// score_runs.ts — CLI + I/O around the pure scoreRecord function.
// Reads data/evidence/YYYY/MM/DD/*.jsonl, writes scored-runs at the
// matching partition. Mirrors build_evidence_index.ts conventions:
// idempotent, schema-gated, receipt-emitting.

import { existsSync, readFileSync, mkdirSync, writeFileSync, readdirSync, statSync, appendFileSync } from "node:fs";
import { resolve, dirname } from "node:path";
import { spawnSync } from "node:child_process";

import { buildScoredRun } from "./scorer";
import { validateEvidenceRecord, type EvidenceRecord } from "../../auditor/schemas/distillation/evidence_record";
import { validateScoredRun } from "../../auditor/schemas/distillation/scored_run";
import { RECEIPT_SCHEMA_VERSION, validateReceipt, type Receipt, type FileReference } from "../../auditor/schemas/distillation/receipt";
import { canonicalSha256 } from "../../auditor/schemas/distillation/types";

const DEFAULT_ROOT = process.env.LH_DISTILL_ROOT ?? "/home/profit/lakehouse";

export interface ScoreOptions {
  root: string;
  recorded_at: string;
  dry_run?: boolean;
}

export interface ScoreSourceResult {
  source_file: string;
  rows_read: number;
  rows_written: number;
  rows_skipped: number;
  rows_deduped: number;
  by_category: Record<string, number>;
  output_files: string[];
}

export interface ScoreResult {
  sources: ScoreSourceResult[];
  totals: {
    rows_read: number;
    rows_written: number;
    rows_skipped: number;
    rows_deduped: number;
    by_category: Record<string, number>;
  };
  receipt: Receipt;
  receipt_path: string;
  scored_dir: string;
  skips_path: string;
}

function listEvidenceFiles(evidence_root: string): string[] {
  const out: string[] = [];
  if (!existsSync(evidence_root)) return out;
  for (const yyyy of readdirSync(evidence_root).sort()) {
    const yp = resolve(evidence_root, yyyy);
    if (!statSync(yp).isDirectory()) continue;
    for (const mm of readdirSync(yp).sort()) {
      const mp = resolve(yp, mm);
      if (!statSync(mp).isDirectory()) continue;
      for (const dd of readdirSync(mp).sort()) {
        const dp = resolve(mp, dd);
        if (!statSync(dp).isDirectory()) continue;
        for (const f of readdirSync(dp)) {
          if (f.endsWith(".jsonl")) out.push(resolve(dp, f));
        }
      }
    }
  }
  return out;
}

function sha256OfFile(path: string): string {
  const h = new Bun.CryptoHasher("sha256");
  h.update(readFileSync(path));
  return h.digest("hex");
}

function gitSha(root: string): string {
  const r = spawnSync("git", ["-C", root, "rev-parse", "HEAD"], { encoding: "utf8" });
  return r.status === 0 ? r.stdout.trim() : "0".repeat(40);
}
function gitBranch(root: string): string | undefined {
  const r = spawnSync("git", ["-C", root, "rev-parse", "--abbrev-ref", "HEAD"], { encoding: "utf8" });
  return r.status === 0 ? r.stdout.trim() : undefined;
}
function gitDirty(root: string): boolean {
  const r = spawnSync("git", ["-C", root, "status", "--porcelain"], { encoding: "utf8" });
  return r.status === 0 && r.stdout.trim().length > 0;
}

function loadSeenHashes(out_path: string): Set<string> {
  const seen = new Set<string>();
  if (!existsSync(out_path)) return seen;
  for (const line of readFileSync(out_path, "utf8").split("\n")) {
    if (!line) continue;
    try {
      const row = JSON.parse(line);
      if (row?.provenance?.sig_hash) seen.add(row.provenance.sig_hash);
    } catch { /* malformed — ignore */ }
  }
  return seen;
}

async function processEvidenceFile(
  ev_path: string,
  opts: ScoreOptions,
  scored_dir: string,
  skips_path: string,
): Promise<ScoreSourceResult> {
  // Output mirrors the input partition (YYYY/MM/DD/<source-stem>.jsonl)
  const partition = ev_path.match(/data\/evidence\/(\d{4}\/\d{2}\/\d{2})\//)?.[1] ?? "unpartitioned";
  const stem = ev_path.split("/").pop()!.replace(/\.jsonl$/, "");
  const out_path = resolve(scored_dir, partition, `${stem}.jsonl`);
  const out_relpath = `data/scored-runs/${partition}/${stem}.jsonl`;

  const result: ScoreSourceResult = {
    source_file: ev_path.replace(opts.root + "/", ""),
    rows_read: 0,
    rows_written: 0,
    rows_skipped: 0,
    rows_deduped: 0,
    by_category: { accepted: 0, partially_accepted: 0, rejected: 0, needs_human_review: 0 },
    output_files: [],
  };

  if (!opts.dry_run) mkdirSync(dirname(out_path), { recursive: true });

  const seen = loadSeenHashes(out_path);
  const lines = readFileSync(ev_path, "utf8").split("\n").filter(Boolean);
  const rowsToWrite: string[] = [];
  const skipsToWrite: string[] = [];

  for (let i = 0; i < lines.length; i++) {
    result.rows_read++;
    let evRow: any;
    try { evRow = JSON.parse(lines[i]); }
    catch (e) {
      result.rows_skipped++;
      skipsToWrite.push(JSON.stringify({
        evidence_file: result.source_file, line: i,
        errors: ["evidence not JSON: " + (e as Error).message.slice(0, 200)],
        recorded_at: opts.recorded_at,
      }));
      continue;
    }

    // Re-validate the evidence row before scoring — defensive; if a
    // malformed row slipped past Phase 2 it shouldn't poison Phase 3.
    const ev = validateEvidenceRecord(evRow);
    if (!ev.valid) {
      result.rows_skipped++;
      skipsToWrite.push(JSON.stringify({
        evidence_file: result.source_file, line: i,
        errors: ev.errors,
        recorded_at: opts.recorded_at,
      }));
      continue;
    }

    const scored = await buildScoredRun(ev.value as EvidenceRecord, out_relpath, i, opts.recorded_at);
    if (seen.has(scored.provenance.sig_hash)) {
      result.rows_deduped++;
      continue;
    }
    seen.add(scored.provenance.sig_hash);

    const sv = validateScoredRun(scored);
    if (!sv.valid) {
      result.rows_skipped++;
      skipsToWrite.push(JSON.stringify({
        evidence_file: result.source_file, line: i,
        errors: sv.errors.map(e => "scored_run schema: " + e),
        recorded_at: opts.recorded_at,
      }));
      continue;
    }

    rowsToWrite.push(JSON.stringify(sv.value));
    result.rows_written++;
    result.by_category[sv.value.category] = (result.by_category[sv.value.category] ?? 0) + 1;
  }

  if (!opts.dry_run) {
    if (rowsToWrite.length > 0) {
      appendFileSync(out_path, rowsToWrite.join("\n") + "\n");
      result.output_files.push(out_path);
    }
    if (skipsToWrite.length > 0) {
      mkdirSync(dirname(skips_path), { recursive: true });
      appendFileSync(skips_path, skipsToWrite.join("\n") + "\n");
    }
  }

  return result;
}

export async function scoreAll(opts: ScoreOptions): Promise<ScoreResult> {
  const evidence_root = resolve(opts.root, "data/evidence");
  const scored_dir = resolve(opts.root, "data/scored-runs");
  const skips_path = resolve(opts.root, "data/_kb/scoring_skips.jsonl");
  const reports_dir = resolve(opts.root, "reports/distillation");

  const started_ms = Date.now();
  const ev_files = listEvidenceFiles(evidence_root);
  const sources: ScoreSourceResult[] = [];

  for (const ev of ev_files) {
    sources.push(await processEvidenceFile(ev, opts, scored_dir, skips_path));
  }

  const totals = sources.reduce((acc, s) => ({
    rows_read: acc.rows_read + s.rows_read,
    rows_written: acc.rows_written + s.rows_written,
    rows_skipped: acc.rows_skipped + s.rows_skipped,
    rows_deduped: acc.rows_deduped + s.rows_deduped,
    by_category: {
      accepted: (acc.by_category.accepted ?? 0) + (s.by_category.accepted ?? 0),
      partially_accepted: (acc.by_category.partially_accepted ?? 0) + (s.by_category.partially_accepted ?? 0),
      rejected: (acc.by_category.rejected ?? 0) + (s.by_category.rejected ?? 0),
      needs_human_review: (acc.by_category.needs_human_review ?? 0) + (s.by_category.needs_human_review ?? 0),
    },
  }), { rows_read: 0, rows_written: 0, rows_skipped: 0, rows_deduped: 0, by_category: {} as Record<string, number> });

  const ended_at = new Date().toISOString();
  const duration_ms = Date.now() - started_ms;

  const input_files: FileReference[] = ev_files.map(p => ({
    path: p.replace(opts.root + "/", ""),
    sha256: sha256OfFile(p),
    bytes: statSync(p).size,
  }));
  const output_files: FileReference[] = [];
  for (const s of sources) {
    for (const out_path of s.output_files) {
      try {
        output_files.push({
          path: out_path.replace(opts.root + "/", ""),
          sha256: sha256OfFile(out_path),
          bytes: statSync(out_path).size,
        });
      } catch { /* dry-run path */ }
    }
  }

  const errors: string[] = [];
  const warnings: string[] = [];
  for (const s of sources) {
    if (s.rows_skipped > 0) warnings.push(`${s.source_file}: ${s.rows_skipped} skipped`);
  }

  const receipt: Receipt = {
    schema_version: RECEIPT_SCHEMA_VERSION,
    command: "bun run scripts/distillation/score_runs.ts" + (opts.dry_run ? " --dry-run" : ""),
    git_sha: gitSha(opts.root),
    git_branch: gitBranch(opts.root),
    git_dirty: gitDirty(opts.root),
    started_at: opts.recorded_at,
    ended_at,
    duration_ms,
    input_files,
    output_files,
    record_counts: {
      in: totals.rows_read,
      out: totals.rows_written,
      skipped: totals.rows_skipped,
      deduped: totals.rows_deduped,
      cat_accepted: totals.by_category.accepted ?? 0,
      cat_partially_accepted: totals.by_category.partially_accepted ?? 0,
      cat_rejected: totals.by_category.rejected ?? 0,
      cat_needs_human_review: totals.by_category.needs_human_review ?? 0,
    },
    validation_pass: totals.rows_skipped === 0,
    errors,
    warnings,
  };
  const rv = validateReceipt(receipt);
  if (!rv.valid) {
    receipt.errors.push(...rv.errors.map(e => "receipt schema: " + e));
    receipt.validation_pass = false;
  }

  const stamp = ended_at.replace(/[:.]/g, "-");
  const receipt_path = resolve(reports_dir, stamp, "receipt.json");
  if (!opts.dry_run) {
    mkdirSync(dirname(receipt_path), { recursive: true });
    writeFileSync(receipt_path, JSON.stringify(receipt, null, 2) + "\n");
  }

  return { sources, totals, receipt, receipt_path, scored_dir, skips_path };
}

async function cli() {
  const dry_run = process.argv.includes("--dry-run");
  const recorded_at = new Date().toISOString();
  const r = await scoreAll({ root: DEFAULT_ROOT, recorded_at, dry_run });

  console.log(`[score_runs] ${r.totals.rows_read} read · ${r.totals.rows_written} written · ${r.totals.rows_skipped} skipped · ${r.totals.rows_deduped} deduped${dry_run ? " (DRY RUN)" : ""}`);
  console.log(`[score_runs] categories: accepted=${r.totals.by_category.accepted} partial=${r.totals.by_category.partially_accepted} rejected=${r.totals.by_category.rejected} needs_human=${r.totals.by_category.needs_human_review}`);
  for (const s of r.sources) {
    const c = s.by_category;
    console.log(`  ${s.source_file}: read=${s.rows_read} wrote=${s.rows_written} acc=${c.accepted ?? 0} part=${c.partially_accepted ?? 0} rej=${c.rejected ?? 0} hum=${c.needs_human_review ?? 0}`);
  }
  if (!dry_run) console.log(`[score_runs] receipt: ${r.receipt_path}`);
  if (!r.receipt.validation_pass) process.exit(1);
}

if (import.meta.main) cli().catch(e => { console.error(e); process.exit(1); });