"""R8 适配器：政企收入全链路穿透 / 拆单规避。

源明细：SrcContract / SrcContractApproval / SrcPayment
映射到：Entity(CONTRACT, CUSTOMER, ACCOUNT, ADDRESS, LEGAL_PERSON) + 关系 + MetricEvent
"""

from __future__ import annotations

import uuid

from sqlalchemy.orm import Session

from app.datahub.graph_repo import add_relationship, upsert_entity
from app.datahub.models import MetricEvent
from app.datahub.ontology import EntityType, RelationshipType
from app.datahub.staging import SrcContract, SrcContractApproval, SrcPayment
from app.ingest.base import BaseAdapter, IngestResult
from app.ingest.registry import register_adapter


@register_adapter
class ContractAdapter(BaseAdapter):
    """SrcContract → Entity(CONTRACT, CUSTOMER, ACCOUNT, ADDRESS, LEGAL_PERSON) + 关系。"""

    source_system = "CONTRACT"
    staging_table = "src_contract"

    def ingest(
        self,
        session: Session,
        data_version_id: uuid.UUID | None = None,
        batch_size: int = 1000,
    ) -> IngestResult:
        result = IngestResult()
        query = session.query(SrcContract)
        if data_version_id:
            query = query.filter(SrcContract.data_version_id == data_version_id)
        rows = query.limit(batch_size).all()

        for row in rows:
            try:
                # 合同实体
                contract_entity = upsert_entity(
                    session,
                    entity_type=EntityType.CONTRACT,
                    business_key=row.contract_no,
                    display_name=f"合同-{row.contract_no}",
                    attributes={
                        "amount": row.amount,
                        "sign_date": str(row.sign_date) if row.sign_date else None,
                        "approval_threshold": row.approval_threshold,
                        "approval_level": row.approval_level,
                    },
                    data_version_id=data_version_id,
                )
                result.entities.append(contract_entity)

                # 客户实体 + 签约关系
                cust_entity = upsert_entity(
                    session,
                    entity_type=EntityType.CUSTOMER,
                    business_key=row.customer_key,
                    display_name=row.customer_name,
                    data_version_id=data_version_id,
                )
                result.entities.append(cust_entity)
                rel = add_relationship(
                    session, RelationshipType.SIGNED, cust_entity, contract_entity,
                    data_version_id=data_version_id,
                )
                result.relationships.append(rel)

                # 回款账户 → Entity(ACCOUNT) + 关系 PAID_BY
                if row.pay_account:
                    acct_entity = upsert_entity(
                        session,
                        entity_type=EntityType.ACCOUNT,
                        business_key=row.pay_account,
                        data_version_id=data_version_id,
                    )
                    result.entities.append(acct_entity)
                    rel = add_relationship(
                        session, RelationshipType.PAID_BY, contract_entity, acct_entity,
                        data_version_id=data_version_id,
                    )
                    result.relationships.append(rel)

                # 注册地址
                if row.register_address:
                    addr_entity = upsert_entity(
                        session,
                        entity_type=EntityType.ADDRESS,
                        business_key=row.register_address,
                        display_name=row.register_address,
                        data_version_id=data_version_id,
                    )
                    rel = add_relationship(
                        session, RelationshipType.REGISTERED_AT, cust_entity, addr_entity,
                        data_version_id=data_version_id,
                    )
                    result.relationships.append(rel)

                # 法人
                if row.legal_person:
                    lp_entity = upsert_entity(
                        session,
                        entity_type=EntityType.LEGAL_PERSON,
                        business_key=row.legal_person,
                        display_name=row.legal_person,
                        data_version_id=data_version_id,
                    )
                    rel = add_relationship(
                        session, RelationshipType.LEGAL_REP_OF, lp_entity, cust_entity,
                        data_version_id=data_version_id,
                    )
                    result.relationships.append(rel)

                result.row_count += 1
            except Exception:
                result.error_count += 1

        return result


@register_adapter
class ContractApprovalAdapter(BaseAdapter):
    """SrcContractApproval → MetricEvent（审批时序事件）。"""

    source_system = "CONTRACT"
    staging_table = "src_contract_approval"

    def ingest(
        self,
        session: Session,
        data_version_id: uuid.UUID | None = None,
        batch_size: int = 1000,
    ) -> IngestResult:
        result = IngestResult()
        query = session.query(SrcContractApproval)
        if data_version_id:
            query = query.filter(SrcContractApproval.data_version_id == data_version_id)
        rows = query.limit(batch_size).all()

        for row in rows:
            try:
                if row.approval_time:
                    event = MetricEvent(
                        event_time=row.approval_time,
                        subject_type="contract",
                        subject_key=row.contract_no,
                        metric_name="approval_step",
                        metric_value=float(row.approval_step),
                        attributes={
                            "approver": row.approver,
                            "result": row.approval_result,
                            "remark": row.remark,
                        },
                        data_version_id=data_version_id,
                    )
                    session.add(event)
                    result.metric_events.append(event)
                result.row_count += 1
            except Exception:
                result.error_count += 1

        return result


@register_adapter
class PaymentAdapter(BaseAdapter):
    """SrcPayment → MetricEvent（回款时序事件） + 关系补强。"""

    source_system = "FIN"
    staging_table = "src_payment"

    def ingest(
        self,
        session: Session,
        data_version_id: uuid.UUID | None = None,
        batch_size: int = 1000,
    ) -> IngestResult:
        result = IngestResult()
        query = session.query(SrcPayment)
        if data_version_id:
            query = query.filter(SrcPayment.data_version_id == data_version_id)
        rows = query.limit(batch_size).all()

        for row in rows:
            try:
                if row.pay_date:
                    import datetime as dt

                    event_time = dt.datetime.combine(
                        row.pay_date, dt.time.min, tzinfo=dt.timezone.utc
                    )
                    event = MetricEvent(
                        event_time=event_time,
                        subject_type="contract",
                        subject_key=row.contract_no,
                        metric_name="payment",
                        metric_value=row.pay_amount,
                        attributes={
                            "pay_account": row.pay_account,
                            "pay_type": row.pay_type,
                            "overdue_flag": row.overdue_flag,
                        },
                        data_version_id=data_version_id,
                    )
                    session.add(event)
                    result.metric_events.append(event)

                # 强化合同→账户关系
                if row.pay_account:
                    contract_entity = upsert_entity(
                        session,
                        entity_type=EntityType.CONTRACT,
                        business_key=row.contract_no,
                        data_version_id=data_version_id,
                    )
                    acct_entity = upsert_entity(
                        session,
                        entity_type=EntityType.ACCOUNT,
                        business_key=row.pay_account,
                        data_version_id=data_version_id,
                    )
                    rel = add_relationship(
                        session, RelationshipType.PAID_BY, contract_entity, acct_entity,
                        data_version_id=data_version_id,
                    )
                    result.relationships.append(rel)

                result.row_count += 1
            except Exception:
                result.error_count += 1

        return result