from __future__ import annotations

from ..settings import DdnsSettings
from .components import _code_window, _example_update_ips, _message_band
from .html_utils import escape, trusted
from .layout import _page, _top_nav
from .templates_public_sections import _linux_installer_section


def _render_public_home(
    settings: DdnsSettings,
    message: str | None,
    request_ip: str | None = None,
) -> str:
    base_url = settings.public_base_url.rstrip("/")
    hostname_suffix = settings.hostname_suffix or "your KarlDNS suffix"
    suffix = escape(hostname_suffix)
    demo_update_url = escape(f"{base_url}/api/v1/router/update/<secret>?myip=<ipaddr>")
    example_ipv4, _ = _example_update_ips(request_ip)
    create_demo_command = f"curl -sS '{base_url}/api/v1/router/update/<secret>?myip={example_ipv4}'"
    create_demo = f"{create_demo_command}\ngood {example_ipv4}"
    manual_demo = "\n".join(
        [
            "# explicit IPv4",
            f"curl -sS '{base_url}/api/v1/router/update/<secret>?myip={example_ipv4}'",
            "# source IP fallback",
            f"curl -sS '{base_url}/api/v1/router/update/<secret>'",
        ]
    )
    message_html = _message_band(message) if message else ""
    description = "KarlDNS is a free self-hosted Dynamic DNS service for FRITZ!Box routers, generated KarlDNS hostnames, Linux cron jobs, and home networks."
    return _page(
        "KarlDNS",
        trusted(f"""
        <main id="main">
          {_top_nav()}
          <section class="hero-band">
            <div class="container text-center d-grid justify-items-center gap-3">
              <img class="hero-logo" src="/logo.webp?v=3" alt="" width="80" height="80" decoding="async" fetchpriority="high">
              <h1>Dynamic DNS for home routers.</h1>
              <div class="install-pill mx-auto">
                <code>{demo_update_url}</code>
              </div>
              <p class="lead">KarlDNS gives you a generated DynDNS hostname under {suffix}. Add the private update URL to your router, or use it from a script.</p>
              <div class="d-flex gap-2 flex-wrap justify-content-center mt-2">
                <form method="post" action="/" class="hero-action-form" aria-label="Create a generated DynDNS hostname">
                  <button type="submit" class="btn btn-primary rounded-pill">Create hostname</button>
                </form>
                <a class="btn btn-outline-primary rounded-pill" href="#manual-updates">Manual updates</a>
              </div>
            </div>
          </section>
          {message_html}
          <section class="section section-compact">
            <div class="container narrow text-center">
              <p class="eyebrow">How it works</p>
              <h2>No account needed.</h2>
              <p class="section-copy mx-auto">Create a hostname, save the private values, register it, done.</p>
              <ol class="flow-steps" aria-label="KarlDNS setup flow">
                <li><strong>Create</strong><span>Random hostname and private links.</span></li>
                <li><strong>Save</strong><span>Copy the secrets while they are shown.</span></li>
                <li><strong>Register</strong><span>Activate the hostname when you are ready.</span></li>
                <li><strong>Update</strong><span>Router, cron, or CNAME can use it.</span></li>
              </ol>
              {_code_window(create_demo, copy_label="update example", class_name="mt-4", copy_value=create_demo_command)}
            </div>
          </section>
          <section class="section" id="manual-updates">
            <div class="container narrow text-center">
              <h2>Update from a router or script.</h2>
              <p class="lead mx-auto mt-3">Works with FRITZ!Box, curl, cron, Home Assistant, OpenWrt, pfSense, OPNsense, UniFi, MikroTik, and custom tools.</p>
              {_code_window(manual_demo, copy_label="manual update examples", class_name="manual-code text-start mt-4")}
            </div>
          </section>
          {_linux_installer_section(base_url)}
        </main>
        """),
        description=description,
        preload_logo=True,
        canonical_url=f"{base_url}/",
        image_url=f"{base_url}/social-preview.png",
        image_alt="KarlDNS landing page with private Dynamic DNS update URL",
        structured_data={
            "@context": "https://schema.org",
            "@type": "SoftwareApplication",
            "name": "KarlDNS",
            "applicationCategory": "NetworkingApplication",
            "operatingSystem": "Linux",
            "url": f"{base_url}/",
            "description": description,
            "image": f"{base_url}/social-preview.png",
            "offers": {"@type": "Offer", "price": "0", "priceCurrency": "EUR"},
            "featureList": [
                "Dynamic DNS for FRITZ!Box routers",
                "Accountless private update URLs",
                "CNAME target for external DNS names",
                "Linux cron updater",
            ],
        },
    )

def _render_privacy_page(settings: DdnsSettings) -> str:
    base_url = settings.public_base_url.rstrip("/")
    description = "Privacy and legal information for KarlDNS, including stored hostnames, update links, IP history, and cleanup behavior."
    return _page(
        "Legal and Privacy",
        trusted(f"""
        <main id="main">
          {_top_nav()}
          <section class="hero-band compact">
            <div class="container text-center d-grid justify-items-center gap-3">
              <p class="eyebrow">Legal and privacy</p>
              <h1>Privacy basics.</h1>
              <p class="lead">KarlDNS stores only the data needed to keep your hostname updated.</p>
            </div>
          </section>
          <section class="section">
            <div class="container narrow d-grid gap-4">
              <div>
                <h2>Data processed</h2>
                <p class="section-copy">KarlDNS stores hostnames, protected dashboard tokens, private update links, recent IP history, timestamps, and service events.</p>
              </div>
              <div>
                <h2>Secrets</h2>
                <p class="section-copy">Dashboard links, registration URLs, and update URLs are secrets. Anyone with them may update or manage the hostname. Dashboard lookup values are not stored as readable text.</p>
              </div>
              <div>
                <h2>Logs and retention</h2>
                <p class="section-copy">KarlDNS keeps recent update events for troubleshooting. Cleanup removes unused hostnames. Server logs may also include IP addresses and request details.</p>
              </div>
              <div>
                <h2>Contact</h2>
                <p class="section-copy">For the public KarlDNS instance, contact Karl through <a href="https://karl.fail" rel="noopener">karl.fail</a> or <a href="https://karlcom.de" rel="noopener">karlcom.de</a>.</p>
              </div>
            </div>
          </section>
        </main>
        """),
        description=description,
        canonical_url=f"{base_url}/privacy",
        image_url=f"{base_url}/social-preview.png",
        image_alt="KarlDNS legal and privacy information",
        structured_data={
            "@context": "https://schema.org",
            "@type": "WebPage",
            "name": "KarlDNS Legal and Privacy",
            "url": f"{base_url}/privacy",
            "description": description,
            "isPartOf": {
                "@type": "WebSite",
                "name": "KarlDNS",
                "url": f"{base_url}/",
            },
        },
    )


def _render_api_docs_page(settings: DdnsSettings, request_ip: str | None = None) -> str:
    base_url = settings.public_base_url.rstrip("/")
    example_ipv4, _ = _example_update_ips(request_ip)
    create_example = f"curl -sS -X POST {base_url}/api/v1/hostnames"
    register_example = f"curl -sS -X POST '{base_url}/api/v1/router/register/<karl_dashboard_secret>?myip={example_ipv4}'"
    update_example = f"curl -sS '{base_url}/api/v1/router/update/<karl_update_secret>?myip={example_ipv4}'"
    status_example = f"curl -sS '{base_url}/api/v1/hostnames/<karl_dashboard_secret>?history_limit=10'"
    rotate_example = f"curl -sS -X POST {base_url}/api/v1/hostnames/<karl_dashboard_secret>/rotate-update-url"
    schema_example = f"curl -sS {base_url}/openapi.json"
    description = "Small KarlDNS API guide for creating, activating, updating, reading, and deleting generated Dynamic DNS hostnames."
    return _page(
        "KarlDNS API",
        trusted(f"""
        <main id="main">
          {_top_nav()}
          <section class="hero-band compact">
            <div class="container text-center d-grid justify-items-center gap-3">
              <p class="eyebrow">API</p>
              <h1>Small API surface.</h1>
              <p class="lead">Create a hostname, register it, update it, and read its status.</p>
            </div>
          </section>
          <section class="section section-compact">
            <div class="container narrow d-grid gap-4">
              <div class="api-endpoints">
                <h2>Endpoints</h2>
                <ol class="simple-steps text-start">
                  <li><strong>POST /api/v1/hostnames.</strong> Create a pending hostname and private setup values. The response includes <code>registration_url</code>.</li>
                  <li><strong>GET or POST /api/v1/router/register/&lt;karl_secret&gt;.</strong> Register the hostname after secrets are saved. Uses the request IP, or <code>myip</code>/<code>myipv6</code>, for the initial DNS record.</li>
                  <li><strong>GET or POST /api/v1/router/update/&lt;karl_secret&gt;.</strong> Router-friendly update endpoint. Supports <code>myip</code>, <code>ipaddr</code>, <code>myipv6</code>, and <code>ip6addr</code>.</li>
                  <li><strong>GET /api/v1/hostnames/&lt;karl_secret&gt;.</strong> Read hostname status and recent history.</li>
                  <li><strong>POST /api/v1/hostnames/&lt;karl_secret&gt;/rotate-update-url.</strong> Replace the private router update URL.</li>
                  <li><strong>DELETE /api/v1/hostnames/&lt;karl_secret&gt;.</strong> Delete hostname and DNS records.</li>
                </ol>
              </div>
              <div>
                <h2>Create</h2>
                {_code_window(create_example, copy_label="create command", class_name="mt-3")}
              </div>
              <div>
                <h2>Register</h2>
                {_code_window(register_example, copy_label="register command", class_name="mt-3")}
              </div>
              <div>
                <h2>Update</h2>
                {_code_window(update_example, copy_label="update command", class_name="mt-3")}
              </div>
              <div>
                <h2>Status</h2>
                <p class="section-copy">Use the private dashboard secret to read current DNS state and recent updates for only that hostname.</p>
                {_code_window(status_example, copy_label="status command", class_name="mt-3")}
              </div>
              <div>
                <h2>Rotate update URL</h2>
                <p class="section-copy">Use the private dashboard secret to replace the router update URL. The old update URL stops working immediately.</p>
                {_code_window(rotate_example, copy_label="rotate command", class_name="mt-3")}
              </div>
              <div>
                <h2>Schema</h2>
                <p class="section-copy">Machine-readable OpenAPI is available for the public hostname and router endpoints.</p>
                {_code_window(schema_example, copy_label="schema command", class_name="mt-3")}
              </div>
            </div>
          </section>
        </main>
        """),
        description=description,
        canonical_url=f"{base_url}/docs",
        image_url=f"{base_url}/social-preview.png",
        image_alt="KarlDNS API documentation",
    )