"""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_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 _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,
        "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 _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 _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:
        record, created = get_ingestion_service().create_job(
            payload,
            actor_uid=_identity().get("id") or _identity().get("sub"),
        )
        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>/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=["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)