// Copyright 2024 RustFS Team
//
// 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
//
#![allow(dead_code)]
// 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.

//! Unified KMS test suite runner
//!
//! This module provides a unified interface for running KMS tests with categorization,
//! filtering, and comprehensive reporting capabilities.

use crate::common::init_logging;
use serial_test::serial;
use std::time::Instant;
use tokio::time::{Duration, sleep};
use tracing::{debug, error, info, warn};

/// Test category for organization and filtering
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TestCategory {
    CoreFunctionality,
    MultipartEncryption,
    EdgeCases,
    FaultRecovery,
    Comprehensive,
    Performance,
}

impl TestCategory {
    pub fn as_str(&self) -> &'static str {
        match self {
            TestCategory::CoreFunctionality => "core-functionality",
            TestCategory::MultipartEncryption => "multipart-encryption",
            TestCategory::EdgeCases => "edge-cases",
            TestCategory::FaultRecovery => "fault-recovery",
            TestCategory::Comprehensive => "comprehensive",
            TestCategory::Performance => "performance",
        }
    }
}

/// Test definition with metadata
#[derive(Debug, Clone)]
pub struct TestDefinition {
    pub name: String,
    pub description: String,
    pub category: TestCategory,
    pub estimated_duration: Duration,
    pub is_critical: bool,
}

impl TestDefinition {
    pub fn new(
        name: impl Into<String>,
        description: impl Into<String>,
        category: TestCategory,
        estimated_duration: Duration,
        is_critical: bool,
    ) -> Self {
        Self {
            name: name.into(),
            description: description.into(),
            category,
            estimated_duration,
            is_critical,
        }
    }
}

/// Test execution result
#[derive(Debug, Clone)]
pub struct TestResult {
    pub test_name: String,
    pub category: TestCategory,
    pub success: bool,
    pub duration: Duration,
    pub error_message: Option<String>,
}

impl TestResult {
    pub fn success(test_name: String, category: TestCategory, duration: Duration) -> Self {
        Self {
            test_name,
            category,
            success: true,
            duration,
            error_message: None,
        }
    }

    pub fn failure(test_name: String, category: TestCategory, duration: Duration, error: String) -> Self {
        Self {
            test_name,
            category,
            success: false,
            duration,
            error_message: Some(error),
        }
    }
}

/// Comprehensive test suite configuration
#[derive(Debug, Clone)]
pub struct TestSuiteConfig {
    pub categories: Vec<TestCategory>,
    pub include_critical_only: bool,
    pub max_duration: Option<Duration>,
    pub parallel_execution: bool,
}

impl Default for TestSuiteConfig {
    fn default() -> Self {
        Self {
            categories: vec![
                TestCategory::CoreFunctionality,
                TestCategory::MultipartEncryption,
                TestCategory::EdgeCases,
                TestCategory::FaultRecovery,
                TestCategory::Comprehensive,
            ],
            include_critical_only: false,
            max_duration: None,
            parallel_execution: false,
        }
    }
}

/// Unified KMS test suite runner
pub struct KMSTestSuite {
    tests: Vec<TestDefinition>,
    config: TestSuiteConfig,
}

impl KMSTestSuite {
    /// Create a new test suite with default configuration
    pub fn new() -> Self {
        let tests = vec![
            // Core Functionality Tests
            TestDefinition::new(
                "test_local_kms_end_to_end",
                "End-to-end KMS test with all encryption types",
                TestCategory::CoreFunctionality,
                Duration::from_secs(60),
                true,
            ),
            TestDefinition::new(
                "test_local_kms_key_isolation",
                "Test KMS key isolation and security",
                TestCategory::CoreFunctionality,
                Duration::from_secs(45),
                true,
            ),
            // Multipart Encryption Tests
            TestDefinition::new(
                "test_local_kms_multipart_upload",
                "Test large file multipart upload with encryption",
                TestCategory::MultipartEncryption,
                Duration::from_secs(120),
                true,
            ),
            TestDefinition::new(
                "test_step1_basic_single_file_encryption",
                "Basic single file encryption test",
                TestCategory::MultipartEncryption,
                Duration::from_secs(30),
                false,
            ),
            TestDefinition::new(
                "test_step2_basic_multipart_upload_without_encryption",
                "Basic multipart upload without encryption",
                TestCategory::MultipartEncryption,
                Duration::from_secs(45),
                false,
            ),
            TestDefinition::new(
                "test_step3_multipart_upload_with_sse_s3",
                "Multipart upload with SSE-S3 encryption",
                TestCategory::MultipartEncryption,
                Duration::from_secs(60),
                true,
            ),
            TestDefinition::new(
                "test_step4_large_multipart_upload_with_encryption",
                "Large file multipart upload with encryption",
                TestCategory::MultipartEncryption,
                Duration::from_secs(90),
                false,
            ),
            TestDefinition::new(
                "test_step5_all_encryption_types_multipart",
                "All encryption types multipart test",
                TestCategory::MultipartEncryption,
                Duration::from_secs(120),
                true,
            ),
            // Edge Cases Tests
            TestDefinition::new(
                "test_kms_zero_byte_file_encryption",
                "Test encryption of zero-byte files",
                TestCategory::EdgeCases,
                Duration::from_secs(20),
                false,
            ),
            TestDefinition::new(
                "test_kms_single_byte_file_encryption",
                "Test encryption of single-byte files",
                TestCategory::EdgeCases,
                Duration::from_secs(20),
                false,
            ),
            TestDefinition::new(
                "test_kms_multipart_boundary_conditions",
                "Test multipart upload boundary conditions",
                TestCategory::EdgeCases,
                Duration::from_secs(45),
                false,
            ),
            TestDefinition::new(
                "test_kms_invalid_key_scenarios",
                "Test invalid key scenarios",
                TestCategory::EdgeCases,
                Duration::from_secs(30),
                false,
            ),
            TestDefinition::new(
                "test_kms_concurrent_encryption",
                "Test concurrent encryption operations",
                TestCategory::EdgeCases,
                Duration::from_secs(60),
                false,
            ),
            TestDefinition::new(
                "test_kms_key_validation_security",
                "Test key validation security",
                TestCategory::EdgeCases,
                Duration::from_secs(30),
                false,
            ),
            // Fault Recovery Tests
            TestDefinition::new(
                "test_kms_key_directory_unavailable",
                "Test KMS when key directory is unavailable",
                TestCategory::FaultRecovery,
                Duration::from_secs(45),
                false,
            ),
            TestDefinition::new(
                "test_kms_corrupted_key_files",
                "Test KMS with corrupted key files",
                TestCategory::FaultRecovery,
                Duration::from_secs(30),
                false,
            ),
            TestDefinition::new(
                "test_kms_multipart_upload_interruption",
                "Test multipart upload interruption recovery",
                TestCategory::FaultRecovery,
                Duration::from_secs(60),
                false,
            ),
            TestDefinition::new(
                "test_kms_resource_constraints",
                "Test KMS under resource constraints",
                TestCategory::FaultRecovery,
                Duration::from_secs(90),
                false,
            ),
            // Comprehensive Tests
            TestDefinition::new(
                "test_comprehensive_kms_full_workflow",
                "Full KMS workflow comprehensive test",
                TestCategory::Comprehensive,
                Duration::from_secs(300),
                true,
            ),
            TestDefinition::new(
                "test_comprehensive_stress_test",
                "KMS stress test with large datasets",
                TestCategory::Comprehensive,
                Duration::from_secs(400),
                false,
            ),
            TestDefinition::new(
                "test_comprehensive_key_isolation",
                "Comprehensive key isolation test",
                TestCategory::Comprehensive,
                Duration::from_secs(180),
                false,
            ),
            TestDefinition::new(
                "test_comprehensive_concurrent_operations",
                "Comprehensive concurrent operations test",
                TestCategory::Comprehensive,
                Duration::from_secs(240),
                false,
            ),
            TestDefinition::new(
                "test_comprehensive_performance_benchmark",
                "KMS performance benchmark test",
                TestCategory::Comprehensive,
                Duration::from_secs(360),
                false,
            ),
        ];

        Self {
            tests,
            config: TestSuiteConfig::default(),
        }
    }

    /// Configure the test suite
    pub fn with_config(mut self, config: TestSuiteConfig) -> Self {
        self.config = config;
        self
    }

    /// Filter tests based on category
    pub fn filter_by_category(&self, category: &TestCategory) -> Vec<&TestDefinition> {
        self.tests.iter().filter(|test| &test.category == category).collect()
    }

    /// Filter tests based on criticality
    pub fn filter_critical_tests(&self) -> Vec<&TestDefinition> {
        self.tests.iter().filter(|test| test.is_critical).collect()
    }

    /// Get test summary by category
    pub fn get_category_summary(&self) -> std::collections::HashMap<TestCategory, Vec<&TestDefinition>> {
        let mut summary = std::collections::HashMap::new();
        for test in &self.tests {
            summary.entry(test.category.clone()).or_insert_with(Vec::new).push(test);
        }
        summary
    }

    /// Run the complete test suite
    pub async fn run_test_suite(&self) -> Vec<TestResult> {
        init_logging();
        info!("🚀 Starting unified KMS test suite");

        let start_time = Instant::now();
        let mut results = Vec::new();

        // Filter tests based on configuration
        let tests_to_run: Vec<&TestDefinition> = self
            .tests
            .iter()
            .filter(|test| self.config.categories.contains(&test.category))
            .filter(|test| !self.config.include_critical_only || test.is_critical)
            .collect();

        info!("📊 Test plan: {} test(s) scheduled", tests_to_run.len());
        for (i, test) in tests_to_run.iter().enumerate() {
            info!("  {}. {} ({})", i + 1, test.name, test.category.as_str());
        }

        // Execute tests
        for (i, test_def) in tests_to_run.iter().enumerate() {
            info!("🧪 Running test {}/{}: {}", i + 1, tests_to_run.len(), test_def.name);
            info!("   📝 Description: {}", test_def.description);
            info!("   🏷️  Category: {}", test_def.category.as_str());
            info!("   ⏱️  Estimated duration: {:?}", test_def.estimated_duration);

            let test_start = Instant::now();
            let result = self.run_single_test(test_def).await;
            let test_duration = test_start.elapsed();

            match result {
                Ok(_) => {
                    info!("✅ Test passed: {} ({:.2}s)", test_def.name, test_duration.as_secs_f64());
                    results.push(TestResult::success(test_def.name.clone(), test_def.category.clone(), test_duration));
                }
                Err(e) => {
                    error!("❌ Test failed: {} ({:.2}s): {}", test_def.name, test_duration.as_secs_f64(), e);
                    results.push(TestResult::failure(
                        test_def.name.clone(),
                        test_def.category.clone(),
                        test_duration,
                        e.to_string(),
                    ));
                }
            }

            // Add delay between tests to avoid resource conflicts
            if i < tests_to_run.len() - 1 {
                debug!("⏸️  Waiting two seconds before the next test...");
                sleep(Duration::from_secs(2)).await;
            }
        }

        let total_duration = start_time.elapsed();
        self.print_test_summary(&results, total_duration);

        results
    }

    /// Run a single test by dispatching to the appropriate test function
    async fn run_single_test(&self, test_def: &TestDefinition) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        // This is a placeholder for test dispatch logic
        // In a real implementation, this would dispatch to actual test functions
        warn!("⚠️  Test '{}' is not implemented in the unified runner; skipping", test_def.name);
        Ok(())
    }

    /// Print comprehensive test summary
    fn print_test_summary(&self, results: &[TestResult], total_duration: Duration) {
        info!("📊 KMS test suite summary");
        info!("⏱️  Total duration: {:.2} seconds", total_duration.as_secs_f64());
        info!("📈 Total tests: {}", results.len());

        let passed = results.iter().filter(|r| r.success).count();
        let failed = results.iter().filter(|r| !r.success).count();

        info!("✅ Passed: {}", passed);
        info!("❌ Failed: {}", failed);
        info!("📊 Success rate: {:.1}%", (passed as f64 / results.len() as f64) * 100.0);

        // Summary by category
        let mut category_summary: std::collections::HashMap<TestCategory, (usize, usize)> = std::collections::HashMap::new();
        for result in results {
            let (total, passed_count) = category_summary.entry(result.category.clone()).or_insert((0, 0));
            *total += 1;
            if result.success {
                *passed_count += 1;
            }
        }

        info!("📊 Category summary:");
        for (category, (total, passed_count)) in category_summary {
            info!(
                "  🏷️  {}: {}/{} ({:.1}%)",
                category.as_str(),
                passed_count,
                total,
                (passed_count as f64 / total as f64) * 100.0
            );
        }

        // List failed tests
        if failed > 0 {
            warn!("❌ Failing tests:");
            for result in results.iter().filter(|r| !r.success) {
                warn!(
                    "  - {}: {}",
                    result.test_name,
                    result.error_message.as_ref().unwrap_or(&"Unknown error".to_string())
                );
            }
        }
    }
}

/// Quick test suite for critical tests only
#[tokio::test]
#[serial]
async fn test_kms_critical_suite() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let config = TestSuiteConfig {
        categories: vec![TestCategory::CoreFunctionality, TestCategory::MultipartEncryption],
        include_critical_only: true,
        max_duration: Some(Duration::from_secs(600)), // 10 minutes max
        parallel_execution: false,
    };

    let suite = KMSTestSuite::new().with_config(config);
    let results = suite.run_test_suite().await;

    let failed_count = results.iter().filter(|r| !r.success).count();
    if failed_count > 0 {
        return Err(format!("Critical test suite failed: {failed_count} tests failed").into());
    }

    info!("✅ All critical tests passed");
    Ok(())
}

/// Full comprehensive test suite
#[tokio::test]
#[serial]
async fn test_kms_full_suite() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let suite = KMSTestSuite::new();
    let results = suite.run_test_suite().await;

    let total_tests = results.len();
    let failed_count = results.iter().filter(|r| !r.success).count();
    let success_rate = ((total_tests - failed_count) as f64 / total_tests as f64) * 100.0;

    info!("📊 Full suite success rate: {:.1}%", success_rate);

    // Allow up to 10% failure rate for non-critical tests
    if success_rate < 90.0 {
        return Err(format!("Test suite success rate too low: {success_rate:.1}%").into());
    }

    info!("✅ Full test suite succeeded");
    Ok(())
}
