#ifndef HANDMADE_H_SENTRY
#define HANDMADE_H_SENTRY

#include "helpers.h"

#include "handmade_tile.h"

#include <assert.h>

/* --------------------------------------------------------------------- */
/* NOTE: Servcies that the platform layer provides to the game.          */
/* --------------------------------------------------------------------- */

struct thread_context {
    int placeholder;
};

struct debug_read_file_result {
    unsigned int contents_size;
    void *contents;
};

struct debug_read_file_result
    debug_platform_read_entire_file(struct thread_context *thread,
                                    const char *filename);
int debug_platform_write_entire_file(struct thread_context *thread,
                                     const char *filename,
                                     unsigned int memory_size,
                                     void *memory);
void debug_platform_free_file_memory(struct thread_context *thread,
                                     void *memory);

struct game_offscreen_buffer game_offscreen_buffer;
void set_program_icon(struct game_offscreen_buffer *program_icon);

/* --------------------------------------------------------------------- */
/* NOTE: Servcies that the game provides to the platform layer.          */
/* --------------------------------------------------------------------- */

struct game_offscreen_buffer {
    /* Pixels are always 32-bit and have the bytes in BGRX (little-endian). */
    void *memory;
    int width;
    int height;
    int bytes_per_pixel;
    int pitch;
};

struct game_sound_output_buffer {
    int samples_per_second;
    int sample_count;
    short *samples;
};

struct game_button_state {
    int half_transition_count;
    int ended_down;
};

struct game_controller_input {
    int is_connected;
    int is_analog;

    float stick_average_x;
    float stick_average_y;

    union {
        struct game_button_state buttons[12];
        struct {
            struct game_button_state move_up;
            struct game_button_state move_down;
            struct game_button_state move_left;
            struct game_button_state move_right;

            struct game_button_state action_up;
            struct game_button_state action_down;
            struct game_button_state action_left;
            struct game_button_state action_right;

            struct game_button_state left_shoulder;
            struct game_button_state right_shoulder;

            struct game_button_state start;
            struct game_button_state back;

            /* NOTE: All buttons must be added above this line. */

            struct game_button_state terminator;
        } s;
    } u;
};

struct game_input {
    struct game_button_state mouse_buttons[5];
    int mouse_x, mouse_y, mouse_z; /* NOTE: MouseZ is the wheel. */

    float dt_for_frame;

    struct game_controller_input controllers[5];
};

struct game_controller_input *GetController(struct game_input *Input,
                                            int ControllerIndex)
{
    struct game_controller_input *Result;

    assert((unsigned int)ControllerIndex < ARRAY_SIZE(Input->controllers));
    Result = &(Input->controllers[ControllerIndex]);
    return Result;
}

struct game_memory {
    int is_initialized;

    unsigned long long permanent_storage_size;
    void *permanent_storage; /* WARNING: This memory is REQUIRED to be zero 
                                initialized!!! (Done by the OS layer.) */

    unsigned long long transient_storage_size;
    void *transient_storage; /* WARNING: This memory is REQUIRED to be zero
                                initialized!!! (Done by the OS layer.) */

    struct debug_read_file_result
        (*debug_platform_read_entire_file)(struct thread_context *Thread,
                                           const char *);
    int (*debug_platform_write_entire_file)(struct thread_context *Thread,
                                            const char *, unsigned int,
                                            void *);
    void (*debug_platform_free_file_memory)(struct thread_context *Thread,
                                            void *);
    void (*SetProgramIcon)(struct game_offscreen_buffer *ProgramIcon);
};

/*struct game_clocks {
    unsigned long long Ticks;
    float SecondsElapsed;
};*/

#if OS_WINDOWS
__declspec(dllexport)
#endif
void UpdateAndRender(struct thread_context *Thread,
                     struct game_memory *Memory,
                     struct game_input *Input,
                     struct game_offscreen_buffer *Buffer,
                     struct game_sound_output_buffer *SoundBuffer);

/*
 *
 */

struct memory_arena {
    unsigned long long size;
    unsigned char *base;
    unsigned long long used;
};

static void InitializeArena(struct memory_arena *arena,
                            unsigned long long size, unsigned char *base)
{
    arena->size = size;
    arena->base = base;
    arena->used = 0;
}

#define PUSH_STRUCT(Arena, type) (type *)PushSize_(Arena, sizeof(type))
#define PUSH_ARRAY(Arena, Count, type) \
    (type *)PushSize_(Arena, (Count)*sizeof(type))
static void *PushSize_(struct memory_arena *Arena, unsigned long long Size)
{
    void *Result;

    assert((Arena->used + Size) <= Arena->size);

    Result = (void *)(Arena->base + Arena->used);
    Arena->used += Size;
    return Result;
}

struct world {
    struct tile_map *tile_map;
};

struct loaded_bitmap {
    int width;
    int height;
    unsigned int *pixels;
};

struct hero_bitmaps {
    int align_x;
    int align_y;

    struct loaded_bitmap head;
    struct loaded_bitmap cape;
    struct loaded_bitmap torso;
};

struct entity {
    int exists;
    struct tile_map_position p;
    struct v2 dp; /* velocity */
    unsigned int facing_direction;
    float height, width;
};

struct game_state {
    struct game_offscreen_buffer program_icon;
    struct loaded_bitmap program_icon_bmp;

    struct memory_arena world_arena;
    struct world *world;

    unsigned int camera_following_entity_index;
    struct tile_map_position camera_p;

    /*unsigned int
     *PlayerIndexForController[ARRAY_SIZE(((game_input *)0)->Controllers];*/
    unsigned int player_index_for_controller[5];
    unsigned int entity_count;
    struct entity entities[256];

    struct loaded_bitmap backdrop;

    struct hero_bitmaps hero_bitmaps[4];

    struct v2 rect_pos;
};

#endif