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// Copyright 2021, 2022 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use anyhow::Context;
use mas_router::{PostAuthAction, Route, UrlBuilder};
use mas_storage::{
    compat::CompatSsoLoginRepository,
    oauth2::OAuth2AuthorizationGrantRepository,
    upstream_oauth2::{UpstreamOAuthLinkRepository, UpstreamOAuthProviderRepository},
    RepositoryAccess,
};
use mas_templates::{PostAuthContext, PostAuthContextInner};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Default, Debug, Clone)]
pub(crate) struct OptionalPostAuthAction {
    #[serde(flatten)]
    pub post_auth_action: Option<PostAuthAction>,
}

impl OptionalPostAuthAction {
    pub fn go_next_or_default<T: Route>(
        &self,
        url_builder: &UrlBuilder,
        default: &T,
    ) -> axum::response::Redirect {
        self.post_auth_action.as_ref().map_or_else(
            || url_builder.redirect(default),
            |action| action.go_next(url_builder),
        )
    }

    pub fn go_next(&self, url_builder: &UrlBuilder) -> axum::response::Redirect {
        self.go_next_or_default(url_builder, &mas_router::Index)
    }

    pub async fn load_context<'a>(
        &'a self,
        repo: &'a mut impl RepositoryAccess,
    ) -> anyhow::Result<Option<PostAuthContext>> {
        let Some(action) = self.post_auth_action.clone() else {
            return Ok(None);
        };
        let ctx = match action {
            PostAuthAction::ContinueAuthorizationGrant { id } => {
                let grant = repo
                    .oauth2_authorization_grant()
                    .lookup(id)
                    .await?
                    .context("Failed to load authorization grant")?;
                let grant = Box::new(grant);
                PostAuthContextInner::ContinueAuthorizationGrant { grant }
            }

            PostAuthAction::ContinueDeviceCodeGrant { id } => {
                let grant = repo
                    .oauth2_device_code_grant()
                    .lookup(id)
                    .await?
                    .context("Failed to load device code grant")?;
                let grant = Box::new(grant);
                PostAuthContextInner::ContinueDeviceCodeGrant { grant }
            }

            PostAuthAction::ContinueCompatSsoLogin { id } => {
                let login = repo
                    .compat_sso_login()
                    .lookup(id)
                    .await?
                    .context("Failed to load compat SSO login")?;
                let login = Box::new(login);
                PostAuthContextInner::ContinueCompatSsoLogin { login }
            }

            PostAuthAction::ChangePassword => PostAuthContextInner::ChangePassword,

            PostAuthAction::LinkUpstream { id } => {
                let link = repo
                    .upstream_oauth_link()
                    .lookup(id)
                    .await?
                    .context("Failed to load upstream OAuth 2.0 link")?;

                let provider = repo
                    .upstream_oauth_provider()
                    .lookup(link.provider_id)
                    .await?
                    .context("Failed to load upstream OAuth 2.0 provider")?;

                let provider = Box::new(provider);
                let link = Box::new(link);
                PostAuthContextInner::LinkUpstream { provider, link }
            }

            PostAuthAction::ManageAccount { .. } => PostAuthContextInner::ManageAccount,
        };

        Ok(Some(PostAuthContext {
            params: action.clone(),
            ctx,
        }))
    }
}