"""APIClient - Agent — OpenAPI / Swagger spec parser.

Parses OpenAPI 3.x and Swagger 2.0 specs (JSON or YAML) directly,
without needing AI tokens.
"""
import json
import re


def _try_yaml(text: str) -> dict | None:
    try:
        import yaml
        return yaml.safe_load(text)
    except Exception:
        return None


def _try_json(text: str) -> dict | None:
    try:
        return json.loads(text)
    except Exception:
        return None


def detect_spec(text: str) -> dict | None:
    """Try to parse text as OpenAPI/Swagger JSON or YAML. Returns raw dict or None."""
    data = _try_json(text) or _try_yaml(text)
    if not isinstance(data, dict):
        return None
    if "openapi" in data or "swagger" in data:
        return data
    return None


def parse_spec(data: dict) -> dict:
    """
    Parse an OpenAPI 3.x or Swagger 2.0 spec dict into EKIKA's internal format:
    {
        "collection_name": str,
        "base_url": str,
        "auth_type": str,
        "endpoints": [...],
        "environment_variables": {...}
    }
    """
    version = str(data.get("openapi", data.get("swagger", "2")))
    is_v3   = version.startswith("3")

    # Collection name
    info = data.get("info", {})
    collection_name = info.get("title", "Imported API")

    # Base URL
    if is_v3:
        servers = data.get("servers", [])
        base_url = servers[0].get("url", "") if servers else ""
    else:
        host    = data.get("host", "")
        schemes = data.get("schemes", ["https"])
        base_p  = data.get("basePath", "/")
        base_url = f"{schemes[0]}://{host}{base_p}" if host else ""

    # Clean trailing slash
    base_url = base_url.rstrip("/")

    # Auth detection
    security_schemes = {}
    if is_v3:
        security_schemes = data.get("components", {}).get("securitySchemes", {})
    else:
        security_schemes = data.get("securityDefinitions", {})

    auth_type = "none"
    for scheme in security_schemes.values():
        t = scheme.get("type", "").lower()
        if t in ("http", "bearer") or scheme.get("scheme", "").lower() == "bearer":
            auth_type = "bearer"
            break
        if t == "apikey":
            auth_type = "apikey"
            break
        if t in ("basic", "http") and scheme.get("scheme", "").lower() == "basic":
            auth_type = "basic"
            break

    # Endpoints
    endpoints = []
    paths = data.get("paths", {})

    for path, path_item in paths.items():
        if not isinstance(path_item, dict):
            continue
        for method in ("get", "post", "put", "patch", "delete", "head", "options"):
            op = path_item.get(method)
            if not isinstance(op, dict):
                continue

            name = op.get("summary") or op.get("operationId") or f"{method.upper()} {path}"
            description = op.get("description", "")

            # Headers
            headers: dict = {}

            # Query params
            params: dict = {}
            body_example = ""
            content_type = "application/json"
            body_type = "raw"

            # Parameters
            for param in op.get("parameters", []):
                if not isinstance(param, dict):
                    continue
                p_in   = param.get("in", "")
                p_name = param.get("name", "")
                if p_in == "query":
                    params[p_name] = param.get("example", "")
                elif p_in == "header":
                    headers[p_name] = param.get("example", "")

            # Request body (OpenAPI 3)
            if is_v3 and "requestBody" in op:
                rb      = op["requestBody"]
                content = rb.get("content", {})
                if "application/json" in content:
                    schema  = content["application/json"].get("schema", {})
                    body_example = _schema_to_example_str(schema)
                    content_type = "application/json"
                elif "application/x-www-form-urlencoded" in content:
                    body_type = "form-urlencoded"
                    content_type = ""
                elif content:
                    first_ct = next(iter(content))
                    content_type = first_ct

            # Request body (Swagger 2)
            if not is_v3:
                consumes = op.get("consumes", data.get("consumes", ["application/json"]))
                for param in op.get("parameters", []):
                    if param.get("in") == "body":
                        schema = param.get("schema", {})
                        body_example = _schema_to_example_str(schema)
                        if consumes:
                            content_type = consumes[0]

            # Add auth header hint
            if auth_type == "bearer":
                headers.setdefault("Authorization", "Bearer {{token}}")
            elif auth_type == "apikey":
                headers.setdefault("X-API-Key", "{{api_key}}")

            # Basic test script
            test_script = (
                f"pm.test('Status OK', lambda: pm.response.to_have_status(200))\n"
                f"pm.test('Has body', lambda: expect(pm.response.text).to_be_truthy())"
            )

            endpoints.append({
                "name":         name,
                "method":       method.upper(),
                "path":         path,
                "description":  description,
                "headers":      headers,
                "params":       params,
                "body":         body_example,
                "body_type":    body_type,
                "content_type": content_type,
                "test_script":  test_script,
            })

    # Environment variables
    env_vars: dict = {}
    if base_url:
        env_vars["base_url"] = base_url
    if auth_type == "bearer":
        env_vars["token"] = ""
    elif auth_type == "apikey":
        env_vars["api_key"] = ""
    elif auth_type == "basic":
        env_vars["username"] = ""
        env_vars["password"] = ""

    return {
        "collection_name":       collection_name,
        "base_url":              base_url,
        "auth_type":             auth_type,
        "endpoints":             endpoints,
        "environment_variables": env_vars,
    }


def _schema_to_example_str(schema: dict) -> str:
    """Generate a compact JSON example string from an OpenAPI schema."""
    try:
        example = _schema_to_example(schema)
        return json.dumps(example, indent=2, ensure_ascii=False)
    except Exception:
        return ""


def _schema_to_example(schema: dict, depth: int = 0) -> object:
    if depth > 5:
        return {}
    if not isinstance(schema, dict):
        return {}

    # Use provided example first
    if "example" in schema:
        return schema["example"]
    if "default" in schema:
        return schema["default"]

    t = schema.get("type", "object")

    if t == "object" or "properties" in schema:
        result = {}
        for k, v in schema.get("properties", {}).items():
            result[k] = _schema_to_example(v, depth + 1)
        return result

    if t == "array":
        items = schema.get("items", {})
        return [_schema_to_example(items, depth + 1)]

    if t == "string":
        fmt = schema.get("format", "")
        if fmt == "date-time": return "2024-01-01T00:00:00Z"
        if fmt == "date":      return "2024-01-01"
        if fmt == "email":     return "user@example.com"
        if fmt == "uuid":      return "00000000-0000-0000-0000-000000000000"
        return schema.get("enum", ["string"])[0]

    if t == "integer": return 0
    if t == "number":  return 0.0
    if t == "boolean": return True
    return {}