import { useEffect, useMemo, useState } from 'react'
import { Card, Empty, Grid, Input, Modal, Select, Space, Switch, Tag, Typography } from '@arco-design/web-react'
import {
  IconCalendar,
  IconCheckCircleFill,
  IconDashboard,
  IconFile,
  IconRobot,
} from '@arco-design/web-react/icon'
import type { Project, ProjectWorkspace, TaskItem } from './projects/project-types'

const { Row, Col } = Grid
const { Title, Text, Paragraph } = Typography
const { TextArea } = Input

export type WorkspaceTaskUpdate = {
  originalProjectId: string
  nextProjectId: string
  taskId: string
  title: string
  summary: string
  tag: string
  completed: boolean
}

type WorkspaceTask = TaskItem & {
  project: Project
}

type TaskDraft = {
  title: string
  summary: string
  projectId: string
  tag: string
  completed: boolean
}

export function WorkspacePage({
  workspaces,
  onUpdateTask,
}: {
  workspaces: ProjectWorkspace[]
  onOpenTask: (project: Project, taskID: string) => void
  onUpdateTask: (update: WorkspaceTaskUpdate) => void
}) {
  const projects = workspaces.map((workspace) => workspace.project)
  const projectOptions = useMemo(() => workspaces.map((workspace) => workspace.project), [workspaces])
  const unfinishedTasks: WorkspaceTask[] = workspaces.flatMap((workspace) =>
    workspace.tasks
      .filter((task) => !task.completed)
      .map((task) => ({
        ...task,
        project: workspace.project,
      })),
  )
  const [editingTask, setEditingTask] = useState<WorkspaceTask | null>(null)
  const [draft, setDraft] = useState<TaskDraft>({ title: '', summary: '', projectId: '', tag: '', completed: false })
  const tagOptions = useMemo(() => {
    const selectedWorkspace = workspaces.find((workspace) => workspace.project.id === draft.projectId)
    return selectedWorkspace?.tags.filter((tag) => tag !== 'all' && tag !== '全部') ?? []
  }, [draft.projectId, workspaces])

  useEffect(() => {
    if (!editingTask) return
    setDraft({
      title: editingTask.title,
      summary: editingTask.summary,
      projectId: editingTask.project.id,
      tag: editingTask.tag,
      completed: editingTask.completed,
    })
  }, [editingTask])
  useEffect(() => {
    if (!draft.tag || tagOptions.includes(draft.tag)) return
    setDraft((value) => ({ ...value, tag: '' }))
  }, [draft.tag, tagOptions])
  const aiSessions = workspaces.flatMap((workspace) => workspace.aiSessions)
  const notes = workspaces.flatMap((workspace) => workspace.notes)
  const urgentProjects = projects.filter((project) => project.urgent).length
  const workspaceMetrics = [
    { title: '项目总数', value: projects.length, delta: `${urgentProjects} 个高优先级`, icon: <IconDashboard />, color: 'arcoblue' },
    { title: '未完成计划', value: unfinishedTasks.length, delta: '跨项目聚合', icon: <IconCheckCircleFill />, color: 'green' },
    { title: 'AI 会话', value: aiSessions.length, delta: '项目内上下文', icon: <IconRobot />, color: 'purple' },
    { title: '知识资料', value: notes.length, delta: '笔记与资料合计', icon: <IconFile />, color: 'cyan' },
  ]

  return (
    <div className="workspace-page overview-page">
      <div className="overview-head">
        <div>
          <Title heading={4}>工作台</Title>
          <Text type="secondary">所有项目的统一工作台，汇总项目任务、AI 会话和知识资产。</Text>
        </div>
      </div>

      <Row gutter={12} className="metric-row">
        {workspaceMetrics.map((metric) => (
          <Col span={24 / workspaceMetrics.length} key={metric.title}>
            <Card className="metric-card" bordered>
              <Space align="start">
                <Tag color={metric.color}>{metric.icon}</Tag>
                <div>
                  <Text type="secondary">{metric.title}</Text>
                  <Title heading={3}>{metric.value}</Title>
                  <Text className="metric-delta">{metric.delta}</Text>
                </div>
              </Space>
            </Card>
          </Col>
        ))}
      </Row>

      <Card className="queue-section" bordered>
        <div className="section-header">
          <Title heading={6}>未完成的计划</Title>
          <Tag color="arcoblue">{unfinishedTasks.length}</Tag>
        </div>
        {unfinishedTasks.length ? (
          <div className="workspace-task-list">
            {unfinishedTasks.map((task) => (
              <button key={`${task.project.id}-${task.id}`} className="workspace-task-card" onClick={() => setEditingTask(task)}>
                <div className="workspace-task-main">
                  <span className="workspace-task-title">
                    <IconCheckCircleFill />
                    {task.title}
                  </span>
                  <Paragraph ellipsis={{ rows: 2 }} type="secondary">
                    {task.summary || '暂无任务说明'}
                  </Paragraph>
                </div>
                <div className="workspace-task-meta">
                  <Tag color={task.project.urgent ? 'red' : 'arcoblue'}>{task.project.name}</Tag>
                  <Tag color="green">{task.tag || '-'}</Tag>
                  <span><IconCalendar /> {task.createdAt}</span>
                </div>
              </button>
            ))}
          </div>
        ) : (
          <Empty description="暂无未完成计划" />
        )}
      </Card>

      <Modal
        className="action-modal"
        title="编辑任务"
        visible={Boolean(editingTask)}
        onCancel={() => setEditingTask(null)}
        onOk={() => {
          if (!editingTask) return
          onUpdateTask({
            originalProjectId: editingTask.project.id,
            nextProjectId: draft.projectId,
            taskId: editingTask.id,
            title: draft.title.trim() || editingTask.title,
            summary: draft.summary.trim(),
            tag: draft.tag.trim(),
            completed: draft.completed,
          })
          setEditingTask(null)
        }}
      >
        <Space direction="vertical" size={12} className="action-form">
          <label>
            <Text>任务标题</Text>
            <Input value={draft.title} onChange={(title) => setDraft((value) => ({ ...value, title }))} />
          </label>
          <label>
            <Text>任务内容</Text>
            <TextArea rows={4} value={draft.summary} onChange={(summary) => setDraft((value) => ({ ...value, summary }))} />
          </label>
          <label>
            <Text>所属项目</Text>
            <Select
              showSearch
              value={draft.projectId}
              placeholder="选择项目"
              onChange={(projectId) => setDraft((value) => ({ ...value, projectId }))}
            >
              {projectOptions.map((project) => (
                <Select.Option key={project.id} value={project.id}>{project.name}</Select.Option>
              ))}
            </Select>
          </label>
          <label>
            <Text>所属标签</Text>
            <Select
              allowClear
              value={draft.tag || undefined}
              placeholder="不设置标签"
              onChange={(tag) => setDraft((value) => ({ ...value, tag: tag ?? '' }))}
            >
              {tagOptions.map((tag) => (
                <Select.Option key={tag} value={tag}>{tag}</Select.Option>
              ))}
            </Select>
          </label>
          <label className="action-switch">
            <Text>完成状态</Text>
            <Switch checked={draft.completed} checkedText="完成" uncheckedText="未完成" onChange={(completed) => setDraft((value) => ({ ...value, completed }))} />
          </label>
        </Space>
      </Modal>
    </div>
  )
}
