"""HTTP orchestration boundary for data-research ingestion jobs."""

from __future__ import annotations

import io
import logging

from flask import current_app, g, jsonify, request, send_file

from app import db
from app.api.data_development import bp
from app.core.data_research.errors import DataResearchError
from app.models.result import failed, success


logger = logging.getLogger(__name__)


def get_ingestion_service():
    from app.core.data_research.ingestion import IngestionService
    from app.core.data_research.repository import SqlAlchemyIngestionJobRepository

    return IngestionService(
        SqlAlchemyIngestionJobRepository(db.session),
        commit=db.session.commit,
        rollback=db.session.rollback,
    )


def get_database_source_registration_service():
    from app.core.data_research.repository import (
        SqlAlchemyIngestionSourceRepository,
    )
    from app.core.data_research.sources import (
        DatabaseSourceRegistrationService,
    )
    from app.core.data_source.runtime import get_data_source_manager

    manager = get_data_source_manager()
    return DatabaseSourceRegistrationService(
        SqlAlchemyIngestionSourceRepository(db.session),
        definition_resolver=manager.definitions.get,
        commit=db.session.commit,
        rollback=db.session.rollback,
    )


def get_catalog_snapshot_repository():
    from app.core.data_research.repository import (
        SqlAlchemyCatalogSnapshotRepository,
    )

    return SqlAlchemyCatalogSnapshotRepository(db.session)


def get_catalog_ingestion_executor():
    from app.core.data_research.catalog.execution import (
        CatalogIngestionExecutor,
    )
    from app.core.data_research.catalog.mysql import MySqlCatalogCollector
    from app.core.data_research.catalog.postgresql import (
        PostgreSqlCatalogCollector,
    )
    from app.core.data_research.catalog.service import CatalogCollectionService
    from app.core.data_research.errors import IngestionSourceInvalid
    from app.core.data_source.runtime import get_data_source_manager

    manager = get_data_source_manager()

    def collector_resolver(database_type):
        if database_type == "postgresql":
            return PostgreSqlCatalogCollector()
        if database_type == "mysql":
            return MySqlCatalogCollector()
        raise IngestionSourceInvalid(
            f"database type {database_type} is not supported"
        )

    collector = CatalogCollectionService(
        manager,
        definition_resolver=manager.definitions.get,
        collector_resolver=collector_resolver,
    )
    return CatalogIngestionExecutor(
        get_ingestion_service(),
        collector,
        get_catalog_snapshot_repository(),
        commit=db.session.commit,
        rollback=db.session.rollback,
    )


def get_data_element_service():
    from app.core.data_research.data_elements import DataElementService
    from app.core.data_research.repository import SqlAlchemyDataElementRepository
    from app.core.events.outbox import enqueue_outbox

    return DataElementService(
        SqlAlchemyDataElementRepository(db.session),
        outbox_enqueue=lambda **event: enqueue_outbox(db.session, **event),
    )


def get_candidate_decision_service():
    from app.core.data_research.candidate_decisions import CandidateDecisionService
    from app.core.data_research.data_elements import DataElementService
    from app.core.data_research.repository import (
        SqlAlchemyCandidateDecisionRepository,
        SqlAlchemyDataElementRepository,
    )

    return CandidateDecisionService(
        SqlAlchemyCandidateDecisionRepository(db.session),
        data_elements=DataElementService(SqlAlchemyDataElementRepository(db.session)),
    )


def _artifact_storage():
    from minio import Minio

    from app.core.data_research.artifacts import MinioArtifactStorage

    client = Minio(
        current_app.config["MINIO_HOST"],
        access_key=current_app.config["MINIO_USER"],
        secret_key=current_app.config["MINIO_PASSWORD"],
        secure=bool(current_app.config.get("MINIO_SECURE")),
    )
    return MinioArtifactStorage(client, current_app.config["MINIO_BUCKET"])


def get_artifact_service():
    from app.core.common.identifiers import new_governance_uid
    from app.core.data_research.artifacts import (
        ArtifactService,
        SqlAlchemyArtifactRepository,
    )
    from app.core.data_research.file_policy import FilePolicy

    return ArtifactService(
        SqlAlchemyArtifactRepository(db.session),
        _artifact_storage(),
        FilePolicy(
            max_bytes=int(current_app.config.get("DATA_RESEARCH_FILE_MAX_BYTES", 25 * 1024 * 1024)),
            max_pages=int(current_app.config.get("DATA_RESEARCH_FILE_MAX_PAGES", 500)),
        ),
        uid_factory=new_governance_uid,
    )


def get_evidence_service():
    from app.core.data_research.artifacts import EvidenceService

    return EvidenceService(db.session, _artifact_storage())


def get_ontology_service():
    from app.core.data_research.ontology.publication import (
        OntologyApplicationService,
        OntologyPublicationService,
    )
    from app.core.data_research.ontology.repository import SqlAlchemyOntologyRepository
    from app.core.events.outbox import enqueue_outbox

    repository = SqlAlchemyOntologyRepository(db.session)
    publication = OntologyPublicationService(
        repository,
        outbox_enqueue=lambda **event: enqueue_outbox(db.session, **event),
        commit=db.session.commit,
        rollback=db.session.rollback,
    )
    return OntologyApplicationService(
        repository,
        publication=publication,
        commit=db.session.commit,
        rollback=db.session.rollback,
    )


def get_ontology_dynamic_service():
    from app.core.data_research.ontology.change_sets import (
        SqlAlchemyDynamicOntologyService,
    )

    return SqlAlchemyDynamicOntologyService(db.session)


def get_ontology_exchange_service():
    from app.core.data_research.ontology.exchange import OntologyExchangeService
    from app.core.data_research.ontology.repository import SqlAlchemyOntologyRepository

    return OntologyExchangeService(
        SqlAlchemyOntologyRepository(db.session),
        commit=db.session.commit,
        rollback=db.session.rollback,
    )


def get_semantic_query_service():
    from app.core.data_research.ontology.query import (
        Neo4jSemanticRepository,
        SemanticQueryService,
    )
    from app.services.neo4j_driver import neo4j_driver

    return SemanticQueryService(Neo4jSemanticRepository(neo4j_driver))


def _identity():
    return getattr(g, "current_user", {}) or {}


def _record(record):
    return {
        "uid": str(record.uid),
        "source_uid": str(record.source_uid),
        "artifact_uid": str(record.artifact_uid) if record.artifact_uid else None,
        "job_type": record.job_type,
        "parser_version": record.parser_version,
        "status": record.status,
        "parameters": dict(record.parameters or {}),
        "statistics": dict(record.statistics or {}),
        "last_error": record.last_error,
        "attempt_count": int(record.attempt_count or 0),
        "failure_stage": record.failure_stage,
        "actor_uid": record.actor_uid,
        "created_at": record.created_at.isoformat() if record.created_at else None,
        "updated_at": record.updated_at.isoformat() if record.updated_at else None,
        "started_at": record.started_at.isoformat() if record.started_at else None,
        "finished_at": record.finished_at.isoformat() if record.finished_at else None,
    }


def _catalog_snapshot(record):
    return {
        "uid": str(record.uid),
        "job_uid": str(record.job_uid),
        "source_uid": str(record.source_uid),
        "attempt": int(record.attempt),
        "database_type": record.database_type,
        "content_hash": record.content_hash,
        "snapshot": dict(record.snapshot or {}),
        "evidence_count": int(record.evidence_count),
        "created_at": (
            record.created_at.isoformat()
            if record.created_at
            else None
        ),
    }


def _element(record):
    return {
        "uid": str(record.uid),
        "code": record.code,
        "status": record.status,
        "current_version": int(record.current_version),
        "snapshot": dict(record.snapshot or {}),
        "created_by": record.created_by,
        "updated_by": record.updated_by,
    }


def _decision(record):
    return {
        "uid": str(record.uid),
        "candidate_uid": str(record.candidate_uid),
        "action": record.action,
        "data_element_uid": (
            str(record.data_element_uid) if record.data_element_uid else None
        ),
        "evidence_uids": list(record.evidence_uids),
        "actor_uid": record.actor_uid,
        "reason": record.reason,
    }


def _artifact(record):
    return {
        "uid": str(record.uid),
        "source_uid": str(record.source_uid),
        "filename": record.filename,
        "media_type": record.media_type,
        "size_bytes": int(record.size_bytes),
        "content_hash": record.content_hash,
        "parser_version": record.parser_version,
    }


def _ontology(record):
    return {
        "uid": str(record.uid),
        "code": record.code,
        "name": record.name,
        "owner_uid": record.owner_uid,
        "status": record.status,
        "draft_revision": int(record.draft_revision),
        "active_version_uid": record.active_version_uid,
        "domain_links": [
            {"domain_uid": link.domain_uid, "role": link.role}
            for link in record.domain_links
        ],
    }


def _ontology_version(record):
    return {
        "uid": str(record.uid),
        "ontology_uid": str(record.ontology_uid),
        "version": int(record.version),
        "parent_version_uid": record.parent_version_uid,
        "status": record.status,
        "content_hash": record.content_hash,
        "graph_document": record.graph_document.to_dict(),
        "created_by": record.created_by,
    }


def _error(error):
    if isinstance(error, DataResearchError):
        return (
            jsonify(
                failed(
                    str(error),
                    code=error.http_status,
                    error={"code": error.code},
                )
            ),
            error.http_status,
        )
    logger.exception("data-research ingestion request failed")
    return (
        jsonify(
            failed(
                "数据采集任务处理失败",
                code=500,
                error={"code": "DATA_RESEARCH_ERROR"},
            )
        ),
        500,
    )


@bp.route("/ingestion-jobs", methods=["POST"])
def create_ingestion_job():
    payload = request.get_json(silent=True) or {}
    try:
        actor_uid = _identity().get("id") or _identity().get("sub")
        if payload.get("job_type") == "catalog_collect":
            get_database_source_registration_service().ensure(
                payload.get("source_uid"),
                actor_uid=actor_uid,
            )
        record, created = get_ingestion_service().create_job(
            payload,
            actor_uid=actor_uid,
        )
        return jsonify(success(_record(record))), 201 if created else 200
    except Exception as error:
        return _error(error)


@bp.route("/ingestion-jobs", methods=["GET"])
def list_ingestion_jobs():
    filters = {
        name: request.args.get(name)
        for name in ("status", "source_uid")
        if request.args.get(name)
    }
    try:
        records = get_ingestion_service().list_jobs(filters)
        return jsonify(
            success({"records": [_record(item) for item in records], "total": len(records)})
        ), 200
    except Exception as error:
        return _error(error)


@bp.route("/ingestion-jobs/<job_uid>", methods=["GET"])
def get_ingestion_job(job_uid):
    try:
        return jsonify(success(_record(get_ingestion_service().get_job(job_uid)))), 200
    except Exception as error:
        return _error(error)


@bp.route("/ingestion-jobs/<job_uid>/execute", methods=["POST"])
def execute_ingestion_job(job_uid):
    try:
        record = get_catalog_ingestion_executor().execute(job_uid)
        return jsonify(success(_record(record))), 200
    except Exception as error:
        return _error(error)


@bp.route(
    "/ingestion-jobs/<job_uid>/catalog-snapshots",
    methods=["GET"],
)
def list_catalog_snapshots(job_uid):
    try:
        records = get_catalog_snapshot_repository().list(job_uid)
        return jsonify(
            success(
                {
                    "records": [
                        _catalog_snapshot(record)
                        for record in records
                    ],
                    "total": len(records),
                }
            )
        ), 200
    except Exception as error:
        return _error(error)


@bp.route("/ingestion-jobs/<job_uid>/evidence", methods=["GET"])
def list_ingestion_job_evidence(job_uid):
    try:
        records = get_evidence_service().list_for_job(job_uid)
        return jsonify(
            success({"records": records, "total": len(records)})
        ), 200
    except Exception as error:
        return _error(error)


@bp.route("/ingestion-jobs/<job_uid>/retry", methods=["POST"])
def retry_ingestion_job(job_uid):
    try:
        return jsonify(success(_record(get_ingestion_service().retry(job_uid)))), 200
    except Exception as error:
        return _error(error)


@bp.route("/ingestion-jobs/<job_uid>/cancel", methods=["POST"])
def cancel_ingestion_job(job_uid):
    try:
        service = get_ingestion_service()
        record = service.get_job(job_uid)
        identity = _identity()
        permissions = set(identity.get("permissions") or [])
        actor_uid = identity.get("id") or identity.get("sub")
        if record.actor_uid != actor_uid and "ingestion:admin" not in permissions:
            return jsonify(failed("权限不足", code=403)), 403
        return jsonify(success(_record(service.cancel(job_uid)))), 200
    except Exception as error:
        return _error(error)


@bp.route("/data-elements", methods=["GET"])
def list_data_elements():
    try:
        records = get_data_element_service().list(
            status=request.args.get("status"),
            business_domain_uid=request.args.get("business_domain_uid"),
        )
        return jsonify(
            success(
                {
                    "records": [_element(item) for item in records],
                    "total": len(records),
                }
            )
        ), 200
    except Exception as error:
        return _error(error)


@bp.route("/data-elements", methods=["POST"])
def create_data_element():
    try:
        record = get_data_element_service().create_draft(
            request.get_json(silent=True) or {},
            actor_uid=_identity().get("id") or _identity().get("sub"),
        )
        db.session.commit()
        return jsonify(success(_element(record))), 201
    except Exception as error:
        db.session.rollback()
        return _error(error)


@bp.route("/data-elements/<element_uid>/transitions", methods=["POST"])
def transition_data_element(element_uid):
    payload = request.get_json(silent=True) or {}
    identity = _identity()
    target_status = str(payload.get("target_status") or "")
    if (
        target_status in {"published", "deprecated", "retired"}
        and "data-elements:publish" not in set(identity.get("permissions") or [])
    ):
        return jsonify(failed("权限不足", code=403)), 403
    try:
        record = get_data_element_service().transition(
            element_uid,
            target_status,
            expected_version=int(payload.get("expected_version")),
            actor_uid=identity.get("id") or identity.get("sub"),
        )
        db.session.commit()
        return jsonify(success(_element(record))), 200
    except Exception as error:
        db.session.rollback()
        return _error(error)


@bp.route("/candidate-decisions", methods=["POST"])
def decide_candidates():
    payload = request.get_json(silent=True) or {}
    try:
        records = get_candidate_decision_service().decide(
            payload.get("decisions") or [],
            actor_uid=_identity().get("id") or _identity().get("sub"),
        )
        return jsonify(success([_decision(record) for record in records])), 200
    except Exception as error:
        return _error(error)


@bp.route("/sources/files", methods=["POST"])
def upload_source_file():
    uploaded = request.files.get("file")
    if uploaded is None:
        return jsonify(failed("缺少上传文件", code=400)), 400
    try:
        record, created = get_artifact_service().store(
            request.form.get("source_uid"),
            uploaded.filename,
            uploaded.mimetype,
            uploaded.read(),
            request.form.get("parser_version") or "auto-v1",
        )
        db.session.commit()
        return jsonify(success(_artifact(record))), 201 if created else 200
    except Exception as error:
        db.session.rollback()
        return _error(error)


@bp.route("/evidence/<evidence_uid>", methods=["GET"])
def get_evidence(evidence_uid):
    identity = _identity()
    try:
        service = get_evidence_service()
        if request.args.get("download") in {"1", "true", "yes"}:
            if "evidence:download" not in set(identity.get("permissions") or []):
                return jsonify(failed("权限不足", code=403)), 403
            content, filename, media_type = service.download(evidence_uid)
            return send_file(
                io.BytesIO(content),
                mimetype=media_type,
                as_attachment=True,
                download_name=filename,
            )
        preview = service.preview(evidence_uid)
        from app.core.data_research.artifacts import redact_excerpt

        preview["excerpt"] = redact_excerpt(preview.get("excerpt"))
        return jsonify(success(preview)), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies", methods=["GET"])
def list_ontologies():
    try:
        return jsonify(success([_ontology(item) for item in get_ontology_service().list()])), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies", methods=["POST"])
def create_ontology():
    try:
        record = get_ontology_service().create(
            request.get_json(silent=True) or {},
            _identity().get("id") or _identity().get("sub"),
        )
        return jsonify(success(_ontology(record))), 201
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>", methods=["GET"])
def get_ontology(ontology_uid):
    try:
        return jsonify(success(_ontology(get_ontology_service().get(ontology_uid)))), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/versions", methods=["GET"])
def list_ontology_versions(ontology_uid):
    try:
        return jsonify(
            success(
                [
                    _ontology_version(item)
                    for item in get_ontology_service().list_versions(ontology_uid)
                ]
            )
        ), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/graph", methods=["GET"])
def get_ontology_graph(ontology_uid):
    try:
        service = get_ontology_service()
        ontology = service.get(ontology_uid)
        version = service.latest_version(ontology_uid)
        data = (
            _ontology_version(version)
            if version is not None
            else {
                "uid": None,
                "ontology_uid": str(ontology_uid),
                "version": 0,
                "parent_version_uid": None,
                "status": "draft",
                "content_hash": None,
                "graph_document": {
                    name: []
                    for name in (
                        "classes",
                        "properties",
                        "relations",
                        "constraints",
                        "domain_links",
                        "element_mappings",
                    )
                },
                "created_by": None,
            }
        )
        response = jsonify(success(data))
        response.headers["ETag"] = f'"{int(ontology.draft_revision)}"'
        return response, 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/graph", methods=["PATCH"])
def save_ontology_graph(ontology_uid):
    etag = str(request.headers.get("If-Match") or "").strip().strip('"')
    if not etag.isdigit():
        return jsonify(failed("缺少有效 If-Match 修订号", code=428)), 428
    try:
        version = get_ontology_service().save_draft(
            ontology_uid,
            request.get_json(silent=True) or {},
            int(etag),
            _identity().get("id") or _identity().get("sub"),
        )
        response = jsonify(success(_ontology_version(version)))
        response.headers["ETag"] = f'"{int(etag) + 1}"'
        return response, 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/validate", methods=["POST"])
def validate_ontology(ontology_uid):
    try:
        issues = get_ontology_service().validate(ontology_uid)
        data = [
            {"code": item.code, "message": item.message, "path": item.path}
            for item in issues
        ]
        return jsonify(success(data)), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/publish", methods=["POST"])
def publish_ontology(ontology_uid):
    try:
        version = get_ontology_service().publish(
            ontology_uid,
            request.headers.get("Idempotency-Key") or f"{ontology_uid}:publish",
            _identity().get("id") or _identity().get("sub"),
        )
        return jsonify(success(_ontology_version(version))), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/diff", methods=["GET"])
def diff_ontology(ontology_uid):
    try:
        return jsonify(success(get_ontology_service().diff(
            ontology_uid, request.args.get("left"), request.args.get("right")
        ))), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/rollback", methods=["POST"])
def rollback_ontology(ontology_uid):
    payload = request.get_json(silent=True) or {}
    try:
        version = get_ontology_service().rollback(
            ontology_uid,
            payload.get("target_version_uid"),
            int(payload.get("expected_revision")),
            _identity().get("id") or _identity().get("sub"),
        )
        return jsonify(success(_ontology_version(version))), 201
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/suggestions", methods=["POST"])
def generate_ontology_suggestions(ontology_uid):
    try:
        result = get_ontology_dynamic_service().generate(
            ontology_uid,
            request.get_json(silent=True) or {},
            _identity().get("id") or _identity().get("sub"),
        )
        records = (
            result.get("suggestions") or []
            if isinstance(result, dict)
            else result
        )
        suggestions = [
            item
            if isinstance(item, dict)
            else {
                "uid": item.uid,
                "kind": item.kind,
                "payload": item.payload,
                "evidence_uids": list(item.evidence_uids),
                "confidence": item.confidence,
                "source": item.source,
                "model_version": item.model_version,
                "prompt_version": item.prompt_version,
            }
            for item in records
        ]
        data = {
            "change_set_uid": (
                result.get("change_set_uid")
                if isinstance(result, dict)
                else None
            ),
            "suggestions": suggestions,
        }
        return jsonify(success(data)), 201
    except Exception as error:
        return _error(error)


@bp.route(
    "/ontologies/<ontology_uid>/change-sets/<change_set_uid>/decisions",
    methods=["POST"],
)
def decide_ontology_change_set(ontology_uid, change_set_uid):
    payload = request.get_json(silent=True) or {}
    try:
        result = get_ontology_dynamic_service().decide(
            ontology_uid,
            change_set_uid,
            payload.get("decisions") or [],
            _identity().get("id") or _identity().get("sub"),
        )
        return jsonify(success(result)), 200
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/<ontology_uid>/export", methods=["GET"])
def export_ontology(ontology_uid):
    try:
        content, media_type, filename = get_ontology_exchange_service().export(
            ontology_uid, request.args.get("format") or "json"
        )
        return send_file(
            io.BytesIO(content),
            mimetype=media_type,
            as_attachment=True,
            download_name=filename,
        )
    except Exception as error:
        return _error(error)


@bp.route("/ontologies/import", methods=["POST"])
def import_ontology():
    try:
        uploaded = request.files.get("file")
        content = uploaded.read() if uploaded is not None else request.get_data(cache=False)
        result = get_ontology_exchange_service().import_document(
            content,
            request.args.get("format") or "json",
            _identity().get("id") or _identity().get("sub"),
        )
        return jsonify(success(result)), 201
    except Exception as error:
        return _error(error)


@bp.route("/semantic/properties/<property_uid>", methods=["GET"])
def query_semantic_property(property_uid):
    domain = str(request.args.get("business_domain_uid") or "").strip()
    identity = _identity()
    scoped = set(identity.get("business_domains") or [domain])
    if "*" not in scoped and domain not in scoped:
        return jsonify(failed("权限不足", code=403)), 403
    try:
        result = get_semantic_query_service().trace_property(
            property_uid,
            allowed_domains={domain},
            limit=int(request.args.get("limit") or 20),
            after_uid=request.args.get("after_uid"),
        )
        return jsonify(success(result)), 200
    except Exception as error:
        return _error(error)