/**
 * Tests for the Inventory Manager database layer (db.js).
 *
 * Uses a temporary on-disk SQLite file per test to exercise real SQL
 * without touching production data.  The DB_PATH env var is set BEFORE
 * the dynamic import so better-sqlite3 opens the right file.
 */

import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import fs from 'fs';
import os from 'os';
import path from 'path';

// ── helpers ────────────────────────────────────────────────────────────

/** Create a fresh temp DB path and set the env var before importing db.js */
async function createTestDb() {
  const tmp = path.join(os.tmpdir(), `inv-test-${Date.now()}-${Math.random().toString(36).slice(2)}.db`);
  process.env.DB_PATH = tmp;

  // Use a cache-buster query string so Node gives us a fresh module
  const mod = await import(`../db.js?t=${Date.now()}-${Math.random()}`);
  return { mod, tmp };
}

function cleanup(tmp) {
  try { fs.unlinkSync(tmp); } catch { /* ignore */ }
  try { fs.unlinkSync(tmp + '-wal'); } catch { /* ignore */ }
  try { fs.unlinkSync(tmp + '-shm'); } catch { /* ignore */ }
}

// ── tests ──────────────────────────────────────────────────────────────

describe('db – item persistence', () => {
  let db, tmp;

  beforeEach(async () => {
    ({ mod: db, tmp } = await createTestDb());
  });

  afterEach(() => {
    try { db.closeDb(); } catch { /* already closed */ }
    cleanup(tmp);
  });

  it('saveItems + loadItems round-trips item data', () => {
    const items = [
      { name: 'minecraft:diamond', count: 64, displayName: 'Diamond' },
      { name: 'minecraft:iron_ingot', count: 128, displayName: 'Iron Ingot' },
    ];
    db.saveItems(items);

    const loaded = db.loadItems();
    expect(loaded).toHaveLength(2);

    // loadItems returns ORDER BY count DESC
    expect(loaded[0].name).toBe('minecraft:iron_ingot');
    expect(loaded[0].count).toBe(128);
    expect(loaded[1].name).toBe('minecraft:diamond');
    expect(loaded[1].count).toBe(64);
  });

  it('saveItems upserts — updates existing rows instead of duplicating', () => {
    db.saveItems([{ name: 'minecraft:diamond', count: 10, displayName: 'Diamond' }]);
    db.saveItems([{ name: 'minecraft:diamond', count: 99, displayName: 'Diamond' }]);

    const loaded = db.loadItems();
    expect(loaded).toHaveLength(1);
    expect(loaded[0].count).toBe(99);
  });
});

describe('db – state key-value store', () => {
  let db, tmp;

  beforeEach(async () => {
    ({ mod: db, tmp } = await createTestDb());
  });

  afterEach(() => {
    try { db.closeDb(); } catch { /* already closed */ }
    cleanup(tmp);
  });

  it('saveState + loadState round-trips JSON', () => {
    db.saveState('smeltingPaused', true);
    expect(db.loadState('smeltingPaused')).toBe(true);

    db.saveState('disabledRecipes', { 'minecraft:iron_ingot': true });
    expect(db.loadState('disabledRecipes')).toEqual({ 'minecraft:iron_ingot': true });
  });

  it('loadState returns defaultValue when key missing', () => {
    expect(db.loadState('nonexistent', 42)).toBe(42);
    expect(db.loadState('nonexistent')).toBeNull();
  });
});

describe('db – furnace persistence', () => {
  let db, tmp;

  beforeEach(async () => {
    ({ mod: db, tmp } = await createTestDb());
  });

  afterEach(() => {
    try { db.closeDb(); } catch { /* already closed */ }
    cleanup(tmp);
  });

  it('saveFurnaces + loadFurnaces round-trips furnace status', () => {
    const furnaces = {
      'minecraft:furnace_0': {
        active: true,
        type: 'minecraft:furnace',
        input: { name: 'minecraft:raw_iron', count: 8 },
        fuel: { name: 'minecraft:coal', count: 3 },
        output: null,
      },
    };

    db.saveFurnaces(furnaces);
    const loaded = db.loadFurnaces();

    expect(loaded['minecraft:furnace_0']).toBeDefined();
    expect(loaded['minecraft:furnace_0'].active).toBe(true);
    expect(loaded['minecraft:furnace_0'].input.name).toBe('minecraft:raw_iron');
  });
});

describe('db – alert persistence', () => {
  let db, tmp;

  beforeEach(async () => {
    ({ mod: db, tmp } = await createTestDb());
  });

  afterEach(() => {
    try { db.closeDb(); } catch { /* already closed */ }
    cleanup(tmp);
  });

  it('saveAlerts + loadAlerts round-trips triggered alerts', () => {
    db.saveAlerts([
      { item: 'minecraft:diamond', triggered: true, current: 5, threshold: 10 },
      { item: 'minecraft:coal', triggered: false, current: 200, threshold: 50 },
    ]);

    const loaded = db.loadAlerts();
    // loadAlerts only returns triggered=1
    expect(loaded).toHaveLength(1);
    expect(loaded[0].item).toBe('minecraft:diamond');
    expect(loaded[0].triggered).toBe(true);
    expect(loaded[0].current).toBe(5);
    expect(loaded[0].threshold).toBe(10);
  });
});

describe('db – item history', () => {
  let db, tmp;

  beforeEach(async () => {
    ({ mod: db, tmp } = await createTestDb());
  });

  afterEach(() => {
    try { db.closeDb(); } catch { /* already closed */ }
    cleanup(tmp);
  });

  it('getHistory returns recorded snapshots ordered newest-first', () => {
    // recordItemHistory is throttled (5-min internal cooldown), so we
    // call it twice — first call records, second is throttled.
    db.recordItemHistory([
      { name: 'minecraft:diamond', count: 64 },
      { name: 'minecraft:iron_ingot', count: 128 },
    ]);

    const history = db.getHistory('minecraft:diamond', 10);
    expect(history.length).toBeGreaterThanOrEqual(1);
    expect(history[0].count).toBe(64);
  });

  it('getHistorySummary groups by timestamp', () => {
    db.recordItemHistory([
      { name: 'a', count: 10 },
      { name: 'b', count: 20 },
    ]);

    const summary = db.getHistorySummary();
    expect(summary.length).toBeGreaterThanOrEqual(1);
    expect(summary[0].total).toBe(30); // 10 + 20
  });
});

describe('db – full state round-trip', () => {
  let db, tmp;

  beforeEach(async () => {
    ({ mod: db, tmp } = await createTestDb());
  });

  afterEach(() => {
    try { db.closeDb(); } catch { /* already closed */ }
    cleanup(tmp);
  });

  it('saveFullState + flushPendingSave + loadFullState restores everything', () => {
    const state = {
      inventoryState: {
        itemList: [
          { name: 'minecraft:diamond', count: 64, displayName: 'Diamond' },
        ],
        grandTotal: 64,
        chestCount: 2,
        totalSlots: 54,
        usedSlots: 1,
        freeSlots: 53,
        usedRatio: 0.02,
        dropperOk: true,
        barrelOk: false,
        furnaceCount: 1,
        furnaceStatus: {
          'furnace_0': { active: false, type: 'minecraft:furnace', input: null, fuel: null, output: null },
        },
        droppers: ['dropper_0'],
      },
      activityState: { lastScan: 12345 },
      alertsState: [{ item: 'minecraft:coal', triggered: true, current: 3, threshold: 10 }],
      smeltingPaused: false,
      disabledRecipes: { 'minecraft:charcoal': true },
      smeltableRecipes: { 'minecraft:raw_iron': 'minecraft:iron_ingot' },
      craftableRecipes: [{ output: 'minecraft:chest', count: 1, slots: { 1: 'minecraft:planks' } }],
      craftTurtleOk: true,
    };

    db.saveFullState(state);
    db.flushPendingSave(); // force the debounced write

    const restored = db.loadFullState();
    expect(restored.inventoryState.itemList).toHaveLength(1);
    expect(restored.inventoryState.itemList[0].name).toBe('minecraft:diamond');
    expect(restored.inventoryState.grandTotal).toBe(64);
    expect(restored.smeltingPaused).toBe(false);
    expect(restored.disabledRecipes).toEqual({ 'minecraft:charcoal': true });
    expect(restored.craftTurtleOk).toBe(true);
    expect(restored.alertsState).toHaveLength(1);
    expect(restored.alertsState[0].item).toBe('minecraft:coal');
  });
});