#include "SL1.hpp"
#include "GCode/ThumbnailData.hpp"
#include "libslic3r/Time.hpp"

#include <boost/log/trivial.hpp>
#include <boost/filesystem.hpp>

#include "libslic3r/Zipper.hpp"
#include "libslic3r/SLAPrint.hpp"

#include <sstream>

#include "libslic3r/Exception.hpp"
#include "libslic3r/SlicesToTriangleMesh.hpp"
#include "libslic3r/MarchingSquares.hpp"
#include "libslic3r/ClipperUtils.hpp"
#include "libslic3r/MTUtils.hpp"
#include "libslic3r/PrintConfig.hpp"
#include "libslic3r/SLA/RasterBase.hpp"
#include "libslic3r/miniz_extension.hpp"
#include "libslic3r/PNGReadWrite.hpp"
#include "libslic3r/LocalesUtils.hpp"

#include <boost/property_tree/ini_parser.hpp>
#include <boost/filesystem/path.hpp>
#include <boost/algorithm/string.hpp>

namespace marchsq {

template<> struct _RasterTraits<Slic3r::png::ImageGreyscale> {
    using Rst = Slic3r::png::ImageGreyscale;

    // The type of pixel cell in the raster
    using ValueType = uint8_t;

    // Value at a given position
    static uint8_t get(const Rst &rst, size_t row, size_t col)
    {
        return rst.get(row, col);
    }

    // Number of rows and cols of the raster
    static size_t rows(const Rst &rst) { return rst.rows; }
    static size_t cols(const Rst &rst) { return rst.cols; }
};

} // namespace marchsq

namespace Slic3r {

namespace {

struct PNGBuffer { std::vector<uint8_t> buf; std::string fname; };
struct ArchiveData {
    boost::property_tree::ptree profile, config;
    std::vector<PNGBuffer> images;
};

static const constexpr char *CONFIG_FNAME  = "config.ini";
static const constexpr char *PROFILE_FNAME = "prusaslicer.ini";

boost::property_tree::ptree read_ini(const mz_zip_archive_file_stat &entry,
                                     MZ_Archive &                    zip)
{
    std::string buf(size_t(entry.m_uncomp_size), '\0');

    if (!mz_zip_reader_extract_file_to_mem(&zip.arch, entry.m_filename,
                                           buf.data(), buf.size(), 0))
        throw Slic3r::FileIOError(zip.get_errorstr());

    boost::property_tree::ptree tree;
    std::stringstream ss(buf);
    boost::property_tree::read_ini(ss, tree);
    return tree;
}

PNGBuffer read_png(const mz_zip_archive_file_stat &entry,
                   MZ_Archive &                    zip,
                   const std::string &             name)
{
    std::vector<uint8_t> buf(entry.m_uncomp_size);

    if (!mz_zip_reader_extract_file_to_mem(&zip.arch, entry.m_filename,
                                           buf.data(), buf.size(), 0))
        throw Slic3r::FileIOError(zip.get_errorstr());

    return {std::move(buf), (name.empty() ? entry.m_filename : name)};
}

ArchiveData extract_sla_archive(const std::string &zipfname,
                                const std::string &exclude)
{
    ArchiveData arch;

    // Little RAII
    struct Arch: public MZ_Archive {
        Arch(const std::string &fname) {
            if (!open_zip_reader(&arch, fname))
                throw Slic3r::FileIOError(get_errorstr());
        }

        ~Arch() { close_zip_reader(&arch); }
    } zip (zipfname);

    mz_uint num_entries = mz_zip_reader_get_num_files(&zip.arch);

    for (mz_uint i = 0; i < num_entries; ++i)
    {
        mz_zip_archive_file_stat entry;

        if (mz_zip_reader_file_stat(&zip.arch, i, &entry))
        {
            std::string name = entry.m_filename;
            boost::algorithm::to_lower(name);

            if (boost::algorithm::contains(name, exclude)) continue;

            if (name == CONFIG_FNAME) arch.config = read_ini(entry, zip);
            if (name == PROFILE_FNAME) arch.profile = read_ini(entry, zip);

            if (boost::filesystem::path(name).extension().string() == ".png") {
                auto it = std::lower_bound(
                    arch.images.begin(), arch.images.end(), PNGBuffer{{}, name},
                    [](const PNGBuffer &r1, const PNGBuffer &r2) {
                        return std::less<std::string>()(r1.fname, r2.fname);
                    });

                arch.images.insert(it, read_png(entry, zip, name));
            }
        }
    }

    return arch;
}

ExPolygons rings_to_expolygons(const std::vector<marchsq::Ring> &rings,
                               double px_w, double px_h)
{
    auto polys = reserve_vector<ExPolygon>(rings.size());

    for (const marchsq::Ring &ring : rings) {
        Polygon poly; Points &pts = poly.points;
        pts.reserve(ring.size());

        for (const marchsq::Coord &crd : ring)
            pts.emplace_back(scaled(crd.c * px_w), scaled(crd.r * px_h));

        polys.emplace_back(poly);
    }

    // TODO: Is a union necessary?
    return union_ex(polys);
}

template<class Fn> void foreach_vertex(ExPolygon &poly, Fn &&fn)
{
    for (auto &p : poly.contour.points) fn(p);
    for (auto &h : poly.holes)
        for (auto &p : h.points) fn(p);
}

void invert_raster_trafo(ExPolygons &                  expolys,
                         const sla::RasterBase::Trafo &trafo,
                         coord_t                       width,
                         coord_t                       height)
{
    if (trafo.flipXY) std::swap(height, width);

    for (auto &expoly : expolys) {
        if (trafo.mirror_y)
            foreach_vertex(expoly, [height](Point &p) {p.y() = height - p.y(); });

        if (trafo.mirror_x)
            foreach_vertex(expoly, [width](Point &p) {p.x() = width - p.x(); });

        expoly.translate(-trafo.center_x, -trafo.center_y);

        if (trafo.flipXY)
            foreach_vertex(expoly, [](Point &p) { std::swap(p.x(), p.y()); });

        if ((trafo.mirror_x + trafo.mirror_y + trafo.flipXY) % 2) {
            expoly.contour.reverse();
            for (auto &h : expoly.holes) h.reverse();
        }
    }
}

struct RasterParams {
    sla::RasterBase::Trafo trafo; // Raster transformations
    coord_t        width, height; // scaled raster dimensions (not resolution)
    double         px_h, px_w;    // pixel dimesions
    marchsq::Coord win;           // marching squares window size
};

RasterParams get_raster_params(const DynamicPrintConfig &cfg)
{
    auto *opt_disp_cols = cfg.option<ConfigOptionInt>("display_pixels_x");
    auto *opt_disp_rows = cfg.option<ConfigOptionInt>("display_pixels_y");
    auto *opt_disp_w    = cfg.option<ConfigOptionFloat>("display_width");
    auto *opt_disp_h    = cfg.option<ConfigOptionFloat>("display_height");
    auto *opt_mirror_x  = cfg.option<ConfigOptionBool>("display_mirror_x");
    auto *opt_mirror_y  = cfg.option<ConfigOptionBool>("display_mirror_y");
    auto *opt_orient    = cfg.option<ConfigOptionEnum<SLADisplayOrientation>>("display_orientation");

    if (!opt_disp_cols || !opt_disp_rows || !opt_disp_w || !opt_disp_h ||
        !opt_mirror_x || !opt_mirror_y || !opt_orient)
        throw MissingProfileError("Invalid SL1 / SL1S file");

    RasterParams rstp;

    rstp.px_w = opt_disp_w->value / (opt_disp_cols->value - 1);
    rstp.px_h = opt_disp_h->value / (opt_disp_rows->value - 1);

    rstp.trafo = sla::RasterBase::Trafo{opt_orient->value == sladoLandscape ?
                                     sla::RasterBase::roLandscape :
                                     sla::RasterBase::roPortrait,
                                 {opt_mirror_x->value, opt_mirror_y->value}};

    rstp.height = scaled(opt_disp_h->value);
    rstp.width  = scaled(opt_disp_w->value);

    return rstp;
}

struct SliceParams { double layerh = 0., initial_layerh = 0.; };

SliceParams get_slice_params(const DynamicPrintConfig &cfg)
{
    auto *opt_layerh = cfg.option<ConfigOptionFloat>("layer_height");
    auto *opt_init_layerh = cfg.option<ConfigOptionFloat>("initial_layer_height");

    if (!opt_layerh || !opt_init_layerh)
        throw MissingProfileError("Invalid SL1 / SL1S file");

    return SliceParams{opt_layerh->getFloat(), opt_init_layerh->getFloat()};
}

std::vector<ExPolygons> extract_slices_from_sla_archive(
    ArchiveData &            arch,
    const RasterParams &     rstp,
    std::function<bool(int)> progr)
{
    auto jobdir = arch.config.get<std::string>("jobDir");
    for (auto &c : jobdir) c = std::tolower(c);

    std::vector<ExPolygons> slices(arch.images.size());

    struct Status
    {
        double          incr, val, prev;
        bool            stop = false;
        tbb::spin_mutex mutex = {};
    } st {100. / slices.size(), 0., 0.};

    tbb::parallel_for(size_t(0), arch.images.size(),
                     [&arch, &slices, &st, &rstp, progr](size_t i) {
        // Status indication guarded with the spinlock
        {
            std::lock_guard<tbb::spin_mutex> lck(st.mutex);
            if (st.stop) return;

            st.val += st.incr;
            double curr = std::round(st.val);
            if (curr > st.prev) {
                st.prev = curr;
                st.stop = !progr(int(curr));
            }
        }

        png::ImageGreyscale img;
        png::ReadBuf rb{arch.images[i].buf.data(), arch.images[i].buf.size()};
        if (!png::decode_png(rb, img)) return;

        uint8_t isoval = 128;
        auto rings = marchsq::execute(img, isoval, rstp.win);
        ExPolygons expolys = rings_to_expolygons(rings, rstp.px_w, rstp.px_h);

        // Invert the raster transformations indicated in the profile metadata
        invert_raster_trafo(expolys, rstp.trafo, rstp.width, rstp.height);

        slices[i] = std::move(expolys);
    });

    if (st.stop) slices = {};

    return slices;
}

} // namespace

ConfigSubstitutions import_sla_archive(const std::string &zipfname, DynamicPrintConfig &out)
{
    ArchiveData arch = extract_sla_archive(zipfname, "png");
    return out.load(arch.profile, ForwardCompatibilitySubstitutionRule::Enable);
}

// If the profile is missing from the archive (older PS versions did not have
// it), profile_out's initial value will be used as fallback. profile_out will be empty on
// function return if the archive did not contain any profile.
ConfigSubstitutions import_sla_archive(
    const std::string &      zipfname,
    Vec2i                    windowsize,
    indexed_triangle_set &           out,
    DynamicPrintConfig &     profile_out,
    std::function<bool(int)> progr)
{
    // Ensure minimum window size for marching squares
    windowsize.x() = std::max(2, windowsize.x());
    windowsize.y() = std::max(2, windowsize.y());

    std::string exclude_entries{"thumbnail"};
    ArchiveData arch = extract_sla_archive(zipfname, exclude_entries);
    DynamicPrintConfig profile_in, profile_use;
    ConfigSubstitutions config_substitutions =
        profile_in.load(arch.profile,
                        ForwardCompatibilitySubstitutionRule::Enable);

    if (profile_in.empty()) { // missing profile... do guess work
        // try to recover the layer height from the config.ini which was
        // present in all versions of sl1 files.
        if (auto lh_opt = arch.config.find("layerHeight");
            lh_opt != arch.config.not_found())
        {
            auto lh_str = lh_opt->second.data();

            size_t pos;
            double lh = string_to_double_decimal_point(lh_str, &pos);
            if (pos) { // TODO: verify that pos is 0 when parsing fails
                profile_out.set("layer_height", lh);
                profile_out.set("initial_layer_height", lh);
            }
        }
    }

    // If the archive contains an empty profile, use the one that was passed as output argument
    // then replace it with the readed profile to report that it was empty.
    profile_use = profile_in.empty() ? profile_out : profile_in;
    profile_out = profile_in;

    RasterParams rstp = get_raster_params(profile_use);
    rstp.win          = {windowsize.y(), windowsize.x()};

    SliceParams slicp = get_slice_params(profile_use);

    std::vector<ExPolygons> slices =
        extract_slices_from_sla_archive(arch, rstp, progr);

    if (!slices.empty())
        out = slices_to_mesh(slices, 0, slicp.layerh, slicp.initial_layerh);

    return config_substitutions;
}

using ConfMap = std::map<std::string, std::string>;

namespace {

std::string to_ini(const ConfMap &m)
{
    std::string ret;
    for (auto &param : m) ret += param.first + " = " + param.second + "\n";
    
    return ret;
}

std::string get_cfg_value(const DynamicPrintConfig &cfg, const std::string &key)
{
    std::string ret;
    
    if (cfg.has(key)) {
        auto opt = cfg.option(key);
        if (opt) ret = opt->serialize();
    }
    
    return ret;    
}

void fill_iniconf(ConfMap &m, const SLAPrint &print)
{
    CNumericLocalesSetter locales_setter; // for to_string
    auto &cfg = print.full_print_config();
    m["layerHeight"]    = get_cfg_value(cfg, "layer_height");
    m["expTime"]        = get_cfg_value(cfg, "exposure_time");
    m["expTimeFirst"]   = get_cfg_value(cfg, "initial_exposure_time");
    m["expUserProfile"] = get_cfg_value(cfg, "material_print_speed") == "slow" ? "1" : "0";
    m["materialName"]   = get_cfg_value(cfg, "sla_material_settings_id");
    m["printerModel"]   = get_cfg_value(cfg, "printer_model");
    m["printerVariant"] = get_cfg_value(cfg, "printer_variant");
    m["printerProfile"] = get_cfg_value(cfg, "printer_settings_id");
    m["printProfile"]   = get_cfg_value(cfg, "sla_print_settings_id");
    m["fileCreationTimestamp"] = Utils::utc_timestamp();
    m["prusaSlicerVersion"]    = SLIC3R_BUILD_ID;
    
    SLAPrintStatistics stats = print.print_statistics();
    // Set statistics values to the printer
    
    double used_material = (stats.objects_used_material +
                            stats.support_used_material) / 1000;
    
    int num_fade = print.default_object_config().faded_layers.getInt();
    num_fade = num_fade >= 0 ? num_fade : 0;
    
    m["usedMaterial"] = std::to_string(used_material);
    m["numFade"]      = std::to_string(num_fade);
    m["numSlow"]      = std::to_string(stats.slow_layers_count);
    m["numFast"]      = std::to_string(stats.fast_layers_count);
    m["printTime"]    = std::to_string(stats.estimated_print_time);

    bool hollow_en = false;
    auto it = print.objects().begin();
    while (!hollow_en && it != print.objects().end())
        hollow_en = (*it++)->config().hollowing_enable;

    m["hollow"] = hollow_en ? "1" : "0";
    
    m["action"] = "print";
}

void fill_slicerconf(ConfMap &m, const SLAPrint &print)
{
    using namespace std::literals::string_view_literals;
    
    // Sorted list of config keys, which shall not be stored into the ini.
    static constexpr auto banned_keys = { 
		"compatible_printers"sv,
        "compatible_prints"sv
    };
    
    assert(std::is_sorted(banned_keys.begin(), banned_keys.end()));
    auto is_banned = [](const std::string &key) {
        return std::binary_search(banned_keys.begin(), banned_keys.end(), key);
    };
    
    auto &cfg = print.full_print_config();
    for (const std::string &key : cfg.keys())
        if (! is_banned(key) && ! cfg.option(key)->is_nil())
            m[key] = cfg.opt_serialize(key);
    
}

} // namespace

std::unique_ptr<sla::RasterBase> SL1Archive::create_raster() const
{
    sla::RasterBase::Resolution res;
    sla::RasterBase::PixelDim   pxdim;
    std::array<bool, 2>         mirror;

    double w  = m_cfg.display_width.getFloat();
    double h  = m_cfg.display_height.getFloat();
    auto   pw = size_t(m_cfg.display_pixels_x.getInt());
    auto   ph = size_t(m_cfg.display_pixels_y.getInt());

    mirror[X] = m_cfg.display_mirror_x.getBool();
    mirror[Y] = m_cfg.display_mirror_y.getBool();
    
    auto ro = m_cfg.display_orientation.getInt();
    sla::RasterBase::Orientation orientation =
        ro == sla::RasterBase::roPortrait ? sla::RasterBase::roPortrait :
                                            sla::RasterBase::roLandscape;
    
    if (orientation == sla::RasterBase::roPortrait) {
        std::swap(w, h);
        std::swap(pw, ph);
    }

    res   = sla::RasterBase::Resolution{pw, ph};
    pxdim = sla::RasterBase::PixelDim{w / pw, h / ph};
    sla::RasterBase::Trafo tr{orientation, mirror};

    double gamma = m_cfg.gamma_correction.getFloat();

    return sla::create_raster_grayscale_aa(res, pxdim, gamma, tr);
}

sla::RasterEncoder SL1Archive::get_encoder() const
{
    return sla::PNGRasterEncoder{};
}

void SL1Archive::export_print(Zipper& zipper,
                              const SLAPrint &print,
                              const std::string &prjname)
{
    std::string project =
        prjname.empty() ?
            boost::filesystem::path(zipper.get_filename()).stem().string() :
            prjname;
    
    ConfMap iniconf, slicerconf;
    fill_iniconf(iniconf, print);
    
    iniconf["jobDir"] = project;

    fill_slicerconf(slicerconf, print);

    try {
        zipper.add_entry("config.ini");
        zipper << to_ini(iniconf);
        zipper.add_entry("prusaslicer.ini");
        zipper << to_ini(slicerconf);
        
        size_t i = 0;
        for (const sla::EncodedRaster &rst : m_layers) {

            std::string imgname = project + string_printf("%.5d", i++) + "." +
                                  rst.extension();
            
            zipper.add_entry(imgname.c_str(), rst.data(), rst.size());
        }
    } catch(std::exception& e) {
        BOOST_LOG_TRIVIAL(error) << e.what();
        // Rethrow the exception
        throw;
    }
}

} // namespace Slic3r
