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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">BTreeSet</span>, <span class="ident">HashMap</span>};

<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">deserialize_multimap</span>, <span class="ident">serialize_multimap</span>, <span class="ident">MultiMap</span>, <span class="ident">Timer</span>};
<span class="kw">use</span> <span class="ident">map_model</span>::<span class="ident">BuildingID</span>;
<span class="kw">use</span> <span class="ident">widgetry</span>::{<span class="ident">Color</span>, <span class="ident">EventCtx</span>};

<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">levels</span>::<span class="ident">Level</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">music</span>::<span class="ident">Music</span>;

<span class="doccomment">/// Persistent state that lasts across levels.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Session</span> {
    <span class="kw">pub</span> <span class="ident">levels</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Level</span><span class="op">&gt;</span>,
    <span class="doccomment">/// Enable this to use the levels, instead of overwriting them with the version in the code.</span>
    <span class="kw">pub</span> <span class="ident">enable_modding</span>: <span class="ident">bool</span>,
    <span class="kw">pub</span> <span class="ident">colors</span>: <span class="ident">ColorScheme</span>,

    <span class="doccomment">/// Level title -&gt; the top 3 scores</span>
    <span class="kw">pub</span> <span class="ident">high_scores</span>: <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">levels_unlocked</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">current_vehicle</span>: <span class="ident">String</span>,
    <span class="kw">pub</span> <span class="ident">vehicles_unlocked</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
    <span class="kw">pub</span> <span class="ident">upzones_unlocked</span>: <span class="ident">usize</span>,
    <span class="kw">pub</span> <span class="ident">upzones_explained</span>: <span class="ident">bool</span>,
    <span class="comment">// This was added after the main release, so keep old save files working by allowing it to be</span>
    <span class="comment">// missing.</span>
    <span class="attribute">#[<span class="ident">serde</span>(
        <span class="ident">serialize_with</span> <span class="op">=</span> <span class="string">&quot;serialize_multimap&quot;</span>,
        <span class="ident">deserialize_with</span> <span class="op">=</span> <span class="string">&quot;deserialize_multimap&quot;</span>,
        <span class="ident">default</span>
    )]</span>
    <span class="kw">pub</span> <span class="ident">upzones_per_level</span>: <span class="ident">MultiMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">BuildingID</span><span class="op">&gt;</span>,

    <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing</span>, <span class="ident">skip_deserializing</span>)]</span>
    <span class="kw">pub</span> <span class="ident">music</span>: <span class="ident">Music</span>,
    <span class="kw">pub</span> <span class="ident">play_music</span>: <span class="ident">bool</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ColorScheme</span> {
    <span class="kw">pub</span> <span class="ident">house</span>: <span class="ident">Color</span>,
    <span class="kw">pub</span> <span class="ident">apartment</span>: <span class="ident">Color</span>,
    <span class="kw">pub</span> <span class="ident">store</span>: <span class="ident">Color</span>,
    <span class="kw">pub</span> <span class="ident">visited</span>: <span class="ident">Color</span>,

    <span class="kw">pub</span> <span class="ident">score</span>: <span class="ident">Color</span>,
    <span class="kw">pub</span> <span class="ident">energy</span>: <span class="ident">Color</span>,
    <span class="kw">pub</span> <span class="ident">boost</span>: <span class="ident">Color</span>,
}

<span class="kw">impl</span> <span class="ident">Session</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">load</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Session</span> {
        <span class="kw">let</span> <span class="ident">levels</span> <span class="op">=</span> <span class="ident">Level</span>::<span class="ident">all</span>();

        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="kw-2">mut</span> <span class="ident">session</span>) <span class="op">=</span> <span class="ident">abstio</span>::<span class="ident">maybe_read_json</span>::<span class="op">&lt;</span><span class="ident">Session</span><span class="op">&gt;</span>(
            <span class="ident">abstio</span>::<span class="ident">path_player</span>(<span class="string">&quot;santa.json&quot;</span>),
            <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>::<span class="ident">throwaway</span>(),
        ) {
            <span class="kw">if</span> <span class="ident">session</span>.<span class="ident">levels</span> <span class="op">!</span><span class="op">=</span> <span class="ident">levels</span> {
                <span class="kw">if</span> <span class="ident">session</span>.<span class="ident">enable_modding</span> {
                    <span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Using modified levels from the session data&quot;</span>);
                } <span class="kw">else</span> {
                    <span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Levels have changed; overwriting with the new version from the code&quot;</span>);
                    <span class="ident">session</span>.<span class="ident">levels</span> <span class="op">=</span> <span class="ident">levels</span>;
                }
            }
            <span class="kw">return</span> <span class="ident">session</span>;
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">high_scores</span> <span class="op">=</span> <span class="ident">HashMap</span>::<span class="ident">new</span>();
        <span class="kw">for</span> <span class="ident">level</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">levels</span> {
            <span class="ident">high_scores</span>.<span class="ident">insert</span>(<span class="ident">level</span>.<span class="ident">title</span>.<span class="ident">clone</span>(), <span class="ident">Vec</span>::<span class="ident">new</span>());
        }
        <span class="ident">Session</span> {
            <span class="ident">levels</span>,
            <span class="ident">enable_modding</span>: <span class="bool-val">false</span>,
            <span class="ident">colors</span>: <span class="ident">ColorScheme</span> {
                <span class="ident">house</span>: <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#688865&quot;</span>),
                <span class="ident">apartment</span>: <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#C0F879&quot;</span>),
                <span class="ident">store</span>: <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#EE702E&quot;</span>),
                <span class="ident">visited</span>: <span class="ident">Color</span>::<span class="ident">BLACK</span>,

                <span class="ident">score</span>: <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#83AA51&quot;</span>),
                <span class="ident">energy</span>: <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#D8B830&quot;</span>),
                <span class="ident">boost</span>: <span class="ident">Color</span>::<span class="ident">hex</span>(<span class="string">&quot;#A32015&quot;</span>),
            },

            <span class="ident">high_scores</span>,
            <span class="ident">levels_unlocked</span>: <span class="number">1</span>,
            <span class="ident">current_vehicle</span>: <span class="string">&quot;bike&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">vehicles_unlocked</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;bike&quot;</span>.<span class="ident">to_string</span>()].<span class="ident">into_iter</span>().<span class="ident">collect</span>(),
            <span class="ident">upzones_unlocked</span>: <span class="number">0</span>,
            <span class="ident">upzones_explained</span>: <span class="bool-val">false</span>,
            <span class="ident">upzones_per_level</span>: <span class="ident">MultiMap</span>::<span class="ident">new</span>(),

            <span class="ident">music</span>: <span class="ident">Music</span>::<span class="ident">empty</span>(),
            <span class="ident">play_music</span>: <span class="bool-val">true</span>,
        }
    }

    <span class="doccomment">/// If a message is returned, a new level and some powers were unlocked.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">record_score</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">level</span>: <span class="ident">String</span>, <span class="ident">score</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">scores</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">high_scores</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">level</span>).<span class="ident">unwrap</span>();
        <span class="ident">scores</span>.<span class="ident">push</span>(<span class="ident">score</span>);
        <span class="ident">scores</span>.<span class="ident">sort</span>();
        <span class="ident">scores</span>.<span class="ident">reverse</span>();
        <span class="ident">scores</span>.<span class="ident">truncate</span>(<span class="number">3</span>);

        <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">levels</span>
            .<span class="ident">iter</span>()
            .<span class="ident">position</span>(<span class="op">|</span><span class="ident">lvl</span><span class="op">|</span> <span class="ident">lvl</span>.<span class="ident">title</span> <span class="op">=</span><span class="op">=</span> <span class="ident">level</span>)
            .<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">level</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">levels</span>[<span class="ident">idx</span>];
        <span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">levels_unlocked</span> <span class="op">&amp;&amp;</span> <span class="ident">score</span> <span class="op">&gt;</span><span class="op">=</span> <span class="ident">level</span>.<span class="ident">goal</span> {
            <span class="kw">if</span> <span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span> <span class="op">=</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">levels</span>.<span class="ident">len</span>() {
                <span class="prelude-val">Some</span>(<span class="macro">vec</span><span class="macro">!</span>[
                    <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;All levels complete! Nice.&quot;</span>),
                    <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Can you improve your score on other levels?&quot;</span>),
                ])
            } <span class="kw">else</span> {
                <span class="self">self</span>.<span class="ident">levels_unlocked</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">messages</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;New level unlocked!&quot;</span>)];
                <span class="kw">if</span> <span class="ident">level</span>.<span class="ident">unlock_upzones</span> <span class="op">&gt;</span> <span class="number">0</span> {
                    <span class="self">self</span>.<span class="ident">upzones_unlocked</span> <span class="op">+</span><span class="op">=</span> <span class="ident">level</span>.<span class="ident">unlock_upzones</span>;
                    <span class="ident">messages</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(
                        <span class="string">&quot;Unlocked the ability to upzone {} buildings&quot;</span>,
                        <span class="ident">level</span>.<span class="ident">unlock_upzones</span>
                    ));
                }
                <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">level</span>.<span class="ident">unlock_vehicles</span> {
                    <span class="self">self</span>.<span class="ident">vehicles_unlocked</span>.<span class="ident">insert</span>(<span class="ident">x</span>.<span class="ident">clone</span>());
                    <span class="ident">messages</span>.<span class="ident">push</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;Unlocked the {}&quot;</span>, <span class="ident">x</span>));
                }
                <span class="prelude-val">Some</span>(<span class="ident">messages</span>)
            }
        } <span class="kw">else</span> {
            <span class="comment">// Nothing new unlocked</span>
            <span class="prelude-val">None</span>
        };
        <span class="self">self</span>.<span class="ident">save</span>();
        <span class="ident">msg</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unlock_all</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">upzones_unlocked</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">for</span> <span class="ident">level</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">levels</span> {
            <span class="self">self</span>.<span class="ident">vehicles_unlocked</span>.<span class="ident">extend</span>(<span class="ident">level</span>.<span class="ident">unlock_vehicles</span>.<span class="ident">clone</span>());
            <span class="self">self</span>.<span class="ident">upzones_unlocked</span> <span class="op">+</span><span class="op">=</span> <span class="ident">level</span>.<span class="ident">unlock_upzones</span>;
        }
        <span class="self">self</span>.<span class="ident">levels_unlocked</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">levels</span>.<span class="ident">len</span>();
        <span class="self">self</span>.<span class="ident">upzones_explained</span> <span class="op">=</span> <span class="bool-val">true</span>;
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">update_music</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>) {
        <span class="kw">let</span> <span class="ident">play_music</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">play_music</span>;
        <span class="self">self</span>.<span class="ident">music</span>.<span class="ident">event</span>(<span class="ident">ctx</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">play_music</span>);
        <span class="kw">if</span> <span class="ident">play_music</span> <span class="op">!</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">play_music</span> {
            <span class="self">self</span>.<span class="ident">save</span>();
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">save</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="ident">abstio</span>::<span class="ident">write_json</span>(<span class="ident">abstio</span>::<span class="ident">path_player</span>(<span class="string">&quot;santa.json&quot;</span>), <span class="self">self</span>);
    }
}
</pre></div>
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