#include "stdafx.h"
#include "Emu/VFS.h"
#include "TROPUSR.h"

LOG_CHANNEL(trp_log, "Trophy");

enum : u32
{
	TROPUSR_MAGIC = 0x818F54AD
};

std::shared_ptr<rXmlNode> trophy_xml_document::GetRoot()
{
	auto trophy_base = rXmlDocument::GetRoot();
	if (!trophy_base)
	{
		return nullptr;
	}

	if (auto trophy_conf = trophy_base->GetChildren();
		trophy_conf && trophy_conf->GetName() == "trophyconf")
	{
		trophy_base = trophy_conf;
	}
	else
	{
		trp_log.error("trophy_xml_document: Root name does not match trophyconf in trophy. Name: %s", trophy_conf ? trophy_conf->GetName() : trophy_base->GetName());
		// TODO: return nullptr or is this possible?
	}

	return trophy_base;
}

TROPUSRLoader::load_result TROPUSRLoader::Load(std::string_view filepath, std::string_view configpath)
{
	const std::string path = vfs::get(filepath);

	load_result res{};

	// Generate TROPUSR.DAT
	auto generate = [&]
	{
		// Reset filesystem error
		fs::g_tls_error = fs::error::ok;

		// Generate TROPUSR.DAT if not existing
		res.success = Generate(filepath, configpath);

		if (!res.success)
		{
			trp_log.error("TROPUSRLoader::Load(): Failed to generate TROPUSR.DAT (path='%s', cfg='%s', %s)", path, configpath, fs::g_tls_error);
		}

		m_file.close();
		return res;
	};

	if (!m_file.open(path))
	{
		return generate();
	}

	if (!LoadHeader() || !LoadTableHeaders() || !LoadTables())
	{
		// Ignore existing TROPUSR.DAT because it is invalid
		m_file.close();
		res.discarded_existing = true;
		trp_log.error("TROPUSRLoader::Load(): Failed to load existing TROPUSR.DAT, trying to generate new file with empty trophies history! (path='%s')", path);
		return generate();
	}

	m_file.close();
	res.success = true;
	return res;
}

bool TROPUSRLoader::LoadHeader()
{
	if (!m_file)
	{
		return false;
	}

	m_file.seek(0);

	if (!m_file.read(m_header) || m_header.magic != TROPUSR_MAGIC)
	{
		return false;
	}

	return true;
}

bool TROPUSRLoader::LoadTableHeaders()
{
	if (!m_file)
	{
		return false;
	}

	m_file.seek(0x30);
	m_tableHeaders.clear();

	if (!m_file.read(m_tableHeaders, m_header.tables_count))
	{
		return false;
	}

	return true;
}

bool TROPUSRLoader::LoadTables()
{
	if (!m_file)
	{
		return false;
	}

	for (const TROPUSRTableHeader& tableHeader : m_tableHeaders)
	{
		m_file.seek(tableHeader.offset);

		if (tableHeader.type == 4u)
		{
			m_table4.clear();

			if (!m_file.read(m_table4, tableHeader.entries_count))
				return false;
		}

		if (tableHeader.type == 6u)
		{
			m_table6.clear();

			if (!m_file.read(m_table6, tableHeader.entries_count))
				return false;
		}

		// TODO: Other tables
	}

	return true;
}

// TODO: TROPUSRLoader::Save deletes the TROPUSR and creates it again. This is probably very slow.
bool TROPUSRLoader::Save(std::string_view filepath)
{
	fs::pending_file temp(vfs::get(filepath));

	if (!temp.file)
	{
		return false;
	}

	temp.file.write(m_header);
	temp.file.write(m_tableHeaders);
	temp.file.write(m_table4);
	temp.file.write(m_table6);

	return temp.commit();
}

bool TROPUSRLoader::Generate(std::string_view filepath, std::string_view configpath)
{
	fs::file config(vfs::get(configpath));

	if (!config)
	{
		return false;
	}

	trophy_xml_document doc{};
	pugi::xml_parse_result res = doc.Read(config.to_string());
	if (!res)
	{
		trp_log.error("TROPUSRLoader::Generate: Failed to read file: %s", filepath);
		return false;
	}

	m_table4.clear();
	m_table6.clear();

	auto trophy_base = doc.GetRoot();
	if (!trophy_base)
	{
		trp_log.error("TROPUSRLoader::Generate: Failed to read file (root is null): %s", filepath);
		return false;
	}

	for (std::shared_ptr<rXmlNode> n = trophy_base->GetChildren(); n; n = n->GetNext())
	{
		if (n->GetName() == "trophy")
		{
			const u32 trophy_id = std::atoi(n->GetAttribute("id").c_str());
			const u32 trophy_pid = std::atoi(n->GetAttribute("pid").c_str());

			u32 trophy_grade;
			switch (n->GetAttribute("ttype")[0])
			{
			case 'B': trophy_grade = trophy_grade::bronze; break;
			case 'S': trophy_grade = trophy_grade::silver; break;
			case 'G': trophy_grade = trophy_grade::gold; break;
			case 'P': trophy_grade = trophy_grade::platinum; break;
			default: trophy_grade = trophy_grade::unknown; break;
			}

			TROPUSREntry4 entry4 = {4, u32{sizeof(TROPUSREntry4)} - 0x10, ::size32(m_table4), 0, trophy_id, trophy_grade, trophy_pid};
			TROPUSREntry6 entry6 = {6, u32{sizeof(TROPUSREntry6)} - 0x10, ::size32(m_table6), 0, trophy_id};

			m_table4.push_back(entry4);
			m_table6.push_back(entry6);
		}
	}

	u64 offset = sizeof(TROPUSRHeader) + 2 * sizeof(TROPUSRTableHeader);
	TROPUSRTableHeader table4header = {4, u32{sizeof(TROPUSREntry4)} - 0x10, 1, ::size32(m_table4), offset};
	offset += m_table4.size() * sizeof(TROPUSREntry4);
	TROPUSRTableHeader table6header = {6, u32{sizeof(TROPUSREntry6)} - 0x10, 1, ::size32(m_table6), offset};
	offset += m_table6.size() * sizeof(TROPUSREntry6);

	m_tableHeaders.clear();
	m_tableHeaders.push_back(table4header);
	m_tableHeaders.push_back(table6header);

	std::memset(&m_header, 0, sizeof(m_header));
	m_header.magic = TROPUSR_MAGIC;
	m_header.unk1 = 0x00010000;
	m_header.tables_count = ::size32(m_tableHeaders);
	m_header.unk2 = 0;

	return Save(filepath);
}

u32 TROPUSRLoader::GetTrophiesCount() const
{
	return ::size32(m_table6);
}

u32 TROPUSRLoader::GetUnlockedTrophiesCount() const
{
	u32 count = 0;
	for (const auto& trophy : m_table6)
	{
		if (trophy.trophy_state)
		{
			count++;
		}
	}
	return count;
}

u32 TROPUSRLoader::GetUnlockedPlatinumID(u32 trophy_id, const std::string& config_path)
{
	constexpr u32 invalid_trophy_id = -1; // SCE_NP_TROPHY_INVALID_TROPHY_ID;

	if (trophy_id >= m_table6.size() || trophy_id >= m_table4.size())
	{
		trp_log.warning("TROPUSRLoader::GetUnlockedPlatinumID: Invalid id=%d", trophy_id);
		return invalid_trophy_id;
	}

	if (m_table6.size() != m_table4.size())
	{
		trp_log.warning("TROPUSRLoader::GetUnlockedPlatinumID: Table size mismatch: %d vs. %d", m_table6.size(), m_table4.size());
		return invalid_trophy_id;
	}

	// We need to read the trophy info from file here and update it for backwards compatibility.
	// TROPUSRLoader::Generate will currently not be called on existing trophy data which might lack the pid.
	fs::file config(config_path);

	if (!config)
	{
		return invalid_trophy_id;
	}

	trophy_xml_document doc{};
	pugi::xml_parse_result res = doc.Read(config.to_string());
	if (!res)
	{
		trp_log.error("TROPUSRLoader::GetUnlockedPlatinumID: Failed to read file: %s", config_path);
		return invalid_trophy_id;
	}

	auto trophy_base = doc.GetRoot();
	if (!trophy_base)
	{
		trp_log.error("TROPUSRLoader::GetUnlockedPlatinumID: Failed to read file (root is null): %s", config_path);
		return false;
	}

	const usz trophy_count = m_table4.size();

	for (std::shared_ptr<rXmlNode> n = trophy_base->GetChildren(); n; n = n->GetNext())
	{
		if (n->GetName() == "trophy")
		{
			const u32 trophy_id = std::atoi(n->GetAttribute("id").c_str());
			const u32 trophy_pid = std::atoi(n->GetAttribute("pid").c_str());

			// We currently assume that trophies are ordered
			if (trophy_id < trophy_count && m_table4[trophy_id].trophy_id == trophy_id)
			{
				// Update the pid for backwards compatibility
				m_table4[trophy_id].trophy_pid = trophy_pid;
			}
		}
	}

	// Get this trophy's platinum link id
	const u32 pid = m_table4[trophy_id].trophy_pid;

	// The platinum trophy has to have a valid id and must still be locked
	if (pid == invalid_trophy_id || GetTrophyUnlockState(pid)) // the first check is redundant but I'll keep it to prevent regressions
	{
		return invalid_trophy_id;
	}

	// The platinum trophy stays locked if any relevant trophy is still locked
	for (usz i = 0; i < trophy_count; i++)
	{
		if (m_table4[i].trophy_pid == pid && !m_table6[i].trophy_state)
		{
			return invalid_trophy_id;
		}
	}

	// All relevant trophies for this platinum link id were unlocked
	return pid;
}

u32 TROPUSRLoader::GetTrophyGrade(u32 id) const
{
	if (id >= m_table4.size())
	{
		trp_log.warning("TROPUSRLoader::GetTrophyGrade: Invalid id=%d", id);
		return trophy_grade::unknown;
	}

	return m_table4[id].trophy_grade; // Let's assume the trophies are stored ordered
}

u32 TROPUSRLoader::GetTrophyUnlockState(u32 id) const
{
	if (id >= m_table6.size())
	{
		trp_log.warning("TROPUSRLoader::GetTrophyUnlockState: Invalid id=%d", id);
		return 0;
	}

	return m_table6[id].trophy_state; // Let's assume the trophies are stored ordered
}

u64 TROPUSRLoader::GetTrophyTimestamp(u32 id) const
{
	if (id >= m_table6.size())
	{
		trp_log.warning("TROPUSRLoader::GetTrophyTimestamp: Invalid id=%d", id);
		return 0;
	}

	// TODO: What timestamp does sceNpTrophyGetTrophyInfo want, timestamp1 or timestamp2?
	return m_table6[id].timestamp2; // Let's assume the trophies are stored ordered
}

bool TROPUSRLoader::UnlockTrophy(u32 id, u64 timestamp1, u64 timestamp2)
{
	if (id >= m_table6.size())
	{
		trp_log.warning("TROPUSRLoader::UnlockTrophy: Invalid id=%d", id);
		return false;
	}

	m_table6[id].trophy_state = 1;
	m_table6[id].timestamp1 = timestamp1;
	m_table6[id].timestamp2 = timestamp2;

	return true;
}

bool TROPUSRLoader::LockTrophy(u32 id)
{
	if (id >= m_table6.size())
	{
		trp_log.warning("TROPUSRLoader::LockTrophy: Invalid id=%d", id);
		return false;
	}

	m_table6[id].trophy_state = 0;
	m_table6[id].timestamp1 = 0;
	m_table6[id].timestamp2 = 0;

	return true;
}