'use strict'

const assert = require('node:assert/strict')
const fs = require('node:fs')
const os = require('node:os')
const path = require('node:path')
const test = require('node:test')

const { resolveDataDir, migrateLegacyData, isInside } = require('./datadir')

// 用绝对路径字符串拼测试目录，避免依赖运行平台的盘符写法
const INSTALL = path.resolve('/scoreboard-install')
const LOCAL = path.resolve('/localappdata')

function makeRoot(t) {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'scoreboard-datadir-'))
  t.after(() => fs.rmSync(root, { recursive: true, force: true }))
  return root
}

function writeFile(file, text) {
  fs.mkdirSync(path.dirname(file), { recursive: true })
  fs.writeFileSync(file, text)
}

test('打包态默认数据目录落在 %LOCALAPPDATA%\\ScoreboardConsole\\data', () => {
  const info = resolveDataDir({
    values: { server: { dataDir: '' } },
    installDir: INSTALL,
    env: { LOCALAPPDATA: LOCAL },
    isPackaged: true
  })
  assert.equal(info.dir, path.join(LOCAL, 'ScoreboardConsole', 'data'))
  assert.equal(info.source, 'localappdata')
  assert.equal(info.passToServer, true)
  assert.equal(isInside(INSTALL, info.dir), false)
})

test('开发态不接管数据目录，也不给服务端加 -data', () => {
  const info = resolveDataDir({
    values: { server: { dataDir: '' } },
    installDir: INSTALL,
    env: { LOCALAPPDATA: LOCAL },
    isPackaged: false
  })
  assert.equal(info.dir, path.join(INSTALL, 'data'))
  assert.equal(info.passToServer, false)
})

test('配置了绝对路径就按配置值走', () => {
  const custom = path.resolve('/scoreboard-data')
  const info = resolveDataDir({
    values: { server: { dataDir: custom } },
    installDir: INSTALL,
    env: { LOCALAPPDATA: LOCAL },
    isPackaged: true
  })
  assert.equal(info.dir, custom)
  assert.equal(info.source, 'config')
  assert.equal(info.passToServer, true)
})

test('配置了相对路径按安装目录解析', () => {
  const info = resolveDataDir({
    values: { server: { dataDir: 'data' } },
    installDir: INSTALL,
    env: { LOCALAPPDATA: LOCAL },
    isPackaged: true
  })
  assert.equal(info.dir, path.join(INSTALL, 'data'))
  assert.equal(info.passToServer, true)
  assert.equal(isInside(INSTALL, info.dir), true)
})

test('缺 %LOCALAPPDATA% 时退回安装目录，不下发 -data', () => {
  const info = resolveDataDir({
    values: { server: {} },
    installDir: INSTALL,
    env: {},
    isPackaged: true
  })
  assert.equal(info.dir, path.join(INSTALL, 'data'))
  assert.equal(info.source, 'fallback')
  assert.equal(info.passToServer, false)
})

test('目标为空且旧目录有数据 → 整体迁移', (t) => {
  const root = makeRoot(t)
  const legacyDir = path.join(root, 'install', 'data')
  const targetDir = path.join(root, 'localappdata', 'ScoreboardConsole', 'data')
  writeFile(path.join(legacyDir, 'system.db'), 'db')
  writeFile(path.join(legacyDir, 'event_projs', 'default', 'event.db'), 'event')

  const lines = []
  const result = migrateLegacyData({ targetDir, legacyDir, log: (line) => lines.push(line) })

  assert.equal(result.migrated, true)
  assert.equal(result.reason, 'moved')
  assert.equal(fs.existsSync(legacyDir), false)
  assert.equal(fs.readFileSync(path.join(targetDir, 'system.db'), 'utf8'), 'db')
  assert.equal(fs.existsSync(path.join(targetDir, 'event_projs', 'default', 'event.db')), true)
  assert.match(lines.join('\n'), /已把旧数据从 .* 迁移到 /)
})

test('目标目录已存在但是空目录 → 照样迁移', (t) => {
  const root = makeRoot(t)
  const legacyDir = path.join(root, 'install', 'data')
  const targetDir = path.join(root, 'localappdata', 'ScoreboardConsole', 'data')
  writeFile(path.join(legacyDir, 'system.db'), 'db')
  fs.mkdirSync(targetDir, { recursive: true })

  const result = migrateLegacyData({ targetDir, legacyDir, log: () => {} })

  assert.equal(result.migrated, true)
  assert.equal(fs.readFileSync(path.join(targetDir, 'system.db'), 'utf8'), 'db')
  assert.equal(fs.existsSync(legacyDir), false)
})

test('两边都有数据 → 不动任何一边，只记日志', (t) => {
  const root = makeRoot(t)
  const legacyDir = path.join(root, 'install', 'data')
  const targetDir = path.join(root, 'localappdata', 'ScoreboardConsole', 'data')
  writeFile(path.join(legacyDir, 'system.db'), 'old')
  writeFile(path.join(targetDir, 'system.db'), 'new')

  const lines = []
  const result = migrateLegacyData({ targetDir, legacyDir, log: (line) => lines.push(line) })

  assert.equal(result.migrated, false)
  assert.equal(result.reason, 'both')
  assert.equal(fs.readFileSync(path.join(legacyDir, 'system.db'), 'utf8'), 'old')
  assert.equal(fs.readFileSync(path.join(targetDir, 'system.db'), 'utf8'), 'new')
  assert.match(lines.join('\n'), /都有数据/)
})

test('旧目录没有数据 / 目标已有数据 / 两边同路径 → 都不动作', (t) => {
  const root = makeRoot(t)
  const emptyLegacy = path.join(root, 'a', 'data')
  fs.mkdirSync(emptyLegacy, { recursive: true })
  assert.equal(
    migrateLegacyData({ targetDir: path.join(root, 'b', 'data'), legacyDir: emptyLegacy, log: () => {} }).reason,
    'no-legacy'
  )
  assert.equal(
    migrateLegacyData({ targetDir: path.join(root, 'c', 'data'), legacyDir: path.join(root, 'd', 'data'), log: () => {} }).reason,
    'no-legacy'
  )

  const legacyDir = path.join(root, 'e', 'data')
  const targetDir = path.join(root, 'f', 'data')
  writeFile(path.join(targetDir, 'system.db'), 'new')
  assert.equal(migrateLegacyData({ targetDir, legacyDir, log: () => {} }).reason, 'target-has-data')
  assert.equal(migrateLegacyData({ targetDir, legacyDir: targetDir, log: () => {} }).reason, 'same-dir')
})

test('迁移失败时旧数据原地不动', (t) => {
  const root = makeRoot(t)
  // 目标目录嵌在旧目录内部，rename 必然失败（EINVAL）
  const legacyDir = path.join(root, 'install', 'data')
  const targetDir = path.join(legacyDir, 'nested')
  writeFile(path.join(legacyDir, 'system.db'), 'db')

  const lines = []
  const result = migrateLegacyData({ targetDir, legacyDir, log: (line) => lines.push(line) })

  assert.equal(result.migrated, false)
  assert.equal(result.reason, 'failed')
  assert.equal(fs.readFileSync(path.join(legacyDir, 'system.db'), 'utf8'), 'db')
  assert.match(lines.join('\n'), /旧数据仍保留在/)
})

test('目标路径读不出来时按「可能有数据」处理，不做迁移', (t) => {
  const root = makeRoot(t)
  const legacyDir = path.join(root, 'install', 'data')
  writeFile(path.join(legacyDir, 'system.db'), 'db')
  // 目标目录的上级是个文件，readdir 会报 ENOTDIR
  const blocker = path.join(root, 'blocker')
  writeFile(blocker, 'not a dir')

  const lines = []
  const result = migrateLegacyData({
    targetDir: path.join(blocker, 'data'),
    legacyDir,
    log: (line) => lines.push(line)
  })

  assert.equal(result.migrated, false)
  assert.equal(result.reason, 'target-unreadable')
  assert.equal(fs.readFileSync(path.join(legacyDir, 'system.db'), 'utf8'), 'db')
  assert.match(lines.join('\n'), /跳过旧数据迁移/)
})

test('旧路径读不出来时不当成「没有旧数据」，要记一条日志', (t) => {
  const root = makeRoot(t)
  const targetDir = path.join(root, 'localappdata', 'ScoreboardConsole', 'data')
  fs.mkdirSync(targetDir, { recursive: true })
  // 旧目录的上级是个文件：readdir 报 ENOTDIR，等同于现场遇到 EACCES 这类「读不到」
  const blocker = path.join(root, 'blocker')
  writeFile(blocker, 'not a dir')

  const lines = []
  const result = migrateLegacyData({
    targetDir,
    legacyDir: path.join(blocker, 'data'),
    log: (line) => lines.push(line)
  })

  assert.equal(result.migrated, false)
  assert.equal(result.reason, 'legacy-unreadable')
  assert.match(lines.join('\n'), /读不到旧数据目录/)
})

test('确实没有旧数据时只返回 no-legacy，不写警告日志', (t) => {
  const root = makeRoot(t)
  const targetDir = path.join(root, 'localappdata', 'ScoreboardConsole', 'data')
  fs.mkdirSync(targetDir, { recursive: true })
  const legacyDir = path.join(root, 'install', 'data')
  fs.mkdirSync(legacyDir, { recursive: true })

  const lines = []
  const result = migrateLegacyData({ targetDir, legacyDir, log: (line) => lines.push(line) })

  assert.equal(result.migrated, false)
  assert.equal(result.reason, 'no-legacy')
  assert.deepEqual(lines, [])
})

// —— 以下是 Linux 分支：默认位置换成 XDG 的数据目录，理由与 Windows 一致——
// 必须落在安装目录之外，否则覆盖安装时会被卸载器连目录一起删掉。
test('Linux 打包态默认数据目录落在 $XDG_DATA_HOME/ScoreboardConsole/data', () => {
  const xdg = path.resolve('/xdg/data')
  const info = resolveDataDir({
    values: { server: { dataDir: '' } },
    installDir: INSTALL,
    env: { XDG_DATA_HOME: xdg, HOME: path.resolve('/home/operator') },
    isPackaged: true,
    platform: 'linux'
  })
  assert.equal(info.dir, path.join(xdg, 'ScoreboardConsole', 'data'))
  assert.equal(info.source, 'xdg')
  assert.equal(info.passToServer, true)
  assert.equal(isInside(INSTALL, info.dir), false)
})

test('Linux 没设 $XDG_DATA_HOME 时用 ~/.local/share', () => {
  const home = path.resolve('/home/operator')
  const info = resolveDataDir({
    values: { server: { dataDir: '' } },
    installDir: INSTALL,
    env: { HOME: home },
    isPackaged: true,
    platform: 'linux'
  })
  assert.equal(info.dir, path.join(home, '.local', 'share', 'ScoreboardConsole', 'data'))
  assert.equal(info.passToServer, true)
})

test('Linux 拿不到 $XDG_DATA_HOME 与 $HOME 时退回安装目录，不下发 -data', () => {
  const info = resolveDataDir({
    values: { server: {} },
    installDir: INSTALL,
    env: {},
    isPackaged: true,
    platform: 'linux'
  })
  assert.equal(info.dir, path.join(INSTALL, 'data'))
  assert.equal(info.source, 'fallback')
  assert.equal(info.passToServer, false)
})

test('Linux 开发态同样不接管，也不给服务端加 -data', () => {
  const home = path.resolve('/home/operator')
  const info = resolveDataDir({
    values: { server: { dataDir: '' } },
    installDir: INSTALL,
    env: { HOME: home },
    isPackaged: false,
    platform: 'linux'
  })
  assert.equal(info.dir, path.join(INSTALL, 'data'))
  assert.equal(info.passToServer, false)
})

test('Linux 上配置了 dataDir 一样按配置走（绝对路径 / 相对安装目录）', () => {
  const home = path.resolve('/home/operator')
  const absolute = path.resolve('/scoreboard-data')
  assert.equal(
    resolveDataDir({
      values: { server: { dataDir: absolute } },
      installDir: INSTALL,
      env: { HOME: home },
      isPackaged: true,
      platform: 'linux'
    }).dir,
    absolute
  )
  assert.equal(
    resolveDataDir({
      values: { server: { dataDir: 'data' } },
      installDir: INSTALL,
      env: { HOME: home },
      isPackaged: true,
      platform: 'linux'
    }).dir,
    path.join(INSTALL, 'data')
  )
})