import math

from ezdxf.enums import TextEntityAlignment

import core


class AirDuctDrawer:
    def __init__(self,msp,layer,from_,to,width):
        self.msp = msp
        self.layer = layer
        self.from_ = from_
        self.to = to
        self.width = width

        #              a1 b1
        # c1----------c2|F|c3
        #      center a2  b2
    def draw_air_duct_list(self):
        distance = core.distance(self.from_,self.to)
        ad_len = self.get_draw_air_duct_len()
        from_ = self.from_
        route_ = core.calculate_angle_with_x_axis(self.from_,self.to)
        while distance > ad_len:
            to_ = core.find_point_on_segment(from_,self.to,ad_len)

            center_ = core.find_point_on_line(from_,to_,1/2)

            self.draw_air_duct(center_,route_)

            from_ =  to_

            distance = distance - ad_len

        self.msp.add_line(from_, self.to,
                          dxfattribs={"layer": f"图层{self.layer}", "color": core.get_color_by_layer(self.layer)})


    def get_draw_air_duct_len(self):
        return self.width * 3


    def draw_air_duct(self,center,route):
        c1 = center[0]-self.width*1.5,center[1]
        c2 = center[0]+self.width*1,center[1]

        c1 = core.rotate_point_around_another(c1,center,route)
        c2 = core.rotate_point_around_another(c2,center,route)

        self.msp.add_line(c1, c2,
                          dxfattribs={"layer": f"图层{self.layer}", "color": core.get_color_by_layer(self.layer)})

        a1 =  center[0]+self.width*1,center[1]+self.width*1/6
        a2 =  center[0]+self.width*1,center[1]-self.width*1/6

        a1 = core.rotate_point_around_another(a1,center,route)
        a2 = core.rotate_point_around_another(a2,center,route)

        self.msp.add_line(a1, a2,
                          dxfattribs={"layer": f"图层{self.layer}", "color": core.get_color_by_layer(self.layer)})

        f = center[0]+self.width*1.25,center[1]
        f = core.rotate_point_around_another(f, center, route)

        angle = math.degrees(route+math.pi)
        dxfattribs = {
            'insert': f, 'style': 'msyh', 'color': core.get_color_by_layer(self.layer),
            "layer": f"图层{self.layer}",
        }

        self.msp.add_text("F", rotation=angle, dxfattribs=dxfattribs, height=self.width/6).set_placement(f, align=TextEntityAlignment.MIDDLE_CENTER)

        b1 =  center[0]+self.width*1.5,center[1]+self.width*1/6
        b2 =  center[0]+self.width*1.5,center[1]-self.width*1/6

        b1 = core.rotate_point_around_another(b1,center,route)
        b2 = core.rotate_point_around_another(b2,center,route)

        self.msp.add_line(b1, b2,
                          dxfattribs={"layer": f"图层{self.layer}", "color": core.get_color_by_layer(self.layer)})