import type { GeneratedQuery, Opportunity, EnhancedProductAnalysis } from './types'

interface SearchResult {
  title: string
  url: string
  snippet: string
  platform: string
  raw?: any
}

export async function executeSearches(
  queries: GeneratedQuery[],
  onProgress?: (progress: { current: number; total: number; platform: string }) => void
): Promise<SearchResult[]> {
  const results: SearchResult[] = []
  
  // Group by platform
  const byPlatform = new Map<string, GeneratedQuery[]>()
  queries.forEach(q => {
    if (!byPlatform.has(q.platform)) byPlatform.set(q.platform, [])
    byPlatform.get(q.platform)!.push(q)
  })
  
  let completed = 0
  
  for (const [platform, platformQueries] of byPlatform) {
    console.log(`Searching ${platform}: ${platformQueries.length} queries`)
    
    for (const query of platformQueries) {
      try {
        const searchResults = await executeSingleSearch(query)
        results.push(...searchResults)
        
        completed++
        onProgress?.({ current: completed, total: queries.length, platform })
        
        // Rate limiting - 1 second between requests
        await delay(1000)
      } catch (err) {
        console.error(`Search failed for ${platform}:`, err)
      }
    }
  }
  
  return results
}

async function executeSingleSearch(query: GeneratedQuery): Promise<SearchResult[]> {
  if (!process.env.SERPER_API_KEY) {
    throw new Error('SERPER_API_KEY is not configured.')
  }

  return searchWithSerper(query)
}

async function searchWithSerper(query: GeneratedQuery): Promise<SearchResult[]> {
  const response = await fetch('https://google.serper.dev/search', {
    method: 'POST',
    headers: {
      'X-API-KEY': process.env.SERPER_API_KEY!,
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ 
      q: query.query, 
      num: 5,
      gl: 'us',
      hl: 'en'
    })
  })

  if (!response.ok) {
    throw new Error(`Serper API error: ${response.status}`)
  }

  const data = await response.json()
  
  return (data.organic || []).map((r: any) => ({
    title: r.title,
    url: r.link,
    snippet: r.snippet,
    platform: query.platform,
    raw: r
  }))
}

export function scoreOpportunities(
  results: SearchResult[],
  analysis: EnhancedProductAnalysis
): Opportunity[] {
  const opportunities: Opportunity[] = []
  const seen = new Set<string>()
  
  for (const result of results) {
    if (seen.has(result.url)) continue
    seen.add(result.url)
    
    const scored = scoreSingleOpportunity(result, analysis)
    opportunities.push(scored)
  }
  
  return opportunities.sort((a, b) => b.relevanceScore - a.relevanceScore)
}

function scoreSingleOpportunity(
  result: SearchResult,
  analysis: EnhancedProductAnalysis
): Opportunity {
  const content = (result.title + ' ' + result.snippet).toLowerCase()
  
  // 1. Keyword matching (max 30 points)
  const matchedKeywords = analysis.keywords.filter(k => 
    content.includes(k.term.toLowerCase())
  )
  const keywordScore = Math.min(matchedKeywords.length * 5, 30)
  
  // 2. Problem matching (max 25 points)
  const matchedProblems = analysis.problemsSolved.filter(p =>
    content.includes(p.problem.toLowerCase()) ||
    p.searchTerms.some(t => content.includes(t.toLowerCase()))
  )
  const problemScore = matchedProblems.reduce((sum, p) => 
    sum + (p.severity === 'high' ? 10 : p.severity === 'medium' ? 5 : 2), 0
  )
  const cappedProblemScore = Math.min(problemScore, 25)
  
  // 3. Emotional intensity (max 20 points)
  const emotionalTerms = [
    'frustrated', 'hate', 'terrible', 'sucks', 'awful', 'nightmare',
    'desperate', 'urgent', 'please help', 'dying', 'killing me',
    'fed up', 'tired of', 'annoying', 'painful'
  ]
  const emotionalMatches = emotionalTerms.filter(t => content.includes(t))
  const emotionalScore = Math.min(emotionalMatches.length * 5, 20)
  
  // 4. Competitor mention (max 15 points)
  const competitorMentioned = analysis.competitors.some(c =>
    content.includes(c.name.toLowerCase())
  )
  const competitorScore = competitorMentioned ? 15 : 0
  
  // Detect intent
  let intent: Opportunity['intent'] = 'looking'
  if (content.includes('frustrated') || content.includes('hate') || emotionalMatches.length > 0) {
    intent = 'frustrated'
  } else if (content.includes('vs') || content.includes('compare') || content.includes('alternative')) {
    intent = 'comparing'
  } else if (content.includes('how to') || content.includes('tutorial')) {
    intent = 'learning'
  } else if (content.includes('recommend') || content.includes('suggest')) {
    intent = 'recommending'
  }
  
  // Generate approach
  const problemContext = matchedProblems[0]?.problem || 'their current challenges'
  const suggestedApproach = generateApproach(intent, analysis.productName, problemContext)
  
  const softPitch = intent === 'frustrated' || intent === 'learning'
  
  const totalScore = (keywordScore + cappedProblemScore + emotionalScore + competitorScore) / 90
  
  return {
    id: Math.random().toString(36).substring(2, 15),
    title: result.title,
    url: result.url,
    snippet: result.snippet.slice(0, 300),
    platform: result.platform,
    source: result.platform,
    relevanceScore: Math.min(totalScore, 1),
    emotionalIntensity: emotionalScore > 10 ? 'high' : emotionalScore > 5 ? 'medium' : 'low',
    intent,
    matchedKeywords: matchedKeywords.map(k => k.term),
    matchedProblems: matchedProblems.map(p => p.problem),
    suggestedApproach,
    softPitch,
    status: 'new',
    scoringBreakdown: {
      keywordMatches: keywordScore,
      problemMatches: cappedProblemScore,
      emotionalIntensity: emotionalScore,
      competitorMention: competitorScore,
      recency: 0,
      engagement: 0
    }
  }
}

function generateApproach(
  intent: Opportunity['intent'],
  productName: string,
  problemContext: string
): string {
  switch (intent) {
    case 'frustrated':
      return `Empathize with their frustration about ${problemContext}. Share how ${productName} helps teams overcome this specific pain point.`
    
    case 'comparing':
      return `They're evaluating options. Highlight ${productName}'s unique approach to ${problemContext}. Be honest about trade-offs.`
    
    case 'looking':
      return `They're actively searching. Introduce ${productName} as purpose-built for ${problemContext}. Mention 2-3 specific features.`
    
    case 'learning':
      return `Provide genuine help with ${problemContext}. Mention ${productName} as the solution that worked for your team.`
    
    case 'recommending':
      return `Share a genuine recommendation for ${productName}. Focus on how it transformed ${problemContext} for your team.`
  }
}

function delay(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms))
}