#include <regex>

#include "blankie/murl.h"

#include "pixivmodels.h"
#include "numberhelper.h"

static inline std::optional<std::string> get_1920x960_cover_image(blankie::murl::Url url);
static inline std::optional<std::string> get_original_cover_image(blankie::murl::Url url);
static inline std::optional<std::string> get_original_profile_picture(blankie::murl::Url url);

const std::string& Images::original_or_thumbnail() const {
    if (this->original) {
        return *this->original;
    }
    if (!this->thumbnails.empty()) {
        return this->thumbnails.back();
    }
    throw std::runtime_error("Images does not contain any images");
}

const std::string& Images::thumbnail_or_original() const {
    if (!this->thumbnails.empty()) {
        return this->thumbnails.back();
    }
    if (this->original) {
        return *this->original;
    }
    throw std::runtime_error("Images does not contain any images");
}

void from_json(const nlohmann::json& j, User& user) {
    j.at("user_account").get_to(user.username);
    j.at("user_name").get_to(user.display_name);
    user.user_id = to_ull(j.at("user_id").get_ref<const nlohmann::json::string_t&>());

    if (j.contains("cover_image") && j["cover_image"].is_object()) {
        nlohmann::json cover_image = j["cover_image"];
        std::string c_720x360 = cover_image.at("profile_cover_image").at("720x360").get<std::string>();
        std::optional<std::string> original = get_original_cover_image(c_720x360);
        std::optional<std::string> c_1920x960 = get_1920x960_cover_image(c_720x360);

        user.cover_images = {std::move(original), {std::move(c_720x360)}};
        if (c_1920x960) {
            user.cover_images->thumbnails.push_back(std::move(*c_1920x960));
        }
    }

    nlohmann::json profile_img = j.at("profile_img");
    if (profile_img.contains("main_s")) {
        user.profile_pictures.thumbnails.push_back(profile_img["main_s"].get<std::string>());
    }
    user.profile_pictures.thumbnails.push_back(profile_img.at("main").get<std::string>());
    user.profile_pictures.original = get_original_profile_picture(user.profile_pictures.thumbnails.back());

    if (j.contains("user_webpage")) {
        std::string user_webpage = j.at("user_webpage").get<std::string>();
        if (!user_webpage.empty()) {
            user.links.push_back({"Webpage", std::move(user_webpage)});
        }
    }
    auto add_social_as_needed = [&](const char* key, const char* public_name) {
        nlohmann::json social = j["social"];
        if (!social.contains(key)) {
            return;
        }

        std::string url = social[key].at("url").get<std::string>();
        user.links.push_back({public_name, std::move(url)});
    };
    if (j.contains("social") && j["social"].is_object()) {
        add_social_as_needed("twitter", "Twitter");
        add_social_as_needed("instagram", "Instagram");
        add_social_as_needed("tumblr", "Tumblr");
        add_social_as_needed("facebook", "Facebook");
        add_social_as_needed("circlems", "Circle.ms");
        add_social_as_needed("pawoo", "Pawoo");
    }
}

static std::regex resolution_path_regex("/c/(\\d+x\\d+)(.+)");
static inline std::optional<std::string> get_1920x960_cover_image(blankie::murl::Url url) {
    std::smatch sm;
    if (!std::regex_match(url.path, sm, resolution_path_regex)) {
        return std::nullopt;
    }
    if (sm[1] == "1920x960") {
        return std::nullopt;
    }
    url.path = "/c/1920x960" + sm.str(2);
    return url.to_string();
}

static std::regex thumbnail_path_regex("/c/[^/]+/(.+)_master\\d+(\\.\\w{3,4})?");
static inline std::optional<std::string> get_original_cover_image(blankie::murl::Url url) {
    std::smatch sm;
    if (!std::regex_match(url.path, sm, thumbnail_path_regex)) {
        return std::nullopt;
    }
    url.path = sm.str(1) + sm.str(2);
    return url.to_string();
}

static std::regex profile_picture_thumbnail_path_regex("(/.+)_\\d{2,}(\\.\\w{3,4})");
static inline std::optional<std::string> get_original_profile_picture(blankie::murl::Url url) {
    std::smatch sm;
    if (!std::regex_match(url.path, sm, profile_picture_thumbnail_path_regex)) {
        return std::nullopt;
    }
    url.path = sm.str(1) + sm.str(2);
    return url.to_string();
}