#!/usr/bin/env python3
"""
patch_websocket_hub.py
──────────────────────
Injects TradeLogParser (from hub_dashboard_service.py) and four API routes
into /app/websocket_hub.py so that port 7860 serves:

  GET /api/trades          → full open + closed state + stats
  GET /api/trades/open     → open trades only
  GET /api/trades/closed   → recent closed trades + stats  (?limit=N, default 50)
  GET /api/health          → service health including trade counts

Usage:
    python3 patch_websocket_hub.py [--target /app/websocket_hub.py] [--dry-run]
"""

import argparse
import shutil
import sys
from datetime import datetime
from pathlib import Path

# ── Snippet 1: Parser instantiation block ─────────────────────────────────────
# Inserted BEFORE  `_START_TIME = time.time()`
PARSER_BLOCK = '''
# ── Trade log parser — injected so /api/trades is served on port 7860 ────────
import sys as _sys, os as _os
_sys.path.insert(0, '/app')
from hub_dashboard_service import TradeLogParser as _TradeLogParser
_trade_parser = _TradeLogParser(log_dir=_os.environ.get("RANKER_LOG_DIR", "/app/ranker_logs"))
_trade_parser.start_background()
'''

# ── Snippet 2: FastAPI route definitions ──────────────────────────────────────
# Appended AFTER  `_START_TIME = time.time()`
TRADE_ROUTES = '''

# ── /api/trades routes — injected by patch_websocket_hub.py ──────────────────
@app.get("/api/trades")
async def api_trades():
    """Full trade state: open trades, recent closed trades, summary stats."""
    return JSONResponse(_trade_parser.get_state())


@app.get("/api/trades/open")
async def api_trades_open():
    """Open trades only."""
    state = _trade_parser.get_state()
    return JSONResponse({"open": state["open"]})


@app.get("/api/trades/closed")
async def api_trades_closed(limit: int = 50):
    """Recent closed trades (newest first) + cumulative stats."""
    state = _trade_parser.get_state()
    return JSONResponse({
        "closed": state["closed"][:limit],
        "stats":  state["stats"],
    })


@app.get("/api/health")
async def api_health():
    """Service health check — includes live trade counts and log-file inventory."""
    import glob as _glob
    return JSONResponse({
        "service":      "websocket_hub",
        "version":      "v2.0",
        "status":       "running",
        "log_files":    len(_glob.glob("/app/ranker_logs/*.log")),
        "trade_open":   len(_trade_parser.get_state()["open"]),
        "trade_closed": len(_trade_parser.get_state()["closed"]),
    })
'''

ANCHOR = "_START_TIME = time.time()"


def patch(source: str) -> str:
    """Apply both substitutions and return the patched source."""
    if ANCHOR not in source:
        raise ValueError(
            f"Anchor '{ANCHOR}' not found in source — "
            "is this the right file?"
        )

    # Count occurrences so we can give a clear warning if there are multiples.
    count = source.count(ANCHOR)
    if count > 1:
        print(
            f"[WARNING] Anchor appears {count} times; "
            "only the first occurrence will be modified.",
            file=sys.stderr,
        )

    # ── Step 1: prepend the parser block before the anchor ────────────────────
    src = source.replace(ANCHOR, PARSER_BLOCK + ANCHOR, 1)

    # ── Step 2: append trade routes after the (now-unique) anchor ────────────
    #   After step 1, ANCHOR still appears exactly once (at the end of the
    #   inserted block), so a second replace(…, 1) is safe.
    src = src.replace(ANCHOR, ANCHOR + TRADE_ROUTES, 1)

    return src


def main() -> None:
    ap = argparse.ArgumentParser(description="Patch websocket_hub.py with trade routes.")
    ap.add_argument(
        "--target",
        default="/app/websocket_hub.py",
        help="Path to websocket_hub.py (default: /app/websocket_hub.py)",
    )
    ap.add_argument(
        "--dry-run",
        action="store_true",
        help="Print the patched source to stdout instead of writing to disk.",
    )
    args = ap.parse_args()

    target = Path(args.target)

    if not target.exists():
        print(f"[ERROR] Target file not found: {target}", file=sys.stderr)
        sys.exit(1)

    original = target.read_text(encoding="utf-8")

    # Guard: don't double-patch
    if "_trade_parser" in original:
        print(
            "[SKIP] Patch already applied (_trade_parser already present in file).",
            file=sys.stderr,
        )
        sys.exit(0)

    patched = patch(original)

    if args.dry_run:
        print(patched)
        return

    # ── Backup the original ───────────────────────────────────────────────────
    ts = datetime.now().strftime("%Y%m%d_%H%M%S")
    backup = target.with_suffix(f".bak_{ts}.py")
    shutil.copy2(target, backup)
    print(f"[INFO] Backup written → {backup}")

    target.write_text(patched, encoding="utf-8")
    print(f"[OK] Patch applied → {target}")
    print(f"     Routes added:  /api/trades  /api/trades/open  /api/trades/closed  /api/health")


if __name__ == "__main__":
    main()