from collections.abc import Mapping
import os
from typing import Type, TypeVar

from werkzeug import Request
import werkzeug
import werkzeug.exceptions
from werkzeug.routing import Map, Rule

from ..config.config import DifyPluginEnv
from .entities.plugin.setup import (
    PluginAsset,
    PluginConfiguration,
)
from ..interfaces.model.ai_model import AIModel
from ..entities.model.provider import ModelProviderConfiguration
from ..interfaces.model.large_language_model import LargeLanguageModel
from ..interfaces.model import ModelProvider
from ..entities.model import ModelType
from ..interfaces.model.moderation_model import ModerationModel
from ..interfaces.model.rerank_model import RerankModel
from ..interfaces.model.speech2text_model import Speech2TextModel
from ..interfaces.model.text_embedding_model import TextEmbeddingModel
from ..interfaces.model.tts_model import TTSModel
from ..entities.tool import ToolConfiguration, ToolProviderConfiguration
from ..interfaces.tool import Tool, ToolProvider
from ..entities.endpoint import EndpointProviderConfiguration
from ..interfaces.endpoint import Endpoint
from ..core.utils.class_loader import (
    load_multi_subclasses_from_source,
    load_single_subclass_from_source,
)
from ..core.utils.yaml_loader import load_yaml_file

T = TypeVar("T")


class PluginRegistration:
    configuration: PluginConfiguration
    tools_configuration: list[ToolProviderConfiguration]
    tools_mapping: dict[
        str,
        tuple[
            ToolProviderConfiguration,
            Type[ToolProvider],
            dict[str, tuple[ToolConfiguration, Type[Tool]]],
        ],
    ]

    models_configuration: list[ModelProviderConfiguration]
    models_mapping: dict[
        str,
        tuple[
            ModelProviderConfiguration,
            ModelProvider,
            dict[ModelType, AIModel],
        ],
    ]
    endpoints_configuration: list[EndpointProviderConfiguration]
    endpoints: Map
    files: list[PluginAsset]

    def __init__(self, config: DifyPluginEnv) -> None:
        """
        Initialize plugin
        """
        self.tools_configuration = []
        self.models_configuration = []
        self.tools_mapping = {}
        self.models_mapping = {}
        self.endpoints_configuration = []
        self.endpoints = Map()
        self.files = []

        # load plugin configuration
        self._load_plugin_configuration()
        # load plugin class
        self._resolve_plugin_cls()
        # load plugin assets
        self._load_plugin_assets()

    def _load_plugin_assets(self):
        """
        load plugin assets
        """
        # open _assets folder
        with os.scandir("_assets") as entries:
            for entry in entries:
                if entry.is_file():
                    with open(entry, "rb") as f:
                        self.files.append(
                            PluginAsset(filename=entry.name, data=f.read().hex())
                        )

    def _load_plugin_configuration(self):
        """
        load basic plugin configuration from manifest.yaml
        """
        try:
            file = load_yaml_file("manifest.yaml")
            self.configuration = PluginConfiguration(**file)

            for provider in self.configuration.plugins.tools:
                fs = load_yaml_file(provider)
                tool_provider_configuration = ToolProviderConfiguration(**fs)
                self.tools_configuration.append(tool_provider_configuration)
            for provider in self.configuration.plugins.models:
                fs = load_yaml_file(provider)
                model_provider_configuration = ModelProviderConfiguration(**fs)
                self.models_configuration.append(model_provider_configuration)
            for provider in self.configuration.plugins.endpoints:
                fs = load_yaml_file(provider)
                endpoint_configuration = EndpointProviderConfiguration(**fs)
                self.endpoints_configuration.append(endpoint_configuration)
        except Exception as e:
            raise ValueError(f"Error loading plugin configuration: {str(e)}")

    def _resolve_tool_providers(self):
        """
        walk through all the tool providers and tools and load the classes from sources
        """
        for provider in self.tools_configuration:
            # load class
            source = provider.extra.python.source
            # remove extension
            module_source = os.path.splitext(source)[0]
            # replace / with .
            module_source = module_source.replace("/", ".")
            cls = load_single_subclass_from_source(
                module_name=module_source,
                script_path=os.path.join(os.getcwd(), source),
                parent_type=ToolProvider,
            )

            # load tools class
            tools = {}
            for tool in provider.tools:
                tool_source = tool.extra.python.source
                tool_module_source = os.path.splitext(tool_source)[0]
                tool_module_source = tool_module_source.replace("/", ".")
                tool_cls = load_single_subclass_from_source(
                    module_name=tool_module_source,
                    script_path=os.path.join(os.getcwd(), tool_source),
                    parent_type=Tool,
                )

                if tool_cls._is_get_runtime_parameters_overridden():
                    tool.has_runtime_parameters = True

                tools[tool.identity.name] = (tool, tool_cls)

            self.tools_mapping[provider.identity.name] = (provider, cls, tools)

    def _is_strict_subclass(self, cls: Type[T], *parent_cls: Type[T]) -> bool:
        """
        check if the class is a strict subclass of one of the parent classes
        """
        for parent in parent_cls:
            if issubclass(cls, parent) and cls != parent:
                return True

        return False

    def _resolve_model_providers(self):
        """
        walk through all the model providers and models and load the classes from sources
        """
        for provider in self.models_configuration:
            # load class
            source = provider.extra.python.provider_source
            # remove extension
            module_source = os.path.splitext(source)[0]
            # replace / with .
            module_source = module_source.replace("/", ".")
            cls = load_single_subclass_from_source(
                module_name=module_source,
                script_path=os.path.join(os.getcwd(), source),
                parent_type=ModelProvider,
            )

            # load models class
            models = {}
            for model_source in provider.extra.python.model_sources:
                model_module_source = os.path.splitext(model_source)[0]
                model_module_source = model_module_source.replace("/", ".")
                model_classes = load_multi_subclasses_from_source(
                    module_name=model_module_source,
                    script_path=os.path.join(os.getcwd(), model_source),
                    parent_type=AIModel,
                )

                for model_cls in model_classes:
                    if self._is_strict_subclass(
                        model_cls,
                        LargeLanguageModel,
                        TextEmbeddingModel,
                        RerankModel,
                        TTSModel,
                        Speech2TextModel,
                        ModerationModel,
                    ):
                        models[model_cls.model_type] = model_cls(provider.models)  # type: ignore

            provider_instance = cls(provider, models)  # type: ignore
            self.models_mapping[provider.provider] = (
                provider,
                provider_instance,
                models,
            )

    def _resolve_endpoints(self):
        """
        load endpoints
        """
        for endpoint_provider in self.endpoints_configuration:
            # load endpoints
            for endpoint in endpoint_provider.endpoints:
                # remove extension
                module_source = os.path.splitext(endpoint.extra.python.source)[0]
                # replace / with .
                module_source = module_source.replace("/", ".")
                endpoint_cls = load_single_subclass_from_source(
                    module_name=module_source,
                    script_path=os.path.join(os.getcwd(), endpoint.extra.python.source),
                    parent_type=Endpoint,
                )

                self.endpoints.add(
                    Rule(
                        endpoint.path, methods=[endpoint.method], endpoint=endpoint_cls
                    )
                )

    def _resolve_plugin_cls(self):
        """
        register all plugin extensions
        """
        # load tool providers and tools
        self._resolve_tool_providers()

        # load model providers and models
        self._resolve_model_providers()

        # load endpoints
        self._resolve_endpoints()

    def get_tool_provider_cls(self, provider: str):
        """
        get the tool provider class by provider name
        :param provider: provider name
        :return: tool provider class
        """
        for provider_registration in self.tools_mapping:
            if provider_registration == provider:
                return self.tools_mapping[provider_registration][1]

    def get_tool_cls(self, provider: str, tool: str):
        """
        get the tool class by provider
        :param provider: provider name
        :param tool: tool name
        :return: tool class
        """
        for provider_registration in self.tools_mapping:
            if provider_registration == provider:
                registration = self.tools_mapping[provider_registration][2].get(tool)
                if registration:
                    return registration[1]

    def get_model_provider_instance(self, provider: str):
        """
        get the model provider class by provider name
        :param provider: provider name
        :return: model provider class
        """
        for provider_registration in self.models_mapping:
            if provider_registration == provider:
                return self.models_mapping[provider_registration][1]

    def get_model_instance(self, provider: str, model_type: ModelType):
        """
        get the model class by provider
        :param provider: provider name
        :param model: model name
        :return: model class
        """
        for provider_registration in self.models_mapping:
            if provider_registration == provider:
                registration = self.models_mapping[provider_registration][2].get(
                    model_type
                )
                if registration:
                    return registration

    def dispatch_endpoint_request(
        self, request: Request
    ) -> tuple[Type[Endpoint], Mapping]:
        """
        dispatch endpoint request, match the request to the registered endpoints

        returns the endpoint and the values
        """
        adapter = self.endpoints.bind_to_environ(request.environ)
        try:
            endpoint, values = adapter.match()
            return endpoint, values
        except werkzeug.exceptions.HTTPException as e:
            raise ValueError(f"Failed to dispatch endpoint request: {str(e)}")