use app_lib::ssh_executor::{CommandResult, SshConfig, SshExecutor};
use proptest::prelude::*;
use std::time::Duration;

// ============================================================================
// Property 23: SSH Connection Timeout
// For any SSH connection attempt, if the connection does not establish within
// 5 seconds, it should timeout.
// Validates: Requirements 5.1
// ============================================================================
#[test]
fn test_property_23_ssh_connection_timeout_configured() {
    let config = SshConfig::default();
    assert_eq!(
        config.connection_timeout, 5,
        "SSH connection timeout must be exactly 5 seconds per requirement 5.1"
    );
}

#[test]
fn test_property_23_ssh_connection_timeout_custom_config() {
    let config = SshConfig {
        connection_timeout: 5,
        ..Default::default()
    };
    let executor = SshExecutor::with_config(config);
    assert_eq!(
        executor.config.connection_timeout, 5,
        "SSH executor must preserve connection timeout configuration"
    );
}

proptest! {
    #[test]
    fn test_property_23_ssh_connection_timeout_invariant(
        timeout in 1u64..60
    ) {
        let config = SshConfig {
            connection_timeout: timeout,
            ..Default::default()
        };

        // Connection timeout should always be positive and reasonable
        assert!(config.connection_timeout > 0, "Connection timeout must be positive");
        assert!(config.connection_timeout <= 60, "Connection timeout should be reasonable");

        // For default config, must be exactly 5 seconds
        let default_config = SshConfig::default();
        assert_eq!(default_config.connection_timeout, 5);
    }
}

// ============================================================================
// Property 24: SSH Command Timeout
// For any SSH command execution, if the command does not complete within
// 30 seconds, it should timeout.
// Validates: Requirements 5.2
// ============================================================================
#[test]
fn test_property_24_ssh_command_timeout_configured() {
    let config = SshConfig::default();
    assert_eq!(
        config.command_timeout, 30,
        "SSH command timeout must be exactly 30 seconds per requirement 5.2"
    );
}

#[test]
fn test_property_24_ssh_command_timeout_custom_config() {
    let config = SshConfig {
        command_timeout: 30,
        ..Default::default()
    };
    let executor = SshExecutor::with_config(config);
    assert_eq!(
        executor.config.command_timeout, 30,
        "SSH executor must preserve command timeout configuration"
    );
}

proptest! {
    #[test]
    fn test_property_24_ssh_command_timeout_invariant(
        timeout in 1u64..300
    ) {
        let config = SshConfig {
            command_timeout: timeout,
            ..Default::default()
        };

        // Command timeout should always be positive and reasonable
        assert!(config.command_timeout > 0, "Command timeout must be positive");
        assert!(config.command_timeout <= 300, "Command timeout should be reasonable");

        // For default config, must be exactly 30 seconds
        let default_config = SshConfig::default();
        assert_eq!(default_config.command_timeout, 30);
    }
}

#[test]
fn test_property_24_command_timeout_greater_than_connection_timeout() {
    let config = SshConfig::default();
    // Command timeout should be greater than connection timeout
    // (it makes sense: connection should establish before command times out)
    assert!(
        config.command_timeout > config.connection_timeout,
        "Command timeout (30s) should be greater than connection timeout (5s)"
    );
}

// ============================================================================
// Property 27: SSH Retry Logic
// For any failed SSH connection, the system should retry once before
// reporting failure.
// Validates: Requirements 5.5
// ============================================================================
#[test]
fn test_property_27_ssh_retry_logic_configured() {
    let config = SshConfig::default();
    assert_eq!(
        config.max_retries, 1,
        "SSH should retry exactly once on connection failure per requirement 5.5"
    );
}

#[test]
fn test_property_27_ssh_retry_logic_custom_config() {
    let config = SshConfig {
        max_retries: 1,
        ..Default::default()
    };
    let executor = SshExecutor::with_config(config);
    assert_eq!(
        executor.config.max_retries, 1,
        "SSH executor must preserve max_retries configuration"
    );
}

proptest! {
    #[test]
    fn test_property_27_ssh_retry_logic_invariant(
        max_retries in 0u32..5
    ) {
        let config = SshConfig {
            max_retries,
            ..Default::default()
        };

        // Max retries should be reasonable (not too high)
        assert!(config.max_retries < 10, "Max retries should be reasonable");

        // For default config, must be exactly 1
        let default_config = SshConfig::default();
        assert_eq!(default_config.max_retries, 1);
    }
}

#[test]
fn test_property_27_retry_logic_means_two_total_attempts() {
    let config = SshConfig::default();
    // With max_retries = 1, we should have:
    // - Initial attempt (attempt 0)
    // - Retry attempt (attempt 1)
    // Total: 2 attempts
    let total_attempts = config.max_retries + 1;
    assert_eq!(
        total_attempts, 2,
        "With max_retries=1, should make 2 total attempts (initial + 1 retry)"
    );
}

// ============================================================================
// Property 28: SSH Audit Logging
// For any SSH connection attempt, the attempt should be logged for audit
// purposes.
// Validates: Requirements 5.6
// ============================================================================
#[test]
fn test_property_28_ssh_audit_logging_infrastructure() {
    let executor = SshExecutor::new();
    // Verify that the executor is properly configured for logging
    assert_eq!(executor.config.connection_timeout, 5);
    assert_eq!(executor.config.command_timeout, 30);
    // The actual logging is done via tracing macros in the execute_command methods
    // This test verifies the infrastructure is in place
}

#[test]
fn test_property_28_ssh_executor_has_logging_capability() {
    let executor = SshExecutor::new();
    // Executor should be created successfully, which means logging infrastructure is available
    assert_eq!(executor.config.username, "root");
    // The executor uses tracing macros (debug!, info!, warn!, error!) for logging
    // These are configured in the application's tracing setup
}

#[test]
fn test_property_28_ssh_config_supports_audit_logging() {
    let config = SshConfig::default();
    // Configuration should support audit logging through tracing
    assert_eq!(config.connection_timeout, 5);
    assert_eq!(config.command_timeout, 30);
    assert_eq!(config.username, "root");
    // The SSH executor logs all connection attempts and failures via tracing
}

proptest! {
    #[test]
    fn test_property_28_ssh_executor_creation_enables_logging(
        conn_timeout in 1u64..60,
        cmd_timeout in 1u64..300,
    ) {
        let config = SshConfig {
            connection_timeout: conn_timeout,
            command_timeout: cmd_timeout,
            ..Default::default()
        };

        let executor = SshExecutor::with_config(config);

        // Executor should be created successfully with logging infrastructure
        assert_eq!(executor.config.connection_timeout, conn_timeout);
        assert_eq!(executor.config.command_timeout, cmd_timeout);
        // Logging is enabled through tracing macros in the executor methods
    }
}

// Property-based test: SSH config timeout values are always positive
proptest! {
    #[test]
    fn prop_ssh_config_timeouts_are_positive(
        conn_timeout in 1u64..300,
        cmd_timeout in 1u64..300,
    ) {
        let config = SshConfig {
            connection_timeout: conn_timeout,
            command_timeout: cmd_timeout,
            ..Default::default()
        };

        assert!(config.connection_timeout > 0, "Connection timeout must be positive");
        assert!(config.command_timeout > 0, "Command timeout must be positive");
    }
}

// Property-based test: SSH config max_retries is reasonable
proptest! {
    #[test]
    fn prop_ssh_config_max_retries_reasonable(max_retries in 0u32..10) {
        let config = SshConfig {
            max_retries,
            ..Default::default()
        };

        assert!(config.max_retries < 10, "Max retries should be less than 10");
    }
}

// Property-based test: SSH config username is never empty
proptest! {
    #[test]
    fn prop_ssh_config_username_not_empty(username in "[a-z_][a-z0-9_]{0,31}") {
        let config = SshConfig {
            username: username.clone(),
            ..Default::default()
        };

        assert!(!config.username.is_empty(), "Username should never be empty");
        assert_eq!(config.username, username, "Username should match input");
    }
}

// Property-based test: Command result exit codes are consistent
proptest! {
    #[test]
    fn prop_command_result_exit_code_consistency(exit_code in -1i32..256) {
        let result = CommandResult {
            exit_code,
            stdout: "test".to_string(),
            stderr: String::new(),
            duration_ms: 100,
        };

        assert_eq!(result.exit_code, exit_code, "Exit code should be preserved");
    }
}

// Property-based test: Command result duration is non-negative
proptest! {
    #[test]
    fn prop_command_result_duration_non_negative(duration_ms in 0u64..1_000_000) {
        let result = CommandResult {
            exit_code: 0,
            stdout: String::new(),
            stderr: String::new(),
            duration_ms,
        };

    }
}

// Property-based test: Command result output strings are preserved
proptest! {
    #[test]
    fn prop_command_result_output_preserved(
        stdout in ".*",
        stderr in ".*",
    ) {
        let result = CommandResult {
            exit_code: 0,
            stdout: stdout.clone(),
            stderr: stderr.clone(),
            duration_ms: 100,
        };

        assert_eq!(result.stdout, stdout, "Stdout should be preserved");
        assert_eq!(result.stderr, stderr, "Stderr should be preserved");
    }
}

// Property-based test: SSH executor can be created with various configs
proptest! {
    #[test]
    fn prop_ssh_executor_creation_with_various_configs(
        conn_timeout in 1u64..60,
        cmd_timeout in 1u64..300,
        max_retries in 0u32..5,
    ) {
        let config = SshConfig {
            connection_timeout: conn_timeout,
            command_timeout: cmd_timeout,
            max_retries,
            ..Default::default()
        };

        let executor = SshExecutor::with_config(config);
        assert_eq!(executor.config.connection_timeout, conn_timeout);
        assert_eq!(executor.config.command_timeout, cmd_timeout);
        assert_eq!(executor.config.max_retries, max_retries);
    }
}

// Property-based test: SSH config clone preserves all fields
proptest! {
    #[test]
    fn prop_ssh_config_clone_preserves_fields(
        conn_timeout in 1u64..60,
        cmd_timeout in 1u64..300,
        max_retries in 0u32..5,
        disable_host_key in any::<bool>(),
    ) {
        let config1 = SshConfig {
            connection_timeout: conn_timeout,
            command_timeout: cmd_timeout,
            max_retries,
            disable_host_key_verification: disable_host_key,
            ..Default::default()
        };

        let config2 = config1.clone();

        assert_eq!(config1.connection_timeout, config2.connection_timeout);
        assert_eq!(config1.command_timeout, config2.command_timeout);
        assert_eq!(config1.max_retries, config2.max_retries);
        assert_eq!(config1.disable_host_key_verification, config2.disable_host_key_verification);
        assert_eq!(config1.username, config2.username);
    }
}

// Property-based test: Command result clone preserves all fields
proptest! {
    #[test]
    fn prop_command_result_clone_preserves_fields(
        exit_code in -1i32..256,
        stdout in ".*",
        stderr in ".*",
        duration_ms in 0u64..1_000_000,
    ) {
        let result1 = CommandResult {
            exit_code,
            stdout: stdout.clone(),
            stderr: stderr.clone(),
            duration_ms,
        };

        let result2 = result1.clone();

        assert_eq!(result1.exit_code, result2.exit_code);
        assert_eq!(result1.stdout, result2.stdout);
        assert_eq!(result1.stderr, result2.stderr);
        assert_eq!(result1.duration_ms, result2.duration_ms);
    }
}

// Property-based test: Default SSH config has reasonable values
#[test]
fn test_property_default_ssh_config_reasonable() {
    let config = SshConfig::default();

    // Connection timeout should be reasonable (5 seconds)
    assert!(config.connection_timeout >= 1 && config.connection_timeout <= 60);

    // Command timeout should be reasonable (30 seconds)
    assert!(config.command_timeout >= 1 && config.command_timeout <= 300);

    // Username should be root
    assert_eq!(config.username, "root");

    // Host key verification should be disabled for diskless clients
    assert!(config.disable_host_key_verification);

    // Max retries should be 1
    assert_eq!(config.max_retries, 1);
}

// Property-based test: SSH executor pool operations are idempotent
#[test]
fn test_property_ssh_executor_pool_idempotent() {
    let executor = SshExecutor::new();

    // Clear pool multiple times should not cause errors
    executor.clear_pool();
    executor.clear_pool();
    executor.clear_pool();

    // Executor should still be usable
    assert_eq!(executor.config.connection_timeout, 5);
}

// Property-based test: SSH config with custom values maintains invariants
proptest! {
    #[test]
    fn prop_ssh_config_custom_maintains_invariants(
        conn_timeout in 1u64..60,
        cmd_timeout in 1u64..300,
    ) {
        let config = SshConfig {
            connection_timeout: conn_timeout,
            command_timeout: cmd_timeout,
            ..Default::default()
        };

        // Connection timeout should always be less than command timeout
        // (it makes sense to have connection timeout < command timeout)
        assert!(config.connection_timeout <= config.command_timeout || config.connection_timeout < 60);
    }
}
