using JNPF.Extras.CollectiveOAuth.Cache;
using JNPF.Extras.CollectiveOAuth.Config;
using JNPF.Extras.CollectiveOAuth.Enums;
using JNPF.Extras.CollectiveOAuth.Models;
using JNPF.Extras.CollectiveOAuth.Utils;

namespace JNPF.Extras.CollectiveOAuth.Request;

public class StackOverflowAuthRequest : DefaultAuthRequest
{
    public StackOverflowAuthRequest(ClientConfig config) : base(config, new StackOverflowAuthSource())
    {
    }

    public StackOverflowAuthRequest(ClientConfig config, IAuthStateCache authStateCache)
        : base(config, new StackOverflowAuthSource(), authStateCache)
    {
    }

    protected override AuthToken getAccessToken(AuthCallback authCallback)
    {
        string accessTokenUrl = this.accessTokenUrl(authCallback.code);

        var reqHeaders = new Dictionary<string, object>
        {
            { "Content-Type", "application/x-www-form-urlencoded" },
        };
        var reqParams = accessTokenUrl.parseUrlObject();

        var response = HttpUtils.RequestPost(source.accessToken(), reqParams.spellParams(), reqHeaders);

        var accessTokenObject = response.parseObject();
        this.checkResponse(accessTokenObject);

        var authToken = new AuthToken();
        authToken.accessToken = accessTokenObject.getString("access_token");
        authToken.expireIn = accessTokenObject.getInt32("expires");
        return authToken;
    }

    protected override AuthUser getUserInfo(AuthToken authToken)
    {
        string userInfoUrl = UrlBuilder.fromBaseUrl(this.source.userInfo())
            .queryParam("access_token", authToken.accessToken)
            .queryParam("site", "stackoverflow")
            .queryParam("key", this.config.stackOverflowKey)
            .build();

        var response = HttpUtils.RequestGet(userInfoUrl);
        var responseObj = response.parseObject();
        this.checkResponse(responseObj);
        var userObj = responseObj.getString("items").parseListObject()[0];

        var authUser = new AuthUser();
        authUser.uuid = userObj.getString("user_id");
        authUser.username = userObj.getString("username");
        authUser.nickname = userObj.getString("display_name");
        authUser.avatar = userObj.getString("profile_image");
        authUser.location = userObj.getString("location");

        authUser.gender = AuthUserGender.UNKNOWN;
        authUser.token = authToken;
        authUser.source = source.getName();
        authUser.originalUser = responseObj;
        authUser.originalUserStr = response;
        return authUser;
    }

    /**
     * 返回带{@code state}参数的授权url，授权回调时会带上这个{@code state}
     *
     * @param state state 验证授权流程的参数，可以防止csrf
     * @return 返回授权地址
     * @since 1.9.3
     */

    public override string authorize(string state)
    {
        return UrlBuilder.fromBaseUrl(source.authorize())
            .queryParam("response_type", "code")
            .queryParam("client_id", config.clientId)
            .queryParam("redirect_uri", config.redirectUri)
            .queryParam("scope", config.scope.IsNullOrWhiteSpace() ? "read_inbox" : config.scope)
            .queryParam("state", getRealState(state))
            .build();
    }


    /**
     * 检查响应内容是否正确
     *
     * @param object 请求响应内容
     */
    private void checkResponse(Dictionary<string, object> dic)
    {
        if (dic.ContainsKey("error"))
        {
            throw new Exception($"{dic.getString("error_description")}");
        }
    }
}