const core = @import("core");
const std = @import("std");
const memory = core.MemoryTracker;

const engine_log = core.engine_log;
const engine_logs = core.engine_logs;

const exampleScene = @import("exampleScene.zig");
const SampleSubsystem = @import("samplesubsystem.zig");

test "simple systems setup for core" {
    std.testing.refAllDecls(core.algorithm);

    memory.MTSetup(std.testing.allocator, .{ .timeline = false });
    defer memory.MTShutdown();
    const tracker = memory.MTGet().?;
    const allocator = tracker.allocator();

    std.debug.print("Starting up \n", .{});
    engine_logs("systems starting");

    var map = try core.createSpecVariant(.{ .name = "test" }, allocator);
    defer map.deinit();

    try core.start_module(&map, .{ .unitTest = true }, allocator);
    defer core.shutdown_module(allocator);

    const subsystem = try core.createObject(SampleSubsystem, .{});
    const scene = try allocator.create(exampleScene.Scene);
    defer allocator.destroy(scene);

    subsystem.scene = scene;
    subsystem.setPositionPtr = @ptrCast(&exampleScene.Scene.setPosition);

    engine_logs("systems started, shutting down");

    engine_logs("this is a new print added to the test function");
    engine_logs("this is a new print added to the test function");
    memory.MTPrintStatsDelta();

    try test_loadingConfigs();
    try test_consoleCommands();
    try test_gameObjects(std.testing.allocator);

    try test_loadModules();

    try test_objectLoaderRegistry();
    // try generateRandomSamples();

    try memory.dumpTimeline("test-core-timeline.txt");
}

fn test_objectLoaderRegistry() !void {
    const inputStack = core.getEngineObject(core.inputs.InputStack);
    try core.assert(inputStack == core.getInputStack());
}

pub fn test_loadModules() !void {
    _ = try core.loadModule("external", true);
    const moduleLoader = core.getEngineObject(core.ModuleLoader).?;

    std.Thread.sleep(1e9 * 0.1);
    moduleLoader.tick(0.1);
}

fn generateRandomSamples() !void {
    var prng = std.Random.DefaultPrng.init(blk: {
        var seed: u64 = undefined;
        try std.posix.getrandom(std.mem.asBytes(&seed));
        break :blk seed;
    });
    const rand = prng.random();

    std.debug.print("const float3[] = {{", .{});
    for (0..64) |i| {
        var vec = core.Vectorf{
            .x = rand.float(f32) * 2.0 - 1.0,
            .y = rand.float(f32) * 2.0 - 1.0,
            .z = rand.float(f32),
        };

        vec = vec.normalize();
        vec = vec.fmul(rand.float(f32));

        var scale: f32 = @as(f32, @floatFromInt(i)) / 64.0;
        scale = scale * core.lerp(0.1, 1.0, scale * scale);
        vec = vec.fmul(scale);

        // std.debug.print("( {d}, {d}, {d} )\n", .{ vec.x, vec.y, vec.z });
        std.debug.print("   float3( {d}, {d}, {d} ),\n", .{ vec.x, vec.y, vec.z });
    }

    std.debug.print("}};\n", .{});
}

fn test_loadingConfigs() !void {
    if (core.getConfigVar(u32, "platform.extent.width")) |width| {
        core.engine_log("config: {d}", .{width});
    }

    if (core.getConfigVar(u64, "platform.extent.height")) |height| {
        core.engine_log("config: {d}", .{height});
    }

    if (core.getConfigVar(f32, "platform.extent.height")) |height| {
        core.engine_log("config f32: {d}", .{height});
    }

    if (core.getConfigVar(f64, "platform.extent.height")) |height| {
        core.engine_log("config f64: {d}", .{height});
    }

    if (core.getConfigVar([]const u8, "platform.windowName")) |height| {
        core.engine_log("config string: {s}", .{height});
    }

    try core.assert(core.configVar(f64, "platform.extent.height", 0) == core.getConfigVar(f64, "platform.extent.height").?);
}

fn test_consoleCommands() !void {
    const ConsoleCommands = struct {
        pub fn echo(args: []const u8) void {
            core.engine_log("{s}", .{args});
        }

        pub fn foo(args: []const u8) void {
            core.engine_log("foo function called with args {s}", .{args});
        }
    };

    try core.console.addCommand("echo", ConsoleCommands.echo);
    try core.console.addCommand("foo", ConsoleCommands.foo);

    const T = struct {
        var ScreenResolution: u32 = undefined;

        pub fn F(args: []const u8) void {
            core.engine_log("Setting screen resolution to = {s}", .{args});
            ScreenResolution = std.fmt.parseInt(u32, args, 10) catch return;
        }
    };

    T.ScreenResolution = core.configVar(u32, "Some.bullshit.ScreenResolution", 420);
    try core.assert(T.ScreenResolution == 420);
    try core.console.addCommand("ScreenResolution", T.F);
    core.console.evaluate("ScreenResolution 1");
    try core.assert(T.ScreenResolution == 1);

    core.console.evaluate("echo lmfao");
    core.console.evaluate("foo lmfao");
}

fn test_gameObjects(allocator: std.mem.Allocator) !void {
    engine_logs("test: gameobjects... ");

    const objList = try core.GameObjectList.create(allocator);
    defer objList.destroy();

    const GameObject = struct {
        data: core.GameObjectData = undefined,
        entity: core.Entity,

        pub fn create(alloc: std.mem.Allocator) !*@This() {
            const self = try alloc.create(@This());
            self.entity = try core.createEntity();
            _ = self.entity.addComponent(core.Scene);

            return self;
        }

        pub fn getEntity(self: *@This()) core.Entity {
            return self.entity;
        }

        pub fn tick(self: *@This(), dt: f64) void {
            _ = dt;
            engine_log("gameObject ticking.... {d} {d}", .{ self.data.index, self.entity.handle.index });
        }

        pub fn destroy(self: *@This()) void {
            self.entity.destroy();
            self.data.release(self);
        }
    };

    const gameObject = try objList.newObject(GameObject);

    const gameObject2 = try objList.newObject(GameObject);
    objList.tick(0.016);
    gameObject.destroy();

    objList.tick(0.016);
    gameObject2.destroy();
    objList.tick(0.016);

    const spawnFunc = core.GameObjectList.spawnObjectFunction(GameObject);
    const interface = spawnFunc(objList).?;

    core.engine_log("lol", .{});

    core.engine_log("handle = {x}", .{interface.vtable.getEntity.?(interface.ptr).handle.index});

    objList.tick(0.016);

    try exampleScene.doTest();
}