import { prisma } from '@/lib/prisma'
import { getAIProvider } from '@/lib/ai/factory'
import type { Notebook } from '@/lib/types'

export class NotebookSuggestionService {
  /**
   * Suggest the most appropriate notebook for a note
   * @param noteContent - Content of the note
   * @param userId - User ID (for fetching user's notebooks)
   * @returns Suggested notebook or null (if no good match)
   */
  async suggestNotebook(noteContent: string, userId: string): Promise<Notebook | null> {
    // 1. Get all notebooks for this user
    const notebooks = await prisma.notebook.findMany({
      where: { userId },
      include: {
        labels: true,
        _count: {
          select: { notes: true },
        },
      },
      orderBy: { order: 'asc' },
    })

    if (notebooks.length === 0) {
      return null // No notebooks to suggest
    }

    // 2. Build prompt for AI (always in French - interface language)
    const prompt = this.buildPrompt(noteContent, notebooks)

    // 3. Call AI
    try {
      const provider = getAIProvider()

      const response = await provider.generateText(prompt)

      const suggestedName = response.trim().toUpperCase()

      // 5. Find matching notebook
      const suggestedNotebook = notebooks.find(nb =>
        nb.name.toUpperCase() === suggestedName
      )

      // If AI says "NONE" or no match, return null
      if (suggestedName === 'NONE' || !suggestedNotebook) {
        return null
      }

      return suggestedNotebook as Notebook
    } catch (error) {
      console.error('Failed to suggest notebook:', error)
      return null
    }
  }

  /**
   * Build the AI prompt for notebook suggestion (always in French - interface language)
   */
  private buildPrompt(noteContent: string, notebooks: any[]): string {
    const notebookList = notebooks
      .map(nb => {
        const labels = nb.labels.map((l: any) => l.name).join(', ')
        const count = nb._count?.notes || 0
        return `- ${nb.name} (${count} notes)${labels ? ` [labels: ${labels}]` : ''}`
      })
      .join('\n')

    return `
Tu es un assistant qui suggère à quel carnet une note devrait appartenir.

CONTENU DE LA NOTE :
${noteContent.substring(0, 500)}

CARNETS DISPONIBLES :
${notebookList}

TÂCHE :
Analyse le contenu de la note (peu importe la langue) et suggère le carnet le PLUS approprié pour cette note.
Considère :
1. Le sujet/thème de la note (LE PLUS IMPORTANT)
2. Les labels existants dans chaque carnet
3. Le nombre de notes (préfère les carnets avec du contenu connexe)

GUIDES DE CLASSIFICATION :
- SPORT/EXERCICE/ACHATS/COURSSES → Carnet Personnel
- LOISIRS/PASSIONS/SORTIES → Carnet Personnel
- SANTÉ/FITNESS/MÉDECIN → Carnet Personnel ou Santé
- FAMILLE/AMIS → Carnet Personnel
- TRAVAIL/RÉUNIONS/PROJETS/CLIENTS → Carnet Travail
- CODING/TECH/DÉVELOPPEMENT → Carnet Travail ou Code
- FINANCES/FACTURES/BANQUE → Carnet Personnel ou Finances

RÈGLES :
- Retourne SEULEMENT le nom du carnet, EXACTEMENT comme indiqué ci-dessus (insensible à la casse)
- Si aucune bonne correspondance n'existe, retourne "NONE"
- Si la note est trop générique/vague, retourne "NONE"
- N'inclus pas d'explications ou de texte supplémentaire

Exemples :
- "Réunion avec Jean sur le planning du projet" → carnet "Travail"
- "Liste de courses ou achat de vêtements" → carnet "Personnel"
- "Script Python pour analyse de données" → carnet "Code"
- "Séance de sport ou fitness" → carnet "Personnel"
- "Achat d'une chemise et d'un jean" → carnet "Personnel"

Ta suggestion :
`.trim()
  }

  /**
   * Batch suggest notebooks for multiple notes (IA3)
   * @param noteContents - Array of note contents
   * @param userId - User ID
   * @returns Map of note index -> suggested notebook
   */
  async suggestNotebooksBatch(
    noteContents: string[],
    userId: string
  ): Promise<Map<number, Notebook | null>> {
    const results = new Map<number, Notebook | null>()

    // For efficiency, we could batch this into a single AI call
    // For now, process sequentially (could be parallelized)
    for (let i = 0; i < noteContents.length; i++) {
      const suggestion = await this.suggestNotebook(noteContents[i], userId)
      results.set(i, suggestion)
    }

    return results
  }

  /**
   * Get notebook suggestion confidence score
   * (For future UI enhancement: show confidence level)
   */
  async suggestNotebookWithConfidence(
    noteContent: string,
    userId: string
  ): Promise<{ notebook: Notebook | null; confidence: number }> {
    // This could use logprobs from OpenAI API to calculate confidence
    // For now, return binary confidence
    const notebook = await this.suggestNotebook(noteContent, userId)
    return {
      notebook,
      confidence: notebook ? 0.8 : 0, // Fixed confidence for now
    }
  }
}

// Export singleton instance
export const notebookSuggestionService = new NotebookSuggestionService()