/*
    ptrnt - print labels on linux
    Copyright (C) 2025  Moritz Martinius

    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 <https://www.gnu.org/licenses/>.

 */

#include "P700Printer.hpp"

#include <spdlog/spdlog.h>

#include <cassert>
#include <cstdint>
#include <iterator>
#include <memory>
#include <thread>
#include <vector>

#include "../graphics/Bitmap.hpp"
#include "../graphics/Monochrome.hpp"
#include "../libusbwrap/LibUsbTypes.hpp"
#include "spdlog/fmt/bin_to_hex.h"

namespace ptprnt::printer {

const PrinterInfo P700Printer::mInfo = {.driverName = "P700",
                                        .name       = "Brother P-touch P700",
                                        .version    = "v1.0",
                                        .usbId{0x04f9, 0x2061},
                                        .pixelLines = 128};

P700Printer::~P700Printer() {
    P700Printer::detachUsbDevice();
    if (mUsbHndl) {
        mUsbHndl->close();
    }
}

const std::string_view P700Printer::getDriverName() {
    return mInfo.driverName;
}

const std::string_view P700Printer::getName() {
    return mInfo.name;
}

const std::string_view P700Printer::getVersion() {
    return mInfo.version;
}

const PrinterInfo P700Printer::getPrinterInfo() {
    return mInfo;
}

const PrinterStatus P700Printer::getPrinterStatus() {
    using namespace std::chrono_literals;
    send(p700::commands::GET_STATUS);

    int tx    = 0;
    int tries = 0;
    std::vector<uint8_t> recvBuf(32);
    while (tries++ < MAX_TRIES_GET_STATUS) {
        std::this_thread::sleep_for(100ms);
        mUsbHndl->bulkTransfer(p700::commands::PRINTER_INFO[0], recvBuf, &tx, 0);
    }

    return PrinterStatus{.tapeWidthMm = recvBuf[10]};
}

const libusbwrap::usbId P700Printer::getUsbId() {
    return mInfo.usbId;
}

bool P700Printer::attachUsbDevice(std::shared_ptr<libusbwrap::IUsbDevice> usbHndl) {
    if (!usbHndl->open()) {
        spdlog::error("Unable to open USB device: {}", usbHndl->getLastErrorString());
        return false;
    }

    if (!usbHndl->detachKernelDriver(0)) {

        spdlog::error("Device is already in use or couldn't be detached from kernel: {}",
                      usbHndl->getLastErrorString());
        return false;
    }

    if (!usbHndl->claimInterface(0)) {
        spdlog::error("Could not claim interface 0: {}", usbHndl->getLastErrorString());
        return false;
    }

    mUsbHndl = std::move(usbHndl);
    return true;
}

bool P700Printer::detachUsbDevice() {
    if (!mUsbHndl) {
        spdlog::warn("No device to detach...");
        return true;
    }
    if (!mUsbHndl->releaseInterface(0)) {
        spdlog::error("Could not release interface 0: {}", mUsbHndl->getLastErrorString());
        return false;
    }
    return true;
}

bool P700Printer::printBitmap(const graphics::Bitmap<graphics::ALPHA8>& bitmap) {
    // Convert bitmap to MonochromeData and delegate to printMonochromeData
    auto pixels   = bitmap.getPixelsCpy();
    auto mono     = graphics::Monochrome(pixels, bitmap.getWidth(), bitmap.getHeight());
    auto monoData = mono.get();

    return printMonochromeData(monoData);
}

bool P700Printer::printMonochromeData(const graphics::MonochromeData& data) {
    // Send initialization sequence
    // The INITIALIZE command needs to be sent as a 128-byte packet with ESC @ at the end
    std::vector<uint8_t> initCmd(128, 0x00);
    initCmd[126] = p700::commands::INITIALIZE[0];  // ESC
    initCmd[127] = p700::commands::INITIALIZE[1];  // @
    send(initCmd);

    // Status is already queried in getPrinterStatus()
    send(p700::commands::PRINT_MODE);
    send(p700::commands::AUTO_STATUS);
    send(p700::commands::MODE_SETTING);

    // Send raster data row by row in reverse order (bottom to top)
    // The printer feeds tape as it prints, so first row sent appears at the end
    for (int row = data.height - 1; row >= 0; row--) {
        std::vector<uint8_t> rowData;

        // Extract row data byte by byte
        for (uint32_t col = 0; col < data.width; col += 8) {
            uint8_t byte = 0;
            for (int bit = 0; bit < 8 && (col + bit) < data.width; bit++) {
                if (data.getBit(col + bit, row)) {
                    byte |= (1 << (7 - bit));
                }
            }
            rowData.push_back(byte);
        }

        // Build raster line command: G + length_high + 0x00 + length_low + data
        std::vector<uint8_t> buf;
        buf.push_back(0x47);                         // 'G' command
        buf.push_back((rowData.size() + 1) & 0xFF);  // length + 1 (low byte)
        buf.push_back(0x00);                         // high byte (always 0 for our data size)
        buf.push_back((rowData.size() - 1) & 0xFF);  // length - 1
        buf.insert(buf.end(), rowData.begin(), rowData.end());

        if (!send(buf)) {
            spdlog::error("Error sending raster line {} to printer", row);
            return false;
        }
    }

    // Send print finalization commands
    send(p700::commands::EJECT);

    return true;
}

bool P700Printer::printLabel(std::unique_ptr<graphics::ILabel> label) {
    // Convert label directly to MonochromeData
    // getRaw() returns data in Cairo surface coordinates matching getWidth() × getHeight()
    auto pixels = label->getRaw();

    // Create monochrome data in landscape orientation (as stored in Cairo surface)
    auto mono = graphics::Monochrome(pixels, label->getWidth(), label->getHeight(), graphics::Orientation::LANDSCAPE);
    auto monoData = mono.get();

    // Transform to portrait orientation for printing
    monoData.transformTo(graphics::Orientation::PORTRAIT);

    spdlog::debug("Label surface was {}x{}, after transform to portrait: {}x{}", label->getWidth(), label->getHeight(),
                  monoData.width, monoData.height);

    return printMonochromeData(monoData);
}

bool P700Printer::print() {
    send(p700::commands::LF);
    send(p700::commands::FF);
    send(p700::commands::EJECT);
    return true;
}

bool P700Printer::send(const std::vector<uint8_t>& data) {

    if (mUsbHndl == nullptr || data.size() > 128) {
        spdlog::error("Invalid device handle or invalid data.");
        return false;
    }

    spdlog::trace("USB Tx → 0x02 {:03d} bytes: {:Xn}", data.size(), spdlog::to_hex(data));
#ifdef USB_TRACE_ONLY
    // Trace mode: Log the data that would be sent without actually sending it
    return true;
#else
    int tx = 0;

    if (!mUsbHndl->bulkTransfer(0x02, data, &tx, 0)) {
        spdlog::error("Error writing command to Printer: {}", mUsbHndl->getLastErrorString());
        return false;
    }

    assert(tx > 0);
    if (static_cast<std::uint32_t>(tx) != data.size()) {
        spdlog::error("Could not transfer all data via USB bulk transfer. Only sent {} of {} bytes", tx, data.size());
        return false;
    }

    return true;
#endif
}

bool P700Printer::init() {
    std::vector<uint8_t> cmd(102);
    cmd[100] = 0x1b; /* ESC */
    cmd[101] = 0x40; /* @ */
    return send(cmd);
}
}  // namespace ptprnt::printer