# polisplexity/pxy_agents_coral/views.py
from __future__ import annotations

import json
import re
from typing import Any, Dict, Tuple

import requests
from django.conf import settings
from django.http import JsonResponse, HttpRequest
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods, require_POST

# ----- contracts version (best-effort) -----
try:
    from pxy_contracts.version import SPEC_VERSION
except Exception:
    SPEC_VERSION = "0.1.0"

# ----- INTERNAL CALL BASES -----
# For the generic /api/agents/execute proxy (kept for compatibility)
AGENTS_INTERNAL_BASE = getattr(settings, "AGENTS_INTERNAL_BASE", "")

# For the formatter endpoints we *force* an internal base and never guess from Host.
# Set in .env: AGENTS_INTERNAL_BASE=http://127.0.0.1:8002
# Fallback keeps you safe even if env is missing/misread.
FORMAT_INTERNAL_BASE = AGENTS_INTERNAL_BASE or "http://127.0.0.1:8002"

# ===== helpers =====
def _load_body(request: HttpRequest) -> Dict[str, Any]:
    try:
        raw = (request.body or b"").decode("utf-8")
        return json.loads(raw or "{}")
    except Exception:
        return {}

def _extract_payload(body: Dict[str, Any]) -> Tuple[Dict[str, Any], str]:
    """
    Returns (payload, src) where src is 'payload', 'args_raw', or 'empty'.
    Accepts:
      1) {"payload": {...}}
      2) Canonical tg envelope with .input.args_raw like "/sami {...}"
    """
    if isinstance(body.get("payload"), dict):
        return body["payload"], "payload"
    args_raw = (body.get("input", {}) or {}).get("args_raw") or ""
    cleaned = re.sub(r"^/\w+\s*", "", args_raw).strip()
    if cleaned:
        try:
            return json.loads(cleaned), "args_raw"
        except Exception:
            pass
    return {}, "empty"

def _post_underlying(agent: str, payload: Dict[str, Any], timeout: float = 60.0):
    """
    Call the *real* internal APIs via a fixed base (no build_absolute_uri):
      sami  -> /api/sami/run
      sites -> /api/sites/search
    """
    path = "/api/sami/run" if agent == "sami" else "/api/sites/search"
    url = f"{FORMAT_INTERNAL_BASE.rstrip('/')}{path}"
    try:
        r = requests.post(url, json=payload, timeout=timeout)
        try:
            data = r.json()
        except Exception:
            data = {"code": "NON_JSON", "message": r.text[:2000]}
        return r.status_code, data
    except requests.Timeout:
        return 504, {"code": "UPSTREAM_TIMEOUT", "message": "agent upstream timed out", "_debug_url": url}
    except Exception as e:
        return 500, {"code": "EXEC_ERROR", "message": str(e), "_debug_url": url}

# Tiny text builders for bot replies
def _text_sami(data: Dict[str, Any]) -> str:
    if "beta" in data and "r2" in data:
        lines = [f"SAMI run: β={data['beta']:.3f}, R²={data['r2']:.3f}"]
        for c in sorted(data.get("residuals", []), key=lambda x: x.get("rank", 1e9))[:3]:
            lines.append(f"{c.get('rank')}. {c.get('city')}: {c.get('sami',0):+0.2f}")
        if data.get("share_url"):
            lines += ["", data["share_url"]]
        return "\n".join(lines)
    if data.get("code"):
        return f"⚠️ {data.get('code')}: {data.get('message','')}"
    return "SAMI results ready."

def _text_sites(data: Dict[str, Any]) -> str:
    if isinstance(data.get("candidates"), list):
        city = data.get("city", "?"); biz = data.get("business", "?")
        lines = [f"Top sites for {biz} in {city}:"]
        for i, c in enumerate(data["candidates"][:3], 1):
            lines.append(f"{i}. score={c.get('score',0):.2f} @ ({c.get('lat',0):.5f},{c.get('lon',0):.5f})")
        for k in ("share_url", "isochrones_geojson_url", "candidates_geojson_url"):
            if data.get(k): lines.append(data[k])
        return "\n".join(lines)
    if data.get("code"):
        return f"⚠️ {data.get('code')}: {data.get('message','')}"
    return "Site scoring ready."

# ===== public endpoints =====
@csrf_exempt
@require_http_methods(["GET", "POST"])
def agents_list(request: HttpRequest):
    # use request host only for *outward* links (safe)
    base = request.build_absolute_uri("/")[:-1]
    agents = [
        {
            "agent": "sami",
            "name": "SAMI-Agent",
            "version": "1.0.0",
            "spec_version": SPEC_VERSION,
            "contracts_url": f"{base}/api/contracts/sami.json",
            "execute_url": f"{base}/api/agents/execute",
            "description": "Urban scaling (β, R²) + SAMI residuals + chart",
        },
        {
            "agent": "sites",
            "name": "Sites-Agent",
            "version": "1.0.0",
            "spec_version": SPEC_VERSION,
            "contracts_url": f"{base}/api/contracts/sites.json",
            "execute_url": f"{base}/api/agents/execute",
            "description": "Site scoring (access, demand, competition) with maps",
        },
    ]
    lines = ["Available agents:"]
    for a in agents:
        lines.append(f"- {a['agent']}: {a['description']}")
    lines += [
        "",
        "Try:",
        '/sami {"indicator":"imss_wages_2023","cities":["CDMX","GDL","MTY"]}',
        '/sites {"city":"CDMX","business":"cafe","time_bands":[10,20]}',
    ]
    return JsonResponse({"agents": agents, "text": "\n".join(lines)})

@csrf_exempt
@require_POST
def agents_execute(request: HttpRequest):
    """
    Body: { "agent": "sami"|"sites", "payload": {...} }
    Proxies to the *internal* API using AGENTS_INTERNAL_BASE (or same-host fallback).
    """
    try:
        body = json.loads(request.body.decode("utf-8") or "{}")
        agent = (body.get("agent") or "").strip().lower()
        payload = body.get("payload")

        if agent not in {"sami", "sites"}:
            return JsonResponse({"code": "AGENT_NOT_FOUND", "message": f"unknown agent '{agent}'"}, status=404)
        if payload is None:
            return JsonResponse({"code": "BAD_REQUEST", "message": "missing 'payload'"}, status=400)

        path = "/api/sami/run" if agent == "sami" else "/api/sites/search"
        base = (AGENTS_INTERNAL_BASE or "http://127.0.0.1:8002").rstrip("/")
        url = f"{base}{path}"

        r = requests.post(url, json=payload, timeout=90)
        return JsonResponse(r.json(), status=r.status_code, safe=False)

    except requests.Timeout:
        return JsonResponse({"code": "UPSTREAM_TIMEOUT", "message": "agent upstream timed out"}, status=504)
    except ValueError as ve:
        return JsonResponse({"code": "BAD_JSON", "message": str(ve)}, status=400)
    except Exception as e:
        return JsonResponse({"code": "AGENT_EXEC_ERROR", "message": str(e)}, status=500)

# ----- formatters (call underlying APIs directly via fixed base) -----
@csrf_exempt
@require_http_methods(["GET", "POST"])
def format_sami(request: HttpRequest):
    body = _load_body(request)
    payload, src = _extract_payload(body)
    status, data = _post_underlying("sami", payload, timeout=60.0)
    data = data if isinstance(data, dict) else {"result": data}
    data.setdefault("_echo", {"src": src, "payload_keys": list(payload.keys())})
    try:
        data["text"] = _text_sami(data)
    except Exception:
        pass
    return JsonResponse(data, status=status, safe=False)

@csrf_exempt
@require_http_methods(["GET", "POST"])
def format_sites(request: HttpRequest):
    body = _load_body(request)
    payload, src = _extract_payload(body)
    status, data = _post_underlying("sites", payload, timeout=60.0)
    data = data if isinstance(data, dict) else {"result": data}
    data.setdefault("_echo", {"src": src, "payload_keys": list(payload.keys())})
    try:
        data["text"] = _text_sites(data)
    except Exception:
        pass
    return JsonResponse(data, status=status, safe=False)