import type { BattleSession } from 'db://assets/mx/module/battle';
import { isCampAreaScoped } from 'db://assets/mx/module/battle';
import type { IMapPathChecker } from 'db://assets/mx/module/merge';
import { MapCellKind } from 'db://assets/mx/module/merge';
import type { CocosMapView } from '../map/legacy/MapManager';
import type { MapGrid } from '../map/legacy/MapGrid';
import { mapGridToLogicCell } from '../map/BattleMapSpec';
import { Vec3 } from 'cc';

/** CocosMapView 格状态桥接 + MX Pathfinder 可达性（业务规则在项目层） */
export class MapPlaceValidator implements IMapPathChecker {
    /** 落子归属玩家（0 本机 → CampArea 1；1 敌方/AI → CampArea 2） */
    private readonly _ownerPlayerId: number;

    /**
     * @param _map 地图
     * @param _session 战斗会话（提供 campPolicy）
     * @param ownerPlayerId 落子归属玩家槽
     */
    constructor(
        private readonly _map: CocosMapView,
        private readonly _session?: BattleSession,
        ownerPlayerId = 0,
    ) {
        this._ownerPlayerId = Math.max(0, Math.floor(Number(ownerPlayerId) || 0));
    }

    get session(): BattleSession | undefined {
        return this._session;
    }

    /**
     * 所属玩家是否可在该格落子（placeValidation 开启时须本阵营 CampAreaID）。
     * 单阵营 / 未开隔离时恒 true。
     */
    isAllowedCampForPlace(gridIndex: number): boolean {
        const camp = this._ownerCampAreaId();
        if (camp == null) return true;
        return this.isOwnerCampCell(gridIndex);
    }

    /**
     * 是否所属玩家阵营格（0→1、1→2）。不看 placeValidation。
     * @param gridIndex 地图格
     */
    isOwnerCampCell(gridIndex: number): boolean {
        const grid = this._map.getMapGridByIndex(gridIndex);
        if (!grid) return false;
        return (grid.CampAreaID | 0) === this._ownerPlayerId + 1;
    }

    /**
     * 所属玩家放置区 CampAreaID；无需校验时返回 null。
     * 与地图标注一致：playerId 0→1、1→2（不作出怪口反查）。
     */
    private _ownerCampAreaId(): number | null {
        const session = this._session;
        if (!session || !isCampAreaScoped(session.campPolicy, 'placeValidation')) {
            return null;
        }
        return this._ownerPlayerId + 1;
    }

    isCanPutGrid(gridIndex: number): boolean {
        return !!this._map.getMapGridByIndex(gridIndex)?.isCanPutGrid;
    }

    isSpiderWebBlocked(gridIndex: number): boolean {
        const grid = this._map.getMapGridByIndex(gridIndex);
        if (!grid) return false;
        if (grid.hasSpiderWeb) return true;
        const silk = grid.node?.getChildByName('spiderSilk');
        return !!silk?.isValid && silk.active;
    }

    getLiveCellKind(gridIndex: number): MapCellKind | null {
        const grid = this._map.getMapGridByIndex(gridIndex);
        if (!grid) return null;
        if (grid.isCanWalk) return MapCellKind.Walkable;
        // 编辑误配 dig+putText 双标时：可放置优先（不当 Dig）
        if (grid.isCanPutText) return MapCellKind.Put;
        if (grid.isAreaUnlock) return MapCellKind.Unlock;
        if (grid.isCanBeDig) return MapCellKind.Dig;
        return MapCellKind.Put;
    }

    canPlaceType3Grid(gridIndex: number): boolean {
        const grid = this._map.getMapGridByIndex(gridIndex);
        if (!grid?.isCanPutGrid) return false;

        if (!this._session) {
            console.error('[MapPlaceValidator] canPlaceType3Grid: session missing');
            return false;
        }
        const cell = this._gridToLogic(grid);
        if (!cell) return false;

        if (this._session.topology.enablePatrolLoop) {
            const loop = this._session.topology.patrolLoop;
            if (!loop.length) {
                console.error('[MapPlaceValidator] canPlaceType3Grid: patrolLoop empty');
                return false;
            }
            for (let i = 0; i < loop.length; i++) {
                if (loop[i].row === cell.row && loop[i].col === cell.col) {
                    return false;
                }
            }
            return true;
        }

        if (!this._session.topology.attackTargets.length) {
            console.error('[MapPlaceValidator] canPlaceType3Grid: attackTargets empty');
            return false;
        }
        const spawns = this._session.topology.getAllSpawnCells();
        if (!spawns.length) {
            console.error('[MapPlaceValidator] canPlaceType3Grid: spawnPorts empty');
            return false;
        }
        try {
            return this._session.pathfinder.checkMultiSourceReachability(
                spawns,
                this._session.topology.attackTargets,
                cell,
                false,
            );
        } catch (e) {
            console.error('[MapPlaceValidator] canPlaceType3Grid pathfinder error', String(e));
            return false;
        }
    }

    /**
     * 将逻辑层格语义写回 MapGrid，并同步 MX GridMap。
     * @returns MX 可走性是否相对同步前发生变化
     */
    applyCellKind(grid: MapGrid, kind: MapCellKind): boolean {
        switch (kind) {
            case MapCellKind.Walkable:
                grid.isCanWalk = true;
                grid.isCanPutText = false;
                grid.isCanBeDig = false;
                break;
            case MapCellKind.Dig:
                grid.isCanWalk = false;
                grid.isCanPutText = false;
                grid.isCanBeDig = true;
                break;
            case MapCellKind.Unlock:
                grid.isCanWalk = false;
                grid.isCanPutText = false;
                grid.isCanBeDig = true;
                break;
            case MapCellKind.Put:
                // Dig→Put / 可放置格：一律不可走（路上铲开的空 Put 也必须挡路）
                grid.isCanWalk = false;
                grid.isCanPutText = true;
                grid.isCanBeDig = false;
                break;
        }
        grid.updateGrid();
        return this._syncCellToSession(grid);
    }

    /**
     * 同步单格到 MX：以 MapGrid 为准对齐 walkable（纠正 Dig 路障与 MX 默认 true 的分叉）。
     * @returns MX 可走性是否变化
     */
    private _syncCellToSession(grid: MapGrid): boolean {
        if (!this._session) return false;
        const cell = this._gridToLogic(grid);
        if (!cell) return false;
        const walkable = !!grid.isCanWalk;
        const walkChanged = this._session.grid.isWalkable(cell) !== walkable;
        if (walkChanged) {
            this._session.grid.setWalkable(cell, walkable);
        }
        this._session.grid.setBuildable(cell, grid.isCanPutText || grid.isCanPutGrid);
        return walkChanged;
    }

    snapshotCell(grid: MapGrid): { kind: MapCellKind; builtinPut: boolean; canPutGrid: boolean } {
        let kind: MapCellKind;
        if (grid.isCanWalk) {
            kind = MapCellKind.Walkable;
        } else if (grid.isCanPutText) {
            // 可放置优先：dig+putText 双标按 Put 入逻辑层，避免 AI/玩家无法落子
            kind = MapCellKind.Put;
        } else if (grid.isAreaUnlock) {
            kind = MapCellKind.Unlock;
        } else if (grid.isCanBeDig) {
            kind = MapCellKind.Dig;
        } else {
            kind = MapCellKind.Put;
        }
        const builtinPut = kind === MapCellKind.Put;
        return { kind, builtinPut, canPutGrid: grid.isCanPutGrid };
    }

    /**
     * 将 MapGrid 可走性同步到 MX GridMap。
     * 可走性只跟格语义（Walkable/Put/Dig）有关；放字块不挡路。
     * @returns 是否有格子的可走性发生了变化
     */
    resyncWalkabilityFromMap(_isExtraBlocked?: (gridIndex: number) => boolean): boolean {
        if (!this._session) return false;
        let changed = false;
        const logicRows = this._session.grid.rows;
        const logicCols = this._session.grid.cols;
        for (let row = 0; row < logicRows; row++) {
            for (let col = 0; col < logicCols; col++) {
                const grid = this._map.getMapGrid(row, col);
                if (!grid) continue;
                const cell = { row, col };
                const walkable = !!grid.isCanWalk;
                if (this._session.grid.isWalkable(cell) !== walkable) {
                    changed = true;
                }
                this._session.grid.setWalkable(cell, walkable);
                this._session.grid.setBuildable(cell, grid.isCanPutText || grid.isCanPutGrid);
            }
        }
        return changed;
    }

    /**
     * 同步可走性并重建寻路、刷新怪物路径。
     * @param forceRefresh 为 true 时即使可走性未变也刷新（例如雷劈改图）
     */
    notifyWalkStateChanged(forceRefresh = true): void {
        this._map.notifyMapWalkStateChanged();
        if (!this._session) return;
        if (forceRefresh) {
            this._session.notifyWalkabilityChanged();
        }
    }

    getGridByIndex(index: number): MapGrid | null {
        return this._map.getMapGridByIndex(index);
    }

    getGridByWorldPos(pos: Vec3): MapGrid | null {
        return this._map.getMapGridByWorldPos(pos);
    }

    private _gridToLogic(grid: MapGrid): { row: number; col: number } | null {
        if (!this._session) return null;
        return mapGridToLogicCell(grid.Row, grid.Col, this._session.grid.rows, this._session.grid.cols);
    }
}