/*
    Copyright (c) 2015
    vurtun <polygone@gmx.net>
    MIT licence
*/
#ifndef GUI_H_
#define GUI_H_

#ifdef __cplusplus
extern "C" {
#endif

#define GUI_UTF_SIZE 4
#define GUI_INPUT_MAX 16

#ifdef GUI_USE_FIXED_TYPES
#include <stdint.h>
typedef int32_t gui_int;
typedef int32_t gui_bool;
typedef int16_t gui_short;
typedef int64_t gui_long;
typedef float gui_float;
typedef uint32_t gui_uint;
typedef uint64_t gui_ulong;
typedef uint32_t gui_flags;
typedef uint8_t gui_char;
typedef uint8_t gui_byte;
typedef uint32_t gui_flag;
typedef uint64_t gui_size;
#else
typedef int gui_int;
typedef int gui_bool;
typedef short gui_short;
typedef long gui_long;
typedef float gui_float;
typedef unsigned int gui_uint;
typedef unsigned long gui_ulong;
typedef unsigned int gui_flags;
typedef unsigned char gui_char;
typedef unsigned char gui_byte;
typedef unsigned int gui_flag;
typedef unsigned long gui_size;
#endif

enum {gui_false, gui_true};
enum gui_heading {GUI_UP, GUI_RIGHT, GUI_DOWN, GUI_LEFT};
struct gui_color {gui_byte r,g,b,a;};
struct gui_colorf {gui_float r,g,b,a;};
struct gui_vec2 {gui_float x,y;};
struct gui_rect {gui_float x,y,w,h;};
struct gui_key {gui_bool down, clicked;};
struct gui_font;

typedef gui_char gui_glyph[GUI_UTF_SIZE];
typedef gui_size(*gui_text_width_f)(void*,const gui_char*, gui_size);
typedef void(*gui_scissor)(void*, gui_float, gui_float, gui_float, gui_float);
typedef void(*gui_draw_line)(void*, gui_float, gui_float, gui_float, gui_float, struct gui_color);
typedef void(*gui_draw_rect)(void*, gui_float, gui_float, gui_float, gui_float, struct gui_color);
typedef void(*gui_draw_circle)(void*, gui_float, gui_float, gui_float, gui_float, struct gui_color);
typedef void(*gui_draw_triangle)(void*, const struct gui_vec2*, struct gui_color);
typedef void(*gui_draw_bitmap)(void*, gui_float, gui_float, gui_float, gui_float,
                            const struct gui_rect*, void*);
typedef void(*gui_draw_text)(void*, gui_float, gui_float, gui_float, gui_float,
                            const gui_char*, gui_size, const struct gui_font*,
                            struct gui_color, struct gui_color);
struct gui_font {
    void *userdata;
    gui_float height;
    gui_text_width_f width;
};

enum gui_keys {
    GUI_KEY_SHIFT,
    GUI_KEY_CTRL,
    GUI_KEY_DEL,
    GUI_KEY_ENTER,
    GUI_KEY_BACKSPACE,
    GUI_KEY_ESCAPE,
    GUI_KEY_SPACE,
    GUI_KEY_MAX
};

struct gui_input {
    struct gui_key keys[GUI_KEY_MAX];
    gui_char text[GUI_INPUT_MAX];
    gui_size text_len;
    struct gui_vec2 mouse_pos;
    struct gui_vec2 mouse_prev;
    struct gui_vec2 mouse_delta;
    gui_bool mouse_down;
    gui_uint mouse_clicked;
    struct gui_vec2 mouse_clicked_pos;
};

struct gui_canvas {
    void *userdata;
    gui_size width;
    gui_size height;
    struct gui_font font;
    gui_scissor scissor;
    gui_draw_line draw_line;
    gui_draw_rect draw_rect;
    gui_draw_circle draw_circle;
    gui_draw_triangle draw_triangle;
    gui_draw_bitmap draw_bitmap;
    gui_draw_text draw_text;
};

enum gui_text_align {
    GUI_TEXT_LEFT,
    GUI_TEXT_CENTERED,
    GUI_TEXT_RIGHT
};

struct gui_text {
    struct gui_vec2 padding;
    enum gui_text_align align;
    struct gui_color foreground;
    struct gui_color background;
};

struct gui_image {
    struct gui_vec2 padding;
    struct gui_color background;
};

enum gui_button_behavior {
    GUI_BUTTON_DEFAULT,
    GUI_BUTTON_REPEATER
};

struct gui_button {
    gui_float border;
    struct gui_vec2 padding;
    struct gui_color background;
    struct gui_color foreground;
    struct gui_color content;
    struct gui_color highlight;
    struct gui_color highlight_content;
};

enum gui_toggle_type {
    GUI_TOGGLE_CHECK,
    GUI_TOGGLE_OPTION
};

struct gui_toggle {
    struct gui_vec2 padding;
    struct gui_color font;
    struct gui_color background;
    struct gui_color foreground;
};

struct gui_slider {
    struct gui_vec2 padding;
    struct gui_color background;
    struct gui_color foreground;
};

struct gui_scroll {
    struct gui_color background;
    struct gui_color foreground;
    struct gui_color border;
};

enum gui_input_filter {
    GUI_INPUT_DEFAULT,
    GUI_INPUT_FLOAT,
    GUI_INPUT_DEC,
    GUI_INPUT_HEX,
    GUI_INPUT_OCT,
    GUI_INPUT_BIN
};

struct gui_input_field {
    struct gui_vec2 padding;
    gui_bool show_cursor;
    enum gui_input_filter filter;
    struct gui_color background;
    struct gui_color foreground;
    struct gui_color font;
};

struct gui_plot {
    struct gui_vec2 padding;
    struct gui_color background;
    struct gui_color foreground;
    struct gui_color highlight;
};

struct gui_histo {
    struct gui_vec2 padding;
    struct gui_color background;
    struct gui_color foreground;
    struct gui_color negative;
    struct gui_color highlight;
};

enum gui_panel_colors {
    GUI_COLOR_TEXT,
    GUI_COLOR_PANEL,
    GUI_COLOR_BORDER,
    GUI_COLOR_TITLEBAR,
    GUI_COLOR_BUTTON,
    GUI_COLOR_BUTTON_BORDER,
    GUI_COLOR_BUTTON_HOVER,
    GUI_COLOR_BUTTON_HOVER_FONT,
    GUI_COLOR_CHECK,
    GUI_COLOR_CHECK_ACTIVE,
    GUI_COLOR_OPTION,
    GUI_COLOR_OPTION_ACTIVE,
    GUI_COLOR_SCROLL,
    GUI_COLOR_SCROLL_CURSOR,
    GUI_COLOR_SLIDER,
    GUI_COLOR_SLIDER_CURSOR,
    GUI_COLOR_PROGRESS,
    GUI_COLOR_PROGRESS_CURSOR,
    GUI_COLOR_INPUT,
    GUI_COLOR_INPUT_BORDER,
    GUI_COLOR_SPINNER,
    GUI_COLOR_SPINNER_BORDER,
    GUI_COLOR_SELECTOR,
    GUI_COLOR_SELECTOR_BORDER,
    GUI_COLOR_HISTO,
    GUI_COLOR_HISTO_BARS,
    GUI_COLOR_HISTO_NEGATIVE,
    GUI_COLOR_HISTO_HIGHLIGHT,
    GUI_COLOR_PLOT,
    GUI_COLOR_PLOT_LINES,
    GUI_COLOR_PLOT_HIGHLIGHT,
    GUI_COLOR_SCROLLBAR,
    GUI_COLOR_SCROLLBAR_CURSOR,
    GUI_COLOR_SCROLLBAR_BORDER,
    GUI_COLOR_SCALER,
    GUI_COLOR_COUNT
};

struct gui_config {
    struct gui_vec2 panel_padding;
    struct gui_vec2 panel_min_size;
    struct gui_vec2 item_spacing;
    struct gui_vec2 item_padding;
    struct gui_vec2 scaler_size;
    gui_float scrollbar_width;
    struct gui_color colors[GUI_COLOR_COUNT];
};

enum gui_panel_flags {
    GUI_PANEL_HIDDEN = 0x01,
    GUI_PANEL_BORDER = 0x02,
    GUI_PANEL_MINIMIZABLE = 0x4,
    GUI_PANEL_CLOSEABLE = 0x8,
    GUI_PANEL_MOVEABLE = 0x10,
    GUI_PANEL_SCALEABLE = 0x20,
    /* internal */
    GUI_PANEL_SCROLLBAR = 0x40,
    GUI_PANEL_TAB = 0x80
};

struct gui_panel {
    gui_flags flags;
    gui_float x, y;
    gui_float w, h;
    gui_float at_y;
    gui_float width, height;
    gui_size index;
    gui_float header_height;
    gui_float row_height;
    gui_size row_columns;
    gui_float offset;
    gui_bool minimized;
    struct gui_rect clip;
    const struct gui_input *in;
    const struct gui_config *config;
    const struct gui_canvas *canvas;
};

/* Input */
void gui_input_begin(struct gui_input*);
void gui_input_motion(struct gui_input*, gui_int x, gui_int y);
void gui_input_key(struct gui_input*, enum gui_keys, gui_bool down);
void gui_input_button(struct gui_input*, gui_int x, gui_int y, gui_bool down);
void gui_input_char(struct gui_input*, const gui_glyph);
void gui_input_end(struct gui_input*);

/* Widgets */
void gui_text(const struct gui_canvas*, gui_float x, gui_float y, gui_float w, gui_float h,
                    const struct gui_text*, const char *text, gui_size len);
gui_bool gui_button_text(const struct gui_canvas*, gui_float x, gui_float y,
                    gui_float w, gui_float h, const struct gui_button*, const char*,
                    enum gui_button_behavior, const struct gui_input*);
gui_bool gui_button_triangle(const struct gui_canvas*, gui_float x, gui_float y,
                    gui_float w, gui_float h, const struct gui_button*, enum gui_heading,
                    enum gui_button_behavior, const struct gui_input*);
gui_bool gui_button_icon(const struct gui_canvas*, gui_float x, gui_float y,
                    gui_float w, gui_float h, const struct gui_button*, void *bitmap,
                    const struct gui_rect *src, enum gui_button_behavior, const struct gui_input*);
gui_bool gui_toggle(const struct gui_canvas*, gui_float x, gui_float y, gui_float w,
                    gui_float h, gui_bool, const char*, const struct gui_toggle*,
                    enum gui_toggle_type, const struct gui_input*);
gui_float gui_slider(const struct gui_canvas*, gui_float x, gui_float y, gui_float w,
                    gui_float h, gui_float min, gui_float val, gui_float max, gui_float step,
                    const struct gui_slider*, const struct gui_input*);
gui_size gui_progress(const struct gui_canvas*, gui_float x, gui_float y, gui_float w,
                    gui_float h, gui_size value, gui_size max, gui_bool modifyable,
                    const struct gui_slider*, const struct gui_input*);
gui_size gui_input(const struct gui_canvas*, gui_float x, gui_float y, gui_float w,
                    gui_float h, gui_char*, gui_size, gui_size max, gui_bool*,
                    const struct gui_input_field*, const struct gui_input*);
gui_int gui_histo(const struct gui_canvas*, gui_float x, gui_float y, gui_float w,
                    gui_float h, const gui_float*, gui_size,
                    const struct gui_histo*, const struct gui_input*);
gui_int gui_plot(const struct gui_canvas*, gui_float x, gui_float y, gui_float w,
                    gui_float h, const gui_float*, gui_size,
                    const struct gui_plot*, const struct gui_input*);
gui_float gui_scroll(const struct gui_canvas*, gui_float x, gui_float y,
                    gui_float w, gui_float h, gui_float offset, gui_float target,
                    gui_float step, const struct gui_scroll*, const struct gui_input*);

/* Panel */
void gui_default_config(struct gui_config*);
gui_bool gui_panel_begin(struct gui_panel*, const char*, gui_float x, gui_float y,
                    gui_float w, gui_float h, gui_flags, const struct gui_config*,
                    const struct gui_canvas*, const struct gui_input*);
gui_bool gui_panel_is_hidden(const struct gui_panel*);
void gui_panel_layout(struct gui_panel*, gui_float height, gui_size cols);
void gui_panel_seperator(struct gui_panel*, gui_size cols);
void gui_panel_text(struct gui_panel*, const char *str, gui_size len, enum gui_text_align);
gui_bool gui_panel_check(struct gui_panel*, const char*, gui_bool active);
gui_bool gui_panel_option(struct gui_panel*, const char*, gui_bool active);
gui_bool gui_panel_button_text(struct gui_panel*, const char*, enum gui_button_behavior);
gui_bool gui_panel_button_color(struct gui_panel*, const struct gui_color, enum gui_button_behavior);
gui_bool gui_panel_button_triangle(struct gui_panel*, enum gui_heading, enum gui_button_behavior);
gui_bool gui_panel_button_toggle(struct gui_panel*, const char*, gui_bool value);
gui_bool gui_panel_button_icon(struct gui_panel*, void *bitmap, const struct gui_rect*,
                    enum gui_button_behavior);
gui_float gui_panel_slider(struct gui_panel*, gui_float min, gui_float val,
                    gui_float max, gui_float step);
gui_size gui_panel_progress(struct gui_panel*, gui_size cur, gui_size max,
                    gui_bool modifyable);
gui_size gui_panel_input(struct gui_panel*, gui_char *buffer, gui_size len,
                    gui_size max, gui_bool *active, enum gui_input_filter);
gui_bool gui_panel_spinner(struct gui_panel*, gui_int min, gui_int *value,
                    gui_int max, gui_int step, gui_bool active);
gui_size gui_panel_selector(struct gui_panel*, const char *items[],
                    gui_size item_count, gui_size item_current);
gui_int gui_panel_plot(struct gui_panel*, const gui_float *values, gui_size value_count);
gui_int gui_panel_histo(struct gui_panel*, const gui_float *values, gui_size value_count);
gui_bool gui_panel_tab_begin(struct gui_panel*, struct gui_panel*, const char *title, gui_bool minimized);
void gui_panel_tab_end(struct gui_panel*, struct gui_panel *tab);
void gui_panel_group_begin(struct gui_panel *panel, struct gui_panel*, const char *title, gui_float offset);
gui_float gui_panel_group_end(struct gui_panel*, struct gui_panel* tab);
gui_size gui_panel_shelf_begin(struct gui_panel*, struct gui_panel *shelf,
                    const char *tabs[], gui_size size, gui_size active, gui_float offset);
gui_float gui_panel_shelf_end(struct gui_panel*, struct gui_panel *shelf);
void gui_panel_end(struct gui_panel*);

#ifdef __cplusplus
}
#endif

#endif