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use std::fmt;
use crate::{Node, iterator};
use std::rc::Rc;

pub struct Tree<T> {
    /// The trees root node.
    root: Node<T>,
}

impl<T> Tree<T> {
    /// Create new tree.
    pub fn new(string: &str) -> Tree<T> {
        let mut root_node = Node::new();
        root_node.add_child(Node::new_leaf(String::from(string), None));

        Tree {
            root: root_node,
        }
    }

    /// Load a tree.
    pub fn load() -> Tree<T> {
        // TODO Implement loading a tree from syntax/format information and text
        unimplemented!()
    }

    /// Set syntax/format info for the passed range.
    /// The range is the passed start index (inclusive) to the passed end index (exclusive).
    pub fn set(&mut self, start_idx: usize, end_idx: usize, obj: T) {
        self.root.set(start_idx, end_idx, Rc::new(obj));
    }

    /// Insert a char in the underlying text.
    pub fn insert(&mut self, idx: usize, ch: char) {
        self.root.insert(idx, ch);
    }

    /// Insert a string in the underlying text.
    pub fn insert_str(&mut self, idx: usize, string: &str) {
        self.root.insert_str(idx, string);
    }

    /// Push a char to the underlying text.
    pub fn push(&mut self, ch: char) {
        self.root.push(ch);
    }

    /// Push a string to the underlying text.
    pub fn push_str(&mut self, string: &str) {
        self.root.push_str(string);
    }

    /// Get a depth first pre order iterator.
    pub fn pre_order_iter(&self) -> iterator::PreOrder<T> {
        self.root.pre_order_iter()
    }

    /// Get a leaf iterator.
    pub fn leaf_iter(&self) -> impl Iterator<Item=iterator::Item<T>> {
        self.root.leaf_iter()
    }
}

impl<T> fmt::Debug for Tree<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self.root)
    }
}

#[cfg(test)]
mod tests {
    use crate::Tree;

    #[test]
    #[should_panic]
    fn format_test_leaf_split_invalid_input_3() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(2, 1, ());
    }

    #[test]
    fn format_test_leaf_split_case_1() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(0, "Hallo Welt".len(), ());

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo Welt')
    |-- 'Hallo Welt' #
");
    }

    #[test]
    fn format_test_leaf_split_case_2() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(0, 5, ());

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo Welt')
    |-- 'Hallo' #
    |-- ' Welt'
");
    }

    #[test]
    fn format_test_leaf_split_case_3() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(6, "Hallo Welt".len(), ());

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo Welt')
    |-- 'Hallo '
    |-- 'Welt' #
");
    }

    #[test]
    fn format_test_leaf_split_case_4() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(2, 7, ());

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo Welt')
    |-- 'Ha'
    |-- 'llo W' #
    |-- 'elt'
");
    }

    #[test]
    fn format_test_complex_1() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(6, "Hallo Welt".len(), ());
        tree.set(4, 7, ());

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo Welt')
    |-- 'Hall'
    |-- 'o ' #
    |---o ('Welt') #
        |-- 'W' #
        |-- 'elt'
");
    }

    #[test]
    fn format_test_complex_2() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(6, "Hallo Welt".len(), ());
        tree.set(0, "Hallo Welt".len(), ());
        tree.set(4, 7, ());

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo Welt')
    |---o ('Hallo Welt') #
        |-- 'Hall'
        |-- 'o ' #
        |---o ('Welt') #
            |-- 'W' #
            |-- 'elt'
");
    }

    #[test]
    fn insert_str_test_complex() {
        let mut tree: Tree<()> = Tree::new("Hallo Welt");
        tree.set(6, "Hallo Welt".len(), ());
        tree.set(0, "Hallo Welt".len(), ());
        tree.set(4, 7, ());
        tree.insert_str(6, "du ");

        assert_eq!(format!("{:#?}", tree), "|---o ('Hallo du Welt')
    |---o ('Hallo du Welt') #
        |-- 'Hall'
        |-- 'o du ' #
        |---o ('Welt') #
            |-- 'W' #
            |-- 'elt'
");
    }
}