from __future__ import annotations

from fastapi import FastAPI
from mcp.server.fastmcp import FastMCP
from mcp.server.transport_security import TransportSecuritySettings

from trends_mcp.aliases import normalize_entity
from trends_mcp.cache import cache_stats, get_cache, set_cache
from trends_mcp.ledger import entity_history, prune_snapshots, read_recent, store_snapshot, summarize
from trends_mcp.providers.google_trends import GoogleTrendsError, GoogleTrendsProvider


mcp = FastMCP(
    "trends-mcp",
    transport_security=TransportSecuritySettings(enable_dns_rebinding_protection=False),
)

provider = GoogleTrendsProvider()
CACHE_TTL_SECONDS = 30 * 60


def _trend_label(series: list[int]) -> str:
    if not series:
        return "flat"
    first, last = series[0], series[-1]
    if last - first >= 10:
        return "rising"
    if first - last >= 10:
        return "falling"
    return "flat"


@mcp.tool(description="Experimental: show attention trend for a keyword or entity over time.")
async def get_interest_over_time(keyword: str, timeframe: str = "7d"):
    keyword_norm = normalize_entity(keyword)
    cache_key = f"interest:{keyword_norm}:{timeframe}"
    cached = get_cache(cache_key)
    if cached:
        return cached

    try:
        result = provider.interest_over_time(keyword, timeframe)
    except GoogleTrendsError as exc:
        return {
            "keyword": keyword,
            "normalized_keyword": keyword_norm,
            "timeframe": timeframe,
            "error": str(exc),
        }

    payload = {
        "keyword": keyword,
        "normalized_keyword": keyword_norm,
        "timeframe": timeframe,
        "series": result.series,
        "trend": _trend_label(result.series),
        "fetched_at": result.fetched_at,
    }
    set_cache(cache_key, payload, CACHE_TTL_SECONDS)
    return payload


@mcp.tool(description="Resolve an entity to Knowledge Graph MID candidates and a best canonical label.")
async def resolve_entity(keyword: str):
    cache_key = f"resolve:{normalize_entity(keyword)}"
    cached = get_cache(cache_key)
    if cached:
        return cached
    suggestions = provider.suggestions(keyword)
    best = suggestions[0] if suggestions else None
    payload = {
        "keyword": keyword,
        "canonical_label": best.get("title") if best else normalize_entity(keyword),
        "mid": best.get("mid") if best else None,
        "type": best.get("type") if best else None,
        "candidates": suggestions,
    }
    set_cache(cache_key, payload, 24 * 60 * 60)
    store_snapshot(
        tool="resolve_entity",
        keyword=keyword,
        normalized_keyword=normalize_entity(keyword),
        mid=payload["mid"],
        canonical_label=payload["canonical_label"],
        payload=payload,
    )
    return payload


@mcp.tool(description="Get related search queries for an entity.")
async def get_related_queries(keyword: str):
    cache_key = f"related:{normalize_entity(keyword)}"
    cached = get_cache(cache_key)
    if cached:
        return cached
    related = provider.related_queries(keyword)
    out = related.get(keyword) or related.get(normalize_entity(keyword)) or {}

    def _rows(df):
        if df is None:
            return []
        try:
            return df.reset_index().to_dict(orient="records")
        except Exception:
            return []

    payload = {
        "keyword": keyword,
        "top": _rows(out.get("top") if isinstance(out, dict) else None),
        "rising": _rows(out.get("rising") if isinstance(out, dict) else None),
    }
    set_cache(cache_key, payload, 24 * 60 * 60)
    store_snapshot(
        tool="get_related_queries",
        keyword=keyword,
        normalized_keyword=normalize_entity(keyword),
        mid=None,
        canonical_label=None,
        payload=payload,
    )
    return payload


@mcp.tool(description="Get related topics for an entity.")
async def get_related_topics(keyword: str):
    cache_key = f"topics:{normalize_entity(keyword)}"
    cached = get_cache(cache_key)
    if cached:
        return cached
    try:
        related = provider.related_topics(keyword)
        out = related.get(keyword) or related.get(normalize_entity(keyword)) or {}
    except GoogleTrendsError:
        # pytrends' related_topics is flaky; fall back to related_queries so the tool stays useful.
        related = provider.related_queries(keyword)
        out = related.get(keyword) or related.get(normalize_entity(keyword)) or {}

    def _rows(df):
        if df is None:
            return []
        try:
            return df.reset_index().to_dict(orient="records")
        except Exception:
            return []

    payload = {
        "keyword": keyword,
        "top": _rows(out.get("top") if isinstance(out, dict) else None),
        "rising": _rows(out.get("rising") if isinstance(out, dict) else None),
    }
    set_cache(cache_key, payload, 24 * 60 * 60)
    store_snapshot(
        tool="get_related_topics",
        keyword=keyword,
        normalized_keyword=normalize_entity(keyword),
        mid=None,
        canonical_label=None,
        payload=payload,
    )
    return payload


@mcp.tool(description="Read the most recent ledger events.")
async def get_ledger_recent(limit: int = 50):
    return read_recent(limit=max(1, min(int(limit), 200)))


@mcp.tool(description="Summarize what the ledger is saying.")
async def get_ledger_summary(limit: int = 500):
    return summarize(limit=max(1, min(int(limit), 2000)))


@mcp.tool(description="Show the ledger history for one entity or MID.")
async def get_entity_history(entity: str, limit: int = 500):
    return entity_history(entity, limit=max(1, min(int(limit), 2000)))


@mcp.tool(description="Prune stored snapshots older than the configured retention window.")
async def prune_history(retention_days: int = 30):
    deleted = prune_snapshots(retention_days=max(1, min(int(retention_days), 3650)))
    return {"deleted": deleted, "retention_days": retention_days}


@mcp.tool(description="Compare attention between multiple keywords or entities.")
async def compare_interest(keywords: list[str], timeframe: str = "7d"):
    if not keywords:
        return {"winner": None, "ratios": {}}

    normalized = [normalize_entity(k) for k in keywords]
    series_map = {}
    for original, keyword in zip(keywords, normalized):
        cache_key = f"interest:{keyword}:{timeframe}"
        cached = get_cache(cache_key)
        if cached:
            series = cached["series"]
        else:
            series = provider.interest_over_time(original, timeframe).series
            set_cache(
                cache_key,
                {
                    "keyword": original,
                    "normalized_keyword": keyword,
                    "timeframe": timeframe,
                    "series": series,
                    "trend": _trend_label(series),
                },
                CACHE_TTL_SECONDS,
            )
        series_map[keyword] = series

    scores = {k: sum(v) for k, v in series_map.items()}
    winner = max(scores, key=scores.get)
    top_score = float(scores[winner]) or 1.0
    ratios = {k: round(v / top_score, 3) for k, v in scores.items()}
    return {"winner": winner, "ratios": ratios, "timeframe": timeframe}


@mcp.tool(description="Get a compact attention score for a known entity.")
async def get_attention_score(entity: str, timeframe: str = "24h"):
    normalized = normalize_entity(entity)
    try:
        series = provider.interest_over_time(entity, timeframe).series
    except GoogleTrendsError as exc:
        return {"entity": entity, "normalized_entity": normalized, "error": str(exc), "timeframe": timeframe}
    score = round(sum(series) / (len(series) * 100), 3)
    baseline = round(series[-1] / max(1, series[0]), 3) if series[0] else float(series[-1])
    return {
        "entity": entity,
        "normalized_entity": normalized,
        "score": score,
        "relative_to_baseline": baseline,
        "timeframe": timeframe,
    }


app = FastAPI(title="Trends MCP Server")
app.mount("/mcp", mcp.sse_app())


@app.get("/")
def root():
    return {
        "status": "ok",
        "transport": "fastmcp+sse",
        "mount": "/mcp",
        "tools": ["resolve_entity", "get_related_queries", "get_related_topics", "get_ledger_recent", "get_ledger_summary", "get_entity_history", "prune_history", "get_interest_over_time", "compare_interest", "get_attention_score"],
    }


@mcp.tool(description="Debug Google Trends connectivity, suggestions, and timeframe handling.")
async def debug_google_trends(keyword: str, timeframe: str = "7d"):
    keyword_norm = normalize_entity(keyword)
    try:
        suggestions = provider.suggestions(keyword)
    except GoogleTrendsError as exc:
        suggestions = {"error": str(exc)}

    try:
        result = provider.interest_over_time(keyword, timeframe)
        payload = {
            "keyword": keyword,
            "normalized_keyword": keyword_norm,
            "timeframe": timeframe,
            "suggestions": suggestions,
            "series": result.series,
            "trend": _trend_label(result.series),
            "fetched_at": result.fetched_at,
        }
    except GoogleTrendsError as exc:
        payload = {
            "keyword": keyword,
            "normalized_keyword": keyword_norm,
            "timeframe": timeframe,
            "suggestions": suggestions,
            "error": str(exc),
        }
    return payload


@app.get("/health")
def health():
    return {"status": "ok", "service": "trends-mcp", "cache": cache_stats()}


def main():
    import uvicorn

    uvicorn.run("trends_mcp.mcp_server_fastmcp:app", host="0.0.0.0", port=8507, reload=False)


if __name__ == "__main__":
    main()