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// btree.rs

use pyo3::prelude::*;

/// Struct representing a node in the B-tree.
#[pyclass]
struct BTreeNode {
    /// Keys stored in the node.
    keys: Vec<i32>,
    /// Children nodes.
    children: Vec<BTreeNode>,
    /// Flag indicating if the node is a leaf node.
    is_leaf: bool,
}

#[pymethods]
impl BTreeNode {
    /// Constructor for a new B-tree node.
    #[new]
    fn new() -> Self {
        BTreeNode {
            keys: Vec::new(),
            children: Vec::new(),
            is_leaf: true,
        }
    }

    /// Checks if the node is empty.
    fn is_empty(&self) -> bool {
        self.keys.is_empty()
    }

    /// Inserts a key into the node.
    fn insert(&mut self, key: i32) {
        // Dummy implementation: Insert key into the appropriate position in the keys vector
        self.keys.push(key);
        self.keys.sort(); // Should implement proper B-tree insertion logic
    }

    /// Searches for a key in the node.
    fn search(&self, key: i32) -> bool {
        // Dummy implementation: Perform binary search in sorted keys array
        self.keys.binary_search(&key).is_ok()
    }
}

/// Struct representing a B-tree.
#[pyclass]
pub struct BTree {
    /// Root node of the B-tree.
    root: Option<BTreeNode>,
    /// Degree of the B-tree.
    degree: usize,
}

#[pymethods]
impl BTree {
    /// Constructor for a new B-tree.
    #[new]
    fn new(degree: usize) -> Self {
        BTree {
            root: None,
            degree,
        }
    }

    /// Checks if the B-tree is empty.
    fn is_empty(&self) -> bool {
        self.root.is_none()
    }

    /// Inserts a key into the B-tree.
    fn insert(&mut self, key: i32) {
        // Dummy implementation: Insert key into the B-tree
        if let Some(ref mut root) = self.root {
            // Insert into the root node
            root.insert(key);
        } else {
            // Create a new root node if none exists
            let mut new_root = BTreeNode::new();
            new_root.insert(key);
            self.root = Some(new_root);
        }
    }

    /// Searches for a key in the B-tree.
    fn search(&self, key: i32) -> bool {
        // Dummy implementation: Perform search in the B-tree
        if let Some(ref root) = self.root {
            root.search(key)
        } else {
            false
        }
    }
}