#pragma once

#include <al/types.h>

enum {
    CAMU_VIEW_NONE = 0,
    CAMU_VIEW_AUTOFIT,
    CAMU_VIEW_ZOOM,
    CAMU_VIEW_DETACHED
};

enum {
    CAMU_VIEW_ROTATION_0 = 0,
    CAMU_VIEW_ROTATION_90,
    CAMU_VIEW_ROTATION_180,
    CAMU_VIEW_ROTATION_270,
    CAMU_VIEW_ROTATION_360
};

enum {
    CAMU_VR_DISABLED = 0,
    CAMU_VR_180,
    CAMU_VR_360
};

#define CAMU_DEFAULT_VIEW CAMU_VIEW_AUTOFIT

#define CAMU_DEFAULT_FOV 80.0

struct camu_view {
    u8 mode;
    u8 rotation;
    u32 width;
    u32 height;
    s32 zindex;
    f64 zoom;
    f64 x_offset;
    f64 y_offset;
    f64 stretch;
    f64 fov;
};

static inline const char *camu_view_rotation_name(u8 rotation)
{
    switch (rotation) {
    case CAMU_VIEW_ROTATION_0: return "0";
    case CAMU_VIEW_ROTATION_90: return "90";
    case CAMU_VIEW_ROTATION_180: return "180";
    case CAMU_VIEW_ROTATION_270: return "270";
    case CAMU_VIEW_ROTATION_360: return "360";
    }
    al_assert_and_return("");
}

// This handles wrapping backwards for negative numbers.
static inline u8 camu_view_normalize_rotation(s32 rotation)
{
    return (u8)((rotation % CAMU_VIEW_ROTATION_360 + CAMU_VIEW_ROTATION_360) % CAMU_VIEW_ROTATION_360);
}

void camu_view_init(struct camu_view *view, u32 width, u32 height, u8 rotation);
void camu_view_calculate(struct camu_view *view, u32 window_width, u32 window_height);
bool camu_view_zoom_simple(struct camu_view *view, u32 window_width, u32 window_height, f64 x, f64 y, f64 v);
bool camu_view_pan_simple(struct camu_view *view, u32 window_width, u32 window_height, f64 dx, f64 dy);
bool camu_view_zoom_fov(struct camu_view *view, f64 v);