//! London School TDD Tests for Weaver Integration
//!
//! This module contains mock-driven tests following London TDD principles.
//! Tests validate that the correct telemetry interface contracts are followed.
//!
//! ## London TDD Principles Applied:
//! 1. Schema defines the contract (interface)
//! 2. Generate mocks from schema
//! 3. Write failing tests using mocks (Red)
//! 4. Implement to satisfy mocks (Green)
//! 5. Validate with Weaver live-check (Proof)
//!
//! ## CRITICAL: Two-Phase Validation
//! - Mock tests prove: Interface contract is correct
//! - Weaver validation proves: Runtime behavior is correct
//! - BOTH must pass for feature to ship

#![cfg(test)]

use crate::error::Result;

// NOTE: These imports will be uncommented once mocks are generated
// use crate::telemetry::generated::mocks::*;
// use mockall::predicate::*;

/// Test Result enum matching Weaver schema definition
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TestResult {
    Pass,
    Fail,
    Error,
}

impl TestResult {
    pub fn as_str(&self) -> &'static str {
        match self {
            TestResult::Pass => "pass",
            TestResult::Fail => "fail",
            TestResult::Error => "error",
        }
    }
}

/// Container State enum matching Weaver schema definition
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ContainerState {
    Creating,
    Running,
    Stopped,
    Failed,
}

impl ContainerState {
    pub fn as_str(&self) -> &'static str {
        match self {
            ContainerState::Creating => "creating",
            ContainerState::Running => "running",
            ContainerState::Stopped => "stopped",
            ContainerState::Failed => "failed",
        }
    }
}

// ============================================================================
// Test Execution Telemetry Tests
// ============================================================================

/// Test that test execution exports all required telemetry attributes
///
/// Schema Contract (from registry/core/test_execution.yaml):
/// - container.id: required
/// - container.image.name: required
/// - test.isolated: required (boolean)
/// - test.name: required
/// - test.result: required (enum: pass, fail, error)
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_execution_exports_required_telemetry() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange - Mock from schema
    let mut mock_span = MockTestExecutionSpanTrait::new();

    // Expect ALL required attributes to be set
    mock_span.expect_set_container_id()
        .with(eq("test-container-123"))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_container_image()
        .with(eq("alpine:latest"))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_test_name()
        .with(eq("my_test"))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_isolated()
        .with(eq(true))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_test_result()
        .with(eq(TestResult::Pass))
        .times(1)
        .returning(|_| ());

    // Act
    let result = execute_test_with_span(
        "my_test",
        "alpine:latest",
        mock_span
    ).await;

    // Assert
    assert!(result.is_ok());
    // Mock automatically verifies all expectations were met
    */

    Ok(())
}

/// Test that test execution handles missing required attributes
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_execution_fails_without_required_attributes() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_span = MockTestExecutionSpanTrait::new();

    // Mock expects container_id but test doesn't provide it
    // This should cause validation failure

    // Act
    let result = execute_test_with_incomplete_span(
        "my_test",
        mock_span
    ).await;

    // Assert - should fail because required attributes missing
    assert!(result.is_err());
    */

    Ok(())
}

/// Test that test result enum values match schema
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_result_enum_matches_schema() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_span = MockTestExecutionSpanTrait::new();

    // Test all valid enum values from schema
    for result in [TestResult::Pass, TestResult::Fail, TestResult::Error] {
        mock_span.expect_set_test_result()
            .with(eq(result.clone()))
            .times(1)
            .returning(|_| ());

        // Act
        let test_result = execute_test_with_result(result, mock_span.clone()).await;

        // Assert
        assert!(test_result.is_ok());
    }
    */

    Ok(())
}

// ============================================================================
// Container Lifecycle Telemetry Tests
// ============================================================================

/// Test that container lifecycle state transitions are tracked
///
/// Schema Contract (from registry/core/container_lifecycle.yaml):
/// - container.id: required
/// - container.state: required (enum: creating, running, stopped, failed)
/// - State transitions must be valid
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_container_lifecycle_tracked() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_lifecycle = MockContainerLifecycleSpanTrait::new();

    // Expect proper state transition sequence
    mock_lifecycle.expect_set_container_id()
        .with(eq("container-456"))
        .times(1)
        .returning(|_| ());

    // Valid state transition: Creating -> Running -> Stopped
    mock_lifecycle.expect_set_state()
        .with(eq(ContainerState::Creating))
        .times(1)
        .returning(|_| ());

    mock_lifecycle.expect_set_state()
        .with(eq(ContainerState::Running))
        .times(1)
        .returning(|_| ());

    mock_lifecycle.expect_set_state()
        .with(eq(ContainerState::Stopped))
        .times(1)
        .returning(|_| ());

    // Act
    let result = create_and_destroy_container(
        "alpine:latest",
        mock_lifecycle
    ).await;

    // Assert
    assert!(result.is_ok());
    // Mock verifies proper state transition sequence
    */

    Ok(())
}

/// Test that container failure states are tracked
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_container_failure_tracked() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_lifecycle = MockContainerLifecycleSpanTrait::new();

    mock_lifecycle.expect_set_container_id()
        .times(1)
        .returning(|_| ());

    // Expect transition to Failed state
    mock_lifecycle.expect_set_state()
        .with(eq(ContainerState::Creating))
        .times(1)
        .returning(|_| ());

    mock_lifecycle.expect_set_state()
        .with(eq(ContainerState::Failed))
        .times(1)
        .returning(|_| ());

    // Act
    let result = create_failing_container(mock_lifecycle).await;

    // Assert
    assert!(result.is_err());
    // Mock verifies Failed state was recorded
    */

    Ok(())
}

// ============================================================================
// Plugin System Telemetry Tests
// ============================================================================

/// Test that plugin registration exports telemetry
///
/// Schema Contract (from registry/core/plugin_system.yaml):
/// - plugin.name: required
/// - plugin.type: required
/// - plugin.version: required
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_plugin_registration_tracked() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_plugin_span = MockPluginRegistrationSpanTrait::new();

    mock_plugin_span.expect_set_plugin_name()
        .with(eq("test_plugin"))
        .times(1)
        .returning(|_| ());

    mock_plugin_span.expect_set_plugin_type()
        .with(eq("generic_container"))
        .times(1)
        .returning(|_| ());

    mock_plugin_span.expect_set_plugin_version()
        .with(eq("1.0.0"))
        .times(1)
        .returning(|_| ());

    // Act
    let result = register_plugin_with_span(
        "test_plugin",
        "generic_container",
        "1.0.0",
        mock_plugin_span
    ).await;

    // Assert
    assert!(result.is_ok());
    */

    Ok(())
}

/// Test that plugin lifecycle events are tracked
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_plugin_lifecycle_events_tracked() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_plugin_span = MockPluginLifecycleSpanTrait::new();

    // Expect lifecycle events: start, stop
    mock_plugin_span.expect_record_event()
        .with(eq("plugin.start"))
        .times(1)
        .returning(|_| ());

    mock_plugin_span.expect_record_event()
        .with(eq("plugin.stop"))
        .times(1)
        .returning(|_| ());

    // Act
    let result = run_plugin_lifecycle(mock_plugin_span).await;

    // Assert
    assert!(result.is_ok());
    */

    Ok(())
}

// ============================================================================
// Error Case Telemetry Tests
// ============================================================================

/// Test that error cases export proper telemetry
///
/// Schema Contract:
/// - test.result: "error" for errors
/// - error.type: required for error cases
/// - error.message: required for error cases
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_error_cases_export_telemetry() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_span = MockTestExecutionSpanTrait::new();

    mock_span.expect_set_test_result()
        .with(eq(TestResult::Error))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_error_type()
        .with(eq("container_start_failure"))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_error_message()
        .with(eq("Container failed to start"))
        .times(1)
        .returning(|_| ());

    // Act
    let result = execute_failing_test(mock_span).await;

    // Assert
    assert!(result.is_err());
    // Mock verifies error telemetry was exported
    */

    Ok(())
}

/// Test that timeout errors are tracked
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_timeout_errors_tracked() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_span = MockTestExecutionSpanTrait::new();

    mock_span.expect_set_test_result()
        .with(eq(TestResult::Error))
        .times(1)
        .returning(|_| ());

    mock_span.expect_set_error_type()
        .with(eq("timeout"))
        .times(1)
        .returning(|_| ());

    // Act
    let result = execute_test_with_timeout(mock_span).await;

    // Assert
    assert!(result.is_err());
    */

    Ok(())
}

// ============================================================================
// Metrics Telemetry Tests
// ============================================================================

/// Test that test duration metrics are recorded
///
/// Schema Contract (from registry/metrics/test_metrics.yaml):
/// - test.duration_ms: histogram, required
/// - test.name: attribute, required
/// - test.result: attribute, required
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_duration_metrics_recorded() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_metrics = MockTestMetricsRecorder::new();

    mock_metrics.expect_record_duration()
        .with(
            eq("my_test"),
            ge(0.0), // duration >= 0
            eq(true) // success
        )
        .times(1)
        .returning(|_, _, _| ());

    // Act
    let result = execute_test_with_metrics(
        "my_test",
        mock_metrics
    ).await;

    // Assert
    assert!(result.is_ok());
    */

    Ok(())
}

/// Test that container operation metrics are recorded
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_container_operation_metrics_recorded() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_metrics = MockContainerMetricsRecorder::new();

    mock_metrics.expect_record_operation()
        .with(
            eq("start"),
            ge(0.0), // duration >= 0
            eq("alpine")
        )
        .times(1)
        .returning(|_, _, _| ());

    // Act
    let result = start_container_with_metrics(
        "alpine:latest",
        mock_metrics
    ).await;

    // Assert
    assert!(result.is_ok());
    */

    Ok(())
}

// ============================================================================
// Integration Tests (Multiple Spans/Metrics)
// ============================================================================

/// Test complete test execution flow with all telemetry
#[tokio::test]
#[ignore = "Waiting for generated mocks from Weaver schema"]
async fn test_complete_execution_flow_telemetry() -> Result<()> {
    // TODO: Uncomment once mocks are generated
    /*
    // Arrange
    let mut mock_test_span = MockTestExecutionSpanTrait::new();
    let mut mock_container_span = MockContainerLifecycleSpanTrait::new();
    let mut mock_metrics = MockTestMetricsRecorder::new();

    // Expect proper coordination between spans
    // Test span expects all required attributes
    // Container span expects lifecycle states
    // Metrics recorder expects duration recording

    // Act
    let result = execute_complete_test_flow(
        mock_test_span,
        mock_container_span,
        mock_metrics
    ).await;

    // Assert
    assert!(result.is_ok());
    // All mocks verify their expectations
    */

    Ok(())
}

// ============================================================================
// Helper Functions (to be implemented by Core Coder)
// ============================================================================

// These functions will be implemented by Core Coder to satisfy mock tests

// async fn execute_test_with_span(
//     test_name: &str,
//     image: &str,
//     span: impl TestExecutionSpanTrait,
// ) -> Result<()> {
//     unimplemented!("To be implemented by Core Coder")
// }

// async fn create_and_destroy_container(
//     image: &str,
//     lifecycle: impl ContainerLifecycleSpanTrait,
// ) -> Result<()> {
//     unimplemented!("To be implemented by Core Coder")
// }

// async fn execute_failing_test(
//     span: impl TestExecutionSpanTrait,
// ) -> Result<()> {
//     unimplemented!("To be implemented by Core Coder")
// }
