OpenFrontIO/src/core/execution/BotSpawner.ts

import { consolex } from "../Consolex";
import { Cell, Game, PlayerType } from "../game/Game";
import { TileRef } from "../game/GameMap";
import { PseudoRandom } from "../PseudoRandom";
import { GameID, SpawnIntent } from "../Schemas";
import { simpleHash } from "../Util";
import { BOT_NAME_PREFIXES, BOT_NAME_SUFFIXES } from "./utils/BotNames";


export class BotSpawner {
    private random: PseudoRandom
    private bots: SpawnIntent[] = [];

    constructor(private gs: Game, gameID: GameID) {
        this.random = new PseudoRandom(simpleHash(gameID))
    }

    spawnBots(numBots: number): SpawnIntent[] {
        let tries = 0
        while (this.bots.length < numBots) {
            if (tries > 10000) {
                consolex.log('too many retries while spawning bots, giving up')
                return this.bots
            }
            const botName = this.randomBotName();
            const spawn = this.spawnBot(botName);
            if (spawn != null) {
                this.bots.push(spawn);
            } else {
                tries++
            }
        }
        return this.bots;
    }

    spawnBot(botName: string): SpawnIntent | null {
        const tile = this.randTile()
        if (!this.gs.isLand(tile)) {
            return null
        }
        for (const spawn of this.bots) {
            if (this.gs.manhattanDist(this.gs.ref(spawn.x, spawn.y), tile) < 30) {
                return null
            }
        }
        return {
            type: 'spawn',
            playerID: this.random.nextID(),
            name: botName,
            playerType: PlayerType.Bot,
            x: this.gs.x(tile),
            y: this.gs.y(tile)
        };
    }

    private randomBotName(): string {
        const prefixIndex = this.random.nextInt(0, BOT_NAME_PREFIXES.length);
        const suffixIndex = this.random.nextInt(0, BOT_NAME_SUFFIXES.length);
        return `${BOT_NAME_PREFIXES[prefixIndex]} ${BOT_NAME_SUFFIXES[suffixIndex]}`;
    }

    private randTile(): TileRef {
        return this.gs.ref(
            this.random.nextInt(0, this.gs.width()),
            this.random.nextInt(0, this.gs.height())
        )
    }
}