use std::borrow::Cow;
use std::path::PathBuf;

use dioxus_core::prelude::Component;
use tao::window::{Icon, WindowBuilder, WindowId};
use wry::{
    http::{Request as HttpRequest, Response as HttpResponse},
    FileDropEvent,
};

/// The behaviour of the application when the last window is closed.
#[derive(Copy, Clone, Eq, PartialEq)]
pub enum WindowCloseBehaviour {
    /// Default behaviour, closing the last window exits the app
    LastWindowExitsApp,
    /// Closing the last window will not actually close it, just hide it
    LastWindowHides,
    /// Closing the last window will close it but the app will keep running so that new windows can be opened
    CloseWindow,
}

/// The configuration for the desktop application.
pub struct Config {
    pub(crate) window: WindowBuilder,
    pub(crate) file_drop_handler: Option<DropHandler>,
    pub(crate) protocols: Vec<WryProtocol>,
    pub(crate) pre_rendered: Option<String>,
    pub(crate) disable_context_menu: bool,
    pub(crate) resource_dir: Option<PathBuf>,
    pub(crate) data_dir: Option<PathBuf>,
    pub(crate) custom_head: Option<String>,
    pub(crate) custom_index: Option<String>,
    pub(crate) root_name: String,
    pub(crate) background_color: Option<(u8, u8, u8, u8)>,
    pub(crate) last_window_close_behaviour: WindowCloseBehaviour,
    pub(crate) enable_default_menu_bar: bool,
}

type DropHandler = Box<dyn Fn(WindowId, FileDropEvent) -> bool>;

pub(crate) type WryProtocol = (
    String,
    Box<dyn Fn(HttpRequest<Vec<u8>>) -> HttpResponse<Cow<'static, [u8]>> + 'static>,
);

impl Config {
    /// Initializes a new `WindowBuilder` with default values.
    #[inline]
    pub fn new() -> Self {
        let window = WindowBuilder::new().with_title(
            dioxus_cli_config::CURRENT_CONFIG
                .as_ref()
                .map(|c| c.dioxus_config.application.name.clone())
                .unwrap_or("Dioxus App".to_string()),
        );

        Self {
            // event_handler: None,
            window,
            protocols: Vec::new(),
            file_drop_handler: None,
            pre_rendered: None,
            disable_context_menu: !cfg!(debug_assertions),
            resource_dir: None,
            data_dir: None,
            custom_head: None,
            custom_index: None,
            root_name: "main".to_string(),
            background_color: None,
            last_window_close_behaviour: WindowCloseBehaviour::LastWindowExitsApp,
            enable_default_menu_bar: true,
        }
    }

    /// Launch a Dioxus app using the given component and config
    ///
    /// See the [`crate::launch::launch`] function for more details.
    pub fn launch(self, root: Component<()>) {
        crate::launch::launch_cfg(root, self)
    }

    /// Launch a Dioxus app using the given component, config, and props
    ///
    /// See the [`crate::launch::launch_with_props`] function for more details.
    pub fn launch_with_props<P: 'static + Clone>(self, root: Component<P>, props: P) {
        crate::launch::launch_with_props(root, props, self)
    }

    /// Set whether the default menu bar should be enabled.
    ///
    /// > Note: `enable` is `true` by default. To disable the default menu bar pass `false`.
    pub fn with_default_menu_bar(mut self, enable: bool) -> Self {
        self.enable_default_menu_bar = enable;
        self
    }

    /// set the directory from which assets will be searched in release mode
    pub fn with_resource_directory(mut self, path: impl Into<PathBuf>) -> Self {
        self.resource_dir = Some(path.into());
        self
    }

    /// set the directory where data will be stored in release mode.
    ///
    /// > Note: This **must** be set when bundling on Windows.
    pub fn with_data_directory(mut self, path: impl Into<PathBuf>) -> Self {
        self.data_dir = Some(path.into());
        self
    }

    /// Set whether or not the right-click context menu should be disabled.
    pub fn with_disable_context_menu(mut self, disable: bool) -> Self {
        self.disable_context_menu = disable;
        self
    }

    /// Set the pre-rendered HTML content
    pub fn with_prerendered(mut self, content: String) -> Self {
        self.pre_rendered = Some(content);
        self
    }

    /// Set the configuration for the window.
    pub fn with_window(mut self, window: WindowBuilder) -> Self {
        // gots to do a swap because the window builder only takes itself as muy self
        // I wish more people knew about returning &mut Self
        self.window = window;
        self
    }

    /// Sets the behaviour of the application when the last window is closed.
    pub fn with_close_behaviour(mut self, behaviour: WindowCloseBehaviour) -> Self {
        self.last_window_close_behaviour = behaviour;
        self
    }

    /// Set a file drop handler. If this is enabled, html drag events will be disabled.
    pub fn with_file_drop_handler(
        mut self,
        handler: impl Fn(WindowId, FileDropEvent) -> bool + 'static,
    ) -> Self {
        self.file_drop_handler = Some(Box::new(handler));
        self
    }

    /// Set a custom protocol
    pub fn with_custom_protocol<F>(mut self, name: String, handler: F) -> Self
    where
        F: Fn(HttpRequest<Vec<u8>>) -> HttpResponse<Cow<'static, [u8]>> + 'static,
    {
        self.protocols.push((name, Box::new(handler)));
        self
    }

    /// Set a custom icon for this application
    pub fn with_icon(mut self, icon: Icon) -> Self {
        self.window.window.window_icon = Some(icon);
        self
    }

    /// Inject additional content into the document's HEAD.
    ///
    /// This is useful for loading CSS libraries, JS libraries, etc.
    pub fn with_custom_head(mut self, head: String) -> Self {
        self.custom_head = Some(head);
        self
    }

    /// Use a custom index.html instead of the default Dioxus one.
    ///
    /// Make sure your index.html is valid HTML.
    ///
    /// Dioxus injects some loader code into the closing body tag. Your document
    /// must include a body element!
    pub fn with_custom_index(mut self, index: String) -> Self {
        self.custom_index = Some(index);
        self
    }

    /// Set the name of the element that Dioxus will use as the root.
    ///
    /// This is akint to calling React.render() on the element with the specified name.
    pub fn with_root_name(mut self, name: impl Into<String>) -> Self {
        self.root_name = name.into();
        self
    }

    /// Sets the background color of the WebView.
    /// This will be set before the HTML is rendered and can be used to prevent flashing when the page loads.
    /// Accepts a color in RGBA format
    pub fn with_background_color(mut self, color: (u8, u8, u8, u8)) -> Self {
        self.background_color = Some(color);
        self
    }
}

impl Default for Config {
    fn default() -> Self {
        Self::new()
    }
}

// dirty trick, avoid introducing `image` at runtime
// TODO: use serde when `Icon` impl serde
//
// This function should only be enabled when generating new icons.
//
// #[test]
// #[ignore]
// fn prepare_default_icon() {
//     use image::io::Reader as ImageReader;
//     use image::ImageFormat;
//     use std::fs::File;
//     use std::io::Cursor;
//     use std::io::Write;
//     use std::path::PathBuf;
//     let png: &[u8] = include_bytes!("default_icon.png");
//     let mut reader = ImageReader::new(Cursor::new(png));
//     reader.set_format(ImageFormat::Png);
//     let icon = reader.decode().unwrap();
//     let bin = PathBuf::from(file!())
//         .parent()
//         .unwrap()
//         .join("default_icon.bin");
//     println!("{:?}", bin);
//     let mut file = File::create(bin).unwrap();
//     file.write_all(icon.as_bytes()).unwrap();
//     println!("({}, {})", icon.width(), icon.height())
// }