from __future__ import annotations

from collections.abc import Mapping
from copy import deepcopy
from typing import Any

import pytest

from cmvr_edge_ai.compiler import PipelineCompileError, compile_pipeline
from cmvr_edge_ai.config import load_config_data
from cmvr_edge_ai.core import Envelope, Operator, Sink, Source
from cmvr_edge_ai.plugins import (
    InvocationCardinality,
    PluginKind,
    PluginRegistry,
    PluginSpec,
)


class EmptySource(Source):
    async def messages(self):  # type: ignore[no-untyped-def]
        if False:
            yield Envelope("unused")


class IdentityOperator(Operator):
    async def process(
        self, envelope: Envelope[Any], input_port: str = "input"
    ) -> Envelope[Any]:
        del input_port
        return envelope


class NullSink(Sink):
    async def consume(
        self, envelope: Envelope[Any], input_port: str = "input"
    ) -> None:
        del envelope, input_port


def _source_factory(node_id: str, params: Mapping[str, Any]) -> EmptySource:
    del node_id, params
    return EmptySource()


def _operator_factory(
    node_id: str, params: Mapping[str, Any]
) -> IdentityOperator:
    del node_id, params
    return IdentityOperator()


def _sink_factory(node_id: str, params: Mapping[str, Any]) -> NullSink:
    del node_id, params
    return NullSink()


def _registry() -> PluginRegistry:
    registry = PluginRegistry()
    registry.register(
        PluginSpec(
            "server.request_source@1",
            PluginKind.SOURCE,
            _source_factory,
            outputs={"requests": "InferenceRequest/v1"},
        )
    )
    registry.register(
        PluginSpec(
            "test.image_decoder@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"requests": "InferenceRequest/v1"},
            outputs={"frames": "ImageFrame/v1"},
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "test.frame_identity@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"frames": "ImageFrame/v1"},
            outputs={"frames": "ImageFrame/v1"},
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "test.unsafe_identity@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"requests": "InferenceRequest/v1"},
            outputs={"frames": "ImageFrame/v1"},
        )
    )
    registry.register(
        PluginSpec(
            "detection.model@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"frames": "ImageFrame/v1"},
            outputs={"detections": "DetectionResult/v1"},
            route_model_param="model",
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "test.generic_model@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"requests": "InferenceRequest/v1"},
            outputs={"responses": "InferenceResponse/v1"},
            route_model_param="model_id",
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "test.detector_bypass@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"frames": "ImageFrame/v1"},
            outputs={"detections": "DetectionResult/v1"},
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "server.detection_response@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"detections": "DetectionResult/v1"},
            outputs={"responses": "InferenceResponse/v1"},
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "test.untyped_response@1",
            PluginKind.OPERATOR,
            _operator_factory,
            inputs={"detections": "DetectionResult/v1"},
            outputs={"responses": "*"},
            invocation_cardinality=InvocationCardinality.EXACTLY_ONE,
        )
    )
    registry.register(
        PluginSpec(
            "server.response_sink@1",
            PluginKind.SINK,
            _sink_factory,
            inputs={"responses": "InferenceResponse/v1"},
        )
    )
    registry.register(
        PluginSpec(
            "test.active_source@1",
            PluginKind.SOURCE,
            _source_factory,
            outputs={"events": "TextEvent/v1"},
        )
    )
    registry.register(
        PluginSpec(
            "test.active_sink@1",
            PluginKind.SINK,
            _sink_factory,
            inputs={"events": "TextEvent/v1"},
        )
    )
    return registry


def _valid_nodes() -> dict[str, dict[str, Any]]:
    return {
        "request": {
            "uses": "server.request_source@1",
            "with": {"category": "detect.mobile_phone"},
        },
        "decode": {"uses": "test.image_decoder@1"},
        "detector": {
            "uses": "detection.model@1",
            "with": {"model": "mobile-phone@1"},
        },
        "response": {
            "uses": "server.detection_response@1",
            "with": {"category": "detect.mobile_phone"},
        },
        "sink": {"uses": "server.response_sink@1"},
    }


def _valid_edges() -> list[dict[str, Any]]:
    return [
        {"from": "request.requests", "to": "decode.requests"},
        {"from": "decode.frames", "to": "detector.frames"},
        {"from": "detector.detections", "to": "response.detections"},
        {"from": "response.responses", "to": "sink.responses"},
    ]


def _config(
    *,
    nodes: dict[str, dict[str, Any]] | None = None,
    edges: list[dict[str, str]] | None = None,
):  # type: ignore[no-untyped-def]
    return load_config_data(
        {
            "api_version": "cmvr.edge.ai/v1",
            "pipelines": {
                "remote": {
                    "nodes": deepcopy(nodes if nodes is not None else _valid_nodes()),
                    "edges": deepcopy(edges if edges is not None else _valid_edges()),
                }
            },
            "server": {
                "enabled": True,
                "routes": {
                    "detect.mobile_phone": {
                        "pipeline": "remote",
                        "model_id": "mobile-phone@1",
                    }
                },
            },
        }
    )


def test_compile_accepts_strict_detection_invocation_pipeline() -> None:
    compiled = compile_pipeline(_config(), "remote", _registry())

    assert compiled.pipeline_id == "remote"
    assert set(compiled.plugin_specs) == set(_valid_nodes())


@pytest.mark.parametrize(
    ("boundary", "message"),
    [
        ("request", "exactly one server.request_source@1"),
        ("sink", "exactly one server.response_sink@1"),
    ],
)
def test_compile_requires_one_request_and_response_boundary(
    boundary: str, message: str
) -> None:
    nodes = _valid_nodes()
    del nodes[boundary]
    edges = [
        edge
        for edge in _valid_edges()
        if not edge["from"].startswith(boundary + ".")
        and not edge["to"].startswith(boundary + ".")
    ]

    with pytest.raises(PipelineCompileError, match=message):
        compile_pipeline(_config(nodes=nodes, edges=edges), "remote", _registry())


@pytest.mark.parametrize(
    ("original", "duplicate", "message"),
    [
        ("request", "request_copy", "exactly one server.request_source@1"),
        ("sink", "sink_copy", "exactly one server.response_sink@1"),
    ],
)
def test_compile_rejects_duplicate_invocation_boundaries(
    original: str, duplicate: str, message: str
) -> None:
    nodes = _valid_nodes()
    nodes[duplicate] = deepcopy(nodes[original])

    with pytest.raises(PipelineCompileError, match=message):
        compile_pipeline(_config(nodes=nodes), "remote", _registry())


@pytest.mark.parametrize("node_id", ["request", "response"])
def test_compile_requires_source_and_response_categories_to_match_route(
    node_id: str,
) -> None:
    nodes = _valid_nodes()
    nodes[node_id]["with"]["category"] = "detect.other"  # type: ignore[index]

    with pytest.raises(PipelineCompileError, match="does not match route category"):
        compile_pipeline(_config(nodes=nodes), "remote", _registry())


def test_compile_requires_exactly_one_registered_detection_node() -> None:
    missing = _valid_nodes()
    missing["detector"]["uses"] = "test.detector_bypass@1"
    with pytest.raises(PipelineCompileError, match="exactly one detection.model@1"):
        compile_pipeline(_config(nodes=missing), "remote", _registry())

    duplicate = _valid_nodes()
    duplicate["detector_copy"] = deepcopy(duplicate["detector"])
    with pytest.raises(PipelineCompileError, match="exactly one detection.model@1"):
        compile_pipeline(_config(nodes=duplicate), "remote", _registry())


def test_compile_requires_detector_model_to_match_route() -> None:
    nodes = _valid_nodes()
    nodes["detector"]["with"]["model"] = "different@1"  # type: ignore[index]

    with pytest.raises(PipelineCompileError, match="does not match route model_id"):
        compile_pipeline(_config(nodes=nodes), "remote", _registry())


def test_compile_rejects_rate_limited_passive_detector() -> None:
    nodes = _valid_nodes()
    nodes["detector"]["with"]["max_fps"] = 1.0  # type: ignore[index]

    with pytest.raises(PipelineCompileError, match="must not set max_fps"):
        compile_pipeline(_config(nodes=nodes), "remote", _registry())


def test_compile_requires_exactly_one_output_contract_for_each_operator() -> None:
    nodes = _valid_nodes()
    nodes["decode"]["uses"] = "test.unsafe_identity@1"

    with pytest.raises(PipelineCompileError, match="invocation_cardinality"):
        compile_pipeline(_config(nodes=nodes), "remote", _registry())


@pytest.mark.parametrize(
    ("profile", "overflow"),
    [
        ("telemetry", "drop_oldest"),
        ("request", "reject"),
    ],
)
def test_compile_requires_lossless_blocking_invocation_edges(
    profile: str,
    overflow: str,
) -> None:
    edges: list[dict[str, Any]] = deepcopy(_valid_edges())
    edges[0]["qos"] = {"profile": profile, "overflow": overflow}

    with pytest.raises(PipelineCompileError, match="must use qos"):
        compile_pipeline(_config(edges=edges), "remote", _registry())


def test_compile_validates_route_model_for_non_detection_adapter() -> None:
    def config(model_id: str):  # type: ignore[no-untyped-def]
        return load_config_data(
            {
                "api_version": "cmvr.edge.ai/v1",
                "pipelines": {
                    "gauge": {
                        "nodes": {
                            "request": {
                                "uses": "server.request_source@1",
                                "with": {"category": "gauge.analog"},
                            },
                            "reader": {
                                "uses": "test.generic_model@1",
                                "with": {
                                    "category": "gauge.analog",
                                    "model_id": model_id,
                                },
                            },
                            "sink": {"uses": "server.response_sink@1"},
                        },
                        "edges": [
                            {
                                "from": "request.requests",
                                "to": "reader.requests",
                            },
                            {
                                "from": "reader.responses",
                                "to": "sink.responses",
                            },
                        ],
                    }
                },
                "server": {
                    "enabled": True,
                    "routes": {
                        "gauge.analog": {
                            "pipeline": "gauge",
                            "model_id": "ethz-gauge@1",
                        }
                    },
                },
            }
        )

    assert compile_pipeline(config("ethz-gauge@1"), "gauge", _registry())
    with pytest.raises(PipelineCompileError, match="route model_id"):
        compile_pipeline(config("another-gauge@1"), "gauge", _registry())


def test_compile_rejects_fan_out_and_merge_without_join_semantics() -> None:
    nodes = _valid_nodes()
    nodes["left"] = {"uses": "test.frame_identity@1"}
    nodes["right"] = {"uses": "test.frame_identity@1"}
    edges = [
        {"from": "request.requests", "to": "decode.requests"},
        {"from": "decode.frames", "to": "left.frames"},
        {"from": "decode.frames", "to": "right.frames"},
        {"from": "left.frames", "to": "detector.frames"},
        {"from": "right.frames", "to": "detector.frames"},
        {"from": "detector.detections", "to": "response.detections"},
        {"from": "response.responses", "to": "sink.responses"},
    ]

    with pytest.raises(PipelineCompileError, match="single linear path"):
        compile_pipeline(_config(nodes=nodes, edges=edges), "remote", _registry())


def test_compile_requires_a_directed_request_to_response_path() -> None:
    edges = _valid_edges()[:-1]

    with pytest.raises(PipelineCompileError, match="no directed path"):
        compile_pipeline(_config(edges=edges), "remote", _registry())


@pytest.mark.parametrize("connect_branch", [False, True])
def test_compile_rejects_orphan_and_dead_end_branch_nodes(
    connect_branch: bool,
) -> None:
    nodes = _valid_nodes()
    nodes["unused"] = {"uses": "test.frame_identity@1"}
    edges = _valid_edges()
    if connect_branch:
        edges.append({"from": "decode.frames", "to": "unused.frames"})

    with pytest.raises(PipelineCompileError, match="outside every valid"):
        compile_pipeline(
            _config(nodes=nodes, edges=edges),
            "remote",
            _registry(),
        )


def test_compile_rejects_path_that_bypasses_required_detector() -> None:
    nodes = _valid_nodes()
    nodes["bypass"] = {"uses": "test.detector_bypass@1"}
    edges = _valid_edges()
    edges.extend(
        [
            {"from": "decode.frames", "to": "bypass.frames"},
            {"from": "bypass.detections", "to": "response.detections"},
        ]
    )

    with pytest.raises(PipelineCompileError, match="bypasses required detection"):
        compile_pipeline(
            _config(nodes=nodes, edges=edges),
            "remote",
            _registry(),
        )


def test_compile_requires_one_typed_response_producer() -> None:
    nodes = _valid_nodes()
    nodes["response"]["uses"] = "test.untyped_response@1"

    with pytest.raises(PipelineCompileError, match="emits InferenceResponse/v1"):
        compile_pipeline(_config(nodes=nodes), "remote", _registry())


def test_active_push_pipeline_is_not_subject_to_invocation_validation() -> None:
    config = load_config_data(
        {
            "api_version": "cmvr.edge.ai/v1",
            "pipelines": {
                "active": {
                    "nodes": {
                        "source": {"uses": "test.active_source@1"},
                        "sink": {"uses": "test.active_sink@1"},
                    },
                    "edges": [
                        {"from": "source.events", "to": "sink.events"},
                    ],
                }
            },
        }
    )

    compiled = compile_pipeline(config, "active", _registry())

    assert compiled.pipeline_id == "active"


def test_disabled_server_routes_do_not_change_active_pipeline_validation() -> None:
    config = load_config_data(
        {
            "api_version": "cmvr.edge.ai/v1",
            "pipelines": {
                "active": {
                    "nodes": {
                        "source": {"uses": "test.active_source@1"},
                        "sink": {"uses": "test.active_sink@1"},
                    },
                    "edges": [
                        {"from": "source.events", "to": "sink.events"},
                    ],
                }
            },
            "server": {
                "enabled": False,
                "routes": {
                    "detect.mobile_phone": {
                        "pipeline": "active",
                        "model_id": "mobile-phone@1",
                    }
                },
            },
        }
    )

    assert compile_pipeline(config, "active", _registry()).pipeline_id == "active"