import type { JiraConfig } from './jira';
import { Task } from '@/lib/types';

export interface JiraWeeklyMetrics {
  totalJiraTasks: number;
  completedJiraTasks: number;
  totalStoryPoints: number; // Estimation basée sur le type de ticket
  projectsContributed: string[];
  ticketTypes: { [type: string]: number };
  jiraLinks: Array<{
    key: string;
    title: string;
    status: string;
    type: string;
    url: string;
    estimatedPoints: number;
  }>;
}

export class JiraSummaryService {
  /**
   * Enrichit les tâches hebdomadaires avec des métriques Jira
   */
  static async getJiraWeeklyMetrics(
    weeklyTasks: Task[], 
    jiraConfig?: JiraConfig
  ): Promise<JiraWeeklyMetrics | null> {
    
    if (!jiraConfig?.baseUrl || !jiraConfig?.email || !jiraConfig?.apiToken) {
      return null;
    }

    const jiraTasks = weeklyTasks.filter(task => 
      task.source === 'jira' && task.jiraKey && task.jiraProject
    );

    if (jiraTasks.length === 0) {
      return {
        totalJiraTasks: 0,
        completedJiraTasks: 0,
        totalStoryPoints: 0,
        projectsContributed: [],
        ticketTypes: {},
        jiraLinks: []
      };
    }

    // Calculer les métriques basiques
    const completedJiraTasks = jiraTasks.filter(task => task.status === 'done');
    const projectsContributed = [...new Set(jiraTasks.map(task => task.jiraProject).filter((project): project is string => Boolean(project)))];
    
    // Analyser les types de tickets
    const ticketTypes: { [type: string]: number } = {};
    jiraTasks.forEach(task => {
      const type = task.jiraType || 'Unknown';
      ticketTypes[type] = (ticketTypes[type] || 0) + 1;
    });

    // Estimer les story points basés sur le type de ticket
    const estimateStoryPoints = (type: string): number => {
      const typeMapping: { [key: string]: number } = {
        'Story': 3,
        'Task': 2,
        'Bug': 1,
        'Epic': 8,
        'Sub-task': 1,
        'Improvement': 2,
        'New Feature': 5,
        'défaut': 1, // French
        'amélioration': 2, // French
        'nouvelle fonctionnalité': 5, // French
      };
      
      return typeMapping[type] || typeMapping[type?.toLowerCase()] || 2; // Défaut: 2 points
    };

    const totalStoryPoints = jiraTasks.reduce((sum, task) => {
      return sum + estimateStoryPoints(task.jiraType || '');
    }, 0);

    // Créer les liens Jira
    const jiraLinks = jiraTasks.map(task => ({
      key: task.jiraKey || '',
      title: task.title,
      status: task.status,
      type: task.jiraType || 'Unknown',
      url: `${jiraConfig.baseUrl.replace('/rest/api/3', '')}/browse/${task.jiraKey}`,
      estimatedPoints: estimateStoryPoints(task.jiraType || '')
    }));

    return {
      totalJiraTasks: jiraTasks.length,
      completedJiraTasks: completedJiraTasks.length,
      totalStoryPoints,
      projectsContributed,
      ticketTypes,
      jiraLinks
    };
  }

  /**
   * Récupère la configuration Jira depuis les préférences utilisateur
   */
  static async getJiraConfig(): Promise<JiraConfig | null> {
    try {
      // Import dynamique pour éviter les cycles de dépendance
      const { userPreferencesService } = await import('./user-preferences');
      const preferences = await userPreferencesService.getAllPreferences();
      
      if (!preferences.jiraConfig?.baseUrl || 
          !preferences.jiraConfig?.email || 
          !preferences.jiraConfig?.apiToken) {
        return null;
      }

      return {
        baseUrl: preferences.jiraConfig.baseUrl,
        email: preferences.jiraConfig.email,
        apiToken: preferences.jiraConfig.apiToken,
        projectKey: preferences.jiraConfig.projectKey,
        ignoredProjects: preferences.jiraConfig.ignoredProjects
      };
    } catch (error) {
      console.error('Erreur lors de la récupération de la config Jira:', error);
      return null;
    }
  }

  /**
   * Génère des insights business basés sur les métriques Jira
   */
  static generateBusinessInsights(jiraMetrics: JiraWeeklyMetrics): string[] {
    const insights: string[] = [];

    if (jiraMetrics.totalJiraTasks === 0) {
      insights.push("Aucune tâche Jira cette semaine. Concentré sur des tâches internes ?");
      return insights;
    }

    // Insights sur la completion
    const completionRate = (jiraMetrics.completedJiraTasks / jiraMetrics.totalJiraTasks) * 100;
    if (completionRate >= 80) {
      insights.push(`🎯 Excellent taux de completion Jira: ${completionRate.toFixed(0)}%`);
    } else if (completionRate < 50) {
      insights.push(`⚠️ Taux de completion Jira faible: ${completionRate.toFixed(0)}%. Revoir les estimations ?`);
    }

    // Insights sur les story points
    if (jiraMetrics.totalStoryPoints > 0) {
      insights.push(`📊 Estimation: ${jiraMetrics.totalStoryPoints} story points traités cette semaine`);
      
      const avgPointsPerTask = jiraMetrics.totalStoryPoints / jiraMetrics.totalJiraTasks;
      if (avgPointsPerTask > 4) {
        insights.push(`🏋️ Travail sur des tâches complexes (${avgPointsPerTask.toFixed(1)} pts/tâche en moyenne)`);
      }
    }

    // Insights sur les projets
    if (jiraMetrics.projectsContributed.length > 1) {
      insights.push(`🤝 Contribution multi-projets: ${jiraMetrics.projectsContributed.join(', ')}`);
    } else if (jiraMetrics.projectsContributed.length === 1) {
      insights.push(`🎯 Focus sur le projet ${jiraMetrics.projectsContributed[0]}`);
    }

    // Insights sur les types de tickets
    const bugCount = jiraMetrics.ticketTypes['Bug'] || jiraMetrics.ticketTypes['défaut'] || 0;
    const totalTickets = Object.values(jiraMetrics.ticketTypes).reduce((sum, count) => sum + count, 0);
    
    if (bugCount > 0) {
      const bugRatio = (bugCount / totalTickets) * 100;
      if (bugRatio > 50) {
        insights.push(`🐛 Semaine focalisée sur la correction de bugs (${bugRatio.toFixed(0)}%)`);
      } else if (bugRatio < 20) {
        insights.push(`✨ Semaine productive avec peu de bugs (${bugRatio.toFixed(0)}%)`);
      }
    }

    return insights;
  }
}