export class CollisionRegistry {

    constructor() {
        this.entries = []
    }

    purge(agentId) {
        this.entries = this.entries.filter(
            e => e.agentA !== agentId && e.agentB !== agentId
        )
    }

    add(entry) {
        const duplicate = this.entries.find(
            e =>
                (e.agentA === entry.agentA && e.agentB === entry.agentB) ||
                (e.agentA === entry.agentB && e.agentB === entry.agentA)
        )
        if(duplicate) {
            if(entry.time < duplicate.time) Object.assign(duplicate, entry)
            return
        }
        this.entries.push(entry)
    }

    dueBefore(t) {
        return(this.entries.filter(e => e.time <= t))
    }

    remove(entry) {
        this.entries = this.entries.filter(
            e =>
                !((e.agentA === entry.agentA && e.agentB === entry.agentB) ||
                  (e.agentA === entry.agentB && e.agentB === entry.agentA))
        )
    }

}