#!/usr/bin/env python3
"""Fill in developer, publisher, year and description from Wikipedia.

The library's own data is thin in exactly these columns — the 2018 dump carried
titles, systems and genres, but almost no developer or publisher and no
descriptions at all. This reads the values off the same English Wikipedia
articles the cover fetcher already locates.

Developer, publisher and release year are facts and are written verbatim.
Descriptions come from the article summary, which is CC BY-SA text, so each one
is stored with an attribution line naming the source article.

Only empty fields are filled unless --overwrite is given: anything typed by hand
outranks anything guessed here.

    python3 enrich_metadata.py --password '...' --dry-run
    python3 enrich_metadata.py --password '...'
"""

from __future__ import annotations

import argparse
import difflib
import json
import re
import sys
import urllib.parse
from pathlib import Path

# The cover fetcher already owns the throttled, cached Wikipedia client.
from fetch_art import (
    WIKI_UA, api_json, http, is_game_article, normalise, wiki_api, wiki_article,
)

FIELDS = ("developer", "publisher", "year", "description")

# Infobox values for multi-platform games are frequently grouped under a bold
# platform heading ("'''PlayStation'''{{vgrelease|JP|Square|...}}") or annotated
# with the platform in parentheses ("Rare (N64)<br>Nintendo (DS)"). Both would
# otherwise be read as the developer or publisher itself.
PLATFORM_WORDS = (
    "nes", "snes", "super nes", "super nintendo", "nintendo entertainment system",
    "n64", "nintendo 64", "gamecube", "gc", "wii", "wii u", "switch",
    "nintendo switch", "game boy", "game boy color", "game boy advance", "gb",
    "gbc", "gba", "nintendo ds", "ds", "3ds", "nintendo 3ds",
    "playstation", "ps1", "ps2", "ps3", "ps4", "ps5", "playstation 2",
    "playstation 3", "playstation 4", "playstation 5", "psp",
    "playstation portable", "playstation vita", "vita",
    "xbox", "xbox 360", "xbox one", "xbox series x", "x360",
    "windows", "win", "pc", "ms-dos", "dos", "mac", "macos", "osx", "linux",
    "ios", "android", "arcade", "arc", "genesis", "mega drive", "md",
    "dreamcast", "saturn", "amiga", "psx", "xbla", "wiiu", "ngc", "3do",
    "steam", "microsoft windows",
)

# Whether an article covers the platform a row claims. Used to keep a port's
# entry from inheriting the original release's year.
PLATFORM_PATTERNS = {
    "NES": r"Nintendo Entertainment System|\bNES\b",
    "SNES": r"Super Nintendo|Super NES|\bSNES\b",
    "N64": r"Nintendo 64",
    "GB": r"Game Boy(?! Advance)",   # plain Game Boy or Game Boy Color
    "GBA": r"Game Boy Advance",
    "DS": r"Nintendo DS",
    "GC": r"GameCube",
    "WII": r"\bWii\b(?! ?U)",
    "PS1": r"PlayStation(?!\s*(?:2|3|4|5|Portable|Vita))",
    "PS2": r"PlayStation 2",
    "PSP": r"PlayStation Portable|\bPSP\b",
    "360": r"Xbox 360",
}


# Release templates tag each entry with a region, so those codes sit between the
# heading and the value we actually want.
REGION_CODES = {
    "jp", "na", "eu", "au", "ww", "uk", "us", "ca", "kr", "cn", "br", "ru", "in",
    "sea", "int", "pal", "ntsc", "row", "as", "hk", "tw", "mx", "nz", "fr", "de",
    "es", "it", "nl", "se", "no", "dk", "fi", "pt", "pl",
}

DATE_LIKE = re.compile(
    r"^\s*(?:\d{1,2}\s+)?(?:January|February|March|April|May|June|July|August|"
    r"September|October|November|December)\b|^\s*\d{1,2}[/-]\d{1,2}[/-]\d{2,4}\s*$"
    r"|^\s*(?:19|20)\d{2}\s*$",
    re.I,
)


def is_platform_label(text: str) -> bool:
    return text.strip().lower().strip(":;,") in PLATFORM_WORDS


def is_noise_entry(text: str) -> bool:
    """Region tags, dates and platform headings are scaffolding, not values."""
    stripped = text.strip().lower().strip(":;,")
    return (
        not stripped
        or stripped in REGION_CODES
        or is_platform_label(stripped)
        or bool(DATE_LIKE.match(text))
    )


def article_covers_system(wikitext: str, system: str | None) -> bool:
    """True when the article's platform list mentions the row's system."""
    if not system:
        return False
    pattern = PLATFORM_PATTERNS.get(system.upper())
    if not pattern:
        return False

    platforms = infobox_field(wikitext, "platforms") or infobox_field(wikitext, "platform") or ""
    return re.search(pattern, platforms, flags=re.I) is not None


# --------------------------------------------------------------------------
# Article resolution
# --------------------------------------------------------------------------

def resolve_article(game: dict, cache_dir: Path) -> tuple[str, str] | None:
    """Find the article about this specific game.

    Direct title guesses first, then a search. The search matters for titles
    whose bare name is the series overview rather than a game — "Mortal Kombat"
    and "SimCity" both are, with the games at "(1992 video game)" and
    "(1989 video game)" — and for small punctuation differences, such as our
    "Dragon Ball Z Budokai" against the catalogued "Dragon Ball Z: Budokai".
    """
    title, year, system = game["title"], game.get("year"), game.get("system")

    attempts = [title, f"{title} (video game)"]
    if year:
        attempts.append(f"{title} ({year} video game)")

    for candidate in attempts:
        found = wiki_article(candidate, cache_dir)
        if found and is_game_article(found[1]):
            return found

    try:
        results = wiki_api(list="search", srsearch=f"{title} video game", srlimit=5)
        titles = [r["title"] for r in results.get("query", {}).get("search", [])]
    except Exception:  # noqa: BLE001
        return None

    target = normalise(title)
    scored: list[tuple[bool, float, tuple[str, str]]] = []

    for candidate in titles:
        found = wiki_article(candidate, cache_dir)
        if not found or not is_game_article(found[1]):
            continue

        # Strip the disambiguator before comparing: "Mortal Kombat (1992 video
        # game)" should read as "Mortal Kombat".
        bare = re.sub(r"\s*\([^)]*\)\s*$", "", found[0])
        similarity = difflib.SequenceMatcher(None, target, normalise(bare)).ratio()
        scored.append((article_covers_system(found[1], system), similarity, found))

    if not scored:
        return None

    scored.sort(key=lambda s: (s[0], s[1]), reverse=True)
    covers, similarity, article = scored[0]

    # A search hit that neither covers the platform nor closely matches the name
    # is more likely a sibling in the series than this game — our "Dragon Ball Z
    # Budokai" surfaces "Dragon Ball Z: Shin Budokai", a different game on a
    # different console. A blank field beats a confidently wrong one.
    if not covers and similarity < 0.90:
        return None

    return article


# --------------------------------------------------------------------------
# Wikitext cleaning
# --------------------------------------------------------------------------

def clean_value(value: str) -> str:
    """Reduce an infobox field to plain text.

    Infobox values are wikitext, so a developer might arrive as
    ``[[Rare (company)|Rare]]`` or as a ``{{ubl|...}}`` list with references
    attached. This unwraps the common forms and keeps the first entry.
    """
    text = value

    # Footnotes and comments carry nothing we want.
    text = re.sub(r"<ref[^>]*/>", "", text)
    text = re.sub(r"<ref.*?</ref>", "", text, flags=re.S | re.I)
    text = re.sub(r"<!--.*?-->", "", text, flags=re.S)

    # List and release templates carry the value we want as their arguments —
    # {{vgrelease|JP|Square|NA|Square Electronic Arts}} holds the publisher —
    # so keep the payload and drop only the wrapper.
    text = re.sub(
        r"\{\{\s*(?:ubl|unbulleted list|plainlist|flatlist|hlist|"
        r"vgrelease|vgr|video game release|collapsible list|nobold|nowrap)\s*\|",
        "|", text, flags=re.I)
    # Anything still wrapped in braces is scaffolding for these fields.
    text = re.sub(r"\{\{[^{}]*\}\}", "|", text)
    text = text.replace("{{", "|").replace("}}", "|")

    # [[Target|Label]] -> Label, [[Target]] -> Target
    text = re.sub(r"\[\[([^\]|]+)\|([^\]]+)\]\]", r"\2", text)
    text = re.sub(r"\[\[([^\]]+)\]\]", r"\1", text)

    text = re.sub(r"<br\s*/?>", "|", text, flags=re.I)
    text = re.sub(r"<[^>]+>", "", text)
    text = text.replace("'''", "").replace("''", "")

    # Take the first real entry of whatever list survived, skipping any leading
    # platform heading that was grouping the list.
    parts = [p.strip(" *\n\t") for p in re.split(r"[|\n]", text)]
    parts = [re.sub(r"\s+", " ", p).strip(" ,;") for p in parts if p.strip(" *\n\t")]

    # A named template parameter leaks through unwrapping as "title=Foo";
    # keep the value, drop the key.
    parts = [re.sub(r"^[a-z_][a-z0-9_]*\s*=\s*", "", p, flags=re.I) for p in parts]
    parts = [p for p in parts if p]

    first = next((p for p in parts if not is_noise_entry(p)), "")

    # Drop a trailing platform annotation: "Rare (N64)" -> "Rare".
    match = re.match(r"^(.*?)\s*\(([^()]*)\)$", first)
    if match and is_platform_label(match.group(2)):
        first = match.group(1).strip()

    return first.strip(" ,;")


def infobox_field(wikitext: str, field: str) -> str | None:
    """Raw value of one infobox field, brace- and bracket-aware."""
    match = re.search(rf"^\s*\|\s*{field}\s*=", wikitext, flags=re.M | re.I)
    if not match:
        return None

    index = match.end()
    depth_brace = depth_bracket = 0
    out: list[str] = []

    while index < len(wikitext):
        two = wikitext[index:index + 2]
        if two == "{{":
            depth_brace += 1
        elif two == "}}":
            depth_brace -= 1
        elif two == "[[":
            depth_bracket += 1
        elif two == "]]":
            depth_bracket -= 1

        char = wikitext[index]
        # A pipe or newline-pipe at depth zero ends this field.
        if depth_brace <= 0 and depth_bracket <= 0 and char == "|":
            break
        if depth_brace <= 0 and depth_bracket <= 0 and char == "\n" and \
                re.match(r"\s*[|}]", wikitext[index:index + 3]):
            break

        out.append(char)
        index += 1

    return "".join(out).strip() or None


def extract_year(value: str) -> str | None:
    """First plausible release year in a {{Video game release}} block."""
    years = re.findall(r"\b(19[5-9]\d|20[0-4]\d)\b", value)
    return years[0] if years else None


# --------------------------------------------------------------------------
# Summary
# --------------------------------------------------------------------------

def wiki_summary(page_title: str) -> str | None:
    """Short article summary via the REST endpoint, which is built for reuse."""
    quoted = urllib.parse.quote(page_title.replace(" ", "_"), safe="")
    raw = http(f"https://en.wikipedia.org/api/rest_v1/page/summary/{quoted}",
               headers={"User-Agent": WIKI_UA})
    extract = (json.loads(raw) or {}).get("extract")
    if not extract:
        return None

    text = re.sub(r"\s+", " ", extract).strip()
    # CC BY-SA requires attribution, so it travels with the text.
    return f"{text}\n\nSource: Wikipedia — {page_title}"


# --------------------------------------------------------------------------
# Main
# --------------------------------------------------------------------------

def main() -> int:
    parser = argparse.ArgumentParser(
        description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument("--api", default="http://localhost:8080")
    parser.add_argument("--user", default="ckoch")
    parser.add_argument("--password", required=True)
    parser.add_argument("--dry-run", action="store_true")
    parser.add_argument("--overwrite", action="store_true",
                        help="replace fields that already have a value")
    parser.add_argument("--fields", default=",".join(FIELDS),
                        help=f"comma-separated subset of: {','.join(FIELDS)}")
    parser.add_argument("--cache", default=str(Path(__file__).parent / ".cache"))
    args = parser.parse_args()

    wanted = [f.strip() for f in args.fields.split(",") if f.strip() in FIELDS]
    if not wanted:
        print("No valid fields requested.", file=sys.stderr)
        return 2

    base = args.api.rstrip("/")
    cache_dir = Path(args.cache)

    print("Signing in…")
    auth = api_json(base, "/api/auth/login",
                    data={"userName": args.user, "password": args.password})
    token = auth["token"]

    print("Fetching library…")
    games: list[dict] = []
    page = 1
    while True:
        result = api_json(base, f"/api/games?page={page}&pageSize=100", token)
        games.extend(result["items"])
        if page >= result["totalPages"] or not result["items"]:
            break
        page += 1
    print(f"  {len(games)} games\n")

    filled = {field: 0 for field in wanted}
    touched = failed = 0
    no_article: list[dict] = []
    skipped_year: list[dict] = []

    for game in sorted(games, key=lambda g: g["title"].lower()):
        missing = [f for f in wanted if args.overwrite or not game.get(f)]
        if not missing:
            continue

        try:
            article = resolve_article(game, cache_dir)
        except Exception as exc:  # noqa: BLE001
            print(f"  !  {game['title'][:44]:46} lookup failed: {exc}")
            article = None

        if not article:
            no_article.append(game)
            continue

        page_title, wikitext = article
        updates: dict[str, str] = {}

        for field in missing:
            if field == "description":
                try:
                    summary = wiki_summary(page_title)
                except Exception:  # noqa: BLE001
                    summary = None
                if summary:
                    updates["description"] = summary
                continue

            if field == "year":
                # An article covers every platform a game shipped on, and its
                # release block leads with the original. Taking that year for a
                # later port would date a DS re-release to the SNES original, so
                # only fill it when the article actually covers this platform.
                if not article_covers_system(wikitext, game.get("system")):
                    skipped_year.append(game)
                    continue
                raw = infobox_field(wikitext, "released")
                value = extract_year(raw) if raw else None
            else:
                raw = infobox_field(wikitext, field)
                value = clean_value(raw) if raw else None

            if value:
                updates[field] = value

        if not updates:
            continue

        summary_line = ", ".join(
            f"{k}={v[:26]}…" if len(v) > 26 else f"{k}={v}"
            for k, v in updates.items() if k != "description")
        if "description" in updates:
            summary_line = (summary_line + ", " if summary_line else "") + "description"

        print(f"  +  {game['system'] or '-':4} {game['title'][:40]:42} {summary_line[:60]}")

        for field in updates:
            filled[field] += 1
        touched += 1

        if args.dry_run:
            continue

        payload = {k: game.get(k) for k in (
            "title", "system", "genre", "year", "developer", "publisher",
            "art", "description", "own", "dumped", "played", "finished")}
        payload.update(updates)

        try:
            api_json(base, f"/api/games/{game['id']}", token, data=payload, method="PUT")
        except Exception as exc:  # noqa: BLE001
            print(f"     -> FAILED: {exc}")
            failed += 1
            touched -= 1

    print("\n" + "=" * 72)
    verb = "would update" if args.dry_run else "updated"
    print(f"{verb}: {touched} games   failed: {failed}")
    for field in wanted:
        print(f"    {field:12} {filled[field]:3}")

    if skipped_year:
        print(f"\nYear left alone — the article does not cover this platform, so its "
              f"release date belongs to a different version ({len(skipped_year)}):")
        for game in skipped_year[:15]:
            print(f"       {game['system'] or '-':4} {game['title']}")

    if no_article:
        print(f"\nNo Wikipedia article found ({len(no_article)}):")
        for game in no_article[:20]:
            print(f"       {game['system'] or '-':4} {game['title']}")

    return 0


if __name__ == "__main__":
    sys.exit(main())