#include "controllers/ReportController.h"

#include "common/Auth.h"
#include "common/Http.h"
#include "services/ReportService.h"

#include <drogon/MultiPart.h>

#include <filesystem>
#include <optional>

using drogon::HttpResponsePtr;

namespace
{
std::optional<std::string> queryValue(const drogon::HttpRequestPtr &req,
                                      const std::string &key)
{
    const auto value = req->getParameter(key);
    if (value.empty())
    {
        return std::nullopt;
    }
    return value;
}

std::optional<visione::auth::UserContext> requireUser(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &callback)
{
    const auto user = visione::auth::authenticate(req);
    if (!user)
    {
        callback(visione::http::error("unauthorized", drogon::k401Unauthorized));
    }
    return user;
}

bool blockPasswordChangeRequired(
    const visione::auth::UserContext &user,
    std::function<void(const HttpResponsePtr &)> &callback)
{
    if (!visione::auth::mustChangePassword(user))
    {
        return false;
    }
    callback(visione::http::error("password_change_required",
                                  drogon::k403Forbidden));
    return true;
}

void sendService(Json::Value body,
                 std::function<void(const HttpResponsePtr &)> &&callback)
{
    if (body.get("ok", false).asBool())
    {
        callback(visione::http::json(std::move(body)));
        return;
    }
    const auto error = body.get("error", "").asString();
    const auto status = error == "forbidden" ? drogon::k403Forbidden
                                             : drogon::k400BadRequest;
    callback(visione::http::json(std::move(body), status));
}

bool isAllowedImage(const drogon::HttpFile &file)
{
    const auto type = file.getContentType();
    return type == drogon::CT_IMAGE_JPG || type == drogon::CT_IMAGE_PNG ||
           type == drogon::CT_IMAGE_WEBP;
}

std::string imageContentType(const drogon::HttpFile &file)
{
    switch (file.getContentType())
    {
        case drogon::CT_IMAGE_JPG:
            return "image/jpeg";
        case drogon::CT_IMAGE_PNG:
            return "image/png";
        case drogon::CT_IMAGE_WEBP:
            return "image/webp";
        default:
            return "application/octet-stream";
    }
}
}  // namespace

void ReportController::create(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    const auto body = visione::http::requireJson(req);
    if (body.isNull())
    {
        callback(visione::http::error("invalid_json", drogon::k400BadRequest));
        return;
    }

    visione::services::ReportService service;
    sendService(service.createReport(*user, body), std::move(callback));
}

void ReportController::list(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }

    visione::services::ReportService service;
    sendService(service.listReports(*user,
                                    queryValue(req, "status"),
                                    queryValue(req, "category_id"),
                                    queryValue(req, "area_id")),
                std::move(callback));
}

void ReportController::detail(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    visione::services::ReportService service;
    sendService(service.reportDetail(*user, reportId), std::move(callback));
}

void ReportController::updateStatus(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    const auto body = visione::http::requireJson(req);
    visione::services::ReportService service;
    sendService(service.updateStatus(*user, reportId, body), std::move(callback));
}

void ReportController::takeReport(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    visione::services::ReportService service;
    sendService(service.takeReport(*user, reportId), std::move(callback));
}

void ReportController::addMessage(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    const auto body = visione::http::requireJson(req);
    visione::services::ReportService service;
    sendService(service.addMessage(*user, reportId, body), std::move(callback));
}

void ReportController::listMessages(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    visione::services::ReportService service;
    sendService(service.listMessages(*user, reportId), std::move(callback));
}

void ReportController::assignTeam(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    const auto body = visione::http::requireJson(req);
    visione::services::ReportService service;
    sendService(service.assignTeam(*user, reportId, body), std::move(callback));
}

void ReportController::addFeedback(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }
    const auto body = visione::http::requireJson(req);
    visione::services::ReportService service;
    sendService(service.addFeedback(*user, reportId, body), std::move(callback));
}

void ReportController::uploadPhotos(
    const drogon::HttpRequestPtr &req,
    std::function<void(const HttpResponsePtr &)> &&callback,
    long long reportId)
{
    auto user = requireUser(req, callback);
    if (!user || blockPasswordChangeRequired(*user, callback))
    {
        return;
    }

    drogon::MultiPartParser parser;
    if (parser.parse(req) != 0 || parser.getFiles().empty())
    {
        callback(visione::http::error("invalid_multipart", drogon::k400BadRequest));
        return;
    }

    const auto &uploadConfig = drogon::app().getCustomConfig()["uploads"];
    const auto reportsPath =
        uploadConfig.get("reports_path", "uploads/reports").asString();
    const auto publicBasePath =
        uploadConfig.get("public_base_path", "/uploads").asString();

    const auto reportDir =
        std::filesystem::path(reportsPath) / std::to_string(reportId);

    visione::services::ReportService service;
    auto allowed = service.canAddPhoto(*user, reportId);
    if (!allowed.get("ok", false).asBool())
    {
        callback(visione::http::json(std::move(allowed), drogon::k403Forbidden));
        return;
    }

    if (parser.getFiles().size() >
        static_cast<size_t>(allowed.get("remaining_photo_slots", 0).asInt()))
    {
        callback(visione::http::error("too_many_photos", drogon::k400BadRequest));
        return;
    }
    for (const auto &file : parser.getFiles())
    {
        if (!isAllowedImage(file))
        {
            callback(visione::http::error("unsupported_photo_type",
                                          drogon::k400BadRequest));
            return;
        }
    }

    std::filesystem::create_directories(reportDir);

    Json::Value response;
    response["ok"] = true;
    response["photos"] = Json::arrayValue;

    for (const auto &file : parser.getFiles())
    {
        auto extension = std::string(file.getFileExtension());
        if (!extension.empty() && extension.front() != '.')
        {
            extension = "." + extension;
        }
        const auto fileName = drogon::utils::getUuid() + extension;
        const auto fullPath = reportDir / fileName;
        if (file.saveAs(fullPath.string()) != 0)
        {
            callback(visione::http::error("photo_save_failed",
                                          drogon::k500InternalServerError));
            return;
        }

        const auto url = publicBasePath + "/reports/" + std::to_string(reportId) +
                         "/" + fileName;
        auto saved = service.addPhoto(*user,
                                      reportId,
                                      url,
                                      file.getFileName(),
                                      imageContentType(file),
                                      file.fileLength());
        if (!saved.get("ok", false).asBool())
        {
            callback(visione::http::json(std::move(saved), drogon::k403Forbidden));
            return;
        }
        response["photos"].append(url);
    }

    callback(visione::http::json(std::move(response), drogon::k201Created));
}