import requests as http_requests
import json

from django.http import HttpResponse, StreamingHttpResponse
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.decorators import parser_classes
from rest_framework.parsers import FormParser, MultiPartParser
from rest_framework.response import Response

from .analysis_service import run_agentic_analysis
from .financial_models import ALL_MODELS, run_model as run_financial_model
from .risk_management_service import run_portfolio_risk_analysis
from .agent_tools_service import run_agent_tool_chat
from .claude_agent_service import run_agent_chat
from .services import run_chat_completion, run_chat_completion_stream
from .excel_export_service import generate_xlsx
from .report_export_service import generate_docx
from .slides_export_service import generate_pptx


@api_view(["POST"])
def chat_completion(request):
    user_message = str(request.data.get("message", "")).strip()
    if not user_message:
        return Response(
            {"detail": "Request body must include a non-empty 'message' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    try:
        result = run_chat_completion(user_message)
    except ValueError as exc:
        return Response({"detail": str(exc)}, status=status.HTTP_400_BAD_REQUEST)
    except Exception as exc:
        return Response(
            {"detail": "Cerebras chat completion failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    return Response(
        {
            "status": "ok",
            "model": result["model"],
            "content": result["content"],
        }
    )


@api_view(["POST"])
def chat_completion_stream(request):
    user_message = str(request.data.get("message", "")).strip()
    if not user_message:
        return Response(
            {"detail": "Request body must include a non-empty 'message' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    try:
        stream = run_chat_completion_stream(user_message)
    except ValueError as exc:
        return Response({"detail": str(exc)}, status=status.HTTP_400_BAD_REQUEST)
    except Exception as exc:
        return Response(
            {"detail": "Cerebras stream initialization failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    response = StreamingHttpResponse(stream, content_type="text/plain; charset=utf-8")
    response["Cache-Control"] = "no-cache"
    response["X-Accel-Buffering"] = "no"
    return response


@api_view(["POST"])
@parser_classes([MultiPartParser, FormParser])
def analyze_document(request):
    uploaded_file = request.FILES.get("file")
    if uploaded_file is None:
        return Response(
            {"detail": "Request must include a PDF file in the 'file' form field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    if uploaded_file.content_type and uploaded_file.content_type != "application/pdf":
        return Response(
            {"detail": "Only PDF uploads are supported for analysis."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    headline = str(request.data.get("headline", "")).strip()
    try:
        payload = run_agentic_analysis(uploaded_file.read(), headline)
    except Exception as exc:
        return Response(
            {"detail": "Agentic analysis failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    return Response(
        {
            "status": "ok",
            "analysis": payload,
        }
    )


def _extract_json_payload(raw_text: str):
    raw_text = (raw_text or "").strip()
    if not raw_text:
        return None

    if raw_text.startswith("```"):
        raw_text = raw_text.strip("`")
        if "\n" in raw_text:
            raw_text = raw_text.split("\n", 1)[1]
        raw_text = raw_text.rsplit("```", 1)[0].strip()

    try:
        return json.loads(raw_text)
    except json.JSONDecodeError:
        pass

    start = raw_text.find("{")
    end = raw_text.rfind("}")
    if start >= 0 and end > start:
        candidate = raw_text[start : end + 1]
        try:
            return json.loads(candidate)
        except json.JSONDecodeError:
            return None
    return None


@api_view(["POST"])
def fix_analysis_json(request):
    component_name = str(request.data.get("componentName", "")).strip()
    component_data = request.data.get("componentData")
    full_analysis = request.data.get("fullAnalysis", {})
    attempt = int(request.data.get("attempt", 1))

    if not component_name:
        return Response(
            {"detail": "Request body must include 'componentName'."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    # Fast local path: if the malformed value is just a JSON string, parse it directly.
    if isinstance(component_data, str):
        local_candidate = _extract_json_payload(component_data)
        if local_candidate is not None:
            return Response(
                {
                    "status": "ok",
                    "componentName": component_name,
                    "componentData": local_candidate,
                    "resolved": True,
                    "source": "local-parser",
                }
            )

    prompt = (
        "You are a strict JSON repair engine.\n"
        "TASK: Repair the target component so it becomes valid JSON for dashboard rendering.\n\n"
        "OUTPUT RULES (MANDATORY):\n"
        "1) Return exactly one JSON object and nothing else.\n"
        "2) No markdown, no code fences, no explanation.\n"
        "3) Use this exact envelope: {\"componentData\": <object-or-array-or-null>}.\n"
        "4) If you cannot repair safely, return {\"componentData\": null}.\n"
        "5) Preserve semantic meaning and field names whenever possible.\n"
        "6) Ensure result parses with strict JSON parser.\n\n"
        f"Target component: {component_name}\n"
        f"Attempt number: {attempt}\n"
        f"Malformed component input:\n{json.dumps(component_data, ensure_ascii=True)}\n\n"
        f"Full analysis context:\n{json.dumps(full_analysis, ensure_ascii=True)[:18000]}"
    )

    try:
        llm_result = run_chat_completion(prompt)
        parsed = _extract_json_payload(llm_result.get("content", ""))
    except Exception as exc:
        return Response(
            {"detail": "JSON fixture failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    fixed = parsed.get("componentData") if isinstance(parsed, dict) else None
    return Response(
        {
            "status": "ok",
            "componentName": component_name,
            "componentData": fixed,
            "resolved": fixed is not None,
            "source": "llm-fixture",
        }
    )


@api_view(["POST"])
def agent_tool_chat(request, tool_slug: str):
    message = str(request.data.get("message", "")).strip()
    if not message:
        return Response(
            {"detail": "Request body must include a non-empty 'message' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    history = request.data.get("history", [])
    artifact = request.data.get("artifact", {})
    data_context = request.data.get("data_context", None)

    try:
        payload = run_agent_tool_chat(
            tool_slug=tool_slug,
            message=message,
            history=history,
            current_artifact=artifact,
            data_context=data_context,
        )
    except ValueError as exc:
        return Response({"detail": str(exc)}, status=status.HTTP_400_BAD_REQUEST)
    except Exception as exc:
        return Response(
            {"detail": "Agent tool request failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    return Response({"status": "ok", **payload})


@api_view(["POST"])
def agent_chat(request):
    """Conversational agent with real-time tool calling (Claude Agent SDK)."""
    message = str(request.data.get("message", "")).strip()
    if not message:
        return Response(
            {"detail": "Request body must include a non-empty 'message' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    history = request.data.get("history", [])
    data_context = request.data.get("data_context", None)

    try:
        payload = run_agent_chat(
            message=message,
            history=history if isinstance(history, list) else [],
            data_context=data_context if isinstance(data_context, dict) else None,
        )
    except ValueError as exc:
        return Response({"detail": str(exc)}, status=status.HTTP_400_BAD_REQUEST)
    except Exception as exc:
        return Response(
            {"detail": "Agent chat failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    return Response({"status": "ok", **payload})


@api_view(["POST"])
def export_slides_pptx(request):
    """Accept a slides artifact JSON and return a downloadable .pptx file."""
    artifact = request.data.get("artifact")
    if not isinstance(artifact, dict) or not artifact.get("slides"):
        return Response(
            {"detail": "Request body must include an 'artifact' object with a 'slides' array."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    try:
        pptx_bytes = generate_pptx(artifact)
    except Exception as exc:
        return Response(
            {"detail": "PPTX generation failed.", "error": str(exc)},
            status=status.HTTP_500_INTERNAL_SERVER_ERROR,
        )

    title_slug = (artifact.get("title") or "deck").replace(" ", "_")[:40]
    filename = f"{title_slug}.pptx"

    response = HttpResponse(
        pptx_bytes,
        content_type="application/vnd.openxmlformats-officedocument.presentationml.presentation",
    )
    response["Content-Disposition"] = f'attachment; filename="{filename}"'
    return response


@api_view(["POST"])
def export_report_docx(request):
    """Accept a report artifact JSON and return a downloadable .docx file."""
    artifact = request.data.get("artifact")
    if not isinstance(artifact, dict) or not artifact.get("sections"):
        return Response(
            {"detail": "Request body must include an 'artifact' object with a 'sections' array."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    try:
        docx_bytes = generate_docx(artifact)
    except Exception as exc:
        return Response(
            {"detail": "DOCX generation failed.", "error": str(exc)},
            status=status.HTTP_500_INTERNAL_SERVER_ERROR,
        )

    title_slug = (artifact.get("title") or "report").replace(" ", "_")[:40]
    filename = f"{title_slug}.docx"

    response = HttpResponse(
        docx_bytes,
        content_type="application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    )
    response["Content-Disposition"] = f'attachment; filename="{filename}"'
    return response


@api_view(["POST"])
def export_excel_xlsx(request):
    """Accept an Excel artifact JSON and return a downloadable .xlsx file."""
    artifact = request.data.get("artifact")
    if not isinstance(artifact, dict) or not artifact.get("sheets"):
        return Response(
            {"detail": "Request body must include an 'artifact' object with a 'sheets' array."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    try:
        xlsx_bytes = generate_xlsx(artifact)
    except Exception as exc:
        return Response(
            {"detail": "XLSX generation failed.", "error": str(exc)},
            status=status.HTTP_500_INTERNAL_SERVER_ERROR,
        )

    title_slug = (artifact.get("title") or "model").replace(" ", "_")[:40]
    filename = f"{title_slug}.xlsx"

    response = HttpResponse(
        xlsx_bytes,
        content_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    )
    response["Content-Disposition"] = f'attachment; filename="{filename}"'
    return response


@api_view(["POST"])
def multi_agent_run(request):
    """Run the multi-agent financial analysis pipeline with SSE streaming."""
    user_prompt = str(request.data.get("prompt", "")).strip()
    if not user_prompt:
        return Response(
            {"detail": "Request body must include a non-empty 'prompt' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    data_context = request.data.get("data_context", None)

    try:
        from .multi_agent_service import run_multi_agent_pipeline

        stream = run_multi_agent_pipeline(user_prompt, data_context)
    except Exception as exc:
        return Response(
            {"detail": "Multi-agent pipeline failed to start.", "error": str(exc)},
            status=status.HTTP_500_INTERNAL_SERVER_ERROR,
        )

    response = StreamingHttpResponse(stream, content_type="text/event-stream")
    response["Cache-Control"] = "no-cache"
    response["X-Accel-Buffering"] = "no"
    return response


_TV_NEWS_URL = "https://news-mediator.tradingview.com/public/news-flow/v2/news"
_TV_HEADERS = {
    "accept": "*/*",
    "origin": "https://in.tradingview.com",
    "referer": "https://in.tradingview.com/",
    "user-agent": (
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
        "AppleWebKit/537.36 (KHTML, like Gecko) "
        "Chrome/145.0.0.0 Safari/537.36"
    ),
}
_COMMON_EXCHANGES = ["NYSE", "NASDAQ", "AMEX"]


@api_view(["GET"])
def stock_news(request):
    """Proxy TradingView news for a given symbol or ticker."""
    symbol = request.query_params.get("symbol", "").strip()
    if not symbol:
        return Response(
            {"detail": "Query parameter 'symbol' is required (e.g. NYSE:DELL or DELL)."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    if ":" in symbol:
        symbol_filters = [f"symbol:{symbol}"]
    else:
        symbol_filters = [f"symbol:{ex}:{symbol}" for ex in _COMMON_EXCHANGES]

    all_items = []
    seen_ids = set()

    for sym_filter in symbol_filters:
        params = {
            "filter": ["lang:en", sym_filter],
            "client": "landing",
            "streaming": "false",
            "user_prostatus": "non_pro",
        }
        try:
            resp = http_requests.get(
                _TV_NEWS_URL, params=params, headers=_TV_HEADERS, timeout=10,
            )
            resp.raise_for_status()
            items = resp.json().get("items", [])
            for item in items:
                if item["id"] not in seen_ids:
                    seen_ids.add(item["id"])
                    all_items.append(item)
        except http_requests.RequestException:
            continue

    all_items.sort(key=lambda x: x.get("published", 0), reverse=True)

    return Response({"status": "ok", "items": all_items})


@api_view(["GET"])
def breaking_news(request):
    """Proxy TradingView top-story / market-index breaking news."""
    params = {
        'filter': [
            'lang:en_IN',
            'priority:important',
        ],
        'client': 'screener',
        'streaming': 'true',
        'user_prostatus': 'non_pro',
    }
    try:
        resp = http_requests.get(
            _TV_NEWS_URL, params=params, headers=_TV_HEADERS, timeout=10,
        )
        resp.raise_for_status()
        items = resp.json().get("items", [])
    except http_requests.RequestException as exc:
        return Response(
            {"detail": "Failed to fetch breaking news.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    return Response({"status": "ok", "items": items})


_TV_SCREENER_URL = "https://screener-facade.tradingview.com/screener-facade/api/v1/screener-table/scan"
_TV_SCREENER_HEADERS = {
    "accept": "application/json",
    "content-type": "text/plain;charset=UTF-8",
    "origin": "https://in.tradingview.com",
    "referer": "https://in.tradingview.com/",
    "user-agent": (
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
        "AppleWebKit/537.36 (KHTML, like Gecko) "
        "Chrome/145.0.0.0 Safari/537.36"
    ),
}


@api_view(["POST"])
def portfolio_risk_analysis(request):
    """Run portfolio risk analysis with real computations (correlation, VaR, optimal weights, stress tests)."""
    portfolio = request.data.get("portfolio", [])
    weights = request.data.get("weights", {})
    portfolio_value = float(request.data.get("portfolioValue", 100_000))

    if not portfolio or not isinstance(portfolio, list):
        return Response(
            {"detail": "Request body must include a non-empty 'portfolio' array of ticker symbols."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    portfolio = [str(t).strip().upper() for t in portfolio if t]
    if not portfolio:
        return Response(
            {"detail": "Portfolio must contain at least one valid ticker."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    if not isinstance(weights, dict):
        weights = {}

    try:
        result = run_portfolio_risk_analysis(
            portfolio=portfolio,
            weights=weights,
            portfolio_value=portfolio_value,
        )
    except Exception as exc:
        return Response(
            {"detail": "Risk analysis failed.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    if "error" in result:
        return Response(
            {"detail": result["error"]},
            status=status.HTTP_400_BAD_REQUEST,
        )

    return Response({"status": "ok", **result})


@api_view(["GET"])
def market_benchmarks(request):
    """Fetch US index technicals from TradingView screener."""
    params = {
        "table_id": "indices_quotes.us",
        "version": "52",
        "columnset_id": "technicals",
    }
    body = '{"lang":"en","range":[0,5],"scanner_product_label":"markets-screener"}'

    try:
        resp = http_requests.post(
            _TV_SCREENER_URL,
            params=params,
            headers=_TV_SCREENER_HEADERS,
            data=body,
            timeout=10,
        )
        resp.raise_for_status()
        raw = resp.json()
    except http_requests.RequestException as exc:
        return Response(
            {"detail": "Failed to fetch market benchmarks.", "error": str(exc)},
            status=status.HTTP_502_BAD_GATEWAY,
        )

    symbols = raw.get("symbols", [])
    columns = raw.get("data", [])
    count = len(symbols)

    col_map = {}
    for col in columns:
        cid = col["id"]
        if cid in col_map:
            col_map[cid + "_2"] = col
        else:
            col_map[cid] = col

    benchmarks = []
    for i in range(count):
        ticker_col = col_map.get("TickerUniversal", {})
        raw_vals = ticker_col.get("rawValues", [])
        info = raw_vals[i] if i < len(raw_vals) else {}

        tech_rating = col_map.get("TechnicalRating", {}).get("rawValues", [])
        ma_rating = col_map.get("RatingMa", {}).get("rawValues", [])
        osc_rating = col_map.get("RatingOscillators", {}).get("rawValues", [])
        rsi_vals = col_map.get("RelativeStrengthIndex", {}).get("rawValues", [])

        benchmarks.append({
            "symbol": symbols[i] if i < len(symbols) else "",
            "name": info.get("description", ""),
            "exchange": info.get("exchange", ""),
            "ticker": info.get("name", ""),
            "logoid": info.get("logoid", ""),
            "technicalRating": tech_rating[i] if i < len(tech_rating) else None,
            "maRating": ma_rating[i] if i < len(ma_rating) else None,
            "oscillatorsRating": osc_rating[i] if i < len(osc_rating) else None,
            "rsi": round(rsi_vals[i], 2) if i < len(rsi_vals) and isinstance(rsi_vals[i], (int, float)) else None,
        })

    return Response({"status": "ok", "benchmarks": benchmarks})


@api_view(["GET"])
def quant_models_list(_request):
    """List available quantitative/AutoML models."""
    models = [
        {"id": k, "name": k.replace("_", " ").title(), "description": _MODEL_DESCRIPTIONS.get(k, "")}
        for k in ALL_MODELS.keys()
    ]
    return Response({"models": models})


@api_view(["POST"])
def quant_model_run(request):
    """Run a quantitative model on a ticker. Returns metrics, chart_data, signals, interpretation."""
    ticker = str(request.data.get("ticker", "")).strip().upper()
    if not ticker:
        return Response(
            {"detail": "Request body must include a non-empty 'ticker' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    model_name = str(request.data.get("model", "")).strip().lower().replace(" ", "_")
    if not model_name or model_name not in ALL_MODELS:
        return Response(
            {"detail": f"Unknown model. Available: {', '.join(ALL_MODELS.keys())}"},
            status=status.HTTP_400_BAD_REQUEST,
        )

    period = str(request.data.get("period", "1y")).strip() or "1y"
    horizon = str(request.data.get("horizon", "1-Week")).strip()
    scenario = str(request.data.get("scenario", "Base Case")).strip()

    scenario_adjust = _scenario_adjustments(scenario)

    kwargs = {}
    if model_name == "monte_carlo":
        kwargs["period"] = period
        days_map = {"1-Day": 1, "1-Week": 7, "1-Month": 30}
        kwargs["days"] = days_map.get(horizon, 30)
        kwargs["drift_adjustment"] = scenario_adjust["growth"] / 252
    elif model_name == "dcf":
        base_growth = float(request.data.get("growth_rate", 8)) / 100
        base_discount = float(request.data.get("discount_rate", 10)) / 100
        base_terminal = float(request.data.get("terminal_growth", 3)) / 100
        kwargs["growth_rate"] = base_growth + scenario_adjust["growth"]
        kwargs["discount_rate"] = base_discount + scenario_adjust["discount"]
        kwargs["terminal_growth"] = base_terminal + scenario_adjust["terminal_growth"]
    elif model_name == "correlation":
        extra_tickers = request.data.get("tickers")
        if isinstance(extra_tickers, str):
            extra_tickers = [t.strip().upper() for t in extra_tickers.split(",") if t.strip()]
        elif not isinstance(extra_tickers, list):
            extra_tickers = []
        second_ticker = "QQQ" if ticker.upper() == "SPY" else "SPY"
        tickers_list = list(dict.fromkeys([ticker] + [t for t in extra_tickers if t and str(t).strip().upper() != ticker]))[:8]
        if len(tickers_list) < 2:
            tickers_list = list(dict.fromkeys([ticker, second_ticker]))
        kwargs["tickers"] = tickers_list
        kwargs["period"] = period
    elif model_name == "regression":
        kwargs["period"] = period
        kwargs["forecast_days"] = {"1-Day": 1, "1-Week": 7, "1-Month": 30}.get(horizon, 30)
    else:
        kwargs["period"] = period

    try:
        result = run_financial_model(model_name, ticker, **kwargs)
    except Exception as exc:
        return Response(
            {"detail": str(exc), "model": model_name, "ticker": ticker},
            status=status.HTTP_500_INTERNAL_SERVER_ERROR,
        )

    if "error" in result:
        return Response(
            {"detail": result["error"], "model": model_name, "ticker": ticker},
            status=status.HTTP_422_UNPROCESSABLE_ENTITY,
        )

    return Response(result)


@api_view(["POST"])
def quant_models_run_all(request):
    """Run all quantitative models on a ticker and generate an LLM executive summary."""
    ticker = str(request.data.get("ticker", "")).strip().upper()
    if not ticker:
        return Response(
            {"detail": "Request body must include a non-empty 'ticker' field."},
            status=status.HTTP_400_BAD_REQUEST,
        )

    period = str(request.data.get("period", "1y")).strip() or "1y"
    horizon = str(request.data.get("horizon", "1-Week")).strip()
    scenario = str(request.data.get("scenario", "Base Case")).strip()
    scenario_adjust = _scenario_adjustments(scenario)

    growth = float(request.data.get("growth_rate", 8)) / 100
    discount = float(request.data.get("discount_rate", 10)) / 100
    terminal_growth = float(request.data.get("terminal_growth", 3)) / 100
    days_map = {"1-Day": 1, "1-Week": 7, "1-Month": 30}
    days = days_map.get(horizon, 30)
    forecast_days = days

    results = {}
    interpretations = []
    signals_list = []

    for model_name in ALL_MODELS:
        kwargs = {"period": period}
        if model_name == "monte_carlo":
            kwargs["days"] = days
            kwargs["drift_adjustment"] = scenario_adjust["growth"] / 252
        elif model_name == "dcf":
            kwargs["growth_rate"] = growth + scenario_adjust["growth"]
            kwargs["discount_rate"] = discount + scenario_adjust["discount"]
            kwargs["terminal_growth"] = terminal_growth + scenario_adjust["terminal_growth"]
        elif model_name == "correlation":
            second_ticker = "QQQ" if ticker == "SPY" else "SPY"
            kwargs["tickers"] = [ticker, second_ticker]
        elif model_name == "regression":
            kwargs["forecast_days"] = forecast_days

        try:
            result = run_financial_model(model_name, ticker, **kwargs)
            if "error" not in result:
                results[model_name] = result
                if result.get("interpretation"):
                    interpretations.append(f"[{model_name}]: {result['interpretation']}")
                for sig in result.get("signals", []):
                    signals_list.append(f"[{model_name}] {sig}")
        except Exception:
            results[model_name] = {"error": "Model failed", "model": model_name}

    summary_prompt = (
        f"You are a concise financial analyst. Write a 3-5 sentence executive summary for {ticker}.\n\n"
        f"Scenario: {scenario}\n"
        f"Models run: {', '.join(results.keys())}\n\n"
        f"Key signals:\n" + "\n".join(signals_list[:15]) + "\n\n"
        f"Model interpretations:\n" + "\n".join(interpretations[:10]) + "\n\n"
        "Synthesize the findings into a clear, actionable executive summary for stakeholders."
    )

    try:
        llm_result = run_chat_completion(summary_prompt)
        executive_summary = (llm_result.get("content") or "").strip()
    except Exception:
        executive_summary = (
            f"Analysis completed for {ticker}. "
            f"Ran {len([r for r in results.values() if 'error' not in r])} models. "
            "Review individual model outputs for details."
        )

    return Response({
        "ticker": ticker,
        "results": results,
        "executive_summary": executive_summary,
        "models_run": list(results.keys()),
    })


def _scenario_adjustments(scenario: str) -> dict:
    """Return growth/discount/terminal_growth adjustments based on scenario."""
    s = (scenario or "").lower()
    if "bull" in s or "soft landing" in s:
        return {"growth": 0.005, "discount": -0.005, "terminal_growth": 0.005}
    if "bear" in s or "recession" in s:
        return {"growth": -0.005, "discount": 0.005, "terminal_growth": -0.005}
    return {"growth": 0.0, "discount": 0.0, "terminal_growth": 0.0}


_MODEL_DESCRIPTIONS = {
    "moving_averages": "SMA/EMA crossovers and trend signals",
    "rsi": "Relative Strength Index overbought/oversold",
    "macd": "MACD momentum and crossover signals",
    "bollinger_bands": "Volatility bands and squeeze detection",
    "monte_carlo": "Probabilistic price forecast",
    "dcf": "Discounted cash flow valuation",
    "beta_capm": "Beta vs benchmark and CAPM expected return",
    "risk_metrics": "Sharpe, Sortino, drawdown, VaR",
    "correlation": "Pairwise correlation matrix (multi-ticker)",
    "regression": "Linear trend and forecast",
}