/*
 * Copyright 2018 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "bt.hpp"
#include "io.hpp"
#include "lpc.hpp"
#include "p2a.hpp"
#include "pci.hpp"
#include "tool_errors.hpp"
#include "updater.hpp"

/* Use CLI11 argument parser once in openbmc/meta-oe or whatever. */
#include <getopt.h>

#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <exception>
#include <iostream>
#include <ipmiblob/blob_handler.hpp>
#include <ipmiblob/ipmi_handler.hpp>
#include <iterator>
#include <limits>
#include <memory>
#include <string>
#include <vector>

#define IPMILPC "ipmilpc"
#define IPMIPCI "ipmipci"
#define IPMIBT "ipmibt"
#define STATIC "static"
#define UBITAR "ubitar"

namespace
{
const std::vector<std::string> interfaceList = {IPMIBT, IPMILPC, IPMIPCI};
const std::vector<std::string> typeList = {STATIC, UBITAR};
} // namespace

void usage(const char* program)
{
    std::fprintf(
        stderr,
        "Usage: %s --command <command> --interface <interface> --image "
        "<image file> --sig <signature file> --type <layout>\n",
        program);

    std::fprintf(stderr, "interfaces: ");
    std::copy(interfaceList.begin(), interfaceList.end(),
              std::ostream_iterator<std::string>(std::cerr, ", "));
    std::fprintf(stderr, "\n");

    std::fprintf(stderr, "layouts: ");
    std::copy(typeList.begin(), typeList.end(),
              std::ostream_iterator<std::string>(std::cerr, ", "));
    std::fprintf(stderr, "\n");
}

bool checkType(const std::string& type)
{
    auto tFound = std::find(typeList.begin(), typeList.end(), type);
    return (tFound != typeList.end());
}

bool checkCommand(const std::string& command)
{
    return (command == "update");
}

bool checkInterface(const std::string& interface)
{
    auto intf =
        std::find(interfaceList.begin(), interfaceList.end(), interface);
    return (intf != interfaceList.end());
}

int main(int argc, char* argv[])
{
    std::string command, interface, imagePath, signaturePath, type;
    char* valueEnd = nullptr;
    long address = 0;
    long length = 0;
    std::uint32_t hostAddress = 0;
    std::uint32_t hostLength = 0;

    while (1)
    {
        // clang-format off
        static struct option long_options[] = {
            {"command", required_argument, 0, 'c'},
            {"interface", required_argument, 0, 'i'},
            {"image", required_argument, 0, 'm'},
            {"sig", required_argument, 0, 's'},
            {"address", required_argument, 0, 'a'},
            {"length", required_argument, 0, 'l'},
            {"type", required_argument, 0, 't'},
            {0, 0, 0, 0}
        };
        // clang-format on

        int option_index = 0;
        int c = getopt_long(argc, argv, "c:i:m:s:a:l:t:", long_options,
                            &option_index);
        if (c == -1)
        {
            break;
        }

        switch (c)
        {
            case 'c':
                command = std::string{optarg};
                if (!checkCommand(command))
                {
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }

                break;
            case 'i':
                interface = std::string{optarg};
                if (!checkInterface(interface))
                {
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                break;
            case 'm':
                imagePath = std::string{optarg};
                break;
            case 's':
                signaturePath = std::string{optarg};
                break;
            case 'a':
                address = std::strtol(&optarg[0], &valueEnd, 0);
                if (valueEnd == nullptr)
                {
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                if (address > std::numeric_limits<std::uint32_t>::max())
                {
                    std::fprintf(stderr, "Address beyond 32-bit limit.\n");
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                hostAddress = static_cast<std::uint32_t>(address);
                break;
            case 'l':
                length = std::strtol(&optarg[0], &valueEnd, 0);
                if (valueEnd == nullptr)
                {
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                if (length > std::numeric_limits<std::uint32_t>::max())
                {
                    std::fprintf(stderr, "Length beyond 32-bit limit.\n");
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                hostLength = static_cast<std::uint32_t>(length);
                break;
            case 't':
                type = std::string{optarg};
                if (!checkType(type))
                {
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                break;
            default:
                usage(argv[0]);
                exit(EXIT_FAILURE);
        }
    }

    if (command.empty())
    {
        usage(argv[0]);
        exit(EXIT_FAILURE);
    }

    /* They want to update the firmware. */
    if (command == "update")
    {
        if (interface.empty() || imagePath.empty() || signaturePath.empty())
        {
            usage(argv[0]);
            exit(EXIT_FAILURE);
        }

        auto ipmi = ipmiblob::IpmiHandler::CreateIpmiHandler();
        ipmiblob::BlobHandler blob(std::move(ipmi));
        host_tool::DevMemDevice devmem;
        host_tool::PciUtilImpl pci;

        std::unique_ptr<host_tool::DataInterface> handler;

        /* Input has already been validated in this case. */
        if (interface == IPMIBT)
        {
            handler = std::make_unique<host_tool::BtDataHandler>(&blob);
        }
        else if (interface == IPMILPC)
        {
            if (hostAddress == 0 || hostLength == 0)
            {
                std::fprintf(stderr, "Address or Length were 0\n");
                exit(EXIT_FAILURE);
            }
            handler = std::make_unique<host_tool::LpcDataHandler>(
                &blob, &devmem, hostAddress, hostLength);
        }
        else if (interface == IPMIPCI)
        {
            handler = std::make_unique<host_tool::P2aDataHandler>(
                &blob, &devmem, &pci);
        }

        if (!handler)
        {
            /* TODO(venture): use a custom exception. */
            std::fprintf(stderr, "Interface %s is unavailable\n",
                         interface.c_str());
            exit(EXIT_FAILURE);
        }

        /* The parameters are all filled out. */
        try
        {
            host_tool::UpdateHandler updater(&blob, handler.get());
            host_tool::updaterMain(&updater, imagePath, signaturePath, type);
        }
        catch (const host_tool::ToolException& e)
        {
            std::fprintf(stderr, "Exception received: %s\n", e.what());
            return -1;
        }
        catch (const std::exception& e)
        {
            std::fprintf(stderr, "Unexpected exception received: %s\n",
                         e.what());
            return -1;
        }
    }

    return 0;
}