#!/usr/bin/env bun
/**
 * One-shot migration: .github/srs/srs.json → D1.
 *
 * Run AFTER the catalog reconcile has filled `problems` (the import only
 * overlays SRS-owned fields — stage, next_review, defer_until — and inserts
 * attempts/topic counters). Re-runnable without duplicates: import-sourced
 * attempts are wiped and re-inserted, everything else upserts.
 *
 *   bun apps/api/scripts/import-srs.ts            # local D1 (wrangler dev state)
 *   bun apps/api/scripts/import-srs.ts --remote   # production D1
 *
 * Prints row counts; verify them against srs.json before deleting anything.
 */
import { $ } from "bun";
import { join } from "node:path";

const ROOT = join(import.meta.dir, "..", "..");
const API = join(ROOT, "api");
const REMOTE = process.argv.includes("--remote");

interface Attempt {
  date: string;
  kind: string;
  result: string;
}
interface Problem {
  issue: number;
  topic: number;
  difficulty: string;
  set: string;
  solved_on?: string;
  stage: string;
  next_review?: string;
  defer_until?: string;
  history: Attempt[];
}
interface State {
  problems: Record<string, Problem>;
  topics: Record<string, { misses: number; boost: boolean }>;
  drill_pool_used: number[];
}

const state: State = JSON.parse(
  await Bun.file(join(ROOT, ".github", "srs", "srs.json")).text(),
);

const q = (v: string | null | undefined) => (v == null ? "NULL" : `'${v}'`);
const lines: string[] = ["DELETE FROM attempts WHERE source = 'import';"];

let attempts = 0;
for (const [lc, p] of Object.entries(state.problems)) {
  lines.push(
    `UPDATE problems SET stage = ${q(p.stage)}, next_review = ${q(p.next_review ?? null)}, ` +
      `defer_until = ${q(p.defer_until ?? null)} WHERE lc_number = ${Number(lc)};`,
  );
  for (const a of p.history) {
    lines.push(
      `INSERT INTO attempts (lc_number, date, kind, result, source) ` +
        `VALUES (${Number(lc)}, ${q(a.date)}, ${q(a.kind)}, ${q(a.result)}, 'import');`,
    );
    attempts++;
  }
}
for (const [topic, t] of Object.entries(state.topics)) {
  lines.push(
    `UPDATE topics SET misses = ${t.misses}, boost = ${t.boost ? 1 : 0} WHERE issue = ${Number(topic)};`,
  );
}
for (const lc of state.drill_pool_used) {
  lines.push(`INSERT OR IGNORE INTO drill_pool_used (lc_number) VALUES (${lc});`);
}

const sqlPath = join(API, "migrations", ".import.sql");
await Bun.write(sqlPath, lines.join("\n") + "\n");
const flag = REMOTE ? "--remote" : "--local";
await $`bunx wrangler d1 execute srs ${flag} --file ${sqlPath}`.cwd(API);
await $`rm ${sqlPath}`;

const counts =
  await $`bunx wrangler d1 execute srs ${flag} --json --command ${"SELECT (SELECT COUNT(*) FROM problems) AS problems, (SELECT COUNT(*) FROM problems WHERE stage != 'new') AS laddered, (SELECT COUNT(*) FROM problems WHERE defer_until IS NOT NULL) AS deferred, (SELECT COUNT(*) FROM attempts WHERE source='import') AS imported_attempts, (SELECT COUNT(*) FROM topics) AS topics, (SELECT COUNT(*) FROM drill_pool_used) AS drills_used"}`
    .cwd(API)
    .json();

const expected = {
  json_problems: Object.keys(state.problems).length,
  json_attempts: attempts,
  json_laddered: Object.values(state.problems).filter((p) => p.stage !== "new").length,
  json_deferred: Object.values(state.problems).filter((p) => p.defer_until).length,
  json_topics: Object.keys(state.topics).length,
  json_drills_used: state.drill_pool_used.length,
};
console.log("expected from srs.json:", JSON.stringify(expected));
console.log("in D1:", JSON.stringify(counts[0]?.results?.[0] ?? counts));