"""Page route registration for the legacy Jinja UI."""

import json
import logging

from flask import current_app, redirect, render_template, url_for
from flask_login import current_user, login_required

from services import get_display_name_for_source, load_platform_config, post_service

logger = logging.getLogger(__name__)


def _load_user_settings():
    if not current_user.is_authenticated:
        return {}
    try:
        return json.loads(current_user.settings) if current_user.settings else {}
    except (json.JSONDecodeError, TypeError):
        return {}


def register_page_routes(app):
    """Register legacy page routes while preserving endpoint names."""

    @app.route("/")
    def index():
        """Serve the main feed page."""
        quick_stats = post_service.quick_stats()

        if current_user.is_authenticated:
            return render_template(
                "dashboard.html",
                user_settings=_load_user_settings(),
                quick_stats=quick_stats,
            )

        if current_app.config.get("ALLOW_ANONYMOUS_ACCESS", False):
            user_settings = {
                "filter_set": "no_filter",
                "communities": [],
                "experience": {
                    "infinite_scroll": False,
                    "auto_refresh": False,
                    "push_notifications": False,
                    "dark_patterns_opt_in": False,
                    "time_filter_enabled": False,
                    "time_filter_days": 7,
                },
            }
            return render_template(
                "dashboard.html",
                user_settings=user_settings,
                anonymous=True,
                quick_stats=quick_stats,
            )

        return redirect(url_for("login"))

    @app.route("/bookmarks")
    @login_required
    def bookmarks():
        """Bookmarks page."""
        return render_template("bookmarks.html", user=current_user)

    @app.route("/post/<post_id>")
    def post_detail(post_id):
        """Serve individual post detail page with modern theme."""
        try:
            platform_config = load_platform_config()
            cached_posts, cached_comments = post_service.load()

            post_data = cached_posts.get(post_id)
            if not post_data:
                return render_template("404.html"), 404

            post = dict(post_data)
            post["source_display"] = get_display_name_for_source(
                post.get("platform", ""),
                post.get("source", ""),
                platform_config,
            )

            comments_flat = cached_comments.get(post_id, [])
            logger.info(f"Loading post {post_id}: found {len(comments_flat)} comments")
            comments = post_service.build_comment_tree(comments_flat)

            return render_template(
                "post_detail.html",
                post=post,
                comments=comments,
                user_settings=_load_user_settings(),
            )
        except Exception as e:
            logger.error(f"Error loading post {post_id}: {e}")
            return render_template("404.html"), 404