"""C10 cache-provisioning factory (AZ-321).

Composition-root wiring for the AZ-321 :class:`EngineCompiler`. Reads
``config.components['c10_provisioning']`` for the backbone corpus,
resolves the :class:`InferenceRuntime` strategy via
:func:`gps_denied_onboard.runtime_root.inference_factory.build_inference_runtime`,
and returns a ready-to-call :class:`EngineCompiler`.

Backbone resolution is config-driven: the YAML enumerates the
project's engine corpus (initially DINOv2-VPR + LightGlue + ALIKED
per the AZ-321 task spec); adding a model is a config change rather
than a code change.
"""

from __future__ import annotations

from pathlib import Path
from typing import TYPE_CHECKING, Any

from gps_denied_onboard.components.c10_provisioning import (
    BackboneSpec,
    C10BatcherConfig,
    CacheProvisionerImpl,
    DescriptorBatcher,
    DescriptorIndexRebuilder,
    Ed25519ManifestSigner,
    EngineCompiler,
    FilelockFileLockFactory,
    ManifestBuilder,
    ManifestVerifierImpl,
    TileBboxRecord,
    TileHashRecord,
    TilePixelOpener,
    TilesByBboxBatchQuery,
    TilesByBboxQuery,
)
from gps_denied_onboard.components.c10_provisioning.config import (
    BackboneConfig,
    C10ProvisioningConfig,
)
from gps_denied_onboard.components.c10_provisioning.interface import (
    BackboneEmbedder,
)
from gps_denied_onboard.helpers.sha256_sidecar import Sha256Sidecar
from gps_denied_onboard.logging import get_logger
from gps_denied_onboard.runtime_root.inference_factory import (
    build_inference_runtime,
)

if TYPE_CHECKING:
    from gps_denied_onboard._types.inference import PrecisionMode
    from gps_denied_onboard._types.manifests import HostCapabilities
    from gps_denied_onboard.clock import Clock
    from gps_denied_onboard.components.c6_tile_cache import (
        DescriptorIndex,
        TileMetadataStore,
        TileStore,
    )
    from gps_denied_onboard.config.schema import Config

__all__ = [
    "build_backbone_specs",
    "build_cache_provisioner",
    "build_descriptor_batcher",
    "build_engine_compiler",
    "build_manifest_builder",
    "build_manifest_verifier",
    "c6_descriptor_index_to_rebuilder",
    "c6_tile_metadata_store_to_tiles_batch_query",
    "c6_tile_metadata_store_to_tiles_query",
    "c6_tile_store_to_pixel_opener",
]


def build_engine_compiler(config: Config) -> EngineCompiler:
    """Construct a wired :class:`EngineCompiler` from ``config``.

    The factory:

    1. Resolves the :class:`InferenceRuntime` via the existing
       C7 factory (honouring the ``BUILD_*`` gating and the runtime
       selection in ``config.components['c7_inference']``).
    2. Names a c10-scoped structured logger.
    3. Hands both to :class:`EngineCompiler`.

    The :class:`BackboneSpec` corpus is NOT materialised by this
    factory — call :func:`build_backbone_specs` separately so the
    operator binary can pick up the spec list after Step 7 of the
    autodev flow without dragging an :class:`InferenceRuntime` along.
    """

    runtime = build_inference_runtime(config)
    logger = get_logger("c10_provisioning")
    return EngineCompiler(inference_runtime=runtime, logger=logger)


def build_backbone_specs(config: Config) -> tuple[BackboneSpec, ...]:
    """Materialise :class:`BackboneSpec` tuple from
    ``config.components['c10_provisioning'].backbones``.

    Resolves each :class:`BackboneConfig` ``onnx_path`` string into
    an absolute :class:`Path` (validation happened at load time via
    :meth:`BackboneConfig.__post_init__`).
    """

    block: C10ProvisioningConfig = config.components["c10_provisioning"]
    return tuple(_backbone_spec_from_config(bb) for bb in block.backbones)


def _backbone_spec_from_config(
    backbone: BackboneConfig,
) -> BackboneSpec:
    return BackboneSpec(
        model_name=backbone.model_name,
        onnx_path=Path(backbone.onnx_path),
        expected_input_shape=tuple(backbone.expected_input_shape),
        input_name=backbone.input_name,
    )


def build_manifest_builder(
    config: Config,
    *,
    tile_metadata_store: TileMetadataStore,
    clock: Clock,
) -> ManifestBuilder:
    """Construct a wired :class:`ManifestBuilder` (AZ-323).

    The ``tile_metadata_store`` argument is the AZ-303 C6 store; this
    factory wraps it in the consumer-side
    :class:`TilesByBboxQuery` adapter so the C10 module never imports
    ``components.c6_tile_cache`` directly (AZ-270 + AZ-507 boundary).

    ``clock`` is supplied explicitly rather than re-resolved through
    a clock factory because the composition root selects the clock
    strategy (WallClock for live, TlogDerivedClock for replay) per
    AZ-398 and threads the SAME instance through every consumer.
    """

    block: C10ProvisioningConfig = config.components["c10_provisioning"]
    sidecar = Sha256Sidecar()
    signer = Ed25519ManifestSigner()
    logger = get_logger("c10_provisioning.manifest")
    tiles_query = c6_tile_metadata_store_to_tiles_query(tile_metadata_store)
    return ManifestBuilder(
        sidecar=sidecar,
        signer=signer,
        tile_metadata_store=tiles_query,
        logger=logger,
        clock=clock,
        config=block.manifest,
    )


def build_manifest_verifier(
    config: Config,
    *,
    clock: Clock,
    tile_metadata_store: TileMetadataStore | None = None,
    with_tile_store: bool = False,
) -> ManifestVerifierImpl:
    """Construct a wired :class:`ManifestVerifierImpl` (AZ-324).

    ``with_tile_store=True`` (operator C12 mode) requires
    ``tile_metadata_store`` to be supplied — the verifier re-derives
    ``tiles_coverage_sha256`` from C6 and reports drift.
    ``with_tile_store=False`` (airborne C5 mode) trusts the recorded
    aggregate after the Ed25519 signature passes (MV-INV-5); the
    ``tile_metadata_store`` argument is ignored.
    """

    sidecar = Sha256Sidecar()
    logger = get_logger("c10_provisioning.verify")
    # AZ-324 silently accepting a tile_metadata_store with
    # `with_tile_store=False` would mask a composition-root mistake
    # (operator mode wired in an airborne binary by accident); we keep
    # the airborne path explicit by ignoring the argument here.
    if with_tile_store:
        if tile_metadata_store is None:
            raise ValueError(
                "build_manifest_verifier(with_tile_store=True) requires "
                "tile_metadata_store; supply None or set with_tile_store=False"
            )
        tiles_query: TilesByBboxQuery | None = c6_tile_metadata_store_to_tiles_query(
            tile_metadata_store
        )
    else:
        tiles_query = None
    return ManifestVerifierImpl(
        sidecar=sidecar,
        logger=logger,
        clock=clock,
        tile_metadata_store=tiles_query,
    )


def c6_tile_metadata_store_to_tiles_query(
    tile_metadata_store: TileMetadataStore,
) -> TilesByBboxQuery:
    """Adapt the C6 ``TileMetadataStore`` to the C10 ``TilesByBboxQuery`` cut.

    Lives in the composition root because it is the only place that
    may import both C6 and C10 (the AZ-270 lint allows
    ``runtime_root``). C6 returns ``TileMetadata`` rows; AZ-323 needs
    a ``TileHashRecord`` with ``(zoom, lat, lon, source, sha256_hex)``
    and nothing else.
    """

    from gps_denied_onboard.components.c6_tile_cache import (
        SectorClassification as C6SectorClassification,
    )

    class _C6TilesAdapter:
        def __init__(self, store: TileMetadataStore) -> None:
            self._store = store

        def query_by_bbox(
            self,
            *,
            bbox,
            zoom_levels,
            sector_class,
        ):
            c6_sector = C6SectorClassification(sector_class)
            rows = self._store.query_by_bbox(
                bbox=bbox,
                zoom_levels=zoom_levels,
                sector_class=c6_sector,
            )
            return tuple(
                TileHashRecord(
                    zoom=row.tile_id.zoom_level,
                    lat=row.tile_id.lat,
                    lon=row.tile_id.lon,
                    source=row.source.value
                    if hasattr(row.source, "value")
                    else str(row.source),
                    sha256_hex=row.content_sha256_hex,
                )
                for row in rows
            )

    return _C6TilesAdapter(tile_metadata_store)


def build_descriptor_batcher(
    config: Config,
    *,
    backbone_embedder: BackboneEmbedder,
    tile_metadata_store: TileMetadataStore,
    tile_store: TileStore,
    descriptor_index: DescriptorIndex,
    clock: Clock,
) -> DescriptorBatcher:
    """Construct a wired :class:`DescriptorBatcher` (AZ-322).

    The factory:

    1. Adapts C6's ``TileMetadataStore`` to C10's
       :class:`TilesByBboxBatchQuery` cut.
    2. Adapts C6's ``TileStore`` to C10's :class:`TilePixelOpener` cut.
    3. Adapts C6's ``DescriptorIndex`` to C10's
       :class:`DescriptorIndexRebuilder` cut.
    4. Reads the C10 batcher knobs from
       ``config.components['c10_provisioning']`` (currently defaults
       only — a dedicated config block lands when AZ-326 wires the T5
       orchestrator).

    The ``backbone_embedder`` is supplied by the operator binary
    (composition root); the most common impl is the
    :class:`C7EngineBackboneEmbedder`. Keeping it injected here
    instead of constructed inside the factory lets E-C2 (AZ-255) swap
    in its public embed API later via a one-line factory swap, per
    the AZ-322 spec § Risk-1 mitigation.
    """

    logger = get_logger("c10_provisioning.descriptor_batcher")
    return DescriptorBatcher(
        backbone_embedder=backbone_embedder,
        tiles_query=c6_tile_metadata_store_to_tiles_batch_query(
            tile_metadata_store
        ),
        tile_pixel_opener=c6_tile_store_to_pixel_opener(tile_store),
        descriptor_index=c6_descriptor_index_to_rebuilder(descriptor_index),
        clock=clock,
        logger=logger,
        config=C10BatcherConfig(),
    )


def c6_tile_metadata_store_to_tiles_batch_query(
    tile_metadata_store: TileMetadataStore,
) -> TilesByBboxBatchQuery:
    """Adapt C6 ``TileMetadataStore`` to C10's ``TilesByBboxBatchQuery``.

    C6's ``query_by_bbox`` accepts a single ``zoom`` and a ``Bbox`` DTO;
    the batcher cut takes ``zoom_levels: tuple[int, ...]`` and a 4-tuple
    bbox. This adapter loops over the zoom set and concatenates the
    results, projecting :class:`TileMetadata` rows down to the
    :class:`TileBboxRecord` shape the batcher needs (zoom + lat + lon
    + source — the rest of the metadata row is irrelevant to the
    descriptor pipeline).

    Lives in ``runtime_root`` because it is the only layer allowed to
    import both C6 and C10 (AZ-270 lint).
    """

    from gps_denied_onboard.components.c6_tile_cache import (
        Bbox as C6Bbox,
    )
    from gps_denied_onboard.components.c6_tile_cache import (
        SectorClassification as C6SectorClassification,
    )

    class _C6BatchTilesAdapter:
        def __init__(self, store: TileMetadataStore) -> None:
            self._store = store

        def query_by_bbox_batch(
            self,
            *,
            bbox: tuple[float, float, float, float],
            zoom_levels: tuple[int, ...],
            sector_class: str,
        ) -> list[TileBboxRecord]:
            # ``sector_class`` is currently a soft filter (the
            # batcher's CorpusFilter carries it to keep parity with
            # the manifest builder); C6's query_by_bbox does not
            # accept it directly, so we pre-validate the enum here
            # and let the upstream metadata classification gate
            # invalidate freshness if needed.
            C6SectorClassification(sector_class)
            min_lat, min_lon, max_lat, max_lon = bbox
            c6_bbox = C6Bbox(
                min_lat=min_lat,
                min_lon=min_lon,
                max_lat=max_lat,
                max_lon=max_lon,
            )
            records: list[TileBboxRecord] = []
            for zoom in zoom_levels:
                rows = self._store.query_by_bbox(bbox=c6_bbox, zoom=zoom)
                for row in rows:
                    source = row.source
                    source_str = (
                        source.value if hasattr(source, "value") else str(source)
                    )
                    records.append(
                        TileBboxRecord(
                            zoom=row.tile_id.zoom_level,
                            lat=row.tile_id.lat,
                            lon=row.tile_id.lon,
                            source=source_str,
                        )
                    )
            return records

    return _C6BatchTilesAdapter(tile_metadata_store)


def c6_tile_store_to_pixel_opener(
    tile_store: TileStore,
) -> TilePixelOpener:
    """Adapt C6 ``TileStore`` to C10's ``TilePixelOpener`` cut.

    The C6 contract: ``read_tile_pixels(tile_id) -> TilePixelHandle``,
    where :class:`TilePixelHandle` is itself a context manager (mmap
    handle that closes on ``__exit__``). The batcher cut: ``open_tile(zoom, lat, lon)
    -> ContextManager``. This adapter just builds a ``TileId`` and
    returns the C6 handle directly — the call shape matches because
    :class:`TilePixelHandle` already implements ``__enter__`` /
    ``__exit__``.
    """

    from gps_denied_onboard.components.c6_tile_cache import TileId

    class _C6PixelOpenerAdapter:
        def __init__(self, store: TileStore) -> None:
            self._store = store

        def open_tile(self, *, zoom: int, lat: float, lon: float) -> Any:
            tile_id = TileId(zoom_level=zoom, lat=lat, lon=lon)
            return self._store.read_tile_pixels(tile_id)

    return _C6PixelOpenerAdapter(tile_store)


def build_cache_provisioner(
    config: Config,
    *,
    engine_compiler: EngineCompiler,
    descriptor_batcher: DescriptorBatcher,
    manifest_builder: ManifestBuilder,
    tile_metadata_store: TileMetadataStore,
    host: HostCapabilities,
    precision: PrecisionMode,
    clock: Clock,
) -> CacheProvisionerImpl:
    """Construct a wired :class:`CacheProvisionerImpl` (AZ-325).

    The orchestrator is the public top-level seam C12 calls; the
    factory composes it from the already-built phase impls so the
    same engine_compiler / descriptor_batcher / manifest_builder
    instances can be reused across multiple ``build_cache_artifacts``
    invocations within an operator session.

    ``host`` + ``precision`` come from the composition root because
    AZ-321's :class:`EngineCompileRequest` expects host-info threaded
    in (the AZ-297 :class:`InferenceRuntime` does not introspect it),
    and they participate in the build-identity hash via
    :class:`EngineFilenameSchema`. Tier-1 dev workstations probe the
    GPU via :mod:`pynvml`; replay / unit tests construct fixed
    :class:`HostCapabilities` so AC-1..AC-16 are deterministic.

    The :class:`TileMetadataStore` is wrapped in the C10
    :class:`TilesByBboxQuery` cut so the orchestrator never imports
    ``components.c6_tile_cache``.
    """

    block: C10ProvisioningConfig = config.components["c10_provisioning"]
    backbones = build_backbone_specs(config)
    tiles_query = c6_tile_metadata_store_to_tiles_query(tile_metadata_store)
    logger = get_logger("c10_provisioning.provisioner")
    return CacheProvisionerImpl(
        engine_compiler=engine_compiler,
        descriptor_batcher=descriptor_batcher,
        manifest_builder=manifest_builder,
        tile_metadata_store=tiles_query,
        lock_factory=FilelockFileLockFactory(),
        backbones=backbones,
        host=host,
        precision=precision,
        workspace_mb=block.workspace_mb,
        logger=logger,
        clock=clock,
        config=block.provisioner,
    )


def c6_descriptor_index_to_rebuilder(
    descriptor_index: DescriptorIndex,
) -> DescriptorIndexRebuilder:
    """Adapt C6 ``DescriptorIndex`` to C10's ``DescriptorIndexRebuilder``.

    C6's ``rebuild_from_descriptors(descriptors, tile_ids: list[TileId],
    hnsw_params: HnswParams)`` is the AZ-303 / AZ-306 contract; the
    batcher cut ``rebuild(*, descriptors, tile_records, hnsw_*)`` is
    transport-decoupled. This adapter projects ``TileBboxRecord`` →
    ``TileId`` and folds the four HNSW kwargs into the
    :class:`HnswParams` DTO before delegating.
    """

    from gps_denied_onboard.components.c6_tile_cache import (
        HnswParams,
        TileId,
    )

    class _C6RebuilderAdapter:
        def __init__(self, index: DescriptorIndex) -> None:
            self._index = index

        def rebuild(
            self,
            *,
            descriptors,
            tile_records,
            hnsw_m,
            hnsw_ef_construction,
            hnsw_ef_search,
            hnsw_metric,
        ):
            tile_ids = [
                TileId(
                    zoom_level=record.zoom,
                    lat=record.lat,
                    lon=record.lon,
                )
                for record in tile_records
            ]
            params = HnswParams(
                m=hnsw_m,
                ef_construction=hnsw_ef_construction,
                ef_search=hnsw_ef_search,
                metric=hnsw_metric,
            )
            self._index.rebuild_from_descriptors(
                descriptors=descriptors,
                tile_ids=tile_ids,
                hnsw_params=params,
            )

    return _C6RebuilderAdapter(descriptor_index)