/**
 * Analytical Table — system prompt builder.
 *
 * Combines the 12 universal standards with the agent's matrix row and
 * runbook into a self-describing system prompt (Std 3). Std 5 —
 * cost-appropriate prompts: callers pass an optional PromptScope
 * listing the standards their step engages; when given, the prompt is
 * trimmed. Multi-turn tool-use calls (the default here) omit scope
 * and receive the full prompt.
 */

import { STANDARDS_SUMMARY, type PromptScope } from '../../../standards.js';
import {
  AGENT_NAME,
  AGENT_VERSION,
  analyticalTableContract,
  analyticalTableMatrix,
} from './matrix.js';

interface OpPrinciple { readonly n: number; readonly text: string; }

const OPERATING_PRINCIPLES: readonly OpPrinciple[] = [
  { n: 1, text: 'structure data only. Do NOT compute metrics, run comparisons, or generate insights — those are downstream agents\' jobs.' },
  { n: 4, text: 'never invent values to fill gaps. A missing cell is a missing cell; record it in missingCells with a reason.' },
  { n: 4, text: 'every cell carries lineage back to the Pillar 1 source URL it came from.' },
  { n: 5, text: 'when you need a normalization rule, query the methodology library via find_methodologies(type="normalization_rule"). Apply only declared methodologies.' },
  { n: 7, text: 'assign honest confidence per cell — inherit upstream confidence when this step introduces no new uncertainty; lower it if you had to make a normalization judgement.' },
  { n: 8, text: 'flag missing data, ontology conflicts, mixed units, and methodology gaps explicitly.' },
  { n: 0, text: 'Intelligence-forbidden: do not fetch fresh data (connectors are Pillar 1\'s job), do not produce recommendations, do not make unsupported claims.' },
];

function renderUniversal(engaged?: readonly number[]): string {
  const set = engaged && engaged.length > 0 ? new Set(engaged) : null;
  return STANDARDS_SUMMARY
    .filter(s => !set || set.has(s.n))
    .map(s => `${s.n}. ${s.name} — ${s.gist}`)
    .join('\n');
}

function renderMatrix(): string {
  return Object.entries(analyticalTableMatrix)
    .map(([key, value]) => `${key.split('_')[0]}. ${value}`)
    .join('\n');
}

function renderRunbook(): string {
  return analyticalTableContract.runbook
    .map(s => `  ${s.n}. ${s.name} — ${s.description}`)
    .join('\n');
}

function renderPrinciples(engaged?: readonly number[]): string {
  const set = engaged && engaged.length > 0 ? new Set(engaged) : null;
  return OPERATING_PRINCIPLES
    .filter(p => p.n === 0 || !set || set.has(p.n))
    .map(p => (p.n === 0 ? `- ${p.text}` : `- Std ${p.n}: ${p.text}`))
    .join('\n');
}

export function buildSystemPrompt(scope?: PromptScope): string {
  const engaged = scope?.engagedStandards;
  const isScoped = !!(engaged && engaged.length > 0);
  const omitMatrix = scope?.omitMatrix ?? isScoped;
  const omitRunbook = scope?.omitRunbook ?? isScoped;
  const lines: string[] = [
    `You are the ${AGENT_NAME} agent (v${AGENT_VERSION}) — the first agent of the BID Intelligence pillar.`,
  ];
  if (isScoped) {
    lines.push(
      `All 12 universal operational standards govern your behavior. ` +
        (scope?.stepLabel ? `Current step: "${scope.stepLabel}". ` : '') +
        `Standards directly engaged by this step:`,
      renderUniversal(engaged),
    );
  } else {
    lines.push(
      `Your operation is bounded by the 12 universal operational standards every BID agent must satisfy, plus your per-agent matrix row.`,
      ``,
      `## Universal standards (canonical, apply to every agent)`,
      renderUniversal(),
    );
  }
  if (!omitMatrix) {
    lines.push(``, `## Your matrix row (your concrete fill-ins for the 12 standards)`, renderMatrix());
  }
  if (!omitRunbook) {
    lines.push(``, `## Your runbook (Std 6 — modular, repeatable, replayable)`, renderRunbook());
  }
  lines.push(``, `## Operating principles`, renderPrinciples(engaged));
  return lines.join('\n');
}