'use client'

import { useState, useEffect, useCallback } from 'react'
import { useRouter } from 'next/navigation'
import {
  Video,
  Search,
  SlidersHorizontal,
  ChevronDown,
  Upload,
  Bot,
  Users,
  Building2,
  Check,
  X,
  Loader2
} from 'lucide-react'
import { ResponsiveLayout } from '@/components/layout/ResponsiveLayout'
import { cn } from '@/lib/utils'
import { getPlatformInfo } from '@/lib/platforms'
import { api } from '@/lib/api'
import { USE_MOCK } from '@/contexts/AuthContext'
import { useSSE } from '@/contexts/SSEContext'
import { mapTaskToUI, type StepStatus, type StageSteps } from '@/lib/taskStageMapper'
import type { TaskResponse } from '@/types/task'

// UI 用任务数据（从 API 数据映射而来）
type Task = {
  id: string
  title: string
  description: string
  platform: string
  scriptStage: StageSteps
  videoStage: StageSteps
  buttonText: string
  buttonType: 'upload' | 'view' | 'fix'
  scriptColor: string
  videoColor: string
  filterCategory: 'pending' | 'reviewing' | 'rejected' | 'completed'
}

// Mock 数据（开发模式使用）
const mockTasks: Task[] = [
  {
    id: 'task-001', title: 'XX品牌618推广', description: '产品种草视频 · 时长要求 60-90秒 · 截止: 2026-02-10', platform: 'douyin',
    scriptStage: { submit: 'current', ai: 'pending', agency: 'pending', brand: 'pending' },
    videoStage: { submit: 'pending', ai: 'pending', agency: 'pending', brand: 'pending' },
    buttonText: '上传脚本', buttonType: 'upload', scriptColor: 'blue', videoColor: 'tertiary', filterCategory: 'pending',
  },
  {
    id: 'task-002', title: 'YY美妆新品', description: '口播测评 · 已上传视频 · 提交于: 今天 14:30', platform: 'xiaohongshu',
    scriptStage: { submit: 'done', ai: 'current', agency: 'pending', brand: 'pending' },
    videoStage: { submit: 'pending', ai: 'pending', agency: 'pending', brand: 'pending' },
    buttonText: '查看详情', buttonType: 'view', scriptColor: 'indigo', videoColor: 'tertiary', filterCategory: 'reviewing',
  },
  {
    id: 'task-003', title: 'ZZ饮品夏日', description: '探店Vlog · 发现2处问题 · 需修改后重新提交', platform: 'bilibili',
    scriptStage: { submit: 'done', ai: 'error', agency: 'pending', brand: 'pending' },
    videoStage: { submit: 'pending', ai: 'pending', agency: 'pending', brand: 'pending' },
    buttonText: '查看修改', buttonType: 'fix', scriptColor: 'coral', videoColor: 'tertiary', filterCategory: 'rejected',
  },
  {
    id: 'task-004', title: 'AA数码新品发布', description: '开箱测评 · 审核通过 · 可发布', platform: 'douyin',
    scriptStage: { submit: 'done', ai: 'done', agency: 'done', brand: 'done' },
    videoStage: { submit: 'done', ai: 'done', agency: 'done', brand: 'done' },
    buttonText: '查看详情', buttonType: 'view', scriptColor: 'green', videoColor: 'green', filterCategory: 'completed',
  },
  {
    id: 'task-008', title: 'EE食品试吃', description: '美食测评 · 脚本通过 · 待上传视频', platform: 'douyin',
    scriptStage: { submit: 'done', ai: 'done', agency: 'done', brand: 'done' },
    videoStage: { submit: 'current', ai: 'pending', agency: 'pending', brand: 'pending' },
    buttonText: '上传视频', buttonType: 'upload', scriptColor: 'green', videoColor: 'blue', filterCategory: 'pending',
  },
]

function mapTaskResponseToUI(task: TaskResponse): Task {
  const ui = mapTaskToUI(task)
  const buttonTypeMap: Record<string, 'upload' | 'view' | 'fix'> = {
    primary: 'upload', success: 'view', warning: 'fix', disabled: 'view',
  }
  return {
    id: task.id,
    title: task.name,
    description: `${task.project.name} · ${ui.statusLabel}`,
    platform: 'douyin', // 后端暂无平台字段，默认
    scriptStage: ui.scriptStage,
    videoStage: ui.videoStage,
    buttonText: ui.buttonText,
    buttonType: buttonTypeMap[ui.buttonType] || 'view',
    scriptColor: ui.scriptColor,
    videoColor: ui.videoColor,
    filterCategory: ui.filterCategory,
  }
}

// 步骤图标组件
function StepIcon({ status, icon }: { status: StepStatus; icon: 'upload' | 'bot' | 'users' | 'building' }) {
  const IconComponent = {
    upload: Upload,
    bot: Bot,
    users: Users,
    building: Building2,
  }[icon]

  const getStyle = () => {
    switch (status) {
      case 'done':
        return 'bg-accent-green'
      case 'current':
        return 'bg-accent-indigo'
      case 'error':
        return 'bg-accent-coral'
      default:
        return 'bg-bg-elevated border-[1.5px] border-border-subtle'
    }
  }

  const getIconColor = () => {
    if (status === 'done' || status === 'current' || status === 'error') return 'text-white'
    return 'text-text-tertiary'
  }

  return (
    <div className={cn('w-7 h-7 rounded-full flex items-center justify-center', getStyle())}>
      {status === 'done' && <Check size={14} className={getIconColor()} />}
      {status === 'current' && <Loader2 size={14} className={cn(getIconColor(), 'animate-spin')} />}
      {status === 'error' && <X size={14} className={getIconColor()} />}
      {status === 'pending' && <IconComponent size={14} className={getIconColor()} />}
    </div>
  )
}

// 进度条组件
function ProgressBar({ stage, color }: {
  stage: StageSteps
  color: string
}) {
  const steps = [
    { key: 'submit', label: '提交', icon: 'upload' as const, status: stage.submit },
    { key: 'ai', label: 'AI审核', icon: 'bot' as const, status: stage.ai },
    { key: 'agency', label: '代理商', icon: 'users' as const, status: stage.agency },
    { key: 'brand', label: '品牌', icon: 'building' as const, status: stage.brand },
  ]

  const getLineColor = (fromStatus: StepStatus) => {
    if (fromStatus === 'done') return 'bg-accent-green'
    return 'bg-border-subtle'
  }

  const getLabelColor = (status: StepStatus) => {
    if (status === 'done') return 'text-text-secondary'
    if (status === 'current') return 'text-accent-indigo font-semibold'
    if (status === 'error') return 'text-accent-coral font-semibold'
    return 'text-text-tertiary'
  }

  return (
    <div className="flex items-center w-full">
      {steps.map((step, index) => (
        <div key={step.key} className="flex items-center flex-1">
          <div className="flex flex-col items-center gap-1.5 w-14">
            <StepIcon status={step.status} icon={step.icon} />
            <span className={cn('text-[10px]', getLabelColor(step.status))}>{step.label}</span>
          </div>
          {index < steps.length - 1 && (
            <div className={cn('h-0.5 flex-1', getLineColor(step.status))} />
          )}
        </div>
      ))}
    </div>
  )
}

// 任务卡片组件
function TaskCard({ task, onClick }: { task: Task; onClick: () => void }) {
  const platform = getPlatformInfo(task.platform)

  const getStageColor = (color: string) => {
    switch (color) {
      case 'blue': return 'text-accent-blue'
      case 'indigo': return 'text-accent-indigo'
      case 'coral': return 'text-accent-coral'
      case 'green': return 'text-accent-green'
      case 'red': return 'text-accent-coral'
      default: return 'text-text-tertiary'
    }
  }

  const getButtonStyle = () => {
    switch (task.buttonType) {
      case 'upload':
        return 'bg-accent-green text-white'
      case 'fix':
        return 'bg-accent-coral text-white'
      default:
        return 'bg-transparent border-[1.5px] border-accent-indigo text-accent-indigo'
    }
  }

  return (
    <div
      className="bg-bg-card rounded-2xl overflow-hidden card-shadow cursor-pointer hover:bg-bg-elevated/30 transition-colors"
      onClick={onClick}
    >
      {platform && (
        <div className={`px-5 py-2 ${platform.bgColor} border-b ${platform.borderColor} flex items-center gap-2`}>
          <span className="text-base">{platform.icon}</span>
          <span className={`text-sm font-medium ${platform.textColor}`}>{platform.name}</span>
        </div>
      )}

      <div className="p-5 flex flex-col gap-4">
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-4">
            <div className="w-20 h-[60px] rounded-lg bg-[#1A1A1E] flex items-center justify-center flex-shrink-0">
              <Video className="w-6 h-6 text-text-tertiary" />
            </div>
            <div className="flex flex-col gap-1.5">
              <span className="text-base font-semibold text-text-primary">{task.title}</span>
              <span className="text-[13px] text-text-secondary">{task.description}</span>
            </div>
          </div>

          <button
            type="button"
            className={cn('px-5 py-2.5 rounded-[10px] text-sm font-semibold', getButtonStyle())}
            onClick={(e) => { e.stopPropagation(); onClick() }}
          >
            {task.buttonText}
          </button>
        </div>

      <div className="flex flex-col gap-3 pt-3">
        <div className="flex items-center gap-2">
          <span className={cn('text-xs font-semibold w-8', getStageColor(task.scriptColor))}>脚本</span>
          <div className="flex-1">
            <ProgressBar stage={task.scriptStage} color={task.scriptColor} />
          </div>
        </div>
        <div className="flex items-center gap-2">
          <span className={cn('text-xs font-semibold w-8', getStageColor(task.videoColor))}>视频</span>
          <div className="flex-1">
            <ProgressBar stage={task.videoStage} color={task.videoColor} />
          </div>
        </div>
      </div>
      </div>
    </div>
  )
}

type TaskFilter = 'all' | 'pending' | 'reviewing' | 'rejected' | 'completed'

const filterOptions: { value: TaskFilter; label: string }[] = [
  { value: 'all', label: '全部状态' },
  { value: 'pending', label: '待提交' },
  { value: 'reviewing', label: '审核中' },
  { value: 'rejected', label: '已驳回' },
  { value: 'completed', label: '已完成' },
]

// 骨架屏
function TaskSkeleton() {
  return (
    <div className="bg-bg-card rounded-2xl overflow-hidden card-shadow animate-pulse">
      <div className="px-5 py-2 bg-bg-elevated border-b border-border-subtle">
        <div className="h-4 w-20 bg-bg-page rounded" />
      </div>
      <div className="p-5 flex flex-col gap-4">
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-4">
            <div className="w-20 h-[60px] rounded-lg bg-bg-elevated" />
            <div className="flex flex-col gap-2">
              <div className="h-4 w-32 bg-bg-elevated rounded" />
              <div className="h-3 w-48 bg-bg-elevated rounded" />
            </div>
          </div>
          <div className="h-10 w-24 bg-bg-elevated rounded-[10px]" />
        </div>
        <div className="flex flex-col gap-3 pt-3">
          <div className="h-8 bg-bg-elevated rounded" />
          <div className="h-8 bg-bg-elevated rounded" />
        </div>
      </div>
    </div>
  )
}

export default function CreatorTasksPage() {
  const router = useRouter()
  const { subscribe } = useSSE()
  const [searchQuery, setSearchQuery] = useState('')
  const [filter, setFilter] = useState<TaskFilter>('all')
  const [showFilterDropdown, setShowFilterDropdown] = useState(false)
  const [tasks, setTasks] = useState<Task[]>([])
  const [isLoading, setIsLoading] = useState(true)
  const [total, setTotal] = useState(0)

  const loadTasks = useCallback(async () => {
    if (USE_MOCK) {
      setTasks(mockTasks)
      setTotal(mockTasks.length)
      setIsLoading(false)
      return
    }

    try {
      setIsLoading(true)
      const response = await api.listTasks(1, 50)
      const mapped = response.items.map(mapTaskResponseToUI)
      setTasks(mapped)
      setTotal(response.total)
    } catch (err) {
      console.error('加载任务失败:', err)
    } finally {
      setIsLoading(false)
    }
  }, [])

  useEffect(() => {
    loadTasks()
  }, [loadTasks])

  // SSE 实时更新
  useEffect(() => {
    const unsub1 = subscribe('task_updated', () => { loadTasks() })
    const unsub2 = subscribe('new_task', () => { loadTasks() })
    return () => { unsub1(); unsub2() }
  }, [subscribe, loadTasks])

  const handleTaskClick = (taskId: string) => {
    router.push(`/creator/task/${taskId}`)
  }

  const filteredTasks = tasks.filter(task => {
    const matchesSearch = searchQuery === '' ||
      task.title.toLowerCase().includes(searchQuery.toLowerCase()) ||
      task.description.toLowerCase().includes(searchQuery.toLowerCase())

    const matchesFilter = filter === 'all' || task.filterCategory === filter

    return matchesSearch && matchesFilter
  })

  const currentFilterLabel = filterOptions.find(opt => opt.value === filter)?.label || '全部状态'

  return (
    <ResponsiveLayout role="creator">
      <div className="flex flex-col gap-6 h-full">
        <div className="flex items-center justify-between flex-wrap gap-4">
          <div className="flex flex-col gap-1">
            <h1 className="text-2xl lg:text-[28px] font-bold text-text-primary">我的任务</h1>
            <p className="text-sm lg:text-[15px] text-text-secondary">
              {filter === 'all' ? `共 ${total} 个任务` : `${currentFilterLabel} ${filteredTasks.length} 个`}
            </p>
          </div>
          <div className="flex items-center gap-3">
            <div className="flex items-center gap-2 px-4 py-2.5 bg-bg-card rounded-xl border border-border-subtle">
              <Search className="w-[18px] h-[18px] text-text-secondary" />
              <input
                type="text"
                placeholder="搜索任务..."
                value={searchQuery}
                onChange={(e) => setSearchQuery(e.target.value)}
                className="bg-transparent text-sm text-text-primary placeholder-text-tertiary focus:outline-none w-32"
              />
            </div>
            <div className="relative">
              <button
                type="button"
                onClick={() => setShowFilterDropdown(!showFilterDropdown)}
                className={cn(
                  'flex items-center gap-2 px-4 py-2.5 rounded-xl border text-sm font-medium transition-colors',
                  filter !== 'all'
                    ? 'bg-accent-indigo/10 border-accent-indigo text-accent-indigo'
                    : 'bg-bg-card border-border-subtle text-text-secondary'
                )}
              >
                <SlidersHorizontal className="w-[18px] h-[18px]" />
                <span>{currentFilterLabel}</span>
                <ChevronDown className={cn('w-4 h-4 transition-transform', showFilterDropdown && 'rotate-180')} />
              </button>
              {showFilterDropdown && (
                <>
                  <div
                    className="fixed inset-0 z-10"
                    onClick={() => setShowFilterDropdown(false)}
                  />
                  <div className="absolute right-0 top-full mt-2 w-40 bg-bg-card rounded-xl border border-border-subtle card-shadow z-20 overflow-hidden">
                    {filterOptions.map((option) => (
                      <button
                        key={option.value}
                        type="button"
                        onClick={() => {
                          setFilter(option.value)
                          setShowFilterDropdown(false)
                        }}
                        className={cn(
                          'w-full px-4 py-3 text-left text-sm transition-colors',
                          filter === option.value
                            ? 'bg-accent-indigo/10 text-accent-indigo font-medium'
                            : 'text-text-primary hover:bg-bg-elevated'
                        )}
                      >
                        {option.label}
                      </button>
                    ))}
                  </div>
                </>
              )}
            </div>
          </div>
        </div>

        <div className="flex flex-col gap-4 flex-1 overflow-y-auto pr-2">
          {isLoading ? (
            <>
              <TaskSkeleton />
              <TaskSkeleton />
              <TaskSkeleton />
            </>
          ) : filteredTasks.length === 0 ? (
            <div className="flex flex-col items-center justify-center py-16 text-center">
              <Search className="w-12 h-12 text-text-tertiary mb-4" />
              <p className="text-text-secondary">没有找到匹配的任务</p>
              <p className="text-sm text-text-tertiary mt-1">尝试调整搜索条件或筛选状态</p>
            </div>
          ) : (
            filteredTasks.map((task) => (
              <TaskCard
                key={task.id}
                task={task}
                onClick={() => handleTaskClick(task.id)}
              />
            ))
          )}
        </div>
      </div>
    </ResponsiveLayout>
  )
}