import { IconClockCircle, IconEmail, IconFile, IconHome, IconLink, IconList, IconRobot, IconUserGroup } from '@arco-design/web-react/icon'
import type {
  ProjectWorkspaceDTO,
  WorkspaceAISessionDTO,
  WorkspaceChannelDTO,
  WorkspaceCronPlanDTO,
  WorkspaceInboxDTO,
  WorkspaceNoteSourceDTO,
  WorkspaceTaskDTO,
} from './projects'
import type { AISession, ChannelKey, CronJob, InboxItem, NoteSource, Project, ProjectChannel, ProjectWorkspace, TaskItem } from '../pages/projects/project-types'

const projectColors = ['#165DFF', '#00B42A', '#722ED1', '#FF7D00', '#14C9C9', '#F53F3F']

export function mapWorkspace(payload: ProjectWorkspaceDTO, index = 0): ProjectWorkspace {
  const project: Project = {
    id: payload.project.id,
    name: payload.project.name,
    identifier: payload.project.identifier ?? '',
    icon: payload.project.icon ?? '',
    background: payload.project.background ?? '',
    description: payload.project.description,
    short: projectIconLabel(payload.project.icon ?? '', payload.project.initials),
    badge: payload.project.unreadCount,
    urgent: payload.project.unreadCount > 20,
    color: projectColor(payload.project.background ?? '', index),
  }

  return {
    project,
    channels: payload.channels.filter((channel) => channel.type !== 'inbox').map(mapChannel),
    tags: payload.tags.map((tag) => tag.name),
    recentSessions: payload.recentSessions.map(mapAISession),
    inbox: payload.inbox.map(mapInbox),
    tasks: payload.tasks.map(mapTask),
    aiSessions: payload.aiSessions.map(mapAISession),
    notes: payload.notesSources.map(mapNoteSource),
    cronJobs: payload.cronPlans.map(mapCronPlan),
  }
}

function projectIconLabel(icon: string, fallback: string) {
  const trimmed = icon.trim()
  if (!trimmed) return fallback
  const chars = Array.from(trimmed)
  if (chars.length <= 2) return trimmed
  return chars.slice(0, 2).join('').toUpperCase()
}

function projectColor(background: string, index: number) {
  const trimmed = background.trim()
  if (trimmed.startsWith('#') || trimmed.startsWith('rgb') || trimmed.startsWith('hsl')) {
    return trimmed
  }
  return projectColors[index % projectColors.length]
}

function mapChannel(channel: WorkspaceChannelDTO): ProjectChannel {
  return {
    id: channel.id,
    key: mapChannelKey(channel.type, channel.id),
    label: channelLabel(channel),
    count: channel.count,
    icon: channelIcon(channel),
    url: channel.url,
    sortOrder: channel.sortOrder,
  }
}

function mapChannelKey(type: string, id = ''): ChannelKey {
  switch (type) {
    case 'inbox':
      return 'inbox'
    case 'tasks':
      return 'tasks'
    case 'ai_sessions':
      return 'ai'
    case 'notes_sources':
      return 'notes'
    case 'cron':
      return 'cron'
    case 'overview':
      return 'overview'
    default:
      return `custom:${id || type}`
  }
}

function channelLabel(channel: WorkspaceChannelDTO) {
  switch (channel.type) {
    case 'overview':
      return '概况'
    case 'inbox':
      return 'Inbox 消息流'
    case 'tasks':
      return '工作计划'
    case 'ai_sessions':
      return 'AI 会话'
    case 'notes_sources':
      return '笔记资料'
    case 'cron':
      return '计划任务'
    default:
      return channel.title
  }
}

function channelIcon(channel: WorkspaceChannelDTO) {
  switch (channel.type) {
    case 'overview':
      return <IconHome />
    case 'inbox':
      return <IconEmail />
    case 'tasks':
      return <IconList />
    case 'ai_sessions':
      return <IconRobot />
    case 'notes_sources':
      return <IconFile />
    case 'cron':
      return <IconClockCircle />
    default:
      return channel.icon === 'user' ? <IconUserGroup /> : <IconLink />
  }
}

function mapInbox(item: WorkspaceInboxDTO): InboxItem {
  return {
    id: item.id,
    title: item.title,
    meta: `来源：${item.source}`,
    owner: '系统',
    time: formatBackendDate(item.time),
    tag: item.tag || item.status,
    summary: item.summary,
    status: item.status,
  }
}

function mapTask(task: WorkspaceTaskDTO): TaskItem {
  return {
    id: task.id,
    title: task.title,
    owner: task.owner,
    progress: task.completed ? '100%' : '',
    due: task.due ? formatBackendDate(task.due) : '未设置',
    createdAt: formatBackendDate(task.createdAt),
    completedAt: task.completedAt ? formatBackendDate(task.completedAt) : '',
    duration: '',
    tag: task.tag || '',
    summary: task.summary,
    completed: task.completed,
  }
}

function formatBackendDate(value: string) {
  const date = parseBackendDate(value)
  if (!date) return '未知时间'

  const now = new Date()
  const today = startOfDay(now)
  const yesterday = new Date(today)
  yesterday.setDate(today.getDate() - 1)
  const dateDay = startOfDay(date)
  const time = `${pad(date.getHours())}:${pad(date.getMinutes())}`

  if (dateDay.getTime() === today.getTime()) return `今天 ${time}`
  if (dateDay.getTime() === yesterday.getTime()) return `昨天 ${time}`
  return `${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${time}`
}

function parseBackendDate(value: string) {
  if (!value) return null
  const normalized = value.includes('T') ? value : `${value.replace(' ', 'T')}Z`
  const date = new Date(normalized)
  return Number.isNaN(date.getTime()) ? null : date
}

function startOfDay(value: Date) {
  return new Date(value.getFullYear(), value.getMonth(), value.getDate())
}

function pad(value: number) {
  return String(value).padStart(2, '0')
}

function mapAISession(session: WorkspaceAISessionDTO): AISession {
  return {
    id: session.id,
    title: session.title,
    summary: session.summary,
    owner: 'AI',
    time: formatBackendDate(session.updatedAt),
  }
}

function mapNoteSource(note: WorkspaceNoteSourceDTO): NoteSource {
  return {
    id: note.id,
    title: note.title,
    type: note.kind === 'note' ? '笔记' : note.source,
    updated: formatBackendDate(note.updatedAt),
    owner: note.source,
    source: note.source,
  }
}

function mapCronPlan(plan: WorkspaceCronPlanDTO): CronJob {
  return {
    id: plan.id,
    name: plan.title,
    expr: plan.schedule,
    status: plan.enabled ? '运行中' : '暂停',
    lastRun: plan.lastResult,
    nextRun: plan.nextRun ? formatBackendDate(plan.nextRun) : '暂停中',
    owner: plan.owner,
    enabled: plan.enabled,
  }
}