mtg_python_deckbuilder/code/web/services/card_index.py

137 lines
4.6 KiB
Python

"""Card index construction & lookup (extracted from sampling / theme_preview).
Phase A refactor: Provides a thin API for building and querying the in-memory
card index keyed by tag/theme. Future enhancements may introduce a persistent
cache layer or precomputed artifact.
Public API:
maybe_build_index() -> None
get_tag_pool(tag: str) -> list[dict]
lookup_commander(name: str) -> dict | None
The index is rebuilt lazily when any of the CSV shard files change mtime.
"""
from __future__ import annotations
from pathlib import Path
import csv
import os
from typing import Any, Dict, List, Optional
CARD_FILES_GLOB = [
Path("csv_files/blue_cards.csv"),
Path("csv_files/white_cards.csv"),
Path("csv_files/black_cards.csv"),
Path("csv_files/red_cards.csv"),
Path("csv_files/green_cards.csv"),
Path("csv_files/colorless_cards.csv"),
Path("csv_files/cards.csv"), # fallback large file last
]
THEME_TAGS_COL = "themeTags"
NAME_COL = "name"
COLOR_IDENTITY_COL = "colorIdentity"
MANA_COST_COL = "manaCost"
RARITY_COL = "rarity"
_CARD_INDEX: Dict[str, List[Dict[str, Any]]] = {}
_CARD_INDEX_MTIME: float | None = None
_RARITY_NORM = {
"mythic rare": "mythic",
"mythic": "mythic",
"m": "mythic",
"rare": "rare",
"r": "rare",
"uncommon": "uncommon",
"u": "uncommon",
"common": "common",
"c": "common",
}
def _normalize_rarity(raw: str) -> str:
r = (raw or "").strip().lower()
return _RARITY_NORM.get(r, r)
def _resolve_card_files() -> List[Path]:
"""Return base card file list + any extra test files supplied via env.
Environment variable: CARD_INDEX_EXTRA_CSV can contain a comma or semicolon
separated list of additional CSV paths (used by tests to inject synthetic
edge cases without polluting production shards).
"""
files: List[Path] = list(CARD_FILES_GLOB)
extra = os.getenv("CARD_INDEX_EXTRA_CSV")
if extra:
for part in extra.replace(";", ",").split(","):
p = part.strip()
if not p:
continue
path_obj = Path(p)
# Include even if missing; maybe created later in test before build
files.append(path_obj)
return files
def maybe_build_index() -> None:
"""Rebuild the index if any card CSV mtime changed.
Incorporates any extra CSVs specified via CARD_INDEX_EXTRA_CSV.
"""
global _CARD_INDEX, _CARD_INDEX_MTIME
latest = 0.0
card_files = _resolve_card_files()
for p in card_files:
if p.exists():
mt = p.stat().st_mtime
if mt > latest:
latest = mt
if _CARD_INDEX and _CARD_INDEX_MTIME and latest <= _CARD_INDEX_MTIME:
return
new_index: Dict[str, List[Dict[str, Any]]] = {}
for p in card_files:
if not p.exists():
continue
try:
with p.open("r", encoding="utf-8", newline="") as fh:
reader = csv.DictReader(fh)
if not reader.fieldnames or THEME_TAGS_COL not in reader.fieldnames:
continue
for row in reader:
name = row.get(NAME_COL) or row.get("faceName") or ""
tags_raw = row.get(THEME_TAGS_COL) or ""
tags = [t.strip(" '[]") for t in tags_raw.split(',') if t.strip()] if tags_raw else []
if not tags:
continue
color_id = (row.get(COLOR_IDENTITY_COL) or "").strip()
mana_cost = (row.get(MANA_COST_COL) or "").strip()
rarity = _normalize_rarity(row.get(RARITY_COL) or "")
for tg in tags:
if not tg:
continue
new_index.setdefault(tg, []).append({
"name": name,
"color_identity": color_id,
"tags": tags,
"mana_cost": mana_cost,
"rarity": rarity,
"color_identity_list": list(color_id) if color_id else [],
"pip_colors": [c for c in mana_cost if c in {"W","U","B","R","G"}],
})
except Exception:
continue
_CARD_INDEX = new_index
_CARD_INDEX_MTIME = latest
def get_tag_pool(tag: str) -> List[Dict[str, Any]]:
return _CARD_INDEX.get(tag, [])
def lookup_commander(name: Optional[str]) -> Optional[Dict[str, Any]]:
if not name:
return None
needle = name.lower().strip()
for tag_cards in _CARD_INDEX.values():
for c in tag_cards:
if c.get("name", "").lower() == needle:
return c
return None