/*
 * trainer.js
 *
 * Computer Science 50, Fall 2011
 * section9
 *
 * Lets you train dolphins.
 */

/*
 * void
 * draw_ocean()
 *
 * Draws the ocean.
 */

function draw_ocean()
{
    // start HTML string
    var html = "<col width=200><col width=200><col width=200><col width=200><tr>";
    
    // store pictures of dolphins in the ocean in HTML string
    for (var i = 0; i < ocean_array.length; i++)
    {
        if (ocean_array[i] == null)
            html += "<td></td>";
        else
            html += "<td><img src='" + ocean_array[i].picture + "' alt='Dolphin' width='200' height='100'></td>";
    }
    
    // continue HTML string
    html += "<tr></tr>";
    
    // store names of all dolphins in HTML string
    for (var dolphin in DOLPHINS)
        html += "<td>" + dolphin + "</td>";
    
    // end HTML string
    html += "</tr>";
    
    // print out HTML string
    document.getElementById("ocean_table").innerHTML = html;
    
    return;
}

/*
 * void
 * draw_pool()
 *
 * Draws the pool.
 */

function draw_pool()
{
    // start HTML string
    var html = "";
    
    // check if a dolphin is in the pool
    if (pool != null)
    {
        html += "<p>Now Training<p>";
        html += "Name: " + pool.name + "<br>";
        html += "Type: " + pool.type + "<br>";
        html += "Genus: " + pool.genus + "<br>";
        html += "Length: " + pool.length + " feet<br>";
        html += "Weight: " + pool.weight + " pounds<br>";
    }

    // print out HTML string
    document.getElementById("pool").innerHTML = html;
    
    return;
}

/*
 * void
 * load()
 *
 * Loads the web page.
 */

function load() 
{
    /*
     * put the dolphins into the ocean array
     * 1) create an empty array
     * 2) use a for-in loop
     * on the first iteration of the loop, here is what each variable will equal
     * dolphin == "Omar"
     * DOLPHINS[dolphin] == DOLPHINS["Omar"] == {name: "Omar", type:...}
     */
    ocean_array = [];
    for (var dolphin in DOLPHINS)
        ocean_array.push(DOLPHINS[dolphin]);

    // no dolphins are in the pool to begin
    pool = null;

    // draw the ocean and the pool
    draw_ocean();
    draw_pool();
    
    return;
}

/*
 * void
 * train()
 *
 * Moves a dolphin from the ocean to the pool.
 */

function train()
{
    // only one dolphin can be trained at a time
    if (pool != null)
    {
        alert("You're already training a dolphin!");
        return;
    }

    // ask the trainer to pick a dolphin
    var name = prompt("Pick a dolphin to train:", "");
    
    // remove chosen dolphin from the ocean and put in the pool
    for (var i = 0; i < ocean_array.length; i++)
    {
        if (name == ocean_array[i].name)
        {
            pool = ocean_array[i];
            
            // why set the spot to null rather than write "ocean_array.splice(i, 1);"?
            ocean_array[i] = null;
        }
    }
    
    // if now training a dolphin
    if (pool != null)
    {
        // draw the ocean and the pool
        draw_ocean();
        draw_pool();
    }
    
    // if not now training
    else
       alert("Please enter an actual dolphin name.");

    return;
}

/*
 * void
 * set_free()
 *
 * Moves a dolphin from the pool to the ocean.
 */

function set_free()
{
    // can't free a dolphin if not training one
    if (pool == null)
    {
        alert("You're not training a dolphin!");
        return;
    }
    
    // remove the dolphin from the pool and put in the ocean
    for (var i = 0; i < ocean_array.length; i++)
    {
        if (ocean_array[i] == null)
        {   
            ocean_array[i] = pool;
            pool = null;
        }
    }
    
    // draw the ocean and the pool
    draw_ocean();
    draw_pool();

    return;
}