//! SSTable Cassandra compatibility validation framework
//!
//! NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
//! All validation methods that require SSTableWriter are disabled.

use std::process::Command;

use crate::{error::Error, Result};
use crate::{platform::Platform, Config};
use std::sync::Arc;

/// Validation framework for Cassandra compatibility
pub struct CassandraValidationFramework {
    /// Platform abstraction
    #[allow(dead_code)]
    platform: Arc<Platform>,
    /// Configuration
    #[allow(dead_code)]
    config: Config,
    /// Test data directory
    #[allow(dead_code)]
    test_dir: String,
}

impl CassandraValidationFramework {
    /// Create a new validation framework
    pub fn new(platform: Arc<Platform>, config: Config, test_dir: &str) -> Self {
        Self {
            platform,
            config,
            test_dir: test_dir.to_string(),
        }
    }

    /// Run comprehensive validation suite
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    /// Validation methods that require writing are now disabled.
    pub async fn run_full_validation(&self) -> Result<ValidationReport> {
        Err(Error::unsupported_format(
            "Validation removed in Issue #176 - SSTable writing (writer.rs) deleted",
        ))
    }

    /// Validate header format against Cassandra specification
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn validate_header_format(&self) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Header format validation removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Validate magic bytes are correct
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn validate_magic_bytes(&self) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Magic bytes validation removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Validate big-endian encoding
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn validate_endianness(&self) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Endianness validation removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Validate compression compatibility
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn validate_compression_compatibility(&self) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Compression validation removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Test specific compression algorithm
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn test_compression_algorithm(&self, _algorithm: &str) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Compression testing removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Validate round-trip compatibility with Cassandra
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn validate_round_trip(&self) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Round-trip validation removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Validate bloom filter compatibility
    ///
    /// NOTE: Issue #176 removed SSTable writing (writer.rs deleted).
    #[allow(dead_code)]
    async fn validate_bloom_filter_compatibility(&self) -> Result<TestResult> {
        Err(Error::unsupported_format(
            "Bloom filter validation removed in Issue #176 - requires SSTableWriter",
        ))
    }

    /// Use Cassandra tools to validate SSTable if available
    pub fn validate_with_cassandra_tools(&self, sstable_path: &str) -> Result<TestResult> {
        // Try to run sstabletool describe
        let output = Command::new("sstabletool")
            .arg("describe")
            .arg(sstable_path)
            .output();

        match output {
            Ok(result) => {
                if result.status.success() {
                    let stdout = String::from_utf8_lossy(&result.stdout);
                    Ok(TestResult::success(&format!(
                        "Cassandra tools validation passed: {}",
                        stdout.lines().take(3).collect::<Vec<_>>().join("; ")
                    )))
                } else {
                    let stderr = String::from_utf8_lossy(&result.stderr);
                    Ok(TestResult::failure(
                        "Cassandra tools validation failed",
                        &stderr,
                    ))
                }
            }
            Err(e) => Ok(TestResult::warning(
                "Cassandra tools not available",
                &format!("Could not run sstabletool: {}", e),
            )),
        }
    }
}

/// Test result representation
#[derive(Debug, Clone)]
pub struct TestResult {
    pub status: TestStatus,
    pub message: String,
    pub details: String,
}

impl TestResult {
    pub fn success(message: &str) -> Self {
        Self {
            status: TestStatus::Pass,
            message: message.to_string(),
            details: String::new(),
        }
    }

    pub fn failure(message: &str, details: &str) -> Self {
        Self {
            status: TestStatus::Fail,
            message: message.to_string(),
            details: details.to_string(),
        }
    }

    pub fn warning(message: &str, details: &str) -> Self {
        Self {
            status: TestStatus::Warning,
            message: message.to_string(),
            details: details.to_string(),
        }
    }
}

/// Test status enumeration
#[derive(Debug, Clone, PartialEq)]
pub enum TestStatus {
    Pass,
    Fail,
    Warning,
}

impl std::fmt::Display for TestStatus {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            TestStatus::Pass => write!(f, "PASS"),
            TestStatus::Fail => write!(f, "FAIL"),
            TestStatus::Warning => write!(f, "WARN"),
        }
    }
}

/// Comprehensive validation report
#[derive(Debug)]
pub struct ValidationReport {
    pub tests: Vec<(String, TestResult)>,
}

impl Default for ValidationReport {
    fn default() -> Self {
        Self::new()
    }
}

impl ValidationReport {
    pub fn new() -> Self {
        Self { tests: Vec::new() }
    }

    pub fn add_test_result(&mut self, test_name: &str, result: TestResult) {
        self.tests.push((test_name.to_string(), result));
    }

    pub fn is_successful(&self) -> bool {
        !self
            .tests
            .iter()
            .any(|(_, result)| result.status == TestStatus::Fail)
    }

    pub fn summary(&self) -> String {
        let total = self.tests.len();
        let passed = self
            .tests
            .iter()
            .filter(|(_, r)| r.status == TestStatus::Pass)
            .count();
        let failed = self
            .tests
            .iter()
            .filter(|(_, r)| r.status == TestStatus::Fail)
            .count();
        let warnings = self
            .tests
            .iter()
            .filter(|(_, r)| r.status == TestStatus::Warning)
            .count();

        format!(
            "Validation Summary: {}/{} passed, {} failed, {} warnings",
            passed, total, failed, warnings
        )
    }

    pub fn detailed_report(&self) -> String {
        let mut report = String::new();
        report.push_str("=== Cassandra Compatibility Validation Report ===\n\n");
        report.push_str(&format!("{}\n\n", self.summary()));

        for (test_name, result) in &self.tests {
            report.push_str(&format!(
                "[{}] {}: {}\n",
                result.status, test_name, result.message
            ));
            if !result.details.is_empty() {
                report.push_str(&format!("    Details: {}\n", result.details));
            }
            report.push('\n');
        }

        report
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;

    #[tokio::test]
    async fn test_validation_framework_creation() {
        let temp_dir = TempDir::new().unwrap();
        let config = Config::default();
        let platform = Arc::new(Platform::new(&config).await.unwrap());

        let framework =
            CassandraValidationFramework::new(platform, config, temp_dir.path().to_str().unwrap());

        // Basic functionality test
        assert!(!framework.test_dir.is_empty());
    }

    #[tokio::test]
    async fn test_validation_report() {
        let mut report = ValidationReport::new();

        report.add_test_result("test1", TestResult::success("All good"));
        report.add_test_result("test2", TestResult::failure("Bad news", "Details here"));

        assert!(!report.is_successful());
        assert!(report.summary().contains("1/2 passed"));
        assert!(report.detailed_report().contains("PASS"));
        assert!(report.detailed_report().contains("FAIL"));
    }
}
