optcg-api/main.py at main · arjunkai/optcg-api · GitHub

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"""
OPTCG API — FastAPI backend
Validated against:
  - Render deployment docs (host 0.0.0.0, $PORT)
  - Pokemon TCG API response conventions
  - FastAPI + psycopg2 best practices

Endpoints:
  GET /                   — API info
  GET /sets               — all sets
  GET /sets/{id}/cards    — cards in a set
  GET /cards              — all cards with filters + pagination
  GET /cards/{id}         — single card + all sets it appears in
Docs: /docs  (Swagger UI auto-generated by FastAPI)
"""

import os
from typing import Optional
from contextlib import contextmanager
from fastapi import FastAPI, HTTPException, Query
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import HTMLResponse
import psycopg2
import psycopg2.extras
from dotenv import load_dotenv

load_dotenv()

tags_metadata = [
    {
        "name": "Info",
        "description": "API status and metadata.",
    },
    {
        "name": "Sets",
        "description": "Browse booster packs and starter decks. Each set has a unique ID like `OP-01` or `ST-01`.",
    },
    {
        "name": "Cards",
        "description": "Search, filter, and retrieve individual cards. Supports pagination and all major filter combinations.",
    },
    {
        "name": "Images",
        "description": "Proxy card artwork from the official One Piece Card Game site. Returns PNG with CORS headers.",
    },
]

app = FastAPI(
    title="OPTCG API",
    description=(
        "**Free REST API for One Piece TCG card data.**\n\n"
        "Cards, sets, filters, and image proxying — built for "
        "[OPBindr](https://opbindr.com) and the OPTCG community.\n\n"
        "- Pagination follows the [Pokemon TCG API](https://pokemontcg.io/) convention (`page` / `pageSize`)\n"
        "- All card IDs are uppercase (e.g. `OP01-001`, `ST01-001`)\n"
        "- Image proxy adds CORS headers so you can use card art directly in the browser"
    ),
    version="1.0.0",
    openapi_tags=tags_metadata,
    docs_url=None,  # we serve custom /docs below
)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["GET", "HEAD"],
    allow_headers=["*"],
)


@app.get("/docs", include_in_schema=False)
async def scalar_docs():
    return HTMLResponse("""
<!DOCTYPE html>
<html>
<head>
    <title>OPTCG API — Docs</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body>
    <script id="api-reference" data-url="/openapi.json"></script>
    <script src="https://cdn.jsdelivr.net/npm/@scalar/api-reference"></script>
</body>
</html>
    """)

# ── Database ──────────────────────────────────────────────────────────────────
# Connection-per-request is correct for Render free tier + Supabase session
# pooler. Render sleeps between requests so a persistent pool would be dropped
# anyway. Supabase's session pooler handles actual connection pooling server-side.

@contextmanager
def get_db():
    """Open a connection, yield cursor, always close on exit."""
    conn = psycopg2.connect(
        os.environ["DATABASE_URL"],
        cursor_factory=psycopg2.extras.RealDictCursor,
    )
    try:
        cur = conn.cursor()
        yield cur
    finally:
        conn.close()


def fetch(sql: str, params=None) -> list:
    with get_db() as cur:
        cur.execute(sql, params or [])
        return cur.fetchall()


def fetch_one(sql: str, params=None):
    with get_db() as cur:
        cur.execute(sql, params or [])
        return cur.fetchone()


# ── Routes ────────────────────────────────────────────────────────────────────

@app.get(
    "/",
    tags=["Info"],
    summary="API Info",
    description="Returns API name, version, docs URL, and a list of available endpoints.",
    responses={
        200: {
            "description": "API metadata",
            "content": {
                "application/json": {
                    "example": {
                        "name": "OPTCG API",
                        "version": "1.0.0",
                        "docs": "/docs",
                        "endpoints": [
                            "GET /sets",
                            "GET /sets/{id}/cards",
                            "GET /cards",
                            "GET /cards/{id}",
                            "GET /images/{card_id}",
                        ],
                    }
                }
            },
        }
    },
)
def root():
    return {
        "name":    "OPTCG API",
        "version": "1.0.0",
        "docs":    "/docs",
        "endpoints": [
            "GET /sets",
            "GET /sets/{id}/cards",
            "GET /cards",
            "GET /cards/{id}",
            "GET /images/{card_id}",
        ],
    }


@app.api_route(
    "/sets",
    methods=["GET", "HEAD"],
    tags=["Sets"],
    summary="List All Sets",
    description="Returns every set (booster packs, starter decks, promo packs) ordered newest first.",
    responses={
        200: {
            "description": "All sets",
            "content": {
                "application/json": {
                    "example": {
                        "count": 2,
                        "data": [
                            {"id": "OP01", "pack_id": "550101", "label": "Romance Dawn [OP-01]", "card_count": 121},
                            {"id": "ST01", "pack_id": "550001", "label": "Straw Hat Crew [ST-01]", "card_count": 17},
                        ],
                    }
                }
            },
        }
    },
)
def get_sets():
    rows = fetch("SELECT * FROM sets ORDER BY pack_id DESC")
    return {"count": len(rows), "data": rows}


@app.get(
    "/sets/{set_id}/cards",
    tags=["Sets"],
    summary="Get Cards in a Set",
    description=(
        "Returns all cards belonging to a specific set, ordered by card ID.\n\n"
        "**Example:** `/sets/OP01/cards` returns all cards from the *Romance Dawn* booster."
    ),
)
def get_set_cards(set_id: str):
    s = fetch_one("SELECT * FROM sets WHERE id = %s", [set_id.upper()])
    if not s:
        raise HTTPException(404, f"Set '{set_id}' not found")

    cards = fetch("""
        SELECT c.*
        FROM cards c
        JOIN card_sets cs ON cs.card_id = c.id
        WHERE cs.set_id = %s
        ORDER BY c.id
    """, [set_id.upper()])

    return {"set": s, "count": len(cards), "data": cards}


@app.get(
    "/cards/{card_id}",
    tags=["Cards"],
    summary="Get a Single Card",
    description=(
        "Returns full card data plus every set the card appears in.\n\n"
        "**Example:** `/cards/OP01-001` returns Roronoa Zoro with its set memberships."
    ),
    responses={
        200: {
            "description": "Full card object with sets",
            "content": {
                "application/json": {
                    "example": {
                        "id": "OP01-001",
                        "base_id": "OP01-001",
                        "name": "Roronoa Zoro",
                        "category": "Character",
                        "colors": ["Green"],
                        "rarity": "Common",
                        "cost": 3,
                        "power": 5000,
                        "counter": 0,
                        "attributes": ["Slash"],
                        "types": ["Supernovas", "Straw Hat Crew"],
                        "effect": None,
                        "trigger": None,
                        "image_url": "https://en.onepiece-cardgame.com/images/cardlist/card/OP01-001.png",
                        "parallel": False,
                        "sets": [
                            {"id": "OP01", "pack_id": "550101", "label": "Romance Dawn [OP-01]", "card_count": 121}
                        ],
                    }
                }
            },
        },
        404: {
            "description": "Card not found",
            "content": {
                "application/json": {
                    "example": {"detail": "Card 'XX99-999' not found"}
                }
            },
        },
    },
)
def get_card(card_id: str):
    card = fetch_one("SELECT * FROM cards WHERE id = %s", [card_id.upper()])
    if not card:
        raise HTTPException(404, f"Card '{card_id}' not found")

    sets = fetch("""
        SELECT s.*
        FROM sets s
        JOIN card_sets cs ON cs.set_id = s.id
        WHERE cs.card_id = %s
        ORDER BY s.pack_id
    """, [card_id.upper()])

    return {**card, "sets": sets}


@app.api_route(
    "/cards",
    methods=["GET", "HEAD"],
    tags=["Cards"],
    summary="Search Cards",
    description=(
        "Search and filter the full card database with pagination.\n\n"
        "**Filters** — all optional and combinable:\n"
        "- `set_id` — restrict to a single set (e.g. `OP01`)\n"
        "- `color` — card color (`Red`, `Blue`, `Green`, `Purple`, `Black`, `Yellow`)\n"
        "- `category` — card type (`Leader`, `Character`, `Event`, `Stage`, `Don`)\n"
        "- `rarity` — `Leader`, `Common`, `Uncommon`, `Rare`, `SuperRare`, `SecretRare`\n"
        "- `name` — partial text search (case insensitive)\n"
        "- `parallel` — `true` for alt-art only, `false` for base only\n"
        "- `variant_type` — parallel style: `alt_art`, `reprint`, `manga`, `serial`\n"
        "- `min_power` / `max_power` — power range\n"
        "- `min_cost` / `max_cost` — cost range\n\n"
        "**Pagination** follows the Pokemon TCG API convention: `page` (default 1) and `page_size` (default 50, max 500)."
    ),
)
def get_cards(
    # --- filters ---
    set_id:    Optional[str]  = Query(None, description="Filter by set e.g. OP-01"),
    color:     Optional[str]  = Query(None, description="Red, Blue, Green, Purple, Black, Yellow"),
    category:  Optional[str]  = Query(None, description="Leader, Character, Event, Stage, Don"),
    rarity:    Optional[str]  = Query(None, description="Leader, Common, Uncommon, Rare, SuperRare, SecretRare"),
    name:      Optional[str]  = Query(None, description="Partial name search"),
    parallel:  Optional[bool] = Query(None, description="true=parallel only, false=base only"),
    variant_type: Optional[str] = Query(None, description="alt_art, reprint, manga, serial"),
    min_power: Optional[int]  = Query(None, description="Min power"),
    max_power: Optional[int]  = Query(None, description="Max power"),
    min_cost:  Optional[int]  = Query(None, description="Min cost"),
    max_cost:  Optional[int]  = Query(None, description="Max cost"),
    # --- pagination (matches Pokemon TCG API convention) ---
    page:      int = Query(1,  ge=1,          description="Page number"),
    page_size: int = Query(50, ge=1, le=500,  description="Results per page (max 500)"),
):
    conditions, params = [], []

    if set_id:
        conditions.append(
            "EXISTS (SELECT 1 FROM card_sets cs WHERE cs.card_id = c.id AND cs.set_id = %s)"
        )
        params.append(set_id.upper())

    if color:
        conditions.append("%s = ANY(c.colors)")
        params.append(color.capitalize())

    if category:
        conditions.append("c.category ILIKE %s")
        params.append(category)

    if rarity:
        conditions.append("c.rarity ILIKE %s")
        params.append(rarity)

    if name:
        conditions.append("c.name ILIKE %s")
        params.append(f"%{name}%")

    if parallel is not None:
        conditions.append("c.parallel = %s")
        params.append(parallel)

    if variant_type:
        conditions.append("c.variant_type ILIKE %s")
        params.append(variant_type)

    if min_power is not None:
        conditions.append("c.power >= %s")
        params.append(min_power)

    if max_power is not None:
        conditions.append("c.power <= %s")
        params.append(max_power)

    if min_cost is not None:
        conditions.append("c.cost >= %s")
        params.append(min_cost)

    if max_cost is not None:
        conditions.append("c.cost <= %s")
        params.append(max_cost)

    where  = ("WHERE " + " AND ".join(conditions)) if conditions else ""
    offset = (page - 1) * page_size

    total_row = fetch_one(f"SELECT COUNT(*) AS total FROM cards c {where}", params)
    total     = total_row["total"]

    cards = fetch(f"""
        SELECT c.*
        FROM cards c
        {where}
        ORDER BY c.id
        LIMIT %s OFFSET %s
    """, params + [page_size, offset])

    return {
        "count":      len(cards),
        "totalCount": total,
        "page":       page,
        "pageSize":   page_size,
        "data":       cards,
    }


@app.get(
    "/images/{card_id}",
    tags=["Images"],
    summary="Proxy Card Image",
    description=(
        "Fetches the card image from the official One Piece Card Game site and serves it "
        "with CORS headers and a 24-hour cache.\n\n"
        "**Example:** `/images/OP01-001` returns the PNG artwork for that card.\n\n"
        "Returns `404` if the card image does not exist upstream."
    ),
)
async def proxy_image(card_id: str):
    import httpx
    from fastapi.responses import Response
    url = f"https://en.onepiece-cardgame.com/images/cardlist/card/{card_id}.png"
    async with httpx.AsyncClient() as client:
        r = await client.get(url, headers={"Referer": "https://en.onepiece-cardgame.com/"}, follow_redirects=True)
    if r.status_code != 200:
        return Response(status_code=404)
    return Response(content=r.content, media_type="image/png", headers={"Cache-Control": "public, max-age=86400", "Access-Control-Allow-Origin": "*"})