//! Integration tests for FlashDNS
//!
//! Run with: cargo test -p flashdns-server --test integration -- --ignored

use std::sync::Arc;

use flashdns_api::proto::{ListRecordsRequest, ListRecordsResponse, ListZonesRequest, ListZonesResponse};
use flashdns_api::{RecordService, ZoneService};
use flashdns_server::metadata::DnsMetadataStore;
use flashdns_server::record_service::RecordServiceImpl;
use flashdns_server::zone_service::ZoneServiceImpl;
use flashdns_types::{Record, RecordData, RecordType, Ttl, Zone, ZoneName};
use tonic::{Request, Response};

/// Test zone and record lifecycle via DnsMetadataStore
#[tokio::test]
#[ignore = "Integration test"]
async fn test_zone_and_record_lifecycle() {
    let metadata = Arc::new(DnsMetadataStore::new_in_memory());

    // 1. Create zone
    let zone_name = ZoneName::new("example.com").unwrap();
    let zone = Zone::new(zone_name, "test-org", "test-project");
    metadata.save_zone(&zone).await.unwrap();

    // 2. Verify zone was created
    let loaded_zone = metadata
        .load_zone("test-org", "test-project", "example.com.")
        .await
        .unwrap();
    assert!(loaded_zone.is_some());
    assert_eq!(loaded_zone.unwrap().id, zone.id);

    // 3. Add A record
    let record_data = RecordData::a_from_str("192.168.1.100").unwrap();
    let mut record = Record::new(zone.id, "www", record_data);
    record.ttl = Ttl::new(300).unwrap();
    metadata.save_record(&record).await.unwrap();

    // 4. Verify record via metadata
    let loaded = metadata
        .load_record(&zone.id, "www", RecordType::A)
        .await
        .unwrap();
    assert!(loaded.is_some());
    let loaded_record = loaded.unwrap();
    assert_eq!(loaded_record.id, record.id);
    assert_eq!(loaded_record.ttl.as_secs(), 300);

    // 5. List records
    let records = metadata.list_records(&zone.id).await.unwrap();
    assert_eq!(records.len(), 1);

    // 6. Add more records
    let ipv6: std::net::Ipv6Addr = "2001:db8::1".parse().unwrap();
    let aaaa_data = RecordData::Aaaa { address: ipv6.octets() };
    let aaaa_record = Record::new(zone.id, "www", aaaa_data);
    metadata.save_record(&aaaa_record).await.unwrap();

    let mx_data = RecordData::Mx {
        preference: 10,
        exchange: "mail.example.com.".to_string(),
    };
    let mx_record = Record::new(zone.id, "@", mx_data);
    metadata.save_record(&mx_record).await.unwrap();

    let txt_data = RecordData::Txt {
        text: "v=spf1 include:_spf.example.com ~all".to_string(),
    };
    let txt_record = Record::new(zone.id, "@", txt_data);
    metadata.save_record(&txt_record).await.unwrap();

    // 7. List all records - should have 4
    let all_records = metadata.list_records(&zone.id).await.unwrap();
    assert_eq!(all_records.len(), 4);

    // 8. List records by name
    let www_records = metadata.list_records_by_name(&zone.id, "www").await.unwrap();
    assert_eq!(www_records.len(), 2); // A + AAAA

    let root_records = metadata.list_records_by_name(&zone.id, "@").await.unwrap();
    assert_eq!(root_records.len(), 2); // MX + TXT

    // 9. Cleanup - delete records
    metadata.delete_record(&record).await.unwrap();
    metadata.delete_record(&aaaa_record).await.unwrap();
    metadata.delete_record(&mx_record).await.unwrap();
    metadata.delete_record(&txt_record).await.unwrap();

    // 10. Verify records deleted
    let remaining = metadata.list_records(&zone.id).await.unwrap();
    assert_eq!(remaining.len(), 0);

    // 11. Delete zone
    metadata.delete_zone(&zone).await.unwrap();

    // 12. Verify zone deleted
    let deleted_zone = metadata
        .load_zone("test-org", "test-project", "example.com.")
        .await
        .unwrap();
    assert!(deleted_zone.is_none());
}

/// Test multi-zone scenario
#[tokio::test]
#[ignore = "Integration test"]
async fn test_multi_zone_scenario() {
    let metadata = Arc::new(DnsMetadataStore::new_in_memory());

    // Create multiple zones
    let zone1 = Zone::new(
        ZoneName::new("example.com").unwrap(),
        "org1",
        "project1",
    );
    let zone2 = Zone::new(
        ZoneName::new("example.org").unwrap(),
        "org1",
        "project1",
    );
    let zone3 = Zone::new(
        ZoneName::new("other.net").unwrap(),
        "org2",
        "project2",
    );

    metadata.save_zone(&zone1).await.unwrap();
    metadata.save_zone(&zone2).await.unwrap();
    metadata.save_zone(&zone3).await.unwrap();

    // Add records to each zone
    let a1 = Record::new(
        zone1.id,
        "www",
        RecordData::a_from_str("10.0.0.1").unwrap(),
    );
    let a2 = Record::new(
        zone2.id,
        "www",
        RecordData::a_from_str("10.0.0.2").unwrap(),
    );
    let a3 = Record::new(
        zone3.id,
        "www",
        RecordData::a_from_str("10.0.0.3").unwrap(),
    );

    metadata.save_record(&a1).await.unwrap();
    metadata.save_record(&a2).await.unwrap();
    metadata.save_record(&a3).await.unwrap();

    // List zones for org1 - should have 2
    let org1_zones = metadata.list_zones("org1", None).await.unwrap();
    assert_eq!(org1_zones.len(), 2);

    // List zones for org1/project1 - should have 2
    let org1_p1_zones = metadata.list_zones("org1", Some("project1")).await.unwrap();
    assert_eq!(org1_p1_zones.len(), 2);

    // List zones for org2 - should have 1
    let org2_zones = metadata.list_zones("org2", None).await.unwrap();
    assert_eq!(org2_zones.len(), 1);

    // Load zone by ID
    let loaded = metadata.load_zone_by_id(&zone1.id).await.unwrap();
    assert!(loaded.is_some());
    assert_eq!(loaded.unwrap().name.as_str(), "example.com.");

    // Cleanup
    metadata.delete_zone_records(&zone1.id).await.unwrap();
    metadata.delete_zone_records(&zone2.id).await.unwrap();
    metadata.delete_zone_records(&zone3.id).await.unwrap();
    metadata.delete_zone(&zone1).await.unwrap();
    metadata.delete_zone(&zone2).await.unwrap();
    metadata.delete_zone(&zone3).await.unwrap();
}

/// Test record type coverage
#[tokio::test]
#[ignore = "Integration test"]
async fn test_record_type_coverage() {
    let metadata = Arc::new(DnsMetadataStore::new_in_memory());

    let zone = Zone::new(
        ZoneName::new("types.test").unwrap(),
        "test-org",
        "test-project",
    );
    metadata.save_zone(&zone).await.unwrap();

    // A record
    let a = Record::new(
        zone.id,
        "a",
        RecordData::a_from_str("192.168.1.1").unwrap(),
    );
    metadata.save_record(&a).await.unwrap();

    // AAAA record
    let ipv6: std::net::Ipv6Addr = "2001:db8::1".parse().unwrap();
    let aaaa = Record::new(
        zone.id,
        "aaaa",
        RecordData::Aaaa { address: ipv6.octets() },
    );
    metadata.save_record(&aaaa).await.unwrap();

    // CNAME record
    let cname = Record::new(
        zone.id,
        "cname",
        RecordData::Cname {
            target: "target.types.test.".to_string(),
        },
    );
    metadata.save_record(&cname).await.unwrap();

    // MX record
    let mx = Record::new(
        zone.id,
        "mx",
        RecordData::Mx {
            preference: 10,
            exchange: "mail.types.test.".to_string(),
        },
    );
    metadata.save_record(&mx).await.unwrap();

    // TXT record
    let txt = Record::new(
        zone.id,
        "txt",
        RecordData::Txt {
            text: "test value".to_string(),
        },
    );
    metadata.save_record(&txt).await.unwrap();

    // NS record
    let ns = Record::new(
        zone.id,
        "ns",
        RecordData::Ns {
            nameserver: "ns1.types.test.".to_string(),
        },
    );
    metadata.save_record(&ns).await.unwrap();

    // SRV record
    let srv = Record::new(
        zone.id,
        "_sip._tcp",
        RecordData::Srv {
            priority: 10,
            weight: 20,
            port: 5060,
            target: "sip.types.test.".to_string(),
        },
    );
    metadata.save_record(&srv).await.unwrap();

    // PTR record
    let ptr = Record::new(
        zone.id,
        "1.1.168.192.in-addr.arpa",
        RecordData::Ptr {
            target: "host.types.test.".to_string(),
        },
    );
    metadata.save_record(&ptr).await.unwrap();

    // CAA record
    let caa = Record::new(
        zone.id,
        "caa",
        RecordData::Caa {
            flags: 0,
            tag: "issue".to_string(),
            value: "letsencrypt.org".to_string(),
        },
    );
    metadata.save_record(&caa).await.unwrap();

    // Verify all records
    let records = metadata.list_records(&zone.id).await.unwrap();
    assert_eq!(records.len(), 9);

    // Cleanup
    metadata.delete_zone_records(&zone.id).await.unwrap();
    metadata.delete_zone(&zone).await.unwrap();
}

/// Manual test documentation for DNS query resolution
///
/// To test DNS query resolution manually:
///
/// 1. Start the server:
///    ```
///    cargo run -p flashdns-server
///    ```
///
/// 2. Create a zone via gRPC (using grpcurl):
///    ```
///    grpcurl -plaintext -d '{"name":"example.com","org_id":"test","project_id":"test"}' \
///      localhost:9053 flashdns.ZoneService/CreateZone
///    ```
///
/// 3. Add an A record:
///    ```
///    grpcurl -plaintext -d '{"zone_id":"<zone_id>","name":"www","record_type":"A","ttl":300,"data":{"a":{"address":"192.168.1.100"}}}' \
///      localhost:9053 flashdns.RecordService/CreateRecord
///    ```
///
/// 4. Query via DNS:
///    ```
///    dig @127.0.0.1 -p 5353 www.example.com A
///    ```
///
/// Expected: Answer section should contain www.example.com with 192.168.1.100
#[tokio::test]
#[ignore = "Integration test - requires DNS handler and manual verification"]
async fn test_dns_query_resolution_docs() {
    // This test documents manual testing procedure
    // Actual automated DNS query testing would require:
    // 1. Starting DnsHandler on a test port
    // 2. Using a DNS client library to send queries
    // 3. Verifying responses

    // For CI, we verify the components individually:
    // - DnsMetadataStore (tested above)
    // - DnsQueryHandler logic (unit tested in handler.rs)
    // - Wire format (handled by trust-dns-proto)
}

/// Test zone listing pagination
#[tokio::test]
#[ignore = "Integration test"]
async fn test_zone_pagination() {
    let metadata = Arc::new(DnsMetadataStore::new_in_memory());
    let zone_service = ZoneServiceImpl::new(metadata.clone());

    // Create 15 zones
    for i in 1..=15 {
        let zone_name = format!("zone{:02}.example.com", i);
        let zone = Zone::new(
            ZoneName::new(&zone_name).unwrap(),
            "test-org",
            "test-project",
        );
        metadata.save_zone(&zone).await.unwrap();
    }

    // Test 1: List first page with page_size=5
    let request = Request::new(ListZonesRequest {
        org_id: "test-org".to_string(),
        project_id: "test-project".to_string(),
        name_filter: String::new(),
        page_size: 5,
        page_token: String::new(),
    });

    let response: Response<ListZonesResponse> = zone_service.list_zones(request).await.unwrap();
    let page1 = response.into_inner();

    assert_eq!(page1.zones.len(), 5);
    assert!(!page1.next_page_token.is_empty(), "Should have next page token");

    // Test 2: Fetch second page using next_page_token
    let request = Request::new(ListZonesRequest {
        org_id: "test-org".to_string(),
        project_id: "test-project".to_string(),
        name_filter: String::new(),
        page_size: 5,
        page_token: page1.next_page_token.clone(),
    });

    let response: Response<ListZonesResponse> = zone_service.list_zones(request).await.unwrap();
    let page2 = response.into_inner();

    assert_eq!(page2.zones.len(), 5);
    assert!(!page2.next_page_token.is_empty(), "Should have next page token");

    // Test 3: Fetch third page
    let request = Request::new(ListZonesRequest {
        org_id: "test-org".to_string(),
        project_id: "test-project".to_string(),
        name_filter: String::new(),
        page_size: 5,
        page_token: page2.next_page_token.clone(),
    });

    let response: Response<ListZonesResponse> = zone_service.list_zones(request).await.unwrap();
    let page3 = response.into_inner();

    assert_eq!(page3.zones.len(), 5);
    assert!(page3.next_page_token.is_empty(), "Should NOT have next page token (last page)");

    // Test 4: Verify zone IDs are unique across pages
    let all_zone_ids: Vec<String> = page1
        .zones
        .iter()
        .chain(page2.zones.iter())
        .chain(page3.zones.iter())
        .map(|z| z.id.clone())
        .collect();

    assert_eq!(all_zone_ids.len(), 15);
    let unique_ids: std::collections::HashSet<_> = all_zone_ids.iter().collect();
    assert_eq!(unique_ids.len(), 15, "All zone IDs should be unique");

    // Test 5: Default page size (page_size=0 should use default of 50)
    let request = Request::new(ListZonesRequest {
        org_id: "test-org".to_string(),
        project_id: "test-project".to_string(),
        name_filter: String::new(),
        page_size: 0,
        page_token: String::new(),
    });

    let response: Response<ListZonesResponse> = zone_service.list_zones(request).await.unwrap();
    let default_page = response.into_inner();

    assert_eq!(default_page.zones.len(), 15, "Should return all zones with default page size");
    assert!(default_page.next_page_token.is_empty());
}

/// Test record listing pagination
#[tokio::test]
#[ignore = "Integration test"]
async fn test_record_pagination() {
    let metadata = Arc::new(DnsMetadataStore::new_in_memory());
    let record_service = RecordServiceImpl::new(metadata.clone());

    // Create a zone
    let zone = Zone::new(
        ZoneName::new("example.com").unwrap(),
        "test-org",
        "test-project",
    );
    metadata.save_zone(&zone).await.unwrap();

    // Create 25 A records
    for i in 1..=25 {
        let name = format!("host{:02}", i);
        let address = format!("10.0.0.{}", i);
        let record_data = RecordData::a_from_str(&address).unwrap();
        let record = Record::new(zone.id, &name, record_data);
        metadata.save_record(&record).await.unwrap();
    }

    // Test 1: List first page with page_size=10
    let request = Request::new(ListRecordsRequest {
        zone_id: zone.id.to_string(),
        name_filter: String::new(),
        type_filter: String::new(),
        page_size: 10,
        page_token: String::new(),
    });

    let response: Response<ListRecordsResponse> = record_service.list_records(request).await.unwrap();
    let page1 = response.into_inner();

    assert_eq!(page1.records.len(), 10);
    assert!(!page1.next_page_token.is_empty(), "Should have next page token");

    // Test 2: Fetch second page
    let request = Request::new(ListRecordsRequest {
        zone_id: zone.id.to_string(),
        name_filter: String::new(),
        type_filter: String::new(),
        page_size: 10,
        page_token: page1.next_page_token.clone(),
    });

    let response: Response<ListRecordsResponse> = record_service.list_records(request).await.unwrap();
    let page2 = response.into_inner();

    assert_eq!(page2.records.len(), 10);
    assert!(!page2.next_page_token.is_empty(), "Should have next page token");

    // Test 3: Fetch third page (partial)
    let request = Request::new(ListRecordsRequest {
        zone_id: zone.id.to_string(),
        name_filter: String::new(),
        type_filter: String::new(),
        page_size: 10,
        page_token: page2.next_page_token.clone(),
    });

    let response: Response<ListRecordsResponse> = record_service.list_records(request).await.unwrap();
    let page3 = response.into_inner();

    assert_eq!(page3.records.len(), 5, "Last page should have remaining 5 records");
    assert!(page3.next_page_token.is_empty(), "Should NOT have next page token (last page)");

    // Test 4: Verify all record IDs are unique
    let all_record_ids: Vec<String> = page1
        .records
        .iter()
        .chain(page2.records.iter())
        .chain(page3.records.iter())
        .map(|r| r.id.clone())
        .collect();

    assert_eq!(all_record_ids.len(), 25);
    let unique_ids: std::collections::HashSet<_> = all_record_ids.iter().collect();
    assert_eq!(unique_ids.len(), 25, "All record IDs should be unique");

    // Test 5: Pagination with name filter
    let request = Request::new(ListRecordsRequest {
        zone_id: zone.id.to_string(),
        name_filter: "host1".to_string(), // Matches host1, host10-19
        type_filter: String::new(),
        page_size: 5,
        page_token: String::new(),
    });

    let response: Response<ListRecordsResponse> = record_service.list_records(request).await.unwrap();
    let filtered_page1 = response.into_inner();

    assert_eq!(filtered_page1.records.len(), 5);
    assert!(!filtered_page1.next_page_token.is_empty());

    // Continue to second page of filtered results
    let request = Request::new(ListRecordsRequest {
        zone_id: zone.id.to_string(),
        name_filter: "host1".to_string(),
        type_filter: String::new(),
        page_size: 5,
        page_token: filtered_page1.next_page_token.clone(),
    });

    let response: Response<ListRecordsResponse> = record_service.list_records(request).await.unwrap();
    let filtered_page2 = response.into_inner();

    assert!(filtered_page2.records.len() <= 6); // host1 + host10-19 = 11 total, so 5+6
    assert!(filtered_page2.next_page_token.is_empty());

    // Verify all filtered records contain "host1"
    for record in filtered_page1.records.iter().chain(filtered_page2.records.iter()) {
        assert!(record.name.contains("host1"), "Filtered record should match name filter");
    }
}