"use strict";

const FramesBuilder = (function(){

    const FramesBuilder = function(hollow_bond){

        const add = (chunk, inputs) => {

            const id = FrameModel.get_id(inputs.x, inputs.y, inputs.z), 
                  frame = (
                      chunk.frames[id] || 
                      hollow_bond.map.frames[id] || 
                      new FrameModel(hollow_bond, inputs)
                  );

            chunk.frames[id] = frame;
            // chunk.frames_by_position[id] = frame;

            return frame;
        };

        this.generate_seam = chunk => {

            for(let py = chunk.yf; py < chunk.yt; py ++){

                [[chunk.xf, "west"], [chunk.xt, "east"]].forEach(([wall_x, neighbor]) => {
                    if(chunk.neighbors[neighbor])
                        for(let cursor_z = chunk.zf, i = 0; cursor_z < chunk.zt; i ++)
                            (
                                cursor_z += Math.floor(hollow_bond.hash.seam_vertical_x(wall_x, py, chunk.zf, py + 1, chunk.zt, i) * hollow_bond.chunk_frame_maximum_gap) + 1
                            ) < chunk.zt && add(chunk, {
                                x : wall_x, 
                                y : py, 
                                z : cursor_z, 
                                axis : "vertical"
                            });
                });

                [[chunk.zf, "north"], [chunk.zt, "south"]].forEach(([wall_z, neighbor]) => {
                    if(chunk.neighbors[neighbor])
                        for(let cursor_x = chunk.xf, i = 0; cursor_x < chunk.xt; i ++)
                            (
                                cursor_x += Math.floor(hollow_bond.hash.seam_vertical_z(chunk.xf, py, wall_z, chunk.xt, py + 1, i) * hollow_bond.chunk_frame_maximum_gap) + 1
                            ) < chunk.xt && add(chunk, {
                                x : cursor_x, 
                                y : py, 
                                z : wall_z, 
                                axis : "horizontal"
                            });
                });

            };

            return chunk.frames;
        };

    };

    return FramesBuilder;
})();