import { NextResponse } from 'next/server'
import { getDb } from '@/lib/db'

export const runtime = 'nodejs'

// Simple bad word check
function hasBadWords(text: string): { flag: boolean; reason?: string } {
  const lower = text.toLowerCase()
  const badWords = [
    { word: 'hurensohn', reason: 'Beleidigung' },
    { word: 'arschloch', reason: 'Beleidigung' },
    { word: 'wichser', reason: 'Beleidigung' },
    { word: 'fotze', reason: 'Beleidigung' },
    { word: 'spam', reason: 'Spam-Verdacht' },
    { word: 'werbung', reason: 'Werbung' },
    { word: 'casino', reason: 'Werbung' },
    { word: 'viagra', reason: 'Werbung' }
  ]
  
  for (const { word, reason } of badWords) {
    if (lower.includes(word)) {
      return { flag: true, reason }
    }
  }
  
  return { flag: false }
}

// Background AI moderation with Ollama
async function moderateWithAI(contributionId: number, content: string) {
  console.log(`[AI-Mod] Starting for ${contributionId}`)
  
  // Step 1: Instant bad word check
  const lowerCheck = content.toLowerCase()
  const badWords = ['hurensohn', 'arschloch', 'wichser', 'fotze']
  const foundBadWord = badWords.find(word => lowerCheck.includes(word))
  
  if (foundBadWord) {
    console.log(`[AI-Mod] ⚠️ INSTANT FLAG: "${foundBadWord}" detected!`)
    const db = getDb()
    db.prepare(`
      UPDATE contributions 
      SET status = 'flagged', moderation_reason = ?
      WHERE id = ?
    `).run(`Unangemessene Sprache: "${foundBadWord}"`, contributionId)
    console.log(`[AI-Mod] ✅ FLAGGED ${contributionId} instantly`)
    return
  }
  
  // Step 2: AI check for subtle issues (irrelevant content, hidden insults etc.)
  console.log(`[AI-Mod] No bad words, asking AI...`)
  
  try {
    const prompt = `Du prüfst Beiträge für eine Gedenkseite einer verstorbenen Großmutter (Maria Malejka).

Text: "${content}"

WICHTIG: Sei SEHR großzügig! Die meisten Beiträge sind von Familienmitgliedern und Freunden.

ERLAUBT (immer appropriate=true):
- Kurze Beschreibungen wie "Hochzeit", "Geburtstag", "Urlaub in..." - das sind Erinnerungen!
- Namen, Orte, Daten - das sind Zeitstrahl-Einträge
- Alles was eine Erinnerung, ein Ereignis oder ein Lebensmoment sein könnte
- Persönliche Geschichten, Beileidsbekundungen, Liebe, Vermissen, Trauer
- Auch sehr kurze Texte oder einzelne Wörter sind OK wenn sie ein Ereignis beschreiben

NUR VERBOTEN (appropriate=false):
- Beleidigungen, Hassrede, Schimpfwörter
- Offensichtlicher Spam oder Werbung mit Links
- Komplett sinnloser Text (zufällige Buchstaben, Tastatur-Spam)

Im Zweifel: appropriate=true

Antworte NUR mit JSON:
{"appropriate": true} oder {"appropriate": false, "reason": "kurze Begründung"}
JSON:`

    const controller = new AbortController()
    const timeout = setTimeout(() => controller.abort(), 15000)
    
    const ollamaUrl = process.env.OLLAMA_URL || 'http://localhost:11434'
    const res = await fetch(`${ollamaUrl}/api/generate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      signal: controller.signal,
      body: JSON.stringify({
        model: 'llama3.2:latest',
        prompt,
        stream: false,
        options: {
          temperature: 0.1,
          num_predict: 60,
          num_ctx: 512
        }
      })
    })
    
    if (!res.ok) {
      clearTimeout(timeout)
      console.warn(`[AI-Mod] Ollama error: ${res.status}`)
      return
    }
    
    const data = await res.json()
    clearTimeout(timeout)
    const responseText = (data.response || '').trim()
    console.log(`[AI-Mod] Response: "${responseText}"`)
    
    // Parse JSON
    let result: any = null
    try {
      const jsonMatch = responseText.match(/\{[^}]+\}/)
      if (jsonMatch) {
        result = JSON.parse(jsonMatch[0])
      }
    } catch (e) {
      console.error(`[AI-Mod] Parse error:`, e)
    }
    
    // Flag if inappropriate
    if (result && result.appropriate === false) {
      const db = getDb()
      db.prepare(`
        UPDATE contributions 
        SET status = 'flagged', moderation_reason = ?
        WHERE id = ?
      `).run(result.reason || 'KI-Warnung', contributionId)
      console.log(`[AI-Mod] ⚠️ FLAGGED ${contributionId}: ${result.reason}`)
    } else {
      console.log(`[AI-Mod] ✅ Passed ${contributionId}`)
    }
    
  } catch (error: any) {
    if (error.name === 'AbortError') {
      console.warn(`[AI-Mod] Timeout for ${contributionId}`)
    } else {
      console.error(`[AI-Mod] Error for ${contributionId}:`, error.message)
    }
  }
}

export async function POST(request: Request) {
  try {
    const body = await request.json()
    const { name, type, title, content, year, month, day, location, media_filenames } = body

    if (!type) {
      return NextResponse.json(
        { error: 'Type is required' },
        { status: 400 }
      )
    }

    // Require content for memory type, title for timeline
    if (type === 'memory' && !content) {
      return NextResponse.json(
        { error: 'Content is required for memories' },
        { status: 400 }
      )
    }
    if (type === 'timeline' && !title) {
      return NextResponse.json(
        { error: 'Title is required for timeline entries' },
        { status: 400 }
      )
    }

    const db = getDb()
    
    // 1. Check bad words instantly - clean content is auto-approved
    const textToCheck = [content, title].filter(Boolean).join(' ')
    const badWordCheck = textToCheck ? hasBadWords(textToCheck) : { flag: false }
    const initialStatus = badWordCheck.flag ? 'flagged' : 'approved'
    const moderationReason = badWordCheck.flag ? (badWordCheck as any).reason : null
    
    // 2. Insert contribution with all fields
    const result = db.prepare(`
      INSERT INTO contributions (name, type, title, content, year, month, day, location, media_filenames, status, moderation_reason)
      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `).run(
      name || 'Anonym',
      type,
      title || null,
      content || null,
      year || null,
      month || null,
      day || null,
      location || null,
      media_filenames || null,
      initialStatus,
      moderationReason || null
    )

    const contributionId = Number(result.lastInsertRowid)
    console.log(`[API] Created contribution ${contributionId}, type: ${type}, status: ${initialStatus}`)

    // 3. If not already flagged and has text, run AI check in background
    if (!badWordCheck.flag && textToCheck) {
      moderateWithAI(contributionId, textToCheck).catch(e => 
        console.error('[AI-Mod] Background error:', e)
      )
    }

    return NextResponse.json({
      success: true,
      id: contributionId,
      message: 'Beitrag wurde gespeichert'
    })

  } catch (error) {
    console.error('[API] Error:', error)
    return NextResponse.json(
      { error: 'Failed to create contribution' },
      { status: 500 }
    )
  }
}

export async function GET(request: Request) {
  try {
    const { searchParams } = new URL(request.url)
    const status = searchParams.get('status')
    const db = getDb()
    
    let query: string
    let params: string[] = []
    
    if (status) {
      query = 'SELECT * FROM contributions WHERE status = ? ORDER BY created_at DESC'
      params = [status]
    } else {
      // Return ALL contributions (admin needs all, public will filter client-side)
      query = 'SELECT * FROM contributions ORDER BY created_at DESC'
    }
    
    const contributions = db.prepare(query).all(...params)
    return NextResponse.json(contributions)
  } catch (error) {
    console.error('[API] Error fetching:', error)
    return NextResponse.json(
      { error: 'Failed to fetch contributions' },
      { status: 500 }
    )
  }
}