package db

import "time"

type SpreadFunnelRow struct {
	BuildID    string `json:"build_id"`
	WorkerName string `json:"worker_name"`
	Count      int    `json:"count"`
	USBSpread  int    `json:"usb_spread_count"`
}

type SpreadFunnelStats struct {
	ByBuild          []SpreadFunnelRow `json:"by_build"`
	NewConnectsToday int               `json:"new_connects_today"`
	TotalAgents      int               `json:"total_agents"`
}

func (d *Database) GetSpreadFunnelStats(since time.Time) (*SpreadFunnelStats, error) {
	stats := &SpreadFunnelStats{ByBuild: []SpreadFunnelRow{}}

	if err := d.QueryRow(`SELECT COUNT(*) FROM agents WHERE created_at >= date('now')`).Scan(&stats.NewConnectsToday); err != nil {
		return nil, err
	}
	if err := d.QueryRow(`SELECT COUNT(*) FROM agents`).Scan(&stats.TotalAgents); err != nil {
		return nil, err
	}

	rows, err := d.Query(`
		SELECT COALESCE(NULLIF(build_id,''), 'unknown') AS build_id,
		       COALESCE(NULLIF(worker_name,''), name) AS worker_name,
		       COUNT(*) AS cnt,
		       SUM(CASE WHEN usb_spread = 1 THEN 1 ELSE 0 END) AS usb_cnt
		FROM agents
		WHERE created_at >= ?
		GROUP BY build_id, worker_name
		ORDER BY cnt DESC`,
		since,
	)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	for rows.Next() {
		var r SpreadFunnelRow
		if err := rows.Scan(&r.BuildID, &r.WorkerName, &r.Count, &r.USBSpread); err != nil {
			return nil, err
		}
		stats.ByBuild = append(stats.ByBuild, r)
	}
	return stats, rows.Err()
}