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use std::rc::Rc;
use html5ever::tendril::StrTendril;
use markup5ever_rcdom::NodeData::{Element, Text};
use markup5ever_rcdom::{Handle, Node};
use html5ever::Attribute;
use std::str::FromStr;

pub fn get_tag_name(handle: Handle) -> Option<String> {
    match handle.data {
        Element { ref name,  .. } => Some(name.local.as_ref().to_lowercase().to_string()),
        _ => None,
    }
}

pub fn get_attr<'a>(name: &str, handle: Handle) -> Option<String> {
    match handle.data {
        Element { name: _, ref attrs, .. } => attr(name, &attrs.borrow()),
        _                                  => None,
    }
}

pub fn attr(attr_name: &str, attrs: &Vec<Attribute>) -> Option<String> {
    for attr in attrs.iter() {
        if attr.name.local.as_ref() == attr_name {
            return Some(attr.value.to_string())
        }
    }
    None
}

pub fn set_attr(attr_name: &str, value: &str, handle: Handle) {
    match handle.data {
        Element { name: _, ref attrs, .. } => {
            let attrs = &mut attrs.borrow_mut();
            if let Some(index) = attrs.iter().position(|attr| {
                let name = attr.name.local.as_ref();
                name == attr_name
            }) {
                match StrTendril::from_str(value) {
                    Ok(value) => attrs[index] = Attribute {
                        name:  attrs[index].name.clone(),
                        value: value,
                    },
                    Err(_) => (),
                }
            }
        }
        _ => (),
    }
}

pub fn clean_attr(attr_name: &str, attrs: &mut Vec<Attribute>) {
    if let Some(index) = attrs.iter().position(|attr| {
        let name = attr.name.local.as_ref();
        name == attr_name
    }) {
        attrs.remove(index);
    }
}

pub fn is_empty(handle: Handle) -> bool {
    for child in handle.children.borrow().iter() {
        let c = child.clone();
        match c.data {
            Text { ref contents } => {
                if contents.borrow().trim().len() > 0 {
                    return false
                }
            },
            Element { ref name, .. } => {
                let tag_name = name.local.as_ref();
                match tag_name.to_lowercase().as_ref() {
                    "li" | "dt" | "dd" | "p" | "div" => {
                        if !is_empty(child.clone()) {
                            return false
                        }
                    },
                    _ => return false,
                }
            },
            _ => ()
        }
    }
    match get_tag_name(handle.clone()).unwrap_or_default().as_ref() {
        "li" | "dt" | "dd" | "p" | "div" | "canvas" => true,
        _ => false,
    }
}

pub fn has_link(handle: Handle) -> bool {
    if "a" == &get_tag_name(handle.clone()).unwrap_or_default() {
        return true
    }
    for child in handle.children.borrow().iter() {
        if has_link(child.clone()) {
            return true
        }
    }
    return false
}

pub fn extract_text(handle: Handle, text: &mut String, deep: bool) {
    for child in handle.children.borrow().iter() {
        let c = child.clone();
        match c.data {
            Text { ref contents } => {
                text.push_str(contents.borrow().trim());
            },
            Element { .. } => {
                if deep {
                    extract_text(child.clone(), text, deep);
                }
            },
            _ => ()
        }
    }
}

pub fn text_len(handle: Handle) -> usize {
    let mut len = 0;
    for child in handle.children.borrow().iter() {
        let c = child.clone();
        match c.data {
            Text { ref contents } => {
                len += contents.borrow().trim().chars().count();
            },
            Element { .. } => {
                len += text_len(child.clone());
            },
            _ => ()
        }
    }
    len
}

pub fn find_node(handle: Handle, tag_name: &str, nodes: &mut Vec<Rc<Node>>) {
    for child in handle.children.borrow().iter() {
        let c = child.clone();
        match c.data {
            Element { ref name, .. } => {
                let t = name.local.as_ref();
                if t.to_lowercase() == tag_name {
                    nodes.push(child.clone());
                };
                find_node(child.clone(), tag_name, nodes)
            },
            _ => ()
        }
    }
}

pub fn has_nodes(handle: Handle, tag_names: &Vec<&'static str>) -> bool {
    for child in handle.children.borrow().iter() {
        let tag_name: &str = &get_tag_name(child.clone()).unwrap_or_default();
        if tag_names.iter().any(|&n| n == tag_name) {
            return true
        }
        if match child.clone().data {
            Element { .. } => {
                has_nodes(child.clone(), tag_names)
            },
            _ => false,
        } {
            return true
        }
    }
    return false
}

pub fn text_children_count(handle: Handle) -> usize {
    let mut count = 0;
    for child in handle.children.borrow().iter() {
        let c = child.clone();
        match c.data {
            Text { ref contents } => {
                let s = contents.borrow();
                if s.trim().len() >= 20 {
                    count += 1
                }
            },
            _ => ()
        }
    }
    count
}