package platform

import (
	"net/url"
	"strconv"
	"strings"
)

type SQLQuery struct {
	Text string
	Args []any
}

func buildVehicleListSQL(query url.Values) SQLQuery {
	limit := parsePositive(query.Get("limit"), 20)
	offset := parsePositive(query.Get("offset"), 0)
	args := []any{}
	where := []string{"1 = 1"}
	if keyword := strings.TrimSpace(query.Get("keyword")); keyword != "" {
		where = append(where, "(b.vin LIKE ? OR b.plate LIKE ? OR b.phone LIKE ? OR b.oem LIKE ?)")
		like := "%" + keyword + "%"
		args = append(args, like, like, like, like)
	}
	if protocol := strings.TrimSpace(query.Get("protocol")); protocol != "" {
		where = append(where, "s.protocol = ?")
		args = append(args, protocol)
	}
	args = append(args, limit, offset)
	return SQLQuery{
		Text: `SELECT b.vin, b.plate, b.phone, b.oem, COALESCE(s.protocol, '') AS protocol, ` +
			`CASE WHEN s.updated_at >= DATE_SUB(NOW(), INTERVAL 1 MINUTE) THEN 1 ELSE 0 END AS online, ` +
			`COALESCE(DATE_FORMAT(s.updated_at, '%Y-%m-%d %H:%i:%s'), '') AS last_seen, ` +
			`COALESCE(CONCAT(l.longitude, ',', l.latitude), '') AS location_text, ` +
			`CASE WHEN b.vin IS NOT NULL AND b.vin <> '' THEN 100 ELSE 0 END AS binding_score ` +
			`FROM vehicle_identity_binding b ` +
			`LEFT JOIN vehicle_realtime_snapshot s ON s.vin = b.vin ` +
			`LEFT JOIN vehicle_realtime_location l ON l.vin = b.vin ` +
			`WHERE ` + strings.Join(where, " AND ") + ` ORDER BY s.updated_at DESC LIMIT ? OFFSET ?`,
		Args: args,
	}
}

func buildDailyMileageSQL(query url.Values) SQLQuery {
	limit := parsePositive(query.Get("limit"), 20)
	offset := parsePositive(query.Get("offset"), 0)
	args := []any{}
	where := []string{"1 = 1"}
	if vin := strings.TrimSpace(query.Get("vin")); vin != "" {
		where = append(where, "m.vin = ?")
		args = append(args, vin)
	}
	if dateFrom := strings.TrimSpace(query.Get("dateFrom")); dateFrom != "" {
		where = append(where, "m.stat_date >= ?")
		args = append(args, dateFrom)
	}
	if dateTo := strings.TrimSpace(query.Get("dateTo")); dateTo != "" {
		where = append(where, "m.stat_date <= ?")
		args = append(args, dateTo)
	}
	args = append(args, limit, offset)
	return SQLQuery{
		Text: `SELECT m.vin, COALESCE(b.plate, '') AS plate, DATE_FORMAT(m.stat_date, '%Y-%m-%d') AS stat_date, ` +
			`m.first_total_mileage_km, m.latest_total_mileage_km, m.daily_mileage_km, m.protocol ` +
			`FROM vehicle_daily_mileage m LEFT JOIN vehicle_identity_binding b ON b.vin = m.vin ` +
			`WHERE ` + strings.Join(where, " AND ") + ` ORDER BY m.stat_date DESC LIMIT ? OFFSET ?`,
		Args: args,
	}
}

func buildLimitOffset(query url.Values) (int, int) {
	return parsePositive(query.Get("limit"), 20), parsePositive(query.Get("offset"), 0)
}

func parseLimitOffset(rawLimit, rawOffset string) (int, int) {
	return parsePositive(rawLimit, 20), parsePositive(rawOffset, 0)
}

func mustInt(value string) int {
	n, _ := strconv.Atoi(value)
	return n
}