import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
import { HeroViewComp } from "./HeroViewComp";
import { HeroAttrsComp } from "./HeroAttrsComp";
import { smc } from "../common/SingletonModuleComp";
import { FacSet } from "../common/config/GameSet";
import { HeroDisVal, HType } from "../common/config/heroSet";
import { BoxCollider2D, Node } from "cc";

@ecs.register('MoveComp')
export class MoveComp extends ecs.Comp {
    /** 朝向：1=向右，-1=向左 */
    direction: number = 1;
    /** 当前移动目标 X（战斗/回位都会更新） */
    targetX: number = 0;
    /** 是否允许移动（出生落地前会短暂关闭） */
    moving: boolean = true;
    /** 预留：目标 Y（当前逻辑主要使用 baseY 锁定地平线） */
    targetY: number = 0;
    /** 角色所属车道的地平线 Y，移动时强制贴地 */
    baseY: number = 0;
    /** 预留：车道索引 */
    lane: number = 0;
    /** 出生序，用于同条件渲染排序稳定 */
    spawnOrder: number = 0;

    reset() {
        this.direction = 1;
        this.targetX = 0;
        this.moving = true;
        this.targetY = 0;
        this.baseY = 0;
        this.lane = 0;
        this.spawnOrder = 0;
    }
}

interface MoveFacConfig {
    /** 阵营可前进边界（靠近敌方一侧） */
    moveFrontX: number;
    /** 阵营可后退边界（靠近己方一侧） */
    moveBackX: number;
    /** 被逼退时前侧安全边界 */
    retreatFrontX: number;
    /** 被逼退时后侧安全边界 */
    retreatBackX: number;
}

@ecs.register('MoveSystem')
export class MoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate {
    /** 近战判定射程（来自 heroSet） */
    private readonly meleeAttackRange = HeroDisVal[HType.Melee];
    private readonly heroFrontAnchorX = -30;
    private readonly monFrontAnchorX = 30;
    /** 常规同阵营横向最小间距 */
    private readonly allySpacingX = 60;
    /** 纵向判定为同排的最大 Y 差 */
    private readonly minSpacingY = 30;
    /** 渲染层级重排节流，避免每帧排序 */
    private readonly renderSortInterval = 0.05;
    private lastRenderSortAt = 0;
    private heroMoveMatcher: ecs.IMatcher | null = null;
    private heroViewMatcher: ecs.IMatcher | null = null;
    private readonly renderEntries: { node: Node; bossPriority: number; frontScore: number; spawnOrder: number; eid: number }[] = [];
    private renderEntryCount = 0;

    /**
     * 阵营可移动边界配置。
     * HERO 在左侧出生并向右推进；MON 在右侧出生并向左推进。
     */
    private readonly facConfigs: Record<number, MoveFacConfig> = {
        [FacSet.HERO]: {
            moveFrontX: 999999,
            moveBackX: -999999,
            retreatFrontX: 999999,
            retreatBackX: -999999,
        },
        [FacSet.MON]: {
            moveFrontX: -999999,
            moveBackX: 999999,
            retreatFrontX: -999999,
            retreatBackX: 999999,
        }
    };

    private getHeroMoveMatcher(): ecs.IMatcher {
        if (!this.heroMoveMatcher) {
            this.heroMoveMatcher = ecs.allOf(HeroAttrsComp, HeroViewComp, MoveComp);
        }
        return this.heroMoveMatcher;
    }

    private getHeroViewMatcher(): ecs.IMatcher {
        if (!this.heroViewMatcher) {
            this.heroViewMatcher = ecs.allOf(HeroAttrsComp, HeroViewComp);
        }
        return this.heroViewMatcher;
    }

    filter(): ecs.IMatcher {
        return ecs.allOf(MoveComp, HeroViewComp, HeroAttrsComp);
    }

    update(e: ecs.Entity) {
        /** 战斗未开始/暂停时不驱动移动 */
        if (!smc.mission.play || smc.mission.pause) return;
        const model = e.get(HeroAttrsComp);
        const move = e.get(MoveComp);
        const view = e.get(HeroViewComp);
        if (!model || !move || !view || !view.node) return;
        if (model.fac !== FacSet.HERO && model.fac !== FacSet.MON) return;
        if (!move.moving) return;
        /** 关卡阶段性冻结怪物行为 */
        if (model.fac === FacSet.MON && smc.mission.stop_mon_action) {
            this.clearCombatTarget(model);
            view.status_change("idle");
            return;
        }
        if (model.is_stop || model.is_dead || model.is_reviving || model.isFrost()) {
            this.clearCombatTarget(model);
            if (!model.is_reviving) view.status_change("idle");
            return;
        }

        /** 所有移动都锁定在 baseY，避免出现“漂移” */
        if (view.node.position.y !== move.baseY) {
            view.node.setPosition(view.node.position.x, move.baseY, 0);
        }
        this.updateRenderOrder(view);
        const nearestEnemy = this.findNearestEnemy(e);
        if (nearestEnemy) {
            /** 有敌人：进入战斗位移逻辑 */
            this.processCombatLogic(e, move, view, model, nearestEnemy);
            this.syncCombatTarget(model, view, nearestEnemy);
        } else {
            /** 无敌人：清目标并回归编队站位 */
            this.clearCombatTarget(model);
            move.targetY = 0;
            this.processReturnFormation(e, move, view, model);
            model.is_atking = false;
        }
    }

    private clearCombatTarget(model: HeroAttrsComp): void {
        model.combat_target_eid = -1;
        model.enemy_in_cast_range = false;
    }

    private syncCombatTarget(model: HeroAttrsComp, selfView: HeroViewComp, enemyView: HeroViewComp): void {
        if (!enemyView || !enemyView.node || !enemyView.ent) {
            this.clearCombatTarget(model);
            return;
        }
        const enemyAttrs = enemyView.ent.get(HeroAttrsComp);
        if (!enemyAttrs || enemyAttrs.is_dead || enemyAttrs.is_reviving || enemyAttrs.fac === model.fac) {
            this.clearCombatTarget(model);
            return;
        }
        model.combat_target_eid = enemyView.ent.eid;
        model.enemy_in_cast_range = this.isEnemyInAttackRange(model, selfView.node.position.x, enemyView.node.position.x);
    }

    private isEnemyInAttackRange(model: HeroAttrsComp, selfX: number, enemyX: number): boolean {
        const dist = Math.abs(selfX - enemyX);
        const rangeType = model.type as HType.Melee | HType.Mid | HType.Long;
        if (rangeType === HType.Melee) return dist <= this.meleeAttackRange;
        if (rangeType === HType.Long) {
            const [, maxRange] = this.resolveCombatRange(model, 360, 720);
            return dist <= maxRange;
        }
        const [, maxRange] = this.resolveCombatRange(model, 120, 360);
        return dist <= maxRange;
    }

    private processCombatLogic(e: ecs.Entity, move: MoveComp, view: HeroViewComp, model: HeroAttrsComp, enemy: HeroViewComp) {
        const rangeType = model.type as HType.Melee | HType.Mid | HType.Long;
        switch (rangeType) {
            case HType.Melee:
                this.processMeleeLogic(e, move, view, model, enemy);
                break;
            case HType.Mid:
                this.processMidLogic(e, move, view, model, enemy);
                break;
            case HType.Long:
                this.processLongLogic(e, move, view, model, enemy);
                break;
            default:
                this.processMidLogic(e, move, view, model, enemy); // 默认中程
                break;
        }
    }

    private processMeleeLogic(e: ecs.Entity, move: MoveComp, view: HeroViewComp, model: HeroAttrsComp, enemy: HeroViewComp) {
        this.processFormationCombat(e, move, view, model);
    }

    private processMidLogic(e: ecs.Entity, move: MoveComp, view: HeroViewComp, model: HeroAttrsComp, enemy: HeroViewComp) {
        this.processFormationCombat(e, move, view, model);
    }

    private processLongLogic(e: ecs.Entity, move: MoveComp, view: HeroViewComp, model: HeroAttrsComp, enemy: HeroViewComp) {
        this.processFormationCombat(e, move, view, model);
    }

    private processFormationCombat(e: ecs.Entity, move: MoveComp, view: HeroViewComp, model: HeroAttrsComp) {
        const targetX = this.getFormationSlotX(e, model, move.baseY);
        move.targetX = targetX;
        this.moveToSlot(view, move, model, targetX);
        model.is_atking = true;
    }

    private processReturnFormation(e: ecs.Entity, move: MoveComp, view: HeroViewComp, model: HeroAttrsComp) {
        const targetX = this.getFormationSlotX(e, model, move.baseY);
        move.targetX = targetX;
        this.moveToSlot(view, move, model, targetX);
    }

    private getFormationSlotX(self: ecs.Entity, model: HeroAttrsComp, baseY: number): number {
        const cfg = this.facConfigs[model.fac] || this.facConfigs[FacSet.HERO];
        const moveMinX = Math.min(cfg.moveBackX, cfg.moveFrontX);
        const moveMaxX = Math.max(cfg.moveBackX, cfg.moveFrontX);
        const forwardDir = model.fac === FacSet.MON ? -1 : 1;
        const laneAllies: ecs.Entity[] = [];
        ecs.query(this.getHeroMoveMatcher()).forEach(e => {
            if (!this.isFormationParticipant(e, model.fac, baseY)) return;
            laneAllies.push(e);
        });
        laneAllies.sort((a, b) => {
            const attrsA = a.get(HeroAttrsComp);
            const attrsB = b.get(HeroAttrsComp);
            const priorityA = attrsA ? this.getCombatPriority(attrsA) : 0;
            const priorityB = attrsB ? this.getCombatPriority(attrsB) : 0;
            if (priorityA !== priorityB) return priorityB - priorityA;
            const lvA = attrsA?.lv ?? 1;
            const lvB = attrsB?.lv ?? 1;
            if (lvA !== lvB) return lvB - lvA;
            const moveA = a.get(MoveComp);
            const moveB = b.get(MoveComp);
            const orderA = moveA?.spawnOrder ?? 0;
            const orderB = moveB?.spawnOrder ?? 0;
            if (orderA !== orderB) return orderA - orderB;
            return a.eid - b.eid;
        });
        const slotIndex = Math.max(0, laneAllies.findIndex(entity => entity === self));
        const frontAnchorX = model.fac === FacSet.MON ? this.monFrontAnchorX : this.heroFrontAnchorX;
        const targetX = frontAnchorX - forwardDir * slotIndex * this.allySpacingX;
        return Math.max(moveMinX, Math.min(moveMaxX, targetX));
    }

    private moveToSlot(view: HeroViewComp, move: MoveComp, model: HeroAttrsComp, targetX: number) {
        const currentX = view.node.position.x;
        if (Math.abs(currentX - targetX) <= 2) {
            view.node.setPosition(targetX, move.baseY, 0);
            view.status_change("idle");
            return;
        }
        const dir = targetX > currentX ? 1 : -1;
        move.direction = dir;
        const speed = model.speed / 3;
        this.moveEntity(view, dir, speed, targetX);
    }

    private moveEntity(view: HeroViewComp, direction: number, speed: number, stopAtX?: number) {
        const model = view.ent.get(HeroAttrsComp);
        const move = view.ent.get(MoveComp);
        if (!model || !move) return;
        /** 按阵营边界裁剪，防止跑出战场可移动区域 */
        const cfg = this.facConfigs[model.fac] || this.facConfigs[FacSet.HERO];
        const moveMinX = Math.min(cfg.moveBackX, cfg.moveFrontX);
        const moveMaxX = Math.max(cfg.moveBackX, cfg.moveFrontX);
        const currentX = view.node.position.x;
        const delta = speed * this.dt * direction;
        let newX = view.node.position.x + delta;
        if (currentX < moveMinX && direction < 0) {
            view.status_change("idle");
            return;
        }
        if (currentX > moveMaxX && direction > 0) {
            view.status_change("idle");
            return;
        }
        newX = Math.max(moveMinX, Math.min(moveMaxX, newX));
        if (stopAtX !== undefined) {
            /** 指定停止点时，限制不越过 stopAtX */
            newX = direction > 0 ? Math.min(newX, stopAtX) : Math.max(newX, stopAtX);
        }
        if (Math.abs(newX - currentX) < 0.01) {
            view.status_change("idle");
            return;
        }
        view.node.setPosition(newX, move.baseY, 0);
        view.status_change("move");
    }

    private getCombatPriority(model: HeroAttrsComp): number {
        /** 数值越大越靠前：近战 > 中程 > 远程 */
        const rangeType = model.type as HType.Melee | HType.Mid | HType.Long;
        if (rangeType === HType.Melee) return 3;
        if (rangeType === HType.Mid) return 2;
        return 1;
    }

    private isFormationParticipant(entity: ecs.Entity, fac: number, baseY: number): boolean {
        const attrs = entity.get(HeroAttrsComp);
        const view = entity.get(HeroViewComp);
        const move = entity.get(MoveComp);
        if (!attrs || !view?.node || !move) return false;
        if (attrs.is_dead || attrs.is_reviving) return false;
        if (attrs.fac !== fac) return false;
        if (!move.moving) return false;
        if (Math.abs(view.node.position.y - baseY) >= this.minSpacingY) return false;
        const collider = view.node.getComponent(BoxCollider2D);
        if (collider && !collider.enabled) return false;
        return true;
    }

    private resolveCombatRange(model: HeroAttrsComp, defaultMin: number, defaultMax: number): [number, number] {
        const minRange = model.getCachedMinSkillDistance();
        const maxRange = model.getCachedMaxSkillDistance();
        if (maxRange <= 0) return [defaultMin, defaultMax];
        const safeMin = Math.max(0, Math.min(minRange, maxRange - 20));
        return [safeMin, maxRange];
    }

    private findNearestEnemy(entity: ecs.Entity): HeroViewComp | null {
        const currentView = entity.get(HeroViewComp);
        if (!currentView?.node) return null;
        
        const currentPos = currentView.node.position;
        const myFac = entity.get(HeroAttrsComp).fac;
        
        let nearest: HeroViewComp | null = null;
        let minDis = Infinity;
        
        /** 一次遍历筛出最近敌人（仅比较 x 轴距离） */
        ecs.query(this.getHeroViewMatcher()).forEach(e => {
            const m = e.get(HeroAttrsComp);
            if (m.fac !== myFac && !m.is_dead) {
                const v = e.get(HeroViewComp);
                if (v?.node) {
                    const d = Math.abs(currentPos.x - v.node.position.x);
                    if (d < minDis) {
                        minDis = d;
                        nearest = v;
                    }
                }
            }
        });
        return nearest;
    }

    private updateRenderOrder(view: HeroViewComp) {
        const scene = smc.map?.MapView?.scene;
        const actorRoot = scene?.entityLayer?.node?.getChildByName("HERO");
        if (!actorRoot) return;

        if (view.node.parent !== actorRoot) {
            view.node.parent = actorRoot;
        }

        const now = Date.now() / 1000;
        if (now - this.lastRenderSortAt < this.renderSortInterval) return;
        this.lastRenderSortAt = now;

        this.renderEntryCount = 0;
        ecs.query(this.getHeroMoveMatcher()).forEach(e => {
            const attrs = e.get(HeroAttrsComp);
            const actorView = e.get(HeroViewComp);
            const actorMove = e.get(MoveComp);
            if (!attrs || !actorView?.node || !actorMove || attrs.is_dead) return;
            if (attrs.fac !== FacSet.HERO && attrs.fac !== FacSet.MON) return;
            if (actorView.node.parent !== actorRoot) {
                actorView.node.parent = actorRoot;
            }
            const frontScore = attrs.fac === FacSet.HERO ? actorView.node.position.x : -actorView.node.position.x;
            const entryIndex = this.renderEntryCount;
            let entry = this.renderEntries[entryIndex];
            if (!entry) {
                entry = { node: actorView.node, bossPriority: 0, frontScore: 0, spawnOrder: 0, eid: 0 };
                this.renderEntries.push(entry);
            }
            entry.node = actorView.node;
            entry.bossPriority = attrs.is_boss ? 1 : 0;
            entry.frontScore = frontScore;
            entry.spawnOrder = actorMove.spawnOrder;
            entry.eid = e.eid;
            this.renderEntryCount += 1;
        });
        this.renderEntries.length = this.renderEntryCount;

        /** 定时重排同层节点：Boss 优先级 -> 前后位置 -> 出生序 -> eid */
        this.renderEntries.sort((a, b) => {
            if (a.bossPriority !== b.bossPriority) return a.bossPriority - b.bossPriority;
            if (a.frontScore !== b.frontScore) return a.frontScore - b.frontScore;
            if (a.spawnOrder !== b.spawnOrder) return a.spawnOrder - b.spawnOrder;
            return a.eid - b.eid;
        });

        this.renderEntries.forEach((item, index) => {
            item.node.setSiblingIndex(index);
        });
    }
}