#
# This file is distributed under the MIT License. See LICENSE.md for details.
#

from dataclasses import dataclass, field
from pathlib import Path
from typing import Any

import jsonschema
import yaml

from revng.pypeline.container import Container
from revng.pypeline.model import Model, ReadOnlyModel
from revng.pypeline.object import Kind
from revng.pypeline.pipeline import Pipeline
from revng.pypeline.storage.storage_provider import storage_provider_factory_factory
from revng.pypeline.task.requests import Requests
from revng.pypeline.utils import bytes_to_string
from revng.pypeline.utils.registry import get_registry, get_singleton

from .utils import compute_artifact, compute_objects


@dataclass
class Response:
    """A simple wrapper used to enforce correctness and a standard format for
    responses."""

    code: int
    """The HTTP status code of the response."""
    body: Any
    """
    The response body of the request.
    """
    headers: dict[str, str] = field(default_factory=dict)
    """The headers of the response."""
    notifications: list[Any] = field(default_factory=list)
    """List of notifications to send through the NotificationBroker."""

    def to_dict(self):
        result = {
            "code": self.code,
            "body": self.body,
        }
        if len(self.headers) != 0:
            result["headers"] = self.headers
        if len(self.notifications) != 0:
            result["notifications"] = self.notifications
        return result


def get_web_pipeline(version: str, pipeline: Pipeline) -> dict[str, Any]:
    """
    Build and validate the web representation of the pipeline.
    """
    root = Path(__file__).resolve().parent.parent
    with open(root / "web_schema.yml", "r", encoding="utf-8") as f:
        schema = yaml.safe_load(f)

    # Build the web pipeline
    web_pipeline = {
        "version": version,
        "kinds": get_singleton(Kind).type_dict(),  # type: ignore
        "containers": [
            container.type_dict()
            for container in get_registry(Container).values()  # type: ignore [type-abstract]
        ],
        "container_declarations": [
            container_decl.to_dict() for container_decl in pipeline.declarations
        ],
        "root": pipeline.root.id,
        "nodes": [node.to_dict() for node in pipeline.walk_pipeline(stable=True)],
        "artifacts": [artifact.to_dict() for artifact in pipeline.artifacts.values()],
        "analyses": [analysis.to_dict() for analysis in pipeline.analyses.values()],
        "analyses_lists": [
            analysis_list.to_dict() for analysis_list in pipeline.analysis_lists.values()
        ],
    }

    # Ensure that it respects the agreed schema
    validator = jsonschema.Draft7Validator(schema)
    validator.validate(web_pipeline)

    return web_pipeline


class Daemon:
    """The transport agnostic part of the daemon."""

    def __init__(
        self,
        version: str,
        pipeline_yaml: Any,
        pipeline: Any,
        debug: bool,
        storage_provider_url: str,
        cache_dir: str,
    ):
        self.version = version
        self.pipeline_yaml = pipeline_yaml
        self.pipeline = pipeline
        self.debug = debug
        self.cache_dir = cache_dir
        self.storage_provider_factory = storage_provider_factory_factory(storage_provider_url)
        self.web_pipeline = get_web_pipeline(version, pipeline)

    def _get_storage_provider_context(self, request):
        project_id = request["project_id"]
        token = request.get("token")
        return self.storage_provider_factory.get(
            project_id=project_id,
            token=token,
            cache_dir=self.cache_dir,
        )

    async def get_epoch(self, request) -> Response:
        storage_provider_context = self._get_storage_provider_context(request)
        async with storage_provider_context as storage_provider:
            return Response(code=200, body={"epoch": storage_provider.get_epoch()})

    async def get_model(self, request):
        storage_provider_context = self._get_storage_provider_context(request)
        async with storage_provider_context as storage_provider:
            model_type: type[Model] = get_singleton(Model)
            model, epoch = storage_provider.get_model()

        return Response(
            code=200,
            body={
                "epoch": epoch,
                "model_type": model_type.__name__,
                "mime_type": model_type.mime_type(),
                "is_text": model_type.is_text(),
                "model": bytes_to_string(model, is_text=model_type.is_text()),
            },
        )

    def get_pipeline(self) -> Response:
        return Response(
            code=200,
            body=self.web_pipeline,
        )

    async def artifact(self, request) -> Response:
        model_type: type[Model] = get_singleton(Model)  # type: ignore [type-abstract]
        artifacts = request["artifacts"]
        epoch = request["epoch"]

        # Validate data
        for artifact_name, _ in artifacts.items():
            if artifact_name not in self.pipeline.artifacts:
                return Response(
                    code=400,
                    body={
                        "msg": f"Artifact {artifact_name} not found in the pipeline.",
                        "available_artifacts": list(self.pipeline.artifacts.keys()),
                    },
                )

        storage_provider_context = self._get_storage_provider_context(request)
        async with storage_provider_context as storage_provider:
            # Load the model
            model = model_type()
            model_bytes, real_epoch = storage_provider.get_model()
            model.deserialize(model_bytes)

            if real_epoch != epoch:
                return Response(
                    code=409,
                    body={
                        "msg": (
                            f"Epoch mismatch: client has epoch {epoch}, "
                            f"server has epoch {real_epoch}."
                        ),
                    },
                )

            # Process each artifact
            res = {}
            for artifact_name, artifact_data in artifacts.items():
                # Compute the artifact
                res[artifact_name] = compute_artifact(
                    storage_provider=storage_provider,
                    pipeline=self.pipeline,
                    model=ReadOnlyModel(model),
                    artifact_name=artifact_name,
                    artifact_data=artifact_data,
                )

        # Return the artifacts
        return Response(code=200, body={"artifacts": res})

    async def analyze(self, request) -> Response:
        """Process analysis requests"""
        model_type: type[Model] = get_singleton(Model)  # type: ignore [type-abstract]

        # Extract the data
        epoch = request["epoch"]
        analysis = request["analysis"]
        configuration = request.get("configuration", "")
        pipeline_configuration = request.get("pipeline_configuration", {})
        containers = request.get("containers", {})

        # Validate data and normalize to analysis list
        if analysis not in self.pipeline.analyses and analysis not in self.pipeline.analysis_lists:
            return Response(
                code=400,
                body={
                    "msg": f"Analysis {analysis} not found in the pipeline.",
                    "available_analyses": sorted(
                        list(self.pipeline.analyses.keys())
                        + list(self.pipeline.analysis_lists.keys())
                    ),
                },
            )

        # Check that the given containers are declared in the pipeline
        for container_name, objects in containers.items():
            for decl in self.pipeline.declarations:
                if container_name == decl.name:
                    break
            else:
                return Response(
                    code=400,
                    body={
                        "msg": f"Container {container_name} not found in the pipeline.",
                        "available_containers": sorted(
                            decl.name for decl in self.pipeline.declarations
                        ),
                    },
                )

        storage_provider_context = self._get_storage_provider_context(request)
        async with storage_provider_context as storage_provider:
            # Load the model
            model = model_type()
            model_bytes, real_epoch = storage_provider.get_model()
            model.deserialize(model_bytes)

            if real_epoch != epoch:
                return Response(
                    code=409,
                    body={
                        "msg": (
                            f"Epoch mismatch: client has epoch {epoch}, "
                            f"server has epoch {real_epoch}."
                        ),
                    },
                )

            # Run an analysis
            if analysis in self.pipeline.analyses:
                current_model = ReadOnlyModel(model)
                # Setup the requests
                requests = Requests()
                for binding in self.pipeline.analyses[analysis].bindings:
                    kind: Kind = binding.container_type.kind
                    objects = containers.get(binding.name)
                    if objects is not None and not isinstance(objects, list):
                        return Response(
                            code=400,
                            body={
                                "msg": (
                                    f"Objects for container {binding.name} must be a "
                                    f"list, got {type(objects)}",
                                ),
                            },
                        )
                    requests.insert(binding, compute_objects(current_model, kind, objects))

                # Run the analysis
                new_model, invalidated = self.pipeline.run_analysis(
                    model=current_model,
                    analysis_name=analysis,
                    requests=requests,
                    analysis_configuration=configuration,
                    pipeline_configuration=pipeline_configuration,
                    storage_provider=storage_provider,
                )
            else:
                analysis_list = self.pipeline.analysis_lists[analysis]
                new_model, invalidated = self.pipeline.run_analysis_list(
                    model=ReadOnlyModel(model),
                    analysis_list=analysis_list,
                    analysis_configuration=configuration,
                    pipeline_configuration=pipeline_configuration,
                    storage_provider=storage_provider,
                )

            # Compute the diff between the original model and the final one
            diff = str(model.diff(new_model))
            # TODO: this can be done much more efficiently
            new_epoch = storage_provider.get_epoch()

        # Only return cacheable artifacts invalidations
        invalidated_artifacts: list[dict[str, Any]] = []
        for container_location, object_ids in invalidated.items():
            artifact = self.pipeline.savepoint_id_to_artifact.get(container_location.savepoint_id)
            if artifact is None:
                continue
            invalidated_artifacts.append(
                {
                    "name": artifact.name,
                    "configuration": artifact.configuration,
                    "object_ids": [object_id.serialize() for object_id in object_ids],
                }
            )

        # Return the updated model
        return Response(
            code=200,
            body={
                "epoch": new_epoch,
                "diff": diff,
            },
            notifications=[
                {
                    "type": "analysis",
                    "analysis": analysis,
                    "epoch": new_epoch,
                    "diff": diff,
                    "invalidated": invalidated_artifacts,
                }
            ],
        )