// Copyright 2024 wiiznokes
// SPDX-License-Identifier: MPL-2.0

//! A widget that displays toasts.

use std::collections::VecDeque;

use crate::widget::container;
use crate::widget::Column;
use crate::Command;
use iced_core::Element;
use widget::Toaster;

use crate::ext::CollectionWidget;

use super::column;
use super::{button, icon, row, text};

mod widget;

/// Create a new Toaster widget.
pub fn toaster<'a, Message: Clone + 'static>(
    toasts: &'a Toasts<Message>,
    content: impl Into<Element<'a, Message, crate::Theme, iced::Renderer>>,
) -> Element<'a, Message, crate::Theme, iced::Renderer> {
    let theme = crate::theme::active();
    let cosmic_theme::Spacing {
        space_xxxs,
        space_xxs,
        space_s,
        space_m,
        ..
    } = theme.cosmic().spacing;

    let make_toast = move |(id, toast): (usize, &'a Toast<Message>)| {
        let row = row()
            .push(text(&toast.message))
            .push(
                row()
                    .push_maybe(toast.action.as_ref().map(|action| {
                        button::text(&action.description).on_press((action.message)(id))
                    }))
                    .push(
                        button::icon(icon::from_name("window-close-symbolic"))
                            .on_press((toasts.on_close)(id)),
                    )
                    .align_items(iced::Alignment::Center)
                    .spacing(space_xxs),
            )
            .align_items(iced::Alignment::Center)
            .spacing(space_s);

        container(row)
            .padding([space_xxs, space_s, space_xxs, space_m])
            .style(crate::style::Container::Tooltip)
    };

    let col = toasts
        .toasts
        .iter()
        .enumerate()
        .rev()
        .map(make_toast)
        .fold(column::with_capacity(toasts.toasts.len()), Column::push)
        .spacing(space_xxxs);

    Toaster::new(col.into(), content.into(), toasts.toasts.is_empty()).into()
}

/// Duration for the [`Toast`]
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Default)]
pub enum Duration {
    #[default]
    Short,
    Long,
    Custom(std::time::Duration),
}

impl Duration {
    fn duration(&self) -> std::time::Duration {
        match self {
            Duration::Short => std::time::Duration::from_millis(5000),
            Duration::Long => std::time::Duration::from_millis(15000),
            Duration::Custom(duration) => *duration,
        }
    }
}

impl From<std::time::Duration> for Duration {
    fn from(value: std::time::Duration) -> Self {
        Self::Custom(value)
    }
}

/// Action that can be triggered by the user.
///
/// Example: `undo`
#[derive(Debug, Clone)]
pub struct Action<Message> {
    pub description: String,
    pub message: fn(usize) -> Message,
}

/// Represent the data used to display a [`Toast`]
#[derive(Debug, Clone)]
pub struct Toast<Message> {
    message: String,
    action: Option<Action<Message>>,
    duration: Duration,
}

impl<Message> Toast<Message> {
    /// Construct a new [`Toast`] with the provided message.
    pub fn new(message: impl Into<String>) -> Self {
        Self {
            message: message.into(),
            action: None,
            duration: Duration::default(),
        }
    }

    /// Set the [`Action`] of this [`Toast`]
    #[must_use]
    pub fn action(mut self, action: Action<Message>) -> Self {
        self.action.replace(action);
        self
    }

    /// Set the [`Duration`] of this [`Toast`]
    #[must_use]
    pub fn duration(mut self, duration: impl Into<Duration>) -> Self {
        self.duration = duration.into();
        self
    }
}

#[derive(Debug, Clone)]
pub struct Toasts<Message> {
    toasts: VecDeque<Toast<Message>>,
    on_close: fn(usize) -> Message,
    limit: usize,
}

impl<Message: Clone + Send + 'static> Toasts<Message> {
    pub fn new(on_close: fn(usize) -> Message) -> Self {
        Self {
            toasts: VecDeque::new(),
            on_close,
            limit: 5,
        }
    }

    /// Add a new [`Toast`]
    pub fn push(&mut self, toast: Toast<Message>) -> Command<Message> {
        while self.toasts.len() >= self.limit {
            self.toasts.pop_front();
        }

        let duration = toast.duration.duration();

        let id = self.toasts.len();
        self.toasts.push_back(toast);
        let on_close = self.on_close;

        crate::command::future(async move {
            #[cfg(feature = "tokio")]
            tokio::time::sleep(duration).await;
            on_close(id)
        })
    }

    /// Remove a [`Toast`]
    pub fn remove(&mut self, id: usize) {
        self.toasts.remove(id);
    }
}