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use alloc::string::{ToString, String};
use alloc::vec::Vec;

use core::fmt::{self, Debug};

use serde_json::{Value, Map};

use super::{Events, value_to_string_take};


pub enum View {
    Text(String),
    Data {
        kind: String,
        key: Option<String>,
        props: Map<String, Value>,
        events: Events,
        children: Vec<View>,
    }
}

impl Debug for View {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            &View::Text(ref string) => write!(f, "Text({})", string),
            &View::Data {ref kind, ref key, ref props, ref events, ref children} => {
                f.debug_struct("Data")
                    .field("kind", kind)
                    .field("key", key)
                    .field("props", props)
                    .field("events", events)
                    .field("children", children)
                    .finish()
            },
        }
    }
}

impl Clone for View {
    #[inline]
    fn clone(&self) -> Self {
        match self {
            &View::Text(ref string) => View::Text(string.clone()),
            &View::Data {ref kind, ref key, ref props, ref children, ..} => View::Data {
                kind: kind.clone(),
                key: key.clone(),
                props: props.clone(),
                events: Events::new(),
                children: children.clone(),
            },
        }
    }
}

impl PartialEq for View {
    #[inline]
    fn eq(&self, other: &View) -> bool {
        match self {
            &View::Text(ref lhs_string) => match other {
                &View::Text(ref rhs_string) => lhs_string == rhs_string,
                &View::Data { .. } => false,
            },
            &View::Data {
                kind: ref lhs_kind,
                key: ref lhs_key,
                props: ref lhs_props,
                events: ref lhs_events,
                children: ref lhs_children, ..
            } => match self {
                &View::Text(_) => false,
                &View::Data {
                    kind: ref rhs_kind,
                    key: ref rhs_key,
                    props: ref rhs_props,
                    events: ref rhs_events,
                    children: ref rhs_children,
                } => {
                    lhs_kind == rhs_kind &&
                    lhs_key == rhs_key &&
                    lhs_props == rhs_props &&
                    lhs_events == rhs_events &&
                    lhs_children == rhs_children
                },
            },
        }
    }
}

impl View {

    #[inline]
    pub fn new(kind: &str, mut props: Map<String, Value>, events: Events, children: Vec<View>) -> Self {
        let key = props.remove("key").map(value_to_string_take);

        View::Data {
            kind: kind.into(),
            key: key,
            props: props,
            events: events,
            children: children,
        }
    }

    #[inline]
    pub fn new_text(text: &str) -> Self {
        View::Text(text.into())
    }
    #[inline]
    pub fn new_data(kind: &str) -> Self {
        View::Data {
            kind: kind.into(),
            key: None,
            props: Map::new(),
            events: Events::new(),
            children: Vec::new(),
        }
    }

    #[inline]
    pub fn kind(&self) -> Option<&String> {
        match self {
            &View::Text(_) => None,
            &View::Data { ref kind, .. } => Some(kind),
        }
    }

    #[inline]
    pub fn key(&self) -> Option<&String> {
        match self {
            &View::Text(_) => None,
            &View::Data { ref key, .. } => key.as_ref(),
        }
    }
    #[inline]
    pub fn key_mut(&mut self) -> Option<&mut String> {
        match self {
            &mut View::Text(_) => None,
            &mut View::Data { ref mut key, .. } => key.as_mut(),
        }
    }
    #[inline]
    pub fn set_key(&mut self, new_key: String) {
        match self {
            &mut View::Text(_) => (),
            &mut View::Data { ref mut key, .. } => *key = Some(new_key),
        }
    }

    #[inline]
    pub fn props(&self) -> Option<&Map<String, Value>> {
        match self {
            &View::Text(_) => None,
            &View::Data { ref props, .. } => Some(props),
        }
    }
    #[inline]
    pub fn props_mut(&mut self) -> Option<&mut Map<String, Value>> {
        match self {
            &mut View::Text(_) => None,
            &mut View::Data { ref mut props, .. } => Some(props),
        }
    }

    #[inline]
    pub fn events(&self) -> Option<&Events> {
        match self {
            &View::Text(_) => None,
            &View::Data { ref events, .. } => Some(events),
        }
    }
    #[inline]
    pub fn events_mut(&mut self) -> Option<&mut Events> {
        match self {
            &mut View::Text(_) => None,
            &mut View::Data { ref mut events, .. } => Some(events),
        }
    }

    #[inline]
    pub fn children(&self) -> Option<&Vec<View>> {
        match self {
            &View::Text(_) => None,
            &View::Data { ref children, .. } => Some(children),
        }
    }
    #[inline]
    pub fn children_mut(&mut self) -> Option<&mut Vec<View>> {
        match self {
            &mut View::Text(_) => None,
            &mut View::Data { ref mut children, .. } => Some(children),
        }
    }
}

impl<T> From<T> for View
    where T: ToString,
{
    #[inline]
    fn from(value: T) -> Self {
        View::Text(value.to_string())
    }
}