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use futures::{
    channel::mpsc::{channel, Receiver, Sender},
    SinkExt, StreamExt,
};
use me3_framework::{
    overlay::{
        Align2, Context, Key, ScrollArea, TextBuffer, TextEdit, TextStyle, Ui, Vec2, Visuals,
        Window,
    },
    scripting::ScriptHost,
    FrameworkGlobal,
};
use ringbuffer::{AllocRingBuffer, RingBuffer, RingBufferExt, RingBufferWrite};

pub struct ConsoleCommandRunner {
    command_output_tx: Sender<String>,
    command_rx: Receiver<String>,
}

impl ConsoleCommandRunner {
    pub fn new(command_rx: Receiver<String>, command_output_tx: Sender<String>) -> Self {
        Self {
            command_rx,
            command_output_tx,
        }
    }

    pub async fn run(mut self) {
        let script_host = unsafe { ScriptHost::get_unchecked() };

        while let Some(command) = self.command_rx.next().await {
            log::debug!("Running command script: {}", &command);

            let result = script_host.eval(command, |result| match result {
                Ok(v) => Ok(v
                    .iter()
                    .map(|value| serde_json::to_string(value).unwrap())
                    .collect::<Vec<_>>()
                    .join("\t")),
                Err(e) => Err(me3_framework::FrameworkError::ScriptingError(e)),
            });

            match result {
                Ok(output) => {
                    let _ = self.command_output_tx.send(output).await;
                }
                Err(e) => {
                    log::error!("{}", e.to_string());
                }
            }
        }
    }
}

pub struct Console {
    lines: AllocRingBuffer<String>,
    input: String,

    /// Channel that commands are sent to for execution.
    command_tx: Sender<String>,

    /// Channel that command output is received from.
    command_output_rx: Receiver<String>,
}

impl Console {
    pub fn setup() -> (Console, ConsoleCommandRunner) {
        let (command_output_tx, command_output_rx) = channel::<String>(1024);
        let (command_tx, command_rx) = channel::<String>(1);
        let console = Console::new(command_tx, command_output_rx);
        let console_command_runner = ConsoleCommandRunner::new(command_rx, command_output_tx);

        (console, console_command_runner)
    }

    pub fn new(command_tx: Sender<String>, command_output_rx: Receiver<String>) -> Self {
        let mut lines = AllocRingBuffer::with_capacity(1024);
        lines.fill_default();

        Self {
            lines,
            input: String::default(),
            command_tx,
            command_output_rx,
        }
    }

    pub fn render(&mut self, ctx: &Context) {
        let old_visuals = Visuals::dark();
        let mut console_visuals = old_visuals.clone();

        console_visuals.widgets.noninteractive.bg_fill = old_visuals
            .widgets
            .noninteractive
            .bg_fill
            .linear_multiply(0.25);

        ctx.set_visuals(console_visuals);

        Window::new("Console")
            .resizable(true)
            .collapsible(false)
            .default_width(f32::INFINITY)
            .min_height(200.0)
            .anchor(Align2::LEFT_TOP, Vec2::ZERO)
            .title_bar(false)
            .show(ctx, |ui| self.render_ui(ui));

        ctx.set_visuals(old_visuals);
    }

    fn render_ui(&mut self, ui: &mut Ui) {
        while let Ok(Some(line)) = self.command_output_rx.try_next() {
            self.lines.push(line);
        }

        let text_style = TextStyle::Monospace;
        let row_height = ui.text_style_height(&text_style);

        ScrollArea::vertical()
            .stick_to_bottom(true)
            .always_show_scroll(true)
            .auto_shrink([false, false])
            .max_height(ui.available_height() - row_height * 2.0)
            .show_rows(ui, row_height, self.lines.len(), |ui, row_range| {
                for row in row_range {
                    let line = self.lines.get(row as isize);
                    ui.label(line.expect("invalid offset for line"));
                }
            });

        let input_response = ui.add(
            TextEdit::singleline(&mut self.input)
                .desired_width(f32::INFINITY)
                .hint_text("Enter a command"),
        );

        if input_response.lost_focus() && ui.input().key_down(Key::Enter) {
            let _ = self.command_tx.try_send(self.input.take());
        }
    }
}