/**
 * detectFrontendMode — source monorepo vs client package detection.
 *
 * The /documentation scaffold-doc CLI generates DIFFERENT artifacts per mode
 * (in-place TSX wiring vs PageRegistry docs.* registry) — a wrong verdict
 * ships an orphan doc page, so the detection contract is pinned here.
 */
import { describe, it, expect, beforeEach, afterEach } from 'vitest'
import fs from 'node:fs'
import os from 'node:os'
import path from 'node:path'
import { detectFrontendMode, SMARTSTACK_WEB_PACKAGE } from '../detector.js'

let root: string

beforeEach(() => {
  root = fs.mkdtempSync(path.join(os.tmpdir(), 'fmode-'))
})

afterEach(() => {
  fs.rmSync(root, { recursive: true, force: true })
})

function write(rel: string, content: string): void {
  const abs = path.join(root, rel)
  fs.mkdirSync(path.dirname(abs), { recursive: true })
  fs.writeFileSync(abs, content)
}

describe('detectFrontendMode', () => {
  it('detects a client project from the @atlashub/smartstack dependency (with version)', async () => {
    write(
      'package.json',
      JSON.stringify({ name: 'gesa-web', dependencies: { [SMARTSTACK_WEB_PACKAGE]: '3.62.0', react: '^19.0.0' } }),
    )
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('client')
    expect(info.packageVersion).toBe('3.62.0')
  })

  it('detects the source monorepo from the package name', async () => {
    write('package.json', JSON.stringify({ name: SMARTSTACK_WEB_PACKAGE, version: '3.62.0' }))
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('source')
    expect(info.packageVersion).toBeNull()
  })

  it('the package.json dependency wins even without client file markers', async () => {
    // No src/extensions/componentRegistry.generated.ts — the dependency alone decides.
    write('package.json', JSON.stringify({ name: 'x-web', devDependencies: { [SMARTSTACK_WEB_PACKAGE]: '3.60.0' } }))
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('client')
    expect(info.packageVersion).toBe('3.60.0')
  })

  it('falls back to the source file markers when package.json is inconclusive', async () => {
    write('package.json', JSON.stringify({ name: 'weird-fork' }))
    write('src/i18n/config.ts', 'export {}')
    write('src/components/routing/DocRoutes.tsx', 'export {}')
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('source')
  })

  it('falls back to the client marker when package.json is inconclusive', async () => {
    write('package.json', JSON.stringify({ name: 'weird-fork' }))
    write('src/extensions/componentRegistry.generated.ts', '// stub')
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('client')
    expect(info.packageVersion).toBeNull()
  })

  it('a single source marker is NOT enough (both are required)', async () => {
    write('package.json', JSON.stringify({ name: 'weird-fork' }))
    write('src/i18n/config.ts', 'export {}')
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('unknown')
  })

  it('returns unknown with evidence when nothing is conclusive', async () => {
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('unknown')
    expect(info.packageVersion).toBeNull()
    expect(info.evidence.length).toBeGreaterThan(0)
  })

  it('survives an unreadable package.json (falls through to markers)', async () => {
    write('package.json', '{ not json')
    write('src/extensions/componentRegistry.generated.ts', '// stub')
    const info = await detectFrontendMode(root)
    expect(info.mode).toBe('client')
  })
})