use acadrust::entities::Table;
use glam::Vec3;

use crate::command::EntityTransform;
use crate::entities::common::{ro_prop as ro, square_grip};
use crate::entities::traits::{Grippable, PropertyEditable, Transformable, TruckConvertible};
use crate::scene::acad_to_truck::{TruckEntity, TruckObject};
use crate::scene::object::{GripApply, GripDef, PropSection};
use crate::scene::wire_model::SnapHint;
use crate::scene::{cxf, transform};

fn v3(v: &acadrust::types::Vector3) -> Vec3 {
    Vec3::new(v.x as f32, v.y as f32, v.z as f32)
}

impl TruckConvertible for Table {
    fn to_truck(&self, _document: &acadrust::CadDocument) -> Option<TruckEntity> {
        if self.rows.is_empty() || self.columns.is_empty() {
            return None;
        }

        let origin = v3(&self.insertion_point);
        let h_raw = v3(&self.horizontal_direction);
        let h = if h_raw.length_squared() > 1e-10 { h_raw.normalize() } else { Vec3::X };
        // Perpendicular "down" direction in the drawing plane (tables grow downward)
        let v_down = Vec3::new(h.y, -h.x, 0.0);

        let col_offsets: Vec<f32> = {
            let mut off = 0.0f32;
            let mut v = vec![0.0f32];
            for col in &self.columns {
                off += col.width as f32;
                v.push(off);
            }
            v
        };
        let total_w = *col_offsets.last().unwrap_or(&0.0);

        let row_offsets: Vec<f32> = {
            let mut off = 0.0f32;
            let mut v = vec![0.0f32];
            for row in &self.rows {
                off += row.height as f32;
                v.push(off);
            }
            v
        };
        let total_h = *row_offsets.last().unwrap_or(&0.0);

        let mut pts: Vec<[f32; 3]> = Vec::new();

        let mut add_seg = |a: Vec3, b: Vec3| {
            if !pts.is_empty() {
                pts.push([f32::NAN; 3]);
            }
            pts.push([a.x, a.y, a.z]);
            pts.push([b.x, b.y, b.z]);
        };

        for &ry in &row_offsets {
            let left  = origin + h * 0.0    + v_down * ry;
            let right = origin + h * total_w + v_down * ry;
            add_seg(left, right);
        }

        for &cx in &col_offsets {
            let top    = origin + h * cx + v_down * 0.0;
            let bottom = origin + h * cx + v_down * total_h;
            add_seg(top, bottom);
        }

        // Cell text — lifted into Lines points via 2D strokes
        let text_height = 0.18_f32;
        let margin = text_height * 0.5_f32;

        for (ri, row) in self.rows.iter().enumerate() {
            let row_top = row_offsets[ri];
            let row_bot = row_offsets.get(ri + 1).copied().unwrap_or(row_top + row.height as f32);
            let row_mid = (row_top + row_bot) * 0.5;

            for (ci, cell) in row.cells.iter().enumerate() {
                let text = cell.text_value();
                if text.is_empty() {
                    continue;
                }

                let col_left  = col_offsets[ci];
                let col_width = self.columns.get(ci).map(|c| c.width as f32).unwrap_or(1.0);
                let col_right = col_left + col_width;

                // Alignment: CellStyle.alignment i32 encodes 1-9 (AutoCAD convention):
                // 1=TopLeft 2=TopCenter 3=TopRight
                // 4=MiddleLeft 5=MiddleCenter 6=MiddleRight
                // 7=BottomLeft 8=BottomCenter 9=BottomRight
                // 0/default = MiddleCenter (5)
                let align = cell.style.as_ref().map_or(5, |s| s.alignment);
                let horiz = ((align - 1).rem_euclid(3)) + 1; // 1=left, 2=center, 3=right
                let vert  = ((align - 1) / 3) + 1;           // 1=top, 2=middle, 3=bottom

                let text_w = cxf::measure_text(text, text_height, 1.0, "txt");

                let x_offset = match horiz {
                    1 => col_left + margin,                         // left
                    3 => col_right - margin - text_w,               // right
                    _ => col_left + (col_width - text_w) * 0.5,    // center (default)
                };
                let y_offset = match vert {
                    1 => row_top + margin,                          // top
                    3 => row_bot - margin - text_height,            // bottom
                    _ => row_mid - text_height * 0.5,               // middle (default)
                };

                let text_origin = origin + h * x_offset + v_down * y_offset;

                let strokes = cxf::tessellate_text_ex(
                    [text_origin.x, text_origin.y],
                    text_height,
                    0.0,
                    1.0,
                    0.0,
                    "txt",
                    text,
                );
                for stroke in strokes {
                    if !pts.is_empty() {
                        pts.push([f32::NAN; 3]);
                    }
                    for [x, y] in stroke {
                        pts.push([x, y, origin.z]);
                    }
                }
            }
        }

        Some(TruckEntity {
            object: TruckObject::Lines(pts),
            snap_pts: vec![(origin, SnapHint::Insertion)],
            tangent_geoms: vec![],
            key_vertices: vec![],
            fill_tris: vec![],
        })
    }
}

impl Grippable for Table {
    fn grips(&self) -> Vec<GripDef> {
        vec![square_grip(0, v3(&self.insertion_point))]
    }

    fn apply_grip(&mut self, grip_id: usize, apply: GripApply) {
        if grip_id == 0 {
            match apply {
                GripApply::Translate(d) => {
                    self.insertion_point.x += d.x as f64;
                    self.insertion_point.y += d.y as f64;
                    self.insertion_point.z += d.z as f64;
                }
                GripApply::Absolute(p) => {
                    self.insertion_point.x = p.x as f64;
                    self.insertion_point.y = p.y as f64;
                    self.insertion_point.z = p.z as f64;
                }
            }
        }
    }
}

impl PropertyEditable for Table {
    fn geometry_properties(&self, _text_style_names: &[String]) -> PropSection {
        PropSection {
            title: "Table".into(),
            props: vec![
                ro("Rows",    "tbl_rows",    self.rows.len().to_string()),
                ro("Columns", "tbl_cols",    self.columns.len().to_string()),
                ro("Insert X","tbl_ix",      format!("{:.4}", self.insertion_point.x)),
                ro("Insert Y","tbl_iy",      format!("{:.4}", self.insertion_point.y)),
                ro("Insert Z","tbl_iz",      format!("{:.4}", self.insertion_point.z)),
            ],
        }
    }

    fn apply_geom_prop(&mut self, _field: &str, _value: &str) {}
}

impl Transformable for Table {
    fn apply_transform(&mut self, t: &EntityTransform) {
        transform::apply_standard_entity_transform(self, t, |entity, p1, p2| {
            transform::reflect_xy_point(
                &mut entity.insertion_point.x,
                &mut entity.insertion_point.y,
                p1,
                p2,
            );
            // Reflect the horizontal direction by reflecting a tip point
            let mut tip_x = entity.insertion_point.x + entity.horizontal_direction.x;
            let mut tip_y = entity.insertion_point.y + entity.horizontal_direction.y;
            transform::reflect_xy_point(&mut tip_x, &mut tip_y, p1, p2);
            entity.horizontal_direction.x = tip_x - entity.insertion_point.x;
            entity.horizontal_direction.y = tip_y - entity.insertion_point.y;
        });
    }
}