// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.

#include <ircd/util/params.h>

using namespace ircd;

mapi::header IRCD_MODULE
{
	"IRCd terminal console: runtime-reloadable library supporting the console."
};

IRCD_EXCEPTION_HIDENAME(ircd::error, bad_command)

// Buffer all output into this rather than writing to std::cout. This allows
// the console to be reused easily inside the application (like a matrix room).
std::stringstream out;

static bool console_cmd__state(const string_view &line);
static bool console_cmd__event(const string_view &line);
static bool console_cmd__key(const string_view &line);
static bool console_cmd__net(const string_view &line);
static bool console_cmd__mod(const string_view &line);

extern "C" int
console_command(const string_view &line, std::string &output)
try
{
	const unwind writeback{[&output]
	{
		output = out.str();
		out.str(std::string{});
	}};

	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	switch(hash(token(line, " ", 0)))
	{
		case hash("mod"):
			return console_cmd__mod(args);

		case hash("net"):
			return console_cmd__net(args);

		case hash("key"):
			return console_cmd__key(args);

		case hash("event"):
			return console_cmd__event(args);

		case hash("state"):
			return console_cmd__state(args);
	}

	return -1;
}
catch(const bad_command &e)
{
	return -2;
}

//
// mod
//

static bool console_cmd__mod_path(const string_view &line);
static bool console_cmd__mod_list(const string_view &line);
static bool console_cmd__mod_syms(const string_view &line);

bool
console_cmd__mod(const string_view &line)
{
	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	switch(hash(token(line, " ", 0)))
	{
		case hash("path"):
			return console_cmd__mod_path(args);

		case hash("list"):
			return console_cmd__mod_list(args);

		case hash("syms"):
			return console_cmd__mod_syms(args);

		default:
			throw bad_command{};
	}
}

bool
console_cmd__mod_path(const string_view &line)
{
	for(const auto &path : ircd::mods::paths)
		out << path << std::endl;

	return true;
}

bool
console_cmd__mod_list(const string_view &line)
{
	for(const auto &mod : mods::available())
	{
		const auto loadstr
		{
			mods::loaded(mod)? "\033[1;42m \033[0m" : " "
		};

		out << "[" << loadstr << "] " << mod << std::endl;
	}

	return true;
}

bool
console_cmd__mod_syms(const string_view &line)
{
	const std::string path
	{
		token(line, ' ', 0)
	};

	const std::vector<std::string> symbols
	{
		mods::symbols(path)
	};

	for(const auto &sym : symbols)
		out << sym << std::endl;

	out << " -- " << symbols.size() << " symbols in " << path << std::endl;
	return true;
}

//
// net
//

static bool console_cmd__net_host(const string_view &line);

bool
console_cmd__net(const string_view &line)
{
	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	switch(hash(token(line, " ", 0)))
	{
		case hash("host"):
			return console_cmd__net_host(args);

		default:
			throw bad_command{};
	}
}

static bool console_cmd__net_host__default(const string_view &line);

bool
console_cmd__net_host(const string_view &line)
{
	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	switch(hash(token(line, " ", 0)))
	{
		default:
			return console_cmd__net_host__default(line);
	}

	return true;
}

bool
console_cmd__net_host__default(const string_view &line)
{
	const params token
	{
		line, " ", {"host", "service"}
	};

	const auto &host{token.at(0)};
	const auto &service
	{
		token.count() > 1? token.at(1) : string_view{}
	};

	const net::hostport hostport
	{
		host, service
	};

	ctx::dock dock;
	bool done{false};
	net::ipport ipport;
	std::exception_ptr eptr;
	net::dns(hostport, [&done, &dock, &eptr, &ipport]
	(std::exception_ptr eptr_, const net::ipport &ipport_)
	{
		eptr = std::move(eptr_);
		ipport = ipport_;
		done = true;
		dock.notify_one();
	});

	while(!done)
		dock.wait();

	if(eptr)
		std::rethrow_exception(eptr);
	else
		std::cout << ipport << std::endl;

	return true;
}

//
// key
//

static bool console_cmd__key__default(const string_view &line);
static bool console_cmd__key__fetch(const string_view &line);
static bool console_cmd__key__get(const string_view &line);

bool
console_cmd__key(const string_view &line)
{
	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	if(!empty(args)) switch(hash(token(line, " ", 0)))
	{
		case hash("get"):
			return console_cmd__key__get(args);

		case hash("fetch"):
			return console_cmd__key__fetch(args);
	}

	return console_cmd__key__default(args);
}

bool
console_cmd__key__get(const string_view &line)
{
	const auto server_name
	{
		token(line, ' ', 0)
	};

	m::keys::get(server_name, [](const auto &keys)
	{
		out << keys << std::endl;
	});

	return true;
}

bool
console_cmd__key__fetch(const string_view &line)
{

	return true;
}

bool
console_cmd__key__default(const string_view &line)
{
	out << "origin:                  " << m::my_host() << std::endl;
	out << "public key ID:           " << m::self::public_key_id << std::endl;
	out << "public key base64:       " << m::self::public_key_b64 << std::endl;
	out << "TLS cert sha256 base64:  " << m::self::tls_cert_der_sha256_b64 << std::endl;

	return true;
}

//
// event
//

static bool console_cmd__event__default(const string_view &line);
static bool console_cmd__event__fetch(const string_view &line);

bool
console_cmd__event(const string_view &line)
{
	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	switch(hash(token(line, " ", 0)))
	{
		case hash("fetch"):
			return console_cmd__event__fetch(args);

		default:
			return console_cmd__event__default(line);
	}
}

bool
console_cmd__event__fetch(const string_view &line)
{
	const m::event::id event_id
	{
		token(line, ' ', 0)
	};

	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	const auto host
	{
		!empty(args)? token(args, ' ', 0) : ""_sv
	};

	m::v1::event::opts opts;
	if(host)
		opts.remote = host;

	static char buf[96_KiB];
	m::v1::event request
	{
		event_id, buf, opts
	};

	//TODO: TO

	const auto code
	{
		request.get()
	};

	const m::event event
	{
		request
	};

	out << json::object{request} << std::endl;
	out << std::endl;
	out << pretty(event) << std::endl;
	return true;
}

bool
console_cmd__event__default(const string_view &line)
{
	const m::event::id event_id
	{
		token(line, ' ', 0)
	};

	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	static char buf[64_KiB];
	const m::event event
	{
		event_id, buf
	};

	if(!empty(args)) switch(hash(token(args, ' ', 0)))
	{
		case hash("raw"):
			out << json::object{buf} << std::endl;
			return true;
	}

	out << pretty(event) << std::endl;
	return true;
}

//
// state
//

static bool console_cmd__state_head(const string_view &line);
static bool console_cmd__state_count(const string_view &line);
static bool console_cmd__state_get(const string_view &line);
static bool console_cmd__state_each(const string_view &line);
static bool console_cmd__state_dfs(const string_view &line);

bool
console_cmd__state(const string_view &line)
{
	const auto args
	{
		tokens_after(line, ' ', 0)
	};

	switch(hash(token(line, " ", 0)))
	{
		case hash("head"):
			return console_cmd__state_head(args);

		case hash("get"):
			return console_cmd__state_get(args);

		case hash("count"):
			return console_cmd__state_count(args);

		case hash("each"):
			return console_cmd__state_each(args);

		case hash("dfs"):
			return console_cmd__state_dfs(args);

		default:
			throw bad_command{};
	}
}

bool
console_cmd__state_head(const string_view &line)
{
	const m::room::id room_id
	{
		token(line, ' ', 0)
	};

	char buf[m::state::ID_MAX_SZ];
	out << m::state::get_head(buf, room_id) << std::endl;
	return true;
}

bool
console_cmd__state_count(const string_view &line)
{
	const string_view arg
	{
		token(line, ' ', 0)
	};

	char buf[m::state::ID_MAX_SZ];
	const string_view head
	{
		startswith(arg, '!')? m::state::get_head(buf, arg) : arg
	};

	out << m::state::count(head) << std::endl;
	return true;
}

bool
console_cmd__state_each(const string_view &line)
{
	const string_view arg
	{
		token(line, ' ', 0)
	};

	const string_view type
	{
		token(line, ' ', 1)
	};

	char buf[m::state::ID_MAX_SZ];
	const string_view head
	{
		startswith(arg, '!')? m::state::get_head(buf, arg) : arg
	};

	m::state::each(head, type, []
	(const string_view &key, const string_view &val)
	{
		out << key << " => " << val << std::endl;
		return true;
	});

	return true;
}

bool
console_cmd__state_get(const string_view &line)
{
	const m::room::id room_id
	{
		token(line, ' ', 0)
	};

	const string_view type
	{
		token(line, ' ', 1)
	};

	const string_view state_key
	{
		token(line, ' ', 2)
	};

	m::state::get__room(room_id, type, state_key, []
	(const auto &value)
	{
		out << "got: " << value << std::endl;
	});

	return true;
}

bool
console_cmd__state_dfs(const string_view &line)
{
	const string_view arg
	{
		token(line, ' ', 0)
	};

	char buf[m::state::ID_MAX_SZ];
	const string_view head
	{
		startswith(arg, '!')? m::state::get_head(buf, arg) : arg
	};

	m::state::dfs(head, []
	(const auto &key, const string_view &val, const uint &depth, const uint &pos)
	{
		out << std::setw(2) << depth << " + " << pos
		    << " : " << key << " => " << val
		    << std::endl;

		return true;
	});

	return true;
}