import { BattleBuffFunctionType, BattleBuffSlotType } from '../../manager/battleBuff/BattleBuffTypes';
import {
    BattleGameSkillDragKind,
    isBattleBuffDragRecycleToPeach,
    resolveBattleGameSkillClickKind,
    resolveBattleGameSkillDragKind,
} from '../../manager/battleBuff/BattleBuffActiveSkillUtil';
import { parseBattleBuffRow } from '../../manager/BattleBuffParse';
import { DailyShopDataManager } from '../../manager/DailyShopDataManager';
import { DailyShopKind, type DailyShopParsed } from '../../manager/DailyShopTypes';
import { TableNames } from '../../game/ConfigTableData';
import type { ProjectBattleHandle } from '../../battle/runtime/BattleRuntime';

/** 主动 skill 槽数量 */
const SKILL_SLOT_COUNT = 2;

/** 七十二变不可随机到的主动 buff id*/
const RANDOM_ACTIVE_BANNED_BUFF_IDS: readonly number[] = [];

/** 战斗 rng 最小接口（七十二变 roll） */
type BattleRollRng = { int(min: number, max: number): number };

/** 随机池条目：buff id + 权重 */
type RollPoolEntry = { id: number; weight: number };

/** 单槽七十二变状态 */
type RandomActiveSlotState = {
    /** 携带的七十二变 buff id */
    baseBuffId: number;
    /** 当前随机展示 buff id；0=显示本体（CD 中） */
    rolledBuffId: number;
};

/**
 * 七十二变（functiontype=19）局内宿主。
 * CD 结束随机主动 buff；用完恢复本体并重新进入 CD。
 */
export class BattleGameRandomActiveSkillHost {
    private static _inst: BattleGameRandomActiveSkillHost | null = null;

    private _slots: (RandomActiveSlotState | null)[] = [];

    /** 单例 */
    static get(): BattleGameRandomActiveSkillHost {
        if (!BattleGameRandomActiveSkillHost._inst) {
            BattleGameRandomActiveSkillHost._inst = new BattleGameRandomActiveSkillHost();
        }
        return BattleGameRandomActiveSkillHost._inst;
    }

    /** 战斗结束重置 */
    reset(): void {
        this._slots.length = 0;
    }

    /** 是否七十二变 buff 行 */
    isRandomActiveRow(row: ITableBattlebuff | null | undefined): boolean {
        if (!row) return false;
        return Number(row.type) === BattleBuffSlotType.Active
            && Number(row.functiontype) === BattleBuffFunctionType.RandomActive;
    }

    /** 槽位是否为七十二变携带 */
    isRandomActiveSlot(slotIndex: number): boolean {
        return this._slots[slotIndex] != null;
    }

    /** 当前是否展示随机出的主动 buff（可施放） */
    isShowingRolledBuff(slotIndex: number): boolean {
        const state = this._slots[slotIndex];
        return state != null && state.rolledBuffId > 0;
    }

    /** 绑定槽位携带 buff（refresh 时） */
    syncSlot(slotIndex: number, baseBuffId: number, row: ITableBattlebuff | null | undefined): void {
        if (slotIndex < 0 || slotIndex >= SKILL_SLOT_COUNT) return;
        if (!this.isRandomActiveRow(row)) {
            this._slots[slotIndex] = null;
            return;
        }
        const id = Math.floor(Number(baseBuffId) || 0);
        if (id <= 0) {
            this._slots[slotIndex] = null;
            return;
        }
        const prev = this._slots[slotIndex];
        const rolledBuffId = prev != null && prev.baseBuffId === id ? prev.rolledBuffId : 0;
        this._slots[slotIndex] = { baseBuffId: id, rolledBuffId };
    }

    /** 解析槽位当前应走的 skill 拖拽类型（roll 后按变化 buff） */
    resolveCastDragKind(slotIndex: number, baseParsed: DailyShopParsed | null): BattleGameSkillDragKind | null {
        const cast = this.resolveDisplayParsed(slotIndex, baseParsed);
        if (!cast) return null;
        return resolveBattleGameSkillDragKind(cast.row as ITableBattlebuff);
    }

    /**
     * 解析槽位当前应展示的 buff 解析结果。
     * @param slotIndex skill 槽
     * @param baseParsed 携带 buff 解析
     */
    resolveDisplayParsed(slotIndex: number, baseParsed: DailyShopParsed | null): DailyShopParsed | null {
        if (!baseParsed) return null;
        const state = this._slots[slotIndex];
        if (!state) return baseParsed;
        if (state.rolledBuffId > 0) {
            const rolled = DailyShopDataManager.getParsed(state.rolledBuffId)
                ?? BattleGameRandomActiveSkillHost._parseRollBuffParsed(state.rolledBuffId);
            if (!rolled) {
                console.log('[BattleGameRandomActive] 随机 buff 缺失', state.rolledBuffId);
                return baseParsed;
            }
            return rolled;
        }
        return baseParsed;
    }

    /**
     * CD 结束：随机一个可局内施放的主动 buff。
     * @returns 是否成功 roll
     */
    tryRollOnCooldownReady(slotIndex: number, battle: ProjectBattleHandle | null): boolean {
        const state = this._slots[slotIndex];
        if (!state || state.rolledBuffId > 0) return false;

        const excludeIds = BattleGameRandomActiveSkillHost._collectCarriedActiveBuffIds();
        const picked = BattleGameRandomActiveSkillHost.pickRollBuffIdFromPool(
            excludeIds,
            battle?.session?.rng ?? null,
        );
        if (picked <= 0) {
            console.log('[BattleGameRandomActive] roll 失败', slotIndex, excludeIds);
            return false;
        }
        state.rolledBuffId = picked;
        return true;
    }

    /**
     * 从可随机池按 weight 权重选取 buff id；GM 固定 id 优先且须在池内。
     * @param excludeIds 排除 id
     * @param rng 战斗 rng；GM 固定时可省略
     */
    static pickRollBuffIdFromPool(excludeIds: readonly number[], rng: BattleRollRng | null): number {
        const pool = BattleGameRandomActiveSkillHost._buildRollPool(excludeIds);
        const fixId = Math.floor(Number(gg.game.gmRandomActiveFixBuffId) || 0);
        if (fixId > 0) {
            for (let i = 0; i < pool.length; i++) {
                if (pool[i].id === fixId) return fixId;
            }
            console.log('[BattleGameRandomActive] GM 固定 roll 不在可用池', fixId, pool);
            return 0;
        }
        if (pool.length <= 0) return 0;
        if (!rng) {
            console.log('[BattleGameRandomActive] 无 battle rng');
            return 0;
        }
        let total = 0;
        for (let i = 0; i < pool.length; i++) total += pool[i].weight;
        if (total <= 0) return 0;
        let roll = rng.int(0, total - 1);
        for (let i = 0; i < pool.length; i++) {
            roll -= pool[i].weight;
            if (roll < 0) return pool[i].id;
        }
        return pool[pool.length - 1].id;
    }

    /** 随机 buff 施放成功：恢复本体展示（由 View 开 CD） */
    onRolledBuffConsumed(slotIndex: number): void {
        const state = this._slots[slotIndex];
        if (!state) return;
        state.rolledBuffId = 0;
    }

    /** 收集全部主动槽携带 buff id（不可随机到自身或其它槽） */
    private static _collectCarriedActiveBuffIds(): number[] {
        const slotIds = DailyShopDataManager.getActiveSlotIds();
        const out: number[] = [];
        for (let i = 0; i < SKILL_SLOT_COUNT; i++) {
            const id = Math.floor(Number(slotIds[i]) || 0);
            if (id > 0) out.push(id);
        }
        return out;
    }

    /** 可随机主动 buff 池（type=1、局内可施放、weight>0；排除已携带 id） */
    private static _buildRollPool(excludeIds: readonly number[]): RollPoolEntry[] {
        const list = gg.data.table.getTableList<ITableBattlebuff>(TableNames.Battlebuff) ?? [];
        const exclude = excludeIds.slice();
        const out: RollPoolEntry[] = [];
        for (let i = 0; i < list.length; i++) {
            const row = list[i];
            const id = Math.floor(Number(row.id) || 0);
            if (id <= 0) continue;
            if (exclude.indexOf(id) >= 0) continue;
            if (RANDOM_ACTIVE_BANNED_BUFF_IDS.indexOf(id) >= 0) continue;
            if (!BattleGameRandomActiveSkillHost._isRollCandidate(row)) continue;
            const weight = Math.max(0, Math.floor(Number(row.weight) || 0));
            if (weight <= 0) continue;
            out.push({ id, weight });
        }
        return out;
    }

    /** 从配表解析 roll 目标 buff（不依赖是否已携带） */
    private static _parseRollBuffParsed(buffId: number): DailyShopParsed | null {
        const id = Math.floor(Number(buffId) || 0);
        if (id <= 0) return null;
        const row = gg.data.table.getTableData<ITableBattlebuff>(TableNames.Battlebuff, id);
        if (!row) return null;
        return parseBattleBuffRow(row);
    }

    /** 是否可进入随机池 */
    private static _isRollCandidate(row: ITableBattlebuff): boolean {
        const parsed = parseBattleBuffRow(row);
        if (!parsed || parsed.kind !== DailyShopKind.Active) return false;
        if (Number(row.functiontype) === BattleBuffFunctionType.RandomActive) return false;
        if (resolveBattleGameSkillDragKind(row) != null) return true;
        if (resolveBattleGameSkillClickKind(row) != null) return true;
        return isBattleBuffDragRecycleToPeach(row);
    }
}

/** 获取七十二变宿主 */
export function getBattleGameRandomActiveSkillHost(): BattleGameRandomActiveSkillHost {
    return BattleGameRandomActiveSkillHost.get();
}