// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <cstring>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/file_sys/nca_metadata.h"
#include "core/file_sys/vfs.h"

namespace FileSys {

CNMT::CNMT(VirtualFile file) {
    if (file->ReadObject(&header) != sizeof(CNMTHeader))
        return;

    // If type is {Application, Update, AOC} has opt-header.
    if (header.type >= TitleType::Application && header.type <= TitleType::AOC) {
        if (file->ReadObject(&opt_header, sizeof(CNMTHeader)) != sizeof(OptionalHeader)) {
            LOG_WARNING(Loader, "Failed to read optional header.");
        }
    }

    for (u16 i = 0; i < header.number_content_entries; ++i) {
        auto& next = content_records.emplace_back(ContentRecord{});
        if (file->ReadObject(&next, sizeof(CNMTHeader) + i * sizeof(ContentRecord) +
                                        header.table_offset) != sizeof(ContentRecord)) {
            content_records.erase(content_records.end() - 1);
        }
    }

    for (u16 i = 0; i < header.number_meta_entries; ++i) {
        auto& next = meta_records.emplace_back(MetaRecord{});
        if (file->ReadObject(&next, sizeof(CNMTHeader) + i * sizeof(MetaRecord) +
                                        header.table_offset) != sizeof(MetaRecord)) {
            meta_records.erase(meta_records.end() - 1);
        }
    }
}

CNMT::CNMT(CNMTHeader header, OptionalHeader opt_header, std::vector<ContentRecord> content_records,
           std::vector<MetaRecord> meta_records)
    : header(std::move(header)), opt_header(std::move(opt_header)),
      content_records(std::move(content_records)), meta_records(std::move(meta_records)) {}

CNMT::~CNMT() = default;

u64 CNMT::GetTitleID() const {
    return header.title_id;
}

u32 CNMT::GetTitleVersion() const {
    return header.title_version;
}

TitleType CNMT::GetType() const {
    return header.type;
}

const std::vector<ContentRecord>& CNMT::GetContentRecords() const {
    return content_records;
}

const std::vector<MetaRecord>& CNMT::GetMetaRecords() const {
    return meta_records;
}

bool CNMT::UnionRecords(const CNMT& other) {
    bool change = false;
    for (const auto& rec : other.content_records) {
        const auto iter = std::find_if(content_records.begin(), content_records.end(),
                                       [&rec](const ContentRecord& r) {
                                           return r.nca_id == rec.nca_id && r.type == rec.type;
                                       });
        if (iter == content_records.end()) {
            content_records.emplace_back(rec);
            ++header.number_content_entries;
            change = true;
        }
    }
    for (const auto& rec : other.meta_records) {
        const auto iter =
            std::find_if(meta_records.begin(), meta_records.end(), [&rec](const MetaRecord& r) {
                return r.title_id == rec.title_id && r.title_version == rec.title_version &&
                       r.type == rec.type;
            });
        if (iter == meta_records.end()) {
            meta_records.emplace_back(rec);
            ++header.number_meta_entries;
            change = true;
        }
    }
    return change;
}

std::vector<u8> CNMT::Serialize() const {
    const bool has_opt_header =
        header.type >= TitleType::Application && header.type <= TitleType::AOC;
    const auto dead_zone = header.table_offset + sizeof(CNMTHeader);
    std::vector<u8> out(
        std::max(sizeof(CNMTHeader) + (has_opt_header ? sizeof(OptionalHeader) : 0), dead_zone) +
        content_records.size() * sizeof(ContentRecord) + meta_records.size() * sizeof(MetaRecord));
    memcpy(out.data(), &header, sizeof(CNMTHeader));

    // Optional Header
    if (has_opt_header) {
        memcpy(out.data() + sizeof(CNMTHeader), &opt_header, sizeof(OptionalHeader));
    }

    auto offset = header.table_offset;

    for (const auto& rec : content_records) {
        memcpy(out.data() + offset + sizeof(CNMTHeader), &rec, sizeof(ContentRecord));
        offset += sizeof(ContentRecord);
    }

    for (const auto& rec : meta_records) {
        memcpy(out.data() + offset + sizeof(CNMTHeader), &rec, sizeof(MetaRecord));
        offset += sizeof(MetaRecord);
    }

    return out;
}
} // namespace FileSys
