const nocodbService = require('../services/nocodb');
const logger = require('../utils/logger');
const config = require('../config');

class DashboardController {
    async getStats(req, res) {
        try {
            // Get all locations for support level stats
            const locationsResponse = await nocodbService.getAll(config.nocodb.tableId);
            const locations = locationsResponse.list || [];
            
            // Calculate support level distribution
            const supportLevels = { '1': 0, '2': 0, '3': 0, '4': 0 };
            let signRequests = 0;
            
            locations.forEach(loc => {
                if (loc['Support Level']) {
                    supportLevels[loc['Support Level']]++;
                }
                if (loc.Sign || loc.sign) {
                    signRequests++;
                }
            });
            
            // Calculate overall score (weighted average)
            const totalResponses = Object.values(supportLevels).reduce((a, b) => a + b, 0);
            const weightedScore = (supportLevels['1'] * 4 + supportLevels['2'] * 3 + 
                                 supportLevels['3'] * 2 + supportLevels['4'] * 1) / 
                                 (totalResponses || 1);
            
            // Get user stats
            const usersResponse = await nocodbService.getAll(config.nocodb.loginSheetId);
            const users = usersResponse.list || [];
            
            // Get daily entry counts for the last 30 days
            const thirtyDaysAgo = new Date();
            thirtyDaysAgo.setDate(thirtyDaysAgo.getDate() - 30);
            
            const dailyEntries = {};
            locations.forEach(loc => {
                const createdAt = new Date(loc.CreatedAt || loc.created_at);
                if (createdAt >= thirtyDaysAgo) {
                    const dateKey = createdAt.toISOString().split('T')[0];
                    dailyEntries[dateKey] = (dailyEntries[dateKey] || 0) + 1;
                }
            });
            
            res.json({
                success: true,
                data: {
                    supportLevels,
                    signRequests,
                    totalLocations: locations.length,
                    overallScore: weightedScore.toFixed(2),
                    totalUsers: users.length,
                    dailyEntries
                }
            });
            
        } catch (error) {
            logger.error('Error fetching dashboard stats:', error);
            res.status(500).json({
                success: false,
                error: 'Failed to fetch dashboard statistics'
            });
        }
    }
}

module.exports = new DashboardController();