from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from pydantic import BaseModel, ConfigDict, Field


NotificationStatus = Literal["pending", "queued", "sending", "sent", "failed", "skipped", "cancelled"]


class NotificationCreateRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    source_module: str = Field(min_length=1, max_length=100)
    source_resource_type: str = Field(min_length=1, max_length=100)
    source_resource_id: str | None = Field(default=None, max_length=255)
    event_kind: str = Field(min_length=1, max_length=100)
    channel: str = Field(default="inbox", max_length=40)
    recipient: str | None = Field(default=None, max_length=500)
    recipient_type: str | None = Field(default=None, max_length=40)
    recipient_id: str | None = Field(default=None, max_length=255)
    recipient_label: str | None = Field(default=None, max_length=500)
    subject: str | None = Field(default=None, max_length=500)
    body_text: str | None = None
    body_html: str | None = None
    action_url: str | None = Field(default=None, max_length=1000)
    priority: int = 0
    not_before_at: datetime | None = None
    enqueue_delivery: bool = True
    payload: dict[str, Any] = Field(default_factory=dict)
    metadata: dict[str, Any] = Field(default_factory=dict)


class NotificationUpdateRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    status: Literal["read", "acknowledged", "cancelled"] | None = None
    metadata: dict[str, Any] | None = None


class NotificationDeliverPendingRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    tenant_id: str | None = Field(default=None, max_length=36)
    limit: int = Field(default=50, ge=1, le=500)


class NotificationPreferencesUpdateRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    show_unread_badge: bool | None = None
    email_enabled: bool | None = None
    email_digest_enabled: bool | None = None
    muted_source_modules: list[str] | None = None
    metadata: dict[str, Any] | None = None


class NotificationPreferencesResponse(BaseModel):
    tenant_id: str
    user_id: str
    show_unread_badge: bool = True
    email_enabled: bool = False
    email_digest_enabled: bool = False
    muted_source_modules: list[str] = Field(default_factory=list)
    metadata: dict[str, Any] = Field(default_factory=dict)


class NotificationDeliveryAttemptResponse(BaseModel):
    id: str
    notification_id: str
    attempt_no: int
    channel: str
    provider: str | None = None
    status: str
    started_at: datetime | None = None
    finished_at: datetime | None = None
    external_message_id: str | None = None
    error: str | None = None
    details: dict[str, Any] = Field(default_factory=dict)
    created_at: datetime
    updated_at: datetime


class NotificationResponse(BaseModel):
    id: str
    tenant_id: str
    source_module: str
    source_resource_type: str
    source_resource_id: str | None = None
    event_kind: str
    channel: str
    recipient: str | None = None
    recipient_type: str | None = None
    recipient_id: str | None = None
    recipient_label: str | None = None
    subject: str | None = None
    body_text: str | None = None
    body_html: str | None = None
    action_url: str | None = None
    priority: int
    status: str
    not_before_at: datetime | None = None
    queued_at: datetime | None = None
    sent_at: datetime | None = None
    failed_at: datetime | None = None
    read_at: datetime | None = None
    acknowledged_at: datetime | None = None
    cancelled_at: datetime | None = None
    attempt_count: int
    last_error: str | None = None
    external_message_id: str | None = None
    payload: dict[str, Any] = Field(default_factory=dict)
    metadata: dict[str, Any] = Field(default_factory=dict)
    attempts: list[NotificationDeliveryAttemptResponse] = Field(default_factory=list)
    created_at: datetime
    updated_at: datetime


class NotificationListResponse(BaseModel):
    notifications: list[NotificationResponse] = Field(default_factory=list)


class NotificationSummaryResponse(BaseModel):
    total: int = 0
    unread: int = 0
    pending: int = 0
    failed: int = 0
    show_unread_badge: bool = True


class NotificationDeliveryResultResponse(BaseModel):
    notification: NotificationResponse | None = None
    processed: int = 0
    sent: int = 0
    failed: int = 0
    skipped: int = 0
    errors: list[str] = Field(default_factory=list)