import yaml
from flask import Flask, jsonify, request, Response, abort

import build  # reuse your existing static builder logic

app = Flask(__name__)


def list_pages():
    """
    Return a lightweight list of pages for a sidebar etc.
    Uses build.load_pages() from the existing builder.
    """
    pages = build.load_pages()
    result = []
    for p in pages:
        result.append({
            "slug": p.get("slug", ""),
            "title": p.get("title", ""),
            "language": p.get("language", "de"),
        })
    result.sort(key=lambda x: x["slug"])
    return result


@app.get("/api/pages")
def api_list_pages():
    return jsonify(list_pages())


@app.get("/api/pages/<slug>")
def api_get_page(slug):
    try:
        page, path = build.load_page_by_slug(slug)
    except FileNotFoundError:
        abort(404, description="Page not found")
    return jsonify(page)


@app.put("/api/pages/<slug>")
def api_save_page(slug):
    """
    Save page JSON back as YAML. For now we trust the structure,
    since the admin UI is under our control.
    """
    try:
        _, path = build.load_page_by_slug(slug)
    except FileNotFoundError:
        abort(404, description="Page not found")

    new_page = request.get_json(force=True, silent=False)
    if not isinstance(new_page, dict):
        abort(400, description="Expected JSON object")

    # Ensure slug consistency
    new_page.setdefault("slug", slug)

    with open(path, "w", encoding="utf-8") as f:
        yaml.safe_dump(
            new_page,
            f,
            allow_unicode=True,
            sort_keys=False,
            width=1000,
        )

    return ("", 204)


@app.get("/preview/<slug>/")
def preview_page(slug):
    """
    Render HTML for a single page using existing Jinja templates.
    No disk write: we render directly from the current YAML content.
    """
    try:
        page, _ = build.load_page_by_slug(slug)
    except FileNotFoundError:
        abort(404, description="Page not found")

    html = build.render_page(page)
    return Response(html, mimetype="text/html")


if __name__ == "__main__":
    # For development; in production we'll run this with gunicorn and Caddy as reverse proxy.
    app.run(host="127.0.0.1", port=8075, debug=True)