#ifndef TERM_INPUT_TYPES_H
#define TERM_INPUT_TYPES_H

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "term_types.h"

#ifdef __cplusplus
extern "C" {
#endif

enum term_key {
    TERM_KEY_NONE = 0,

    TERM_KEY_RETURN,
    TERM_KEY_BACKSPACE,
    TERM_KEY_TAB,
    TERM_KEY_ESCAPE,

    TERM_KEY_UP,
    TERM_KEY_DOWN,
    TERM_KEY_RIGHT,
    TERM_KEY_LEFT,
    TERM_KEY_HOME,
    TERM_KEY_END,
    TERM_KEY_PAGE_UP,
    TERM_KEY_PAGE_DOWN,
    TERM_KEY_INSERT,
    TERM_KEY_DELETE,

    TERM_KEY_F1,  TERM_KEY_F2,  TERM_KEY_F3,  TERM_KEY_F4,  TERM_KEY_F5,
    TERM_KEY_F6,  TERM_KEY_F7,  TERM_KEY_F8,  TERM_KEY_F9,  TERM_KEY_F10,
    TERM_KEY_F11, TERM_KEY_F12, TERM_KEY_F13, TERM_KEY_F14, TERM_KEY_F15,
    TERM_KEY_F16, TERM_KEY_F17, TERM_KEY_F18, TERM_KEY_F19, TERM_KEY_F20,
    TERM_KEY_F21, TERM_KEY_F22, TERM_KEY_F23, TERM_KEY_F24, TERM_KEY_F25,
    TERM_KEY_F26, TERM_KEY_F27, TERM_KEY_F28, TERM_KEY_F29, TERM_KEY_F30,
    TERM_KEY_F31, TERM_KEY_F32, TERM_KEY_F33, TERM_KEY_F34, TERM_KEY_F35,

    TERM_KEY_KP_0, TERM_KEY_KP_1, TERM_KEY_KP_2, TERM_KEY_KP_3, TERM_KEY_KP_4,
    TERM_KEY_KP_5, TERM_KEY_KP_6, TERM_KEY_KP_7, TERM_KEY_KP_8, TERM_KEY_KP_9,
    TERM_KEY_KP_DECIMAL,
    TERM_KEY_KP_ENTER,
    TERM_KEY_KP_ADD,
    TERM_KEY_KP_SUBTRACT,
    TERM_KEY_KP_MULTIPLY,
    TERM_KEY_KP_DIVIDE,
    TERM_KEY_KP_EQUAL,
    TERM_KEY_KP_SEPARATOR,
    TERM_KEY_KP_LEFT,
    TERM_KEY_KP_RIGHT,
    TERM_KEY_KP_UP,
    TERM_KEY_KP_DOWN,
    TERM_KEY_KP_PAGE_UP,
    TERM_KEY_KP_PAGE_DOWN,
    TERM_KEY_KP_HOME,
    TERM_KEY_KP_END,
    TERM_KEY_KP_INSERT,
    TERM_KEY_KP_DELETE,
    TERM_KEY_KP_BEGIN,

    TERM_KEY_CAPS_LOCK,
    TERM_KEY_SCROLL_LOCK,
    TERM_KEY_NUM_LOCK,
    TERM_KEY_PRINT_SCREEN,
    TERM_KEY_PAUSE,
    TERM_KEY_MENU,

    TERM_KEY_MEDIA_PLAY,
    TERM_KEY_MEDIA_PAUSE,
    TERM_KEY_MEDIA_STOP,
    TERM_KEY_MEDIA_FORWARD,
    TERM_KEY_MEDIA_REWIND,
    TERM_KEY_MEDIA_NEXT,
    TERM_KEY_MEDIA_PREV,
    TERM_KEY_MEDIA_RECORD,
    TERM_KEY_VOLUME_DOWN,
    TERM_KEY_VOLUME_UP,
    TERM_KEY_MUTE,

    TERM_KEY_LSHIFT,
    TERM_KEY_LCTRL,
    TERM_KEY_LALT,
    TERM_KEY_LSUPER,
    TERM_KEY_LHYPER,
    TERM_KEY_LMETA,
    TERM_KEY_RSHIFT,
    TERM_KEY_RCTRL,
    TERM_KEY_RALT,
    TERM_KEY_RSUPER,
    TERM_KEY_RHYPER,
    TERM_KEY_RMETA,
    TERM_KEY_ISO_LEVEL3_SHIFT,
    TERM_KEY_ISO_LEVEL5_SHIFT,

    TERM_KEY_COUNT
};

enum term_mod {
    TERM_MOD_SHIFT = 1,
    TERM_MOD_ALT   = 2,
    TERM_MOD_CTRL  = 4,
    TERM_MOD_SUPER = 8,
    TERM_MOD_HYPER = 16,
    TERM_MOD_META  = 32,
    TERM_MOD_CAPS  = 64,
    TERM_MOD_NUM   = 128,
};

enum term_key_action {
    TERM_KEY_PRESS   = 1,
    TERM_KEY_REPEAT  = 2,
    TERM_KEY_RELEASE = 3,
};

enum term_mouse_button {
    TERM_MOUSE_BUTTON_PRIMARY = 0,
    TERM_MOUSE_BUTTON_MIDDLE,
    TERM_MOUSE_BUTTON_SECONDARY,
    TERM_MOUSE_BUTTON_NONE,
    /* Extra buttons 8 through 11 in xterm mouse reporting (encoded as 128..131). */
    TERM_MOUSE_BUTTON_EXTRA_1,
    TERM_MOUSE_BUTTON_EXTRA_2,
    TERM_MOUSE_BUTTON_EXTRA_3,
    TERM_MOUSE_BUTTON_EXTRA_4,
    TERM_MOUSE_WHEEL_UP = 16,
    TERM_MOUSE_WHEEL_DOWN,
    TERM_MOUSE_WHEEL_LEFT,
    TERM_MOUSE_WHEEL_RIGHT,
};

enum term_mouse_event_kind {
    TERM_MOUSE_PRESS = 0,
    TERM_MOUSE_RELEASE,
    TERM_MOUSE_MOTION,
    TERM_MOUSE_SCROLL,
    TERM_MOUSE_LEAVE,
};

struct term_key_event {
    enum term_key_action action;
    uint16_t key;           /* enum term_key; TERM_KEY_NONE for a text key */
    uint16_t keypad;        /* the TERM_KEY_KP_* key when the key is on the keypad */
    unsigned mods;          /* enum term_mod */
    uint32_t codepoint;     /* the code point of the key without modifiers */
    uint32_t shifted;       /* the code point of the key with Shift */
    uint32_t base;          /* the code point of the key in the US layout */
    uint32_t text;          /* the code point the key types, or 0 */
    bool text_deferred;     /* an input method sends the text later */
};

struct term_mouse_event {
    struct term_vector2i pos;   /* Grid cell coordinates (col, row) */
    struct term_vector2i pixel; /* Absolute pixel position in terminal grid */
    /*
     * Button identifier:
     * - Press and release: the button that changed state (TERM_MOUSE_BUTTON_*).
     * - Motion: the held button for drag events, or TERM_MOUSE_BUTTON_NONE for hover.
     * - Scroll: the wheel direction (TERM_MOUSE_WHEEL_*).
     */
    int button;
    unsigned mods;
    int scroll_lines;
    float scroll_delta;
    enum term_mouse_event_kind kind;
};

/* The keys that are down. An all-zero value has no keys down. */
struct term_keyboard_state {
    uint64_t down[(TERM_KEY_COUNT + 63) / 64];
};

/* Record a press, repeat, or release in s. */
TERM_API void term_keyboard_update(struct term_keyboard_state *s, const struct term_key_event *ev);
TERM_API bool term_keyboard_key_down(const struct term_keyboard_state *s, enum term_key key);

/* Kitty keyboard protocol flags, as in term_modes.keyboard. */
enum term_keyboard_flag {
    TERM_KEYBOARD_DISAMBIGUATE = 1,
    TERM_KEYBOARD_EVENT_TYPES = 2,
    TERM_KEYBOARD_ALTERNATE_KEYS = 4,
    TERM_KEYBOARD_ALL_KEYS = 8,
    TERM_KEYBOARD_ASSOCIATED_TEXT = 16,
};

enum term_input_status {
    TERM_INPUT_UNHANDLED = 0,   /* the terminal does not use the event */
    TERM_INPUT_CONSUMED,        /* the terminal uses the event but sends nothing */
    TERM_INPUT_BYTES,           /* send the len bytes in buf to the program */
    TERM_INPUT_BUFFER_FULL,     /* buf is too small; len is 0 */
};

struct term_input_result {
    size_t len;
    enum term_input_status status;
};

#ifdef __cplusplus
}
#endif

#endif /* TERM_INPUT_TYPES_H */