// ---------------------------------------------------------------------------
// UI-shaped types (used by the existing pages; backed by in-memory sample data
// when no API is configured). Keep these stable — the rest of the app reads
// from them.
// ---------------------------------------------------------------------------

export type ClaimStatus =
  | "draft"
  | "submitted"
  | "accepted"
  | "denied"
  | "paid"
  | "pending";

export type RemittanceStatus = "received" | "posted" | "reconciled";

export type ActivityKind =
  | "claim_submitted"
  | "claim_paid"
  | "claim_denied"
  | "claim_accepted"
  | "remit_received"
  | "provider_added";

export interface Claim {
  id: string;
  patientName: string;
  providerNpi: string;
  payerName: string;
  cptCode: string;
  billedAmount: number;
  receivedAmount: number;
  status: ClaimStatus;
  submissionDate: string;
  denialReason?: string;
}

export interface Provider {
  npi: string;
  name: string;
  taxId: string;
  address: string;
  city: string;
  state: string;
  zip: string;
  phone: string;
  claimCount: number;
  outstandingAr: number;
}

export interface Remittance {
  id: string;
  claimId: string;
  payerName: string;
  paidAmount: number;
  adjustmentAmount: number;
  receivedDate: string;
  checkNumber: string;
  status: RemittanceStatus;
  denialReason?: string | null;
  validationWarnings?: string[];
}

export interface Activity {
  id: string;
  kind: ActivityKind;
  message: string;
  timestamp: string;
  npi?: string;
  amount?: number;
}

// ---------------------------------------------------------------------------
// Backend-aligned types (snake_case to match FastAPI JSON output 1:1).
// These mirror the Pydantic models in
//   backend/src/cyclone/parsers/models.py        (837P)
//   backend/src/cyclone/parsers/models_835.py    (835 ERA)
// Numeric fields are strings (Decimals serialized); dates are ISO strings.
// ---------------------------------------------------------------------------

// --- 837P ------------------------------------------------------------------

export interface Address {
  line1: string;
  line2?: string | null;
  city: string;
  state: string;
  zip: string;
}

export interface BillingProvider {
  name: string;
  npi: string;
  tax_id?: string | null;
  address?: Address | null;
}

export interface Subscriber {
  first_name: string;
  last_name: string;
  member_id: string;
  dob?: string | null;
  gender?: "M" | "F" | "U" | null;
  address?: Address | null;
}

export interface Payer {
  name: string;
  id: string;
}

export interface ClaimHeader {
  claim_id: string;
  total_charge: string; // Decimal serialized
  place_of_service?: string | null;
  facility_code_qualifier?: string | null;
  frequency_code?: string | null;
  provider_signature?: string | null;
  assignment?: string | null;
  release_of_info?: string | null;
  prior_auth?: string | null;
}

export interface Diagnosis {
  code: string;
  qualifier?: string | null;
}

export interface Procedure {
  qualifier: string;
  code: string;
  modifiers: string[];
}

export interface ServiceLine {
  line_number: number;
  procedure: Procedure;
  charge: string; // Decimal serialized
  unit_type?: string | null;
  units?: string | null; // Decimal serialized
  place_of_service?: string | null;
  service_date?: string | null;
  provider_reference?: string | null;
}

export interface ValidationIssue {
  rule: string;
  severity: "error" | "warning";
  message: string;
  segment_index?: number | null;
}

export interface ValidationReport {
  passed: boolean;
  errors: ValidationIssue[];
  warnings: ValidationIssue[];
}

export interface Envelope {
  sender_id: string;
  receiver_id: string;
  control_number: string;
  transaction_date: string; // ISO date
  transaction_time?: string | null;
  implementation_guide?: string | null;
}

export interface BatchSummary {
  input_file: string;
  control_number?: string | null;
  transaction_date?: string | null;
  total_claims: number;
  passed: number;
  failed: number;
  failed_claim_ids: string[];
  issues_by_rule: Record<string, number>;
  output_dir?: string | null;
}

export interface ClaimOutput {
  claim_id: string;
  control_number: string;
  transaction_date: string; // ISO date
  billing_provider: BillingProvider;
  subscriber: Subscriber;
  payer: Payer;
  claim: ClaimHeader;
  diagnoses: Diagnosis[];
  service_lines: ServiceLine[];
  validation: ValidationReport;
  raw_segments: string[][];
}

export interface ParseResult837 {
  envelope: Envelope | null;
  claims: ClaimOutput[];
  summary: BatchSummary;
}

// --- 835 ERA ---------------------------------------------------------------

export interface FinancialInfo {
  handling_code: string;
  paid_amount: string; // Decimal serialized
  credit_debit_flag: string;
  payment_method?: string | null;
  payer_tax_id?: string | null;
  payment_date?: string | null; // ISO date
}

export interface ReassociationTrace {
  trace_type_code: string;
  trace_number: string;
  originating_company_id: string;
  payer_id?: string | null;
}

export interface Payer835 {
  name: string;
  id?: string | null;
  address?: Address | null;
  contact_url?: string | null;
}

export interface Payee835 {
  name: string;
  npi: string;
  address?: Address | null;
}

export interface ClaimAdjustment {
  group_code: string;
  reason_code: string;
  amount: string; // Decimal serialized
  quantity?: string | null;
}

export interface ServicePayment {
  line_number: number;
  procedure_qualifier: string;
  procedure_code: string;
  modifiers: string[];
  charge: string;
  payment: string;
  units?: string | null;
  unit_type?: string | null;
  service_date?: string | null;
  adjustments: ClaimAdjustment[];
  ref_benefit_plan?: string | null;
}

export interface ClaimPayment {
  payer_claim_control_number: string;
  status_code: string;
  status_label?: string | null;
  total_charge: string;
  total_paid: string;
  patient_responsibility?: string | null;
  claim_filing_indicator?: string | null;
  original_claim_id?: string | null;
  facility_type?: string | null;
  frequency_code?: string | null;
  per_diem_covered_days?: string | null;
  ref_benefit_plan?: string | null;
  service_payments: ServicePayment[];
  raw_segments: string[][];
}

export interface ParseResult835 {
  envelope: Envelope;
  financial_info: FinancialInfo;
  trace: ReassociationTrace;
  payer: Payer835;
  payee: Payee835;
  claims: ClaimPayment[];
  summary: BatchSummary;
  validation?: ValidationReport | null;
}

// --- NDJSON streaming ------------------------------------------------------
// The backend emits one JSON object per line during an NDJSON stream:
//   { "type": "<event>", "data": <object> }
// See backend/src/cyclone/api.py:_ndjson_stream* for the source of truth.

export type NdjsonEventType =
  | "envelope"
  | "claim"
  | "claim_payment"
  | "financial_info"
  | "trace"
  | "payer"
  | "payee"
  | "summary";

export interface NdjsonEvent<T = unknown> {
  type: NdjsonEventType;
  data: T;
}

// --- Parsed-batch slice (used by the Upload page + store) ------------------

export type ParsedBatchKind = "837p" | "835";

export interface ParsedBatch {
  id: string;
  kind: ParsedBatchKind;
  inputFilename: string;
  parsedAt: string; // ISO timestamp
  claimCount: number;
  passed: number;
  failed: number;
  claimIds: string[];
  summary: BatchSummary;
}