/**
 * Deterministic control of report epistemic comparison inputs.
 *
 * Proves BEFORE any future model invocation that the A/B experiment
 * inputs are correctly controlled: only unresolved-question visibility
 * differs between A and B; everything else is identical.
 *
 * No live model calls. No mocking. Pure input-contract verification.
 */

import { describe, it, expect } from "vitest";
import fixture from "../fixtures/progressed-investigation-manufacturing.json";

const FIXED_PLAUSIBLE =
  "The rise in absolute complaint counts is likely an artifact of both the new CRM tagging system broadening what gets recorded as a complaint, combined with a proportional increase from higher production volume rather than a genuine deterioration in product quality.";

function buildABInputs(fix, includeUQ) {
  const sg = fix.situationGraph;
  const se = sg.nodes.filter(n => n.status === "known" || n.status === "supported").map(n => ({id: n.id, kind: n.kind, status: n.status, label: n.label}));
  const fi = fix.findings.filter(f2 => f2.status === "provisional" && f2.userDisposition === null).map(f3 => ({id: f3.id, proposition: f3.proposition}));
  const pi = [FIXED_PLAUSIBLE];
  const uq = sg.nodes.filter(n => n.kind === "unknown" && n.status === "unknown").map(n => ({id: n.id, label: n.label, description: n.description}));
  const ss = {centralStatement: sg.centralStatement, activeUnknownNodeId: sg.activeUnknownNodeId, resolvedNodeIds: [...sg.resolvedNodeIds], nodeCount: sg.nodes.length, edgeCount: sg.edges.length};
  const pc = {provider: "ollama", model: process.env.OLLAMA_MODEL || "configured-model"};
  return {supportedEvidence: se, findings: fi, plausibleInterpretations: pi, unresolvedQuestions: includeUQ ? [...uq] : [], scenarioState: ss, providerConfig: pc};
}

function deepEqual(a, b) {
  if (a === b) return true;
  if (a == null || b == null) return false;
  if (typeof a !== typeof b) return false;
  if (Array.isArray(a)) { if (!Array.isArray(b) || a.length !== b.length) return false; for (let i = 0; i < a.length; i++) if (!deepEqual(a[i], b[i])) return false; return true; }
  if (typeof a === "object") { const kA = Object.keys(a).sort(), kB = Object.keys(b).sort(); if (kA.length !== kB.length) return false; for (let i = 0; i < kA.length; i++) if (kA[i] !== kB[i] || !deepEqual(a[kA[i]], b[kB[i]])) return false; return true; }
  return false;
}

describe("Controlled A/B report epistemic comparison inputs", () => {
  it("builds canonical input objects for both A and B", () => {
    const a = buildABInputs(fixture, false);
    const b = buildABInputs(fixture, true);
    ["supportedEvidence","findings","plausibleInterpretations","unresolvedQuestions","scenarioState","providerConfig"].forEach(k => { expect(a).toHaveProperty(k); expect(b).toHaveProperty(k); });
  });

  it("A and B have identical admitted evidence", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(deepEqual(a.supportedEvidence, b.supportedEvidence)).toBe(true);
  });

  it("A and B have identical eligible Findings", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(deepEqual(a.findings, b.findings)).toBe(true);
  });

  it("A and B have identical fixed plausibleInterpretations", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(deepEqual(a.plausibleInterpretations, b.plausibleInterpretations)).toBe(true);
  });

  it("fixed plausible interpretation matches canonical value exactly", () => {
    const a = buildABInputs(fixture, false);
    expect(a.plausibleInterpretations).toHaveLength(1);
    expect(a.plausibleInterpretations[0]).toBe(FIXED_PLAUSIBLE);
  });

  it("A and B reference the same progressed investigation state", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(deepEqual(a.scenarioState, b.scenarioState)).toBe(true);
  });

  it("provider/model configuration is identical for A and B", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(a.providerConfig.provider).toBe(b.providerConfig.provider);
    expect(a.providerConfig.model).toBe(b.providerConfig.model);
  });

  it("A does not expose unresolved Open Questions (hidden)", () => {
    const a = buildABInputs(fixture, false);
    expect(a.unresolvedQuestions).toHaveLength(0);
  });

  it("B exposes exactly the canonical unresolved Open Questions", () => {
    const b = buildABInputs(fixture, true);
    const fu = fixture.situationGraph.nodes.filter(n => n.kind === "unknown" && n.status === "unknown");
    expect(b.unresolvedQuestions).toHaveLength(fu.length);
    for (const node of fu) { const found = b.unresolvedQuestions.find(uq => uq.id === node.id); expect(found).toBeDefined(); expect(found.label).toBe(node.label); expect(found.description).toBe(node.description); }
  });

  it("only unresolved visibility differs between A and B", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(deepEqual(a.supportedEvidence, b.supportedEvidence)).toBe(true);
    expect(deepEqual(a.findings, b.findings)).toBe(true);
    expect(deepEqual(a.plausibleInterpretations, b.plausibleInterpretations)).toBe(true);
    expect(deepEqual(a.scenarioState, b.scenarioState)).toBe(true);
    expect(deepEqual(a.providerConfig, b.providerConfig)).toBe(true);
    expect(a.unresolvedQuestions).not.toEqual(b.unresolvedQuestions);
  });

  it("fixed plausible interpretation is not admitted evidence", () => {
    const a = buildABInputs(fixture, false);
    for (const e of a.supportedEvidence) { expect(e.label).not.toContain(FIXED_PLAUSIBLE); expect(["known","supported"]).toContain(e.status); }
  });

  it("unresolved questions are not admitted evidence", () => {
    const b = buildABInputs(fixture, true);
    for (const uq of b.unresolvedQuestions) { const fn = fixture.situationGraph.nodes.find(n => n.id === uq.id); expect(fn.status).toBe("unknown"); expect(fn.kind).toBe("unknown"); }
  });

  it("unresolved questions are not plausibleInterpretations", () => {
    const b = buildABInputs(fixture, true);
    for (const uq of b.unresolvedQuestions) { expect(b.plausibleInterpretations).not.toContain(uq.label); expect(b.plausibleInterpretations[0]).toBe(FIXED_PLAUSIBLE); }
  });

  it("no fixture node conflates unresolved and evidence categories", () => {
    for (const node of fixture.situationGraph.nodes) {
      if (node.kind === "unknown" && node.status === "unknown") expect(["known","supported"]).not.toContain(node.status);
      else if (["known","supported"].includes(node.status)) expect(node.kind).not.toBe("unknown");
    }
  });

  it("inputs are constructed purely from fixture without provider or model dependency", () => {
    const a = buildABInputs(fixture, false); const b = buildABInputs(fixture, true);
    expect(typeof a.supportedEvidence).toBe("object");
    expect(typeof a.findings).toBe("object");
    expect(typeof a.plausibleInterpretations).toBe("object");
    expect(typeof a.unresolvedQuestions).toBe("object");
  });

  it("fixed plausible interpretation carries NON-EVIDENCE epistemic status", () => {
    const a = buildABInputs(fixture, false);
    expect(a.plausibleInterpretations).toHaveLength(1);
    expect(a.plausibleInterpretations[0]).toBe(FIXED_PLAUSIBLE);
    const el = a.supportedEvidence.map(e => e.label.toLowerCase());
    const il = FIXED_PLAUSIBLE.toLowerCase();
    for (const label of el) expect(label).not.toContain(il);
  });

  it("fixture has the minimum required content for A/B comparison", () => {
    const sg = fixture.situationGraph;
    expect(sg.nodes.filter(n => ["known","supported"].includes(n.status)).length).toBeGreaterThan(0);
    expect(sg.nodes.filter(n => n.kind === "unknown" && n.status === "unknown").length).toBeGreaterThan(0);
    expect(fixture.findings.filter(f => f.status === "provisional" && f.userDisposition === null).length).toBeGreaterThan(0);
  });
});