import OpenAI from 'openai'
import type { QuestPlan, GeneratedPoint, PointContent } from '../types.js'
import { getSystemPrompt } from '../prompts/system.js'
import { getStepGenerationPrompt } from '../prompts/step-generation.js'
import { getPointContentPrompt } from '../prompts/point-content.js'
import { getReactionPrompt } from '../prompts/reaction.js'

const client = new OpenAI({
  baseURL: process.env.LLM_BASE_URL || 'https://api.deepseek.com',
  apiKey: process.env.LLM_API_KEY || '',
})

const MODEL = process.env.LLM_MODEL || 'deepseek-chat'

class AIService {
  async generateQuestPlan(params: {
    city: string
    days: number
    companions: string
    pace: string
    userComment?: string
    lang: string
  }): Promise<QuestPlan> {
    const systemPrompt = getSystemPrompt(params.lang)

    const userPrompt = `Create a quest plan for a traveler:
- City: ${params.city}
- Duration: ${params.days} day(s)
- Companions: ${params.companions}
- Pace: ${params.pace}
${params.userComment ? `- Special wishes: ${params.userComment}` : ''}

Return a JSON object with:
{
  "title": "Creative quest title (in ${params.lang === 'ru' ? 'Russian' : 'English'})",
  "description": "1-2 sentence quest description that sets the mood (in ${params.lang === 'ru' ? 'Russian' : 'English'})",
  "dayThemes": ["Theme for day 1", "Theme for day 2", ...]
}

IMPORTANT: Return ONLY valid JSON, no markdown, no extra text.`

    const response = await client.chat.completions.create({
      model: MODEL,
      messages: [
        { role: 'system', content: systemPrompt },
        { role: 'user', content: userPrompt },
      ],
      temperature: 0.8,
      max_tokens: 1000,
    })

    const text = response.choices[0]?.message?.content?.trim() || '{}'

    try {
      // Try to extract JSON from potential markdown code blocks
      const jsonMatch = text.match(/\{[\s\S]*\}/)
      const parsed = JSON.parse(jsonMatch ? jsonMatch[0] : text)
      return {
        title: parsed.title || `Adventure in ${params.city}`,
        description: parsed.description || 'Your personal city quest awaits!',
        dayThemes: parsed.dayThemes || Array(params.days).fill('Exploration'),
      }
    } catch {
      console.error('Failed to parse quest plan:', text)
      return {
        title: params.lang === 'ru'
          ? `Приключение в городе ${params.city}`
          : `Adventure in ${params.city}`,
        description: params.lang === 'ru'
          ? 'Твой персональный городской квест ждёт!'
          : 'Your personal city quest awaits!',
        dayThemes: Array(params.days).fill(
          params.lang === 'ru' ? 'Исследование' : 'Exploration'
        ),
      }
    }
  }

  async generatePoint(params: {
    city: string
    dayNumber: number
    totalDays: number
    dayTheme: string
    pace: string
    companions: string
    userComment?: string
    previousPoints: string[]
    lang: string
  }): Promise<GeneratedPoint> {
    const systemPrompt = getSystemPrompt(params.lang)
    const userPrompt = getStepGenerationPrompt(params)

    const response = await client.chat.completions.create({
      model: MODEL,
      messages: [
        { role: 'system', content: systemPrompt },
        { role: 'user', content: userPrompt },
      ],
      temperature: 0.8,
      max_tokens: 500,
    })

    const text = response.choices[0]?.message?.content?.trim() || '{}'

    try {
      const jsonMatch = text.match(/\{[\s\S]*\}/)
      const parsed = JSON.parse(jsonMatch ? jsonMatch[0] : text)
      return {
        title: parsed.title || 'Unknown Location',
        teaserText: parsed.teaserText || 'A mysterious place awaits...',
        locationLat: parsed.locationLat || 0,
        locationLon: parsed.locationLon || 0,
        isLastPointOfDay: parsed.isLastPointOfDay || false,
      }
    } catch {
      console.error('Failed to parse generated point:', text)
      return {
        title: 'Mystery Spot',
        teaserText: params.lang === 'ru'
          ? 'Загадочное место ждёт тебя...'
          : 'A mysterious place awaits...',
        locationLat: 0,
        locationLon: 0,
        isLastPointOfDay: false,
      }
    }
  }

  async generatePointContent(params: {
    city: string
    pointTitle: string
    dayNumber: number
    companions: string
    pace: string
    lang: string
  }): Promise<PointContent> {
    const systemPrompt = getSystemPrompt(params.lang)
    const userPrompt = getPointContentPrompt(params)

    const response = await client.chat.completions.create({
      model: MODEL,
      messages: [
        { role: 'system', content: systemPrompt },
        { role: 'user', content: userPrompt },
      ],
      temperature: 0.7,
      max_tokens: 2000,
    })

    const text = response.choices[0]?.message?.content?.trim() || ''
    return { contentText: text }
  }

  async generateReaction(params: {
    eventType: string
    pointTitle?: string
    city: string
    lang: string
    companions: string
    pace: string
  }): Promise<string> {
    const systemPrompt = getSystemPrompt(params.lang)
    const userPrompt = getReactionPrompt(params)

    const response = await client.chat.completions.create({
      model: MODEL,
      messages: [
        { role: 'system', content: systemPrompt },
        { role: 'user', content: userPrompt },
      ],
      temperature: 0.8,
      max_tokens: 300,
    })

    return response.choices[0]?.message?.content?.trim() || ''
  }
}

export const aiService = new AIService()