use caldav_sync::{Config, CalDavResult};

#[cfg(test)]
mod config_tests {
    use super::*;

    #[test]
    fn test_default_config() -> CalDavResult<()> {
        let config = Config::default();
        assert_eq!(config.server.url, "https://caldav.example.com");
        assert_eq!(config.calendar.name, "calendar");
        assert_eq!(config.sync.interval, 300);
        config.validate()?;
        Ok(())
    }

    #[test]
    fn test_config_validation() -> CalDavResult<()> {
        let mut config = Config::default();
        
        // Should fail with empty credentials
        assert!(config.validate().is_err());
        
        config.server.username = "test_user".to_string();
        config.server.password = "test_pass".to_string();
        
        // Should succeed now
        assert!(config.validate().is_ok());
        Ok(())
    }
}

#[cfg(test)]
mod error_tests {
    use caldav_sync::{CalDavError, CalDavResult};

    #[test]
    fn test_error_retryable() {
        let network_error = CalDavError::Network(
            reqwest::Error::from(std::io::Error::new(std::io::ErrorKind::ConnectionRefused, "test"))
        );
        assert!(network_error.is_retryable());

        let auth_error = CalDavError::Authentication("Invalid credentials".to_string());
        assert!(!auth_error.is_retryable());

        let config_error = CalDavError::Config("Missing URL".to_string());
        assert!(!config_error.is_retryable());
    }

    #[test]
    fn test_error_classification() {
        let auth_error = CalDavError::Authentication("Invalid".to_string());
        assert!(auth_error.is_auth_error());

        let config_error = CalDavError::Config("Invalid".to_string());
        assert!(config_error.is_config_error());
    }
}

#[cfg(test)]
mod event_tests {
    use caldav_sync::event::{Event, EventStatus, EventType};
    use chrono::{DateTime, Utc, NaiveDate};

    #[test]
    fn test_event_creation() {
        let start = Utc::now();
        let end = start + chrono::Duration::hours(1);
        let event = Event::new("Test Event".to_string(), start, end);
        
        assert_eq!(event.summary, "Test Event");
        assert_eq!(event.start, start);
        assert_eq!(event.end, end);
        assert!(!event.all_day);
        assert_eq!(event.status, EventStatus::Confirmed);
        assert_eq!(event.event_type, EventType::Public);
    }

    #[test]
    fn test_all_day_event() {
        let date = NaiveDate::from_ymd_opt(2023, 12, 25).unwrap();
        let event = Event::new_all_day("Christmas".to_string(), date);
        
        assert_eq!(event.summary, "Christmas");
        assert!(event.all_day);
        assert!(event.occurs_on(date));
    }

    #[test]
    fn test_event_to_ical() -> caldav_sync::CalDavResult<()> {
        let event = Event::new(
            "Meeting".to_string(),
            DateTime::from_naive_utc_and_offset(
                chrono::NaiveDateTime::parse_from_str("20231225T100000", "%Y%m%dT%H%M%S").unwrap(),
                Utc
            ),
            DateTime::from_naive_utc_and_offset(
                chrono::NaiveDateTime::parse_from_str("20231225T110000", "%Y%m%dT%H%M%S").unwrap(),
                Utc
            ),
        );
        
        let ical = event.to_ical()?;
        assert!(ical.contains("SUMMARY:Meeting"));
        assert!(ical.contains("DTSTART:20231225T100000Z"));
        assert!(ical.contains("DTEND:20231225T110000Z"));
        assert!(ical.contains("BEGIN:VCALENDAR"));
        assert!(ical.contains("END:VCALENDAR"));
        Ok(())
    }
}

#[cfg(test)]
mod timezone_tests {
    use caldav_sync::timezone::TimezoneHandler;

    #[test]
    fn test_timezone_handler_creation() -> CalDavResult<()> {
        let handler = TimezoneHandler::new("UTC")?;
        assert_eq!(handler.default_timezone(), "UTC");
        Ok(())
    }

    #[test]
    fn test_timezone_validation() {
        assert!(TimezoneHandler::validate_timezone("UTC"));
        assert!(TimezoneHandler::validate_timezone("America/New_York"));
        assert!(TimezoneHandler::validate_timezone("Europe/London"));
        assert!(!TimezoneHandler::validate_timezone("Invalid/Timezone"));
    }

    #[test]
    fn test_ical_formatting() -> CalDavResult<()> {
        let handler = TimezoneHandler::default();
        let dt = DateTime::from_naive_utc_and_offset(
            chrono::NaiveDateTime::parse_from_str("20231225T100000", "%Y%m%dT%H%M%S").unwrap(),
            Utc
        );
        
        let ical_utc = handler.format_ical_datetime(dt, false)?;
        assert_eq!(ical_utc, "20231225T100000Z");
        
        let ical_date = handler.format_ical_date(dt);
        assert_eq!(ical_date, "20231225");
        Ok(())
    }
}

#[cfg(test)]
mod filter_tests {
    use caldav_sync::calendar_filter::{
        CalendarFilter, FilterRule, DateRangeFilter, KeywordFilter, 
        EventTypeFilter, EventStatusFilter, FilterBuilder
    };
    use caldav_sync::event::{Event, EventStatus, EventType};
    use chrono::{DateTime, Utc};

    #[test]
    fn test_date_range_filter() {
        let start = DateTime::from_naive_utc_and_offset(
            chrono::NaiveDateTime::parse_from_str("20231225T000000", "%Y%m%dT%H%M%S").unwrap(),
            Utc
        );
        let end = DateTime::from_naive_utc_and_offset(
            chrono::NaiveDateTime::parse_from_str("20231225T235959", "%Y%m%dT%H%M%S").unwrap(),
            Utc
        );
        
        let filter = DateRangeFilter::new(start, end);
        
        let event_start = DateTime::from_naive_utc_and_offset(
            chrono::NaiveDateTime::parse_from_str("20231225T100000", "%Y%m%dT%H%M%S").unwrap(),
            Utc
        );
        let event = Event::new("Test".to_string(), event_start, event_start + chrono::Duration::hours(1));
        assert!(filter.matches_event(&event));
        
        let event_outside = Event::new(
            "Test".to_string(),
            start - chrono::Duration::days(1),
            start - chrono::Duration::hours(23),
        );
        assert!(!filter_outside.matches_event(&event_outside));
    }

    #[test]
    fn test_keyword_filter() {
        let filter = KeywordFilter::new(vec!["meeting".to_string(), "important".to_string()], false);
        
        let event1 = Event::new("Team Meeting".to_string(), Utc::now(), Utc::now());
        assert!(filter.matches_event(&event1));
        
        let event2 = Event::new("Lunch".to_string(), Utc::now(), Utc::now());
        assert!(!filter.matches_event(&event2));
    }

    #[test]
    fn test_calendar_filter() {
        let mut filter = CalendarFilter::new(true); // OR logic
        filter.add_rule(FilterRule::Keywords(KeywordFilter::new(vec!["meeting".to_string()], false)));
        filter.add_rule(FilterRule::EventStatus(EventStatusFilter::new(vec![EventStatus::Cancelled])));
        
        let event1 = Event::new("Team Meeting".to_string(), Utc::now(), Utc::now());
        assert!(filter.matches_event(&event1)); // Matches keyword
        
        let mut event2 = Event::new("Holiday".to_string(), Utc::now(), Utc::now());
        event2.status = EventStatus::Cancelled;
        assert!(filter.matches_event(&event2)); // Matches status
        
        let event3 = Event::new("Lunch".to_string(), Utc::now(), Utc::now());
        assert!(!filter.matches_event(&event3)); // Matches neither
    }

    #[test]
    fn test_filter_builder() {
        let filter = FilterBuilder::new()
            .match_any(false) // AND logic
            .keywords(vec!["meeting".to_string()])
            .event_types(vec![EventType::Public])
            .build();
        
        let event = Event::new("Team Meeting".to_string(), Utc::now(), Utc::now());
        assert!(filter.matches_event(&event)); // Matches both conditions
    }
}

#[cfg(test)]
mod live_caldav_tests {
    use caldav_sync::Config;
    use caldav_sync::minicaldav_client::RealCalDavClient;
    use caldav_sync::event::Event;
    use chrono::{DateTime, Utc, Duration};
    use tokio;
    use std::path::PathBuf;

    /// Test basic CRUD operations on the import calendar using the test configuration
    #[tokio::test]
    async fn test_create_update_delete_event() -> Result<(), Box<dyn std::error::Error>> {
        println!("🧪 Starting CRUD test with import calendar...");
        
        // Load test configuration
        let config_path = PathBuf::from("config-test-import.toml");
        let config = Config::from_file(&config_path)?;
        
        // Validate configuration
        config.validate()?;
        
        // Create CalDAV client for target server (Nextcloud)
        let import_config = config.get_import_config().ok_or("No import configuration found")?;
        let target_client = RealCalDavClient::new(
            &import_config.target_server.url,
            &import_config.target_server.username,
            &import_config.target_server.password,
        ).await?;
        
        // Build target calendar URL
        let target_calendar_url = format!("{}/", import_config.target_server.url.trim_end_matches('/'));
        
        // Validate target calendar
        let is_valid = target_client.validate_target_calendar(&target_calendar_url).await?;
        assert!(is_valid, "Target calendar should be accessible");
        println!("✅ Target calendar is accessible");
        
        // Create test event for today
        let now = Utc::now();
        let today_start = now.date_naive().and_hms_opt(10, 0, 0).unwrap().and_utc();
        let today_end = today_start + Duration::hours(1);
        
        let test_uid = format!("test-event-{}", now.timestamp());
        let mut test_event = Event::new(
            format!("Test Event {}", test_uid),
            today_start,
            today_end,
        );
        test_event.uid = test_uid.clone();
        test_event.description = Some("This is a test event for CRUD operations".to_string());
        test_event.location = Some("Test Location".to_string());
        
        println!("📝 Creating test event: {}", test_event.summary);
        
        // Convert event to iCalendar format
        let ical_data = test_event.to_ical()?;
        
        // Test 1: Create event
        let create_result = target_client.put_event(
            &target_calendar_url,
            &test_uid,
            &ical_data,
            None // No ETag for creation
        ).await;
        
        match create_result {
            Ok(_) => println!("✅ Event created successfully"),
            Err(e) => {
                println!("❌ Failed to create event: {}", e);
                return Err(e.into());
            }
        }
        
        // Wait a moment to ensure the event is processed
        tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
        
        // Test 2: Verify event exists
        println!("🔍 Verifying event exists...");
        let etag_result = target_client.get_event_etag(&target_calendar_url, &test_uid).await;
        
        let original_etag = match etag_result {
            Ok(Some(etag)) => {
                println!("✅ Event verified, ETag: {}", etag);
                etag
            }
            Ok(None) => {
                println!("❌ Event not found after creation");
                return Err("Event not found after creation".into());
            }
            Err(e) => {
                println!("❌ Failed to verify event: {}", e);
                return Err(e.into());
            }
        }
        
        // Test 3: Update event (change date to tomorrow)
        println!("📝 Updating event for tomorrow...");
        let tomorrow_start = today_start + Duration::days(1);
        let tomorrow_end = tomorrow_start + Duration::hours(1);
        
        test_event.start = tomorrow_start;
        test_event.end = tomorrow_end;
        test_event.summary = format!("Test Event {} (Updated for Tomorrow)", test_uid);
        test_event.description = Some("This event has been updated to tomorrow".to_string());
        test_event.sequence += 1; // Increment sequence for update
        
        // Convert updated event to iCalendar format
        let updated_ical_data = test_event.to_ical()?;
        
        let update_result = target_client.put_event(
            &target_calendar_url,
            &test_uid,
            &updated_ical_data,
            Some(&original_etag) // Use ETag for update
        ).await;
        
        match update_result {
            Ok(_) => println!("✅ Event updated successfully"),
            Err(e) => {
                println!("❌ Failed to update event: {}", e);
                return Err(e.into());
            }
        }
        
        // Wait a moment to ensure the update is processed
        tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
        
        // Test 4: Verify event was updated (ETag should change)
        println!("🔍 Verifying event update...");
        let new_etag_result = target_client.get_event_etag(&target_calendar_url, &test_uid).await;
        
        match new_etag_result {
            Ok(Some(new_etag)) => {
                if new_etag != original_etag {
                    println!("✅ Event updated, new ETag: {}", new_etag);
                } else {
                    println!("⚠️  Event ETag didn't change after update");
                }
            }
            Ok(None) => {
                println!("❌ Event not found after update");
                return Err("Event not found after update".into());
            }
            Err(e) => {
                println!("❌ Failed to verify updated event: {}", e);
                return Err(e.into());
            }
        }
        
        // Test 5: Delete event
        println!("🗑️  Deleting event...");
        let delete_result = target_client.delete_event(
            &target_calendar_url,
            &test_uid,
            None // No ETag for deletion (let server handle it)
        ).await;
        
        match delete_result {
            Ok(_) => println!("✅ Event deleted successfully"),
            Err(e) => {
                println!("❌ Failed to delete event: {}", e);
                return Err(e.into());
            }
        }
        
        // Wait a moment to ensure the deletion is processed
        tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
        
        // Test 6: Verify event was deleted
        println!("🔍 Verifying event deletion...");
        let final_check = target_client.get_event_etag(&target_calendar_url, &test_uid).await;
        
        match final_check {
            Ok(None) => println!("✅ Event successfully deleted"),
            Ok(Some(etag)) => {
                println!("❌ Event still exists after deletion, ETag: {}", etag);
                return Err("Event still exists after deletion".into());
            }
            Err(e) => {
                println!("❌ Failed to verify deletion: {}", e);
                return Err(e.into());
            }
        }
        
        println!("🎉 All CRUD operations completed successfully!");
        Ok(())
    }

    /// Test HTTP error handling by attempting to delete a non-existent event
    #[tokio::test]
    async fn test_delete_nonexistent_event() -> Result<(), Box<dyn std::error::Error>> {
        println!("🧪 Testing deletion of non-existent event...");
        
        // Load test configuration
        let config_path = PathBuf::from("config-test-import.toml");
        let config = Config::from_file(&config_path)?;
        
        // Create CalDAV client for target server
        let import_config = config.get_import_config().ok_or("No import configuration found")?;
        let target_client = RealCalDavClient::new(
            &import_config.target_server.url,
            &import_config.target_server.username,
            &import_config.target_server.password,
        ).await?;
        
        // Build target calendar URL
        let target_calendar_url = format!("{}/", import_config.target_server.url.trim_end_matches('/'));
        
        // Try to delete a non-existent event
        let fake_uid = "non-existent-event-12345";
        println!("🗑️  Testing deletion of non-existent event: {}", fake_uid);
        
        let delete_result = target_client.delete_event(
            &target_calendar_url,
            fake_uid,
            None
        ).await;
        
        match delete_result {
            Ok(_) => {
                println!("✅ Non-existent event deletion handled gracefully (idempotent)");
                Ok(())
            }
            Err(e) => {
                println!("❌ Failed to handle non-existent event deletion gracefully: {}", e);
                Err(e.into())
            }
        }
    }

    /// Test event existence checking
    #[tokio::test]
    async fn test_event_existence_check() -> Result<(), Box<dyn std::error::Error>> {
        println!("🧪 Testing event existence check...");
        
        // Load test configuration
        let config_path = PathBuf::from("config-test-import.toml");
        let config = Config::from_file(&config_path)?;
        
        // Create CalDAV client for target server
        let import_config = config.get_import_config().ok_or("No import configuration found")?;
        let target_client = RealCalDavClient::new(
            &import_config.target_server.url,
            &import_config.target_server.username,
            &import_config.target_server.password,
        ).await?;
        
        // Build target calendar URL
        let target_calendar_url = format!("{}/", import_config.target_server.url.trim_end_matches('/'));
        
        // Test non-existent event
        let fake_uid = "non-existent-event-67890";
        let fake_event_url = format!("{}{}.ics", target_calendar_url, fake_uid);
        
        println!("🔍 Testing existence check for non-existent event: {}", fake_uid);
        
        let existence_result = target_client.check_event_exists(&fake_event_url).await;
        
        match existence_result {
            Ok(_) => {
                println!("❌ Non-existent event reported as existing");
                Err("Non-existent event reported as existing".into())
            }
            Err(e) => {
                println!("✅ Non-existent event correctly reported as missing: {}", e);
                Ok(())
            }
        }
    }
}

#[cfg(test)]
mod integration_tests {
    use super::*;

    #[test]
    fn test_library_initialization() -> CalDavResult<()> {
        caldav_sync::init()?;
        Ok(())
    }

    #[test]
    fn test_version() {
        assert!(!caldav_sync::VERSION.is_empty());
    }

    #[test]
    fn test_full_workflow() -> CalDavResult<()> {
        // Initialize library
        caldav_sync::init()?;
        
        // Create configuration
        let config = Config::default();
        
        // Validate configuration
        config.validate()?;
        
        // Create some test events
        let event1 = caldav_sync::event::Event::new(
            "Test Meeting".to_string(),
            Utc::now(),
            Utc::now() + chrono::Duration::hours(1),
        );
        
        let event2 = caldav_sync::event::Event::new_all_day(
            "Test Holiday".to_string(),
            chrono::NaiveDate::from_ymd_opt(2023, 12, 25).unwrap(),
        );
        
        // Test event serialization
        let ical1 = event1.to_ical()?;
        let ical2 = event2.to_ical()?;
        
        assert!(!ical1.is_empty());
        assert!(!ical2.is_empty());
        assert!(ical1.contains("SUMMARY:Test Meeting"));
        assert!(ical2.contains("SUMMARY:Test Holiday"));
        
        // Test filtering
        let filter = caldav_sync::calendar_filter::FilterBuilder::new()
            .keywords(vec!["test".to_string()])
            .build();
        
        assert!(filter.matches_event(&event1));
        assert!(filter.matches_event(&event2));
        
        Ok(())
    }
}