/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2016 Furrtek
 *
 * This file is part of PortaPack.
 *
 * 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 2, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "ui_sstvtx.hpp"
#include "string_format.hpp"

#include "portapack.hpp"
#include "hackrf_hal.hpp"

#include <cstring>
#include <stdio.h>

using namespace portapack;

namespace ui::external_app::sstvtx {

void SSTVTXView::focus() {
    if (file_error)
        nav_.display_modal("No files", "No valid bitmaps\nin /sstv directory.", ABORT);
    else
        options_bitmaps.focus();
}

void SSTVTXView::read_boundary(uint8_t* const buffer, uint32_t position, uint32_t length) {
    uint32_t to_read, split;
    uint8_t* buffer_copy = buffer;

    bmp_file.seek(position);

    // FatFS bug workaround: we can't read across 512 byte boundaries ?!
    while (length) {
        to_read = (length <= 512) ? length : 512;
        if ((position & 512) != ((position + to_read - 1) & 512)) {
            // Crossing: do 2 reads before and after the boundary
            split = 512 - (position & 511);
            bmp_file.read(buffer_copy, split);
            bmp_file.read(buffer_copy + split, to_read - split);
        } else {
            // No crossing, just read normally
            bmp_file.read(buffer_copy, to_read);
        }
        position += to_read;
        buffer_copy += to_read;
        length -= to_read;
    }
}

void SSTVTXView::paint(Painter&) {
    ui::Color line_buffer[160];
    Coord line;
    uint32_t data_idx, bmp_px, pixel_idx;

    data_idx = bmp_header.image_data;

    for (line = 0; line < (256 / 2); line++) {
        // Buffer a whole line
        read_boundary(pixels_buffer, data_idx, sizeof(pixels_buffer));

        for (bmp_px = 0; bmp_px < 160; bmp_px++) {
            pixel_idx = bmp_px * 3 * 2;
            line_buffer[bmp_px] = Color(pixels_buffer[pixel_idx + 2],
                                        pixels_buffer[pixel_idx + 1],
                                        pixels_buffer[pixel_idx + 0]);
        }
        portapack::display.render_line({16, 80 + 128 - line}, 160, line_buffer);
        data_idx += sizeof(pixels_buffer) * 2;
    }
}

SSTVTXView::~SSTVTXView() {
    transmitter_model.disable();
    baseband::shutdown();
}

void SSTVTXView::prepare_scanline() {
    sstv_scanline scanline_buffer;
    uint32_t component, pixel_idx;
    uint8_t offset;

    if (scanline_counter >= (256 * 3)) {
        progressbar.set_value(0);
        transmitter_model.disable();
        options_bitmaps.set_focusable(true);
        tx_view.set_transmitting(false);
        return;
    }

    progressbar.set_value(scanline_counter);

    // Scottie 2 scanline:
    // (First line: 1200 9ms)
    // 1500 1.5ms
    // Green
    // 1500 1.5ms
    // Blue
    // 1200 9ms
    // 1500 1.5ms
    // Red
    // Scanline time: 88.064ms (275.2us/pixel @ 320 pixels/line)

    component = scanline_counter % 3;

    if ((!scanline_counter && tx_sstv_mode->sync_on_first) || (component == tx_sstv_mode->sync_index)) {
        // Sync
        scanline_buffer.start_tone.frequency = SSTV_F2D(1200);
        scanline_buffer.start_tone.duration = tx_sstv_mode->samples_per_sync;
        scanline_buffer.gap_tone.frequency = SSTV_F2D(1500);
        scanline_buffer.gap_tone.duration = tx_sstv_mode->samples_per_gap;
    } else {
        // Regular scanline
        scanline_buffer.start_tone.duration = 0;
        if (tx_sstv_mode->gaps) {
            scanline_buffer.gap_tone.frequency = SSTV_F2D(1500);
            scanline_buffer.gap_tone.duration = tx_sstv_mode->samples_per_gap;
        }
    }

    if (!component) {
        // Read a new line
        read_boundary(pixels_buffer,
                      bmp_header.image_data + ((255 - (scanline_counter / 3)) * sizeof(pixels_buffer)),
                      sizeof(pixels_buffer));
    }

    offset = component_map[component];
    for (uint32_t bmp_px = 0; bmp_px < 320; bmp_px++) {
        pixel_idx = bmp_px * 3;
        scanline_buffer.luma[bmp_px] = pixels_buffer[pixel_idx + offset];
    }

    baseband::set_fifo_data((int8_t*)&scanline_buffer);

    scanline_counter++;
}

void SSTVTXView::start_tx() {
    // The baseband SSTV TX code (proc_sstv) has a 2-scanline buffer. It is preloaded before
    // TX start, and asks for fill-up when a new scanline starts being read. This should
    // leave enough time for the code in prepare_scanline() before it ends.
    scanline_counter = 0;
    prepare_scanline();  // Preload one scanline

    transmitter_model.set_baseband_bandwidth(1'750'000);  // Min TX LPF 1M75, same spectrum as previous fw 1.7.4
    transmitter_model.enable();

    baseband::set_sstv_data(
        tx_sstv_mode->vis_code,
        tx_sstv_mode->samples_per_pixel);

    // Todo: Find a better way to prevent user from changing bitmap during tx
    options_bitmaps.set_focusable(false);
    tx_view.focus();
}

void SSTVTXView::on_bitmap_changed(const size_t index) {
    bmp_file.open("/sstv/" + bitmaps[index].string());
    bmp_file.read(&bmp_header, sizeof(bmp_header));
    set_dirty();
}

void SSTVTXView::on_mode_changed(const size_t index) {
    sstv_color_seq tx_color_sequence;

    tx_sstv_mode = &sstv_modes[index];

    tx_color_sequence = sstv_modes[index].color_sequence;
    if (tx_color_sequence == SSTV_COLOR_RGB) {
        component_map[0] = 2;
        component_map[1] = 1;
        component_map[2] = 0;
    } else if (tx_color_sequence == SSTV_COLOR_GBR) {
        component_map[0] = 1;
        component_map[1] = 0;
        component_map[2] = 2;
    }

    progressbar.set_max(sstv_modes[index].lines * 3);
}

SSTVTXView::SSTVTXView(
    NavigationView& nav)
    : nav_(nav) {
    std::vector<std::filesystem::path> file_list;
    using option_t = std::pair<std::string, int32_t>;
    using options_t = std::vector<option_t>;
    options_t bitmap_options;
    options_t mode_options;
    uint32_t c;

    // Search for valid bitmaps
    file_list = scan_root_files(u"/sstv", u"*.bmp");
    if (!file_list.size()) {
        file_error = true;
        return;
    }
    for (const auto& file_name : file_list) {
        if (!bmp_file.open("/sstv/" + file_name.string()).is_valid()) {
            bmp_file.read(&bmp_header, sizeof(bmp_header));
            if ((bmp_header.signature == 0x4D42) &&  // "BM"
                (bmp_header.width == 320) &&         // Must be exactly 320x256 pixels for now
                (bmp_header.height == 256) &&
                (bmp_header.planes == 1) &&
                (bmp_header.bpp == 24) &&         // 24 bpp only
                (bmp_header.compression == 0)) {  // No compression
                bitmaps.push_back(file_name);
            }
        }
    }
    if (!bitmaps.size()) {
        file_error = true;
        return;
    }

    // Maybe this could be merged with proc_tones ? Pretty much the same except lots
    // of different tones (256+)
    // baseband::run_image(portapack::spi_flash::image_tag_sstv_tx);
    baseband::run_prepared_image(portapack::memory::map::m4_code.base());

    add_children({&labels,
                  &options_bitmaps,
                  &options_modes,
                  &progressbar,
                  &tx_view});

    // Populate file list
    for (const auto& bitmap : bitmaps)
        bitmap_options.emplace_back(bitmap.string().substr(0, 16), 0);
    options_bitmaps.set_options(bitmap_options);

    // Populate mode list
    for (c = 0; c < SSTV_MODES_NB; c++)
        mode_options.emplace_back(sstv_modes[c].name, c);
    options_modes.set_options(mode_options);

    options_bitmaps.on_change = [this](size_t i, int32_t) {
        this->on_bitmap_changed(i);
    };
    options_bitmaps.set_selected_index(0);  // First file
    on_bitmap_changed(0);

    options_modes.on_change = [this](size_t i, int32_t) {
        this->on_mode_changed(i);
    };
    options_modes.set_selected_index(1);  // Scottie 2
    on_mode_changed(1);

    tx_view.on_edit_frequency = [this, &nav]() {
        auto new_view = nav.push<FrequencyKeypadView>(transmitter_model.target_frequency());
        new_view->on_changed = [this](rf::Frequency f) {
            transmitter_model.set_target_frequency(f);
            // NB: The freq field is only updated because TXView's on_show runs again.
        };
    };

    tx_view.on_start = [this]() {
        start_tx();
        tx_view.set_transmitting(true);
    };

    tx_view.on_stop = [this]() {
        baseband::set_sstv_data(0, 0);
        tx_view.set_transmitting(false);
        transmitter_model.disable();
        options_bitmaps.set_focusable(true);
    };
}

}  // namespace ui::external_app::sstvtx