/******************************************************************
 * Copyright(C) 2019 - 2020 Nx Studio
 *
 * 视图绑定组件--战斗相机
 *
 *                                  2018.05.18
 ******************************************************************/

cc.Class( {

    extends: cc.Component,

    properties: {

        camera: {
            default: null,
            type: cc.Camera,
            displayName: "战斗相机"
        },
    },

    // 显示
    onEnable: function() {
        nx.bridge.camBattle = this;
    },

    // 隐藏
    onDisable: function() {
        nx.bridge.camBattle = null
    },

    // 归位重置
    reset: function( _secs = 0, _cb = nx.dt.fnEmpty ) {
        this.moveTo( cc.Vec2.ZERO, _secs, _cb );
        this.zoomTo( 1, _secs );
    },

    // ------------------------------------------------------------------------
    // 移动&&聚焦
    // ------------------------------------------------------------------------

    // 计算多目标中心
    getCenter: function( _tars ) {

        if( nx.dt.arrEmpty( _tars ) ) {
            return cc.Vec2.ZERO;
        }

        let parent = this.camera.node.parent;
        let local = function( _node ) {
            let pos = _node.convertToWorldSpaceAR( cc.Vec2.ZERO );
            return parent.convertToNodeSpaceAR( pos );
        };

        let center = local( _tars[ 0 ] );
        if( _tars.length == 1 ) {
            return center;
        }

        for( let i = 1; i < _tars.length; ++i ) {
            let t2 = _tars[ i ];
            if( !t2 ) {
                continue;
            }

            let p2 = local( t2 );
            center.x = ( center.x + p2.x ) / 2;
            center.y = ( center.y + p2.y ) / 2;
        }

        return center;
    },

    // 多点目标中心聚焦移动
    focusMut: function( _tars, _secs, _offset = cc.Vec2.ZERO, _cb = nx.dt.fnEmpty ) {

        if( nx.dt.arrEmpty( _tars ) ) {
            nx.error( `$CameraBattle:聚焦目标为空!` );
            return this;
        }

        if( !nx.dt.numPositive( _secs, true ) ) {
            nx.error( `$CameraBattle:聚焦参数不全!` );
            return this;
        }

        // 计算中心点
        let pos = this.getCenter( _tars );
        pos.x += _offset.x;
        pos.y += _offset.y;
        return this.moveTo( pos, _secs, _cb );
    },

    // 聚焦移动
    focus: function( _tar, _secs, _offset = cc.Vec2.ZERO, _cb = nx.dt.fnEmpty ) {

        if( nx.dt.objEmpty( _tar ) ) {
            nx.error( `$CameraBattle:聚焦目标为空!` );
            return this;
        }

        return this.focusMut( [ _tar ], _secs, _offset, _cb );
    },

    // 位置移动
    moveTo: function( _pos, _secs, _cb = nx.dt.fnEmpty, _key = 'cubicOut' ) {

        // 瞬间
        if( !nx.dt.numPositive( _secs, false ) ) {
            this.camera.node.position = _pos;
            nx.dt.fnInvoke( _cb );
            return this;
        }

        // 移动
        nx.tween.moveToEasing( this.camera, "", _secs, _pos, _key, () => {
            nx.dt.fnInvoke( _cb );
        } );

        return this;
    },

    // ------------------------------------------------------------------------
    // 视野缩放
    // ------------------------------------------------------------------------

    // 缩放
    zoomTo: function( _ratio, _secs, _cb = nx.dt.fnEmpty ) {

        this.zooming = false;

        // 无效缩水
        if( !nx.dt.numPositive( _ratio, false ) ||
            Math.abs( _ratio - this.camera.zoomRatio ) <= 0.01 ) {
            nx.dt.fnInvoke( _cb );
            return;
        }

        // 瞬间
        if( !nx.dt.numPositive( _secs, false ) ) {
            this.camera.zoomRatio = _ratio;
            nx.dt.fnInvoke( _cb );
            return;
        }

        // 缩放参数
        this.ratio = _ratio;
        this.rps = ( _ratio - this.camera.zoomRatio ) / _secs;
        this.zooming = true;
        this.cbZoom = _cb;
    },

    // 更新
    update: function( _dt ) {

        if( !this.zooming ) {
            return;
        }

        this.camera.zoomRatio += this.rps * _dt;

        // 缩停止
        if( this.rps < 0 && this.camera.zoomRatio <= this.ratio ) {
            this.camera.zoomRatio = this.ratio;
            this.zooming = false;
            nx.dt.fnInvoke( this.cbZoom );
            this.cbZoom = null;
            return;
        }

        // 扩停止
        if( this.rps >= 0 && this.camera.zoomRatio >= this.ratio ) {
            this.camera.zoomRatio = this.ratio;
            this.zooming = false;
            nx.dt.fnInvoke( this.cbZoom );
            this.cbZoom = null;
            return;
        }
    },

    // ------------------------------------------------------------------------
    // 相机抖动
    // ------------------------------------------------------------------------

    shake: function( _level, _secs, _cb = nx.dt.fnEmpty ) {

        let ofs = cc.v2( 10, 10 );
        switch( _level ) {
            case 1: ofs = cc.v2( 20, 20 ); break;
            case 2: ofs = cc.v2( 30, 30 ); break;
            case 3: ofs = cc.v2( 40, 40 ); break;
            case 4: ofs = cc.v2( 50, 50 ); break;
            default: break;
        }

        nx.tween.shake( this.camera, "", _secs, ofs, _cb );
    },

} );