import { useEffect, useRef, useState } from 'react'
import {
  type FeedbackDimension, type FeedbackDimensionPrompt,
  loadFeedbackStructure, listFeedbackDimensionPrompts, updateFeedbackDimensionPrompt,
  resetAllDimensionPromptsToDefault,
  getOrSeedDefaultDimensionPromptTemplate, saveDefaultDimensionPromptTemplate,
  getOrSeedDefaultCategoryPromptTemplate, saveDefaultCategoryPromptTemplate,
  getOrSeedCriterionTaggingPromptTemplate, saveCriterionTaggingPromptTemplate,
  getOrSeedChecklistTaggingPromptTemplate, saveChecklistTaggingPromptTemplate,
} from '../db'
import { AI_CONFIG } from '../config/constants'
import { getAiSettings, saveAiSettings } from '../utils/aiClient'

export default function AiPromptConfig() {
  const [dimensions, setDimensions] = useState<FeedbackDimension[]>([])
  const [prompts, setPrompts]       = useState<FeedbackDimensionPrompt[]>([])
  const [defaultTemplate, setDefaultTemplate]     = useState('')
  const [defaultExpanded, setDefaultExpanded]     = useState(false)
  const [defaultSaved, setDefaultSaved]           = useState(false)
  const [categoryTemplate, setCategoryTemplate]   = useState('')
  const [categoryExpanded, setCategoryExpanded]   = useState(false)
  const [categorySaved, setCategorySaved]         = useState(false)
  const [taggingTemplate, setTaggingTemplate]     = useState('')
  const [taggingExpanded, setTaggingExpanded]     = useState(false)
  const [taggingSaved, setTaggingSaved]           = useState(false)
  const [checklistTaggingTemplate, setChecklistTaggingTemplate] = useState('')
  const [checklistTaggingExpanded, setChecklistTaggingExpanded] = useState(false)
  const [checklistTaggingSaved, setChecklistTaggingSaved] = useState(false)
  const [expanded, setExpanded]     = useState<Set<number>>(new Set())
  const [savedDimId, setSavedDimId] = useState<number | null>(null)
  const [bulkResetMsg, setBulkResetMsg] = useState('')
  const saveTimer = useRef<Map<number | 'default' | 'category' | 'tagging' | 'checklistTagging', ReturnType<typeof setTimeout>>>(new Map())
  const [aiKey, setAiKey] = useState(getAiSettings().apiKey)
  const [aiModel, setAiModel] = useState(getAiSettings().model)
  const [aiSaved, setAiSaved] = useState(false)

  const load = async () => {
    const [structure, promptRows, defTemplate, catTemplate, taggingTpl, checklistTaggingTpl] = await Promise.all([
      loadFeedbackStructure(),
      listFeedbackDimensionPrompts(),
      getOrSeedDefaultDimensionPromptTemplate(),
      getOrSeedDefaultCategoryPromptTemplate(),
      getOrSeedCriterionTaggingPromptTemplate(),
      getOrSeedChecklistTaggingPromptTemplate(),
    ])
    setDimensions([...structure.dimensions].sort((a, b) => a.order - b.order))
    setPrompts(promptRows)
    setDefaultTemplate(defTemplate)
    setCategoryTemplate(catTemplate)
    setTaggingTemplate(taggingTpl)
    setChecklistTaggingTemplate(checklistTaggingTpl)
  }

  useEffect(() => { load() }, [])

  const getPrompt = (dimId: number) => prompts.find(p => p.dimensionId === dimId)

  const saveTemplate = (dimId: number, value: string) => {
    setPrompts(prev => prev.map(p => p.dimensionId === dimId ? { ...p, promptTemplate: value } : p))
    const prevTimer = saveTimer.current.get(dimId)
    if (prevTimer) clearTimeout(prevTimer)
    saveTimer.current.set(dimId, setTimeout(async () => {
      const existing = getPrompt(dimId)
      if (!existing?.id) return
      await updateFeedbackDimensionPrompt(existing.id, { promptTemplate: value })
      setSavedDimId(dimId)
      setTimeout(() => setSavedDimId(null), 2000)
    }, 600))
  }

  const resetToDefault = async (dimId: number) => {
    const existing = getPrompt(dimId)
    if (!existing?.id) return
    await updateFeedbackDimensionPrompt(existing.id, { promptTemplate: defaultTemplate })
    setPrompts(prev => prev.map(p => p.dimensionId === dimId ? { ...p, promptTemplate: defaultTemplate } : p))
  }

  const resetAllToDefault = async () => {
    if (!confirm('Alle Dimension-Prompts wirklich auf den Standard (1–10) setzen? Individuelle Anpassungen gehen verloren.')) return
    const { updated } = await resetAllDimensionPromptsToDefault()
    const promptRows = await listFeedbackDimensionPrompts()
    setPrompts(promptRows)
    setBulkResetMsg(`${updated} Dimension-Prompt(s) auf Standard gesetzt.`)
    setTimeout(() => setBulkResetMsg(''), 4000)
  }

  const saveDefaultTemplate = (value: string) => {
    setDefaultTemplate(value)
    const prevTimer = saveTimer.current.get('default')
    if (prevTimer) clearTimeout(prevTimer)
    saveTimer.current.set('default', setTimeout(async () => {
      await saveDefaultDimensionPromptTemplate(value)
      setDefaultSaved(true)
      setTimeout(() => setDefaultSaved(false), 2000)
    }, 600))
  }

  const saveCategoryTemplate = (value: string) => {
    setCategoryTemplate(value)
    const prevTimer = saveTimer.current.get('category')
    if (prevTimer) clearTimeout(prevTimer)
    saveTimer.current.set('category', setTimeout(async () => {
      await saveDefaultCategoryPromptTemplate(value)
      setCategorySaved(true)
      setTimeout(() => setCategorySaved(false), 2000)
    }, 600))
  }

  const resetTaggingToDefault = async () => {
    const def = AI_CONFIG.defaultCriterionTaggingPromptTemplate
    await saveCriterionTaggingPromptTemplate(def)
    setTaggingTemplate(def)
  }

  const resetChecklistTaggingToDefault = async () => {
    const def = AI_CONFIG.defaultChecklistTaggingPromptTemplate
    await saveChecklistTaggingPromptTemplate(def)
    setChecklistTaggingTemplate(def)
  }

  const saveTaggingTemplate = (value: string) => {
    setTaggingTemplate(value)
    const prevTimer = saveTimer.current.get('tagging')
    if (prevTimer) clearTimeout(prevTimer)
    saveTimer.current.set('tagging', setTimeout(async () => {
      await saveCriterionTaggingPromptTemplate(value)
      setTaggingSaved(true)
      setTimeout(() => setTaggingSaved(false), 2000)
    }, 600))
  }

  const saveChecklistTaggingTemplate = (value: string) => {
    setChecklistTaggingTemplate(value)
    const prevTimer = saveTimer.current.get('checklistTagging')
    if (prevTimer) clearTimeout(prevTimer)
    saveTimer.current.set('checklistTagging', setTimeout(async () => {
      await saveChecklistTaggingPromptTemplate(value)
      setChecklistTaggingSaved(true)
      setTimeout(() => setChecklistTaggingSaved(false), 2000)
    }, 600))
  }

  return (
    <div className="space-y-4">
      <div>
        <h2 className="text-lg font-bold text-gray-800">KI-Feedback (Kaskade)</h2>
        <p className="text-sm text-gray-500 mt-1">
          Stufe A: ein Call pro Kategorie (globaler Kategorie-Prompt). Stufe B: ein Call pro Dimension
          (Verdichtung aus Kategorie-Ergebnissen — pro Dimension editierbar unten).
        </p>
      </div>

      <div className="bg-white rounded-xl border border-blue-100 shadow-sm p-4 space-y-3">
        <div className="text-sm font-semibold text-blue-800">OpenRouter API-Key</div>
        <p className="text-xs text-gray-500">
          Wird lokal im Browser gespeichert (<span className="font-mono">localStorage</span>) — nötig für
          KI-Feedback und „Vorschläge analysieren". Key von{' '}
          <span className="font-mono">openrouter.ai</span>.
        </p>
        <input
          type="password"
          className="w-full border border-blue-200 rounded-lg px-3 py-2 text-sm focus:outline-none focus:border-brand"
          placeholder="sk-or-..."
          value={aiKey}
          onChange={e => setAiKey(e.target.value)}
        />
        <select
          className="w-full border border-blue-200 rounded-lg px-3 py-2 text-sm bg-white"
          value={aiModel}
          onChange={e => setAiModel(e.target.value)}>
          <option value="openai/gpt-4o-mini">GPT-4o mini (günstig)</option>
          <option value="openai/gpt-4o">GPT-4o</option>
          <option value="anthropic/claude-sonnet-4-5">Claude Sonnet 4.5</option>
          <option value="anthropic/claude-haiku-4-5">Claude Haiku 4.5 (schnell)</option>
          <option value="google/gemini-flash-1.5">Gemini Flash 1.5</option>
        </select>
        <button
          onClick={() => {
            saveAiSettings(aiKey, aiModel)
            setAiSaved(true)
            setTimeout(() => setAiSaved(false), 2000)
          }}
          className="w-full py-2.5 bg-brand text-white rounded-xl text-sm font-semibold">
          API-Key speichern
        </button>
        {aiSaved && (
          <div className="text-xs text-green-700 bg-green-50 border border-green-200 rounded-lg px-3 py-2 text-center">
            Gespeichert.
          </div>
        )}
      </div>

      {/* Kategorie-Prompt Stufe A */}
      <div className="bg-white rounded-xl border border-green-100 shadow-sm overflow-hidden">
        <button
          onClick={() => setCategoryExpanded(p => !p)}
          className="w-full flex items-center justify-between p-3 bg-green-50 border-b border-green-100 text-left">
          <span className="font-semibold text-sm text-green-800">Stufe A — Kategorie-Prompt (1 Call pro Kategorie)</span>
          <span className="text-xs text-green-400">{categoryExpanded ? '▲' : '▼'}</span>
        </button>
        {categoryExpanded && (
          <div className="p-3 space-y-2">
            <p className="text-xs text-gray-500">
              Wird für jede Kategorie einzeln aufgerufen. Der Trend-Vorschlag aus Meetings wird im Prompt
              vorgegeben; die KI bestätigt oder passt maximal ±1 an.
            </p>
            <textarea
              className="w-full border border-gray-200 rounded-lg px-3 py-2 text-xs font-mono focus:outline-none focus:border-brand min-h-[280px]"
              value={categoryTemplate}
              onChange={e => saveCategoryTemplate(e.target.value)}
            />
            {categorySaved && <span className="text-xs text-green-600 font-medium">Gespeichert.</span>}
            <div className="grid gap-1.5 pt-2">
              {AI_CONFIG.categoryPromptPlaceholders.map(p => (
                <div key={p.token} className="text-xs text-gray-600 flex gap-2">
                  <code className="bg-white border border-gray-200 rounded px-1.5 py-0.5 text-brand font-mono flex-shrink-0">{p.token}</code>
                  <span>{p.description}</span>
                </div>
              ))}
            </div>
          </div>
        )}
      </div>

      {/* Standard-Prompt Stufe B */}
      <div className="bg-white rounded-xl border border-blue-100 shadow-sm overflow-hidden">
        <button
          onClick={() => setDefaultExpanded(p => !p)}
          className="w-full flex items-center justify-between p-3 bg-blue-50 border-b border-blue-100 text-left">
          <span className="font-semibold text-sm text-blue-800">Stufe B — Dimensions-Verdichtung (Basis für neue Dimensionen &amp; „Zurücksetzen")</span>
          <span className="text-xs text-blue-400">{defaultExpanded ? '▲' : '▼'}</span>
        </button>
        {defaultExpanded && (
          <div className="p-3 space-y-2">
            <p className="text-xs text-gray-500">
              Input sind nur die Kategorie-Ergebnisse aus Stufe A — kein Rohprotokoll. Wird beim Anlegen
              neuer Dimensionen automatisch übernommen und ist die Basis für „Auf Standard zurücksetzen".
            </p>
            <textarea
              className="w-full border border-gray-200 rounded-lg px-3 py-2 text-xs font-mono focus:outline-none focus:border-brand min-h-[320px]"
              value={defaultTemplate}
              onChange={e => saveDefaultTemplate(e.target.value)}
            />
            {defaultSaved && <span className="text-xs text-green-600 font-medium">Gespeichert.</span>}
          </div>
        )}
      </div>

      <div className="flex items-center gap-3 flex-wrap">
        <button
          onClick={resetAllToDefault}
          className="text-xs bg-amber-50 hover:bg-amber-100 text-amber-800 border border-amber-200 px-3 py-1.5 rounded-lg font-medium">
          Alle Dimension-Prompts auf Standard (Stufe B) setzen
        </button>
        {bulkResetMsg && <span className="text-xs text-green-600 font-medium">{bulkResetMsg}</span>}
      </div>

      {/* Platzhalter-Legende */}
      <div className="bg-gray-50 rounded-xl border border-gray-100 p-4 space-y-2">
        <div className="text-xs font-semibold text-gray-500 uppercase tracking-wide">Verfügbare Platzhalter</div>
        <div className="grid gap-1.5">
          {AI_CONFIG.dimensionPromptPlaceholders.map(p => (
            <div key={p.token} className="text-xs text-gray-600 flex gap-2">
              <code className="bg-white border border-gray-200 rounded px-1.5 py-0.5 text-brand font-mono flex-shrink-0">{p.token}</code>
              <span>{p.description}</span>
            </div>
          ))}
        </div>
      </div>

      <div>
        <h2 className="text-lg font-bold text-gray-800">KI-Prompts: Kriterien-Zuordnungsvorschläge</h2>
        <p className="text-sm text-gray-500 mt-1">
          „🏷 Vorschläge analysieren" im Meeting löst <strong>zwei getrennte KI-Calls</strong> aus: Protokoll-Freitext
          (Antwortformat <code className="font-mono text-xs">ZEILE n:</code>) und Checklistenpunkte
          (<code className="font-mono text-xs">PUNKT n:</code>).
        </p>
      </div>

      <div className="bg-white rounded-xl border border-indigo-100 shadow-sm overflow-hidden">
        <button
          onClick={() => setTaggingExpanded(p => !p)}
          className="w-full flex items-center justify-between p-3 bg-indigo-50 border-b border-indigo-100 text-left">
          <span className="font-semibold text-sm text-indigo-800">Protokoll — Tagging-Prompt</span>
          <span className="text-xs text-indigo-400">{taggingExpanded ? '▲' : '▼'}</span>
        </button>
        {taggingExpanded && (
          <div className="p-3 space-y-2">
            <p className="text-xs text-gray-500">Freitext-Zeilen aus Gesprächsprotokoll und allgemeinen Notizen.</p>
            <textarea
              className="w-full border border-gray-200 rounded-lg px-3 py-2 text-xs font-mono focus:outline-none focus:border-brand min-h-[280px]"
              value={taggingTemplate}
              onChange={e => saveTaggingTemplate(e.target.value)}
            />
            {taggingSaved && <span className="text-xs text-green-600 font-medium">Gespeichert.</span>}
            <button onClick={resetTaggingToDefault}
              className="text-xs bg-gray-100 hover:bg-gray-200 text-gray-600 px-3 py-1.5 rounded-lg font-medium">
              Protokoll-Tagging auf Standard zurücksetzen
            </button>
          </div>
        )}
      </div>

      <div className="bg-gray-50 rounded-xl border border-gray-100 p-4 space-y-2">
        <div className="text-xs font-semibold text-gray-500 uppercase tracking-wide">Platzhalter Protokoll-Tagging</div>
        <div className="grid gap-1.5">
          {AI_CONFIG.criterionTaggingPromptPlaceholders.map(p => (
            <div key={p.token} className="text-xs text-gray-600 flex gap-2">
              <code className="bg-white border border-gray-200 rounded px-1.5 py-0.5 text-brand font-mono flex-shrink-0">{p.token}</code>
              <span>{p.description}</span>
            </div>
          ))}
        </div>
      </div>

      <div className="bg-white rounded-xl border border-teal-100 shadow-sm overflow-hidden">
        <button
          onClick={() => setChecklistTaggingExpanded(p => !p)}
          className="w-full flex items-center justify-between p-3 bg-teal-50 border-b border-teal-100 text-left">
          <span className="font-semibold text-sm text-teal-800">Checkliste — Tagging-Prompt</span>
          <span className="text-xs text-teal-400">{checklistTaggingExpanded ? '▲' : '▼'}</span>
        </button>
        {checklistTaggingExpanded && (
          <div className="p-3 space-y-2">
            <p className="text-xs text-gray-500">
              Strukturierte Prüfpunkte — nur Label (kein Score). Antwortformat: <code className="font-mono">PUNKT n:</code>.
              In Config → Ass.-Typen als „Standard-Zuordnung (KI)" nutzbar; spart Meeting-Calls.
            </p>
            <textarea
              className="w-full border border-gray-200 rounded-lg px-3 py-2 text-xs font-mono focus:outline-none focus:border-brand min-h-[280px]"
              value={checklistTaggingTemplate}
              onChange={e => saveChecklistTaggingTemplate(e.target.value)}
            />
            {checklistTaggingSaved && <span className="text-xs text-green-600 font-medium">Gespeichert.</span>}
            <button onClick={resetChecklistTaggingToDefault}
              className="text-xs bg-gray-100 hover:bg-gray-200 text-gray-600 px-3 py-1.5 rounded-lg font-medium">
              Checklisten-Tagging auf Standard zurücksetzen
            </button>
          </div>
        )}
      </div>

      <div className="bg-gray-50 rounded-xl border border-gray-100 p-4 space-y-2">
        <div className="text-xs font-semibold text-gray-500 uppercase tracking-wide">Platzhalter Checklisten-Tagging</div>
        <div className="grid gap-1.5">
          {AI_CONFIG.checklistTaggingPromptPlaceholders.map(p => (
            <div key={p.token} className="text-xs text-gray-600 flex gap-2">
              <code className="bg-white border border-gray-200 rounded px-1.5 py-0.5 text-brand font-mono flex-shrink-0">{p.token}</code>
              <span>{p.description}</span>
            </div>
          ))}
        </div>
      </div>

      {/* Dimensionen */}
      {dimensions.map(dim => {
        const isOpen = expanded.has(dim.id!)
        const prompt = getPrompt(dim.id!)
        return (
          <div key={dim.id} className="bg-white rounded-xl border border-gray-100 shadow-sm overflow-hidden">
            <button
              onClick={() => setExpanded(prev => {
                const next = new Set(prev)
                if (next.has(dim.id!)) next.delete(dim.id!); else next.add(dim.id!)
                return next
              })}
              className="w-full flex items-center justify-between p-3 bg-gray-50 border-b border-gray-100 text-left">
              <span className="font-semibold text-sm text-gray-800">{dim.name}</span>
              <span className="text-xs text-gray-400">{isOpen ? '▲' : '▼'}</span>
            </button>

            {isOpen && (
              <div className="p-3 space-y-2">
                <textarea
                  className="w-full border border-gray-200 rounded-lg px-3 py-2 text-xs font-mono focus:outline-none focus:border-brand min-h-[320px]"
                  value={prompt?.promptTemplate ?? ''}
                  onChange={e => saveTemplate(dim.id!, e.target.value)}
                />
                <div className="flex items-center gap-2">
                  <button onClick={() => resetToDefault(dim.id!)}
                    className="text-xs bg-gray-100 hover:bg-gray-200 text-gray-600 px-3 py-1.5 rounded-lg font-medium">
                    Auf Standard zurücksetzen
                  </button>
                  {savedDimId === dim.id && (
                    <span className="text-xs text-green-600 font-medium">Gespeichert.</span>
                  )}
                </div>
              </div>
            )}
          </div>
        )
      })}
      {dimensions.length === 0 && (
        <div className="text-sm text-gray-400 text-center py-6">
          Noch keine Dimensionen angelegt — siehe Tab „Feedback".
        </div>
      )}
    </div>
  )
}