use std::time::{Duration, Instant};
use std::thread::sleep;

use log::{info, debug, trace, error};
use skulpin::LogicalSize;
use skulpin::sdl2;
use skulpin::sdl2::EventPump;
use skulpin::{RendererBuilder, PresentMode, CoordinateSystem};

use crate::bridge::{construct_keybinding_string, BRIDGE, UiCommand};
use crate::renderer::Renderer;
use crate::redraw_scheduler::REDRAW_SCHEDULER;
use crate::editor::EDITOR;
use crate::settings::SETTINGS;
use crate::INITIAL_DIMENSIONS;

#[derive(RustEmbed)]
#[folder = "assets/"]
struct Asset;

fn handle_new_grid_size(new_size: LogicalSize, renderer: &Renderer) {
    if new_size.width > 0.0 && new_size.height > 0.0 {
        let new_width = ((new_size.width + 1.0) / renderer.font_width) as i64;
        let new_height = ((new_size.height + 1.0) / renderer.font_height) as i64;
        // Add 1 here to make sure resizing doesn't change the grid size on startup
        BRIDGE.queue_command(UiCommand::Resize { width: new_width as i64, height: new_height as i64 });
    }
}

pub fn ui_loop() {
    let sdl_context = sdl2::init().expect("Failed to initialize sdl2");
    let video_subsystem = sdl_context.video().expect("Failed to create sdl video subsystem");

    let (width, height) = INITIAL_DIMENSIONS;

    let mut renderer = Renderer::new();
    let logical_size = LogicalSize::new(
        (width as f32 * renderer.font_width) as f64, 
        (height as f32 * renderer.font_height + 1.0) as f64
    );

    // let icon = {
    //     let icon_data = Asset::get("nvim.ico").expect("Failed to read icon data");
    //     let icon = load_from_memory(&icon_data).expect("Failed to parse icon data");
    //     let (width, height) = icon.dimensions();
    //     let mut rgba = Vec::with_capacity((width * height) as usize * 4);
    //     for (_, _, pixel) in icon.pixels() {
    //         rgba.extend_from_slice(&pixel.to_rgba().0);
    //     }
    //     Icon::from_rgba(rgba, width, height).expect("Failed to create icon object")
    // };
    // info!("icon created");

    let mut window = video_subsystem.window("Neovide", width, height)
            .position_centered()
            .vulkan()
            .build()
            .expect("Failed to create window");
    info!("window created");

    let mut skulpin_renderer = RendererBuilder::new()
        .prefer_integrated_gpu()
        .use_vulkan_debug_layer(true)
        .present_mode_priority(vec![PresentMode::Mailbox, PresentMode::Immediate])
        .coordinate_system(CoordinateSystem::Logical)
        .build(&window)
        .expect("Failed to create renderer");
    info!("renderer created");

    let mut mouse_down = false;
    let mut mouse_pos = (0, 0);

    // let mut allow_next_char = false;
    // let mut next_char_modifiers = ModifiersState::empty();

    let mut title = "Neovide".to_string();

    info!("Starting window event loop");
    let mut event_pump = sdl_context.event_pump().expect("Could not create sdl event pump");
    loop {
        let frame_start = Instant::now();

        let editor_title = { EDITOR.lock().title.clone() };
        if title != editor_title {
            title = editor_title;
            window.set_title(&title);
        }

        if REDRAW_SCHEDULER.should_draw() || SETTINGS.get("no_idle").read_bool() {
            debug!("Render Triggered");
            if skulpin_renderer.draw(&window, |canvas, coordinate_system_helper| {
                if renderer.draw(canvas, coordinate_system_helper) {
                    handle_new_grid_size(window.inner_size().to_logical(window.scale_factor()), &renderer)
                }
            }).is_err() {
                error!("Render failed. Closing");
                break;
            }
        }

        let elapsed = frame_start.elapsed();
        let frame_length = Duration::from_secs_f32(1.0 / 60.0);
        if elapsed < frame_length {
            sleep(frame_length - elapsed);
        }
    }

    // event_loop.run(move |event, _window_target, control_flow| {
    //     trace!("Window Event: {:?}", event);
    //     match event {
    //         Event::NewEvents(StartCause::Init) |
    //         Event::NewEvents(StartCause::ResumeTimeReached { .. }) => {
    //             window.request_redraw()
    //         },

    //         Event::WindowEvent {
    //             event: WindowEvent::CloseRequested,
    //             ..
    //         } => *control_flow = ControlFlow::Exit,

    //         Event::WindowEvent {
    //             event: WindowEvent::Resized(new_size),
    //             ..
    //         } => {
    //             handle_new_grid_size(new_size.to_logical(window.scale_factor()), &renderer)
    //         },

    //         Event::WindowEvent {
    //             event: WindowEvent::KeyboardInput {
    //                 input,
    //                 ..
    //             },
    //             ..
    //         } => {
    //             // Only interpret 'char' events when we get a previous event without a virtual
    //             // keycode (which we ignore for KeyboardInput events).
    //             // This is a hack so we don't lose a bunch of input events on Linux
    //             if input.virtual_keycode == None {
    //                 allow_next_char = true;
    //             }else {
    //                 allow_next_char = false;
    //             }
    //             next_char_modifiers = input.modifiers;

    //             if let Some(keybinding_string) = construct_keybinding_string(input)
    //                 .map(UiCommand::Keyboard) {
    //                     BRIDGE.queue_command(keybinding_string);
    //             }
    //         },

    //         Event::WindowEvent {
    //             event: WindowEvent::ReceivedCharacter(c),
    //             ..
    //         } => {
    //             if allow_next_char {
    //                 next_char_modifiers.remove(ModifiersState::SHIFT);
    //                 let keybinding = super::bridge::append_modifiers(next_char_modifiers, &c.to_string(), false);
    //                 BRIDGE.queue_command(UiCommand::Keyboard(keybinding));
    //             }
    //         },

    //         Event::WindowEvent {
    //             event: WindowEvent::CursorMoved {
    //                 position,
    //                 ..
    //             },
    //             ..
    //         } => {
    //             let position: LogicalPosition<f64> = position.to_logical(window.scale_factor());
    //             let grid_y = (position.x / renderer.font_width as f64) as i64;
    //             let grid_x = (position.y / renderer.font_height as f64) as i64;
    //             let (old_x, old_y) = mouse_pos;
    //             mouse_pos = (grid_x, grid_y);
    //             if mouse_down && (old_x != grid_x || old_y != grid_y) {
    //                 BRIDGE.queue_command(UiCommand::Drag(grid_x, grid_y));
    //             }
    //         }

    //         Event::WindowEvent {
    //             event: WindowEvent::MouseInput {
    //                 state,
    //                 ..
    //             },
    //             ..
    //         } => {
    //             let input_type = match (state, mouse_down) {
    //                 (ElementState::Pressed, false) => {
    //                     mouse_down = true;
    //                     Some("press")
    //                 },
    //                 (ElementState::Released, true) => {
    //                     mouse_down = false;
    //                     Some("release")
    //                 },
    //                 _ => None
    //             };

    //             if let Some(input_type) = input_type {
    //                 let (grid_x, grid_y) = mouse_pos;
    //                 BRIDGE.queue_command(UiCommand::MouseButton { action: input_type.to_string(), position: (grid_x, grid_y) });
    //             }
    //         }

    //         Event::WindowEvent {
    //             event: WindowEvent::MouseWheel {
    //                 delta: MouseScrollDelta::LineDelta(horizontal, vertical),
    //                 ..
    //             },
    //             ..
    //         } => {
    //             let vertical_input_type = if vertical > 0.0 {
    //                 Some("up")
    //             } else if vertical < 0.0 {
    //                 Some("down")
    //             } else {
    //                 None
    //             };

    //             if let Some(input_type) = vertical_input_type {
    //                 BRIDGE.queue_command(UiCommand::Scroll { direction: input_type.to_string(), position: mouse_pos });
    //             }

    //             let horizontal_input_type = if horizontal > 0.0 {
    //                 Some("right")
    //             } else if horizontal < 0.0 {
    //                 Some("left")
    //             } else {
    //                 None
    //             };

    //             if let Some(input_type) = horizontal_input_type {
    //                 BRIDGE.queue_command(UiCommand::Scroll { direction: input_type.to_string(), position: mouse_pos });
    //             }
    //         }

    //         Event::RedrawRequested { .. } => {

    //             *control_flow = ControlFlow::WaitUntil(frame_start + Duration::from_secs_f32(1.0 / 60.0));
    //         },

    //         _ => {}
    //     }
    // })
}