import functools
import os
import re
import sys
from abc import ABC, abstractmethod
from dataclasses import asdict, dataclass, is_dataclass
from enum import Enum
from typing import Any, Dict, Optional, Set

from pydantic.v1 import BaseModel, ValidationError, validator

from prowler.config.config import Provider
from prowler.lib.check.compliance_models import Compliance
from prowler.lib.check.utils import recover_checks_from_provider
from prowler.lib.logger import logger


class Code(BaseModel):
    """
    Represents the remediation code using IaC like CloudFormation, Terraform or the native CLI.

    Attributes:
        NativeIaC (str): The NativeIaC code.
        Terraform (str): The Terraform code.
        CLI (str): The CLI code.
        Other (str): Other code.
    """

    NativeIaC: str
    Terraform: str
    CLI: str
    Other: str


class Recommendation(BaseModel):
    """
    Represents a recommendation.

    Attributes:
        Text (str): The text of the recommendation.
        Url (str): The URL associated with the recommendation.
    """

    Text: str
    Url: str


class Remediation(BaseModel):
    """
    Represents a remediation action for a specific .

    Attributes:
        Code (Code): The code associated with the remediation action.
        Recommendation (Recommendation): The recommendation for the remediation action.
    """

    Code: Code
    Recommendation: Recommendation


class Severity(str, Enum):
    critical = "critical"
    high = "high"
    medium = "medium"
    low = "low"
    informational = "informational"


class CheckMetadata(BaseModel):
    """
    Model representing the metadata of a check.

    Attributes:
        Provider (str): The provider of the check.
        CheckID (str): The ID of the check.
        CheckTitle (str): The title of the check.
        CheckType (list[str]): The type of the check.
        CheckAliases (list[str], optional): The aliases of the check. Defaults to an empty list.
        ServiceName (str): The name of the service.
        SubServiceName (str): The name of the sub-service.
        ResourceIdTemplate (str): The template for the resource ID.
        Severity (str): The severity of the check.
        ResourceType (str): The type of the resource.
        Description (str): The description of the check.
        Risk (str): The risk associated with the check.
        RelatedUrl (str): The URL related to the check.
        Remediation (Remediation): The remediation steps for the check.
        Categories (list[str]): The categories of the check.
        DependsOn (list[str]): The dependencies of the check.
        RelatedTo (list[str]): The related checks.
        Notes (str): Additional notes for the check.
        Compliance (list, optional): The compliance information for the check. Defaults to None.

    Validators:
        valid_category(value): Validator function to validate the categories of the check.
        severity_to_lower(severity): Validator function to convert the severity to lowercase.
        valid_severity(severity): Validator function to validate the severity of the check.
        valid_cli_command(remediation): Validator function to validate the CLI command is not an URL.
        valid_resource_type(resource_type): Validator function to validate the resource type is not empty.
    """

    Provider: str
    CheckID: str
    CheckTitle: str
    CheckType: list[str]
    CheckAliases: list[str] = []
    ServiceName: str
    SubServiceName: str
    ResourceIdTemplate: str
    Severity: Severity
    ResourceType: str
    Description: str
    Risk: str
    RelatedUrl: str
    Remediation: Remediation
    Categories: list[str]
    DependsOn: list[str]
    RelatedTo: list[str]
    Notes: str
    # We set the compliance to None to
    # store the compliance later if supplied
    Compliance: Optional[list[Any]] = []

    @validator("Categories", each_item=True, pre=True, always=True)
    def valid_category(value):
        if not isinstance(value, str):
            raise ValueError("Categories must be a list of strings")
        value_lower = value.lower()
        if not re.match("^[a-z0-9-]+$", value_lower):
            raise ValueError(
                f"Invalid category: {value}. Categories can only contain lowercase letters, numbers and hyphen '-'"
            )
        return value_lower

    @validator("Severity", pre=True, always=True)
    def severity_to_lower(severity):
        return severity.lower()

    @validator("Remediation")
    def valid_cli_command(remediation):
        if re.match(r"^https?://", remediation.Code.CLI):
            raise ValueError("CLI command cannot be an URL")
        return remediation

    @validator("ResourceType", pre=True, always=True)
    def valid_resource_type(resource_type):
        if not resource_type or not isinstance(resource_type, str):
            raise ValueError("ResourceType must be a non-empty string")
        return resource_type

    @validator("ServiceName", pre=True, always=True)
    def validate_service_name(cls, service_name, values):
        if not service_name:
            raise ValueError("ServiceName must be a non-empty string")

        check_id = values.get("CheckID")
        if check_id and values.get("Provider") != "iac":
            service_from_check_id = check_id.split("_")[0]
            if service_name != service_from_check_id:
                raise ValueError(
                    f"ServiceName {service_name} does not belong to CheckID {check_id}"
                )
            if not service_name.islower():
                raise ValueError(f"ServiceName {service_name} must be in lowercase")

        return service_name

    @validator("CheckID", pre=True, always=True)
    def valid_check_id(cls, check_id, values):
        if not check_id:
            raise ValueError("CheckID must be a non-empty string")

        if check_id and values.get("Provider") != "iac":
            if "-" in check_id:
                raise ValueError(
                    f"CheckID {check_id} contains a hyphen, which is not allowed"
                )

        return check_id

    @staticmethod
    def get_bulk(provider: str) -> dict[str, "CheckMetadata"]:
        """
        Load the metadata of all checks for a given provider reading the check's metadata files.
        Args:
            provider (str): The name of the provider.
        Returns:
            dict[str, CheckMetadata]: A dictionary containing the metadata of all checks, with the CheckID as the key.
        """

        bulk_check_metadata = {}
        checks = recover_checks_from_provider(provider)
        # Build list of check's metadata files
        for check_info in checks:
            # Build check path name
            check_name = check_info[0]
            check_path = check_info[1]
            # Ignore fixer files
            if check_name.endswith("_fixer"):
                continue
            # Append metadata file extension
            metadata_file = f"{check_path}/{check_name}.metadata.json"
            # Load metadata
            check_metadata = load_check_metadata(metadata_file)
            bulk_check_metadata[check_metadata.CheckID] = check_metadata

        return bulk_check_metadata

    @staticmethod
    def list(
        bulk_checks_metadata: dict = None,
        bulk_compliance_frameworks: dict = None,
        provider: str = None,
        severity: str = None,
        category: str = None,
        service: str = None,
        compliance_framework: str = None,
    ) -> Set["CheckMetadata"]:
        """
        Returns a set of checks from the bulk checks metadata.

        Args:
            provider (str): The provider of the checks.
            bulk_checks_metadata (dict): The bulk checks metadata.
            bulk_compliance_frameworks (dict): The bulk compliance frameworks.
            severity (str): The severity of the checks.
            category (str): The category of the checks.
            service (str): The service of the checks.
            compliance_framework (str): The compliance framework of the checks.

        Returns:
            set: A set of checks.
        """
        checks_from_provider = set()
        checks_from_severity = set()
        checks_from_category = set()
        checks_from_service = set()
        checks_from_compliance_framework = set()
        # If the bulk checks metadata is not provided, get it
        if not bulk_checks_metadata:
            bulk_checks_metadata = {}
            available_providers = [p.value for p in Provider]
            for provider_name in available_providers:
                bulk_checks_metadata.update(CheckMetadata.get_bulk(provider_name))
        if provider:
            checks_from_provider = {
                check_name
                for check_name, check_metadata in bulk_checks_metadata.items()
                if check_metadata.Provider == provider
            }
        if severity:
            checks_from_severity = CheckMetadata.list_by_severity(
                bulk_checks_metadata=bulk_checks_metadata, severity=severity
            )
        if category:
            checks_from_category = CheckMetadata.list_by_category(
                bulk_checks_metadata=bulk_checks_metadata, category=category
            )
        if service:
            checks_from_service = CheckMetadata.list_by_service(
                bulk_checks_metadata=bulk_checks_metadata, service=service
            )
        if compliance_framework:
            # Loaded here, as it is not always needed
            if not bulk_compliance_frameworks:
                bulk_compliance_frameworks = {}
                available_providers = [p.value for p in Provider]
                for provider in available_providers:
                    bulk_compliance_frameworks = Compliance.get_bulk(provider=provider)
            checks_from_compliance_framework = (
                CheckMetadata.list_by_compliance_framework(
                    bulk_compliance_frameworks=bulk_compliance_frameworks,
                    compliance_framework=compliance_framework,
                )
            )

        # Get all the checks:
        checks = set(bulk_checks_metadata.keys())
        # Get the intersection of the checks
        if len(checks_from_provider) > 0 or provider:
            checks = checks & checks_from_provider
        if len(checks_from_severity) > 0 or severity:
            checks = checks & checks_from_severity
        if len(checks_from_category) > 0 or category:
            checks = checks & checks_from_category
        if len(checks_from_service) > 0 or service:
            checks = checks & checks_from_service
        if len(checks_from_compliance_framework) > 0 or compliance_framework:
            checks = checks & checks_from_compliance_framework

        return checks

    @staticmethod
    def get(bulk_checks_metadata: dict, check_id: str) -> "CheckMetadata":
        """
        Returns the check metadata from the bulk checks metadata.

        Args:
            bulk_checks_metadata (dict): The bulk checks metadata.
            check_id (str): The check ID.

        Returns:
            CheckMetadata: The check metadata.
        """

        return bulk_checks_metadata.get(check_id, None)

    @staticmethod
    def list_by_severity(bulk_checks_metadata: dict, severity: str = None) -> set:
        """
        Returns a set of checks by severity from the bulk checks metadata.

        Args:
            bulk_checks_metadata (dict): The bulk checks metadata.
            severity (str): The severity.

        Returns:
            set: A set of checks by severity.
        """
        checks = set()

        if severity:
            checks = {
                check_name
                for check_name, check_metadata in bulk_checks_metadata.items()
                if check_metadata.Severity == severity
            }

        return checks

    @staticmethod
    def list_by_category(bulk_checks_metadata: dict, category: str = None) -> set:
        """
        Returns a set of checks by category from the bulk checks metadata.

        Args:
            bulk_checks_metadata (dict): The bulk checks metadata.
            category (str): The category.

        Returns:
            set: A set of checks by category.
        """
        checks = set()

        if category:
            checks = {
                check_name
                for check_name, check_metadata in bulk_checks_metadata.items()
                if category in check_metadata.Categories
            }

        return checks

    @staticmethod
    def list_by_service(bulk_checks_metadata: dict, service: str = None) -> set:
        """
        Returns a set of checks by service from the bulk checks metadata.

        Args:
            bulk_checks_metadata (dict): The bulk checks metadata.
            service (str): The service.

        Returns:
            set: A set of checks by service.
        """
        checks = set()

        if service:
            if service == "lambda":
                service = "awslambda"
            checks = {
                check_name
                for check_name, check_metadata in bulk_checks_metadata.items()
                if check_metadata.ServiceName == service
            }

        return checks

    @staticmethod
    def list_by_compliance_framework(
        bulk_compliance_frameworks: dict, compliance_framework: str = None
    ) -> set:
        """
        Returns a set of checks by compliance framework from the bulk compliance frameworks.

        Args:
            bulk_compliance_frameworks (dict): The bulk compliance frameworks.
            compliance_framework (str): The compliance framework.

        Returns:
            set: A set of checks by compliance framework.
        """
        checks = set()

        if compliance_framework:
            try:
                checks_from_framework_list = [
                    requirement.Checks
                    for requirement in bulk_compliance_frameworks[
                        compliance_framework
                    ].Requirements
                ]
                # Reduce nested list into a list
                # Pythonic functional magic
                checks_from_framework = functools.reduce(
                    lambda x, y: x + y, checks_from_framework_list
                )
                # Then union this list of checks with the initial one
                checks = checks.union(checks_from_framework)
            except Exception as e:
                logger.error(
                    f"{e.__class__.__name__}[{e.__traceback__.tb_lineno}] -- {e}"
                )

        return checks


class Check(ABC, CheckMetadata):
    """Prowler Check"""

    def __init__(self, **data):
        """Check's init function. Calls the CheckMetadataModel init."""
        # Parse the Check's metadata file
        metadata_file = (
            os.path.abspath(sys.modules[self.__module__].__file__)[:-3]
            + ".metadata.json"
        )
        # Store it to validate them with Pydantic
        data = CheckMetadata.parse_file(metadata_file).dict()
        # Calls parents init function
        super().__init__(**data)
        # TODO: verify that the CheckID is the same as the filename and classname
        # to mimic the test done at test_<provider>_checks_metadata_is_valid

    def metadata(self) -> dict:
        """Return the JSON representation of the check's metadata"""
        return self.json()

    @abstractmethod
    def execute(self) -> list:
        """Execute the check's logic"""


@dataclass
class Check_Report:
    """Contains the Check's finding information."""

    status: str
    status_extended: str
    check_metadata: CheckMetadata
    resource: dict
    resource_details: str
    resource_tags: list
    muted: bool

    def __init__(self, metadata: Dict, resource: Any) -> None:
        """Initialize the Check's finding information.

        Args:
            metadata: The metadata of the check.
            resource: Basic information about the resource. Defaults to None.
                      Only accepted dict, list, BaseModels (dict attribute), custom models (with to_dict attribute) and dataclasses.
        """
        self.status = ""
        self.check_metadata = CheckMetadata.parse_raw(metadata)
        if isinstance(resource, dict):
            self.resource = resource
        elif hasattr(resource, "dict"):
            self.resource = resource.dict()
        elif hasattr(resource, "to_dict"):
            self.resource = resource.to_dict()
        elif is_dataclass(resource):
            self.resource = asdict(resource)
        else:
            logger.error(
                f"Resource metadata {type(resource)} in {self.check_metadata.CheckID} could not be converted to dict"
            )
            self.resource = {}
        self.status_extended = ""
        self.resource_details = ""
        self.resource_tags = getattr(resource, "tags", []) if resource else []
        self.muted = False


@dataclass
class Check_Report_AWS(Check_Report):
    """Contains the AWS Check's finding information."""

    resource_id: str
    resource_arn: str
    region: str

    def __init__(self, metadata: Dict, resource: Any) -> None:
        super().__init__(metadata, resource)
        self.resource_id = (
            getattr(resource, "id", None) or getattr(resource, "name", None) or ""
        )
        self.resource_arn = getattr(resource, "arn", "")
        self.region = getattr(resource, "region", "")


@dataclass
class Check_Report_Azure(Check_Report):
    """Contains the Azure Check's finding information."""

    resource_name: str
    resource_id: str
    subscription: str
    location: str

    def __init__(self, metadata: Dict, resource: Any) -> None:
        """Initialize the Azure Check's finding information.

        Args:
            metadata: The metadata of the check.
            resource: Basic information about the resource. Defaults to None.
        """
        super().__init__(metadata, resource)
        self.resource_name = getattr(
            resource, "name", getattr(resource, "resource_name", "")
        )
        self.resource_id = getattr(resource, "id", getattr(resource, "resource_id", ""))
        self.subscription = ""
        self.location = getattr(resource, "location", "global")


@dataclass
class Check_Report_GCP(Check_Report):
    """Contains the GCP Check's finding information."""

    resource_name: str
    resource_id: str
    project_id: str
    location: str

    def __init__(
        self,
        metadata: Dict,
        resource: Any,
        location=None,
        resource_name=None,
        resource_id=None,
        project_id=None,
    ) -> None:
        super().__init__(metadata, resource)
        self.resource_id = (
            resource_id
            or getattr(resource, "id", None)
            or getattr(resource, "name", None)
            or ""
        )
        self.resource_name = (
            resource_name or getattr(resource, "name", "") or "GCP Project"
        )
        self.project_id = project_id or getattr(resource, "project_id", "")
        self.location = (
            location
            or getattr(resource, "location", "")
            or getattr(resource, "region", "")
        )


@dataclass
class Check_Report_Kubernetes(Check_Report):
    # TODO change class name to CheckReportKubernetes
    """Contains the Kubernetes Check's finding information."""

    resource_name: str
    resource_id: str
    namespace: str

    def __init__(self, metadata: Dict, resource: Any) -> None:
        super().__init__(metadata, resource)
        self.resource_id = (
            getattr(resource, "uid", None) or getattr(resource, "name", None) or ""
        )
        self.resource_name = getattr(resource, "name", "")
        self.namespace = getattr(resource, "namespace", "cluster-wide")
        if not self.namespace:
            self.namespace = "cluster-wide"


@dataclass
class CheckReportGithub(Check_Report):
    """Contains the GitHub Check's finding information."""

    resource_name: str
    resource_id: str
    owner: str

    def __init__(
        self,
        metadata: Dict,
        resource: Any,
        resource_name: str = None,
        resource_id: str = None,
        owner: str = None,
    ) -> None:
        """Initialize the GitHub Check's finding information.

        Args:
            metadata: The metadata of the check.
            resource: Basic information about the resource. Defaults to None.
            resource_name: The name of the resource related with the finding.
            resource_id: The id of the resource related with the finding.
            owner: The owner of the resource related with the finding.
        """
        super().__init__(metadata, resource)
        self.resource_name = resource_name or getattr(resource, "name", "")
        self.resource_id = resource_id or getattr(resource, "id", "")
        self.owner = (
            owner
            or getattr(resource, "owner", "")  # For Repositories
            or getattr(resource, "name", "")  # For Organizations
        )


@dataclass
class CheckReportM365(Check_Report):
    """Contains the M365 Check's finding information."""

    resource_name: str
    resource_id: str
    location: str

    def __init__(
        self,
        metadata: Dict,
        resource: Any,
        resource_name: str,
        resource_id: str,
        resource_location: str = "global",
    ) -> None:
        """Initialize the M365 Check's finding information.

        Args:
            metadata: The metadata of the check.
            resource: Basic information about the resource. Defaults to None.
            resource_name: The name of the resource related with the finding.
            resource_id: The id of the resource related with the finding.
            resource_location: The location of the resource related with the finding.
        """
        super().__init__(metadata, resource)
        self.resource_name = resource_name
        self.resource_id = resource_id
        self.location = resource_location


@dataclass
class CheckReportIAC(Check_Report):
    """Contains the IAC Check's finding information using Trivy."""

    resource_name: str
    resource_line_range: str

    def __init__(
        self, metadata: dict = {}, finding: dict = {}, file_path: str = ""
    ) -> None:
        """
        Initialize the IAC Check's finding information from a Trivy misconfiguration dict.

        Args:
            metadata (Dict): Optional check metadata (can be None).
            finding (dict): A single misconfiguration result from Trivy's JSON output.
        """
        super().__init__(metadata, finding)

        self.resource = finding
        self.resource_name = file_path
        self.resource_line_range = (
            (
                str(finding.get("CauseMetadata", {}).get("StartLine", ""))
                + ":"
                + str(finding.get("CauseMetadata", {}).get("EndLine", ""))
            )
            if finding.get("CauseMetadata", {}).get("StartLine", "")
            else ""
        )


@dataclass
class CheckReportNHN(Check_Report):
    """Contains the NHN Check's finding information."""

    resource_name: str
    resource_id: str
    location: str

    def __init__(self, metadata: Dict, resource: Any) -> None:
        """Initialize the NHN Check's finding information.

        Args:
            metadata: The metadata of the check.
            resource: Basic information about the resource. Defaults to None.
        """
        super().__init__(metadata, resource)
        self.resource_name = getattr(
            resource, "name", getattr(resource, "resource_name", "")
        )
        self.resource_id = getattr(resource, "id", getattr(resource, "resource_id", ""))
        self.location = getattr(resource, "location", "kr1")


# Testing Pending
def load_check_metadata(metadata_file: str) -> CheckMetadata:
    """
    Load check metadata from a file.
    Args:
        metadata_file (str): The path to the metadata file.
    Returns:
        CheckMetadata: The loaded check metadata.
    Raises:
        ValidationError: If the metadata file is not valid.
    """

    try:
        check_metadata = CheckMetadata.parse_file(metadata_file)
    except ValidationError as error:
        logger.critical(f"Metadata from {metadata_file} is not valid: {error}")
        raise error
    else:
        return check_metadata
