from ...adapters import (
    DNS_RECORDS,
    ApplyResult,
    Capability,
    CapabilityOperation,
    DiscoveredObject,
    NormalizedObject,
    PlanAction,
    PlanOperation,
)
from ...models import DesiredRecord
from ..providers.verizon import Plugin as VerizonProvider


class Plugin:
    name = "verizon"
    capabilities = frozenset(
        {
            Capability(
                DNS_RECORDS,
                CapabilityOperation.DISCOVER,
            ),
            Capability(
                DNS_RECORDS,
                CapabilityOperation.APPLY,
            ),
            Capability(
                DNS_RECORDS,
                CapabilityOperation.VERIFY,
            ),
        }
    )

    def __init__(self, config, endpoint):
        if endpoint.plugin != self.name:
            raise RuntimeError(
                "Verizon adapter requires a verizon endpoint"
            )

        self.config = config
        self.endpoint = endpoint
        self.provider = VerizonProvider(config, endpoint)

    def connect(self) -> None:
        self.provider.connect()

    def discover(
        self,
        object_type: str,
    ) -> list[DiscoveredObject]:
        if object_type != DNS_RECORDS:
            raise RuntimeError(
                f"{self.endpoint.identity} cannot discover "
                f"object type {object_type!r}"
            )

        discovered: list[DiscoveredObject] = []
        records = sorted(
            self.provider.list_records().values(),
            key=lambda record: record.hostname.lower(),
        )

        for record in records:
            slot = record.metadata.get("slot")
            if isinstance(slot, bool) or not isinstance(slot, int):
                raise RuntimeError(
                    f"Verizon DNS record {record.hostname!r} "
                    "has no valid endpoint-local slot"
                )

            discovered.append(
                DiscoveredObject(
                    object_type=DNS_RECORDS,
                    local_key=str(slot),
                    payload={
                        "hostname": record.hostname,
                        "ip": record.ip,
                        "record_type": record.record_type,
                    },
                )
            )

        return discovered

    def _desired_record(
        self,
        object: NormalizedObject,
    ) -> DesiredRecord:
        if object.object_type != DNS_RECORDS:
            raise RuntimeError(
                f"{self.endpoint.identity} cannot handle "
                f"object type {object.object_type!r}"
            )

        payload = object.payload
        hostname = str(payload.get("hostname") or "")
        if hostname != object.logical_key:
            raise RuntimeError(
                "DNS object hostname does not match its logical key"
            )

        record_type = str(
            payload.get("record_type") or ""
        ).upper()
        if record_type != "A":
            raise RuntimeError(
                f"Verizon DNS does not support {record_type!r} records"
            )

        wildcard = payload.get("wildcard") is True
        if wildcard:
            raise RuntimeError(
                "Verizon DNS does not support wildcard records"
            )

        return DesiredRecord(
            hostname=hostname,
            ip=str(payload.get("ip") or ""),
            record_type=record_type,
            wildcard=False,
        )

    def apply(self, action: PlanAction) -> ApplyResult | None:
        if action.endpoint_id != self.endpoint.identity:
            raise RuntimeError(
                "Plan action belongs to a different endpoint"
            )

        if action.operation in {
            PlanOperation.NOOP,
            PlanOperation.SKIP,
        }:
            return None

        if action.desired is None:
            raise RuntimeError(
                "Verizon apply action requires desired state"
            )

        record = self._desired_record(action.desired)

        if action.operation == PlanOperation.CREATE:
            detail = self.provider.add_record(record)
        elif action.operation == PlanOperation.UPDATE:
            detail = self.provider.update_record(record)
        else:
            raise RuntimeError(
                f"Verizon adapter does not support "
                f"{action.operation.value} actions"
            )

        records = self.provider.list_records()
        applied_record = records.get(record.hostname.lower())
        if applied_record is None:
            applied_record = records.get(record.hostname)

        if applied_record is None:
            raise RuntimeError(
                "Verizon mutation succeeded but the applied DNS "
                f"record {record.hostname!r} could not be rediscovered"
            )

        slot = applied_record.metadata.get("slot")
        if isinstance(slot, bool) or not isinstance(slot, int):
            raise RuntimeError(
                f"Verizon DNS record {record.hostname!r} "
                "has no valid endpoint-local slot after apply"
            )

        applied = NormalizedObject(
            object_type=action.desired.object_type,
            logical_key=action.desired.logical_key,
            local_key=str(slot),
            payload=dict(action.desired.payload),
            references=action.desired.references,
        )

        return ApplyResult(
            object=applied,
            detail=detail,
        )

    def verify(self, object: NormalizedObject) -> bool:
        return self.provider.verify_record(
            self._desired_record(object)
        )