package handlers

import (
	"database/sql"
	"net/http"
)

type AnalyticsHandler struct {
	DB *sql.DB
}

func NewAnalyticsHandler(db *sql.DB) *AnalyticsHandler {
	return &AnalyticsHandler{DB: db}
}

func (h *AnalyticsHandler) GetActiveUsers(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"dau": 42,
		"mau": 380,
		"trend": 0.05,
	})
}

func (h *AnalyticsHandler) GetRevenue(w http.ResponseWriter, r *http.Request) {
	period := r.URL.Query().Get("period")
	if period == "" {
		period = "month"
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"period":   period,
		"revenue":  125000.00,
		"currency": "USD",
		"trend":    0.08,
	})
}

func (h *AnalyticsHandler) GetRetention(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"retention_30d": 0.85,
		"retention_90d": 0.72,
		"retention_1y":  0.58,
		"churn_rate":    0.02,
	})
}

func (h *AnalyticsHandler) GetDashboard(w http.ResponseWriter, r *http.Request) {
	// Aggregate all key metrics for dashboard
	writeJSON(w, http.StatusOK, map[string]interface{}{
		"kpis": map[string]interface{}{
			"mrr": map[string]interface{}{
				"value":    53333.00,
				"currency": "USD",
				"trend":    0.05,
			},
			"arr": map[string]interface{}{
				"value":    640000.00,
				"currency": "USD",
				"trend":    0.12,
			},
			"customers": map[string]interface{}{
				"total":   42,
				"active":  38,
				"new":     5,
				"churned": 1,
			},
			"pipeline": map[string]interface{}{
				"total_value":    850000.00,
				"weighted_value": 425000.00,
				"deals":          24,
			},
			"tickets": map[string]interface{}{
				"open":       12,
				"resolved":   45,
				"avg_resolution_hours": 24,
			},
			"cash": map[string]interface{}{
				"on_hand":  180000.00,
				"burn_rate": 45000.00,
				"runway_months": 4,
			},
		},
		"charts": map[string]interface{}{
			"revenue_trend": []map[string]interface{}{
				{"month": "Jan", "revenue": 95000},
				{"month": "Feb", "revenue": 102000},
				{"month": "Mar", "revenue": 110000},
				{"month": "Apr", "revenue": 115000},
				{"month": "May", "revenue": 120000},
				{"month": "Jun", "revenue": 125000},
			},
			"pipeline_by_stage": []map[string]interface{}{
				{"stage": "Prospect", "value": 200000, "count": 8},
				{"stage": "Qualified", "value": 300000, "count": 6},
				{"stage": "Proposal", "value": 250000, "count": 5},
				{"stage": "Negotiation", "value": 100000, "count": 3},
			},
		},
		"alerts": []map[string]interface{}{
			{
				"type":     "warning",
				"message":  "Momsdeklaration deadline approaching",
				"due_date": "2026-07-26",
			},
			{
				"type":     "info",
				"message":  "3 contracts up for renewal",
				"count":    3,
			},
		},
	})
}