use super::{two_dec, FontInfo, ScaleEntity, TextEntity};
use dxf::entities::{self, AttributeDefinition};
use hex_color::HexColor;
use simple_xml_builder::XMLElement;
use unicode_segmentation::UnicodeSegmentation;
use uuid::Uuid;
use dxf::enums::AttachmentPoint;
use dxf::enums::{HorizontalTextJustification, VerticalTextJustification};

/*use parley::{
    Alignment, FontContext, FontWeight, InlineBox, Layout, LayoutContext, PositionedLayoutItem,
    StyleProperty,
};*/

use super::{HAlignment, VAlignment};

#[derive(Debug)]
pub struct DynamicText {
    text: String,
    info_name: Option<String>,
    pub x: f64,
    pub y: f64,
    z: f64,
    rotation: f64,
    uuid: Uuid,
    h_alignment: HAlignment,
    font: FontInfo,
    text_from: String,
    v_alignment: VAlignment,
    frame: bool,
    text_width: i32,
    keep_visual_rotation: bool,
    color: HexColor,
    reference_rectangle_width: f64,
    pub align_x: f64,
    pub align_y: f64,
}

impl From<&DynamicText> for XMLElement {
    fn from(txt: &DynamicText) -> Self {
        let mut dtxt_xml = XMLElement::new("dynamic_text");
        // taken from QET_ElementScaler: "ElmtDynText::AsSVGstring"
        //    // Position und Rotationspunkt berechnen:
        //    posx = x + (size/8.0)+4.05 - 0.5;
        //    posy = y + (7.0/5.0*size + 26.0/5.0) - 0.5;
        //    rotx = (-1) * (((size/8.0)+4.05) - 0.5);
        //    roty = (-1) * ((7.0/5.0*size + 26.0/5.0) - 0.5);
        //
        // reversed and slightly modified after looking at the result in element-editor:
        //
        let pt_size: f64 = txt.font.point_size;
        //
        // we need the horizontal alignment and the text-width to move to right x-position:
        // txt.reference_rectangle_width, // should be text-width (Group code 41)
        // txt.attachment_point,  // Group code 71
        //                        // 1 = Top left; 2 = Top center; 3 = Top right
        //                        // 4 = Middle left; 5 = Middle center; 6 = Middle right
        //                        // 7 = Bottom left; 8 = Bottom center; 9 = Bottom right
        //
        //
        // it's just annoying if the value for "reference_rectangle_width" in the dxf is “0.0”...
        //
        // o.k. ... as long as we do not know the real width:
        // "guess" the width by number of characters and font-size:
        //
        let graphene_count = txt.text.graphemes(true).count();

        let txt_width = if txt.reference_rectangle_width > 2.0 {
            txt.reference_rectangle_width
        } else {
            // 不同的字母，宽度与高度的比例并不相同，0.75只是一个平均值
            (graphene_count as f64) * pt_size * 0.75
        };

        println!("文本:{}", txt.text);
        println!("对齐方式：{}, {}", txt.h_alignment, txt.v_alignment);
        println!("文本宽度: {}", txt_width);
        println!("文本高度：{}", pt_size);
        println!("初始左下角位置: x={}, y={}", txt.x, txt.y);
        println!("初始对齐位置: x={}, y={}", txt.align_x, txt.align_y);
        println!("旋转角度: {}", txt.rotation);

        // 计算基础位置（不考虑旋转）
        // txt.x和txt.y现在是左下角位置
        let left_x = txt.x;
        // align_x 是对齐点的x坐标，后面加的数字是考虑到QET中boundingRect的没有完全贴合文本内容
        let mut align_x = match txt.h_alignment {
            HAlignment::Left => txt.align_x - 0.5,
            HAlignment::Center => txt.align_x - 1.0,
            HAlignment::Right => txt.align_x - 2.0
        };
        
        // 根据垂直对齐方式计算顶部的y坐标
        let top_y = match txt.v_alignment {
            VAlignment::Top => txt.y + pt_size / 2.0,
            VAlignment::Center => txt.y - pt_size / 2.0,
            VAlignment::Bottom => txt.y - pt_size + pt_size / 2.0,
        };

        // align_y 是对齐点的y坐标，后面加的数字是考虑到QET中boundingRect的没有完全贴合文本内容
        let mut align_y = match txt.v_alignment {
            VAlignment::Top => txt.align_y - 0.5,
            VAlignment::Center => txt.align_y + 0.5,
            VAlignment::Bottom => txt.align_y + 1.0
        };

        if(txt.h_alignment == HAlignment::Left && txt.v_alignment==VAlignment::Bottom) {
            align_x = txt.x-0.5;
            align_y = txt.y+1.0;
        }


        println!("左上角位置: x={}, y={}", left_x, top_y);

        let base_x = left_x;
        let base_y = top_y;

        // 如果有旋转角度，应用旋转变换
        let (x_pos, y_pos) = if txt.rotation != 0.0 {
            let rotation_rad = txt.rotation.to_radians();
            let cos_r = rotation_rad.cos();
            let sin_r = rotation_rad.sin();
            
            // 以对齐点为中心进行旋转变换
            let dx = base_x - txt.x;
            let dy = base_y - txt.y;
            
            let rotated_dx = dx * cos_r - dy * sin_r;
            let rotated_dy = dx * sin_r + dy * cos_r;
            
            (txt.x + rotated_dx, txt.y + rotated_dy)
        } else {
            (base_x, base_y)
        };

        println!("最终位置: x={}, y={}", x_pos, y_pos);


        dtxt_xml.add_attribute("x", two_dec(x_pos));
        dtxt_xml.add_attribute("y", two_dec(y_pos));
        dtxt_xml.add_attribute("z", two_dec(txt.z));
        dtxt_xml.add_attribute("rotation", two_dec(txt.rotation));
        dtxt_xml.add_attribute("uuid", format!("{{{}}}", txt.uuid));
        dtxt_xml.add_attribute("font", &txt.font);
        dtxt_xml.add_attribute("Halignment", &txt.h_alignment);
        dtxt_xml.add_attribute("Valignment", &txt.v_alignment);
        dtxt_xml.add_attribute("text_from", &txt.text_from);
        dtxt_xml.add_attribute("frame", txt.frame);
        dtxt_xml.add_attribute("text_width", txt.text_width);
        dtxt_xml.add_attribute("color", txt.color.display_rgb());
        dtxt_xml.add_attribute("align_x", two_dec(align_x));
        dtxt_xml.add_attribute("align_y", two_dec(align_y));

        //If I ever add support for other text_from types, element and composite text
        //I'll need to add more smarts here, as there may be some other children components
        //for now since it only supports user_text I'm just statically adding the single child
        //component needed
        //match txt.text_from
        let mut text_xml = XMLElement::new("text");
        text_xml.add_text(&txt.text);
        dtxt_xml.add_child(text_xml);

        // 添加颜色
        let mut color_xml = XMLElement::new("color");
        color_xml.add_text(&txt.color.display_rgb());
        dtxt_xml.add_child(color_xml);


        if let Some(i_name) = &txt.info_name {
            dtxt_xml.add_attribute("info_name", i_name);
        }

        if txt.keep_visual_rotation {
            dtxt_xml.add_attribute("keep_visual_rotation", txt.keep_visual_rotation);
        }

        dtxt_xml
    }
}

impl ScaleEntity for DynamicText {
    fn scale(&mut self, fact_x: f64, fact_y: f64) {
        self.x *= fact_x;
        self.y *= fact_y;
        self.align_x *= fact_x;
        self.align_y *= fact_y;
        //self.font.pixel_size *= fact;
        self.font.point_size *= fact_x;
    }

    fn left_bound(&self) -> f64 {
        self.x
    }

    fn right_bound(&self) -> f64 {
        //todo!()
        1.0
    }

    fn top_bound(&self) -> f64 {
        self.y
    }

    fn bot_bound(&self) -> f64 {
        //todo!()
        1.0
    }
}

pub struct DTextBuilder<'a> {
    text: TextEntity<'a>,
    color: Option<HexColor>,
}

impl<'a> DTextBuilder<'a> {
    pub fn from_text(text: &'a entities::Text) -> Self {
        Self {
            text: TextEntity::Text(text),
            color: None,
        }
    }

    pub fn from_mtext(text: &'a entities::MText) -> Self {
        Self {
            text: TextEntity::MText(text),
            color: None,
        }
    }

    pub fn from_attrib(attrib: &'a AttributeDefinition) -> Self {
        Self {
            text: TextEntity::Attrib(attrib),
            color: None,
        }
    }

    pub fn color(self, color: HexColor) -> Self {
        Self {
            color: Some(color),
            ..self
        }
    }

    pub fn build(self) -> DynamicText {
        let (
            x,
            y,
            z,
            rotation,
            style_name,
            text_height,
            value,
            h_alignment,
            v_alignment,
            reference_rectangle_width,
            align_x,
            align_y,

        ) = match self.text {
            TextEntity::Text(txt) => {
                // let (x, y) = if txt.horizontal_text_justification == HorizontalTextJustification::Left && (txt.vertical_text_justification == VerticalTextJustification::Bottom || txt.vertical_text_justification == VerticalTextJustification::Baseline) {
                //     (txt.location.x, -txt.location.y)
                // } else {
                //     (txt.second_alignment_point.x, -txt.second_alignment_point.y)
                // };
                (
                    txt.location.x,
                    -txt.location.y,
                    txt.location.z,
                    txt.rotation,
                    &txt.text_style_name,
                    txt.text_height,
                    txt.value.clone(),
                    HAlignment::from(txt.horizontal_text_justification),
                    VAlignment::from_text_entity(txt.vertical_text_justification, false),
                    0.0, // as Placeholder: no "reference_rectangle_width" with Text!!!
                    txt.second_alignment_point.x,
                    -txt.second_alignment_point.y
            )},
            TextEntity::MText(mtxt) => {
                // 计算实际的旋转角度，优先使用x_axis_direction向量
                let actual_rotation = calculate_mtext_rotation(mtxt.rotation_angle, &mtxt.x_axis_direction);
                (
                mtxt.insertion_point.x,
                -mtxt.insertion_point.y,
                mtxt.insertion_point.z,
                actual_rotation,
                &mtxt.text_style_name,
                //I'm not sure what the proper value is here for Mtext
                //becuase I haven't actually finished supporting it.
                //I'll put initial text height for now. But i'm not certain
                //exactly what this correlates to. There is also vertical_height,
                //which I would guess is the total vertical height for all the lines
                //it's possible I would need to take the vertical height and divide
                //by the number of lines to get the value I need....I'm not sure yet
                mtxt.initial_text_height,
                //There are 2 text fields on MTEXT, .text a String and .extended_text a Vec<String>
                //Most of the example files I have at the moment are single line MTEXT.
                //I edited one of them in QCad, and added a few lines. The value came through in the text field
                //with extended_text being empty, and the newlines were deliniated by '\\P'...I might need to look
                //the spec a bit to determine what it says for MTEXT, but for now, I'll just assume this is correct
                //So looking at the spec, yes '\P' is the MTEXT newline essentially. There is a bunch of MTEXT
                //inline codes that can be found at https://ezdxf.readthedocs.io/en/stable/dxfentities/mtext.html
                //The extended text is code point 3 in the dxf spec which just says: "Additional text (always in 250-character chunks) (optional)"
                //and Code point 1 the normal text value says: "Text string. If the text string is less than 250 characters, all characters appear
                //in group 1. If the text string is greater than 250 characters, the string is divided into 250-character chunks, which appear in
                //one or more group 3 codes. If group 3 codes are used, the last group is a group 1 and has fewer than 250 characters"
                {
                    let mut val = mtxt.extended_text.join("");
                    val.push_str(&mtxt.text);
                    let processed_val = val.replace("\\P", "\n");
                    super::extract_text_from_pcl(&processed_val)
                },
                HAlignment::from(mtxt.attachment_point),
                VAlignment::from(mtxt.attachment_point),
                mtxt.reference_rectangle_width,
                mtxt.insertion_point.x,
                -mtxt.insertion_point.y,
            )},
            TextEntity::Attrib(attrib) => {
                // 根据DXF文本对齐规则，当水平对齐不是Left时，使用second_alignment_point
                // let (x, y) = if attrib.horizontal_text_justification == HorizontalTextJustification::Left && (attrib.vertical_text_justification == VerticalTextJustification::Bottom || attrib.vertical_text_justification == VerticalTextJustification::Baseline) {
                //     println!("{}",111);
                //     (attrib.location.x, -attrib.location.y)
                // } else {
                //     println!("{}",222);
                //     (attrib.second_alignment_point.x, -attrib.second_alignment_point.y)
                // };
                (
                    attrib.location.x,
                    -attrib.location.y,
                    attrib.location.z,
                    attrib.rotation,
                    &attrib.text_style_name,
                    attrib.text_height,
                    attrib.text_tag.clone(),
                    HAlignment::from(attrib.horizontal_text_justification),
                    VAlignment::from_text_entity(attrib.vertical_text_justification, true),
                    0.0, // as Placeholder: not need to check if Attrib has something similar
                    attrib.second_alignment_point.x,
                    -attrib.second_alignment_point.y
                )
            },
        };

        // Create a FontContext (font database) and LayoutContext (scratch space).
        // These are both intended to be constructed rarely (perhaps even once per app):
        /*let mut font_cx = FontContext::new();
        let mut layout_cx = LayoutContext::new();

        // Create a `RangedBuilder` or a `TreeBuilder`, which are used to construct a `Layout`.
        const DISPLAY_SCALE : f32 = 1.0;
        let mut builder = layout_cx.ranged_builder(&mut font_cx, &value, DISPLAY_SCALE);

        // Set default styles that apply to the entire layout
        builder.push_default(StyleProperty::LineHeight(1.3));
        builder.push_default(StyleProperty::FontSize((text_height * self.txt_sc_factor.unwrap()).round() as f32));

        // Build the builder into a Layout
        let mut layout: Layout<()> = builder.build(&value);

        // Run line-breaking and alignment on the Layout
        const MAX_WIDTH : Option<f32> = Some(1000.0);
        layout.break_all_lines(MAX_WIDTH);
        layout.align(MAX_WIDTH, Alignment::Start);

        let calc_width = layout.width();
        let calc_height = layout.height();
        dbg!(&value);
        dbg!(calc_width);
        dbg!(calc_height);*/

        /*dbg!(&value);
        dbg!(&y);
        dbg!(&self.text);*/
        DynamicText {
            //x: x - (calc_width as f64/2.0),
            x,
            y,
            z,
            rotation: if rotation.abs().round() as i64 % 360 != 0 {
                rotation - 180.0
            } else {
                0.0
            },
            uuid: Uuid::new_v4(),
            font: if style_name == "STANDARD" {
                FontInfo {
                    point_size: text_height,
                    ..Default::default()
                }
            } else {
                //clearly right now this is exactly the same as the main body of the if block
                //I'm jus putting this in for now, to compile while I get the font handling
                //working correctly
                FontInfo {
                    point_size: text_height,
                    ..Default::default()
                }
            },
            reference_rectangle_width, //liest aus der dxf-Datei!!!
            h_alignment,
            v_alignment,
            text_from: "UserText".into(),
            frame: false,
            text_width: -1,
            color: self.color.unwrap_or(HexColor::BLACK),

            text: value,
            keep_visual_rotation: false,
            info_name: None,
            align_x,
            align_y,

        }
    }
}


/// 计算MText的实际旋转角度
///
/// # Arguments
/// * `rotation_angle` - DXF中的rotation_angle字段（编号50）
/// * `x_axis_direction` - DXF中的x_axis_direction向量（编号11,21,31）
///
/// # Returns
/// 返回实际的旋转角度（弧度）
fn calculate_mtext_rotation(rotation_angle: f64, x_axis_direction: &dxf::Vector) -> f64 {
    // 检查x_axis_direction是否为默认值(1.0, 0.0, 0.0)
    let default_x_axis = (x_axis_direction.x - 1.0).abs() < 1e-10 
        && x_axis_direction.y.abs() < 1e-10 
        && x_axis_direction.z.abs() < 1e-10;
    
    if default_x_axis {
        // 如果x_axis_direction是默认值，使用rotation_angle
        rotation_angle
    } else {
        // 如果x_axis_direction不是默认值，从向量计算角度
        // atan2返回弧度值，需要转换为度数
        let angle_radians = x_axis_direction.y.atan2(x_axis_direction.x);
        // 将弧度转换为度数，这里rotation字段期望度数
        angle_radians * 180.0 / std::f64::consts::PI
    }
}

/// 将MText的对齐点坐标调整为左下角坐标
/// 
/// # 参数
/// * `x` - MText的insertion_point.x（对齐点X坐标）
/// * `y` - MText的insertion_point.y（对齐点Y坐标）
/// * `attachment_point` - MText的对齐方式
/// * `text_height` - 文本高度
/// * `text_width` - 文本宽度（reference_rectangle_width）
/// 
/// # 返回值
/// 返回调整后的(x, y)坐标，对应文本的左下角位置
pub fn adjust_mtext_coordinates(
    x: f64,
    y: f64,
    attachment_point: AttachmentPoint,
    text_height: f64,
    text_width: f64,
) -> (f64, f64) {
    let mut adjusted_x = x;
    let mut adjusted_y = y;
    
    // 根据水平对齐方式调整X坐标
    match attachment_point {
        // 左对齐：无需调整X坐标
        AttachmentPoint::TopLeft | AttachmentPoint::MiddleLeft | AttachmentPoint::BottomLeft => {
            // X坐标已经是左边界，无需调整
        }
        // 中心对齐：向左偏移文本宽度的一半
        AttachmentPoint::TopCenter | AttachmentPoint::MiddleCenter | AttachmentPoint::BottomCenter => {
            adjusted_x -= text_width / 2.0; // 如果文本旋转了，那就不是这么算了
        }
        // 右对齐：向左偏移整个文本宽度
        AttachmentPoint::TopRight | AttachmentPoint::MiddleRight | AttachmentPoint::BottomRight => {
            adjusted_x -= text_width;
        }
    }
    
    // 根据垂直对齐方式调整Y坐标
    match attachment_point {
        // 底部对齐：无需调整Y坐标（已经是底边界）
        AttachmentPoint::BottomLeft | AttachmentPoint::BottomCenter | AttachmentPoint::BottomRight => {
            // Y坐标已经是底边界，无需调整
        }
        // 中心对齐：向下偏移文本高度的一半
        AttachmentPoint::MiddleLeft | AttachmentPoint::MiddleCenter | AttachmentPoint::MiddleRight => {
            adjusted_y -= text_height / 2.0;
        }
        // 顶部对齐：向下偏移整个文本高度
        AttachmentPoint::TopLeft | AttachmentPoint::TopCenter | AttachmentPoint::TopRight => {
            adjusted_y -= text_height;
        }
    }
    
    (adjusted_x, adjusted_y)
}