"""KOL post → structured signal extractor.

Takes a long-form post (Substack essay) or tweet and returns:
  - summary:  one Chinese sentence on what this post is about
  - tickers:  list of {ticker, action, conviction, quote}

action ∈ bullish | bearish | buy | sell | mention
  - buy/sell  → KOL explicitly states they bought/sold or are entering/exiting
  - bullish/bearish → directional view without an explicit position statement
  - mention   → ticker appears but no clear stance (don't flood with these)

conviction ∈ 0.0–1.0
  - 0.8+  : explicit, repeated, with sizing / timing
  - 0.5–0.7 : clear view, no commitment
  - <0.5  : passing reference

Quote is the shortest verbatim sentence supporting the call.

Uses the same Anthropic client style as analysis.py. Designed to be reused
by the Trump-post AI signal module (TODO #4) — same JSON shape, just with
different KOL context strings.
"""

from __future__ import annotations

import json
import logging
from datetime import datetime, timezone
from typing import Optional

from openai import AsyncOpenAI

from app.config import settings

logger = logging.getLogger(__name__)

ANALYSIS_VERSION = "kol-v1"
ANTHROPIC_MODEL = "claude-haiku-4-5-20251001"

_anthropic_client = None
_openai_client: Optional[AsyncOpenAI] = None


def _use_anthropic() -> bool:
    return bool(settings.anthropic_api_key)


def _anth():
    global _anthropic_client
    if _anthropic_client is None:
        import anthropic as _a
        _anthropic_client = _a.AsyncAnthropic(api_key=settings.anthropic_api_key)
    return _anthropic_client


def _oai() -> AsyncOpenAI:
    global _openai_client
    if _openai_client is None:
        _openai_client = AsyncOpenAI(
            api_key=settings.ai_api_key,
            base_url=settings.ai_base_url,
        )
    return _openai_client


SYSTEM_PROMPT = """You are an analyst extracting tradeable signals from crypto KOL posts.

The author is a known crypto KOL. Your job: distill what they said and which tokens they are talking about RIGHT NOW (not historical references).

Output **strict JSON only**, no markdown, no preface. Schema:

{
  "summary": "<one sentence, ≤60 chars/字. If signal exists, state the author's current thesis. If no signal, describe the post topic. Match the post's primary language (中文文章用中文, English 用英文).>",
  "tickers": [
    {
      "ticker":     "<UPPERCASE symbol, e.g. BTC, ETH, HYPE, SOL>",
      "action":     "buy" | "sell" | "bullish" | "bearish" | "mention",
      "conviction": <float 0.0-1.0>,
      "quote":      "<shortest verbatim sentence from the post supporting this call, ≤200 chars. Use the post's original language — do not translate.>"
    }
  ]
}

Rules:
- If the post is macro commentary, news recap, or sponsored content with no specific token call, return tickers=[] and summary describing the topic.
- IGNORE historical price references ("BTC bottomed at $60k earlier this year") — these are context, not current calls.
- IGNORE advertising/sponsor sections — look for cues: "sponsor", "partner", "use code", "promo code", "this episode brought to you by", "ad", "广告", "赞助". Skip any ticker only mentioned inside such a section.
- buy/sell only when the author states a position action ("I bought", "we are long", "我们减仓了", "added to my bag"). Otherwise use bullish/bearish for directional views, or mention for passing references.
- Dedupe per ticker — at most one entry per symbol; pick the strongest action.
- Do NOT invent tickers. If you see "$XYZ" but unsure it's a real token, skip it.
- conviction: 0.8+ requires explicit + repeated + sized/timed view; 0.5-0.7 for clear directional view without commitment; <0.5 for passing references.
- Do not include fiat (USD/CNY/JPY) or stablecoins (USDT/USDC/DAI/FRAX) unless the post's main thesis is about them.
"""


USER_TEMPLATE = """Today is {today_utc}.
KOL handle: {handle}
Source: {source}
Title: {title}

Post body:
\"\"\"
{body}
\"\"\"
"""


def _truncate(text: str, max_chars: int = 24000) -> str:
    """Substack essays can be 50K+ chars. Haiku handles it but we cap to
    control cost. Keep head + tail since conclusions often appear at the end."""
    if len(text) <= max_chars:
        return text
    head = max_chars * 2 // 3
    tail = max_chars - head
    return text[:head] + "\n\n[...trimmed...]\n\n" + text[-tail:]


def _parse_json(raw: str) -> dict:
    raw = raw.strip()
    if raw.startswith("```"):
        # strip fenced code block
        raw = raw.split("\n", 1)[1] if "\n" in raw else raw
        if raw.endswith("```"):
            raw = raw.rsplit("```", 1)[0]
        raw = raw.strip()
    # Some models prepend "json" after the fence
    if raw.startswith("json"):
        raw = raw[4:].strip()
    return json.loads(raw)


async def extract_kol_signal(
    *,
    handle: str,
    source: str,
    title: Optional[str],
    body: str,
    model: Optional[str] = None,
) -> dict:
    """Run the extractor. Returns {summary, tickers, model, version}.

    Returns an empty-but-valid dict on parse/API failure rather than raising —
    the caller stores the post regardless; an unanalyzed post can be retried.
    """
    today_utc = datetime.now(timezone.utc).strftime("%Y-%m-%d")
    user = USER_TEMPLATE.format(
        today_utc=today_utc,
        handle=handle,
        source=source,
        title=title or "",
        body=_truncate(body),
    )

    use_anth = _use_anthropic()
    if model is None:
        # KOL analysis is a daily batch job, not latency-sensitive. Use the
        # higher-quality `ai_model` (DeepSeek v4 Pro / reasoning) rather than
        # the live `ai_live_model` (flash) reserved for Trump real-time path.
        model = ANTHROPIC_MODEL if use_anth else settings.ai_model

    try:
        if use_anth:
            msg = await _anth().messages.create(
                model=model,
                max_tokens=1500,
                temperature=0.1,
                system=SYSTEM_PROMPT,
                messages=[{"role": "user", "content": user}],
            )
            raw = (msg.content[0].text if msg.content else "").strip()
        else:
            # OpenAI-compatible (DeepSeek). Reasoning models need higher tokens
            # + no temperature; flash/chat models are fine with both.
            is_reasoning = any(x in model for x in ("pro", "reasoner", "r1", "think"))
            kwargs = {"model": model, "messages": [
                {"role": "system", "content": SYSTEM_PROMPT},
                {"role": "user", "content": user},
            ], "max_tokens": 4000 if is_reasoning else 1500}
            if not is_reasoning:
                kwargs["temperature"] = 0.1
            # JSON mode — DeepSeek + OpenAI both support response_format.
            # Eliminates fenced/preface parse failures. Skipped for reasoning
            # models (some don't accept response_format alongside reasoning).
            if not is_reasoning:
                kwargs["response_format"] = {"type": "json_object"}
            resp = await _oai().chat.completions.create(**kwargs)
            raw = (resp.choices[0].message.content or "").strip()
        data = _parse_json(raw)
    except Exception as e:
        logger.warning("kol_analysis extract failed for %s: %s", handle, e)
        return {"summary": None, "tickers": [], "model": model,
                "version": ANALYSIS_VERSION, "error": str(e)}

    # Normalize
    tickers = data.get("tickers") or []
    cleaned = []
    for t in tickers:
        if not isinstance(t, dict):
            continue
        sym = (t.get("ticker") or "").strip().upper()
        if not sym or len(sym) > 12:
            continue
        action = (t.get("action") or "mention").lower()
        if action not in {"buy", "sell", "bullish", "bearish", "mention"}:
            action = "mention"
        try:
            conv = float(t.get("conviction") or 0)
        except (TypeError, ValueError):
            conv = 0.0
        conv = max(0.0, min(1.0, conv))
        cleaned.append({
            "ticker": sym,
            "action": action,
            "conviction": round(conv, 2),
            "quote": (t.get("quote") or "")[:200],
        })

    return {
        "summary": (data.get("summary") or "").strip() or None,
        "tickers": cleaned,
        "model": model,
        "version": ANALYSIS_VERSION,
    }