"""
DI container — constructs every dependency ONCE at app startup and
wires services together.  This is the composition root.

No globals: the container is created in `create_app()` and stored on
`app.state.container`.  Route handlers retrieve it via the `get_container`
FastAPI dependency.
"""

from __future__ import annotations

from dataclasses import dataclass

from config.settings import Settings, DATA_DIR, GALLERY_DIR, UPLOADS_DIR, JOBS_DIR
from confidence.engine import ConfidenceEngine
from confidence.conflicts import ConflictDetector
from metrics.collector import MetricsCollector
from orchestrator.health import HealthMonitor
from orchestrator.runner import Orchestrator
from pipeline import (
    InputValidator,
    ImagePreprocessor,
    ImageHasher,
    FeatureExtractor,
)
from providers.registry import ProviderRegistry
from services.analysis_service import AnalysisService
from services.cache_service import CacheService
from services.detection_service import DetectionService
from services.export_service import ExportService
from services.face_index_service import FaceIndexService
from services.face_intelligence_service import FaceIntelligenceService
from services.forensic_metadata_service import ForensicMetadataService
from services.health_service import HealthService
from services.job_service import JobService
from services.location_intelligence_service import LocationIntelligenceService
from services.object_intelligence_service import ObjectIntelligenceService
from services.osint_service import OSINTService
from services.correlation_engine_service import CorrelationEngineService
from services.provider_service import ProviderService
from services.recognition_service import RecognitionService
from services.search_service import SearchService
from storage.artifacts import ArtifactStore
from storage.cache import Cache
from storage.database import Database
from storage.face_index import FaceIndex
from storage.reference_store import ReferenceStore


@dataclass
class ServiceContainer:
    """Holds every wired service + infrastructure object."""
    settings: Settings
    registry: ProviderRegistry
    cache: Cache
    database: Database
    artifacts: ArtifactStore
    reference_store: ReferenceStore
    metrics: MetricsCollector
    health_monitor: HealthMonitor
    orchestrator: Orchestrator
    confidence_engine: ConfidenceEngine
    conflict_detector: ConflictDetector
    validator: InputValidator
    preprocessor: ImagePreprocessor
    hasher: ImageHasher
    feature_extractor: FeatureExtractor
    detection_service: DetectionService
    recognition_service: RecognitionService
    search_service: SearchService
    analysis_service: AnalysisService
    job_service: JobService
    osint_service: OSINTService
    face_intelligence_service: FaceIntelligenceService
    forensic_metadata_service: ForensicMetadataService
    object_intelligence_service: ObjectIntelligenceService
    location_intelligence_service: LocationIntelligenceService
    correlation_engine_service: CorrelationEngineService
    provider_service: ProviderService
    cache_service: CacheService
    health_service: HealthService
    export_service: ExportService
    face_index: FaceIndex
    face_index_service: FaceIndexService


def build_container(settings: Settings | None = None) -> ServiceContainer:
    """Construct the entire dependency graph.  Called once at startup."""
    settings = settings or Settings()

    # Infrastructure
    registry = ProviderRegistry(settings)
    registry.discover()

    cache = Cache(
        ttl_seconds=settings.cache_ttl_seconds,
        max_entries=settings.cache_max_entries,
    )
    database = Database(path=settings.db_path)
    artifacts = ArtifactStore(root=UPLOADS_DIR)
    reference_store = ReferenceStore(root=GALLERY_DIR)

    metrics = MetricsCollector(
        failure_threshold=settings.circuit_breaker_failure_threshold,
        recovery_seconds=settings.circuit_breaker_recovery_seconds,
    )
    health_monitor = HealthMonitor(metrics=metrics.health)

    orchestrator = Orchestrator(
        registry=registry,
        cache=cache,
        metrics=metrics,
        health=health_monitor,
        settings=settings,
    )

    confidence_engine = ConfidenceEngine()
    conflict_detector = ConflictDetector()

    # Pipeline
    validator = InputValidator(max_bytes=settings.max_image_bytes)
    preprocessor = ImagePreprocessor(max_dim=1024)
    hasher = ImageHasher()
    # Use the first available detection provider as the default feature extractor
    from models.providers import ProviderCapability
    detectors = registry.list_by_capability(ProviderCapability.DETECTION)
    default_detector = detectors[0] if detectors else None
    feature_extractor = FeatureExtractor(detector=default_detector)

    # Services
    detection_service = DetectionService(
        registry=registry, orchestrator=orchestrator, cache=cache, metrics=metrics,
        validator=validator, preprocessor=preprocessor, hasher=hasher,
        feature_extractor=feature_extractor,
        confidence_engine=confidence_engine, conflict_detector=conflict_detector,
    )
    recognition_service = RecognitionService(
        orchestrator=orchestrator, metrics=metrics,
        validator=validator, preprocessor=preprocessor, hasher=hasher,
        feature_extractor=feature_extractor, reference_store=reference_store,
        confidence_engine=confidence_engine, conflict_detector=conflict_detector,
    )
    search_service = SearchService(
        orchestrator=orchestrator, metrics=metrics,
        validator=validator, preprocessor=preprocessor, hasher=hasher,
        feature_extractor=feature_extractor,
        confidence_engine=confidence_engine, conflict_detector=conflict_detector,
    )
    analysis_service = AnalysisService(
        orchestrator=orchestrator, metrics=metrics,
        validator=validator, preprocessor=preprocessor, hasher=hasher,
        feature_extractor=feature_extractor,
        confidence_engine=confidence_engine, conflict_detector=conflict_detector,
    )
    job_service = JobService(
        detection=detection_service,
        recognition=recognition_service,
        search=search_service,
        analysis=analysis_service,
        database=database,
        metrics=metrics,
        job_timeout_seconds=settings.job_timeout_seconds,
    )
    osint_service = OSINTService(
        orchestrator=orchestrator,
        metrics=metrics,
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
        feature_extractor=feature_extractor,
    )
    face_intelligence_service = FaceIntelligenceService(
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
        feature_extractor=feature_extractor,
    )
    forensic_metadata_service = ForensicMetadataService(
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
    )
    object_intelligence_service = ObjectIntelligenceService(
        orchestrator=orchestrator,
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
        feature_extractor=feature_extractor,
    )
    location_intelligence_service = LocationIntelligenceService(
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
    )
    correlation_engine_service = CorrelationEngineService(
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
    )
    provider_service = ProviderService(registry=registry)
    cache_service = CacheService(cache=cache)
    health_service = HealthService(
        registry=registry, health_monitor=health_monitor, metrics=metrics,
        version=settings.app_version,
    )
    export_service = ExportService(database=database)

    # Reverse face search index (sqlite-vec backed)
    face_index = FaceIndex(path=settings.face_index_path)
    face_index_service = FaceIndexService(
        settings=settings,
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
        feature_extractor=feature_extractor,
        face_index=face_index,
    )

    return ServiceContainer(
        settings=settings,
        registry=registry,
        cache=cache,
        database=database,
        artifacts=artifacts,
        reference_store=reference_store,
        metrics=metrics,
        health_monitor=health_monitor,
        orchestrator=orchestrator,
        confidence_engine=confidence_engine,
        conflict_detector=conflict_detector,
        validator=validator,
        preprocessor=preprocessor,
        hasher=hasher,
        feature_extractor=feature_extractor,
        detection_service=detection_service,
        recognition_service=recognition_service,
        search_service=search_service,
        analysis_service=analysis_service,
        job_service=job_service,
        osint_service=osint_service,
        face_intelligence_service=face_intelligence_service,
        forensic_metadata_service=forensic_metadata_service,
        object_intelligence_service=object_intelligence_service,
        location_intelligence_service=location_intelligence_service,
        correlation_engine_service=correlation_engine_service,
        provider_service=provider_service,
        cache_service=cache_service,
        health_service=health_service,
        export_service=export_service,
        face_index=face_index,
        face_index_service=face_index_service,
    )