// L1 tests for the pure widget-descriptor builders (spec D2/D4, §4.1).
// Each builder turns plain params into a ui_request descriptor object -- no Pi
// context, no I/O. Golden files pin the exact shape; fuzzy tests check that bad
// params throw clearly rather than silently produce a broken widget.
// Run: npm test  (node --test)

const test = require("node:test");
const assert = require("node:assert");
const fs = require("node:fs");
const path = require("node:path");

const {
  buildSelectRequest,
  buildMultiselectRequest,
  buildArtifactGate,
  buildInfoRequest,
  buildFreetextRequest,
  buildSchemaLinkingRequest,
  buildJoinReviewRequest,
  withChildLinkage,
} = require("../core/builders.js");

const GOLDEN = path.join(__dirname, "golden");
const golden = (name) => JSON.parse(fs.readFileSync(path.join(GOLDEN, name)));

// --- golden shape tests -------------------------------------------------------

test("select F1 matches golden shape", () => {
  const result = buildSelectRequest({
    id: "u1", phase: "F1", title: "Disambigua 'ablazione'",
    options: [{ id: "o1", label: "procedura" }, { id: "o2", label: "patologia" }],
  });
  const g = golden("select_F1.json");
  assert.equal(result.widget, "select");
  assert.equal(result.type, "ui_request");
  assert.equal(result.schema_version, 1);
  assert.deepEqual(result.reserved, g.reserved); // back/exit/other framework hatches
  assert.deepEqual(result.options, g.options);
});

test("select no longer injects an Altro option (free-text is the reserved 'Other' control)", () => {
  const result = buildSelectRequest({
    id: "u", phase: "F1", title: "x",
    options: [{ id: "a", label: "A" }],
  });
  assert.equal(result.options.find((o) => o.id === "other"), undefined, "no injected Altro option");
  assert.ok(!("allow_other" in result), "the unused allow_other flag is gone");
  assert.deepEqual(result.reserved, ["back", "exit", "other"], "Altro still offered via the reserved control");
});

test("select surfaces a recommended marker when given", () => {
  const result = buildSelectRequest({
    id: "u", phase: "F1", title: "x",
    options: [{ id: "a", label: "A" }, { id: "b", label: "B" }],
    recommended: "b",
  });
  assert.equal(result.recommended, "b");
});

test("multiselect F4 matches golden + carries content + allowEmpty", () => {
  // a multiselect with allow_empty:false MUST have options (zero options is a
  // broken widget); the golden uses allow_empty:true for the empty-options case
  // and allow_empty:false when options are present.
  const result = buildMultiselectRequest({
    id: "u3", phase: "F4", title: "Tabelle",
    options: [{ id: "dim_pazienti", label: "dim_pazienti" }],
    content: { candidates: [] }, allowEmpty: false,
  });
  const g = golden("multiselect_F4.json");
  assert.equal(result.widget, "multiselect");
  assert.equal(result.allow_empty, false);
  assert.ok(!("allow_other" in result), "the unused allow_other flag is gone");
  assert.ok("content" in result);
  assert.deepEqual(result.reserved, g.reserved);
});

test("multiselect with allow_empty:true accepts zero options", () => {
  const result = buildMultiselectRequest({
    id: "u", phase: "F4", title: "x", options: [], allowEmpty: true,
  });
  assert.equal(result.allow_empty, true);
  assert.deepEqual(result.options, []);
});

test("multiselect with allowEmpty:false and zero options throws", () => {
  assert.throws(
    () => buildMultiselectRequest({ id: "u", phase: "F4", title: "x", options: [], allowEmpty: false }),
    /allow_empty|options/i,
  );
});

test("artifact-gate F5 schema matches golden", () => {
  const result = buildArtifactGate({
    id: "u2", phase: "F5", title: "Schema-linking",
    artifact: { kind: "schema_linking", data: { candidates: [] }, version: 1 },
    action: { kind: "confirm", prompt: "Confermi?" },
  });
  const g = golden("artifact_gate_F5.json");
  assert.equal(result.widget, "artifact-gate");
  assert.equal(result.artifact.kind, "schema_linking");
  assert.equal(result.action.kind, "confirm");
  assert.deepEqual(result.reserved, g.reserved);
});

// --- the other widgets --------------------------------------------------------

test("info request is fire-and-forget (no reserved, no options)", () => {
  const result = buildInfoRequest({ phase: "F2", level: "info", text: "sto per proporti lo schema-linking" });
  assert.equal(result.widget, "info");
  assert.equal(result.level, "info");
  assert.equal(result.type, "ui_request");
  assert.equal(result.id, undefined, "info is not correlated like a blocking widget");
  assert.ok(!("reserved" in result));
});

test("freetext request carries a title and no options", () => {
  const result = buildFreetextRequest({ id: "u9", phase: "F1", title: "Specifica…" });
  assert.equal(result.widget, "freetext");
  assert.equal(result.title, "Specifica…");
  assert.deepEqual(result.reserved, ["back", "exit", "other"]);
});

test("buildSchemaLinkingRequest carries tables + reserved", () => {
  const out = buildSchemaLinkingRequest({
    id: "u7", phase: "F4", title: "F4 — Schema linking",
    tables: [{ id: "t1", name: "dim_patient", kind: "promote", columns: [] }],
  });
  assert.equal(out.widget, "schema-linking");
  assert.equal(out.id, "u7");
  assert.equal(out.tables.length, 1);
  assert.deepEqual(out.reserved, ["back", "exit", "other"]);
});

test("buildJoinReviewRequest exposes joins as read-only review items", () => {
  const out = buildJoinReviewRequest({
    id: "u8",
    phase: "F4",
    title: "F4 — Proposed joins",
    options: [
      {
        id: "patient-events",
        label: "Patient to events",
        detail: "JOIN dim_patient p ON p.cod_paz = e.cod_paz",
        rationale: "Standard patient key",
      },
    ],
  });

  assert.equal(out.widget, "join-review");
  assert.equal(out.confirm_label, "Continue");
  assert.deepEqual(out.options, [
    {
      id: "patient-events",
      label: "Patient to events",
      detail: "JOIN dim_patient p ON p.cod_paz = e.cod_paz",
      rationale: "Standard patient key",
    },
  ]);
  assert.deepEqual(out.reserved, ["back", "exit", "other"]);
});

test("withChildLinkage sets option.opens and returns the option", () => {
  const child = { widget: "freetext", title: "Motivazione del rifiuto" };
  const option = withChildLinkage({ id: "reject", label: "Rifiuta" }, child);
  assert.deepEqual(option.opens, child);
});

// --- fuzzy tests (bad params must throw clearly, never silently break) --------

test("select with missing title throws clearly", () => {
  assert.throws(
    () => buildSelectRequest({ id: "u", phase: "F1", options: [] }),
    /title/i,
  );
});

test("select with non-array options throws clearly", () => {
  assert.throws(
    () => buildSelectRequest({ id: "u", phase: "F1", title: "x", options: "notalist" }),
    /options/i,
  );
});

test("artifact-gate with missing artifact throws clearly", () => {
  assert.throws(
    () => buildArtifactGate({ id: "u", phase: "F5", title: "x", action: { kind: "confirm" } }),
    /artifact/i,
  );
});

test("artifact-gate with unknown action kind throws clearly", () => {
  assert.throws(
    () => buildArtifactGate({
      id: "u", phase: "F5", title: "x",
      artifact: { kind: "cte", data: {}, version: 1 },
      action: { kind: "bogus" },
    }),
    /action/i,
  );
});

test("buildArtifactGate derives approve/reject options from action.kind", () => {
  const w = buildArtifactGate({
    id: "u1",
    phase: "F1",
    title: "Chiudi fase",
    artifact: { kind: "phase", data: {} },
    action: { kind: "approve_reject" },
  });
  assert.deepEqual(w.options, [
    { id: "approve", label: "Salva e procedi", recommended: true },
    { id: "reject", label: "Rifiuta" },
  ]);
});

test("buildArtifactGate: confirm -> single approve; view_only -> no options", () => {
  const confirm = buildArtifactGate({
    id: "u1", phase: "F1", title: "t", artifact: { kind: "phase", data: {} }, action: { kind: "confirm" },
  });
  assert.deepEqual(confirm.options, [{ id: "approve", label: "Salva e procedi", recommended: true }]);
  const viewOnly = buildArtifactGate({
    id: "u1", phase: "F1", title: "t", artifact: { kind: "phase", data: {} }, action: { kind: "view_only" },
  });
  assert.deepEqual(viewOnly.options, []);
});