import test from 'node:test'
import assert from 'node:assert/strict'
import { readSource } from './helpers.ts'
import {
  ADMIN_THEME,
  ADMIN_THEME_KEYS,
  contrastRatio,
  cssVarName,
  isDarkSurface,
  relativeLuminance,
  tokenHex,
} from '../src/styles/theme.ts'

test('test_task_004_theme_tokens_normal_primary_path', () => {
  // 正常主路径（module 13 翻转）：侧边栏与内容区均为浅色，主色为蓝灰。
  assert.equal(isDarkSurface(ADMIN_THEME.sidebar), false, '侧边栏必须为浅色')
  assert.equal(isDarkSurface(ADMIN_THEME.sidebarDeep), false, '侧边栏加深面必须为浅色')
  assert.equal(isDarkSurface(ADMIN_THEME.bg), false, '内容区背景必须为亮色')
  assert.equal(isDarkSurface(ADMIN_THEME.border), false, '边框须为亮面中性色')
})

test('test_task_004_theme_tokens_normal_variant_input', () => {
  // 正常变体：主色为蓝灰基线、正文 token 自成一致体系。
  assert.equal(relativeLuminance(ADMIN_THEME.primary), relativeLuminance('#4f78a5'))
  assert.ok(contrastRatio(ADMIN_THEME.text, ADMIN_THEME.bg) >= 4.5, '正文/内容区需满足 WCAG AA 正文')
  assert.ok(contrastRatio(ADMIN_THEME.primary, ADMIN_THEME.bg) >= 3.0, '品牌色按钮须达到 3:1')
})

test('test_task_004_theme_tokens_normal_repeated_operation_is_idempotent', () => {
  // 正常重复：亮度与对比度计算幂等、无状态污染。
  assert.equal(relativeLuminance(ADMIN_THEME.bg), relativeLuminance(ADMIN_THEME.bg))
  assert.equal(isDarkSurface(ADMIN_THEME.sidebar), isDarkSurface(ADMIN_THEME.sidebar))
  assert.ok(contrastRatio(ADMIN_THEME.text, ADMIN_THEME.bg) === contrastRatio(ADMIN_THEME.text, ADMIN_THEME.bg))
})

test('test_task_004_theme_tokens_boundary_empty_input', () => {
  // 边界空值：token 表非空、无空值、无未知多余键、键集合稳定。
  assert.ok(ADMIN_THEME_KEYS.length >= 7, '必须覆盖侧边栏/内容区/正文等核心语义面')
  for (const key of ADMIN_THEME_KEYS) {
    assert.match(ADMIN_THEME[key], /^#[0-9a-fA-F]{6}$/, `${key} 须为 #rrggbb`)
  }
})

test('test_task_004_theme_tokens_boundary_single_item', () => {
  // 边界单元素：单个中性边界 token 与内容区可区分；侧栏为独立浅色面（不再要求深于内容区）。
  assert.notEqual(ADMIN_THEME.border, ADMIN_THEME.bg)
  assert.notEqual(ADMIN_THEME.sidebar, ADMIN_THEME.bg)
  assert.equal(isDarkSurface(ADMIN_THEME.sidebar), false, '侧栏须保持浅色')
})

test('test_task_004_theme_tokens_boundary_limit_or_missing_field', () => {
  // 边界上限：次要文本 muted 在内容区上仍可达 3:1；CSS 变量名映射无重复斜杠。
  assert.ok(contrastRatio(ADMIN_THEME.muted, ADMIN_THEME.bg) >= 3.0)
  assert.equal(cssVarName('sidebar'), '--admin-sidebar')
  assert.equal(cssVarName('sidebarDeep'), '--admin-sidebar-deep')
  assert.ok(!cssVarName('primary').includes('--admin-admin-'))
})

test('test_task_004_theme_tokens_invalid_input_rejected', () => {
  // 异常输入：非法 hex、未知 token 拒绝并报错；CSS 不得引用旧后台整份样式。
  assert.throws(() => relativeLuminance('#12'), /#rrggbb/)
  assert.throws(() => relativeLuminance('sidebar'), /#rrggbb/)
  assert.throws(() => tokenHex('unknown' as never), /未知 Admin 主题 token/)
  const css = readSource('src/styles/main.css')
  assert.equal(/@import/.test(css), false, 'main.css 不得 @import 旧后台整份样式')
})

test('test_task_004_theme_tokens_dependency_failure_returns_actionable_message', () => {
  // 依赖失败：token 与 main.css 渲染变量交叉校验必须一致（防双源漂移）。
  const css = readSource('src/styles/main.css')
  const missing = ADMIN_THEME_KEYS.filter((key) => {
    const tokenVar = `--admin-${key.replace(/[A-Z]/g, (c) => `-${c.toLowerCase()}`)}`
    return !css.includes(`${tokenVar}: ${ADMIN_THEME[key]}`)
  })
  assert.deepEqual(missing, [], `theme.ts 与 main.css 不一致，缺失变量: ${missing.join(', ')}`)
})