// lib/sars-runners.ts
// Registry of SARS return types the workbench knows how to run.
//
// One entry per return type. Adding a new return type = one entry here.
// The form, the API, the results table, and the .py lookup all read
// from this — the page and components stay generic.
//
// Per return type we record:
//   - The Python script that knows how to capture it (in scripts/).
//   - The period format the user types (e.g. "YYYYMM" for monthly).
//   - The period granularity, which drives the period-UX component.
//   - The columns to render in the results table.
//   - The PB collection that future per-row writes will target.
//
// EMP201 + VAT201 are both enabled today. The other 3 are registered
// disabled so the dropdown can show them as "coming soon". The VAT201
// capture and push scripts are in scripts/ (mirrors of the EMP201
// pair) and target PB collection ysterbaard_SARS_VAT_VAT201 (note the
// double-VAT in the collection name — that's the actual schema name).

export type PeriodGranularity = "monthly" | "annual" | "bi-monthly";

export interface ResultColumn {
  /** JSON key in the .py's per-row payload. */
  key: string;
  /** Column header. */
  label: string;
  /** Optional Tailwind class for the cell (e.g. text-right for numbers). */
  cellClassName?: string;
}

export interface SarsRunner {
  /** Machine code, matches the SARS form code (also the .py CLI value). */
  code: string;
  /** Human-readable label shown in the dropdown. */
  label: string;
  /** Script filename inside the scripts/ directory. */
  script: string;
  /** Free-text period format the user types. Shown as a hint. */
  periodFormat: string;
  /** Drives the period-UX component. */
  periodGranularity: PeriodGranularity;
  /** Columns to render in the results table. */
  resultSchema: ResultColumn[];
  /** PB collection for future per-row writes (null until wired up). */
  pbCollection: string | null;
  /** Push-to-PB script filename in scripts/. null until a push tool exists. */
  pushScript: string | null;
  /** Whether the runner is currently wired up and runnable. */
  enabled: boolean;
}

export const SARS_RUNNERS: SarsRunner[] = [
  {
    code: "EMP201",
    label: "EMP201 (PAYE)",
    script: "SARS Retun EMP201 single or all pty.py",
    periodFormat: "YYYYMM",
    periodGranularity: "monthly",
    resultSchema: [
      { key: "period", label: "Period" },
      { key: "date_submitted", label: "Date Submitted", cellClassName: "font-mono text-muted" },
      { key: "paye_payable", label: "PAYE", cellClassName: "text-right tabular-nums" },
      { key: "sdl_payable", label: "SDL", cellClassName: "text-right tabular-nums" },
      { key: "uif_payable", label: "UIF", cellClassName: "text-right tabular-nums" },
      { key: "total_payable", label: "Total", cellClassName: "text-right tabular-nums font-semibold" },
      { key: "payment_ref_no", label: "Payment Ref" },
    ],
    pbCollection: "ysterbaard_SARS_EMP201_PAYE",
    pushScript: "SARS retun EMP201 push to PB.py",
    enabled: true,
  },
  // ── Coming soon ───────────────────────────────────────────────
  {
    code: "VAT201",
    label: "VAT201",
    script: "SARS Retun VAT201 single or all pty.py",
    periodFormat: "YYYYMM",
    // VAT201 is NOT monthly for every company. Each client's SARS
    // "VAT Return Every" setting (`sars_vat_returns_period`) decides which
    // months exist — e.g. an uneven-months client has no Feb/Apr/Jun
    // returns at all, they are non-existent rather than unfiled.
    //
    // `monthly` here describes the period *entry format* (the user still
    // types YYYYMM), not the filing frequency. The per-company cadence is
    // resolved from PocketBase in the run route and passed to the .py as
    // `--cadence`; the UI narrows the previewed months with the same table
    // in lib/vat-cadence.ts.
    periodGranularity: "monthly",
    resultSchema: [
      { key: "period", label: "Period" },
      { key: "date_filed", label: "Date Filed", cellClassName: "font-mono text-muted" },
      { key: "total_payable", label: "Total (38)", cellClassName: "text-right tabular-nums font-semibold" },
      { key: "standard_rate_1", label: "Std rate (1)", cellClassName: "text-right tabular-nums" },
      { key: "zero_rate_2", label: "Zero rate (2)", cellClassName: "text-right tabular-nums" },
      { key: "exempt_and_non_supplies_3", label: "Exempt & non (3)", cellClassName: "text-right tabular-nums" },
      { key: "capital_goods_and_services_supplied_to_you_14", label: "Capital goods (14)", cellClassName: "text-right tabular-nums" },
      { key: "other_goods_and_services_supplied_to_you_15", label: "Other inputs (15)", cellClassName: "text-right tabular-nums" },
      { key: "payment_reference", label: "Pay Ref" },
    ],
    pbCollection: "ysterbaard_SARS_VAT_VAT201",
    pushScript: "SARS retun VAT201 push to PB.py",
    enabled: true,
  },
  {
    code: "IRP6",
    label: "Provisional Tax (IRP6)",
    script: "",
    periodFormat: "YYYYMM",
    periodGranularity: "bi-monthly",
    resultSchema: [],
    pbCollection: null,
    pushScript: null,
    enabled: false,
  },
  {
    code: "ITR14",
    label: "Income Tax (ITR14/ITR12T/IT12EI)",
    script: "",
    periodFormat: "YYYY",
    periodGranularity: "annual",
    resultSchema: [],
    pbCollection: null,
    pushScript: null,
    enabled: false,
  },
  {
    code: "STC",
    label: "STC",
    script: "",
    periodFormat: "YYYY-MM-DD",
    periodGranularity: "annual",
    resultSchema: [],
    pbCollection: null,
    pushScript: null,
    enabled: false,
  },
];

export function getRunner(code: string): SarsRunner | undefined {
  return SARS_RUNNERS.find((r) => r.code === code);
}

export function listEnabledRunners(): SarsRunner[] {
  return SARS_RUNNERS.filter((r) => r.enabled);
}