package bus

import (
    "fmt"
    "sort"
    "strings"
)

type QueryResult struct {
    Schedules *map[BusStop] *BusStopBuses
    Lang string
    Error error
    Query *QueryObject
}

func writeShortRoute( lang *string, sb *strings.Builder, b *BusStop ) {
    if b.PrevStop() != nil {
        sb.WriteString( (*b.PrevStop().Name)[ *lang ] )
        sb.WriteString( " > " )
    }

    sb.WriteString( "**" )
    sb.WriteString( (*b.Name)[ *lang ] )
    sb.WriteString( "**" )

    if b.NextStop() != nil {
        sb.WriteString( " > " )
        sb.WriteString( (*b.NextStop().Name)[ *lang ] )
    }

    sb.WriteString( "\n" )
}

type ByRouteId []BusStop

func (a ByRouteId) Len() int           { return len(a) }
func (a ByRouteId) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a ByRouteId) Less(i, j int) bool { return a[i].RouteId < a[j].RouteId }

func ( result QueryResult ) Message() string {

    if result.Error != nil {
        return fmt.Sprintf( "%s", result.Error )
    }

    sb := strings.Builder{}

    if result.Schedules == nil {

        query := *result.Query
        if query.Route == "" {
            sort.Sort( ByRouteId( *query.BusStops ) )
            for _, busStop := range *query.BusStops {
                sb.WriteString( busStop.RouteId )
                sb.WriteString( " " )
                writeShortRoute( &result.Lang, &sb, &busStop )
            }
        } else if query.BusStops == nil && query.RouteStarts != nil {
            for d, b := range *query.RouteStarts {
                sb.WriteString( query.Route )
                sb.WriteString( "-" )
                sb.WriteString( d )
                sb.WriteString( "\n " )

                for {
                    sb.WriteString( (*b.Name)[ result.Lang ] )
                    b = b.NextStop()
                    if b == nil {
                        break
                    }

                    sb.WriteString( " > " )
                }
                sb.WriteString( "\n" )
            }
        } else {
            sb.WriteString( "Unreachable condition occured!?" )
        }
    } else {
        for busStop, buses := range *result.Schedules {
            writeShortRoute( &result.Lang, &sb, &busStop )
            for _, bus := range buses.Buses {
                sb.WriteString( "  * " )
                if bus.ETAText == "" {
                    sb.WriteString( bus.ETDText )
                } else {
                    sb.WriteString( bus.ETAText )
                }
                sb.WriteString( "\n" )
            }
            sb.WriteString( "\n" )
        }
    }

    return sb.String()
}