use crate::{builder::validator::multi_line_labelinfo::MultiLineLabelInfo, prelude::*};

use std::sync::{
    atomic::{AtomicU32, Ordering::SeqCst},
    Arc, Mutex,
};

use anyhow::Result;
use utilities::prelude::*;

pub struct MultiLineLabelBuilder {
    text_alignment: TextAlignment,
    text_ratio: f32,
    text_color: Color,
    text: Option<String>,

    line_count: u32,

    background: Option<FillTypeInfo>,
}

impl MultiLineLabelBuilder {
    pub fn set_text(mut self, text: impl Into<String>) -> Self {
        self.text = Some(text.into());

        self
    }

    pub fn set_ratio(mut self, ratio: f32) -> Self {
        self.text_ratio = ratio;

        self
    }

    pub fn set_text_color(mut self, text_color: impl Into<Color>) -> Self {
        self.text_color = text_color.into();

        self
    }

    pub fn set_text_alignment(mut self, text_alignment: TextAlignment) -> Self {
        self.text_alignment = text_alignment;

        self
    }

    pub fn set_line_count(mut self, line_count: u32) -> Self {
        self.line_count = line_count;

        self
    }

    pub fn set_background(mut self, background: impl Into<FillTypeInfo>) -> Self {
        self.background = Some(background.into());

        self
    }

    pub fn build(self, gui_handler: Arc<GuiHandler>) -> Result<Arc<MultiLineLabel>> {
        let base_grid = Grid::new(gui_handler.clone(), 1, self.line_count as usize, false)?;
        base_grid.set_margin(0);
        base_grid.set_padding(0);

        if let Some(background) = self.background {
            base_grid.set_background(background)?;
        }

        for i in 0..self.line_count {
            let label = Label::builder()
                .set_ratio(self.text_ratio)
                .set_text_color(self.text_color)
                .set_text_alignment(self.text_alignment)
                .build(gui_handler.clone())?;

            base_grid.attach(label, 0, i as usize, 1, 1)?;
        }

        Ok(Arc::new(MultiLineLabel {
            grid: base_grid,

            characters_per_line: AtomicU32::new(0),
            text: Mutex::new(self.text.unwrap_or_default()),
            splits: Mutex::new(Vec::new()),
        }))
    }
}

pub struct MultiLineLabel {
    grid: Arc<Grid>,

    characters_per_line: AtomicU32,
    text: Mutex<String>,
    splits: Mutex<Vec<String>>,
}

impl MultiLineLabel {
    pub fn builder() -> MultiLineLabelBuilder {
        MultiLineLabelBuilder {
            text_alignment: TextAlignment::Center,
            text_ratio: 0.7,
            text_color: Color::Black,
            text: None,

            line_count: 1,

            background: None,
        }
    }

    pub fn set_text(&self, text: impl ToString) -> Result<()> {
        *self.text.lock().unwrap() = text.to_string();

        self.update_text()
    }

    fn update_text(&self) -> Result<()> {
        let text = self.text.lock().unwrap();
        let splits = text.split(' ');
        let character_count = self.characters_per_line.load(SeqCst) as usize;

        let mut current_line = String::new();
        let mut lines = Vec::new();

        for split in splits {
            let current_len = current_line.len();
            let next_len = split.len() + 1;

            if (current_len + next_len) <= character_count {
                if current_line.is_empty() {
                    current_line = split.to_string();
                } else {
                    current_line += &format!(" {}", split);
                }
            } else {
                lines.push(current_line);
                current_line = split.to_string();
            }
        }

        if !current_line.is_empty() {
            lines.push(current_line);
        }

        *self.splits.lock().unwrap() = lines.clone();

        self.iter_label(|label, y| {
            if y < lines.len() {
                label.set_text(&lines[y])?;
            } else {
                label.set_text("")?;
            }

            Ok(())
        })
    }

    pub fn text(&self) -> String {
        self.text.lock().unwrap().clone()
    }

    pub fn set_text_color(&self, text_color: Color) -> Result<()> {
        self.iter_label(|label, _| label.set_text_color(text_color))
    }

    pub fn set_alignment(&self, alignment: TextAlignment) -> Result<()> {
        self.iter_label(|label, _| label.set_alignment(alignment))
    }

    pub fn set_text_ratio(&self, ratio: f32) -> Result<()> {
        self.iter_label(|label, _| label.set_text_ratio(ratio))
    }

    pub fn set_background(&self, background: impl Into<FillTypeInfo>) -> Result<()> {
        self.grid.set_background(background)
    }

    pub fn try_from(
        multi_line_label_info: &MultiLineLabelInfo,
        gui_handler: &Arc<GuiHandler>,
    ) -> Result<Arc<Self>> {
        let text = multi_line_label_info.text.read().unwrap().clone();
        let color = multi_line_label_info.text_color;

        let mut multi_line_label_builder = MultiLineLabel::builder()
            .set_text_color(color)
            .set_text_alignment(multi_line_label_info.text_alignment)
            .set_line_count(multi_line_label_info.line_count.get()?);

        if let Some(background_type) = &multi_line_label_info.background_type {
            multi_line_label_builder =
                multi_line_label_builder.set_background(background_type.clone());
        }

        if let Some(ratio) = multi_line_label_info.text_ratio {
            multi_line_label_builder = multi_line_label_builder.set_ratio(ratio);
        }

        if !text.is_empty() {
            multi_line_label_builder = multi_line_label_builder.set_text(text);
        }

        multi_line_label_builder.build(gui_handler.clone())
    }

    fn iter_label<F>(&self, f: F) -> Result<()>
    where
        F: Fn(&Label, usize) -> Result<()>,
    {
        for y in 0..self.grid.dimensions().1 {
            let child = self.grid.child_at(0, y)?.unwrap();
            let gui_element = child.downcast().unwrap();
            let label = gui_element.label().unwrap();

            f(label, y)?;
        }

        Ok(())
    }
}

impl GuiElementTraits for MultiLineLabel {
    fn gridable(&self) -> Option<&dyn Gridable> {
        Some(self)
    }

    fn visibility(&self) -> Option<&dyn Visibility> {
        Some(self)
    }

    fn downcast<'a>(&'a self) -> Option<GuiElement<'a>> {
        Some(GuiElement::MultiLineLabel(self))
    }
}

impl Visibility for MultiLineLabel {
    fn visible(&self) -> bool {
        self.grid.visible()
    }

    fn set_visibility(&self, visibility: bool) -> Result<()> {
        self.grid.set_visibility(visibility)
    }
}

impl Gridable for MultiLineLabel {
    fn set_frame(
        &self,
        x: i32,
        y: i32,
        w: u32,
        h: u32,
        vert_align: VerticalAlign,
        hori_align: HorizontalAlign,
    ) -> Result<()> {
        self.grid.set_frame(x, y, w, h, vert_align, hori_align)?;

        if let Some(child) = self.grid.child_at(0, 0)? {
            let gui_element = child.downcast().unwrap();
            let label = gui_element.label().unwrap();

            let left = label.framable.left();
            let right = label.framable.right();
            let top = label.framable.top();
            let bottom = label.framable.bottom();

            let width = right - left;
            let height = bottom - top;

            let text_ratio = label.text_ratio();

            let text_size = height as f32 * text_ratio;
            let max_letter_count = (width as f32 / (text_size / 2.0)).floor();

            self.characters_per_line
                .store(max_letter_count as u32, SeqCst);

            self.update_text()?;
        }

        Ok(())
    }

    fn selectable(&self) -> Option<&Arc<Selectable>> {
        None
    }

    fn type_name(&self) -> &str {
        "MultiLineLabel"
    }

    fn set_layer(&self, layer: i32) -> Result<()> {
        self.grid.set_layer(layer)
    }
}