import type { ProvenanceBlock } from '../receipts/schema';
export type WorkflowState =
  | 'active'
  | 'paused'
  | 'cancelled'
  | 'completed'
  | 'budget_capped'
  | 'duration_capped';

export type ReviewerVerdict = 'approve' | 'block' | 'revise' | null;

export interface WorkflowConfig {
  name: string;
  budget_cap_usd: number;
  duration_cap_hours: number;
  checkpoint_every_outcomes?: number;
  parent_outcomes?: string[];
  resume_if_exists?: boolean;
  metadata?: Record<string, string | number | boolean>;
  user_id?: string;
  api_base_url?: string;
  license_key?: string;
  signingKeys?: {
    /** 32-byte Ed25519 secret seed. */
    privateKey: Uint8Array;
    /** 32-byte Ed25519 public key. */
    publicKey: Uint8Array;
  };
  post_json?: (url: string, body: unknown, headers: Record<string, string>) => Promise<unknown>;
  get_json?: (url: string, headers: Record<string, string>) => Promise<unknown>;
}

export interface ReviewerCascadeEvidence {
  triggered: boolean;
  drafter_model: string | null;
  reviewer_model: string | null;
  drafter_output_hash: string | null;
  reviewer_verdict: ReviewerVerdict;
  reviewer_reasoning_hash: string | null;
  review_started_at: string | null;
  review_completed_at: string | null;
}

export interface ReceiptV2 {
  receipt_id: string;
  schema_version: 2;
  outcome_name: string;
  user_id: string;
  cost_usd: number;
  signed_at: string;
  signature: string;
  public_key_fingerprint: string;
  public_key_hex: string;
  workflow_id: string | null;
  parent_receipt_id: string | null;
  chain_validation_hash: string | null;
  workflow_checkpoint_idx: number | null;
  workflow_total_spend_usd_to_date: number | null;
  is_checkpoint: boolean;
  checkpoint_label: string | null;
  reviewer_cascade: ReviewerCascadeEvidence | null;
  receipt_type?: 'outcome' | 'checkpoint' | 'cancel' | 'cap_hit' | 'completed';
  cancelled_reason?: string | null;
}

export interface CheckpointReceipt extends ReceiptV2 {
  is_checkpoint: true;
}

export interface WorkflowStatus {
  workflow_id: string;
  state: WorkflowState;
  total_spend_usd: number;
  budget_cap_usd: number;
  budget_remaining_usd: number;
  budget_pct_used: number;
  outcome_count: number;
  last_receipt_id: string | null;
  last_checkpoint_id: string | null;
  last_chain_hash: string | null;
  duration_elapsed_ms: number;
  duration_cap_ms: number;
  duration_remaining_ms: number;
}

export interface ValidationResult {
  ok: true;
}

export interface ValidationFailure {
  ok: false;
  broken_at: number;
  reason: 'signature_invalid' | 'chain_hash_mismatch' | 'parent_reference_mismatch';
}

export type ChainValidationResult = ValidationResult | ValidationFailure;


export interface ReceiptV3 extends Omit<ReceiptV2, 'schema_version'> {
  schema_version: 3;
  provenance: ProvenanceBlock;
}