// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#include <pc/console.h>

// FIXME XXX

//#define _LARGE_SCREEN

#ifndef _LARGE_SCREEN
#   define _MULT 1
#else
#   define _MULT 2
#endif

#define CONSOLE_WIDTH       (80)
#define CONSOLE_HEIGHT      (25)
#define CONSOLE_FONT_SIZE   (16 * _MULT)
#define SCREEN_WIDTH        (9 * CONSOLE_WIDTH * _MULT)
#define SCREEN_HEIGHT       (16 * CONSOLE_HEIGHT * _MULT)

#define _SURF_H             CONSOLE_FONT_SIZE

SDL_Window *scr_win = NULL;
SDL_Renderer *scr_rend = NULL;

TTF_Font *scr_font = NULL;
SDL_Color scr_text_color = { 255, 255, 255, 0 };

char scr_lines[CONSOLE_HEIGHT][CONSOLE_WIDTH+1] = { 0 };
SDL_Texture *scr_texts[CONSOLE_HEIGHT] = { 0 };
SDL_Rect *scr_rects[CONSOLE_HEIGHT] = { 0 };

int csn_x = 0;
int csn_y = 0;

//----------------------------------------------------------------------------//

void console_init(ctx_t *ctx)
{
    if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) < 0)
    {
        logerr("Couldn't initialize SDL: %s", SDL_GetError());
        die(-1);
    }

    SDL_CreateWindowAndRenderer(SCREEN_WIDTH, SCREEN_HEIGHT, 0,
                &scr_win, &scr_rend);

    SDL_SetRenderDrawColor(scr_rend, 20, 20, 20, 0);

    if (scr_win == NULL || scr_rend == NULL)
    {
        logerr("Couldn't create SDL screen window/renderer: %s", SDL_GetError());
        die(-1);
    }

    TTF_Init();

    scr_font = TTF_OpenFont
        ("fs/csfont.ttf", CONSOLE_FONT_SIZE);

    if (scr_font == NULL)
    {
        logerr("Couldn't open the FreeMono font\n");
        die(-1);
    }

    size_t y;
    for (y = 0; y < CONSOLE_HEIGHT; y++)
    {
        memset(scr_lines[y], ' ', CONSOLE_WIDTH);
        scr_lines[y][CONSOLE_WIDTH] = 0;
    }

    SDL_RenderClear(scr_rend);
    SDL_RenderPresent(scr_rend);
}

//----------------------------------------------------------------------------//

void console_exit(ctx_t *ctx)
{
    size_t y;

    for (y = 0; y < CONSOLE_HEIGHT; y++)
        if (scr_texts[y] != NULL)
        {
            if (scr_rects[y])
                free(scr_rects[y]);

            SDL_DestroyTexture(scr_texts[y]);
        }

    if (scr_rend)
        SDL_DestroyRenderer(scr_rend);

    if (scr_win)
        SDL_DestroyWindow(scr_win);

    TTF_Quit();
    SDL_Quit();
}

//----------------------------------------------------------------------------//

void console_render(ctx_t *ctx)
{
    size_t y;

    SDL_RenderClear(scr_rend);

    for (y = 0; y < CONSOLE_HEIGHT; y++)
        if (scr_texts[y] != NULL && scr_rects[y] != NULL)
            SDL_RenderCopy(scr_rend, scr_texts[y],
                    NULL, scr_rects[y]);

    SDL_RenderPresent(scr_rend);
}

//----------------------------------------------------------------------------//

void console_update(ctx_t *ctx)
{
    SDL_Event evt;

    if (__builtin_expect(SDL_PollEvent(&evt) == 1, 0))
    {
        switch (evt.type)
        {
            case SDL_QUIT:
                die(0);
                break;

            case SDL_KEYDOWN:
                console_handle_input(ctx, evt.key.keysym.sym);
                break;
        }
    }
}

//----------------------------------------------------------------------------//

void console_clear(ctx_t *ctx)
{
    csn_y = CONSOLE_HEIGHT - 1;

    for (int i = 0; i < CONSOLE_HEIGHT; i++)
        console_putc(ctx, '\n');

    csn_x = csn_y = 0;
}

//----------------------------------------------------------------------------//

void console_putat(ctx_t *ctx, char ch, int x, int y)
{
    SDL_Surface *surf;

    //trace("putat: %c %d %d\n", ch, x, y);

    if (y >= CONSOLE_HEIGHT || x >= CONSOLE_WIDTH)
    {
        logerr("console_putat: position out of range (%d,%d)", x, y);
        return;
    }

    scr_lines[y][x] = ch;

    surf = TTF_RenderText_Solid(scr_font, scr_lines[y], scr_text_color);

    if (!surf)
    {
        logerr("console_putat: couldn't render TTF font: "
                "(%d,%d) '%c'\nError: '%s'\n", x, y, ch, SDL_GetError());
        die(-1);
    }

    if (scr_texts[y])
    {
        if (scr_rects[y])
        {
            free(scr_rects[y]);
            scr_rects[y] = NULL;
        }

        SDL_DestroyTexture(scr_texts[y]);
    }

    scr_texts[y] = SDL_CreateTextureFromSurface(scr_rend, surf);
    scr_rects[y] = malloc(sizeof(SDL_Rect));

    if (scr_texts[y] == NULL)
    {
        logerr("console_putat: couldn't create texture from surface: "
                "(%d,%d) '%c'\nError: '%s'\n", x, y, ch, SDL_GetError());
        SDL_FreeSurface(surf);
        die(-1);
    }

    if (scr_rects[y] == NULL)
    {
        logerr("console_putat: not enough memory\n");
        SDL_FreeSurface(surf);
        SDL_DestroyTexture(scr_texts[y]);
        die(-1);
    }

    scr_rects[y]->x = 0;
    scr_rects[y]->y = y * surf->h;
    scr_rects[y]->w = surf->w;
    scr_rects[y]->h = surf->h;

    SDL_FreeSurface(surf);

    console_render(ctx);
}

//----------------------------------------------------------------------------//

void console_putc(ctx_t *ctx, char ch)
{
    size_t y;

    switch (ch)
    {
        case '\n':
            csn_x = CONSOLE_WIDTH;
            break;

        case '\r':
            csn_x = 0;
            return;

        case '\b':
            if (csn_x == 0)
                return;

            csn_x--;
            console_putat(ctx, ' ', csn_x, csn_y);
            break;

        default:
            console_putat(ctx, ch, csn_x, csn_y);
            csn_x++;
            break;
    }

    if (csn_x == CONSOLE_WIDTH)
    {
        csn_x = 0;
        csn_y++;
    }

    if (csn_y == CONSOLE_HEIGHT)
    {
        csn_y--;
        memmove(scr_lines, &scr_lines[1],
               (CONSOLE_HEIGHT - 1) * CONSOLE_WIDTH);

        memset(&scr_lines[CONSOLE_HEIGHT-1], ' ', CONSOLE_WIDTH);
        scr_lines[CONSOLE_HEIGHT-1][CONSOLE_WIDTH] = 0;

        if (scr_texts[0] != NULL)
        {
            SDL_DestroyTexture(scr_texts[0]);
            scr_texts[0] = NULL;
        }

        memmove(scr_texts, &scr_texts[1],
               (CONSOLE_HEIGHT - 1) * sizeof(SDL_Texture *));

        scr_texts[CONSOLE_HEIGHT-1] = NULL;

        if (scr_rects[0] != NULL)
        {
            free(scr_rects[0]);
            scr_rects[0] = NULL;
        }

        memmove(scr_rects, &scr_rects[1],
               (CONSOLE_HEIGHT - 1) * sizeof(SDL_Rect *));

        scr_rects[CONSOLE_HEIGHT-1] = NULL;

        for (y = 0; y < CONSOLE_HEIGHT-1; y++)
            if (scr_rects[y] != NULL)
            {
                scr_rects[y]->y -= _SURF_H; // surf->h
            }

        console_render(ctx);
    }
}

//----------------------------------------------------------------------------//