export type FetchRequestStatus =
  | "pending"
  | "processing"
  | "paused"
  | "raw_expenses_done"
  | "enriched_done"
  | "completed"
  | "failed";

export type SourceType = "file" | "pdf" | "xlsx" | "csv" | "email";

export interface FileSource {
  type?: SourceType;
  path: string;
  bank: string;
  raw_lines?: string[];
  txn_blocks?: Record<string, any>;
  txn_dicts?: Record<string, any>[];
  txn_dict_count?: number;
  txn_dicts_count?: number;
}

export interface PdfSource extends FileSource {
  type: "pdf";
}

export interface XlsxSource extends FileSource {
  type: "xlsx";
}

export interface CsvSource extends FileSource {
  type: "csv";
}

export interface EmailSource {
  type: "email";
  bank: string;
  from_email?: string;
  subject?: string;
  raw_terms?: string[];
  txn_dict_count?: number;
  txn_dicts_count?: number;
}

export type PipelineType = "heuristic" | "llm" | "llama_parse";

export type TrustFallback = "amount" | "balance";

export interface FetchRequestCreate {
  source: PdfSource | XlsxSource | CsvSource | EmailSource;
  account_name: string;
  pipeline?: PipelineType;
  trust_fallback?: TrustFallback | null;
  payor_username?: string;
  start_date?: string;
  end_date?: string;
}

export interface FetchRequestUpdate {
  status?: FetchRequestStatus;
  error_message?: string | null;
}

export interface FetchRequest extends FetchRequestCreate {
  id: string;
  status: FetchRequestStatus;
  fingerprint: string;
  completed_at?: string | null;
  error_message?: string | null;
  retry_count?: number;
  created_at: string;
}

export interface UploadResult {
  original_filename: string;
  saved_as: string;
  content_type: string;
  url: string;
  absolute_path: string;
}

export interface AmbiguityCandidate {
  amount: number;
  balance: number;
}

export interface PendingAmbiguity {
  id: string;
  fetch_request: string;
  step_index?: number;
  line: string;
  ocr_amount: number;
  ocr_balance: number;
  prev_balance: number;
  candidates: AmbiguityCandidate[];
  chosen?: AmbiguityCandidate | null;
  resolved_at?: string | null;
  status: "pending" | "resolved";
  created_at: string;
}

export interface ResolveAmbiguityPayload {
  chosen: {
    amount: number;
    balance: number;
  };
}

export type SSEEventStep =
  | "load_content" | "raw_lines" | "txn_blocks" | "txn_dicts"
  | "resume_extract" | "extract" | "paused" | "complete" | "enrich"
  | "save_expenses" | "pipeline";

export type SSEEventStatus =
  | "started" | "completed" | "skipped" | "paused" | "progress" | "failed";

export interface ProgressMessage {
  lines?: number;
  blocks?: number;
  count?: number;
  unit?: string;
  raw_ocr_line?: string;
  error?: string;
}

export interface SSEEvent {
  step: SSEEventStep;
  status: SSEEventStatus;
  message: ProgressMessage;
}

export interface FetchRequestFilters {
  status?: FetchRequestStatus[];
  account_name?: string;
  source_type?: SourceType;
}

export function formatApiError(err: any): string {
  if (!err?.response) return err?.message || "Request failed";
  const data = err.response.data;
  const status = err.response.status;

  if (status === 422 && Array.isArray(data?.detail)) {
    return data.detail.map((d: any) => {
      const field = d.loc?.filter((s: string) => s !== "body").pop() || "field";
      if (d.type === "value_error.missing") return `Missing: ${field}`;
      return `${field}: ${d.msg}`;
    }).join("; ");
  }

  if (typeof data?.detail === "string") return data.detail;
  return `Request failed (${status})`;
}

export const RETRY_MAX = 3;