use std::borrow::Cow;

use tui::{
    backend::Backend,
    layout::{Constraint, Rect},
    symbols::Marker,
    terminal::Frame,
};

use crate::{
    app::App,
    canvas::{drawing_utils::should_hide_x_label, Painter},
    components::time_graph::{GraphData, TimeGraph},
};

impl Painter {
    pub fn draw_memory_graph<B: Backend>(
        &self, f: &mut Frame<'_, B>, app_state: &mut App, draw_loc: Rect, widget_id: u64,
    ) {
        const Y_BOUNDS: [f64; 2] = [0.0, 100.5];
        const Y_LABELS: [Cow<'static, str>; 2] = [Cow::Borrowed("  0%"), Cow::Borrowed("100%")];

        if let Some(mem_widget_state) = app_state.states.mem_state.widget_states.get_mut(&widget_id)
        {
            let border_style = self.get_border_style(widget_id, app_state.current_widget.widget_id);
            let x_bounds = [0, mem_widget_state.current_display_time];
            let hide_x_labels = should_hide_x_label(
                app_state.app_config_fields.hide_time,
                app_state.app_config_fields.autohide_time,
                &mut mem_widget_state.autohide_timer,
                draw_loc,
            );
            let points = {
                let mut size = 1;
                if app_state.converted_data.swap_labels.is_some() {
                    size += 1; // add capacity for SWAP
                }
                #[cfg(feature = "zfs")]
                {
                    if app_state.converted_data.arc_labels.is_some() {
                        size += 1; // add capacity for ARC
                    }
                }
                #[cfg(feature = "gpu")]
                {
                    if let Some(gpu_data) = &app_state.converted_data.gpu_data {
                        size += gpu_data.len(); // add row(s) for gpu
                    }
                }

                let mut points = Vec::with_capacity(size);
                if let Some((label_percent, label_frac)) = &app_state.converted_data.mem_labels {
                    let mem_label = format!("RAM:{}{}", label_percent, label_frac);
                    points.push(GraphData {
                        points: &app_state.converted_data.mem_data,
                        style: self.colours.ram_style,
                        name: Some(mem_label.into()),
                    });
                }
                #[cfg(not(target_os = "windows"))]
                if let Some((label_percent, label_frac)) = &app_state.converted_data.cache_labels {
                    let cache_label = format!("CHE:{}{}", label_percent, label_frac);
                    points.push(GraphData {
                        points: &app_state.converted_data.cache_data,
                        style: self.colours.cache_style,
                        name: Some(cache_label.into()),
                    });
                }
                if let Some((label_percent, label_frac)) = &app_state.converted_data.swap_labels {
                    let swap_label = format!("SWP:{}{}", label_percent, label_frac);
                    points.push(GraphData {
                        points: &app_state.converted_data.swap_data,
                        style: self.colours.swap_style,
                        name: Some(swap_label.into()),
                    });
                }
                #[cfg(feature = "zfs")]
                if let Some((label_percent, label_frac)) = &app_state.converted_data.arc_labels {
                    let arc_label = format!("ARC:{}{}", label_percent, label_frac);
                    points.push(GraphData {
                        points: &app_state.converted_data.arc_data,
                        style: self.colours.arc_style,
                        name: Some(arc_label.into()),
                    });
                }
                #[cfg(feature = "gpu")]
                {
                    if let Some(gpu_data) = &app_state.converted_data.gpu_data {
                        let mut color_index = 0;
                        let gpu_styles = &self.colours.gpu_colour_styles;
                        gpu_data.iter().for_each(|gpu| {
                            let gpu_label =
                                format!("{}:{}{}", gpu.name, gpu.mem_percent, gpu.mem_total);
                            let style = {
                                if gpu_styles.is_empty() {
                                    tui::style::Style::default()
                                } else if color_index >= gpu_styles.len() {
                                    // cycle styles
                                    color_index = 1;
                                    gpu_styles[color_index - 1]
                                } else {
                                    color_index += 1;
                                    gpu_styles[color_index - 1]
                                }
                            };
                            points.push(GraphData {
                                points: gpu.points.as_slice(),
                                style,
                                name: Some(gpu_label.into()),
                            });
                        });
                    }
                }

                points
            };

            let marker = if app_state.app_config_fields.use_dot {
                Marker::Dot
            } else {
                Marker::Braille
            };

            TimeGraph {
                x_bounds,
                hide_x_labels,
                y_bounds: Y_BOUNDS,
                y_labels: &Y_LABELS,
                graph_style: self.colours.graph_style,
                border_style,
                title: " Memory ".into(),
                is_expanded: app_state.is_expanded,
                title_style: self.colours.widget_title_style,
                legend_constraints: Some((Constraint::Ratio(3, 4), Constraint::Ratio(3, 4))),
                marker,
            }
            .draw_time_graph(f, draw_loc, &points);
        }

        if app_state.should_get_widget_bounds() {
            // Update draw loc in widget map
            if let Some(widget) = app_state.widget_map.get_mut(&widget_id) {
                widget.top_left_corner = Some((draw_loc.x, draw_loc.y));
                widget.bottom_right_corner =
                    Some((draw_loc.x + draw_loc.width, draw_loc.y + draw_loc.height));
            }
        }
    }
}