"""Observability & Audit domain: the immutable trail of who did what."""

from __future__ import annotations

from dataclasses import dataclass, field
from datetime import datetime

from app.domain.base import new_id, utcnow


class AuditAction:
    """Well-known auditable actions. Free-form strings are allowed but these are
    the ones the application layer emits so far."""

    LOGIN = "auth.login"
    LOGOUT = "auth.logout"
    SIGNUP = "auth.signup"
    ORG_CREATE = "organization.create"
    ORG_DELETE = "organization.delete"
    MEMBER_INVITE = "member.invite"
    #: An invited user redeemed their token and joined the organization.
    MEMBER_JOIN = "member.join"
    MEMBER_ROLE_CHANGE = "member.role_change"
    MEMBER_REMOVE = "member.remove"
    EMPLOYEE_CREATE = "employee.create"
    EMPLOYEE_UPDATE = "employee.update"
    REPO_CREATE = "repo.create"
    REPO_DELETE = "repo.delete"
    DOMAIN_CREATE = "domain.create"
    DOMAIN_DELETE = "domain.delete"
    SANDBOX_COMMAND = "sandbox.command"
    SANDBOX_DESTROY = "sandbox.destroy"
    #: A platform worker stopped a sandbox session that had gone idle. System
    #: action, not a tenant one — the actor is the platform, not a user.
    SANDBOX_REAP = "sandbox.reap"
    APPROVAL_DECISION = "approval.decision"
    BILLING_CREDIT = "billing.credit"
    BILLING_PAYMENT = "billing.payment"
    PROVIDER_CHANGE = "provider.change"
    MODEL_CHANGE = "model.change"
    ROUTING_CHANGE = "routing.change"
    PROJECT_CREATE = "project.create"
    PROJECT_DELETE = "project.delete"
    TASK_CREATE = "task.create"
    RUN_CANCEL = "run.cancel"
    #: A platform owner triaged an error in the console. Auditable so "who
    #: decided this bug was fixed?" has an answer.
    ERROR_RESOLVE = "error.resolve"


@dataclass(slots=True, kw_only=True)
class AuditEvent:
    action: str
    organization_id: str | None = None
    actor_user_id: str | None = None
    target_type: str = ""
    target_id: str = ""
    metadata_json: dict = field(default_factory=dict)
    ip_address: str = ""
    user_agent: str = ""
    id: str = field(default_factory=new_id)
    created_at: datetime = field(default_factory=utcnow)


@dataclass(slots=True, kw_only=True)
class Trace:
    organization_id: str
    name: str = ""
    run_id: str | None = None
    id: str = field(default_factory=new_id)
    created_at: datetime = field(default_factory=utcnow)


@dataclass(slots=True, kw_only=True)
class Span:
    trace_id: str
    name: str
    kind: str = "internal"
    parent_span_id: str | None = None
    attributes_json: dict = field(default_factory=dict)
    id: str = field(default_factory=new_id)
    started_at: datetime = field(default_factory=utcnow)
    ended_at: datetime | None = None

    @property
    def duration_ms(self) -> int | None:
        if self.ended_at is None:
            return None
        return int((self.ended_at - self.started_at).total_seconds() * 1000)


@dataclass(slots=True, kw_only=True)
class ErrorEvent:
    """A persisted failure, recorded so it can be diagnosed later.

    Deliberately *not* a domain aggregate: nothing in the business rules depends
    on it. It is an operational record, which is why it carries transport-level
    detail (method, path, status code) that no domain model would ever hold.
    """

    kind: str
    message: str
    organization_id: str | None = None
    run_id: str | None = None
    stack: str = ""
    metadata_json: dict = field(default_factory=dict)
    #: Where the failure happened: ``http``, ``worker`` or ``startup``.
    source: str = "http"
    #: ``error`` for anything unexpected, ``warning`` for expected 4xx noise,
    #: ``critical`` for startup/infrastructure failures.
    severity: str = "error"
    #: Exception class name (``ValueError``, ``IntegrityError``, …). Empty when
    #: the failure was not an exception.
    error_type: str = ""
    #: Stable hash of the failure's identity, so a thousand occurrences of the
    #: same bug group into one row in the console instead of a thousand.
    fingerprint: str = ""
    status_code: int | None = None
    method: str = ""
    path: str = ""
    user_id: str | None = None
    #: Correlates this record with the response the caller received and with
    #: every log line written while handling the same request.
    request_id: str = ""
    ip: str = ""
    user_agent: str = ""
    resolved_at: datetime | None = None
    resolved_note: str = ""
    id: str = field(default_factory=new_id)
    created_at: datetime = field(default_factory=utcnow)


class ErrorSource:
    """Where an error was caught. Kept as strings so a new source needs no
    migration."""

    HTTP = "http"
    WORKER = "worker"
    STARTUP = "startup"


class ErrorSeverity:
    ERROR = "error"
    WARNING = "warning"
    CRITICAL = "critical"


@dataclass(slots=True, kw_only=True)
class QualityMetric:
    organization_id: str
    name: str
    value: float
    dimensions_json: dict = field(default_factory=dict)
    id: str = field(default_factory=new_id)
    created_at: datetime = field(default_factory=utcnow)