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use crate::{AsClasses, Button, Divider, Icon};
use yew::html::ChildrenRenderer;
use yew::prelude::*;
use yew::virtual_dom::{VChild, VComp};

#[derive(Copy, Clone, Eq, PartialEq)]
pub enum Position {
    Left,
    Right,
}

impl Default for Position {
    fn default() -> Self {
        Self::Left
    }
}

impl AsClasses for Position {
    fn as_classes(&self) -> Classes {
        match self {
            Self::Left => Classes::new(),
            Self::Right => Classes::from(&["pf-m-right"][..]),
        }
    }
}

#[derive(Copy, Clone, Eq, PartialEq)]
pub enum Direction {
    Down,
    Up,
}

impl Default for Direction {
    fn default() -> Self {
        Self::Down
    }
}

impl AsClasses for Direction {
    fn as_classes(&self) -> Classes {
        match self {
            Self::Down => Classes::new(),
            Self::Up => Classes::from(&["pf-m-up"][..]),
        }
    }
}

#[derive(Clone, PartialEq, Properties)]
pub struct Props {
    #[prop_or_default]
    pub toggle: Option<Html>,
    #[prop_or_default]
    pub children: ChildrenRenderer<AppLauncherChildVariant>,
    #[prop_or_default]
    pub disabled: bool,
    #[prop_or_default]
    pub position: Position,
    #[prop_or_default]
    pub direction: Direction,
}

pub enum Msg {
    Toggle,
}

pub struct AppLauncher {
    props: Props,
    link: ComponentLink<Self>,

    expanded: bool,
}

impl Component for AppLauncher {
    type Message = Msg;
    type Properties = Props;

    fn create(props: Self::Properties, link: ComponentLink<Self>) -> Self {
        Self {
            expanded: false,
            props,
            link,
        }
    }

    fn update(&mut self, msg: Self::Message) -> ShouldRender {
        match msg {
            Msg::Toggle => {
                self.expanded = !self.expanded;
            }
        }
        true
    }

    fn change(&mut self, props: Self::Properties) -> ShouldRender {
        if self.props != props {
            self.props = props;
            true
        } else {
            false
        }
    }

    fn view(&self) -> Html {
        let mut classes = Classes::from("pf-c-app-launcher");

        classes = classes.extend(self.props.direction.as_classes());
        classes = classes.extend(self.props.position.as_classes());

        if self.expanded {
            classes.push("pf-m-expanded");
        }

        let onclick = self.link.callback(|_| Msg::Toggle);

        return html! {
            <nav class=classes>
                <Button
                    class="pf-c-app-launcher__toggle"
                    r#type="button"
                    disabled=self.props.disabled
                    onclick=onclick
                    >
                    { self.render_trigger() }
                </Button>
                <ul class="pf-c-app-launcher__menu" hidden=!self.expanded>
                    { for self.props.children.iter() }
                </ul>
            </nav>
        };
    }
}

impl AppLauncher {
    fn render_trigger(&self) -> Html {
        if let Some(toggle) = &self.props.toggle {
            toggle.clone()
        } else {
            Icon::Th.into()
        }
    }
}

#[derive(Clone, PartialEq)]
pub enum AppLauncherChild {
    Item(<AppLauncherItem as Component>::Properties),
    Divider(<Divider as Component>::Properties),
}

impl From<AppLauncherItemProps> for AppLauncherChild {
    fn from(props: AppLauncherItemProps) -> Self {
        AppLauncherChild::Item(props)
    }
}

impl From<()> for AppLauncherChild {
    fn from(_: ()) -> Self {
        AppLauncherChild::Divider(())
    }
}

#[derive(PartialEq, Clone)]
pub struct AppLauncherChildVariant {
    props: AppLauncherChild,
}

impl<CHILD> From<VChild<CHILD>> for AppLauncherChildVariant
where
    CHILD: Component,
    CHILD::Properties: Into<AppLauncherChild>,
{
    fn from(vchild: VChild<CHILD>) -> Self {
        Self {
            props: vchild.props.into(),
        }
    }
}

impl Into<Html> for AppLauncherChildVariant {
    fn into(self) -> Html {
        match self.props {
            AppLauncherChild::Item(props) => {
                VComp::new::<AppLauncherItem>(props, NodeRef::default(), None).into()
            }
            AppLauncherChild::Divider(props) => {
                VComp::new::<Divider>(props, NodeRef::default(), None).into()
            }
        }
    }
}

// Item

#[derive(Clone, PartialEq, Properties)]
pub struct AppLauncherItemProps {
    #[prop_or_default]
    pub children: Children,
    #[prop_or_default]
    pub href: String,
    #[prop_or_default]
    pub onclick: Option<Callback<()>>,
}

#[derive(Clone, PartialEq)]
pub struct AppLauncherItem {
    props: AppLauncherItemProps,
}

impl Component for AppLauncherItem {
    type Message = ();
    type Properties = AppLauncherItemProps;

    fn create(props: Self::Properties, _link: ComponentLink<Self>) -> Self {
        Self { props }
    }

    fn update(&mut self, _msg: Self::Message) -> ShouldRender {
        true
    }

    fn change(&mut self, props: Self::Properties) -> ShouldRender {
        if self.props != props {
            self.props = props;
            true
        } else {
            false
        }
    }

    fn view(&self) -> Html {
        let action = if let Some(onclick) = &self.props.onclick {
            html! {
                <Button
                    class="pf-c-app-launcher__menu-item"
                    onclick=onclick.clone().reform(|_|{})
                    >
                    { for self.props.children.iter() }
                </Button>
            }
        } else {
            html! {
                <a
                    class="pf-c-app-launcher__menu-item"
                    href=self.props.href.clone()>{ for self.props.children.iter() }</a>
            }
        };

        return html! {
            <li>{action}</li>
        };
    }
}

// Divider

#[derive(Clone, PartialEq, Properties)]
pub struct AppLauncherDividerProps {}

#[derive(Clone, PartialEq)]
pub struct AppLauncherDivider {
    props: AppLauncherDividerProps,
}

impl Component for AppLauncherDivider {
    type Message = ();
    type Properties = AppLauncherDividerProps;

    fn create(props: Self::Properties, _link: ComponentLink<Self>) -> Self {
        Self { props }
    }

    fn update(&mut self, _msg: Self::Message) -> ShouldRender {
        true
    }

    fn change(&mut self, props: Self::Properties) -> ShouldRender {
        if self.props != props {
            self.props = props;
            true
        } else {
            false
        }
    }

    fn view(&self) -> Html {
        return html! {<li class="pf-c-divider" role="separator"></li>};
    }
}