import { useEffect, useMemo, useState } from "react"
import { useNavigate, useSearch } from "@tanstack/react-router"

import { Input } from "@/shared/ui/input"
import { Pagination } from "@/shared/ui/pagination"

import type { SelectionResults, SelectionSignal } from "../api/selection.types"
import { SignalDetailPanel } from "./signal-detail-panel"
import { SignalRecordList } from "./signal-record-list"
import {
  getSignalKey,
  matchesCategory,
  signalCategoryOptions,
  type SignalCategoryFilter,
} from "./selection-presentation"
import { SignalTable } from "./signal-table"

const PAGE_SIZE_OPTIONS = [5, 10, 20] as const

interface SelectionResultsWorkbenchProps {
  result: SelectionResults
}

export function SelectionResultsWorkbench({
  result,
}: SelectionResultsWorkbenchProps) {
  const search = useSearch({ from: "/_workspace/selection" })
  const navigate = useNavigate({ from: "/selection" })
  const [query, setQuery] = useState("")
  const [category, setCategory] = useState<SignalCategoryFilter>("all")
  const [selectedKey, setSelectedKey] = useState<string | null>(null)
  const [expandedKeys, setExpandedKeys] = useState<ReadonlySet<string>>(
    new Set(),
  )

  const filteredSignals = useMemo(() => {
    const normalized = query.trim().toLowerCase()
    return result.signals.filter((signal) => {
      const matchesQuery =
        normalized.length === 0 ||
        signal.name.toLowerCase().includes(normalized) ||
        signal.ts_code.toLowerCase().includes(normalized)
      return matchesQuery && matchesCategory(signal, category)
    })
  }, [category, query, result.signals])

  const page = search.page
  const pageSize = search.pageSize
  const pageCount = Math.max(1, Math.ceil(filteredSignals.length / pageSize))
  const currentPage = Math.min(page, pageCount)
  const currentSignals = filteredSignals.slice(
    (currentPage - 1) * pageSize,
    currentPage * pageSize,
  )
  const selectedSignal =
    currentSignals.find((signal) => getSignalKey(signal) === selectedKey) ??
    currentSignals[0]

  useEffect(() => {
    if (page > pageCount) {
      void navigate({
        search: (previous) => ({ ...previous, page: pageCount }),
      })
    }
  }, [navigate, page, pageCount])

  function updateSearch(next: { page?: number; pageSize?: number }) {
    void navigate({ search: (previous) => ({ ...previous, ...next }) })
  }

  function handleQueryChange(value: string) {
    setQuery(value)
    updateSearch({ page: 1 })
  }

  function handleCategoryChange(value: SignalCategoryFilter) {
    setCategory(value)
    updateSearch({ page: 1 })
  }

  function handleToggleExpanded(signal: SelectionSignal) {
    const key = getSignalKey(signal)
    setExpandedKeys((previous) => {
      const next = new Set(previous)
      if (next.has(key)) next.delete(key)
      else next.add(key)
      return next
    })
  }

  return (
    <div className="flex min-h-0 min-w-0 flex-1 flex-col gap-3 overflow-visible md:grid md:grid-cols-[minmax(0,1fr)_260px] md:overflow-hidden lg:grid-cols-[minmax(0,1.55fr)_minmax(280px,0.72fr)]">
      <section className="flex min-h-[420px] min-w-0 flex-1 flex-col overflow-visible rounded-lg border border-border/80 bg-card md:min-h-0 md:overflow-hidden">
        <div className="grid shrink-0 gap-2 border-b border-border/60 p-3 sm:grid-cols-[minmax(0,260px)_auto_1fr] sm:items-center">
          <Input
            aria-label="搜索命中信号"
            className="h-11 bg-background text-sm md:h-8"
            onChange={(event) => handleQueryChange(event.target.value)}
            placeholder="搜索股票名称或代码"
            type="search"
            value={query}
          />
          <select
            aria-label="筛选信号分类"
            className="h-11 rounded-lg border border-input bg-background px-2.5 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 md:h-8"
            onChange={(event) =>
              handleCategoryChange(event.target.value as SignalCategoryFilter)
            }
            value={category}
          >
            {signalCategoryOptions.map((option) => (
              <option key={option.value} value={option.value}>
                {option.label}
              </option>
            ))}
          </select>
          <span className="text-xs tabular-nums text-muted-foreground sm:justify-self-end">
            筛选结果 {filteredSignals.length} 条
          </span>
        </div>

        <div className="flex min-w-0 flex-col md:min-h-0 md:flex-1 md:overflow-hidden">
          <SignalTable
            onSelect={(signal) => setSelectedKey(getSignalKey(signal))}
            selectedKey={selectedSignal ? getSignalKey(selectedSignal) : null}
            signals={currentSignals}
          />
          <SignalRecordList
            expandedKeys={expandedKeys}
            onSelect={(signal) => setSelectedKey(getSignalKey(signal))}
            onToggleExpanded={handleToggleExpanded}
            signals={currentSignals}
          />
        </div>

        <Pagination
          onPageChange={(nextPage) => updateSearch({ page: nextPage })}
          onPageSizeChange={(nextPageSize) =>
            updateSearch({ page: 1, pageSize: nextPageSize })
          }
          page={currentPage}
          pageSize={pageSize}
          pageSizeOptions={PAGE_SIZE_OPTIONS}
          total={filteredSignals.length}
        />
      </section>

      <SignalDetailPanel signal={selectedSignal} />
    </div>
  )
}