#include "../include/DownloadUtils.hpp"
#include "../include/Program.h"
#include "../include/Storage.hpp"
#include "../include/base64_url.hpp"
#include <SFML/System/Clock.hpp>

static const bool debug_download = false;

static int accumulate_string(char *data, int size, void *userdata) {
    std::string *str = (std::string*)userdata;
    str->append(data, size);
    return 0;
}

static const char *useragent_str = "user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36";

namespace QuickMedia {
    // TODO: Add timeout
    DownloadResult download_to_string(const std::string &url, std::string &result, const std::vector<CommandArg> &additional_args, bool use_tor, bool use_browser_useragent, bool fail_on_error) {
        sf::Clock timer;
        std::vector<const char*> args;
        if(use_tor)
            args.push_back("torsocks");
        args.insert(args.end(), { "curl", "-H", "Accept-Language: en-US,en;q=0.5", "-H", "Connection: keep-alive", "--compressed", "-s", "-L" });
        if(fail_on_error)
            args.push_back("-f");
        for(const CommandArg &arg : additional_args) {
            args.push_back(arg.option.c_str());
            args.push_back(arg.value.c_str());
        }
        if(use_browser_useragent) {
            args.push_back("-H");
            args.push_back(useragent_str);
        }
        args.push_back("--");
        args.push_back(url.c_str());
        args.push_back(nullptr);
        if(debug_download) {
            for(const char *arg : args) {
                if(arg)
                    fprintf(stderr, "'%s' ", arg);
            }
            fprintf(stderr, "\n");
        }
        if(exec_program(args.data(), accumulate_string, &result) != 0)
            return DownloadResult::NET_ERR;
        fprintf(stderr, "Download duration for %s: %d ms\n", url.c_str(), timer.getElapsedTime().asMilliseconds());
        return DownloadResult::OK;
    }

    DownloadResult download_to_string_cache(const std::string &url, std::string &result, const std::vector<CommandArg> &additional_args, bool use_tor, bool use_browser_useragent) {
        Path media_dir = get_cache_dir().join("media");
        Path media_file_path = Path(media_dir).join(base64_url::encode(url));
        if(get_file_type(media_file_path) == FileType::REGULAR) {
            if(file_get_content(media_file_path, result) == 0) {
                fprintf(stderr, "Loaded %s from cache\n", url.c_str());
                return DownloadResult::OK;
            } else {
                fprintf(stderr, "Failed to get content of cached media file: %s\n", media_file_path.data.c_str());
                return DownloadResult::ERR;
            }
        } else {
            DownloadResult download_result = download_to_string(url, result, additional_args, use_tor, use_browser_useragent);
            if(download_result == DownloadResult::OK) {
                Path media_file_path_tmp(media_file_path.data + ".tmp");
                if(create_directory_recursive(media_dir) == 0 && file_overwrite(media_file_path_tmp, result) == 0) {
                    if(rename(media_file_path_tmp.data.c_str(), media_file_path.data.c_str()) != 0) {
                        perror("rename");
                        download_result = DownloadResult::ERR;
                    }
                } else {
                    download_result = DownloadResult::ERR;
                }
            }
            return download_result;
        }
    }

    std::vector<CommandArg> create_command_args_from_form_data(const std::vector<FormData> &form_data) {
        // TODO: This boundary value might need to change, depending on the content. What if the form data contains the boundary value?
        const std::string boundary = "-----------------------------119561554312148213571335532670";
        std::string form_data_str;
        for(const FormData &form_data_item : form_data) {
            form_data_str += boundary;
            form_data_str += "\r\n";
            // TODO: What if the form key contains " or \r\n ?
            form_data_str += "Content-Disposition: form-data; name=\"" + form_data_item.key + "\"";
            form_data_str += "\r\n\r\n";
            // TODO: What is the value contains \r\n ?
            form_data_str += form_data_item.value;
            form_data_str += "\r\n";
        }
        // TODO: Verify if this should only be done also if the form data is empty
        form_data_str += boundary + "--";
        return {
            CommandArg{"-H", "Content-Type: multipart/form-data; boundary=" + boundary},
            CommandArg{"--data-binary", std::move(form_data_str)}
        };
    }
}