"""
server.py - custom Spectrum 2 frontend for Gradio Server mode.

This is the Off-Brand entry point: instead of the default Gradio component
render, a gradio.Server instance serves the hand-built React UI
(ui_kits/chan-compass/) and exposes the unchanged Python backend as JSON/SSE
endpoints. The HF Space uses sdk: gradio and runs app.py, which calls
app.launch().

Architecture:
    gradio.Server app
      /api/...   -> JSON + Server-Sent-Events endpoints calling the backend
      /          -> the React frontend (static), Spectrum 2 design system

Backend modules (signal_runner, rotation, news_watch, research_agent,
automation, emailer, finetune_data, llm_local) are imported and called with no
business-logic changes.
"""
from __future__ import annotations

import json
import os

from fastapi import Request
from fastapi.responses import StreamingResponse, JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from gradio import Server

import paths  # sets up /data, sys.path
import automation
import signal_runner
import rotation
import news_watch
import research_agent
import emailer
import finetune_data
import llm_local

HERE = os.path.dirname(os.path.abspath(__file__))
UI_DIR = os.path.join(HERE, "ui_kits", "chan-compass")

app = Server(title="Chan Compass · US")


# ───────────────────────── helpers ─────────────────────────
def _sse(gen):
    """Wrap a text generator as Server-Sent Events (one 'data:' per chunk)."""
    def stream():
        for chunk in gen:
            yield f"data: {json.dumps({'text': chunk})}\n\n"
        yield "event: done\ndata: {}\n\n"
    return StreamingResponse(stream(), media_type="text/event-stream")


def _df_records(df):
    if df is None or not hasattr(df, "to_dict"):
        return []
    return df.to_dict(orient="records")


# ───────────────────────── Signals ─────────────────────────
@app.get("/api/last-results")
async def last_results():
    return JSONResponse(automation.load_results())


@app.post("/api/signals/run")
async def signals_run(req: Request):
    body = await req.json()
    tickers = [t.strip().upper() for t in
               (body.get("pool") or "").replace("\n", ",").split(",") if t.strip()]
    force = bool(body.get("force"))
    df, details, summary, errors = signal_runner.run_signals(tickers or None, force=force)
    automation.STATE["signals_df"] = df
    automation.STATE["signals_details"] = details
    automation.STATE["signals_summary"] = summary
    return JSONResponse({"rows": _df_records(df), "summary": summary,
                         "tickers": sorted(details.keys())})


@app.get("/api/signals/raw")
async def signals_raw(ticker: str):
    return JSONResponse({"raw": signal_runner.stock_raw_read(ticker)})


@app.get("/api/signals/summary")
async def signals_summary(ticker: str):
    raw = signal_runner.stock_raw_read(ticker or "")
    if not raw:
        return _sse(iter(["Run the analysis and select a ticker first."]))
    chain = automation.STATE.get("signals_details", {}).get(ticker or "", "")
    chain_core = chain.split("日线买卖点逐项诊断")[0].strip()[:2000] if chain else ""
    prompt = ("You are an equity analyst. Write a SHORT plain-English summary "
              "(≤100 words) for a long-term holder of a US stock: the situation "
              "today, whether to act or wait, and the key price levels.\n"
              "Use the FACT LINE for the numbers, and the RULING CHAIN (a Chinese "
              "multi-timeframe Chan-theory decision log) for the reasoning — "
              "translate and synthesize it; output ENGLISH ONLY, no Chinese "
              "characters, do not quote the log, no disclaimers.\n\n"
              f"FACT LINE:\n{raw}")
    if chain_core:
        prompt += f"\n\nRULING CHAIN (translate & synthesize, don't quote):\n{chain_core}"

    def gen():
        final = ""
        for acc in llm_local.chat_stream(prompt, max_tokens=240, temperature=0.2,
                                         worker="interpreter"):
            final = acc
            yield acc
        try:
            finetune_data.record(raw, final)
        except Exception:
            pass
    return _sse(gen())


# ───────────────────────── Sector Rotation ─────────────────────────
@app.get("/api/rotation")
async def rotation_tables():
    d1, d5, d20, asof = rotation.build_rotation(force=True)
    automation.STATE["rotation"] = (d1, d5, d20, asof)
    return JSONResponse({
        "asof": asof,
        "d1": _df_records(rotation.fmt_table(d1)),
        "d5": _df_records(rotation.fmt_table(d5)),
        "d20": _df_records(rotation.fmt_table(d20)),
    })


@app.get("/api/rotation/narrative")
async def rotation_narrative():
    rot = automation.STATE.get("rotation")
    if not rot or rot[0] is None:
        return _sse(iter(["Refresh the rotation tables first."]))
    d1, d5, d20, _ = rot
    brief = rotation.rotation_brief(d1, d5, d20)
    prompt = ("You are a US equity market strategist. Based only on the sector flow "
              "data below (SPDR ETF proxy: change% × dollar volume, plus RS vs SPY), "
              "write a crisp brief (<150 words): 1) where capital is rotating "
              "INTO/OUT OF; 2) do 1-day moves agree with the 5/20-day trend; 3) one "
              "watch item. No disclaimers.\n\nDATA:\n" + brief[:2200])
    return _sse(llm_local.chat_stream(prompt, max_tokens=340, worker="narrator"))


# ───────────────────────── Watchlist News ─────────────────────────
@app.get("/api/news/holdings")
async def news_holdings():
    return JSONResponse({"holdings": news_watch.load_holdings()})


@app.post("/api/news/save")
async def news_save(req: Request):
    body = await req.json()
    tickers = [t.strip().upper() for t in
               (body.get("holdings") or "").replace("\n", ",").split(",") if t.strip()]
    news_watch.save_holdings(tickers)
    return JSONResponse({"saved": tickers})


@app.get("/api/news/check")
async def news_check():
    return _sse(news_watch.check_holdings_news_stream())


# ───────────────────────── Auto Research ─────────────────────────
@app.get("/api/research/run")
async def research_run(ticker: str):
    def gen():
        last_report = ""
        for progress, report in research_agent.run_research_stream(ticker):
            last_report = report
            yield json.dumps({"progress": progress, "report": report})
        yield json.dumps({"progress": "__done__", "report": last_report,
                          "reports": research_agent.list_reports()})

    def stream():
        for chunk in gen():
            yield f"data: {chunk}\n\n"
        yield "event: done\ndata: {}\n\n"
    return StreamingResponse(stream(), media_type="text/event-stream")


@app.get("/api/research/reports")
async def research_reports():
    return JSONResponse({"reports": research_agent.list_reports()})


@app.get("/api/research/report")
async def research_report(name: str):
    return JSONResponse({"markdown": research_agent.read_report(name)})


# ───────────────────────── Automation ─────────────────────────
@app.post("/api/automation/run")
async def automation_run():
    import threading
    if automation.STATE.get("running"):
        return JSONResponse({"message": "Pipeline already running — watch the log."})
    threading.Thread(target=lambda: automation.run_pipeline(force=True), daemon=True).start()
    return JSONResponse({"message": "Pipeline started — the log updates live below."})


@app.get("/api/automation/state")
async def automation_state():
    return JSONResponse({
        "log": automation.STATE.get("log", [])[-40:],
        "schedule": automation.schedule_info(),
        "traces": research_agent.list_traces(),
        "running": bool(automation.STATE.get("running")),
    })


@app.post("/api/automation/publish-traces")
async def automation_publish(req: Request):
    body = await req.json()
    import trace_publish
    return JSONResponse({"status": trace_publish.publish_traces(body.get("repo", ""))})


# ───────────────────────── Model ─────────────────────────
@app.get("/api/market/status")
async def market_status():
    import datetime as dt
    try:
        from zoneinfo import ZoneInfo
        now = dt.datetime.now(ZoneInfo("America/New_York"))
    except Exception:
        now = dt.datetime.utcnow()
    wd = now.weekday()  # 0=Mon … 6=Sun
    minutes = now.hour * 60 + now.minute
    is_weekday = wd < 5
    # regular session 9:30–16:00 ET
    is_open = is_weekday and (9*60+30) <= minutes < (16*60)
    if is_open:
        label, variant = "Market open", "positive"
    elif is_weekday and minutes < (9*60+30):
        label, variant = "Pre-market", "notice"
    elif is_weekday and minutes >= (16*60):
        label, variant = "After hours", "notice"
    else:
        label, variant = "Market closed · weekend", "neutral"
    return JSONResponse({"open": is_open, "label": label, "variant": variant})


@app.get("/api/model/list")
async def model_list():
    return JSONResponse({
        "models": list(llm_local.MODEL_ZOO.keys()),
        "analyst": llm_local.WORKERS["analyst"]["model"],
        "analyst_ready": llm_local.WORKERS["analyst"]["llm"] is not None,
    })


@app.post("/api/model/load")
async def model_load(req: Request):
    body = await req.json()
    name = body.get("model", "")
    if name not in llm_local.MODEL_ZOO:
        return JSONResponse({"status": "⚠️ Unknown model."})
    import threading
    threading.Thread(target=lambda: llm_local.load_model(name, worker="analyst"),
                     daemon=True).start()
    return JSONResponse({"status": f"⏳ Loading {name} onto the Analyst sub-agent…"})


@app.get("/api/model/status")
async def model_status():
    return JSONResponse({
        "status": llm_local.status(),
        "workers": {k: {"model": w["model"], "ready": w["llm"] is not None,
                        "stage": w["stage"]}
                    for k, w in llm_local.WORKERS.items()},
    })


_SELFTEST = {"running": False, "result": ""}


@app.post("/api/model/test")
async def model_test():
    import threading
    if _SELFTEST["running"]:
        return JSONResponse({"started": True, "running": True})

    def _run():
        _SELFTEST["running"] = True
        _SELFTEST["result"] = ""
        try:
            _SELFTEST["result"] = llm_local.quick_test()
        except Exception as e:
            _SELFTEST["result"] = f"❌ {e}"
        _SELFTEST["running"] = False

    threading.Thread(target=_run, daemon=True).start()
    return JSONResponse({"started": True, "running": True})


@app.get("/api/model/test-status")
async def model_test_status():
    return JSONResponse({"running": _SELFTEST["running"], "result": _SELFTEST["result"]})


@app.get("/api/model/finetune-status")
async def finetune_status():
    return JSONResponse({"status": finetune_data.status_line(),
                         "count": finetune_data.count()})


@app.post("/api/model/export-dataset")
async def export_dataset():
    path = finetune_data.export()
    if not path:
        return JSONResponse({"path": "", "count": 0, "download": ""})
    # Copy into a WRITABLE served dir. In Docker, /app is read-only for the
    # non-root user, so use /data (persistent) when available, else the temp dir.
    import shutil
    import tempfile
    base = paths.DATA_ROOT if paths.PERSISTENT else tempfile.gettempdir()
    served_dir = os.path.join(base, "exports")
    try:
        os.makedirs(served_dir, exist_ok=True)
    except OSError:
        served_dir = tempfile.gettempdir()
    fname = os.path.basename(path)
    try:
        shutil.copy(path, os.path.join(served_dir, fname))
    except OSError:
        pass
    return JSONResponse({"path": path, "count": finetune_data.count(),
                         "download": "/download/" + fname})


@app.get("/download/{fname}")
async def download_file(fname: str):
    import tempfile
    base = paths.DATA_ROOT if paths.PERSISTENT else tempfile.gettempdir()
    fname = os.path.basename(fname)
    for d in (os.path.join(base, "exports"), os.path.join(tempfile.gettempdir(), "exports"),
              tempfile.gettempdir()):
        served = os.path.join(d, fname)
        if os.path.exists(served):
            return FileResponse(served, filename=fname, media_type="application/jsonl")
    return JSONResponse({"error": "not found"}, status_code=404)


# ───────────────────────── Email (all tabs) ─────────────────────────
@app.post("/api/email")
async def send_email(req: Request):
    body = await req.json()
    status = emailer.send_result(body.get("content", ""), body.get("to", ""),
                                 body.get("tag", "Chan Compass"))
    return JSONResponse({"status": status})


# ───────────────────────── startup ─────────────────────────
def _boot():
    try:
        automation._SCHED = automation.start_scheduler()
    except Exception:
        pass
    if os.environ.get("AUTO_LOAD_MODEL", "1") == "1":
        import threading
        threading.Thread(target=llm_local.auto_load_all, daemon=True).start()


# Static frontend mounted LAST so /api/* and /download/* win.
app.mount("/", StaticFiles(directory=UI_DIR, html=True), name="ui")


@app.middleware("http")
async def _no_cache_assets(request, call_next):
    resp = await call_next(request)
    p = request.url.path
    if p.endswith((".jsx", ".js", ".css", ".html")) or p == "/":
        resp.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
        resp.headers["Pragma"] = "no-cache"
        resp.headers["Expires"] = "0"
    return resp

# Boot background services at import time (uvicorn serves `app` directly).
_boot()

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0",
                port=int(os.environ.get("PORT", "7860")))