;
      overflow-x: auto;
      line-height: 1.6;
    }

    @media (max-width: 900px) {
      .api-body { grid-template-columns: 1fr; }
      .api-sidebar { display: none; }
    }
  `],
})
export class ApiReferenceComponent {
  activeGroup = signal('auth');
  openCards = signal<Set<string>>(new Set());

  setGroup(id: string) { this.activeGroup.set(id); }

  toggle(key: string) {
    const s = new Set(this.openCards());
    s.has(key) ? s.delete(key) : s.add(key);
    this.openCards.set(s);
  }

  isOpen(key: string) { return this.openCards().has(key); }

  copy(text: string) { navigator.clipboard.writeText(text); }

  groups: ApiGroup[] = [
    {
      id: 'auth',
      title: 'Authentication',
      tag: 'AUTH',
      tagColor: 'purple',
      baseUrl: '/auth',
      endpoints: [
        {
          method: 'POST',
          path: '/auth/register',
          description: 'Register a new user account',
          auth: false,
          body: `{
  "name": "Jane Doe",
  "email": "jane@clinic.com",
  "password": "securepass123",
  "role": "coder"
}`,
          response: `{
  "message": "User registered successfully",
  "user": {
    "_id": "64f3a...",
    "name": "Jane Doe",
    "email": "jane@clinic.com",
    "role": "coder"
  }
}`,
        },
        {
          method: 'POST',
          path: '/auth/login',
          description: 'Authenticate and receive JWT token',
          auth: false,
          body: `{
  "email": "jane@clinic.com",
  "password": "securepass123"
}`,
          response: `{
  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
  "user": {
    "_id": "64f3a...",
    "name": "Jane Doe",
    "role": "coder"
  }
}`,
        },
        {
          method: 'GET',
          path: '/auth/profile',
          description: 'Get authenticated user profile',
          auth: true,
          response: `{
  "_id": "64f3a...",
  "name": "Jane Doe",
  "email": "jane@clinic.com",
  "role": "coder",
  "createdAt": "2024-01-15T10:30:00Z"
}`,
        },
      ],
    },
    {
      id: 'patients',
      title: 'Patients',
      tag: 'PATIENTS',
      tagColor: 'blue',
      baseUrl: '/patients',
      endpoints: [
        {
          method: 'GET',
          path: '/patients',
          description: 'List all patients (paginated)',
          auth: true,
          response: `{
  "data": [
    {
      "_id": "64f3b...",
      "firstName": "John",
      "lastName": "Smith",
      "dob": "1985-04-12",
      "mrn": "MRN-001"
    }
  ],
  "total": 120,
  "page": 1,
  "limit": 20
}`,
        },
        {
          method: 'POST',
          path: '/patients',
          description: 'Create a new patient record',
          auth: true,
          body: `{
  "firstName": "John",
  "lastName": "Smith",
  "dob": "1985-04-12",
  "gender": "male",
  "mrn": "MRN-001",
  "phone": "+1-305-555-0100"
}`,
          response: `{
  "_id": "64f3b...",
  "firstName": "John",
  "lastName": "Smith",
  "mrn": "MRN-001",
  "createdAt": "2024-01-15T11:00:00Z"
}`,
        },
        {
          method: 'GET',
          path: '/patients/:id',
          description: 'Get a single patient by ID',
          auth: true,
          response: `{
  "_id": "64f3b...",
  "firstName": "John",
  "lastName": "Smith",
  "encounters": [ { "_id": "64f4c...", "status": "coded" } ]
}`,
        },
        {
          method: 'PATCH',
          path: '/patients/:id',
          description: 'Update patient information',
          auth: true,
          body: `{
  "phone": "+1-305-555-0199",
  "address": "123 Medical Blvd, Miami FL"
}`,
        },
        {
          method: 'DELETE',
          path: '/patients/:id',
          description: 'Delete a patient record',
          auth: true,
          response: `{ "message": "Patient deleted successfully" }`,
        },
      ],
    },
    {
      id: 'encounters',
      title: 'Encounters',
      tag: 'ENCOUNTERS',
      tagColor: 'green',
      baseUrl: '/patients/:id/encounters',
      endpoints: [
        {
          method: 'GET',
          path: '/patients/:id/encounters',
          description: 'List all encounters for a patient',
          auth: true,
          response: `[
  {
    "_id": "64f4c...",
    "date": "2024-01-10",
    "status": "coded",
    "icd10Codes": ["J06.9", "Z00.00"],
    "cptCodes": ["99213"]
  }
]`,
        },
        {
          method: 'POST',
          path: '/patients/:id/encounters',
          description: 'Create a new encounter',
          auth: true,
          body: `{
  "date": "2024-01-10",
  "notes": "Routine checkup",
  "icd10Codes": ["Z00.00"],
  "cptCodes": ["99213"]
}`,
        },
        {
          method: 'PATCH',
          path: '/patients/:id/encounters/:eid',
          description: 'Update encounter codes or status',
          auth: true,
          body: `{
  "status": "billed",
  "icd10Codes": ["J06.9", "Z00.00"],
  "cptCodes": ["99213", "36415"]
}`,
        },
      ],
    },
    {
      id: 'codes',
      title: 'Code Search',
      tag: 'CODES',
      tagColor: 'sky',
      baseUrl: '/codes',
      endpoints: [
        {
          method: 'GET',
          path: '/codes/icd10?q=diabetes',
          description: 'Search ICD-10-CM diagnostic codes',
          auth: true,
          response: `[
  {
    "code": "E11.9",
    "description": "Type 2 diabetes mellitus without complications",
    "category": "Endocrine"
  },
  {
    "code": "E10.9",
    "description": "Type 1 diabetes mellitus without complications",
    "category": "Endocrine"
  }
]`,
        },
        {
          method: 'GET',
          path: '/codes/cpt?q=office+visit',
          description: 'Search CPT procedure codes',
          auth: true,
          response: `[
  {
    "code": "99213",
    "description": "Office or other outpatient visit, established patient, low complexity",
    "category": "E&M"
  }
]`,
        },
      ],
    },
    {
      id: 'reports',
      title: 'Reports',
      tag: 'REPORTS',
      tagColor: 'orange',
      baseUrl: '/reports',
      endpoints: [
        {
          method: 'GET',
          path: '/reports/encounters-by-month',
          description: 'Encounters grouped by month',
          auth: true,
          response: `[
  { "_id": "2024-01", "count": 34 },
  { "_id": "2024-02", "count": 51 }
]`,
        },
        {
          method: 'GET',
          path: '/reports/top-diagnoses?limit=10',
          description: 'Most used ICD-10 codes',
          auth: true,
          response: `[
  { "_id": "J06.9", "description": "Acute upper respiratory infection", "count": 42 }
]`,
        },
        {
          method: 'GET',
          path: '/reports/top-procedures?limit=10',
          description: 'Most used CPT codes',
          auth: true,
        },
        {
          method: 'GET',
          path: '/reports/export/pdf',
          description: 'Export full report as PDF',
          auth: true,
        },
        {
          method: 'GET',
          path: '/reports/export/excel',
          description: 'Export full report as Excel',
          auth: true,
        },
      ],
    },
  ];
}