/* Migration 8 — the roadmap loses its 'now' rows; chat turns get ids that
   two devices can share.

   A database as the previous build left it, including the state an earlier
   sync could produce: two units both marked 'now'. */

import { describe, it, expect, beforeEach, afterEach } from "vitest";
import { SqliteWasmDb } from "@app/db/sqlite-wasm-core.js";
import { migrate } from "@app/db/migrate.js";
import { readProgress } from "@app/domain/progress.js";
import type { Db } from "@app/db/types.js";

let db: Db;
beforeEach(async () => {
  db = await SqliteWasmDb.open({ memory: true });
  await migrate(db, 7);
  await db.exec(`
    INSERT INTO progress (unit_id, state, confidence, updated_at) VALUES
      ('1.1', 'done', 87, 100),
      ('1.2', 'now', 40, 300),
      ('1.3', 'now', 10, 200),
      ('1.4', 'todo', 0, 0);
    INSERT INTO chat (id, role, body, created_at, updated_at) VALUES
      (1, 'user', 'Start unit 1.1.', 0, 0),
      (2, 'assistant', 'first', 0, 0),
      (10, 'assistant', 'tenth', 0, 0),
      (11, 'user', 'later', 500, 500);
    INSERT INTO tombstone (tbl, pk, updated_at) VALUES ('chat', '9', 400);
  `);
  await migrate(db);
});
afterEach(async () => {
  await db.close();
});

describe("migration 8", () => {
  it("keeps what is true of each unit, and nothing about being current", async () => {
    expect(await db.all("SELECT unit_id, done, confidence, updated_at FROM progress ORDER BY unit_id")).toEqual([
      { unit_id: "1.1", done: 1, confidence: 87, updated_at: 100 },
      { unit_id: "1.2", done: 0, confidence: 40, updated_at: 300 },
      { unit_id: "1.3", done: 0, confidence: 10, updated_at: 200 },
      { unit_id: "1.4", done: 0, confidence: 0, updated_at: 0 },
    ]);
  });

  it("puts him where he most recently was, as exactly as new as that was", async () => {
    expect(await db.get("SELECT v, updated_at FROM meta WHERE k = 'road.unit'")).toEqual({
      v: "1.2",
      updated_at: 300,
    });
    expect((await readProgress(db)).current).toBe("1.2");
  });

  it("gives every turn a text id and keeps the transcript in the order it was written", async () => {
    const turns = await db.all<{ id: string; body: string }>("SELECT id, body FROM chat ORDER BY created_at, id");
    expect(turns.map((t) => t.body)).toEqual(["Start unit 1.1.", "first", "tenth", "later"]);
    for (const t of turns) expect(t.id).toMatch(/^legacy:[0-9a-f-]{36}:\d{10}$/);
  });

  it("renames a chat tombstone the same way", async () => {
    const device = (await db.get<{ v: string }>("SELECT v FROM meta WHERE k = 'sync.device'"))!.v;
    expect(await db.all("SELECT pk, updated_at FROM tombstone WHERE tbl = 'chat'")).toEqual([
      // As JSON, once migration 9 has written keys in protocol 2's form.
      { pk: JSON.stringify([`legacy:${device}:0000000009`]), updated_at: 400 },
    ]);
  });

  it("names this install without stamping it", async () => {
    expect(await db.get("SELECT updated_at FROM meta WHERE k = 'sync.device'")).toEqual({ updated_at: 0 });
  });

  it("creates the learner-model tables empty", async () => {
    for (const tbl of ["evidence", "confusion", "phase_ledger"]) {
      expect(await db.get(`SELECT count(*) AS n FROM ${tbl}`), tbl).toEqual({ n: 0 });
    }
  });
});

describe("the new roadmap model", () => {
  it("does not un-finish a unit that is revisited", async () => {
    const { goToUnit } = await import("@app/domain/progress.js");
    await goToUnit(db, await readProgress(db), "1.1");
    const p = await readProgress(db);
    expect(p.current).toBe("1.1");
    expect(p.done["1.1"]).toBe(true);
  });

  it("finishes the current unit and moves on in one step", async () => {
    const { advanceUnit } = await import("@app/domain/progress.js");
    const next = await advanceUnit(db, await readProgress(db));
    const p = await readProgress(db);
    expect(next).toBe("1.3");
    expect(p.current).toBe("1.3");
    expect(p.done["1.2"]).toBe(true);
  });
});