/**
 * QUIXZOOM Coverage Gap Analyzer
 * 
 * Analyserar täckningsgap och genererar uppdrag.
 */

class CoverageGapAnalyzer {
  constructor(datasetManager) {
    this.manager = datasetManager;
  }

  /**
   * Analysera gap för en stad
   */
  analyzeCity(cityId) {
    const city = this.manager.getReferenceCity(cityId);
    if (!city) return null;
    
    const report = this.manager.getCoverageReport(cityId);
    if (!report) return null;
    
    const analysis = {
      city: city.name,
      overallCoverage: report.overall,
      criticalGaps: [],
      warnings: [],
      opportunities: [],
      missions: [],
    };
    
    // Analysera varje kategori
    for (const [category, coverage] of Object.entries(report.categories)) {
      const percentage = parseFloat(coverage.percentage);
      
      // Critical: < 50%
      if (percentage < 50) {
        analysis.criticalGaps.push({
          category,
          coverage: percentage,
          message: `${category}: Only ${percentage}% coverage. Critical gap.`,
        });
        
        // Generera uppdrag
        analysis.missions.push(this.generateMission(city, category, coverage, 'critical'));
      }
      // Warning: 50-80%
      else if (percentage < 80) {
        analysis.warnings.push({
          category,
          coverage: percentage,
          message: `${category}: ${percentage}% coverage. Below target.`,
        });
        
        analysis.missions.push(this.generateMission(city, category, coverage, 'warning'));
      }
      
      // Analysera tidpunkter
      if (coverage.byTimeOfDay) {
        const nightCoverage = coverage.byTimeOfDay.night || 0;
        const totalNight = (coverage.byTimeOfDay.night || 0) + (coverage.byTimeOfDay.day || 0) + (coverage.byTimeOfDay.evening || 0);
        const nightPercentage = totalNight > 0 ? (nightCoverage / totalNight * 100).toFixed(1) : 0;
        
        if (nightPercentage < 20) {
          analysis.opportunities.push({
            category,
            type: 'night_coverage',
            message: `${category}: Only ${nightPercentage}% night coverage. Collect night observations.`,
            potentialValue: 'high',
          });
          
          analysis.missions.push(this.generateTimeMission(city, category, 'night'));
        }
      }
      
      // Analysera väder
      if (coverage.byWeather) {
        const rainCoverage = coverage.byWeather.rain || 0;
        if (rainCoverage < 50) {
          analysis.opportunities.push({
            category,
            type: 'weather_coverage',
            message: `${category}: Only ${rainCoverage} rain observations. Collect rainy weather data.`,
            potentialValue: 'medium',
          });
        }
      }
    }
    
    // Sortera uppdrag efter prioritet
    analysis.missions.sort((a, b) => {
      const priorityOrder = { critical: 0, warning: 1, opportunity: 2 };
      return priorityOrder[a.priority] - priorityOrder[b.priority];
    });
    
    return analysis;
  }

  /**
   * Generera uppdrag för gap
   */
  generateMission(city, category, coverage, priority) {
    const needed = Math.ceil((100 - parseFloat(coverage.percentage)) * 10); // 10 obs per %
    
    return {
      id: `mission_${city.id}_${category}_${Date.now()}`,
      city: city.name,
      category,
      priority,
      type: 'coverage_gap',
      description: `Collect ${needed} ${category} observations in ${city.name}`,
      target: {
        count: needed,
        coverage: 100,
      },
      current: {
        count: coverage.found,
        coverage: parseFloat(coverage.percentage),
      },
      conditions: {
        timeOfDay: this.suggestTimeOfDay(coverage),
        weather: this.suggestWeather(coverage),
        season: this.suggestSeason(coverage),
      },
      reward: this.calculateReward(priority, needed),
      expiresAt: new Date(Date.now() + 7 * 86400000).toISOString(), // 7 dagar
    };
  }

  /**
   * Generera tidsbaserat uppdrag
   */
  generateTimeMission(city, category, timeOfDay) {
    return {
      id: `mission_${city.id}_${category}_${timeOfDay}_${Date.now()}`,
      city: city.name,
      category,
      priority: 'opportunity',
      type: 'time_coverage',
      description: `Collect ${category} observations during ${timeOfDay} in ${city.name}`,
      target: {
        count: 50,
        timeOfDay,
      },
      conditions: {
        timeOfDay,
        weather: 'any',
      },
      reward: this.calculateReward('opportunity', 50),
      expiresAt: new Date(Date.now() + 14 * 86400000).toISOString(), // 14 dagar
    };
  }

  /**
   * Föreslå tid på dygnet
   */
  suggestTimeOfDay(coverage) {
    const times = coverage.byTimeOfDay || {};
    const min = Math.min(times.day || 0, times.evening || 0, times.night || 0);
    
    if (min === times.night || 0) return 'night';
    if (min === times.evening || 0) return 'evening';
    return 'day';
  }

  /**
   * Föreslå väder
   */
  suggestWeather(coverage) {
    const weather = coverage.byWeather || {};
    const min = Math.min(weather.clear || 0, weather.cloudy || 0, weather.rain || 0);
    
    if (min === weather.rain || 0) return 'rain';
    if (min === weather.cloudy || 0) return 'cloudy';
    return 'any';
  }

  /**
   * Föreslå säsong
   */
  suggestSeason(coverage) {
    const seasons = coverage.bySeason || {};
    const min = Math.min(seasons.summer || 0, seasons.winter || 0, seasons.spring || 0, seasons.fall || 0);
    
    if (min === seasons.winter || 0) return 'winter';
    if (min === seasons.spring || 0) return 'spring';
    if (min === seasons.fall || 0) return 'fall';
    return 'any';
  }

  /**
   * Beräkna belöning
   */
  calculateReward(priority, count) {
    const baseReward = {
      critical: 10,
      warning: 5,
      opportunity: 3,
    };
    
    return baseReward[priority] * count;
  }

  /**
   * Generera rapport för alla städer
   */
  generateGlobalReport() {
    const cities = this.manager.listReferenceCities();
    const report = {
      generatedAt: new Date().toISOString(),
      totalCities: cities.length,
      cities: [],
      globalGaps: [],
      recommendedMissions: [],
    };
    
    for (const city of cities) {
      const analysis = this.analyzeCity(city.id);
      if (analysis) {
        report.cities.push(analysis);
        report.recommendedMissions.push(...analysis.missions);
      }
    }
    
    // Identifiera globala gap (saknas i alla städer)
    const categoryCoverage = {};
    for (const city of report.cities) {
      for (const gap of city.criticalGaps) {
        if (!categoryCoverage[gap.category]) {
          categoryCoverage[gap.category] = [];
        }
        categoryCoverage[gap.category].push(city.city);
      }
    }
    
    for (const [category, cities] of Object.entries(categoryCoverage)) {
      if (cities.length === report.totalCities) {
        report.globalGaps.push({
          category,
          affectedCities: cities,
          message: `${category} is critically underrepresented in all cities`,
        });
      }
    }
    
    // Sortera uppdrag
    report.recommendedMissions.sort((a, b) => b.reward - a.reward);
    
    return report;
  }
}

module.exports = CoverageGapAnalyzer;

// Demo
if (require.main === module) {
  const UrbanFoundationDatasetManager = require('./manager');
  const manager = new UrbanFoundationDatasetManager();
  
  // Lägg till städer med låg coverage
  const bangkok = manager.addReferenceCity({
    name: 'Bangkok',
    country: 'TH',
    climate: 'tropical',
    type: 'tropical_megacity',
    location: { lat: 13.7563, lng: 100.5018 },
  });
  
  // Lägg till coverage med gap
  manager.updateCoverage(bangkok.id, 'street_lamp', {
    total: 1000,
    found: 940,
    byTimeOfDay: { day: 500, evening: 300, night: 140 },
  });
  
  manager.updateCoverage(bangkok.id, 'traffic_sign', {
    total: 500,
    found: 200,
    byTimeOfDay: { day: 150, evening: 40, night: 10 },
  });
  
  manager.updateCoverage(bangkok.id, 'manhole', {
    total: 300,
    found: 80,
    byTimeOfDay: { day: 60, evening: 15, night: 5 },
  });
  
  // Analysera
  const analyzer = new CoverageGapAnalyzer(manager);
  const analysis = analyzer.analyzeCity(bangkok.id);
  
  console.log('\n=== BANGKOK GAP ANALYSIS ===');
  console.log(JSON.stringify(analysis, null, 2));
  
  // Generera global rapport
  const globalReport = analyzer.generateGlobalReport();
  console.log('\n=== GLOBAL REPORT ===');
  console.log(`Total missions: ${globalReport.recommendedMissions.length}`);
  console.log(`Top mission: ${globalReport.recommendedMissions[0]?.description}`);
}