/***************************************************************************
 *   Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO,                    *
 *                         Niccolò Izzo IU2KIN                             *
 *                         Frederik Saraci IU2NRO                          *
 *                         Silvano Seva IU2KWO                             *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, see <http://www.gnu.org/licenses/>   *
 ***************************************************************************/

/*
 * The graphical user interface (GUI) works by splitting the screen in 
 * horizontal rows, with row height depending on vertical resolution.
 * 
 * The general screen layout is composed by an upper status bar at the
 * top of the screen and a lower status bar at the bottom.
 * The central portion of the screen is filled by two big text/number rows
 * And a small row.
 *
 * Below is shown the row height for two common display densities.
 *
 *        160x128 display (MD380)            Recommended font size
 *      ┌─────────────────────────┐
 *      │  top_status_bar (16 px) │  8 pt font with 4 px vertical padding
 *      ├─────────────────────────┤
 *      │      Line 1 (32px)      │  16 pt font with 8 px vertical padding
 *      │                         │
 *      │      Line 2 (32px)      │  16 pt font with 8 px vertical padding
 *      │                         │
 *      │      Line 3 (32px)      │  16 pt font with 8 px vertical padding
 *      │                         │
 *      ├─────────────────────────┤
 *      │bottom_status_bar (16 px)│  8 pt font with 4 px vertical padding
 *      └─────────────────────────┘
 *
 *         128x64 display (GD-77)
 *      ┌─────────────────────────┐
 *      │  top_status_bar (8 px)  │  8 pt font without vertical padding
 *      ├─────────────────────────┤
 *      │      Line 1 (20px)      │  16 pt font with 2 px vertical padding
 *      │      Line 2 (20px)      │  16 pt font with 2 px vertical padding
 *      │      Line 3 (8px)       │  8 pt font without vertical padding
 *      ├─────────────────────────┤
 *      │ bottom_status_bar (8 px)│  8 pt font without vertical padding
 *      └─────────────────────────┘
 *
 *         128x48 display (RD-5R)
 *      ┌─────────────────────────┐
 *      │  top_status_bar (8 px)  │  8 pt font without vertical padding
 *      ├─────────────────────────┤
 *      │      Line 1 (20px)      │  16 pt font with 2 px vertical padding
 *      │      Line 2 (20px)      │  16 pt font with 2 px vertical padding
 *      └─────────────────────────┘
 */

#include <stdio.h>
#include <stdint.h>
#include <ui.h>
#include <delays.h>
#include <graphics.h>
#include <keyboard.h>
#include <platform.h>
#include <hwconfig.h>

typedef struct layout_t
{
    uint16_t top_h;
    uint16_t bottom_h;
    point_t top_pos;
    point_t line1_pos;
    point_t line2_pos;
    point_t line3_pos;
    point_t bottom_pos;
    fontSize_t top_font;
    fontSize_t line1_font;
    fontSize_t line2_font;
    fontSize_t line3_font;
    fontSize_t bottom_font;
} layout_t;

layout_t layout;
bool layout_ready = false;
bool redraw_needed = true;
color_t color_white = {255, 255, 255};
color_t color_grey = {60, 60, 60};
color_t yellow_fab413 = {250, 180, 19};

layout_t _ui_calculateLayout()
{
    // Calculate UI layout depending on vertical resolution
    // Tytera MD380, MD-UV380
    #if SCREEN_HEIGHT > 127

    // Height and padding shown in diagram at beginning of file
    const uint16_t top_h = 16;
    const uint16_t top_pad = 4;
    const uint16_t line1_h = 32;
    const uint16_t line2_h = 32;
    const uint16_t line3_h = 32;
    const uint16_t line_pad = 8;
    const uint16_t bottom_h = top_h;
    const uint16_t bottom_pad = 4;

    // Top bar font: 8 pt
    const fontSize_t top_font = FONT_SIZE_8PT;
    // Middle line fonts: 16 pt
    const fontSize_t line1_font = FONT_SIZE_12PT;
    const fontSize_t line2_font = FONT_SIZE_12PT;
    const fontSize_t line3_font = FONT_SIZE_12PT;
    // Bottom bar font: 8 pt
    const fontSize_t bottom_font = FONT_SIZE_8PT;

    // Radioddity GD-77
    #elif SCREEN_HEIGHT > 63

    // Height and padding shown in diagram at beginning of file
    const uint16_t top_h = 8;
    const uint16_t top_pad = 0;
    const uint16_t line1_h = 20;
    const uint16_t line2_h = 20;
    const uint16_t line3_h = 0;
    const uint16_t line_pad = 2;
    const uint16_t bottom_h = top_h;
    const uint16_t bottom_pad = 0;

    // Top bar font: 8 pt
    const fontSize_t top_font = FONT_SIZE_1;
    // Middle line fonts: 16, 16, 8 pt
    const fontSize_t line1_font = FONT_SIZE_3;
    const fontSize_t line2_font = FONT_SIZE_3;
    const fontSize_t line3_font = FONT_SIZE_1;
    // Bottom bar font: 8 pt
    const fontSize_t bottom_font = FONT_SIZE_1;

    #elif SCREEN_HEIGHT > 47

    // Height and padding shown in diagram at beginning of file
    const uint16_t top_h = 8;
    const uint16_t top_pad = 0;
    const uint16_t line1_h = 20;
    const uint16_t line2_h = 20;
    const uint16_t line3_h = 0;
    const uint16_t line_pad = 2;
    const uint16_t bottom_h = 0;
    const uint16_t bottom_pad = 0;

    // Top bar font: 8 pt
    const fontSize_t top_font = FONT_SIZE_1;
    // Middle line fonts: 16, 16
    const fontSize_t line1_font = FONT_SIZE_3;
    const fontSize_t line2_font = FONT_SIZE_3;
    // Not present in this UI
    const fontSize_t line3_font = 0;
    const fontSize_t bottom_font = 0;

    #else
    #error Unsupported vertical resolution!
    #endif

    // Calculate printing positions
    point_t top_pos    = {0, top_h - top_pad};
    point_t line1_pos  = {0, top_h + line1_h - line_pad};
    point_t line2_pos  = {0, top_h + line1_h + line2_h - line_pad};
    point_t line3_pos  = {0, top_h + line1_h + line2_h + line3_h - line_pad};
    point_t bottom_pos = {0, top_h + line1_h + line2_h + line3_h + bottom_h - bottom_pad};

    layout_t new_layout =
    {
        top_h,
        bottom_h,
        top_pos,
        line1_pos,
        line2_pos,
        line3_pos,
        bottom_pos,
        top_font,
        line1_font,
        line2_font,
        line3_font,
        bottom_font,
    };
    return new_layout;
}

void _ui_drawBackground()
{
    // Print top bar line of 1 pixel height
    gfx_drawHLine(layout.top_h, 1, color_grey);
    // Print bottom bar line of 1 pixel height
    gfx_drawHLine(SCREEN_HEIGHT - layout.bottom_h - 1, 1, color_grey);
}

void _ui_drawTopBar(state_t* state)
{
    // Print clock on top bar
    char clock_buf[6] = "";
    snprintf(clock_buf, sizeof(clock_buf), "%02d:%02d", state->time.hour, 
             state->time.minute);
    gfx_print(layout.top_pos, clock_buf, layout.top_font, TEXT_ALIGN_CENTER,
              color_white);

    // Print battery voltage on top bar, use 4 px padding
    // TODO: Replace with battery icon
    char bat_buf[6] = "";
    snprintf(bat_buf, sizeof(bat_buf), "%02.1fV ", state->v_bat);
    gfx_print(layout.top_pos, bat_buf, layout.top_font, TEXT_ALIGN_RIGHT,
              color_white);
}

void _ui_drawVFO(state_t* state)
{
    // Print VFO frequencies
    char freq_buf[20] = "";
    snprintf(freq_buf, sizeof(freq_buf), "Rx: %03d.%05d", 
             state->channel.rx_frequency/1000000,
             state->channel.rx_frequency%1000000);
    gfx_print(layout.line2_pos, freq_buf, layout.line1_font, TEXT_ALIGN_CENTER,
              color_white);
    snprintf(freq_buf, sizeof(freq_buf), "Tx: %03d.%05d", 
             state->channel.tx_frequency/1000000,
             state->channel.tx_frequency%1000000);
    gfx_print(layout.line3_pos, freq_buf, layout.line2_font, TEXT_ALIGN_CENTER,
              color_white);
}

void _ui_drawBottomBar()
{
    // Print OpenRTX on bottom bar
    char bottom_buf[8] = "OpenRTX";
    gfx_print(layout.bottom_pos, bottom_buf, layout.bottom_font,
              TEXT_ALIGN_CENTER, color_white);
}

bool ui_drawMainScreen(state_t last_state)
{
    bool screen_update = false;
    // Total GUI redraw
    if(redraw_needed)
    {
        gfx_clearScreen();
        _ui_drawBackground();
        _ui_drawTopBar(&last_state);
        _ui_drawVFO(&last_state);
        _ui_drawBottomBar();
        screen_update = true;
    }
    // Partial GUI redraw
    // TODO: until gfx_clearRows() is implemented, we need to redraw everything
    else
    {
        gfx_clearScreen();
        _ui_drawBackground();
        _ui_drawTopBar(&last_state);
        _ui_drawVFO(&last_state);
        _ui_drawBottomBar();
        screen_update = true;
    }
    return screen_update;
}

void ui_init()
{
    redraw_needed = true;
    layout = _ui_calculateLayout();
    layout_ready = true;
}

void ui_drawSplashScreen()
{
    point_t splash_origin = {0, SCREEN_HEIGHT / 2 + 6};
    gfx_clearScreen();
    gfx_print(splash_origin, "OpenRTX", FONT_SIZE_12PT, TEXT_ALIGN_CENTER,
              yellow_fab413);
}

void ui_drawSplashScreen2()
{
    point_t splash_origin = {0, SCREEN_HEIGHT / 2 - 6};
    gfx_clearScreen();
    gfx_print(splash_origin, "O P N\nR T X", FONT_SIZE_12PT, TEXT_ALIGN_CENTER,
              yellow_fab413);
}

bool ui_update(state_t last_state, uint32_t keys)
{
    (void) keys;

    if(!layout_ready)
    {
        layout = _ui_calculateLayout();
        layout_ready = true;
    }

    bool screen_update = ui_drawMainScreen(last_state);
    return screen_update;
}

void ui_terminate()
{
}