/**
 * Canonical live-update experiment harness.
 *
 * Loads .env.local, validates Ollama configuration, invokes updateCase()
 * through the real production path, and captures the standard reasoning
 * checkpoints needed by reasoning experiments.
 *
 * Usage (from a test file):
 *   const { runLiveExperiment } = require("./tests/graph/live-update-experiment-helper.cjs");
 *
 *   const result = await runLiveExperiment({
 *     graph: /* SituationGraph fixture *\/,
 *     previousQuestion: "Is risk a hard constraint?",
 *     answer: "Risk matters more to me.",
 *   });
 */

const dotenv = require("dotenv");
dotenv.config({ path: ".env.local" });

function assertRequiredEnv(name) {
  const value = process.env[name];
  if (!value) {
    throw new Error(
      `Live experiment requires ${name}. Set it in .env.local.\n` +
      `Found: OLLAMA_BASE_URL=${process.env.OLLAMA_BASE_URL ?? "(missing)"}, ` +
      `OLLAMA_MODEL=${process.env.OLLAMA_MODEL ?? "(missing)"}`
    );
  }
  return value;
}

/**
 * Run one live experiment through the real updateCase() production path.
 *
 * @param {object} params
 * @param {object} params.graph       — SituationGraph fixture (must match situationGraphSchema)
 * @param {string} params.previousQuestion
 * @param {string} params.answer
 * @returns {Promise<object>} Checkpoints:
 *   - userSupportedMeaning    — extracted from answer meaning
 *   - possibleInference       — extracted from answer meaning
 *   - rawAnswerCategory       — deterministic category derived from raw answer text
 *   - proposedMeaningCategory — deterministic category derived from userSupportedMeaning
 *   - proposalValidation      — { success, errors }
 *   - compatibilityGuard      — { passed, warnings, violations }
 *   - graphMutation           — { nodes: [...], edges: [...] } | null
 *   - selectedQuestion        — { id?, question? } | null
 *   - behaviourSelection      — string | null
 *   - reasoningState          — { turnCount, health, phase, progress, unknownStatuses }
 */
async function runLiveExperiment({ graph, previousQuestion, answer }) {
  const baseUrl = assertRequiredEnv("OLLAMA_BASE_URL");
  const model   = assertRequiredEnv("OLLAMA_MODEL");

  if (baseUrl === "http://localhost:11434" || baseUrl === "http://127.0.0.1:11434") {
    throw new Error(
      `Live experiment harness refuses to use localhost fallback. ` +
      `OLLAMA_BASE_URL=${baseUrl}. Configure a real host in .env.local.`
    );
  }

  const { updateCase } = await import(
    "../../lib/graph/orchestrator.js"
  );

  const result = await updateCase({ situationGraph: graph, previousQuestion, answer });

  // Extract the standard checkpoints
  const answerMeaning  = result?.proposal?.answerMeaning || {};
  const rawAnswerCat   = _deriveCategory(answer);
  const supportedCat   = _deriveCategory(answerMeaning.userSupportedMeaning || "");

  return {
    userSupportedMeaning: answerMeaning.userSupportedMeaning ?? null,
    possibleInference:    answerMeaning.possibleInference    ?? null,
    rawAnswerCategory:    rawAnswerCat,
    proposedMeaningCategory: supportedCat,
    proposalValidation:   result?.proposalValidation ?? { success: false, errors: [] },
    compatibilityGuard:   result?.compatibilityApplied !== undefined
      ? { passed: result.compatibilityApplied, warnings: [], violations: [] }
      : { passed: false, warnings: [], violations: [] },
    graphMutation:        result?.appliedGraph
      ? { nodes: result.appliedGraph.nodes ?? null, edges: result.appliedGraph.edges ?? null }
      : null,
    selectedQuestion:     result?.proposal?.selectedQuestion ?? null,
    behaviourSelection:   result?.behaviourSelection ?? null,
    reasoningState:       _extractReasoningState(result),
  };
}

/**
 * Minimal deterministic category derivation from free-text (mirrors the production pipeline).
 */
function _deriveCategory(text) {
  if (!text || !text.trim()) return "none";

  const lower = text.toLowerCase();

  // Conditional patterns
  if (/normally\s+(?:avoid|skip|not\s+take|would\s+n't|can\'t)/i.test(lower) &&
      /(might|could|would\s+(?:accept|allow|take|do))/i.test(lower)) {
    return "conditional_tradeoff";
  }

  // Contrast / but patterns
  if (/but\s+i?\s*(don\'t|cannot|can\'t|won\'t|will\s+not)/i.test(lower)) {
    return "qualified_support";
  }

  // Explicit hard constraint
  if (/(hard\s+constraint|must\s+(?:not|never|always)|can\'?\s*t(?:o)\s*(?:not|be\s+able\s+to)|absolutely\s+cannot)/i.test(lower)) {
    return "hard_constraint";
  }

  // Strong preference / must positive
  if (/(must\s+(?:have|do|get)|absolutely\s+(?:need|require)|cannot\s+proceed\s+without)/i.test(lower)) {
    return "strong_preference";
  }

  // Relative importance
  if (/more\s+to\s+me|matters\s+more|higher\s+priority|top\s*priority/i.test(lower)) {
    return "relative_importance";
  }

  // Support / contraindicate
  if (/support(s)?\b|confirm(s)?\b|validates?\b/i.test(lower)) {
    return "supports_decision";
  }
  if (/contradicts?\b|against\s+it\b|i\s*don\'?\s*t\s*(?:think\s+so|agree)\b/i.test(lower)) {
    return "contradicts_decision";
  }

  return "cannot_determine";
}

function _extractReasoningState(result) {
  const rs = result?.reasoningState;
  if (!rs) return null;
  return {
    turnCount:     rs.turnCount      ?? null,
    health:        rs.health          ?? null,
    phase:         rs.phase           ?? null,
    progress:      rs.progress        ?? null,
    unknownStatuses: (rs.unknownStatuses || []).map(s => s.id + ":" + s.status),
  };
}

module.exports = { runLiveExperiment };