You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lee_breadth_first_search.rs
    path of file: ./repos/Rust/src/graph
    
    the code of the file until where you have to start completion: use std::collections::VecDeque;

// All four potential movements from a cell are listed here.

fn validate(matrix: &[Vec<i32>], visited: &[Vec<bool>], row: isize, col: isize) -> bool {
    // Check if it is possible to move to the position (row, col) from the current cell.
    let (row, col) = (row as usize, col as usize);
    row < matrix.len() && col < matrix[0].len() && matrix[row][col] == 1 && !visited[row][col]
}

pub fn lee(matrix: Vec<Vec<i32>>, source: (usize, usize), destination: (usize, usize)) -> isize {
    const ROW: [isize; 4] = [-1, 0, 0, 1];
    const COL: [isize; 4] = [0, -1, 1, 0];
    let (i, j) = 
    
pub fn lee(matrix: Vec<Vec<i32>>, source: (usize, usize), destination: (usize, usize)) -> isize {
    const ROW: [isize; 4] = [-1, 0, 0, 1];
    const COL: [isize; 4] = [0, -1, 1, 0];
    let (i, j) = source;
    let (x, y) = destination;

    // Base case: invalid input
    if matrix.is_empty() || matrix[i][j] == 0 || matrix[x][y] == 0 {
        return -1;
    }

    let (m, n) = (matrix.len(), matrix[0].len());
    let mut visited = vec![vec![false; n]; m];
    let mut q = VecDeque::new();
    visited[i][j] = true;
    q.push_back((i, j, 0));
    let mut min_dist = isize::MAX;

    // Loop until the queue is empty
    while let Some((i, j, dist)) = q.pop_front() {
        if i == x && j == y {
            // If the destination is found, update `min_dist` and stop
            min_dist = dist;
            break;
        }

        // Check for all four possible movements from the current cell
        for k in 0..ROW.len() {
            let row = i as isize + ROW[k];
            let col = j as isize + COL[k];
            if validate(&matrix, &visited, row, col) {
                // Mark the next cell as visited and enqueue it
                let (row, col) = (row as usize, col as usize);
                visited[row][col] = true;
                q.push_back((row, col, dist + 1));
            }
        }
    }

    if min_dist != isize::MAX {
        min_dist
    } else {
        -1
    }
}