pub var NeonObjectTable = core.EngineObjectVTable.from(@This(), "main");

const GameContext = @This();

allocator: std.mem.Allocator,

commandQueue: core.RingQueue(Task),
activeCommand: ?*sys.SubprocessTask = null,

showInstructions: bool = false,
dockingInitialized: bool = false,

const Task = union(enum(u8)) {
    subprocess: *sys.SubprocessTask,
    func: *const fn (*GameContext) void,
};

pub fn init(allocator: std.mem.Allocator) !*@This() {
    const self = try allocator.create(@This());
    self.* = .{
        .allocator = allocator,
        .commandQueue = try core.RingQueue(Task).init(self.allocator, 4096),
    };

    return self;
}

pub fn prepare(self: *@This()) !void {
    _ = self;
    core.engine_log("program ready", .{});
    if (core.getEngineObject(imgui.utils.TopBar)) |topbar| {
        topbar.menuOpen = true;
    }
}

pub fn tick(self: *@This(), dt: f64) void {
    _ = dt;

    self.tickTasks() catch {};

    if (self.activeCommand != null or self.commandQueue.count() > 0) {
        ig.setNextWindowPos(.{ .x = 20, .y = 20 }, .{}, .{});

        if (ig.begin("tasks", null, .{
            .always_auto_resize = true,
            .no_title_bar = true,
            .no_move = true,
            .no_resize = true,
            .no_collapse = true,
        })) {}

        ig.end();
    }

    // Initialize docking layout on first run
    if (!self.dockingInitialized) {
        // Get the main viewport dockspace ID (created by dockSpaceOverViewport)
        const main_dockspace_id = ig.getID_Str("##DockSpaceViewport_11111111");

        // Dock our toolbox window to the center of the main dockspace
        ig.dockBuilderDockWindow("Toolbox Window", main_dockspace_id);

        ig.dockBuilderFinish(main_dockspace_id);
        self.dockingInitialized = true;
    }

    // Create a docked window
    if (ig.begin("Toolbox Window", null, .{})) {
        ig.textf("This is a docked toolbox window", .{});

        if (ig.button("Recompile Shaders", .{})) {
            start_RecompileShaders() catch {};
        }

        ig.separator();
        ig.textf("Additional toolbox content can go here", .{});

        if (self.activeCommand != null or self.commandQueue.count() > 0) {
            ig.textf("outstanding tasks: {d}", .{self.commandQueue.count() + 1});

            if (self.activeCommand) |cmd| {
                ig.textf("current command: ", .{});

                for (cmd.args) |arg| {
                    ig.textf("{s}", .{arg});
                    ig.sameLine(0, 4);
                }
            }
        }
    }
    ig.end();
}

fn start_RecompileShaders() !void {}

fn tickTasks(self: *@This()) !void {
    if (self.activeCommand == null) {
        if (self.commandQueue.popFromLocked()) |task| {
            switch (task) {
                .subprocess => |t| {
                    self.activeCommand = t;
                    // core.engine_log("starting task {any}", .{t.args});
                    try t.run();
                },
                .func => |f| {
                    f(self);
                },
            }
        }
    }

    if (self.activeCommand) |active| {
        if (active.checkComplete()) {
            active.destroy();
            core.engine_logs("task complete");
            self.activeCommand = null;
        }
    }
}

fn loadFileAllocFromCwd(allocator: std.mem.Allocator, dir: std.fs.Dir, path: []const u8) ![]u8 {
    var file = try dir.openFile(path, .{});
    defer file.close();
    const filesize = (try file.stat()).size + 1; // add null byte
    const buffer: []u8 = try allocator.alloc(u8, filesize);
    errdefer allocator.free(buffer);
    try file.reader().readNoEof(buffer[0 .. buffer.len - 1]);
    buffer[buffer.len - 1] = 0;
    return buffer;
}

fn displayInstructions(self: *@This()) void {
    self.showInstructions = true;
}

pub fn deinit(self: *@This()) void {
    self.allocator.destroy(self);
}

fn copyRecursiveDir(
    allocator: std.mem.Allocator,
    src_dir: *std.fs.Dir,
    dest_dir: *std.fs.Dir,
) !void {
    var walker = try src_dir.walk(allocator);
    defer walker.deinit();

    while (try walker.next()) |entry| {
        switch (entry.kind) {
            .file => {
                try entry.dir.copyFile(entry.basename, dest_dir.*, entry.path, .{});
            },
            .directory => {
                try dest_dir.makeDir(entry.path);
            },
            else => {},
        }
    }
}

pub fn main() anyerror!void {
    var spec = try api.getSpec("New Project Dialogue");
    try spec.put("useGPA", .{ .boolean = false });
    try spec.put("configName", .{ .string = "toolbox" });
    _ = api.startEngine(&NeonObjectTable, &spec);
}

const builtin = @import("builtin");
const std = @import("std");
const api = @import("backlog");
const imgui = api.imgui;
const ig = api.imgui.api;
const core = api.core;
const sys = api.sys;