"""PlanData Snapshot 鉴权 API。"""
from flask import Blueprint, jsonify, request

from insurance.middleware.auth_middleware import jwt_required


plan_snapshot_bp = Blueprint("insurance_plan_snapshots", __name__)


def _response(data=None, message="success", code=0, status=200):
    return jsonify({"code": code, "message": message, "data": data}), status


def _run(action):
    from insurance.plan_data.service import SnapshotError

    try:
        return action()
    except SnapshotError as exc:
        return _response(
            {"errorCode": exc.code, **exc.data},
            exc.message,
            4201 if exc.status < 500 else 5001,
            exc.status,
        )


@plan_snapshot_bp.route("", methods=["POST"])
@jwt_required
def create_plan_snapshot():
    from insurance.plan_data.service import create_draft_from_legacy, create_snapshot

    user_id = str(getattr(request, "user_id", "guest"))
    payload = request.get_json(silent=True) or {}

    def action():
        document_id = int(payload.get("documentId") or 0)
        if isinstance(payload.get("planData"), dict):
            snapshot = create_snapshot(document_id, user_id, payload["planData"], status="draft")
        else:
            snapshot = create_draft_from_legacy(
                document_id,
                user_id,
                payload.get("extraction") or {},
                evidence_entries=payload.get("evidence") or [],
            )
        return _response(snapshot.to_public_dict(), status=201)

    return _run(action)


@plan_snapshot_bp.route("/<int:snapshot_id>", methods=["GET"])
@jwt_required
def get_plan_snapshot(snapshot_id: int):
    from insurance.plan_data.service import SnapshotError, get_owned_snapshot

    user_id = str(getattr(request, "user_id", "guest"))

    def action():
        snapshot = get_owned_snapshot(snapshot_id, user_id)
        if not snapshot:
            raise SnapshotError("SNAPSHOT_NOT_FOUND", "快照不存在", status=404)
        return _response(snapshot.to_public_dict())

    return _run(action)


@plan_snapshot_bp.route("/<int:snapshot_id>/evidence", methods=["GET"])
@jwt_required
def get_snapshot_evidence(snapshot_id: int):
    from insurance.plan_data.service import list_evidence

    user_id = str(getattr(request, "user_id", "guest"))
    field_path = str(request.args.get("fieldPath") or "").strip()
    page = max(1, request.args.get("page", 1, type=int))
    page_size = min(100, max(1, request.args.get("pageSize", 50, type=int)))
    return _run(lambda: _response(list_evidence(snapshot_id, user_id, field_path, page, page_size)))


@plan_snapshot_bp.route("/<int:snapshot_id>/draft", methods=["PATCH"])
@jwt_required
def update_snapshot_draft(snapshot_id: int):
    from insurance.plan_data.service import patch_draft

    user_id = str(getattr(request, "user_id", "guest"))
    payload = request.get_json(silent=True) or {}
    return _run(lambda: _response(patch_draft(
        snapshot_id,
        user_id,
        expected_hash=str(payload.get("expectedHash") or ""),
        changes=payload.get("changes") or [],
    ).to_public_dict()))


@plan_snapshot_bp.route("/<int:snapshot_id>/validate", methods=["POST"])
@jwt_required
def validate_plan_snapshot(snapshot_id: int):
    from insurance.plan_data.service import validate_snapshot

    user_id = str(getattr(request, "user_id", "guest"))
    return _run(lambda: _response(validate_snapshot(snapshot_id, user_id)))


@plan_snapshot_bp.route("/<int:snapshot_id>/confirm", methods=["POST"])
@jwt_required
def confirm_plan_snapshot(snapshot_id: int):
    from insurance.plan_data.service import confirm_snapshot

    user_id = str(getattr(request, "user_id", "guest"))
    return _run(lambda: _response(confirm_snapshot(snapshot_id, user_id).to_public_dict(), status=201))


@plan_snapshot_bp.route("/<int:snapshot_id>/poster-projection", methods=["GET"])
@jwt_required
def poster_projection(snapshot_id: int):
    from insurance.plan_data.projections import to_poster_projection
    from insurance.plan_data.service import SnapshotError, get_owned_snapshot

    user_id = str(getattr(request, "user_id", "guest"))

    def action():
        snapshot = get_owned_snapshot(snapshot_id, user_id)
        if not snapshot:
            raise SnapshotError("SNAPSHOT_NOT_FOUND", "快照不存在", status=404)
        if snapshot.status != "confirmed":
            raise SnapshotError("SNAPSHOT_NOT_CONFIRMED", "只有 confirmed 快照可以投影", status=422)
        return _response({
            "snapshotId": snapshot.id,
            "snapshotHash": snapshot.snapshot_hash,
            "projection": to_poster_projection(snapshot.plan_data()),
        })

    return _run(action)


@plan_snapshot_bp.route("/<int:snapshot_id>/deck-contract", methods=["GET"])
@jwt_required
def deck_contract(snapshot_id: int):
    from insurance.plan_data.projections import to_deck_contract
    from insurance.plan_data.service import SnapshotError, get_owned_snapshot

    user_id = str(getattr(request, "user_id", "guest"))

    def action():
        snapshot = get_owned_snapshot(snapshot_id, user_id)
        if not snapshot:
            raise SnapshotError("SNAPSHOT_NOT_FOUND", "快照不存在", status=404)
        if snapshot.status != "confirmed":
            raise SnapshotError("SNAPSHOT_NOT_CONFIRMED", "只有 confirmed 快照可以投影", status=422)
        return _response({
            "snapshotId": snapshot.id,
            "snapshotHash": snapshot.snapshot_hash,
            "deckContract": to_deck_contract(snapshot.plan_data(), document_sha256=snapshot.document_sha256),
        })

    return _run(action)