import { describe, it, expect } from 'vitest'
import { mkdtempSync, rmSync, readFileSync, existsSync } from 'node:fs'
import { tmpdir } from 'node:os'
import path from 'node:path'
import { loadConfig } from '../src/config.js'

function tempDir(): string {
  return mkdtempSync(path.join(tmpdir(), 'rs-config-'))
}

describe('loadConfig', () => {
  it('creates data + artwork dirs and returns paths', () => {
    const dir = tempDir()
    try {
      const cfg = loadConfig({ DATA_DIR: dir })
      expect(cfg.dataDir).toBe(dir)
      expect(cfg.dbPath).toBe(path.join(dir, 'record-shop.db'))
      expect(cfg.port).toBe(3000)
      expect(existsSync(path.join(dir, 'artwork-cache'))).toBe(true)
      expect(cfg.sessionSecret).toMatch(/^[0-9a-f]{64}$/)
    } finally {
      rmSync(dir, { recursive: true, force: true })
    }
  })

  it('persists and reuses the session secret', () => {
    const dir = tempDir()
    try {
      const a = loadConfig({ DATA_DIR: dir })
      const b = loadConfig({ DATA_DIR: dir })
      expect(a.sessionSecret).toBe(b.sessionSecret)
      expect(readFileSync(path.join(dir, 'session-secret'), 'utf8')).toBe(a.sessionSecret)
    } finally {
      rmSync(dir, { recursive: true, force: true })
    }
  })

  it('honours PORT', () => {
    const dir = tempDir()
    try {
      expect(loadConfig({ DATA_DIR: dir, PORT: '8080' }).port).toBe(8080)
    } finally {
      rmSync(dir, { recursive: true, force: true })
    }
  })
})