import copy
import math
import ezdxf
from ezdxf.math import UCS

from type3d import Vector3D
import numpy as np
import transformation
from typing import List, Union, Tuple


def draw_text(msp, text, text_point):
    text_entity = msp.add_text(
        text=text,
        dxfattribs={
            # text rotation angle in degrees in OCS
            "thickness": 0.333,
            "color": 1,
            "style": "TXT",
            "height": 2,
        },
    )
    # set text position in OCS
    text_entity.set_pos(text_point, align="MIDDLE_CENTER")


class Line:
    def __init__(
        self,
        msp,
        start_p: Vector3D,
        end_p: Vector3D,
        tension_k: float,
        n_point: int,
    ):
        self._msp = msp
        self._start_p: Vector3D = start_p
        self._end_p: Vector3D = end_p
        self._tension_k: float = tension_k
        self._n_point: int = n_point
        self._span = 0
        self._points = None
        self._rotation = None

    def curve(self,draw=False)->List:
        if self._points:
            return self._points
        start_p = self._start_p
        end_p = self._end_p
        tension_k = self._tension_k
        n_point = self._n_point
        # 右手坐标系，Z朝上
        line = Vector3D(end_p.x, end_p.y, end_p.z) - Vector3D(
            start_p.x, start_p.y, start_p.z
        )
        # 计算与X轴的角度，画弧垂。先沿Z轴旋转到xz平面的x正半轴上。
        xy_project = copy.deepcopy(line)  # 投影到xy平面上
        xy_project.z = 0
        x_abs_angel = xy_project.angle_to(Vector3D(1, 0, 0))
        x_angel = x_abs_angel * np.sign(xy_project.y)
        height = end_p.z - start_p.z
        span: float = abs(xy_project)
        self._span = span
        span_l = np.linspace(0, span, n_point)  # 档距
        z_points: Tuple[float] = (
            start_p.z
            + span_l * height / span
            - span_l * (span - span_l) * tension_k / math.cos(math.atan(height / span))
        )
        p_points: List[
            Union[List[float, float, float], Tuple[float, float, float]]
        ] = list()  # 未旋转之前的伪坐标
        for foo in range(len(span_l)):
            p_points.append((span_l[foo] + start_p.x, start_p.y, z_points[foo]))
        # 绕起点，在Z轴方向旋转
        rotation = transformation.Rotation(
            x_angel,
            [start_p.x, start_p.y, start_p.z],
            [start_p.x, start_p.y, start_p.z + 1],
        )
        self._rotation = rotation
        points = rotation.rotate(
            p_points,
        )
        self._points = points
        if draw:
            msp = self._msp
            msp.add_polyline3d(points)
        return points

    def sag(self,draw=False):
        start_p = self._start_p
        end_p = self._end_p
        span = self._span
        height = end_p.z - start_p.z
        middle_span = span / 2
        points = self._points
        n_point = self._n_point
        middle_z = points[int(n_point / 2)][2]
        rotation = self._rotation
        p_sag_points = [
            [start_p.x, start_p.y, start_p.z],
            [
                middle_span + start_p.x,
                start_p.y,
                start_p.z + middle_span * height / span,
            ],
            [middle_span + start_p.x, start_p.y, middle_z],
            [
                middle_span + start_p.x,
                start_p.y,
                start_p.z + middle_span * height / span,
            ],
            [start_p.x + span, start_p.y, end_p.z],
        ]  # 旋转前的值
        sag_points = rotation.rotate(p_sag_points)
        sag_value = start_p.z + middle_span * height / span - middle_z
        if draw:
            msp = self._msp
            msp.add_polyline3d(sag_points)
            draw_text(msp, f'sag {sag_value}', sag_points[1])
        return sag_points

    def swing(self, angel,draw=False)->List:
        if not self._points:
            self.curve()
        points = self._points
        start_p = self._start_p
        end_p = self._end_p
        swing_rotation = transformation.Rotation(
            angel,
            [start_p.x, start_p.y, start_p.z],
            [end_p.x, end_p.y, end_p.z],
        )
        swing_point = swing_rotation.rotate(points)
        if draw:
            msp = self._msp
            msp.add_polyline3d(swing_point)
        return swing_point


class Canvas:
    def __init__(self):
        self._doc = None
        self.msp = None

    def init_canvas(self):
        doc = ezdxf.new()
        self._doc = doc
        msp = doc.modelspace()
        self.msp = msp
        doc.styles.new("TXT", dxfattribs={"font": "romans.shx"})

    def draw(self, points):
        msp = self.msp
        msp.add_polyline3d(points)

    def save(self, file_path):
        doc = self._doc
        doc.saveas(file_path)


class Ruler:
    def __init__(self, curve_points1: List, curve_points2: List):
        self._curve_points1 = curve_points1
        self._curve_points2 = curve_points2

    def closest_distance(self):
        curve_points1 = self._curve_points1
        curve_points2 = self._curve_points2
        closest = 999999999999
        closest_poc1 = 0
        closest_poc2 = 0
        for foo in range(len(curve_points1)):
            poc1 = curve_points1[foo]  # point of curve 1
            for bar in range(len(curve_points2)):
                poc2 = curve_points2[bar]
                distance = np.sum(np.power((np.array(poc1) - np.array(poc2)), 2)) ** 0.5
                if distance < closest:
                    closest_poc1 = poc1
                    closest_poc2 = poc2
                    closest = distance
        return closest, closest_poc1, closest_poc2