import requests, json
from typing import Optional
from sqlalchemy.orm import Session
from app.models.api_asset import APIAsset, APIEndpoint
from app.models.metadata import DataColumn
from app.services.classification_engine import match_rule

# Simple sensitive keywords for API field detection
SENSITIVE_KEYWORDS = [
    "password", "pwd", "passwd", "secret", "token", "credit_card", "card_no",
    "bank_account", "bank_card", "id_card", "id_number", "phone", "mobile",
    "email", "address", "name", "age", "gender", "salary", "income",
    "health", "medical", "biometric", "fingerprint", "face",
]

def _is_sensitive_field(name: str, schema: dict) -> tuple[bool, str]:
    low = name.lower()
    for kw in SENSITIVE_KEYWORDS:
        if kw in low:
            return True, f"keyword:{kw}"
    # Check description / format hints
    desc = str(schema.get("description", "")).lower()
    fmt = str(schema.get("format", "")).lower()
    if "email" in fmt or "email" in desc:
        return True, "format:email"
    if "uuid" in fmt and "user" in low:
        return True, "format:user-uuid"
    return False, ""

def _extract_fields(schema: dict, prefix: str = "") -> list[dict]:
    fields = []
    if not isinstance(schema, dict):
        return fields
    props = schema.get("properties", {})
    for k, v in props.items():
        full_name = f"{prefix}.{k}" if prefix else k
        sensitive, reason = _is_sensitive_field(k, v)
        if sensitive:
            fields.append({"name": full_name, "type": v.get("type", "unknown"), "reason": reason})
        # nested object
        if v.get("type") == "object" and "properties" in v:
            fields.extend(_extract_fields(v, full_name))
        # array items
        if v.get("type") == "array" and isinstance(v.get("items"), dict):
            fields.extend(_extract_fields(v["items"], full_name + "[]"))
    return fields

def _risk_level_from_fields(fields: list[dict]) -> str:
    if not fields:
        return "low"
    high_keywords = {"password", "secret", "token", "credit_card", "bank_account", "biometric", "fingerprint", "face"}
    for f in fields:
        for kw in high_keywords:
            if kw in f["name"].lower():
                return "critical" if kw in {"password", "secret", "token", "biometric"} else "high"
    return "medium"

def scan_swagger(db: Session, asset_id: int) -> dict:
    asset = db.query(APIAsset).filter(APIAsset.id == asset_id).first()
    if not asset:
        return {"success": False, "error": "Asset not found"}
    if not asset.swagger_url:
        return {"success": False, "error": "No swagger_url configured"}

    asset.scan_status = "scanning"
    db.commit()
    try:
        headers = dict(asset.headers or {})
        resp = requests.get(asset.swagger_url, headers=headers, timeout=30)
        resp.raise_for_status()
        spec = resp.json()

        # Clear previous endpoints
        db.query(APIEndpoint).filter(APIEndpoint.asset_id == asset_id).delete()

        paths = spec.get("paths", {})
        total = 0
        sensitive_total = 0
        for path, methods in paths.items():
            for method, detail in methods.items():
                if method.lower() not in {"get","post","put","patch","delete","head","options"}:
                    continue
                total += 1
                parameters = []
                for p in detail.get("parameters", []):
                    parameters.append({"name": p.get("name"), "in": p.get("in"), "required": p.get("required", False), "type": p.get("schema",{}).get("type","string")})
                req_schema = detail.get("requestBody", {}).get("content", {}).get("application/json", {}).get("schema")
                resp_schema = None
                for code, resp_detail in (detail.get("responses", {}).get("200", {}).get("content", {}) or {}).items():
                    if isinstance(resp_detail, dict) and "schema" in resp_detail:
                        resp_schema = resp_detail["schema"]
                        break
                # Also try generic 200
                if resp_schema is None:
                    ok = detail.get("responses", {}).get("200", {})
                    for ct, cd in ok.get("content", {}).items():
                        if isinstance(cd, dict) and "schema" in cd:
                            resp_schema = cd["schema"]
                            break

                fields = []
                if req_schema:
                    fields.extend(_extract_fields(req_schema))
                if resp_schema:
                    fields.extend(_extract_fields(resp_schema))
                # dedup
                seen = set()
                unique_fields = []
                for f in fields:
                    if f["name"] not in seen:
                        seen.add(f["name"])
                        unique_fields.append(f)

                risk = _risk_level_from_fields(unique_fields)
                ep = APIEndpoint(
                    asset_id=asset_id,
                    method=method.upper(),
                    path=path,
                    summary=detail.get("summary", ""),
                    tags=detail.get("tags", []),
                    parameters=parameters,
                    request_body_schema=req_schema,
                    response_schema=resp_schema,
                    sensitive_fields=unique_fields,
                    risk_level=risk,
                )
                db.add(ep)
                if unique_fields:
                    sensitive_total += 1

        asset.scan_status = "completed"
        asset.total_endpoints = total
        asset.sensitive_endpoints = sensitive_total
        asset.updated_at = __import__('datetime').datetime.utcnow()
        db.commit()
        return {"success": True, "total": total, "sensitive": sensitive_total}
    except Exception as e:
        asset.scan_status = "failed"
        db.commit()
        return {"success": False, "error": str(e)}

def create_asset(db: Session, data: dict, user_id: Optional[int] = None) -> APIAsset:
    asset = APIAsset(
        name=data["name"],
        base_url=data["base_url"],
        swagger_url=data.get("swagger_url"),
        auth_type=data.get("auth_type", "none"),
        headers=data.get("headers"),
        description=data.get("description"),
        created_by=user_id,
    )
    db.add(asset)
    db.commit()
    db.refresh(asset)
    return asset

def update_asset(db: Session, asset_id: int, data: dict) -> Optional[APIAsset]:
    asset = db.query(APIAsset).filter(APIAsset.id == asset_id).first()
    if not asset:
        return None
    for k, v in data.items():
        if hasattr(asset, k):
            setattr(asset, k, v)
    db.commit()
    db.refresh(asset)
    return asset

def delete_asset(db: Session, asset_id: int) -> bool:
    asset = db.query(APIAsset).filter(APIAsset.id == asset_id).first()
    if not asset:
        return False
    db.delete(asset)
    db.commit()
    return True