import { GEvent } from 'db://assets/mx/module/event/GEvent';
import { createMembershipSet, membershipAdd, membershipFromArray, membershipDedupeArray, type MembershipSet, type ReadonlyMembershipSet } from '../../../../mx/tools/MembershipSet';
import MTools from 'db://assets/mx/tools/MTools';
import { ChapterNewPlayTypeEnum, IParatroopsProperty } from '../../../game/ChapterPlayTypes';
import { BossWarnType } from '../../../ui/BattleGame/BossWarnSpine';
import { cloneParatroopsConfig } from '../MechanismConfigClone';
import type { IBattleMechanism, MechanismContext } from '../IBattleMechanism';
import { calcMiddleRowRange } from '../MechanismSpawnArea';
import { isCombatPhase, spawnParatroopAtGrid } from '../MechanismServices';
import type { MapGrid } from '../../map/legacy/MapGrid';

/**
 * 飞禽空投（Playmode 14 / 19）
 *
 * 配表语义（Playmode.par1）：
 * - `monsterId,numMin,numMax` 可重复多组
 * - 每次空投：每组各自随机数量并全部生成（不是只随机一种怪）
 */
export class ParatroopsMechanism implements IBattleMechanism {
    readonly typeId: ChapterNewPlayTypeEnum;

    private _ctx: MechanismContext | null = null;
    private _config: IParatroopsProperty | null = null;
    private _eventIndex = 0;
    private _checkTimer = 0;

    constructor(typeId: ChapterNewPlayTypeEnum = ChapterNewPlayTypeEnum.Paratroops) {
        this.typeId = typeId;
    }

    init(ctx: MechanismContext, config: unknown): void {
        this._ctx = ctx;
        this._config = cloneParatroopsConfig(config as IParatroopsProperty);
        this._eventIndex = 0;
        this._checkTimer = 0;
        const cfg = this._config;
    }

    tick(dt: number): void {
        if (!this._ctx || !this._config || !isCombatPhase(this._ctx)) return;
        this._checkTimer += dt;
        if (this._checkTimer < 1) return;
        this._checkTimer = 0;
        this._tryLaunch();
    }

    destroy(): void {
        this._ctx = null;
        this._config = null;
    }

    private _tryLaunch(): void {
        const ctx = this._ctx;
        const cfg = this._config;
        if (!ctx || !cfg) return;

        while (this._eventIndex < cfg.timeArr.length && ctx.battleTime >= cfg.timeArr[this._eventIndex]) {
            if (!this._launchOnce(this._eventIndex)) {
                // 落点暂不可用：保留 eventIndex，下一秒重试
                break;
            }
            this._eventIndex++;
        }
    }

    private _launchOnce(eventIndex: number): boolean {
        const ctx = this._ctx;
        const cfg = this._config;
        if (!ctx || !cfg) return false;

        const options = cfg.monsterOptions ?? [];
        if (options.length === 0) {
            console.error('[ParatroopsMechanism] monsterOptions 为空，跳过 event=', eventIndex);
            return true;
        }

        const map = ctx.runtime.Map;
        if (!map) return false;

        // 每组怪物各自 roll 数量（策划：两个 id + 两个数量区间都要生效）
        const batches: { monsterId: number; count: number }[] = [];
        let total = 0;
        for (const opt of options) {
            const id = Number(opt.monsterId) || 0;
            if (id <= 0) continue;
            const lo = Math.max(0, Number(opt.numMin) || 0);
            const hi = Math.max(lo, Number(opt.numMax) || lo);
            const count = MTools.getRandomValue(lo, hi);
            if (count <= 0) continue;
            batches.push({ monsterId: id, count });
            total += count;
        }
        if (total <= 0) {
            console.log('[ParatroopsMechanism] 本波 roll 数量为 0，跳过 event=', eventIndex);
            return true;
        }

        const rowRange = calcMiddleRowRange(map.mapRows);
        // 飞禽空投：仍用全图随机可行走落点，不参与「怪物最多区域」规则
        let grids = map.getParatroopLandingGrids(total, ctx.session, rowRange);
        if (grids.length < total) {
            const used = membershipFromArray(grids.map(g => `${g.Row},${g.Col}`));
            const extra = map.getParatroopLandingGrids(total - grids.length, ctx.session);
            for (const g of extra) {
                const key = `${g.Row},${g.Col}`;
                if (used.has(key)) continue;
                membershipAdd(used, key);
                grids.push(g);
                if (grids.length >= total) break;
            }
        }
        if (grids.length === 0) {
            console.log(
                '[ParatroopsMechanism] 无落点 event=',
                eventIndex,
                'battleTime=',
                ctx.battleTime,
            );
            return false;
        }

        GEvent.Ins.emit(BossWarnType.Paratroops);

        let spawned = 0;
        let gridCursor = 0;
        const pickGrid = (): MapGrid => {
            if (gridCursor < grids.length) return grids[gridCursor++];
            return grids[Math.floor(Math.random() * grids.length)];
        };

        for (const batch of batches) {
            for (let i = 0; i < batch.count; i++) {
                if (spawnParatroopAtGrid(ctx, pickGrid(), batch.monsterId) != null) {
                    spawned++;
                }
            }
        }

        if (spawned <= 0) {
            console.log('[ParatroopsMechanism] 全部生成失败 event=', eventIndex);
            return false;
        }
        return true;
    }
}