import { Alert, Button, Card, Empty, Input, Space, Table, Typography } from 'antd'
import { useCallback, useEffect, useMemo, useState } from 'react'
import { useSearchParams } from 'react-router-dom'
import type { ApiError } from '../lib/api'
import { isOrchestratorDbUnavailable, listRawNotes, type RawNoteRecord } from '../lib/content'

export default function RawNotesPage() {
  const [searchParams, setSearchParams] = useSearchParams()
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<ApiError | null>(null)
  const [notes, setNotes] = useState<RawNoteRecord[]>([])
  const [total, setTotal] = useState(0)

  const page = useMemo(() => {
    const raw = Number(searchParams.get('page') || '1')
    return Number.isFinite(raw) && raw > 0 ? raw : 1
  }, [searchParams])

  const pageSize = useMemo(() => {
    const raw = Number(searchParams.get('page_size') || '20')
    return Number.isFinite(raw) && raw > 0 ? Math.min(raw, 200) : 20
  }, [searchParams])

  const query = useMemo(() => String(searchParams.get('query') || '').trim(), [searchParams])
  const [queryInput, setQueryInput] = useState(query)

  useEffect(() => {
    setQueryInput(query)
  }, [query])

  const setParam = useCallback(
    (patch: Record<string, string | undefined>) => {
      const next = new URLSearchParams(searchParams)
      Object.entries(patch).forEach(([k, v]) => {
        const val = String(v || '').trim()
        if (val) next.set(k, val)
        else next.delete(k)
      })
      setSearchParams(next)
    },
    [searchParams, setSearchParams],
  )

  const loadList = useCallback(async () => {
    setLoading(true)
    setError(null)
    try {
      const res = await listRawNotes({
        limit: pageSize,
        offset: (page - 1) * pageSize,
        query: query || undefined,
      })
      setNotes(res.notes || [])
      setTotal(res.total || 0)
    } catch (e) {
      setError(e as ApiError)
    } finally {
      setLoading(false)
    }
  }, [page, pageSize, query])

  useEffect(() => {
    void loadList()
  }, [loadList])

  const columns = useMemo(
    () => [
      { title: 'ID', dataIndex: 'id', width: 90 },
      {
        title: '作者',
        dataIndex: 'author',
        width: 160,
        render: (v: unknown) => (v ? String(v) : '—'),
      },
      {
        title: 'URL',
        dataIndex: 'url',
        width: 340,
        ellipsis: true,
        render: (v: unknown) => {
          const url = String(v || '').trim()
          if (!url) return '—'
          return (
            <a href={url} target="_blank" rel="noreferrer">
              {url}
            </a>
          )
        },
      },
      {
        title: '内容',
        dataIndex: 'content',
        ellipsis: true,
        render: (v: unknown) => {
          const text = String(v || '').trim()
          return text ? <Typography.Text>{text}</Typography.Text> : '—'
        },
      },
      {
        title: '来源',
        dataIndex: 'source_platform',
        width: 120,
        render: (v: unknown) => (v ? String(v) : '—'),
      },
      {
        title: '创建时间',
        dataIndex: 'created_at',
        width: 200,
        render: (v: unknown) => (v ? String(v) : '—'),
      },
    ],
    [],
  )

  const dbMissing = isOrchestratorDbUnavailable(error)

  return (
    <div style={{ display: 'grid', gap: 16 }}>
      <Typography.Title level={3} style={{ margin: 0 }}>
        原始笔记库
      </Typography.Title>

      <Card
        title="GET /api/v1/content/raw-notes"
        extra={
          <Space wrap>
            <Input.Search
              allowClear
              placeholder="搜索 author / url / content"
              value={queryInput}
              onChange={(e) => setQueryInput(e.target.value)}
              onSearch={(value) => setParam({ query: value.trim() || undefined, page: '1' })}
              style={{ width: 320 }}
            />
            <Button onClick={loadList} disabled={loading}>
              刷新
            </Button>
          </Space>
        }
        loading={loading}
      >
        {dbMissing ? (
          <Empty
            image={Empty.PRESENTED_IMAGE_SIMPLE}
            description={
              <div style={{ maxWidth: 680 }}>
                <Typography.Text strong>内容库数据库不可用</Typography.Text>
                <Typography.Paragraph style={{ marginTop: 8, marginBottom: 0 }}>
                  服务端返回 503，通常表示 ORCHESTRATOR_DB_PATH 未配置、路径不存在或 DB 尚未初始化。
                  <br />
                  处理方式：
                  <br />
                  1）配置 ORCHESTRATOR_DB_PATH 指向可读的 sqlite 文件（默认 orchestrator/data/mvp.db）
                  <br />
                  2）初始化 DB：python Spider_XHS/orchestrator/db_init.py
                </Typography.Paragraph>
              </div>
            }
          />
        ) : error ? (
          <Alert
            type="error"
            showIcon
            message={error.status ? `HTTP ${error.status}` : '请求失败'}
            description={error.message}
            style={{ marginBottom: 16 }}
          />
        ) : null}

        <Table
          size="middle"
          rowKey="id"
          columns={columns}
          dataSource={notes}
          pagination={{
            current: page,
            pageSize,
            total,
            showSizeChanger: true,
            pageSizeOptions: [10, 20, 50, 100, 200],
            onChange: (nextPage, nextSize) => setParam({ page: String(nextPage), page_size: String(nextSize) }),
          }}
        />
      </Card>
    </div>
  )
}