const std = @import("std");
const rl = @import("raylib");
const cm = @import("Cam");


pub var is_object_dragging : bool = undefined; // drag işlemi için gerekli
pub var freeMode = false;
pub var count_id : usize = 0; // bu değişken anlık id'yi tutar

// ışın ve ışına bağlı çarpışma ray ve raycollison değişkenleri ile yapılır.
pub var selected_shape_index:?usize = 0;

pub const ShapeType = enum {
    cube,
    rectangle,
    sphere,
    cylinder,
}; //tipler

pub const Shape = struct {
    id : usize = 0,
    name : [:0]const u8,
    position: rl.Vector3,
    color: rl.Color,

    data: union(enum) {
        // 'box' terimi hem küpü hem de dikdörtgen prizmayı kapsar
        cube: struct {
            width: f32,
            height: f32,
            length: f32,
        },
        sphere: struct {
            radius: f32,
        },
        cylinder: struct {
            radius: f32,
            height: f32,
        },
    },

    pub fn initCube(position: rl.Vector3, color: rl.Color, width: f32, height: f32, length: f32) Shape {
        count_id += 1;
        return Shape{
            .id = count_id,
            .name = "count_id",
            .position = position,
            .color = color,
            .data = .{ .cube = .{ .width = width, .height = height, .length = length } },
        };
    }

    // Küre için özel init metodu
    pub fn initSphere(position: rl.Vector3, color: rl.Color, radius: f32) Shape {
        count_id += 1;
        return Shape{
            .id = count_id,
            .name= "count_id",
            .position = position,
            .color = color,
            .data = .{ .sphere = .{ .radius = radius } },
        };
    }
    
    // Silindir için özel init metodu
    pub fn initCylinder(position: rl.Vector3, color: rl.Color, radius: f32, height: f32) Shape {
        count_id += 1;
        return Shape{
            .id = count_id,
            .name = "count_id",
            .position = position,
            .color = color,
            .data = .{ .cylinder = .{ .radius = radius, .height = height } },
        };
    }
};


pub fn findClosestHitObject(
    mouse_position: rl.Vector2,
    camera: rl.Camera3D,
    shapes: *std.ArrayList(Shape),
) void {
    // Fare tuşuna basılıyorsa kontrol et
    if (!rl.isMouseButtonPressed(.left)) {
        return;
    }
    
    const ray = rl.getScreenToWorldRay(mouse_position, camera);

    var closest_hit_index: ?usize = null;
    var closest_distance = std.math.floatMax(f32);

    for (shapes.items, 0..) |shape, index| {
        var hit_info = rl.RayCollision{.hit = false, .distance = 0.0,
            .normal = rl.Vector3.init(0, 0, 0),
            .point = rl.Vector3.init(0, 0, 0)};
        
        switch (shape.data) {
            .cube => |cube_data| {
                const box = getBoundingBoxForCube(shape.position,
                             cube_data.width, cube_data.height, cube_data.length);
                hit_info = rl.getRayCollisionBox(ray, box);
            },
            .sphere => |sphere_data| {
                hit_info = rl.getRayCollisionSphere(ray, shape.position, sphere_data.radius);
            },
            .cylinder => |cylinder_data| {
                // Performans için BoundingBox çarpışma testini kullan
                const box = getBoundingBoxForCylinder(shape.position, cylinder_data.radius, cylinder_data.height);
                hit_info = rl.getRayCollisionBox(ray, box);
            },
        }

        if (hit_info.hit and hit_info.distance < closest_distance) {
            closest_hit_index = index;
            closest_distance = hit_info.distance;
        }
    }

    selected_shape_index = closest_hit_index;
}


pub fn inputControls() void {

    if (rl.isMouseButtonPressed(.right)) {
        freeMode = !freeMode;
        if (freeMode) {
            rl.disableCursor();
        } else {
            rl.enableCursor();
        }
    }
}


pub fn getBoundingBoxForCube(position: rl.Vector3, width: f32, height: f32, length: f32) rl.BoundingBox {
    // Nesnenin boyutlarının yarısını hesapla
    const half_width = width / 2.0;
    const half_height = height / 2.0;
    const half_length = length / 2.0;

    // Minimum köşeyi (sol alt arka) hesapla
    const min_x = position.x - half_width;
    const min_y = position.y - half_height;
    const min_z = position.z - half_length;

    // Maksimum köşeyi (sağ üst ön) hesapla
    const max_x = position.x + half_width;
    const max_y = position.y + half_height;
    const max_z = position.z + half_length;

    return rl.BoundingBox{
        .min = rl.Vector3.init(min_x, min_y, min_z),
        .max = rl.Vector3.init(max_x, max_y, max_z),
    };
}


pub fn getBoundingBoxForCylinder(position: rl.Vector3, radius: f32, height: f32) rl.BoundingBox {
    // Yüksekliğin yarısını hesapla
    const half_height = height / 2.0;

    // Minimum köşe noktasını (min x, min y, min z) hesapla
    const min_x = position.x - radius;
    const min_y = position.y - half_height;
    const min_z = position.z - radius;

    // Maksimum köşe noktasını (max x, max y, max z) hesapla
    const max_x = position.x + radius;
    const max_y = position.y + half_height;
    const max_z = position.z + radius;

    // BoundingBox yapısını döndür
    return rl.BoundingBox{
        .min = rl.Vector3.init(min_x, min_y, min_z),
        .max = rl.Vector3.init(max_x, max_y, max_z),
    };
}