import { NavLink, useLocation } from 'react-router-dom'
import { useEffect, useState } from 'react'
import { listInitiativeActions } from '../api/initiatives.js'
import { listInitiativeBacklog } from '../api/backlog.js'
import { useProgramScope } from '../context/ProgramScopeContext.jsx'
import {
  PLAN_OUTLINE_NODES,
  resolvePlanOutlineActiveKey,
} from '../plan/planOutlineNodes.js'

export function PlanOutlineNav() {
  const location = useLocation()
  const { initiativeId, initiativeTitle, hrefWithScope } = useProgramScope()
  const activeKey = resolvePlanOutlineActiveKey(location.pathname)
  const [counts, setCounts] = useState({ inbox: null, work: null })

  useEffect(() => {
    if (!initiativeId) {
      setCounts({ inbox: null, work: null })
      return undefined
    }
    let cancelled = false
    Promise.all([
      listInitiativeBacklog(initiativeId).catch(() => []),
      listInitiativeActions(initiativeId).catch(() => []),
    ]).then(([backlog, actions]) => {
      if (cancelled) return
      setCounts({
        inbox: backlog.filter((item) => item.status !== 'converted').length,
        work: actions.filter(
          (action) => action.status !== 'done' && action.status !== 'discarded',
        ).length,
      })
    })
    return () => {
      cancelled = true
    }
  }, [initiativeId, location.pathname])

  function nodeLabel(node) {
    if (node.key === 'inbox' && counts.inbox != null) {
      return `${node.label} (${counts.inbox})`
    }
    if (node.key === 'work' && counts.work != null) {
      return `${node.label} (${counts.work})`
    }
    return node.label
  }

  return (
    <nav className="analysis-split__nav" aria-label="Plan-Navigation">
      <div className="analysis-split__nav-header">
        <span className="analysis-split__nav-eyebrow">Planen</span>
        {initiativeId ? (
          <p className="analysis-split__nav-scope" title={initiativeTitle || initiativeId}>
            {initiativeTitle || 'Vorhaben'}
          </p>
        ) : (
          <p className="analysis-split__nav-scope analysis-split__nav-scope--muted">
            Portfolio — Vorhaben wählen
          </p>
        )}
      </div>

      <ul className="analysis-split__nav-list">
        {PLAN_OUTLINE_NODES.map((node) => {
          const needsInitiative = node.requiresInitiative && !initiativeId
          const isDisabled = node.disabled || needsInitiative

          if (isDisabled) {
            return (
              <li key={node.key}>
                <span
                  className={
                    'analysis-split__nav-link analysis-split__nav-link--disabled' +
                    (activeKey === node.key ? ' analysis-split__nav-link--active' : '')
                  }
                  aria-disabled="true"
                  title={needsInitiative ? 'Vorhaben im Scope wählen' : node.hint}
                >
                  {nodeLabel(node)}
                </span>
              </li>
            )
          }

          return (
            <li key={node.key}>
              <NavLink
                to={hrefWithScope(node.to)}
                end
                className={({ isActive }) =>
                  'analysis-split__nav-link' +
                  (isActive ? ' analysis-split__nav-link--active' : '')
                }
              >
                {nodeLabel(node)}
              </NavLink>
            </li>
          )
        })}
      </ul>
    </nav>
  )
}