import type { AbilityContext } from 'db://assets/mx/module/battle/combat/AbilityContext';
import type { BattleServices } from 'db://assets/mx/module/battle/combat/BattleServices';
import type { EntityId, World } from 'db://assets/mx/module/ecs';
import type { ProjectBattleHandle } from '../runtime/BattleRuntime';
import { BATTLE_MONSTER_CCCLASS, type IBattleMonsterView } from '../view/IBattleMonsterView';
import {
    AttrId,
    AttributeComp,
    CombatComp,
    HealthComp,
    MovementComp,
    TeamComp,
} from 'db://assets/mx/module/battle/ecs/Components';
import { VAR_LAST_DAMAGE_AMOUNT } from 'db://assets/mx/module/battle/combat/DamagePipeline';
import { EffectRegistry } from 'db://assets/mx/module/battle/registry/EffectRegistry';
import { BattleMapSpec } from '../map/BattleMapSpec';
import { applySkillTableKnockback } from './AtkHookEffects';
import { applySkillAtkBuffBoardEffect } from './SkillAtkBuffBoardBridge';
import { getMonsterStatusText, STATUS_TEXT_HP_CAP } from '../view/MonsterStatusText';
import { getAllySkillExtraHost } from '../presentation/AllySkillExtraHost';

const SKILL_ATK_BUFF_FLAG = '__mx_battle_skillAtkBuffRegistered__';
const MOD_SPEED = 'skill_atk_buff_speed';
const MOD_ASPD = 'skill_atk_buff_aspd';
const MOD_RANGE = 'skill_atk_buff_range';

/** 单条 Skill.atk_buff 执行上下文 */
export interface SkillAtkBuffHitOpts {
    /** 本次命中实际伤害（击退等判定） */
    lastDamage?: number;
}

/** 注册 Skill 表 atk_buff 效果 */
export function registerSkillAtkBuffEffects(): void {
    const g = globalThis as unknown as Record<string, boolean | undefined>;
    if (g[SKILL_ATK_BUFF_FLAG]) return;
    g[SKILL_ATK_BUFF_FLAG] = true;

    EffectRegistry.register('ApplySkillAtkBuff', (services, ctx, params) => {
        const buff1 = String(params.buff1 ?? '');
        const buff2 = String(params.buff2 ?? '');
        const opts: SkillAtkBuffHitOpts = { lastDamage: Number(params.lastDamage) || 0 };
        const targets = ctx.targets;
        for (let i = 0; i < targets.length; i++) {
            SkillAtkBuffExecutor.applyPair(services, ctx, targets[i], buff1, buff2, opts);
        }
    });
}

/** Skill.atk_buff1/2 执行器（配表语义见 AutoTable ITableSkill） */
export class SkillAtkBuffExecutor {
    /** 命中后依次执行 buff1、buff2 */
    static applyPair(
        services: BattleServices,
        ctx: AbilityContext,
        target: EntityId,
        buff1: string,
        buff2: string,
        opts?: SkillAtkBuffHitOpts,
    ): void {
        if (!services.world.isAlive(target)) return;
        this.applyRaw(services, ctx, target, buff1, opts);
        this.applyRaw(services, ctx, target, buff2, opts);
    }

    /** 召唤出生：仅移速/血量（type 3/4） */
    static applyOnSpawn(services: BattleServices, entity: EntityId, raw: string): void {
        const parts = this._parse(raw);
        if (!parts.length) return;
        const kind = parts[0];
        if (kind === 3 || kind === 4) {
            this.applyRaw(services, null, entity, raw, {});
            return;
        }
        if (kind > 0) {
            console.log('[SkillAtkBuff] 召唤出生仅支持 type 3/4');
        }
    }

    /**
     * 武器被动 atk_buff type 11 的射程像素（≤16 按格）。
     * 计入 deriveTowerSetupStats，部署时不再走 modifier，避免 getAttr 加两次。
     */
    static loadoutRangeAddPx(buff1: string, buff2: string): number {
        return this._rangeAddFromRaw(buff1) + this._rangeAddFromRaw(buff2);
    }

    /** 清掉 skill_atk_buff_range，避免刷新时残留旧的 +1 格 */
    static clearRangeModifiers(services: BattleServices, entity: EntityId): void {
        services.attributes.removeModifiersByGroup(entity, MOD_RANGE);
    }

    /** 部署时静态 buff；type 11 已计入 setup.range，此处跳过 */
    static applyLoadoutBuffs(services: BattleServices, entity: EntityId, buff1: string, buff2: string): void {
        this._applyLoadoutRaw(services, entity, buff1);
        this._applyLoadoutRaw(services, entity, buff2);
    }

    private static _applyLoadoutRaw(services: BattleServices, entity: EntityId, raw: string): void {
        const parts = this._parse(raw);
        if (!parts.length) return;
        if (parts[0] === 11) return;
        this._applyKind(services, null, entity, parts, {});
    }

    private static _rangeAddFromRaw(raw: string): number {
        const parts = this._parse(raw);
        if (parts[0] !== 11) return 0;
        const addVal = Math.floor(parts[1] || 0);
        if (addVal === 0) return 0;
        return Math.abs(addVal) <= 16 ? addVal * BattleMapSpec.CELL_SIZE : addVal;
    }

    private static applyRaw(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        raw: string,
        opts?: SkillAtkBuffHitOpts,
    ): void {
        const parts = this._parse(raw);
        if (!parts.length) return;
        const kind = parts[0] || 0;
        if (!this._roll(services, ctx, this._chanceWanForKind(kind, parts))) return;
        this._applyKind(services, ctx, target, parts, opts ?? {});
    }

    /** 无概率字段的类型恒为 100% */
    private static _chanceWanForKind(kind: number, parts: number[]): number {
        if (kind === 5 || kind === 9 || kind === 10 || kind === 11) return 10000;
        return parts[1] ?? 10000;
    }

    private static _parse(raw: string): number[] {
        const s = String(raw ?? '').trim();
        if (!s) return [];
        return s.split(',').map((x) => Number(String(x).trim()));
    }

    private static _roll(services: BattleServices, ctx: AbilityContext | null, chanceWan: number): boolean {
        const wan = Math.max(0, Number(chanceWan) || 0);
        if (wan >= 10000) return true;
        const rng = ctx?.rng ?? services.rng;
        return rng.next() * 10000 < wan;
    }

    private static _applyKind(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        parts: number[],
        opts: SkillAtkBuffHitOpts,
    ): void {
        const kind = parts[0] || 0;
        switch (kind) {
            case 1:
                this._stun(services, ctx, target, parts);
                break;
            case 2:
                this._knockback(services, ctx, target, parts, opts);
                break;
            case 3:
                this._moveSpeed(services, target, parts[2] ?? 0, parts[3] ?? 0);
                break;
            case 4:
                this._maxHp(services, target, parts[2] ?? 0);
                break;
            case 5:
                this._peaches(services, ctx, parts[1] ?? 0);
                break;
            case 6:
                this._attackSpeed(services, target, parts[2] ?? 0, parts[3] ?? 0);
                break;
            case 7:
                this._lowerLevel(services, ctx, target, parts[2] ?? 1, parts[3] ?? 0);
                break;
            case 8:
                this._confusion(services, ctx, target, parts[2] ?? 0);
                break;
            case 9:
                this._blockTile(services, ctx);
                break;
            case 10:
                this._heal(services, ctx, target, parts[1] ?? 0);
                break;
            case 11:
                this._attackRange(services, target, parts[1] ?? 0, parts[2] ?? -1);
                break;
            default:
                console.log('[SkillAtkBuff] 未支持的类型', kind, parts.join(','));
                break;
        }
    }

    private static _stun(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        parts: number[],
    ): void {
        const duration = Math.max(0, Number(parts[2]) || 0);
        if (!(duration > 0)) return;
        if (!services.config.getBuff('debuff_4')) return;
        const caster = ctx?.caster ?? target;
        services.buffs.add(target, 'debuff_4', caster, 1, { duration });
    }

    private static _knockback(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        parts: number[],
        opts: SkillAtkBuffHitOpts,
    ): void {
        if (!ctx) return;
        const pixels = Math.max(0, Number(parts[2]) || 0);
        if (!(pixels > 0)) return;
        const lastDamage = opts.lastDamage ?? ctx.vars.get(VAR_LAST_DAMAGE_AMOUNT) ?? 0;
        if (!(lastDamage > 0)) return;
        applySkillTableKnockback(services, ctx, target, pixels);
    }

    private static _moveSpeed(services: BattleServices, target: EntityId, bonusWan: number, durationSec: number): void {
        if (bonusWan === 0) return;
        this._ensureAttr(target, services);
        const mul = 1 + bonusWan / 10000;
        services.attributes.addModifier(target, {
            attr: 'move_speed_mul',
            op: 'Mul',
            value: mul,
            source: MOD_SPEED,
            group: MOD_SPEED,
            remain: durationSec > 0 ? durationSec : undefined,
        });
        const move = services.world.getComponent(target, MovementComp);
        if (move) {
            const base = move.baseSpeed > 0 ? move.baseSpeed : move.speed;
            move.speed = Math.max(0, base * mul);
        }
        getMonsterStatusText().play(target, bonusWan > 0 ? '加速' : '减速');
        if (bonusWan > 0 && durationSec > 0) {
            getAllySkillExtraHost().playSpeedFx(target, durationSec);
        }
    }

    /**
     * 配表血量上限：maxHp ×(1+万分比/10000)，当前血量按原比例同步。
     * 允许时播 `血量上限` 并飘「血上限」，不播 `怪物加血`；出生加成可关。
     * @param world 实体世界
     * @param target 目标
     * @param coeffWan 上限系数万分比（2000=+20%）
     * @param battle 战斗句柄（用于刷新血条/特效）
     * @param playHeal 是否播血上限表现
     */
    static applyMaxHpCoeff(world: World, target: EntityId, coeffWan: number, battle?: ProjectBattleHandle | null, playHeal = true): void {
        if (coeffWan === 0) return;
        const health = world.getComponent(target, HealthComp);
        if (!health || !(health.maxHp > 0)) return;
        const oldHp = health.hp;
        const oldMax = health.maxHp;
        const newMax = Math.max(1, Math.floor(oldMax * (1 + coeffWan / 10000)));
        const ratio = oldHp / oldMax;
        const newHp = Math.max(1, Math.min(newMax, Math.floor(newMax * ratio)));
        health.maxHp = newMax;
        health.hp = newHp;
        this._presentHp(target, newHp, newMax, battle, playHeal, STATUS_TEXT_HP_CAP);
    }

    /**
     * 刷新血条；加血播 `怪物加血`，血上限播 `血量上限`（不叠加加血）。
     * @param entity 目标
     * @param newHp 变更后当前血量
     * @param newMax 变更后上限
     * @param battle 战斗句柄；缺省用 CurentBattle
     * @param playFx 是否播特效
     * @param statusText 飘字文案；缺省「加血」
     */
    private static _presentHp(entity: EntityId, newHp: number, newMax: number, battle?: ProjectBattleHandle | null, playFx = true, statusText = '加血'): void {
        const handle = battle ?? (gg.game.CurentBattle as ProjectBattleHandle | null | undefined);
        const node = handle?.getMonsterPresenter?.()?.getEntityNodeMap().get(entity);
        if (!node?.isValid) return;
        const view = node.getComponent(BATTLE_MONSTER_CCCLASS) as IBattleMonsterView | null;
        view?.syncMxHp?.(newHp, newMax);
        if (!playFx) return;
        if (statusText === STATUS_TEXT_HP_CAP) {
            if (!view?.playHpCapEffect) {
                console.warn('[SkillAtkBuff] 缺 playHpCapEffect');
                return;
            }
            view.playHpCapEffect();
            return;
        }
        view?.playHealEffect?.(statusText);
    }

    private static _maxHp(services: BattleServices, target: EntityId, coeffWan: number): void {
        this.applyMaxHpCoeff(services.world, target, coeffWan);
    }

    private static _peaches(services: BattleServices, ctx: AbilityContext | null, count: number): void {
        const n = Math.max(0, Math.floor(Number(count) || 0));
        if (!(n > 0)) return;
        const ownerId = ctx ? this._ownerId(services, ctx.caster) : 0;
        applySkillAtkBuffBoardEffect(services, {
            kind: 5,
            ownerPlayerId: ownerId,
            peachCount: n,
            target: ctx?.caster,
        });
    }

    /**
     * 攻速万分比走 aspd_add（与攻速符/被动同一通道）；负值降攻速。
     * 普攻间隔读 getFinalAttackSpeed，写 AttrId.AttackSpeed Mul 不会生效。
     * @param services 战斗服务
     * @param target 目标塔
     * @param bonusWan 攻速加成万分比（-5000=×0.5）
     * @param durationSec 持续秒；≤0 永久
     */
    private static _attackSpeed(services: BattleServices, target: EntityId, bonusWan: number, durationSec: number): void {
        if (bonusWan === 0) return;
        this._ensureAttr(target, services);
        services.attributes.addModifier(target, {
            attr: 'aspd_add',
            op: 'Add',
            value: bonusWan,
            source: MOD_ASPD,
            group: MOD_ASPD,
            remain: durationSec > 0 ? durationSec : undefined,
        });
    }

    private static _lowerLevel(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        delta: number,
        durationSec: number,
    ): void {
        const d = Math.max(1, Math.floor(Number(delta) || 1));
        const ownerId = ctx ? this._ownerId(services, ctx.caster) : 0;
        applySkillAtkBuffBoardEffect(services, {
            kind: 7,
            ownerPlayerId: ownerId,
            target,
            levelDelta: -d,
            durationSec,
        });
    }

    private static _confusion(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        durationSec: number,
    ): void {
        const duration = Math.max(0.05, Number(durationSec) || 0);
        if (!services.config.getBuff('debuff_8')) return;
        const caster = ctx?.caster ?? target;
        services.buffs.add(target, 'debuff_8', caster, 1, { duration });
    }

    private static _blockTile(services: BattleServices, ctx: AbilityContext | null): void {
        const ownerId = ctx ? this._ownerId(services, ctx.caster) : 0;
        applySkillAtkBuffBoardEffect(services, { kind: 9, ownerPlayerId: ownerId });
    }

    private static _heal(
        services: BattleServices,
        ctx: AbilityContext | null,
        target: EntityId,
        healWan: number,
    ): void {
        const wan = Math.max(0, Number(healWan) || 0);
        if (!(wan > 0)) return;
        const health = services.world.getComponent(target, HealthComp);
        if (!health || !(health.maxHp > 0)) return;
        const add = Math.max(1, Math.floor(health.maxHp * wan / 10000));
        health.hp = Math.min(health.maxHp, health.hp + add);
        this._presentHp(target, health.hp, health.maxHp);
    }

    /**
     * 攻击距离：只走 modifier。禁止再改 CombatComp.range，否则 sync 进 base 后 getAttr 会加两次。
     * @param services 战斗服务
     * @param target 受益实体
     * @param addRaw ≤16 按格，否则按像素
     * @param durationSec -1 本场永久
     */
    private static _attackRange(services: BattleServices, target: EntityId, addRaw: number, durationSec: number): void {
        const addVal = Math.floor(Number(addRaw) || 0);
        if (addVal === 0) return;
        const addPx = Math.abs(addVal) <= 16 ? addVal * BattleMapSpec.CELL_SIZE : addVal;
        this._ensureAttr(target, services);
        services.attributes.addModifier(target, {
            attr: AttrId.Range,
            op: 'Add',
            value: addPx,
            source: MOD_RANGE,
            group: MOD_RANGE,
            remain: durationSec < 0 ? undefined : (durationSec > 0 ? durationSec : undefined),
        });
    }

    private static _ensureAttr(target: EntityId, services: BattleServices): void {
        if (!services.world.getComponent(target, AttributeComp)) {
            services.world.addComponent(target, new AttributeComp());
        }
    }

    private static _ownerId(services: BattleServices, entity: EntityId): number {
        const team = services.world.getComponent(entity, TeamComp);
        return team?.ownerId ?? team?.team ?? 0;
    }
}