/**
 * RTO.20A — Derived Focused Current-View Apparatus
 *
 * Purpose: Test whether an LLM can produce a concise, faithful "where are we
 * now?" view for one selected investigation using only authoritative granular
 * fragments and their known relationship, without whole-case reconstruction,
 * accumulated focused state, or introducing new evidential claims.
 *
 * Design boundary:
 *   - Standalone experimental runner.
 *   - Zero production code changes.
 *   - Inspect-only by default (zero live model calls).
 *   - --live flag enables exactly one live call producing a derived current view.
 *
 * Fixed record:
 *   Fragment 2 — competitor hiring + conference signals
 *   Fragment 3 — technical architecture + prototype evidence
 *   One known relationship between them
 *
 * Output contract (presentation only, not new reasoning):
 *   { currentView, whatChanged, remainingUncertainties }
 */

import fs from "fs/promises";
import path from "path";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const resultsDir = path.resolve(__dirname, "../../tests/experimental/results");

// ─── Fragment paths ──────────────────────────────────────────────────────────

const FRAGMENT_2_PATH = path.resolve(
  __dirname,
  "../../tests/experimental/results/rto-granular-fragment-turn2.json"
);

const FRAGMENT_3_PATH = path.resolve(
  __dirname,
  "../../tests/experimental/results/rto-granular-fragment-turn3.json"
);

// ─── Known relationship (supplied, not discovered) ───────────────────────────

const KNOWN_RELATIONSHIP =
  "Fragment 3's technical evidence bears on Fragment 2's earlier uncertainty " +
  "by making active competing-product development more plausible, while " +
  "commercialisation and other uncertainties remain unresolved.";

// ─── Load fragments ──────────────────────────────────────────────────────────

async function loadFragments() {
  const frag2Raw = await fs.readFile(FRAGMENT_2_PATH, "utf-8");
  const frag3Raw = await fs.readFile(FRAGMENT_3_PATH, "utf-8");

  const frag2 = JSON.parse(frag2Raw);
  const frag3 = JSON.parse(frag3Raw);

  if (!frag2.structuredResult) {
    throw new Error("Fragment 2 missing structuredResult");
  }
  if (!frag3.structuredResult) {
    throw new Error("Fragment 3 missing structuredResult");
  }

  return {
    fragment2: frag2,
    structuredResult2: frag2.structuredResult,
    fragment3: frag3,
    structuredResult3: frag3.structuredResult,
  };
}

// ─── Build the derived-current-view prompt ─────────────────────────────────────

function buildCurrentViewPrompt(srs2, srs3) {
  const parts = [
    "You are producing a FACILITATOR CURRENT VIEW — a concise summary of where one",
    "selected investigation stands right now. This is PRESENTATION ONLY.",
    "",
    "Return exactly one JSON object with these fields:",
    "- currentView (string): Where does this investigation stand? What do we understand?",
    "- whatChanged (string): How has the interpretation shifted from the earlier evidence?",
    "- remainingUncertainties (array of strings): What is still unresolved?",
    "",
    "CRITICAL BOUNDARIES:",
    "- Every claim must be traceable to Fragment 2, Fragment 3, or the known relationship.",
    "- Do NOT introduce new evidential claims.",
    "- Do NOT take action or advise on decisions.",
    "- Do NOT predict decisions or outcomes.",
    "- Do NOT select next questions or take ownership from the user.",
    "- This output is derived presentation, not new authoritative reasoning.",
    "",
    "Selected investigation identity:",
  ];

  // Node label from Fragment 2 (they share the same target)
  parts.push(`- target node: "${srs2.targetNodeId}"`);
  parts.push("");

  // ── Fragment 2 ────────────────────────────────────────────────
  parts.push("=== Fragment 2 (earlier evidence) ===");
  if (srs2.observations && srs2.observations.length) {
    parts.push("Observations:");
    for (const o of srs2.observations) {
      parts.push(`  - ${o}`);
    }
  }
  if (srs2.uncertainties && srs2.uncertainties.length) {
    parts.push("Uncertainties:");
    for (const u of srs2.uncertainties) {
      parts.push(`  - ${u}`);
    }
  }
  if (srs2.assumptions && srs2.assumptions.length) {
    parts.push("Assumptions:");
    for (const a of srs2.assumptions) {
      parts.push(`  - ${a}`);
    }
  }
  if (srs2.relationships && srs2.relationships.length) {
    parts.push("Relationships:");
    for (const r of srs2.relationships) {
      parts.push(`  - ${r.from} -> ${r.to} (${r.type})`);
    }
  }
  parts.push("");

  // ── Fragment 3 ────────────────────────────────────────────────
  parts.push("=== Fragment 3 (newer evidence) ===");
  if (srs3.observations && srs3.observations.length) {
    parts.push("Observations:");
    for (const o of srs3.observations) {
      parts.push(`  - ${o}`);
    }
  }
  if (srs3.uncertainties && srs3.uncertainties.length) {
    parts.push("Uncertainties:");
    for (const u of srs3.uncertainties) {
      parts.push(`  - ${u}`);
    }
  }
  if (srs3.assumptions && srs3.assumptions.length) {
    parts.push("Assumptions:");
    for (const a of srs3.assumptions) {
      parts.push(`  - ${a}`);
    }
  }
  if (srs3.relationships && srs3.relationships.length) {
    parts.push("Relationships:");
    for (const r of srs3.relationships) {
      parts.push(`  - ${r.from} -> ${r.to} (${r.type})`);
    }
  }
  parts.push("");

  // ── Known relationship ────────────────────────────────────────
  parts.push("=== Known relationship (supplied, not discovered) ===");
  parts.push(KNOWN_RELATIONSHIP);
  parts.push("");

  // ── Instructions ──────────────────────────────────────────────
  parts.push("Produce a concise facilitator view of where this selected investigation stands now.");
  parts.push("Answer: What do we understand now? How has the interpretation shifted? What remains unresolved?");
  parts.push("Do NOT take action or advise on decisions.");
  parts.push("Return JSON only. No additional commentary.");

  return parts.join("\n");
}

// ─── Output schema for live mode ──────────────────────────────────────────────

const CURRENT_VIEW_SCHEMA = {
  required: ["currentView", "whatChanged", "remainingUncertainties"],
  forbidden: [
    "recommendation",
    "nextQuestion",
    "confidence",
    "materiality",
    "decision",
    "action",
    "status",
    "score",
    "addedNodes",
    "updatedNodes",
    "resolvedNodeIds",
    "selectedQuestion",
  ],
};

function validateOutputSchema(result) {
  const errors = [];

  for (const field of CURRENT_VIEW_SCHEMA.required) {
    if (!(field in result)) {
      errors.push(`Missing required field: ${field}`);
    }
  }

  if (!Array.isArray(result.remainingUncertainties)) {
    errors.push("remainingUncertainties must be an array");
  } else if (result.remainingUncertainties.some((s) => typeof s !== "string")) {
    errors.push("remainingUncertainties array items must all be strings");
  }

  for (const field of CURRENT_VIEW_SCHEMA.forbidden) {
    if (field in result && typeof result[field] !== "undefined") {
      errors.push(`Forbidden field present: ${field}`);
    }
  }

  return errors;
}

// ─── Inspect mode (default: zero model calls) ─────────────────────────────────

async function inspectApparatus() {
  console.log("=== RTO.20A Derived Focused Current-View Apparatus (inspect-only) ===\n");

  // Load and verify fragments
  let fragment2, structuredResult2, fragment3, structuredResult3;
  try {
    const frags = await loadFragments();
    fragment2 = frags.fragment2;
    structuredResult2 = frags.structuredResult2;
    fragment3 = frags.fragment3;
    structuredResult3 = frags.structuredResult3;
  } catch (e) {
    console.log("ERROR: Cannot load fragments:", e.message);
    process.exit(1);
  }

  // Fragment verification
  const f2Loaded = typeof structuredResult2 === "object" && structuredResult2 !== null;
  const f3Loaded = typeof structuredResult3 === "object" && structuredResult3 !== null;
  console.log("--- Fragment verification ---");
  console.log(`Fragment 2 loaded: ${f2Loaded ? "YES" : "NO"}`);
  console.log(`Fragment 3 loaded: ${f3Loaded ? "YES" : "NO"}`);

  // Build prompt for inspection
  const prompt = buildCurrentViewPrompt(structuredResult2, structuredResult3);

  // Known relationship verification
  const relationshipIncluded = prompt.includes(KNOWN_RELATIONSHIP);
  console.log("\n--- Relationship ---");
  console.log(`Known relationship included: ${relationshipIncluded ? "YES" : "NO"}`);

  // Context boundary checks
  console.log("\n--- Context boundaries ---");
  const boundaryChecks = {
    "Whole SituationGraph": !prompt.includes("SituationGraph"),
    "Central case statement": !prompt.includes("central case") && !prompt.includes("centralStatement"),
    "Turn history": !prompt.includes("turn history"),
    "Other fragments": !prompt.includes("Fragment 1"),
    "Prior focusedUnderstanding": !prompt.includes("focusedUnderstanding"),
    "Prior decisionSignificance": !prompt.includes("decisionSignificance"),
    "Graph mutation instructions": !prompt.includes("addedNodes") && !prompt.includes("updatedNodes"),
    "Recommendation instructions": !prompt.includes("recommend what"),
  };

  for (const [name, passed] of Object.entries(boundaryChecks)) {
    const status = passed ? "NO" : "VIOLATION";
    console.log(`  ${name}: ${status}`);
  }

  // Schema validation capability
  const mockOutput = {
    currentView: "test",
    whatChanged: "test",
    remainingUncertainties: ["test"],
  };
  const schemaErrors = validateOutputSchema(mockOutput);
  console.log("\n--- Output schema ---");
  console.log(`Required fields: ${CURRENT_VIEW_SCHEMA.required.join(", ")}`);
  console.log(`Validation capability: ${schemaErrors.length === 0 ? "valid" : "errors"}`);

  // Prompt size
  console.log("\n--- Prompt size ---");
  console.log(`inputCharacterCount: ${prompt.length}`);

  // Live route
  console.log("\n--- Live route ---");
  console.log("node scripts/experimental/rto-derived-focused-current-view.mjs --live");

  // Inspect summary
  const allFragmentsOK = f2Loaded && f3Loaded;
  const relationshipOK = relationshipIncluded;
  const noViolations = Object.values(boundaryChecks).every((v) => v === true);

  console.log("\n=== SUMMARY ===");
  console.log(`Inspect live calls: 0`);
  console.log(`Fragments valid: ${allFragmentsOK ? "YES" : "NO"}`);
  console.log(`Boundary clean: ${noViolations ? "YES" : "VIOLATION DETECTED"}`);

  const passed = allFragmentsOK && relationshipOK && noViolations;
  console.log(`\nInspect result: ${passed ? "PASS" : "FAIL"}`);

  if (!passed) {
    console.log("\nApparatus cannot satisfy boundary without production changes.");
    console.log("F — APPARATUS CANNOT ISOLATE DERIVED VIEW");
    return null;
  }

  return { prompt, inputCharacterCount: prompt.length };
}

// ─── Live execution (exactly one model call) ──────────────────────────────────

async function executeLive() {
  const baseUrl = process.env.OLLAMA_BASE_URL;
  if (!baseUrl) {
    console.error("OLLAMA_BASE_URL not set. Cannot execute live mode.");
    process.exit(1);
  }
  if (baseUrl === "http://localhost:11434" || baseUrl === "http://127.0.0.1:11434") {
    console.error("Refuses localhost fallback. OLLAMA_BASE_URL=" + baseUrl);
    process.exit(1);
  }

  var z = (await import("zod")).z;

  const { structuredResult2, structuredResult3 } = await loadFragments();

  const prompt = buildCurrentViewPrompt(structuredResult2, structuredResult3);

  // Schema for live output validation
  const currentViewSchema = z.object({
    currentView: z.string().min(1),
    whatChanged: z.string().min(1),
    remainingUncertainties: z.array(z.string()),
  }).strict();

  const startedAt = Date.now();
  console.log("Live mode: sending to model...");

  const provider = (await import(path.resolve(__dirname, "../../lib/llm/provider.js"))).getProvider();
  const configEnv = await import(path.resolve(__dirname, "../../lib/config.js"));
  const modelName = configEnv.assertConfig().OLLAMA_MODEL;

  var raw = await provider.generateReconstruction(prompt, modelName);
  var elapsedMs = Date.now() - startedAt;

  console.log(`Model response received in ${elapsedMs}ms`);

  const parsedResult = currentViewSchema.parse(raw);

  // Validate no forbidden fields leaked in
  const schemaErrors = validateOutputSchema(parsedResult);
  if (schemaErrors.length > 0) {
    throw new Error(`Live output schema validation errors: ${schemaErrors.join("; ")}`);
  }

  await fs.mkdir(resultsDir, { recursive: true });

  const artifactPath = path.resolve(
    resultsDir,
    "rto-derived-focused-current-view-live.json"
  );

  const payload = {
    apparatus: "rto-derived-focused-current-view.mjs",
    experiment: "RTO.20A",
    artifactType: "LIVE RESULT — Derived focused current view",
    modelName: modelName,
    elapsedMs: elapsedMs,
    inputCharacterCount: prompt.length,
    fragment2Path: FRAGMENT_2_PATH,
    fragment3Path: FRAGMENT_3_PATH,
    knownRelationshipIncluded: true,
    wholeSituationGraphSupplied: false,
    centralCaseStatementSupplied: false,
    turnHistorySupplied: false,
    outputSchema: {
      currentView: typeof parsedResult.currentView === "string",
      whatChanged: typeof parsedResult.whatChanged === "string",
      remainingUncertainties: Array.isArray(parsedResult.remainingUncertainties),
    },
    derivedCurrentView: parsedResult,
  };

  await fs.writeFile(artifactPath, JSON.stringify(payload, null, 2));
  console.log(`\nLive result written to: ${artifactPath}`);
  console.log("\n=== Derived Current View ===");
  console.log(JSON.stringify(parsedResult, null, 2));

  return payload;
}

// ─── CLI entry point ──────────────────────────────────────────────────────────

async function main() {
  const args = process.argv.slice(2);

  // --live flag for exactly one live model call
  if (args.includes("--live")) {
    const result = await executeLive();
    return;
  }

  // Default: inspect-only, zero model calls
  console.log("RTO.20A — Derived Focused Current View");
  console.log("Run with --live for one live model call.\n");

  const result = await inspectApparatus();
  if (result === null) {
    process.exit(1);
  }
}

main().catch((error) => {
  console.error(error instanceof Error ? error.message : String(error));
  process.exit(1);
});