/*
 * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
 *
 * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
 */

use std::time::{Duration, Instant};

use ahash::{AHashMap, HashMap, HashSet};
use common::config::server::ServerProtocol;

use http::management::queue::Message;
use mail_auth::MX;
use mail_parser::DateTime;
use reqwest::{Method, StatusCode, header::AUTHORIZATION};

use crate::{
    jmap::ManagementApi,
    smtp::{DnsCache, TestSMTP, session::TestSession},
};
use smtp::queue::{QueueId, Status, manager::SpawnQueue};

const LOCAL: &str = r#"
[storage]
directory = "local"

[directory."local"]
type = "memory"

[[directory."local".principals]]
name = "admin"
type = "admin"
description = "Superuser"
secret = "secret"
class = "admin"

[queue.schedule.default]
retry = "1000s"
notify = "2000s"
expire = "3000s"
queue-name = "default"

[session.rcpt]
relay = true
max-recipients = 100

[session.extensions]
dsn = true
future-release = "1h"
"#;

const REMOTE: &str = r#"
[session.ehlo]
reject-non-fqdn = false

[session.rcpt]
relay = true
"#;

#[derive(serde::Deserialize, Debug)]
#[allow(dead_code)]
pub(super) struct List<T> {
    pub items: Vec<T>,
    pub total: usize,
}

#[tokio::test]
#[serial_test::serial]
async fn manage_queue() {
    // Enable logging
    crate::enable_logging();

    // Start remote test server
    let mut remote = TestSMTP::new("smtp_manage_queue_remote", REMOTE).await;
    let _rx = remote.start(&[ServerProtocol::Smtp]).await;
    let remote_core = remote.build_smtp();

    // Start local management interface
    let local = TestSMTP::new("smtp_manage_queue_local", LOCAL).await;

    // Add mock DNS entries
    let core = local.build_smtp();
    core.mx_add(
        "foobar.org",
        vec![MX {
            exchanges: vec!["mx1.foobar.org".to_string()],
            preference: 10,
        }],
        Instant::now() + Duration::from_secs(10),
    );

    core.ipv4_add(
        "mx1.foobar.org",
        vec!["127.0.0.1".parse().unwrap()],
        Instant::now() + Duration::from_secs(10),
    );

    let _rx_manage = local.start(&[ServerProtocol::Http]).await;

    // Send test messages
    let envelopes = HashMap::from_iter([
        (
            "a",
            (
                "bill1@foobar.net",
                vec![
                    "rcpt1@example1.org",
                    "rcpt1@example2.org",
                    "rcpt1@example2.org",
                ],
            ),
        ),
        (
            "b",
            (
                "bill2@foobar.net",
                vec!["rcpt3@example1.net", "rcpt4@example1.net"],
            ),
        ),
        (
            "c",
            (
                "bill3@foobar.net",
                vec![
                    "rcpt5@example1.com",
                    "rcpt6@example2.com",
                    "rcpt7@example2.com",
                    "rcpt8@example3.com",
                    "rcpt9@example4.com",
                ],
            ),
        ),
        ("d", ("bill4@foobar.net", vec!["delay@foobar.org"])),
        ("e", ("bill5@foobar.net", vec!["john@foobar.org"])),
        ("f", ("", vec!["success@foobar.org", "delay@foobar.org"])),
    ]);
    let mut session = local.new_session();
    local
        .queue_receiver
        .queue_rx
        .spawn(local.server.inner.clone());
    session.data.remote_ip_str = "10.0.0.1".into();
    session.eval_session_params().await;
    session.ehlo("foobar.net").await;
    for test_num in 0..6 {
        let env_id = char::from(b'a' + test_num).to_string();
        let hold_for = ((test_num + 1) as u32) * 100;
        let (sender, recipients) = envelopes.get(env_id.as_str()).unwrap();
        session
            .send_message(
                &if env_id != "f" {
                    format!("<{sender}> ENVID={env_id} HOLDFOR={hold_for}")
                } else {
                    format!("<{sender}> ENVID={env_id}")
                },
                recipients,
                "test:no_dkim",
                "250",
            )
            .await;
    }

    // Expect delivery to success@foobar.org
    tokio::time::sleep(Duration::from_millis(100)).await;
    assert_eq!(
        remote
            .queue_receiver
            .consume_message(&remote_core)
            .await
            .message
            .recipients
            .into_iter()
            .map(|r| r.address().to_string())
            .collect::<Vec<_>>(),
        vec!["success@foobar.org"]
    );

    // Fetch and validate messages
    let api = ManagementApi::default();
    let ids = api
        .request::<List<QueueId>>(Method::GET, "/api/queue/messages")
        .await
        .unwrap()
        .unwrap_data()
        .items;
    assert_eq!(ids.len(), 6);
    let mut id_map = AHashMap::new();
    let mut id_map_rev = AHashMap::new();
    let mut test_search = String::new();
    for (message, id) in api.get_messages(&ids).await.into_iter().zip(ids) {
        let message = message.unwrap();
        let env_id = message.env_id.as_ref().unwrap().clone();

        // Validate return path and recipients
        let (sender, recipients) = envelopes.get(env_id.as_str()).unwrap();
        assert_eq!(&message.return_path, sender);
        'outer: for recipient in recipients {
            for rcpt in &message.recipients {
                if &rcpt.address == recipient {
                    continue 'outer;
                }
            }
            panic!("Recipient {recipient} not found in message.");
        }

        // Validate status and datetimes
        let created = message.created.to_timestamp();
        let hold_for = (env_id.as_bytes().first().unwrap() - b'a' + 1) as i64 * 100;
        let next_retry = created + hold_for;
        let next_notify = created + 2000 + hold_for;
        let expires = created + 3000 + hold_for;
        for rcpt in &message.recipients {
            if env_id == "c" {
                let mut dt = *rcpt.next_retry.as_ref().unwrap();
                dt.second -= 1;
                test_search = dt.to_rfc3339();
            }
            if env_id != "f" {
                // HOLDFOR messages
                assert_eq!(rcpt.retry_num, 0);
                assert_timestamp(
                    rcpt.next_retry.as_ref().unwrap(),
                    next_retry,
                    "retry",
                    &message,
                );
                assert_timestamp(
                    rcpt.next_notify.as_ref().unwrap(),
                    next_notify,
                    "notify",
                    &message,
                );
                assert_timestamp(&rcpt.expires.unwrap(), expires, "expires", &message);
                assert_eq!(&rcpt.status, &Status::Scheduled, "{message:#?}");
            } else if rcpt.address == "success@foobar.org" {
                assert_eq!(rcpt.retry_num, 0);
                assert!(
                    matches!(&rcpt.status, Status::Completed(_)),
                    "{:?}",
                    rcpt.status
                );
            } else {
                assert_eq!(rcpt.retry_num, 1);
                assert!(
                    matches!(&rcpt.status, Status::TemporaryFailure(_)),
                    "{:?}",
                    rcpt.status
                );
            }
        }

        id_map.insert(env_id.clone(), id);
        id_map_rev.insert(id, env_id);
    }
    assert_eq!(id_map.len(), 6);

    // Test list search
    for (query, expected_ids) in [
        (
            "/api/queue/messages?from=bill1@foobar.net".to_string(),
            vec!["a"],
        ),
        (
            "/api/queue/messages?to=foobar.org".to_string(),
            vec!["d", "e", "f"],
        ),
        (
            "/api/queue/messages?from=bill3@foobar.net&to=rcpt5@example1.com".to_string(),
            vec!["c"],
        ),
        (
            format!("/api/queue/messages?before={test_search}"),
            vec!["a", "b"],
        ),
        (
            format!("/api/queue/messages?after={test_search}"),
            vec!["d", "e", "f", "c"],
        ),
    ] {
        let expected_ids = HashSet::from_iter(expected_ids.into_iter().map(|s| s.to_string()));
        let ids = api
            .request::<List<QueueId>>(Method::GET, &query)
            .await
            .unwrap()
            .unwrap_data()
            .items
            .into_iter()
            .map(|id| id_map_rev.get(&id).unwrap().clone())
            .collect::<HashSet<_>>();
        assert_eq!(ids, expected_ids, "failed for {query}");
    }

    // Retry delivery
    for id in [id_map.get("e").unwrap(), id_map.get("f").unwrap()] {
        assert!(
            api.request::<bool>(Method::PATCH, &format!("/api/queue/messages/{id}",))
                .await
                .unwrap()
                .unwrap_data(),
        );
    }
    assert!(
        api.request::<bool>(
            Method::PATCH,
            &format!(
                "/api/queue/messages/{}?filter=example1.org&at=2200-01-01T00:00:00Z",
                id_map.get("a").unwrap(),
            )
        )
        .await
        .unwrap()
        .unwrap_data()
    );

    // Expect delivery to john@foobar.org
    tokio::time::sleep(Duration::from_millis(100)).await;
    assert_eq!(
        remote
            .queue_receiver
            .consume_message(&remote_core)
            .await
            .message
            .recipients
            .into_iter()
            .map(|r| r.address().to_string())
            .collect::<Vec<_>>(),
        vec!["john@foobar.org".to_string()]
    );

    // Message 'e' should be gone, 'f' should have retry_num == 2
    // while 'a' should have a retry time of 2200-01-01T00:00:00Z for example1.org
    let mut messages = api
        .get_messages(&[
            *id_map.get("e").unwrap(),
            *id_map.get("f").unwrap(),
            *id_map.get("a").unwrap(),
        ])
        .await
        .into_iter();
    assert_eq!(messages.next().unwrap(), None);
    assert_eq!(
        messages
            .next()
            .unwrap()
            .unwrap()
            .recipients
            .first()
            .unwrap()
            .retry_num,
        2
    );
    for rcpt in messages.next().unwrap().unwrap().recipients {
        let next_retry = rcpt.next_retry.as_ref().unwrap().to_rfc3339();
        let matched =
            ["2200-01-01T00:00:00Z", "2199-12-31T23:59:59Z"].contains(&next_retry.as_str());
        if rcpt.address.ends_with("example1.org") {
            assert!(matched, "{next_retry}");
        } else {
            assert!(!matched, "{next_retry}");
        }
    }

    // Cancel deliveries
    for (id, filter) in [
        ("a", "example2.org"),
        ("b", "example1.net"),
        ("c", "rcpt6@example2.com"),
        ("d", ""),
    ] {
        assert!(
            api.request::<bool>(
                Method::DELETE,
                &format!(
                    "/api/queue/messages/{}{}{}",
                    id_map.get(id).unwrap(),
                    if !filter.is_empty() { "?filter=" } else { "" },
                    filter
                )
            )
            .await
            .unwrap()
            .unwrap_data(),
            "failed for {id}: {filter}"
        );
    }
    assert_eq!(
        api.request::<List<QueueId>>(Method::GET, "/api/queue/messages")
            .await
            .unwrap()
            .unwrap_data()
            .items
            .len(),
        3
    );
    for (message, id) in api
        .get_messages(&[
            *id_map.get("a").unwrap(),
            *id_map.get("b").unwrap(),
            *id_map.get("c").unwrap(),
            *id_map.get("d").unwrap(),
        ])
        .await
        .into_iter()
        .zip(["a", "b", "c", "d"])
    {
        if ["b", "d"].contains(&id) {
            assert_eq!(message, None);
        } else {
            let message = message.unwrap();
            assert!(!message.recipients.is_empty());
            for rcpt in message.recipients {
                match id {
                    "a" => {
                        if rcpt.address.ends_with("example2.org") {
                            assert!(matches!(&rcpt.status, Status::PermanentFailure(_)));
                        } else {
                            assert!(matches!(&rcpt.status, Status::Scheduled));
                        }
                    }
                    "c" => {
                        if rcpt.address.ends_with("example2.com") {
                            if rcpt.address == "rcpt6@example2.com" {
                                assert!(matches!(&rcpt.status, Status::PermanentFailure(_)));
                            } else {
                                assert!(matches!(&rcpt.status, Status::Scheduled));
                            }
                        } else {
                            assert!(matches!(&rcpt.status, Status::Scheduled));
                        }
                    }
                    _ => unreachable!(),
                }
            }
        }
    }

    // Bulk cancel
    assert_eq!(
        api.request::<List<Message>>(Method::GET, "/api/queue/messages?values=1")
            .await
            .unwrap()
            .unwrap_data()
            .items
            .len(),
        3
    );
    assert!(
        api.request::<bool>(Method::DELETE, "/api/queue/messages?text=example2.com")
            .await
            .unwrap()
            .unwrap_data()
    );
    tokio::time::sleep(Duration::from_millis(100)).await;
    assert_eq!(
        api.request::<List<QueueId>>(Method::GET, "/api/queue/messages")
            .await
            .unwrap()
            .unwrap_data()
            .items
            .len(),
        2
    );
    assert!(
        api.request::<bool>(Method::DELETE, "/api/queue/messages")
            .await
            .unwrap()
            .unwrap_data()
    );
    tokio::time::sleep(Duration::from_millis(100)).await;
    assert_eq!(
        api.request::<List<QueueId>>(Method::GET, "/api/queue/messages")
            .await
            .unwrap()
            .unwrap_data()
            .items
            .len(),
        0
    );

    // Test authentication error
    assert_eq!(
        reqwest::Client::builder()
            .timeout(Duration::from_millis(500))
            .danger_accept_invalid_certs(true)
            .build()
            .unwrap()
            .get("https://127.0.0.1:9980/api/queue/messages")
            .header(AUTHORIZATION, "Basic YWRtaW46aGVsbG93b3JsZA==")
            .send()
            .await
            .unwrap()
            .status(),
        StatusCode::UNAUTHORIZED
    );
}

fn assert_timestamp(timestamp: &DateTime, expected: i64, ctx: &str, message: &Message) {
    let timestamp = timestamp.to_timestamp();
    let diff = timestamp - expected;
    if ![-2, -1, 0, 1, 2].contains(&diff) {
        panic!(
            "Got timestamp {timestamp}, expected {expected} (diff {diff} for {ctx}) for {message:?}"
        );
    }
}

impl ManagementApi {
    async fn get_messages(&self, ids: &[QueueId]) -> Vec<Option<Message>> {
        let mut results = Vec::with_capacity(ids.len());

        for id in ids {
            let message = self
                .request::<Message>(Method::GET, &format!("/api/queue/messages/{id}",))
                .await
                .unwrap()
                .try_unwrap_data();
            results.push(message);
        }

        results
    }
}