from dataclasses import dataclass, field
from pathlib import Path
from typing import List, Tuple, Optional, Dict
import glob
import yaml
import itertools
from paths import PRECICE_TESTS_DIR, PRECICE_TUTORIAL_DIR


@dataclass
class BuildArgument:
    """Represents a BuildArgument needed to run the docker container"""

    description: str
    """The description of the parameter."""

    key: str
    """The name of the parameter."""

    value_options: Optional[list] = None
    """The optinal list of value options for the parameter. If none is suplied all values are accepted"""

    default: Optional[str] = None
    """The default value for the parameter."""

    @property
    def required(self) -> bool:
        """
        Check if the BuildArgument need to be supplied via CommandLineArgs

        Returns:
            bool: True if the parameter is required, False otherwise.
        """
        return False if self.default else True

    def __eq__(self, other) -> bool:
        if isinstance(other, BuildArgument):
            return self.key == other.key
        return False

    def __hash__(self) -> int:
        return hash(self.key)

    def __repr__(self) -> str:
        return f"{self.key}"


class BuildArguments:
    """Represents a collection of build_arguments used to built the docker images."""

    def __init__(self, arguments: List[BuildArgument]):
        self.arguments = arguments

    @classmethod
    def from_components_yaml(cls, data):
        """
        Create a list of Paramters from the components YAML data.

        Args:
            data: The components YAML data.
        """
        arguments = []
        for argument_name, argument_dict in data['build_arguments'].items():
            # TODO maybe **params
            description = argument_dict.get(
                'description', f"No description provided for {argument_name}")
            key = argument_name
            default = argument_dict.get('default', None)
            value_options = argument_dict.get('value_options', None)

            arguments.append(BuildArgument(
                description, key, value_options, default))

        return cls(arguments)

    def __iter__(self):
        return iter(self.arguments)

    def __getitem__(self, index):
        return self.arguments[index]

    def __setitem__(self, index, value):
        self.arguments[index] = value

    def __len__(self):
        return len(self.arguments)

    def __repr__(self) -> str:
        return f"{self.arguments}"


@dataclass
class Component:
    """
    Represents a component like e.g the openfoam-adapter
    """

    name: str
    template: str
    repository: str
    parameters: BuildArguments

    def __eq__(self, other):
        if isinstance(other, Component):
            return self.name == other.name
        return False

    def __repr__(self) -> str:
        return f"{self.name}"


class Components(list):
    """
    Represents the collection of components read in from the components.yaml
    """

    def __init__(self, components: List[Component]):
        self.components = components

    @classmethod
    def from_yaml(cls, path):
        """
        Creates a Components instance from a YAML file.

        Args:
            path: The path to the YAML file.

        Returns:
            An instance of Components.
        """
        components = []
        with open(path, 'r') as f:
            data = yaml.safe_load(f)
            for component_name in data:
                parameters = BuildArguments.from_components_yaml(
                    data[component_name])
                repository = data[component_name]["repository"]
                template = data[component_name]["template"]
                components.append(
                    Component(component_name, template, repository, parameters))

        return cls(components)

    def __iter__(self):
        return iter(self.components)

    def __getitem__(self, index):
        return self.components[index]

    def __setitem__(self, index, value):
        self.components[index] = value

    def __len__(self):
        return len(self.components)

    def get_by_name(self, name_to_search):
        """
        Retrieves a component by its name.

        Args:
            name_to_search: The name of the component to search for.

        Returns:
            The component with the specified name, or None if not found.
        """
        for component in self.components:
            if component.name == name_to_search:
                return component

        return None


@dataclass
class Participant:
    """Represents a participant in a coupled simulation"""

    name: str
    """The name of the participant."""

    def __eq__(self, other) -> bool:
        if isinstance(other, Participant):
            return self.name == other.name
        return False

    def __repr__(self) -> str:
        return f"{self.name}"

# Forward declaration of tutorial


class Tutorial:
    pass


@dataclass
class Case:
    """
    Represents a case inside of a tutorial.
    """
    name: str
    participant: str
    path: Path
    run_cmd: str
    tutorial: Tutorial = field(init=False)
    component: Component

    def __post_init__(self):
        """
        Performs sanity checks after initializing the Case instance.
        """
        if not self.component:
            raise Exception(
                f'Tried to instantiate the case {self.name} but failed. Reason: Could not find the component it uses in the components.yaml file.')

    @classmethod
    def from_dict(cls, name, dict, available_components):
        """
        Creates a Case instance from a the tutorial yaml dict.

        Args:
            name: The name of the case.
            dict: The dictionary containing the case data.
            available_components: Components read from the components.yaml file

        Returns:
            An instance of the Case but without the tutorial set, this needs to be done later
        """
        participant = dict["participant"]
        path = Path(dict["directory"])
        run_cmd = dict["run"]

        component = available_components.get_by_name(dict["component"])
        return cls(name, participant, path, run_cmd, component)

    def __repr__(self) -> str:
        return f"{self.name}"

    def __hash__(self) -> int:
        return hash(f"{self.name,self.participant,self.component,self.tutorial}")

    def __eq__(self, other) -> bool:
        if isinstance(other, Case):
            return (
                self.name == other.name) and (
                self.participant == other.participant) and (
                self.component == other.component) and (
                self.tutorial == other.tutorial)
        return False


@dataclass
class CaseCombination:
    """Represents a case combination able to run the tutorial"""

    cases: Tuple[Case]
    tutorial: Tutorial

    def __eq__(self, other) -> bool:
        if isinstance(other, CaseCombination):
            return set(self.cases) == set(other.cases)
        return False

    def __repr__(self) -> str:
        return f"{self.cases}"

    @classmethod
    def from_string_list(cls, case_names: List[str], tutorial: Tutorial):
        cases = []
        for case_name in case_names:
            cases.append(tutorial.get_case_by_string(case_name))
        return cls(tuple(cases), tutorial)

    @classmethod
    def from_cases_tuple(cls, cases: Tuple[Case], tutorial: Tutorial):
        return cls(cases, tutorial)


@dataclass
class ReferenceResult:
    path: Path
    case_combination: CaseCombination

    def __repr__(self) -> str:
        return f"{self.path.as_posix()}"

    def __post_init__(self):
        # built full path
        self.path = PRECICE_TUTORIAL_DIR / self.path


@dataclass
class Tutorial:
    """
    Represents a tutorial with various attributes and methods.
    """

    name: str
    path: Path
    url: str
    participants: List[str]
    cases: List[Case]
    case_combinations: List[CaseCombination] = field(init=False)

    def __post_init__(self):
        for case in self.cases:
            case.tutorial = self
        # get all case combinations

        def get_all_possible_case_combinations(tutorial: Tutorial):
            case_combinations = []
            cases_dict = {}
            for participant in tutorial.participants:
                cases_dict[participant] = []
            for case in tutorial.cases:
                cases_dict[case.participant].append(case)

            for combination in itertools.product(*[cases_dict[participant] for participant in tutorial.participants]):
                case_combinations.append(CaseCombination.from_cases_tuple(combination, self))
            return case_combinations

        self.case_combinations = get_all_possible_case_combinations(self)

    def __eq__(self, other) -> bool:
        if isinstance(other, Tutorial):
            return (self.name == other.name) and (self.path == other.path)
        return False

    def __hash__(self) -> int:
        return hash(self.path)

    def __repr__(self) -> str:
        """
        Returns a string representation of the Tutorial.
        """
        return f"""\n{self.name}:
        Path: {self.path}
        URL: {self.url}
        Participants: {self.participants}
        Cases: {self.cases}
        """

    def get_case_by_string(self, case_name: str) -> Optional[Case]:
        """
        Retrieves Optional case based on the case_name

        Args:
            case_name: the name of the case in search

        Returns:
            Either None or a Case mathing the casename
        """
        for case in self.cases:
            if case.name == case_name:
                return case
        return None

    @classmethod
    def from_yaml(cls, path, available_components):
        """
        Creates a Tutorial instance from a YAML file.

        Args:
            path: The path to the YAML file.
            available_components: The Components instance containing available components.

        Returns:
            An instance of Tutorial.
        """
        with open(path, 'r') as f:
            data = yaml.safe_load(f)
            name = data['name']
            path = PRECICE_TUTORIAL_DIR / data['path']
            url = data['url']
            participants = data.get('participants', [])
            cases_raw = data.get('cases', {})
            cases = []
            for case_name in cases_raw.keys():
                cases.append(Case.from_dict(
                    case_name, cases_raw[case_name], available_components))
            return cls(name, path, url, participants, cases)


class Tutorials(list):
    """
    Represents a collection of tutorials.
    """

    def __iter__(self):
        return iter(self.tutorials)

    def __getitem__(self, index):
        return self.tutorials[index]

    def __setitem__(self, index, value):
        self.tutorials[index] = value

    def __len__(self):
        return len(self.tutorials)

    def __init__(self, tutorials: List[Tutorial]):
        """
        Initializes the Tutorials instance with a base path and a list of tutorials.

        Args:
            path: The path to the folder containing the tutorial folders.
            tutorials: The list of tutorials.
        """
        self.tutorials = tutorials

    def get_by_path(self, relative_path: str) -> Optional[Tutorial]:
        """
        Retrieves a Tutorial by its relative path.

        Args:
            path_to_search: The path of the Tutorial to search for.

        Returns:
            The Tutorial with the specified path, or None if not found.
        """

        for tutorial in self.tutorials:
            if tutorial.path.name == relative_path:
                return tutorial

        return None

    @classmethod
    def from_path(cls, path):
        """
        Read ins all the metadata.yaml files available in path/*/metadata.yaml

        Args:
            path: The path containing the tutorial folders
        """

        yaml_files = glob.glob(f'{path}/*/metadata.yaml')
        tutorials = []
        available_components = Components.from_yaml(
            PRECICE_TESTS_DIR / "components.yaml")
        for yaml_path in yaml_files:
            tut = Tutorial.from_yaml(yaml_path, available_components)
            tutorials.append(tut)
        return cls(tutorials)