"""Homepage showcase configuration and URL validation."""


from database_service import database_connection
import json
from runtime_config import (
    DATABASE_URL,
    logger,
)
import urllib.parse

__all__ = ["get_homepage_showcase_links", "save_homepage_showcase_links"]

HOMEPAGE_SHOWCASE_KEY = "homepage_showcase"


def _default_homepage_showcase_links():
    return [
        {"label": "Site 1", "url": ""},
        {"label": "Site 2", "url": ""},
        {"label": "Site 3", "url": ""},
    ]

def get_homepage_showcase_links():
    """Load 3 homepage showcase slots from site_settings."""
    default = _default_homepage_showcase_links()
    try:
        with database_connection() as conn:
            cursor = conn.cursor()
            cursor.execute("SELECT value FROM site_settings WHERE key = ?", (HOMEPAGE_SHOWCASE_KEY,))
            row = cursor.fetchone()
            if not row:
                return default
            raw = row['value'] if isinstance(row, dict) else row[0]
            data = json.loads(raw)
            if not isinstance(data, list):
                return default
            out = []
            for i in range(3):
                if i < len(data) and isinstance(data[i], dict):
                    label = (data[i].get('label') or f'Site {i + 1}').strip()[:160]
                    url = (data[i].get('url') or '').strip()[:2048]
                    out.append({"label": label, "url": url})
                else:
                    out.append({"label": f'Site {i + 1}', "url": ""})
            return out
    except Exception as e:
        logger.error(f"get_homepage_showcase_links: {e}")
        return default

def _normalize_showcase_url(url: str) -> str:
    u = (url or '').strip()
    if not u:
        return ''
    if not u.startswith(('http://', 'https://')):
        u = 'https://' + u
    return u

def _is_valid_http_url(u: str) -> bool:
    if not u:
        return True
    try:
        p = urllib.parse.urlparse(u)
        return p.scheme in ('http', 'https') and bool(p.netloc)
    except Exception:
        return False

def save_homepage_showcase_links(links: list) -> None:
    payload = json.dumps(links, ensure_ascii=False)
    with database_connection() as conn:
        cursor = conn.cursor()
        if 'postgres' in DATABASE_URL:
            cursor.execute(
                "INSERT INTO site_settings (key, value, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP) ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = CURRENT_TIMESTAMP",
                (HOMEPAGE_SHOWCASE_KEY, payload)
            )
        else:
            cursor.execute("SELECT 1 FROM site_settings WHERE key = ?", (HOMEPAGE_SHOWCASE_KEY,))
            if cursor.fetchone():
                cursor.execute(
                    "UPDATE site_settings SET value = ?, updated_at = CURRENT_TIMESTAMP WHERE key = ?",
                    (payload, HOMEPAGE_SHOWCASE_KEY),
                )
            else:
                cursor.execute(
                    "INSERT INTO site_settings (key, value) VALUES (?, ?)",
                    (HOMEPAGE_SHOWCASE_KEY, payload),
                )
        conn.commit()