use crate::{
    get_user_from_token,
    routes::api::v1::{
        CreateGrant, UpdateAppHomepage, UpdateAppQuotaStatus, UpdateAppRedirect, UpdateAppScopes,
        UpdateAppTitle,
    },
    State,
};
use axum::{Extension, Json, extract::Path, response::IntoResponse};
use axum_extra::extract::CookieJar;
use tetratto_core::model::{
    apps::{AppQuota, ThirdPartyApp},
    oauth::{AuthGrant, PkceChallengeMethod},
    permissions::FinePermission,
    ApiReturn, Error,
};
use tetratto_shared::{hash::random_id, unix_epoch_timestamp};
use super::CreateApp;

pub async fn create_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Json(req): Json<CreateApp>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data
        .create_app(ThirdPartyApp::new(
            req.title,
            user.id,
            req.homepage,
            req.redirect,
        ))
        .await
    {
        Ok(s) => Json(ApiReturn {
            ok: true,
            message: "App created".to_string(),
            payload: s.id.to_string(),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn update_title_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<UpdateAppTitle>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.update_app_title(id, &user, &req.title).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "App updated".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn update_homepage_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<UpdateAppHomepage>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.update_app_homepage(id, &user, &req.homepage).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "App updated".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn update_redirect_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<UpdateAppRedirect>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.update_app_redirect(id, &user, &req.redirect).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "App updated".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn update_quota_status_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<UpdateAppQuotaStatus>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    if !user.permissions.check(FinePermission::MANAGE_APPS) {
        return Json(Error::NotAllowed.into());
    }

    match data.update_app_quota_status(id, req.quota_status).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "App updated".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn update_scopes_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<UpdateAppScopes>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.update_app_scopes(id, &user, req.scopes).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "App updated".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn delete_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.delete_app(id, &user).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "App deleted".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn grant_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<CreateGrant>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let mut user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    let app = match data.get_app_by_id(id).await {
        Ok(a) => a,
        Err(e) => return Json(e.into()),
    };

    if user.get_grant_by_app_id(id).is_some() {
        return Json(Error::MiscError("This app already has a grant".to_string()).into());
    }

    // check number of existing grants
    if app.quota_status == AppQuota::Limited && app.grants >= 5 {
        return Json(
            Error::MiscError(
                "This app has reached its limit. Tell the owner to apply for an extension"
                    .to_string(),
            )
            .into(),
        );
    }

    // ...
    let grant = AuthGrant {
        app: app.id,
        challenge: req.challenge,
        method: PkceChallengeMethod::S256,
        token: random_id(),
        last_updated: unix_epoch_timestamp(),
        scopes: app.scopes.clone(),
    };

    user.grants.push(grant.clone());
    match data.update_user_grants(user.id, user.grants).await {
        Ok(_) => {
            if let Err(e) = data.incr_app_grants(id).await {
                return Json(e.into());
            }

            Json(ApiReturn {
                ok: true,
                message: "User updated".to_string(),
                payload: Some(grant.token),
            })
        }
        Err(e) => Json(e.into()),
    }
}