export const MAX_TASKS = 100;
export const MAX_TASK_NAME = 120;
export const MAX_TASK_INSTRUCTIONS = 8000;
export const MAX_TASK_RUN_PAGE = 100;

export type TaskSchedule =
  | { kind: "once"; at: string }
  | { kind: "cron"; expression: string; timezone: "UTC" };

export interface TaskInput {
  name: string;
  instructions: string;
  schedule: TaskSchedule;
  enabled: boolean;
}

export interface CreateTaskInput extends TaskInput {
  id: string;
  conversationId: string;
}

export interface TaskDefinition extends CreateTaskInput {
  version: number;
  createdAt: string;
  updatedAt: string;
}

export type TaskRunStatus =
  | "dispatching"
  | "dispatch_error"
  | "pending"
  | "running"
  | "completed"
  | "aborted"
  | "skipped"
  | "error";

export interface TaskRun {
  id: string;
  taskId: string;
  taskVersion: number;
  conversationId: string;
  submissionId: string;
  source: "scheduled" | "manual";
  scheduledFor: string;
  createdAt: string;
  status: TaskRunStatus;
  startedAt: string | null;
  completedAt: string | null;
  failureCode:
    "dispatch_failed" | "turn_failed" | "turn_aborted" | "turn_skipped" | null;
}

export interface TaskSummary extends TaskDefinition {
  previousRun: TaskRun | null;
  /** Actual native alarm time, or null when disabled, consumed or unavailable. */
  nextRunAt: string | null;
  schedulingError?: "schedule_unavailable" | null;
}

export interface TaskRunCursor {
  createdAt: string;
  id: string;
}

export interface TaskRunPage {
  runs: TaskRun[];
  nextCursor: TaskRunCursor | null;
}