"""
Parser d'une page individuelle de band Metal Archives.
Adapté de C:\Users\nicol\Documents\crawlerbm\src\scrape_band_page.py
"""
import hashlib
import re
from typing import Any, Dict, List, Optional

from bs4 import BeautifulSoup


def parse_band_page(html: str) -> Dict[str, Any]:
    soup = BeautifulSoup(html, "lxml")
    out: Dict[str, Any] = {}

    title = soup.find("title")
    out["title"] = _text(title)

    h1 = (
        soup.find("h1", class_=re.compile(r"band_name", re.I))
        or soup.find("h1")
    )
    out["name"] = _text(h1)

    # Bloc #band_stats : dt/dd pairs
    stats = soup.find("div", id="band_stats") or soup.find("div", id="band_info") or soup
    kv: Dict[str, str] = {}
    for dl in stats.find_all("dl"):
        for dt in dl.find_all("dt"):
            dd = dt.find_next_sibling("dd")
            k = _text(dt).rstrip(":")
            v = _text(dd)
            if k and v:
                kv[k] = v

    out["info"] = kv
    out["status"]       = _pick(kv, "Status")
    out["formed_in"]    = _pick(kv, "Formed in", "Formed")
    out["genre"]        = _pick(kv, "Genre")
    out["themes"]       = _pick(kv, "Lyrical themes", "Lyrical Themes")
    out["label"]        = _pick(kv, "Current label", "Label")
    out["years_active"] = _pick(kv, "Years active")

    # Dates "Added on" / "Last modified" (souvent dans #auditTrail ou en bas de page)
    audit = soup.find(id="auditTrail") or soup.find("div", class_=re.compile(r"audit", re.I))
    if audit:
        trail_text = _text(audit)
        m_added = re.search(r"Added on:\s*([^\n,]+)", trail_text, re.I)
        m_modified = re.search(r"Last modified on:\s*([^\n,]+)", trail_text, re.I)
        out["ma_created_at"] = m_added.group(1).strip() if m_added else None
        out["ma_modified_at"] = m_modified.group(1).strip() if m_modified else None

    # Membres
    members: List[Dict] = []
    for table in soup.find_all("table"):
        cls = " ".join(table.get("class") or [])
        if "lineupTable" not in cls:
            continue
        section_el = table.find_previous(["h2", "h3"])
        section = _text(section_el) if section_el else None
        headers = [_text(th) for th in table.find_all("th")]
        for tr in table.find_all("tr")[1:]:
            tds = tr.find_all(["td", "th"])
            if not tds:
                continue
            cells = [_text(td) for td in tds]
            row = dict(zip(headers, cells)) if headers and len(headers) == len(cells) else {"cells": cells}
            if section:
                row["section"] = section
            members.append(row)
    if members:
        out["members"] = members

    # Liens externes
    links_div = soup.find("div", id="band_links")
    if links_div:
        out["links"] = [
            {"text": _text(a), "url": a["href"]}
            for a in links_div.find_all("a", href=True)
        ]

    return out


def page_hash(html: str) -> str:
    """MD5 du HTML pour détecter les changements."""
    return hashlib.md5(html.encode()).hexdigest()


def _text(el) -> str:
    return (el.get_text(" ", strip=True) if el else "").strip()


def _pick(kv: Dict, *keys: str) -> Optional[str]:
    for k in keys:
        if k in kv:
            return kv[k]
    return None