import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import { useNavigate } from 'react-router-dom'
import { listInitiatives } from '../api/initiatives.js'
import { listWorkspaceOpenActions } from '../api/workspace.js'
import { useProgramScope } from '../context/ProgramScopeContext.jsx'
import { loadRecentObjects } from '../utils/recentObjects.js'
import {
  actionPath,
  gatePath,
  initiativeCatalogPath,
  projectPath,
  scopedPath,
} from '../utils/routes.js'

const TYPE_LABELS = {
  action: 'Arbeitspaket',
  project: 'Projekt',
  gate: 'Gate',
  initiative: 'Vorhaben',
}

function matchQuery(text, query) {
  return (text || '').toLowerCase().includes(query.toLowerCase())
}

export function QuickJump() {
  const navigate = useNavigate()
  const { applyFromInitiative } = useProgramScope()
  const [open, setOpen] = useState(false)
  const [query, setQuery] = useState('')
  const [initiatives, setInitiatives] = useState([])
  const [actions, setActions] = useState([])
  const [recent, setRecent] = useState([])
  const rootRef = useRef(null)

  useEffect(() => {
    let cancelled = false
    Promise.all([
      listInitiatives().catch(() => []),
      listWorkspaceOpenActions().catch(() => []),
    ]).then(([initData, actionData]) => {
      if (cancelled) return
      setInitiatives(initData)
      setActions(actionData)
    })
    return () => {
      cancelled = true
    }
  }, [])

  useEffect(() => {
    setRecent(loadRecentObjects())
  }, [open])

  useEffect(() => {
    function onDocClick(e) {
      if (rootRef.current && !rootRef.current.contains(e.target)) {
        setOpen(false)
      }
    }
    document.addEventListener('mousedown', onDocClick)
    return () => document.removeEventListener('mousedown', onDocClick)
  }, [])

  const results = useMemo(() => {
    const q = query.trim()
    if (!q) return []

    const hits = []

    for (const item of initiatives) {
      if (matchQuery(item.title, q)) {
        hits.push({
          key: `initiative-${item.id}`,
          label: item.title,
          meta: 'Vorhaben',
          href: scopedPath('/control/status', { initiativeId: item.id }),
          onSelect: () => applyFromInitiative(item.id),
        })
      }
    }

    for (const action of actions) {
      if (matchQuery(action.title, q)) {
        hits.push({
          key: `action-${action.id}`,
          label: action.title,
          meta: 'Arbeitspaket',
          href: actionPath(action.id),
        })
      }
    }

    return hits.slice(0, 8)
  }, [query, initiatives, actions, applyFromInitiative])

  const go = useCallback(
    (href, onSelect) => {
      if (onSelect) onSelect()
      navigate(href)
      setOpen(false)
      setQuery('')
    },
    [navigate],
  )

  return (
    <div className="quick-jump" ref={rootRef}>
      <button
        type="button"
        className="quick-jump__trigger"
        onClick={() => setOpen((v) => !v)}
        aria-expanded={open}
        aria-haspopup="listbox"
      >
        Springen zu…
      </button>
      {open && (
        <div className="quick-jump__panel">
          <input
            type="search"
            className="quick-jump__input"
            placeholder="Vorhaben, Arbeitspaket …"
            value={query}
            onChange={(e) => setQuery(e.target.value)}
            autoFocus
          />
          <ul className="quick-jump__list" role="listbox">
            {query.trim() === '' &&
              recent.map((item) => (
                <li key={`recent-${item.type}-${item.id}`}>
                  <button
                    type="button"
                    className="quick-jump__item"
                    onClick={() => go(item.href)}
                  >
                    <span className="quick-jump__item-label">{item.title}</span>
                    <span className="quick-jump__item-meta">
                      {TYPE_LABELS[item.type] || item.type} · zuletzt
                    </span>
                  </button>
                </li>
              ))}
            {query.trim() !== '' &&
              results.map((item) => (
                <li key={item.key}>
                  <button
                    type="button"
                    className="quick-jump__item"
                    onClick={() => go(item.href, item.onSelect)}
                  >
                    <span className="quick-jump__item-label">{item.label}</span>
                    <span className="quick-jump__item-meta">{item.meta}</span>
                  </button>
                </li>
              ))}
            {query.trim() !== '' && results.length === 0 && (
              <li className="quick-jump__empty">Keine Treffer</li>
            )}
            {query.trim() === '' && recent.length === 0 && (
              <li className="quick-jump__empty">Tippe zum Suchen — oder öffne ein Objekt.</li>
            )}
          </ul>
          <div className="quick-jump__footer">
            <button
              type="button"
              className="link-inline"
              onClick={() => go(initiativeCatalogPath())}
            >
              Vorhaben-Katalog
            </button>
          </div>
        </div>
      )}
    </div>
  )
}

export { actionPath, projectPath, gatePath }