const app = @import("appimgui");
const ig = app.ig;
const ifa = app.ifa;
const ip = @import("implot");
const ipz = @import("zimplot.zig");

// From C standard libraries
pub extern fn rand() c_int;

const IMGUI_HAS_DOCK = false; // Docking feature

const MainWinWidth: i32 = 1024;
const MainWinHeight: i32 = 900;

//-----------
// gui_main()
//-----------
pub fn gui_main(window: *app.Window) !void {
    _ = app.stf.setupFonts(null); // null: Setup default CJK fonts and Icon fonts

    const imPlotContext = ip.ImPlot_CreateContext();
    defer ip.ImPlot_DestroyContext(imPlotContext);

    //-------------
    // Global vars
    //-------------
    var showDemoWindow = true;
    var showImPlotDemoWindow = true;
    var showImPlotTestWindow = true;

    //------------------------
    // Select Dear ImGui style
    //------------------------
    ig.ImGui_StyleColorsClassic(null);
    //ig.ImGui_StyleColorsDark (null);
    //ig.ImGui_StyleColorsLight (null);

    //---------------
    // main loop GUI
    //---------------
    while (!window.shouldClose()) {
        window.pollEvents();

        // Iconify sleep
        if (window.isIconified()) {
            continue;
        }

        // Start the Dear ImGui frame
        window.frame();

        //------------------
        // Show demo window
        //------------------
        ig.ImGui_ShowDemoWindow(&showDemoWindow);
        ip.ImPlot_ShowDemoWindow(&showImPlotDemoWindow);
        window.showInfoWindow();

        if (showImPlotTestWindow) {
            imPlotWindow(&showImPlotTestWindow);
            imPlotWindow2(&showImPlotTestWindow);
        }

        //--------
        // render
        //--------
        window.render();
    } // while end
} // main end

//--------------
// imPlotWindow
//--------------
// Using "./zimplot.zig"
fn imPlotWindow(fshow: *bool) void {
    const numx = 20;
    const st = struct {
        var bar_data: [numx]ig.ImS32 = undefined;
        var x_data: [numx]ig.ImS32 = undefined;
        var y_data: [numx]ig.ImS32 = undefined;
        var initReq = true;
    };
    if (st.initReq) {
        st.initReq = false;
        for (0..numx) |i| {
            st.bar_data[i] = @mod(rand(), numx * numx);
            st.x_data[i] = @intCast(i);
            st.y_data[i] = @intCast(i * i);
        }
    }
    {
        _ = ig.ImGui_Begin("Plot Window", fshow, 0);
        defer ig.ImGui_End();
        if (ip.ImPlot_BeginPlot("My Plot", .{ .x = 0, .y = 0 }, 0)) {
            defer ip.ImPlot_EndPlot();
            // Using "./zimplot.zig"
            ipz.ImPlot_PlotBars(.{
                .label = "My Bar Plot",
                .values = &st.bar_data,
                .count = st.bar_data.len,
            });
            ipz.ImPlot_PlotLine(.{
                .label = "My Line Plot",
                .xs = &st.x_data,
                .ys = &st.y_data,
                .count = st.x_data.len,
            });
        }
    }
}

//---------------
// imPlotWindow2
//---------------
// Not using "./zimplot.zig"
fn imPlotWindow2(fshow: *bool) void {
    const numx = 20;
    const st = struct {
        var bar_data: [numx]ig.ImS32 = undefined;
        var x_data: [numx]ig.ImS32 = undefined;
        var y_data: [numx]ig.ImS32 = undefined;
        var initReq = true;
    };
    if (st.initReq) {
        st.initReq = false;
        for (0..numx) |i| {
            st.bar_data[i] = @mod(rand(), numx * numx);
            st.x_data[i] = @intCast(i);
            st.y_data[i] = @intCast(i * i);
        }
    }
    {
        _ = ig.ImGui_Begin("Plot Window2", fshow, 0);
        defer ig.ImGui_End();
        if (ip.ImPlot_BeginPlot("My Plot", .{ .x = 0, .y = 0 }, 0)) {
            defer ip.ImPlot_EndPlot();
            ip.ImPlot_PlotBars_S32PtrInt("My Bar Plot", &st.bar_data, st.bar_data.len, 0.67 // bar_size
                , 0.0 // shift
                , 0 // ImPlotFlags
                , 0 // offset
                , @sizeOf(ig.ImS32)); // stride
            ip.ImPlot_PlotLine_S32PtrS32Ptr("My LiSe Plot", &st.x_data, &st.y_data, st.x_data.len, 0 // ImPlotFlags
                , 0 // offset
                , @sizeOf(ig.ImS32)); // stride
        }
    }
}

//--------
// main()
//--------
pub fn main() !void {
    var window = try app.Window.createImGui(
        MainWinWidth,
        MainWinHeight,
        "Dear ImGui window in Zig",
        .{},
    );
    defer window.destroyImGui();

    //_ = window.setTheme(app.Theme.light); // Theme: dark, classic, light, microsoft

    //---------------
    // GUI main proc
    //---------------
    try gui_main(&window);
}