package handlers

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

// UnifiedHandler hanterar allt i ett enda API
type UnifiedHandler struct {
	DB *sql.DB
}

func NewUnifiedHandler(db *sql.DB) *UnifiedHandler {
	return &UnifiedHandler{DB: db}
}

// GetUnifiedDashboard returnerar allt på ett ställe
func (h *UnifiedHandler) GetUnifiedDashboard(w http.ResponseWriter, r *http.Request) {
	// 1. Hämta CRM-data från BOC-databasen
	customers := []map[string]interface{}{}
	customerRows, err := h.DB.Query(`
		SELECT id, name, email, status, created_at
		FROM boc_customers
		WHERE status = 'active'
		ORDER BY created_at DESC
	`)
	if err == nil {
		defer customerRows.Close()
		for customerRows.Next() {
			var c map[string]interface{}
			var id, name, email, status string
			var createdAt sql.NullTime
			if err := customerRows.Scan(&id, &name, &email, &status, &createdAt); err != nil {
				continue
			}
			c = map[string]interface{}{
				"id":     id,
				"name":   name,
				"email":  email,
				"status": status,
			}
			if createdAt.Valid {
				c["created_at"] = createdAt.Time.Format("2006-01-02")
			}
			customers = append(customers, c)
		}
	}

	// 2. Hämta deals från BOC-databasen
	deals := []map[string]interface{}{}
	dealRows, err := h.DB.Query(`
		SELECT id, name, customer_id, value, currency, stage, status
		FROM boc_deals
		ORDER BY 
			CASE stage
				WHEN 'negotiation' THEN 1
				WHEN 'proposal' THEN 2
				WHEN 'closed' THEN 3
				ELSE 4
			END,
			value DESC
	`)
	if err == nil {
		defer dealRows.Close()
		for dealRows.Next() {
			var d map[string]interface{}
			var id, name, customerID, currency, stage, status string
			var value float64
			if err := dealRows.Scan(&id, &name, &customerID, &value, &currency, &stage, &status); err != nil {
				continue
			}
			d = map[string]interface{}{
				"id":          id,
				"name":        name,
				"customer_id": customerID,
				"value":       value,
				"currency":    currency,
				"stage":       stage,
				"status":      status,
			}
			deals = append(deals, d)
		}
	}

	// 3. Hämta mail-statistik
	mailCount := 0
	mailRows, err := h.DB.Query(`
		SELECT COUNT(*) FROM boc_mail_messages
	`)
	if err == nil && mailRows.Next() {
		mailRows.Scan(&mailCount)
		mailRows.Close()
	}

	// 4. Hämta analytics
	var revenue, moms float64
	analyticsRows, err := h.DB.Query(`
		SELECT kpi_key, value FROM boc_analytics_kpis
		WHERE kpi_key IN ('revenue_h1', 'moms_att_betala')
	`)
	if err == nil {
		defer analyticsRows.Close()
		for analyticsRows.Next() {
			var key string
			var value float64
			if err := analyticsRows.Scan(&key, &value); err != nil {
				continue
			}
			if key == "revenue_h1" {
				revenue = value
			} else if key == "moms_att_betala" {
				moms = value
			}
		}
	}

	// 5. Hämta team
	team := []map[string]interface{}{}
	teamRows, err := h.DB.Query(`
		SELECT first_name, last_name, position, department, status
		FROM boc_employees
		WHERE status = 'active'
		ORDER BY department, first_name
	`)
	if err == nil {
		defer teamRows.Close()
		for teamRows.Next() {
			var firstName, lastName, position, department, status string
			if err := teamRows.Scan(&firstName, &lastName, &position, &department, &status); err != nil {
				continue
			}
			team = append(team, map[string]interface{}{
				"name":       firstName + " " + lastName,
				"position":   position,
				"department": department,
				"status":     status,
			})
		}
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok": true,
		"dashboard": map[string]interface{}{
			"crm": map[string]interface{}{
				"customers": customers,
				"deals":     deals,
				"total_pipeline": calculatePipeline(deals),
			},
			"finance": map[string]interface{}{
				"revenue": revenue,
				"moms":    moms,
			},
			"mail": map[string]interface{}{
				"total_messages": mailCount,
			},
			"team": team,
		},
	})
}

func calculatePipeline(deals []map[string]interface{}) float64 {
	var total float64
	for _, deal := range deals {
		if status, ok := deal["status"].(string); ok && status == "open" {
			if value, ok := deal["value"].(float64); ok {
				total += value
			}
		}
	}
	return total
}