#include "services/AdminService.h"

#include "common/Validation.h"
#include "repositories/Sql.h"

#include <drogon/drogon.h>

namespace visione::services
{
namespace
{
Json::Value failure(const std::string &code)
{
    Json::Value body;
    body["ok"] = false;
    body["error"] = code;
    return body;
}

Json::Value success()
{
    Json::Value body;
    body["ok"] = true;
    return body;
}
}  // namespace

Json::Value AdminService::listCategories()
{
    auto response = success();
    response["categories"] = repositories::resultToJson(
        drogon::app().getDbClient()->execSqlSync(
            "SELECT * FROM report_categories ORDER BY name"));
    return response;
}

Json::Value AdminService::createCategory(const auth::UserContext &user,
                                         const Json::Value &body)
{
    if (!auth::isAdmin(user) || !validation::hasString(body, "name"))
    {
        return failure("forbidden");
    }

    drogon::app().getDbClient()->execSqlSync(
        "INSERT INTO report_categories (name, description) VALUES (?, ?)",
        body["name"].asString(),
        body.get("description", "").asString());
    return success();
}

Json::Value AdminService::listAreas()
{
    auto response = success();
    response["areas"] = repositories::resultToJson(
        drogon::app().getDbClient()->execSqlSync("SELECT * FROM areas ORDER BY name"));
    return response;
}

Json::Value AdminService::createArea(const auth::UserContext &user,
                                     const Json::Value &body)
{
    if (!auth::isAdmin(user) || !validation::hasString(body, "name") ||
        !body["boundary_geojson"].isObject())
    {
        return failure("invalid_area");
    }

    Json::StreamWriterBuilder writer;
    drogon::app().getDbClient()->execSqlSync(
        "INSERT INTO areas (name, description, boundary_geojson) "
        "VALUES (?, ?, CAST(? AS JSON))",
        body["name"].asString(),
        body.get("description", "").asString(),
        Json::writeString(writer, body["boundary_geojson"]));
    return success();
}

Json::Value AdminService::listTeams()
{
    auto response = success();
    response["teams"] = repositories::resultToJson(
        drogon::app().getDbClient()->execSqlSync(
            "SELECT t.*, tc.name AS category_name, a.name AS area_name "
            "FROM teams t JOIN team_categories tc ON tc.id = t.team_category_id "
            "LEFT JOIN areas a ON a.id = t.area_id ORDER BY t.name"));
    return response;
}

Json::Value AdminService::createTeam(const auth::UserContext &user,
                                     const Json::Value &body)
{
    if (!auth::isAdmin(user) || !validation::hasString(body, "name") ||
        !validation::hasNumber(body, "team_category_id"))
    {
        return failure("invalid_team");
    }

    if (body["area_id"].isNumeric())
    {
        drogon::app().getDbClient()->execSqlSync(
            "INSERT INTO teams (team_category_id, area_id, name, description) "
            "VALUES (?, ?, ?, ?)",
            body["team_category_id"].asInt64(),
            body["area_id"].asInt64(),
            body["name"].asString(),
            body.get("description", "").asString());
    }
    else
    {
        drogon::app().getDbClient()->execSqlSync(
            "INSERT INTO teams (team_category_id, name, description) VALUES (?, ?, ?)",
            body["team_category_id"].asInt64(),
            body["name"].asString(),
            body.get("description", "").asString());
    }
    return success();
}

Json::Value AdminService::overviewStats(const auth::UserContext &user)
{
    if (!auth::canManageReports(user))
    {
        return failure("forbidden");
    }

    auto db = drogon::app().getDbClient();
    auto response = success();
    response["reports_by_status"] = repositories::resultToJson(db->execSqlSync(
        "SELECT status, COUNT(*) AS total FROM reports GROUP BY status"));
    response["reports_by_area"] = repositories::resultToJson(db->execSqlSync(
        "SELECT COALESCE(a.name, 'Unassigned') AS area, COUNT(*) AS total "
        "FROM reports r LEFT JOIN areas a ON a.id = r.area_id "
        "GROUP BY COALESCE(a.name, 'Unassigned')"));
    response["avg_resolution_hours"] = repositories::resultToJson(db->execSqlSync(
        "SELECT AVG(TIMESTAMPDIFF(HOUR, created_at, updated_at)) AS value "
        "FROM reports WHERE status IN ('RESOLVED', 'CLOSED')"));
    return response;
}
}  // namespace visione::services