from collections.abc import Mapping, Sequence

from pydantic import BaseModel, Field

from .services.ddns import DdnsService


class ErrorResponse(BaseModel):
    detail: str = Field(examples=["not found"])


class HostnameCreateResponse(BaseModel):
    hostname: str
    status: str = Field(description="Lifecycle state. Newly generated hostnames start as pending until registered.")
    update_url: str = Field(description="Secret update URL for router DynDNS updates.")
    dashboard_url: str = Field(description="Secret dashboard URL for reading, rotating, or deleting this hostname.")
    registration_url: str = Field(
        description="Secret URL used to register the pending hostname after secrets are saved."
    )


class HostnameStatusResponse(BaseModel):
    hostname: str
    status: str
    update_url: str = Field(description="Secret update URL for router DynDNS updates.")
    dashboard_url: str = Field(description="Secret dashboard URL for reading, rotating, or deleting this hostname.")
    ipv4: str | None = None
    ipv6: str | None = None
    updated_at: str | None = None
    history: list["HostnameUpdateEvent"] = Field(default_factory=list)


class HostnameRotateUpdateResponse(BaseModel):
    hostname: str
    status: str
    update_url: str = Field(description="Secret replacement update URL for router DynDNS updates.")
    dashboard_url: str = Field(description="Secret dashboard URL for reading, rotating, or deleting this hostname.")


class HostnameUpdateEvent(BaseModel):
    hostname: str
    ipv4: str | None = None
    ipv6: str | None = None
    status: str
    detail: str
    created_at: str
    count: int = 1


class AdminHostname(BaseModel):
    hostname: str
    status: str
    ipv4: str | None = None
    ipv6: str | None = None
    updated_at: str | None = None
    created_at: str | None = None
    accepted_at: str | None = None
    disabled: bool = False


class AdminRecord(BaseModel):
    hostname: str
    ipv4: str | None = None
    ipv6: str | None = None
    updated_at: str


class AdminUpdateEvent(BaseModel):
    hostname: str
    ipv4: str | None = None
    ipv6: str | None = None
    status: str
    detail: str
    source_ip: str
    created_at: str
    count: int = 1


class AdminCleanupRun(BaseModel):
    created_at: str
    unused_accounts_deleted: int


class AdminScheduledTask(BaseModel):
    name: str
    interval_seconds: int
    next_run_at: str
    lease_owner: str | None = None
    lease_expires_at: str | None = None
    last_started_at: str | None = None
    last_finished_at: str | None = None
    last_status: str
    last_error: str
    updated_at: str


class AdminMetrics(BaseModel):
    values: dict[str, float]
    average_update_latency_ms: float


class AdminTotals(BaseModel):
    hostnames: int
    records: int
    update_events: int
    cleanup_runs: int


class AdminDashboardResponse(BaseModel):
    totals: AdminTotals
    metrics: AdminMetrics
    hostnames: list[AdminHostname]
    update_events: list[AdminUpdateEvent]
    cleanup_runs: list[AdminCleanupRun]
    scheduled_tasks: list[AdminScheduledTask]
    limit: int


class AdminHostnamesResponse(BaseModel):
    items: list[AdminHostname]
    limit: int
    offset: int
    total: int


class AdminRecordsResponse(BaseModel):
    items: list[AdminRecord]
    limit: int
    offset: int
    total: int


class AdminEventsResponse(BaseModel):
    items: list[AdminUpdateEvent]
    limit: int
    offset: int
    next_before: str | None = None
    total: int


def _create_response(service: DdnsService, account: Mapping[str, object]) -> HostnameCreateResponse:
    return HostnameCreateResponse(
        hostname=str(account["hostname"]),
        status="active" if account.get("accepted_at") else "pending",
        update_url=service.fritz_update_url(account),
        dashboard_url=service.dashboard_url(account),
        registration_url=service.registration_url(account),
    )


def _hostname_status(
    service: DdnsService,
    account: Mapping[str, object],
    history: Sequence[Mapping[str, object]] | None = None,
) -> HostnameStatusResponse:
    return HostnameStatusResponse(
        hostname=str(account["hostname"]),
        status=_account_status(account, include_disabled=False),
        update_url=service.fritz_update_url({"update_slug": str(account["update_slug"])}),
        dashboard_url=_dashboard_url(service, account),
        ipv4=_row_text(account, "ipv4"),
        ipv6=_row_text(account, "ipv6"),
        updated_at=_row_text(account, "updated_at"),
        history=[_hostname_update_event(event) for event in history or []],
    )


def _hostname_rotate_update_response(
    service: DdnsService, account: Mapping[str, object], dashboard_secret: str
) -> HostnameRotateUpdateResponse:
    return HostnameRotateUpdateResponse(
        hostname=str(account["hostname"]),
        status="active" if account.get("accepted_at") else "pending",
        update_url=service.fritz_update_url({"update_slug": str(account["update_slug"])}),
        dashboard_url=service.dashboard_url({"management_slug": dashboard_secret}),
    )


def _hostname_update_event(row: Mapping[str, object]) -> HostnameUpdateEvent:
    return HostnameUpdateEvent(
        hostname=str(row["hostname"]),
        ipv4=_row_text(row, "ipv4"),
        ipv6=_row_text(row, "ipv6"),
        status=str(row["status"]),
        detail=str(row["detail"]),
        created_at=str(row["created_at"]),
        count=_int_value(row.get("count"), 1),
    )


def _admin_hostname(account: Mapping[str, object]) -> AdminHostname:
    return AdminHostname(
        hostname=str(account["hostname"]),
        status=_account_status(account),
        ipv4=_row_text(account, "ipv4"),
        ipv6=_row_text(account, "ipv6"),
        updated_at=_row_text(account, "updated_at"),
        created_at=_row_text(account, "created_at"),
        accepted_at=_row_text(account, "accepted_at"),
        disabled=bool(account.get("disabled")),
    )


def _admin_metrics(metrics: dict[str, float]) -> AdminMetrics:
    samples = metrics.get("update_latency_samples_total", 0)
    average_latency = metrics.get("update_latency_ms_total", 0) / samples if samples else 0
    return AdminMetrics(values=metrics, average_update_latency_ms=average_latency)


def _admin_record(row: Mapping[str, object]) -> AdminRecord:
    return AdminRecord(
        hostname=str(row["hostname"]),
        ipv4=_row_text(row, "ipv4"),
        ipv6=_row_text(row, "ipv6"),
        updated_at=str(row["updated_at"]),
    )


def _admin_update_event(row: Mapping[str, object]) -> AdminUpdateEvent:
    return AdminUpdateEvent(
        hostname=str(row["hostname"]),
        ipv4=_row_text(row, "ipv4"),
        ipv6=_row_text(row, "ipv6"),
        status=str(row["status"]),
        detail=str(row["detail"]),
        source_ip=str(row["source_ip"]),
        created_at=str(row["created_at"]),
        count=_int_value(row.get("count"), 1),
    )


def _admin_cleanup_run(row: Mapping[str, object]) -> AdminCleanupRun:
    return AdminCleanupRun(
        created_at=str(row["created_at"]),
        unused_accounts_deleted=_int_value(row["unused_accounts_deleted"], 0),
    )


def _admin_scheduled_task(row: Mapping[str, object]) -> AdminScheduledTask:
    return AdminScheduledTask(
        name=str(row["name"]),
        interval_seconds=_int_value(row["interval_seconds"], 0),
        next_run_at=str(row["next_run_at"]),
        lease_owner=_row_text(row, "lease_owner"),
        lease_expires_at=_row_text(row, "lease_expires_at"),
        last_started_at=_row_text(row, "last_started_at"),
        last_finished_at=_row_text(row, "last_finished_at"),
        last_status=str(row["last_status"]),
        last_error=str(row["last_error"]),
        updated_at=str(row["updated_at"]),
    )


def _row_text(row: Mapping[str, object], key: str) -> str | None:
    value = row.get(key)
    return str(value) if value else None


def _account_status(account: Mapping[str, object], *, include_disabled: bool = True) -> str:
    if include_disabled and account.get("disabled"):
        return "disabled"
    if account.get("accepted_at"):
        return "active"
    return "pending"


def _dashboard_url(service: DdnsService, account: Mapping[str, object]) -> str:
    management_slug = _row_text(account, "management_slug")
    if management_slug is None:
        return ""
    return service.dashboard_url({"management_slug": management_slug})


def _int_value(value: object, default: int) -> int:
    if value is None:
        return default
    if isinstance(value, int):
        return value
    if isinstance(value, float):
        return int(value)
    if isinstance(value, str):
        return int(value)
    return default