import { useEffect, useState } from 'react'
import { useParams, useNavigate } from 'react-router-dom'
import {
  Card, Descriptions, Tag, Badge, Button, Space, Typography, Timeline, Input,
  message, Spin, Select, Row, Col, Modal, Form,
} from 'antd'
import {
  ArrowLeftOutlined, EditOutlined, LinkOutlined, TeamOutlined, UserSwitchOutlined, SyncOutlined,
} from '@ant-design/icons'
import {
  getMerchant, getMemberGroups, getMerchantNotes, addMerchantNote,
  updateFollowStatus, getLevelMap, getAssignableUsers, assignMerchant,
  updateMerchantClean, startTask, recheckMerchant,
  type MerchantClean, type GroupMember, type MerchantNote, type AssignableUser,
} from '../api'
import { useAppStore } from '../store'

const { Text, Title } = Typography
const { Option } = Select

const defaultLevelColor: Record<string, string> = { Hot: 'red', Warm: 'orange', Cold: 'blue' }

const followStatusLabels: Record<string, string> = {
  pending: '待跟进', contacted: '已联系', cooperating: '已合作', rejected: '已拒绝',
}
const followStatusBadge: Record<string, 'default' | 'processing' | 'success' | 'error'> = {
  pending: 'default', contacted: 'processing', cooperating: 'success', rejected: 'error',
}
const statusBadgeMap: Record<string, 'success' | 'error' | 'warning' | 'default'> = {
  valid: 'success', invalid: 'error', bot: 'warning', duplicate: 'default',
}
const sourceTypeColor: Record<string, string> = { web: 'blue', tg_channel: 'orange', github: 'geekblue' }

interface SourceInfo {
  source_type: string
  source_name: string
  source_url: string
}

function formatDateTime(dateStr: string) {
  return new Date(dateStr).toLocaleString('zh-CN')
}

export default function MerchantDetail() {
  const { id } = useParams<{ id: string }>()
  const navigate = useNavigate()
  const { isOperator, hasAction } = useAppStore()
  const [merchant, setMerchant] = useState<MerchantClean | null>(null)
  const [loading, setLoading] = useState(true)
  const [notes, setNotes] = useState<MerchantNote[]>([])
  const [noteInput, setNoteInput] = useState('')
  const [noteLoading, setNoteLoading] = useState(false)
  const [groups, setGroups] = useState<GroupMember[]>([])
  const [levelMap, setLevelMap] = useState<Record<string, { label: string; color: string; description: string }>>({})
  const [assignableUsers, setAssignableUsers] = useState<AssignableUser[]>([])
  // Edit modal
  const [editModalOpen, setEditModalOpen] = useState(false)
  const [editForm] = Form.useForm()
  const [editLoading, setEditLoading] = useState(false)

  useEffect(() => {
    getLevelMap().then(r => setLevelMap(r.data)).catch(() => {})
    getAssignableUsers().then(r => setAssignableUsers(r.data || [])).catch(() => {})
  }, [])

  const loadMerchant = (merchantId: number) => {
    getMerchant(merchantId).then(res => {
      const d = res.data as { source: string; data: MerchantClean }
      setMerchant(d.data)
      if (d.data.tg_username) {
        getMemberGroups(d.data.tg_username).then(r => setGroups(r.data || [])).catch(() => {})
      }
      getMerchantNotes(merchantId).then(r => setNotes(r.data || [])).catch(() => {})
    }).catch(() => {
      message.error('商户不存在')
      navigate('/merchants')
    })
  }

  useEffect(() => {
    if (!id) return
    setLoading(true)
    getMerchant(Number(id)).then(res => {
      const d = res.data as { source: string; data: MerchantClean }
      setMerchant(d.data)
      if (d.data.tg_username) {
        getMemberGroups(d.data.tg_username).then(r => setGroups(r.data || [])).catch(() => {})
      }
      getMerchantNotes(Number(id)).then(r => setNotes(r.data || [])).catch(() => {})
    }).catch(() => {
      message.error('商户不存在')
      navigate('/merchants')
    }).finally(() => setLoading(false))
  }, [id, navigate])

  const getLevelLabel = (key: string) => levelMap[key]?.label || key
  const getLevelColor = (key: string) => levelMap[key]?.color || defaultLevelColor[key] || 'default'

  const parseSources = (): SourceInfo[] => {
    if (!merchant) return []
    try {
      if (Array.isArray(merchant.all_sources)) return merchant.all_sources as SourceInfo[]
      if (typeof merchant.all_sources === 'string') return JSON.parse(merchant.all_sources)
    } catch { /* ignore */ }
    return []
  }

  const handleFollowStatusChange = async (val: string) => {
    if (!merchant) return
    try {
      await updateFollowStatus(merchant.id, val)
      setMerchant({ ...merchant, follow_status: val })
      message.success('跟进状态已更新')
    } catch {
      message.error('更新失败')
    }
  }

  const handleAssign = async (val: string) => {
    if (!merchant) return
    try {
      const res = await assignMerchant(merchant.id, val)
      setMerchant(res.data)
      message.success('分配成功')
    } catch {
      message.error('分配失败')
    }
  }

  const handleAddNote = async () => {
    if (!merchant || !noteInput.trim()) return
    setNoteLoading(true)
    try {
      await addMerchantNote(merchant.id, noteInput.trim())
      setNoteInput('')
      message.success('备注已添加')
      const res = await getMerchantNotes(merchant.id)
      setNotes(res.data || [])
    } catch {
      message.error('添加失败')
    } finally {
      setNoteLoading(false)
    }
  }

  const openEditModal = () => {
    if (!merchant) return
    editForm.setFieldsValue({
      merchant_name: merchant.merchant_name,
      industry_tag: merchant.industry_tag,
      website: merchant.website,
      email: merchant.email,
      phone: merchant.phone,
      remark: merchant.remark || '',
    })
    setEditModalOpen(true)
  }

  const handleEditSave = async () => {
    if (!merchant) return
    try {
      const values = await editForm.validateFields()
      setEditLoading(true)
      const res = await updateMerchantClean(merchant.id, values)
      setMerchant(res.data)
      message.success('商户信息已更新')
      setEditModalOpen(false)
    } catch {
      message.error('更新失败')
    } finally {
      setEditLoading(false)
    }
  }

  const handleCollectGroup = (username: string) => {
    Modal.confirm({
      title: `采集群 @${username}`,
      content: `将使用 TG 采集器采集群 @${username} 中的成员和联系方式。`,
      okText: '开始采集',
      onOk: async () => {
        try {
          await startTask({ plugin_name: 'tg_collector', target_group: username })
          message.success(`已启动对 @${username} 的采集任务`)
        } catch {
          message.error('启动采集失败')
        }
      },
    })
  }

  if (loading) return <div style={{ textAlign: 'center', padding: 80 }}><Spin size="large" /></div>
  if (!merchant) return null

  const sources = parseSources()

  return (
    <div style={{ maxWidth: 1200, margin: '0 auto' }}>
      {/* Header */}
      <div style={{ marginBottom: 20 }}>
        <Button type="link" icon={<ArrowLeftOutlined />} onClick={() => navigate('/merchants')}
          style={{ padding: 0, marginBottom: 12 }}>
          返回列表
        </Button>
        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
          <Space size="middle">
            <Title level={4} style={{ margin: 0 }}>
              <a href={`https://t.me/${merchant.tg_username}`} target="_blank" rel="noreferrer">
                @{merchant.tg_username}
              </a>
            </Title>
            {merchant.merchant_name && <Text type="secondary" style={{ fontSize: 16 }}>{merchant.merchant_name}</Text>}
            <Tag color={getLevelColor(merchant.level)}>{getLevelLabel(merchant.level)}</Tag>
            <Badge status={statusBadgeMap[merchant.status] ?? 'default'} text={merchant.status} />
          </Space>
          <Space>
            {hasAction('merchant_edit') && (
              <Button icon={<SyncOutlined />} onClick={async () => {
                try {
                  await recheckMerchant(merchant.id)
                  message.success('已标记为待重新检查')
                } catch { message.error('操作失败') }
              }}>重新检查</Button>
            )}
            {hasAction('merchant_edit') && (
              <Button icon={<EditOutlined />} onClick={openEditModal}>编辑</Button>
            )}
          </Space>
        </div>
      </div>

      <Row gutter={24}>
        {/* Left column */}
        <Col span={16}>
          {/* Basic info */}
          <Card title="基本信息" size="small" style={{ marginBottom: 16 }}>
            <Descriptions column={2} size="small">
              <Descriptions.Item label="TG链接">
                <a href={merchant.tg_link || `https://t.me/${merchant.tg_username}`} target="_blank" rel="noreferrer">
                  {merchant.tg_link || `https://t.me/${merchant.tg_username}`}
                </a>
              </Descriptions.Item>
              <Descriptions.Item label="行业">{merchant.industry_tag || '-'}</Descriptions.Item>
              <Descriptions.Item label="网站" span={2}>
                {merchant.website ? <a href={merchant.website} target="_blank" rel="noreferrer">{merchant.website}</a> : '-'}
              </Descriptions.Item>
              <Descriptions.Item label="邮箱">{merchant.email || '-'}</Descriptions.Item>
              <Descriptions.Item label="电话">{merchant.phone || '-'}</Descriptions.Item>
              <Descriptions.Item label="存活状态">
                {merchant.is_alive ? <Tag color="green">存活</Tag> : <Tag color="red">失效</Tag>}
              </Descriptions.Item>
              <Descriptions.Item label="最后检查">
                {merchant.last_checked_at ? formatDateTime(merchant.last_checked_at) : '-'}
              </Descriptions.Item>
              <Descriptions.Item label="创建时间">{formatDateTime(merchant.created_at)}</Descriptions.Item>
              <Descriptions.Item label="更新时间">{formatDateTime(merchant.updated_at)}</Descriptions.Item>
              {merchant.remark && (
                <Descriptions.Item label="备注" span={2}>{merchant.remark}</Descriptions.Item>
              )}
            </Descriptions>
          </Card>

          {/* Sources */}
          <Card title={`来源记录 (${sources.length})`} size="small" style={{ marginBottom: 16 }}>
            {sources.length === 0 ? <Text type="secondary">无来源记录</Text> : sources.map((src, idx) => (
              <div key={idx} style={{
                background: '#fafafa', border: '1px solid #f0f0f0', borderRadius: 6,
                padding: '10px 14px', marginBottom: 8,
              }}>
                <Row align="middle" gutter={8}>
                  <Col><Tag color={sourceTypeColor[src.source_type] ?? 'default'}>{src.source_type}</Tag></Col>
                  <Col flex="auto"><Text strong style={{ fontSize: 13 }}>{src.source_name || '未知来源'}</Text></Col>
                </Row>
                {src.source_url && (
                  <div style={{ marginTop: 6 }}>
                    <LinkOutlined style={{ color: '#1890ff', marginRight: 4 }} />
                    <a href={src.source_url} target="_blank" rel="noreferrer" style={{ fontSize: 12, wordBreak: 'break-all' }}>
                      {src.source_url}
                    </a>
                  </div>
                )}
              </div>
            ))}
          </Card>

          {/* Groups */}
          {groups.length > 0 && (
            <Card title={<><TeamOutlined /> 所属群/频道 ({groups.length})</>} size="small" style={{ marginBottom: 16 }}>
              {groups.map((gm, idx) => (
                <div key={idx} style={{
                  background: '#f6ffed', border: '1px solid #b7eb8f', borderRadius: 6,
                  padding: '8px 14px', marginBottom: 6,
                  display: 'flex', justifyContent: 'space-between', alignItems: 'center',
                }}>
                  <div>
                    <a href={`https://t.me/${gm.group_username}`} target="_blank" rel="noreferrer">
                      @{gm.group_username}
                    </a>
                    {gm.group_title && <Text type="secondary" style={{ marginLeft: 8 }}>{gm.group_title}</Text>}
                    <Tag color="green" style={{ marginLeft: 8 }}>{gm.source_type}</Tag>
                  </div>
                  {hasAction('task_start') && (
                    <Button size="small" onClick={() => handleCollectGroup(gm.group_username)}>采集此群</Button>
                  )}
                </div>
              ))}
            </Card>
          )}

          {/* TG Preview */}
          <Card title="TG 页面预览" size="small">
            <div style={{ border: '1px solid #f0f0f0', borderRadius: 6, overflow: 'hidden' }}>
              <iframe
                src={`https://t.me/${merchant.tg_username}`}
                style={{ width: '100%', height: 300, border: 'none' }}
                sandbox="allow-scripts allow-same-origin"
                title="TG Preview"
              />
            </div>
          </Card>
        </Col>

        {/* Right column */}
        <Col span={8}>
          {/* Status controls */}
          <Card title="跟进信息" size="small" style={{ marginBottom: 16 }}>
            <div style={{ marginBottom: 12 }}>
              <Text type="secondary" style={{ display: 'block', marginBottom: 4 }}>跟进状态</Text>
              <Select
                value={merchant.follow_status || 'pending'}
                style={{ width: '100%' }}
                onChange={handleFollowStatusChange}
                disabled={!hasAction('merchant_edit')}
              >
                {Object.entries(followStatusLabels).map(([k, v]) => (
                  <Option key={k} value={k}>
                    <Badge status={followStatusBadge[k] ?? 'default'} text={v} />
                  </Option>
                ))}
              </Select>
            </div>
            <div>
              <Text type="secondary" style={{ display: 'block', marginBottom: 4 }}>
                <UserSwitchOutlined /> 负责人
              </Text>
              <Select
                value={merchant.assigned_to || undefined}
                placeholder="未分配"
                style={{ width: '100%' }}
                onChange={handleAssign}
                allowClear
                disabled={!hasAction('merchant_assign')}
              >
                {assignableUsers.map(u => (
                  <Option key={u.username} value={u.username}>{u.nickname || u.username}</Option>
                ))}
              </Select>
            </div>
          </Card>

          {/* Notes timeline */}
          <Card title={`跟进备注 (${notes.length})`} size="small">
            {hasAction('merchant_edit') && (
              <div style={{ display: 'flex', gap: 8, marginBottom: 16 }}>
                <Input.TextArea
                  placeholder="输入备注..."
                  value={noteInput}
                  onChange={(e) => setNoteInput(e.target.value)}
                  autoSize={{ minRows: 2, maxRows: 4 }}
                  style={{ flex: 1 }}
                />
                <Button type="primary" loading={noteLoading} onClick={handleAddNote}
                  disabled={!noteInput.trim()} style={{ alignSelf: 'flex-end' }}>
                  添加
                </Button>
              </div>
            )}

            {notes.length === 0 ? (
              <Text type="secondary">暂无备注</Text>
            ) : (
              <Timeline
                items={notes.map(note => ({
                  children: (
                    <div>
                      <div style={{ fontSize: 13 }}>{note.content}</div>
                      <div style={{ fontSize: 11, color: '#999', marginTop: 4 }}>
                        {note.created_by} · {formatDateTime(note.created_at)}
                      </div>
                    </div>
                  ),
                }))}
              />
            )}
          </Card>
        </Col>
      </Row>

      {/* Edit Modal */}
      <Modal
        title="编辑商户信息"
        open={editModalOpen}
        onCancel={() => setEditModalOpen(false)}
        onOk={handleEditSave}
        confirmLoading={editLoading}
        okText="保存"
        cancelText="取消"
      >
        <Form form={editForm} layout="vertical">
          <Form.Item name="merchant_name" label="商户名"><Input /></Form.Item>
          <Form.Item name="industry_tag" label="行业标签"><Input /></Form.Item>
          <Form.Item name="website" label="网站"><Input /></Form.Item>
          <Form.Item name="email" label="邮箱"><Input /></Form.Item>
          <Form.Item name="phone" label="电话"><Input /></Form.Item>
          <Form.Item name="remark" label="备注"><Input.TextArea rows={3} /></Form.Item>
        </Form>
      </Modal>
    </div>
  )
}