import {
    _decorator, Button, Canvas, Component, instantiate, Label, Node, Rect, Sprite, Tween, tween, UIOpacity, UITransform, Vec3, view, Widget,
} from 'cc';
import { SpriteLoad } from 'db://assets/mx/components/SpriteLoad';
import { GBundle } from '../../game/ConfigRes';
import { BATTLE_HERO_WEAPON_PATH } from '../../battle/res/BattleHeroResCollector';
import type { ProjectBattleHandle } from '../../battle/runtime/BattleRuntime';
import type { EntityId } from 'db://assets/mx/module/ecs';
import type { WeaponDropRecord } from '../../battle/combat/WeaponDropService';
import { BattleAudio } from '../../battle/audio/BattleAudio';

const { ccclass } = _decorator;

/** 战场掉落图标子节点名 */
const ICON_NODE = '图标';
/** 结算模板图标子节点名 */
const SETTLE_ICON_NODE = 'name';
/** 碎片数量底节点名 */
const NUM_BG_NODE = 'numBg';
/** 碎片数量文本节点名 */
const NUM_LABEL_NODE = 'lb_weaponNum';
/** 暂停列表敌方角标节点名（预制体已挂贴图，仅控制显隐） */
const ENEMY_MARK_NODE = '敌方';
/** 图标显示尺寸（与预制体一致） */
const ICON_W = 68;
const ICON_H = 35;
/** 掉落根节点默认尺寸（与「武器」预制体 UITransform 一致） */
const DROP_W = 88;
const DROP_H = 48;
/** 重力（像素/秒²） */
const GRAVITY = -3200;
/** 落地弹性 */
const BOUNCE = 0.42;
/** 落地水平摩擦 */
const GROUND_FRICTION = 0.55;
/** 视为静止的速度 */
const SETTLE_SPEED = 90;
/** 屏幕内边距（像素），避免贴边被裁 */
const SCREEN_PAD = 8;
/** 飞向暂停按钮时长 */
const FLY_SEC = 0.55;
/** 到达后渐隐时长 */
const FADE_SEC = 0.18;

/** 掉落阶段 */
enum DropPhase {
    /** 空闲 / 暂停列表展示 */
    Idle = 0,
    /** 物理掉落中 */
    Drop = 1,
    /** 等待玩家点击拾取 */
    WaitClick = 2,
    /** 飞向暂停按钮 */
    Fly = 3,
}

/**
 * 「武器」预制体掉落视图：物理落地、点击拾取、飞入暂停按钮。
 */
@ccclass('WeaponDropView')
export class WeaponDropView extends Component {
    private _phase = DropPhase.Idle;
    private _battle: ProjectBattleHandle | null = null;
    private _pauseBtn: Node | null = null;
    private _needClick = false;
    private _vx = 0;
    private _vy = 0;
    private _groundY = 0;
    private _minX = 0;
    private _maxX = 0;
    private _minY = 0;
    private _maxY = 0;
    private _hasBounds = false;
    private readonly _pos = new Vec3();
    private readonly _onTouchEnd = this._handleClick.bind(this);
    private readonly _onFlyDone = this._finishFly.bind(this);
    private readonly _onFadeDone = this._recycle.bind(this);

    /**
     * 克隆结算页 ui_weaponTemp 模板。
     * @param template BattleSuccess / BattleFail 下 ui_weaponTemp
     */
    static takeSettlePrefab(template: Node | null | undefined): Node | null {
        if (!template?.isValid) {
            console.log('[WeaponDrop] ui_weaponTemp 模板无效');
            return null;
        }
        const node = instantiate(template);
        node.active = true;
        return node;
    }

    /** 从节点池取「武器」预制体（战场掉落 / 暂停列表） */
    static takePrefab(): Node | null {
        let node: Node | null = null;
        try {
            node = gg.res.getNode(`${BATTLE_HERO_WEAPON_PATH}/`, '武器', GBundle.BattleHero);
        } catch (e) {
            console.log('[WeaponDrop] 预制体加载异常', String(e));
            return null;
        }
        if (!node?.isValid) {
            console.log('[WeaponDrop] 武器预制体缺失');
            return null;
        }
        return node;
    }

    /**
     * 按武器信息刷新底框与图标（掉落 / 暂停列表共用）。
     * @param node 武器预制体根节点
     * @param record 掉落记录
     */
    static applyVisual(node: Node, record: WeaponDropRecord): void {
        WeaponDropView.clearFragmentCount(node);
        const weapon = gg.equip.getEquip(record.weaponId);
        if (!weapon) {
            console.log('[WeaponDrop] 武器表缺失', record.weaponId);
            return;
        }
        const bgIndex = WeaponDropView._qualityBgIndex(record.quality, record.weaponId);
        WeaponDropView._setSprite(node, `weapon/武器底${bgIndex}`);
        const bgSprite = node.getComponent(Sprite);
        if (bgSprite) bgSprite.type = Sprite.Type.SLICED;
        const iconName = String(weapon.icon ?? '').trim();
        if (!iconName) {
            console.log('[WeaponDrop] icon 缺失', record.weaponId);
        }
        const icon = node.getChildByName(ICON_NODE);
        if (!icon?.isValid) {
            console.log('[WeaponDrop] 缺少图标节点', record.weaponId);
            return;
        }
        WeaponDropView._setSprite(icon, iconName ? `weapon/${iconName}` : '', true);
    }

    /**
     * 结算列表：刷新 ui_weaponTemp 克隆体底框与 name 图标。
     * @param node ui_weaponTemp 克隆根节点
     * @param record 掉落记录
     */
    static applySettleVisual(node: Node, record: WeaponDropRecord): void {
        WeaponDropView.clearFragmentCount(node);
        const weapon = gg.equip.getEquip(record.weaponId);
        if (!weapon) {
            console.log('[WeaponDrop] 武器表缺失', record.weaponId);
            return;
        }
        const bgIndex = WeaponDropView._qualityBgIndex(record.quality, record.weaponId);
        WeaponDropView._setSprite(node, `weapon/武器底${bgIndex}`);
        const bgSprite = node.getComponent(Sprite);
        if (bgSprite) bgSprite.type = Sprite.Type.SLICED;
        const iconName = String(weapon.icon ?? '').trim();
        if (!iconName) {
            console.log('[WeaponDrop] icon 缺失', record.weaponId);
        }
        const icon = node.getChildByName(SETTLE_ICON_NODE);
        if (!icon?.isValid) {
            console.log('[WeaponDrop] 缺少 name 节点', record.weaponId);
            return;
        }
        WeaponDropView._setSprite(icon, iconName ? `weapon/${iconName}` : '', true);
    }

    /** 销毁结算 ui_weaponTemp 克隆体（勿回战场武器池） */
    static recycleSettleNode(node: Node): void {
        if (!node?.isValid) return;
        node.getComponent(WeaponDropView)?.resetMotion();
        node.destroy();
    }

    /**
     * 暂停列表：敌方奖励显示「敌方」角标，我方奖励隐藏。
     * @param node 武器预制体根节点
     * @param isSelf 是否己方击杀掉落
     */
    static applySideMark(node: Node, isSelf: boolean): void {
        if (!node?.isValid) return;
        const mark = node?.find(ENEMY_MARK_NODE);
        if (!mark?.isValid) {
            console.log('[WeaponDrop] 缺少敌方节点');
            return;
        }
        mark.active = !isSelf;
    }

    /** 隐藏敌方角标（战场掉落 / 回池） */
    static clearSideMark(node: Node | null | undefined): void {
        if (!node?.isValid) return;
        const mark = node?.find(ENEMY_MARK_NODE);
        if (mark?.isValid) mark.active = false;
    }

    /**
     * 结算列表：显示武器碎片数量。
     * @param node 武器预制体根节点
     * @param count 碎片数量
     */
    static applyFragmentCount(node: Node, count: number): void {
        const numBg = node.getChildByName(NUM_BG_NODE);
        if (!numBg?.isValid) {
            console.log('[WeaponDrop] 缺少 numBg');
            return;
        }
        const num = Math.max(0, Math.floor(count));
        if (num <= 0) {
            numBg.active = false;
            return;
        }
        numBg.active = true;
        const lb = numBg.getChildByName(NUM_LABEL_NODE)?.getComponent(Label);
        if (!lb) {
            console.log('[WeaponDrop] 缺少 lb_weaponNum');
            return;
        }
        lb.string = `${num}`;
    }

    /** 隐藏碎片数量（战场掉落 / 回池） */
    static clearFragmentCount(node: Node): void {
        const numBg = node.getChildByName(NUM_BG_NODE);
        if (!numBg?.isValid) return;
        numBg.active = false;
        const lb = numBg.getChildByName(NUM_LABEL_NODE)?.getComponent(Label);
        if (lb) lb.string = '';
    }

    /** Weapon.quality 0~4 → 武器底 0~4（白/绿/蓝/紫/橙） */
    private static _qualityBgIndex(quality: number, weaponId: number): number {
        const q = Number(quality) | 0;
        if (q < 0 || q > 4) {
            console.log('[WeaponDrop] 品质无效', weaponId, q);
        }
        return q;
    }

    /**
     * 加载 icons/weapon 图。
     * @param node 目标节点
     * @param path bundle 内路径
     * @param fitIcon 是否把图标压到预制体尺寸
     */
    private static _setSprite(node: Node, path: string, fitIcon = false): void {
        if (!node?.isValid) return;
        if (!path) {
            node.active = false;
            return;
        }
        node.active = true;
        node.getOrAddComponent(SpriteLoad).setSprite(path, GBundle.Items);
    }

    /**
     * 世界掉落：物理落地后，己方等待点击、敌方自动飞入。
     * @param battle 当前战斗
     * @param pauseBtn 暂停按钮
     * @param startWorld 死亡世界坐标
     * @param needClick 是否需要点击拾取
     */
    playWorldDrop(battle: ProjectBattleHandle, pauseBtn: Node | null, startWorld: Readonly<Vec3>, needClick: boolean): void {
        this.resetMotion();
        WeaponDropView.clearSideMark(this.node);
        this._battle = battle;
        this._pauseBtn = pauseBtn;
        this._needClick = needClick;
        const node = this.node;
        this._captureScreenBounds();
        this._pos.set(startWorld.x, startWorld.y, startWorld.z);
        this._clampInScreen(this._pos, false);
        node.setWorldPosition(this._pos);
        node.setScale(1, 1, 1);
        node.angle = 0;
        this._setOpacity(255);
        this._vx = (Math.random() - 0.5) * 280;
        this._vy = 120 + Math.random() * 80;
        this._groundY = this._pos.y - (18 + Math.random() * 28);
        if (this._hasBounds) {
            this._groundY = Math.min(this._maxY, Math.max(this._minY, this._groundY));
        }
        this._phase = DropPhase.Drop;
        this._setClickable(false);
    }

    /** 取战斗面板/画布世界包围盒，按掉落物半尺寸得到可停留范围 */
    private _captureScreenBounds(): void {
        this._hasBounds = false;
        let panelBox: Rect | null = null;
        let canvasBox: Rect | null = null;
        let n: Node | null = this.node.parent;
        while (n?.isValid) {
            const ut = n.getComponent(UITransform);
            const widget = n.getComponent(Widget);
            if (ut && widget && (widget.alignFlags & 45) === 45) {
                const worldBox = ut.getBoundingBoxToWorld();
                if (worldBox.width > 1 && worldBox.height > 1) {
                    panelBox = worldBox;
                }
            }
            if (n.getComponent(Canvas) && ut) {
                const worldBox = ut.getBoundingBoxToWorld();
                if (worldBox.width > 1 && worldBox.height > 1) {
                    canvasBox = worldBox;
                }
                break;
            }
            n = n.parent;
        }
        let box = panelBox ?? canvasBox;
        if (!box) {
            box = this._fallbackScreenBox();
        }
        if (!box) {
            console.log('[WeaponDrop] 无法取得画布范围，掉落可能出屏');
            return;
        }
        const selfUt = this.node.getComponent(UITransform);
        const hw = Math.max(1, (selfUt?.width ?? DROP_W) * 0.5) + SCREEN_PAD;
        const hh = Math.max(1, (selfUt?.height ?? DROP_H) * 0.5) + SCREEN_PAD;
        this._minX = box.x + hw;
        this._maxX = box.x + box.width - hw;
        this._minY = box.y + hh;
        this._maxY = box.y + box.height - hh;
        if (this._minX > this._maxX) {
            const midX = box.x + box.width * 0.5;
            this._minX = midX;
            this._maxX = midX;
        }
        if (this._minY > this._maxY) {
            const midY = box.y + box.height * 0.5;
            this._minY = midY;
            this._maxY = midY;
        }
        this._hasBounds = true;
    }

    /** Canvas / Widget 均不可用时，用可见区域与父节点 UITransform 估算世界包围盒 */
    private _fallbackScreenBox(): Rect | null {
        let anchor: Node | null = this.node.parent;
        while (anchor?.isValid && !anchor.getComponent(UITransform)) {
            anchor = anchor.parent;
        }
        const ut = anchor?.getComponent(UITransform);
        if (!ut) return null;
        const visible = view.getVisibleSize();
        const halfW = visible.width * 0.5;
        const halfH = visible.height * 0.5;
        const center = ut.convertToWorldSpaceAR(new Vec3(0, 0, 0));
        return new Rect(center.x - halfW, center.y - halfH, visible.width, visible.height);
    }

    /**
     * 把掉落中心钳在屏幕内；碰到左右边时反向水平速度。
     * @param pos 世界坐标
     * @param bounce 是否反弹速度
     */
    private _clampInScreen(pos: Vec3, bounce: boolean): void {
        if (!this._hasBounds) return;
        if (pos.x < this._minX) {
            pos.x = this._minX;
            if (bounce) this._vx = Math.abs(this._vx);
        } else if (pos.x > this._maxX) {
            pos.x = this._maxX;
            if (bounce) this._vx = -Math.abs(this._vx);
        }
        if (pos.y < this._minY) {
            pos.y = this._minY;
            if (bounce && this._vy < 0) this._vy = 0;
        } else if (pos.y > this._maxY) {
            pos.y = this._maxY;
            if (bounce && this._vy > 0) this._vy = 0;
        }
    }

    /** 暂停列表：仅展示，关闭交互 */
    playDisplay(): void {
        Tween.stopAllByTarget(this.node);
        const op = this.node.getComponent(UIOpacity);
        if (op) Tween.stopAllByTarget(op);
        this.node.off(Node.EventType.TOUCH_END, this._onTouchEnd, this);
        this._setClickable(false);
        this._phase = DropPhase.Idle;
        this._battle = null;
        this._pauseBtn = null;
        this._needClick = false;
        this._vx = 0;
        this._vy = 0;
        this.node.angle = 0;
        this.node.setScale(1, 1, 1);
        this._setOpacity(255);
    }

    /** 停动画、解点击、复位运动状态（回池前调用） */
    resetMotion(): void {
        this._stopMotion();
        WeaponDropView.clearSideMark(this.node);
        this._phase = DropPhase.Idle;
        this._battle = null;
        this._pauseBtn = null;
        this._needClick = false;
        this._vx = 0;
        this._vy = 0;
        this._hasBounds = false;
    }

    /** 停 tween / 点击；销毁过程中子节点可能已空，禁止 find */
    private _stopMotion(): void {
        const node = this.node;
        if (!node?.isValid) return;
        Tween.stopAllByTarget(node);
        const op = node.getComponent(UIOpacity);
        if (op) Tween.stopAllByTarget(op);
        node.off(Node.EventType.TOUCH_END, this._onTouchEnd, this);
        this._setClickable(false);
    }

    protected update(dt: number): void {
        if (this._phase !== DropPhase.Drop) return;
        if (this._battle?.IsGamePause) return;
        const node = this.node;
        if (!node?.isValid) return;
        this._vy += GRAVITY * dt;
        node.getWorldPosition(this._pos);
        this._pos.x += this._vx * dt;
        this._pos.y += this._vy * dt;
        this._clampInScreen(this._pos, true);
        if (this._pos.y <= this._groundY && this._vy < 0) {
            this._pos.y = this._groundY;
            this._vy *= -BOUNCE;
            this._vx *= GROUND_FRICTION;
            this._clampInScreen(this._pos, true);
            if (Math.abs(this._vy) < SETTLE_SPEED && Math.abs(this._vx) < SETTLE_SPEED) {
                this._pos.y = this._groundY;
                this._clampInScreen(this._pos, false);
                node.setWorldPosition(this._pos);
                node.angle = 0;
                this._onLanded();
                return;
            }
        }
        node.setWorldPosition(this._pos);
        node.angle = 0;
    }

    protected onDestroy(): void {
        this._stopMotion();
        this._phase = DropPhase.Idle;
        this._battle = null;
        this._pauseBtn = null;
        this._needClick = false;
    }

    /** 落地：敌方自动飞入，己方等待点击 */
    private _onLanded(): void {
        this._vx = 0;
        this._vy = 0;
        if (this._needClick) {
            this._phase = DropPhase.WaitClick;
            this._setClickable(true);
            this.node.on(Node.EventType.TOUCH_END, this._onTouchEnd, this);
            return;
        }
        this._startFly();
    }

    /** 玩家点击拾取 */
    private _handleClick(): void {
        if (this._phase !== DropPhase.WaitClick) return;
        this.node.off(Node.EventType.TOUCH_END, this._onTouchEnd, this);
        this._setClickable(false);
        this._startFly();
    }

    /** 飞向暂停按钮后渐隐回池 */
    private _startFly(): void {
        const node = this.node;
        const target = this._pauseBtn;
        if (!node?.isValid) return;
        this._phase = DropPhase.Fly;
        if (!target?.isValid) {
            console.log('[WeaponDrop] 暂停按钮无效，直接回收');
            this._recycle();
            return;
        }
        Tween.stopAllByTarget(node);
        tween(node)
            .to(FLY_SEC, { worldPosition: target.worldPosition.clone(), scale: new Vec3(0.45, 0.45, 1) }, { easing: 'sineIn' })
            .call(this._onFlyDone)
            .start();
    }

    /** 到达暂停按钮后渐隐 */
    private _finishFly(): void {
        if (!this.node?.isValid) return;
        const op = this.node.getComponent(UIOpacity) ?? this.node.addComponent(UIOpacity);
        Tween.stopAllByTarget(op);
        op.opacity = 255;
        tween(op).to(FADE_SEC, { opacity: 0 }).call(this._onFadeDone).start();
    }

    /** 回池 */
    private _recycle(): void {
        if (!this.node?.isValid) return;
        this.resetMotion();
        this._setOpacity(255);
        this.node.setScale(1, 1, 1);
        this.node.angle = 0;
        gg.res.putNode(this.node);
    }

    /**
     * 设置透明度。
     * @param value 0~255
     */
    private _setOpacity(value: number): void {
        const op = this.node.getComponent(UIOpacity) ?? this.node.addComponent(UIOpacity);
        op.opacity = value;
    }

    /**
     * 开关点击拾取。
     * @param on 是否可点
     */
    private _setClickable(on: boolean): void {
        const node = this.node;
        if (!node?.isValid) return;
        let btn = node.getComponent(Button);
        if (on && !btn) btn = node.addComponent(Button);
        if (!btn) return;
        btn.transition = Button.Transition.NONE;
        btn.interactable = on;
        btn.enabled = on;
    }
}

/**
 * 击杀武器碎片掉落表现。
 */
export class BattleWeaponDropPresenter {
    private _battle: ProjectBattleHandle | null = null;
    private _flyLayer: Node | null = null;
    private _pauseBtn: Node | null = null;
    private _resolveDeathWorldPos: ((victim: EntityId) => Vec3 | null) | null = null;

    /**
     * 绑定战斗、飞行层、暂停按钮与死亡坐标。
     * @param battle 当前战斗
     * @param flyLayer 飞行层
     * @param pauseBtn 暂停按钮
     * @param resolveDeathWorldPos 死亡世界坐标
     */
    bind(battle: ProjectBattleHandle | null, flyLayer: Node | null, pauseBtn: Node | null, resolveDeathWorldPos: (victim: EntityId) => Vec3 | null): void {
        this.unbind();
        this._battle = battle;
        this._flyLayer = flyLayer;
        this._pauseBtn = pauseBtn;
        this._resolveDeathWorldPos = resolveDeathWorldPos;
    }

    /** 注销并回收场上掉落节点 */
    unbind(): void {
        this._recycleAlive();
        this._battle = null;
        this._flyLayer = null;
        this._pauseBtn = null;
        this._resolveDeathWorldPos = null;
    }

    /**
     * 击杀回调：取出待播掉落并生成世界节点。
     * @param victim 死亡实体
     */
    onEntityKilled(victim: EntityId): void {
        const battle = this._battle;
        if (!battle) return;
        const rec = battle.weaponDrop.shiftPendingVisual();
        if (!rec) return;
        const from = this._resolveDeathWorldPos?.(victim);
        if (!from) {
            console.log('[WeaponDrop] 无死亡坐标', victim, rec.weaponId);
            return;
        }
        this._spawnWorld(battle, rec, from);
    }

    /**
     * 在死亡点生成世界掉落。
     * @param battle 当前战斗
     * @param record 掉落记录
     * @param startWorld 死亡世界坐标
     */
    private _spawnWorld(battle: ProjectBattleHandle, record: WeaponDropRecord, startWorld: Readonly<Vec3>): void {
        const layer = this._flyLayer;
        if (!layer?.isValid) {
            console.log('[WeaponDrop] flyLayer 未绑定');
            return;
        }
        const node = WeaponDropView.takePrefab();
        if (!node) return;
        if (!layer.active) layer.active = true;
        layer.addChild(node);
        WeaponDropView.applyVisual(node, record);
        const view = node.getComponent(WeaponDropView) ?? node.addComponent(WeaponDropView);
        view.playWorldDrop(battle, this._pauseBtn, startWorld, record.isSelf);
        BattleAudio.playFragmentDrop();
    }

    /** 回收飞行层上尚未回池的掉落节点 */
    private _recycleAlive(): void {
        const layer = this._flyLayer;
        if (!layer?.isValid) return;
        const children = layer.children.slice();
        for (let i = 0; i < children.length; i++) {
            const node = children[i];
            if (!node?.isValid) continue;
            const view = node.getComponent(WeaponDropView);
            if (!view) continue;
            view.resetMotion();
            gg.res.putNode(node);
        }
    }
}