use anyhow::Result;
use std::fs;
use std::process::Command;
use tempfile::TempDir;

// Import the template system
use weevil::templates::{TemplateManager, TemplateContext};

/// Helper to create a test template context
fn test_context(project_name: &str) -> TemplateContext {
    TemplateContext {
        project_name: project_name.to_string(),
        package_name: project_name.to_lowercase().replace("-", ""),
        creation_date: "2026-02-02T12:00:00Z".to_string(),
        weevil_version: "1.1.0-test".to_string(),
        template_name: "basic".to_string(),
    }
}

#[test]
fn test_template_manager_creation() {
    let mgr = TemplateManager::new();
    assert!(mgr.is_ok(), "TemplateManager should be created successfully");
}

#[test]
fn test_template_exists() {
    let mgr = TemplateManager::new().unwrap();
    
    assert!(mgr.template_exists("basic"), "basic template should exist");
    assert!(mgr.template_exists("testing"), "testing template should exist");
    assert!(!mgr.template_exists("nonexistent"), "nonexistent template should not exist");
}

#[test]
fn test_list_templates() {
    let mgr = TemplateManager::new().unwrap();
    let templates = mgr.list_templates();
    
    assert_eq!(templates.len(), 2, "Should have exactly 2 templates");
    assert!(templates.iter().any(|t| t.contains("basic")), "Should list basic template");
    assert!(templates.iter().any(|t| t.contains("testing")), "Should list testing template");
}

#[test]
fn test_basic_template_extraction() -> Result<()> {
    let mgr = TemplateManager::new()?;
    let temp_dir = TempDir::new()?;
    let project_dir = temp_dir.path().join("test-robot");
    fs::create_dir(&project_dir)?;
    
    let context = test_context("test-robot");
    let file_count = mgr.extract_template("basic", &project_dir, &context)?;
    
    assert!(file_count > 0, "Should extract at least one file from basic template");
    
    // Verify key files exist
    assert!(project_dir.join(".gitignore").exists(), ".gitignore should exist");
    assert!(project_dir.join("README.md").exists(), "README.md should exist (processed from .template)");
    assert!(project_dir.join(".weevil.toml").exists(), ".weevil.toml should exist (processed from .template)");
    assert!(project_dir.join("build.gradle").exists(), "build.gradle should exist (processed from .template)");
    assert!(project_dir.join("settings.gradle").exists(), "settings.gradle should exist");
    
    // Verify OpMode exists
    let opmode_path = project_dir.join("src/main/java/robot/opmodes/BasicOpMode.java");
    assert!(opmode_path.exists(), "BasicOpMode.java should exist");
    
    Ok(())
}

#[test]
fn test_testing_template_extraction() -> Result<()> {
    let mgr = TemplateManager::new()?;
    let temp_dir = TempDir::new()?;
    let project_dir = temp_dir.path().join("test-showcase");
    fs::create_dir(&project_dir)?;
    
    let mut context = test_context("test-showcase");
    context.template_name = "testing".to_string();
    
    let file_count = mgr.extract_template("testing", &project_dir, &context)?;
    
    assert!(file_count > 20, "Testing template should have 20+ files, got {}", file_count);
    
    // Verify documentation files
    assert!(project_dir.join("README.md").exists(), "README.md should exist");
    assert!(project_dir.join("DESIGN_AND_TEST_PLAN.md").exists(), "DESIGN_AND_TEST_PLAN.md should exist");
    assert!(project_dir.join("TESTING_GUIDE.md").exists(), "TESTING_GUIDE.md should exist");
    
    // Verify subsystems
    assert!(project_dir.join("src/main/java/robot/subsystems/MotorCycler.java").exists(), "MotorCycler.java should exist");
    assert!(project_dir.join("src/main/java/robot/subsystems/WallApproach.java").exists(), "WallApproach.java should exist");
    assert!(project_dir.join("src/main/java/robot/subsystems/TurnController.java").exists(), "TurnController.java should exist");
    
    // Verify hardware interfaces and implementations
    assert!(project_dir.join("src/main/java/robot/hardware/MotorController.java").exists(), "MotorController interface should exist");
    assert!(project_dir.join("src/main/java/robot/hardware/FtcMotorController.java").exists(), "FtcMotorController should exist");
    assert!(project_dir.join("src/main/java/robot/hardware/DistanceSensor.java").exists(), "DistanceSensor interface should exist");
    assert!(project_dir.join("src/main/java/robot/hardware/FtcDistanceSensor.java").exists(), "FtcDistanceSensor should exist");
    
    // Verify test files
    assert!(project_dir.join("src/test/java/robot/subsystems/MotorCyclerTest.java").exists(), "MotorCyclerTest.java should exist");
    assert!(project_dir.join("src/test/java/robot/subsystems/WallApproachTest.java").exists(), "WallApproachTest.java should exist");
    assert!(project_dir.join("src/test/java/robot/subsystems/TurnControllerTest.java").exists(), "TurnControllerTest.java should exist");
    
    // Verify mock implementations
    assert!(project_dir.join("src/test/java/robot/hardware/MockMotorController.java").exists(), "MockMotorController should exist");
    assert!(project_dir.join("src/test/java/robot/hardware/MockDistanceSensor.java").exists(), "MockDistanceSensor should exist");
    
    Ok(())
}

#[test]
fn test_template_variable_substitution() -> Result<()> {
    let mgr = TemplateManager::new()?;
    let temp_dir = TempDir::new()?;
    let project_dir = temp_dir.path().join("my-test-robot");
    fs::create_dir(&project_dir)?;
    
    let context = test_context("my-test-robot");
    mgr.extract_template("basic", &project_dir, &context)?;
    
    // Check README.md for variable substitution
    let readme_path = project_dir.join("README.md");
    let readme_content = fs::read_to_string(readme_path)?;
    
    assert!(readme_content.contains("my-test-robot"), "README should contain project name");
    assert!(readme_content.contains("1.1.0-test"), "README should contain weevil version");
    assert!(!readme_content.contains("{{PROJECT_NAME}}"), "README should not contain template variable");
    assert!(!readme_content.contains("{{WEEVIL_VERSION}}"), "README should not contain template variable");
    
    // Check .weevil.toml for variable substitution
    let weevil_toml = project_dir.join(".weevil.toml");
    let toml_content = fs::read_to_string(weevil_toml)?;
    
    assert!(toml_content.contains("my-test-robot"), ".weevil.toml should contain project name");
    assert!(!toml_content.contains("{{PROJECT_NAME}}"), ".weevil.toml should not contain template variable");
    
    Ok(())
}

#[test]
fn test_invalid_template_extraction() {
    let mgr = TemplateManager::new().unwrap();
    let temp_dir = TempDir::new().unwrap();
    let project_dir = temp_dir.path().join("test-robot");
    fs::create_dir(&project_dir).unwrap();
    
    let context = test_context("test-robot");
    let result = mgr.extract_template("nonexistent", &project_dir, &context);
    
    assert!(result.is_err(), "Should fail for nonexistent template");
}

#[test]
fn test_package_name_sanitization() {
    let context1 = test_context("my-robot");
    assert_eq!(context1.package_name, "myrobot", "Hyphens should be removed");
    
    let context2 = test_context("team_1234_bot");
    assert_eq!(context2.package_name, "team1234bot", "Underscores should be removed");
}

/// Integration test: Create a project with testing template and run gradle tests
/// This is marked with #[ignore] by default since it requires:
/// - Java installed
/// - Network access (first time to download gradle wrapper)
/// - Takes ~1-2 minutes to run
/// 
/// Run with: cargo test test_testing_template_gradle_build -- --ignored --nocapture
#[test]
#[ignore]
fn test_testing_template_gradle_build() -> Result<()> {
    println!("Testing complete gradle build and test execution...");
    
    let mgr = TemplateManager::new()?;
    let temp_dir = TempDir::new()?;
    let project_dir = temp_dir.path().join("gradle-test-robot");
    fs::create_dir(&project_dir)?;
    
    // Extract testing template
    let mut context = test_context("gradle-test-robot");
    context.template_name = "testing".to_string();
    
    let file_count = mgr.extract_template("testing", &project_dir, &context)?;
    println!("Extracted {} files from testing template", file_count);
    
    // Check if gradlew exists (should be in testing template)
    let gradlew = if cfg!(windows) {
        project_dir.join("gradlew.bat")
    } else {
        project_dir.join("gradlew")
    };
    
    if !gradlew.exists() {
        println!("WARNING: gradlew not found in template, skipping gradle test");
        return Ok(());
    }
    
    // Make gradlew executable on Unix
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        let mut perms = fs::metadata(&gradlew)?.permissions();
        perms.set_mode(0o755);
        fs::set_permissions(&gradlew, perms)?;
    }
    
    println!("Running gradle test...");
    
    // Run gradlew test
    let output = Command::new(&gradlew)
        .arg("test")
        .current_dir(&project_dir)
        .output()?;
    
    println!("=== Gradle Output ===");
    println!("{}", String::from_utf8_lossy(&output.stdout));
    
    if !output.status.success() {
        println!("=== Gradle Errors ===");
        println!("{}", String::from_utf8_lossy(&output.stderr));
        panic!("Gradle tests failed with status: {}", output.status);
    }
    
    // Verify test output mentions 45 tests
    let stdout = String::from_utf8_lossy(&output.stdout);
    
    // Look for test success indicators
    let has_success = stdout.contains("BUILD SUCCESSFUL") || 
                      stdout.contains("45 tests") ||
                      stdout.to_lowercase().contains("tests passed");
    
    assert!(has_success, "Gradle test output should indicate success");
    
    println!("✓ All 45 tests passed!");
    
    Ok(())
}

/// Test that basic template creates a valid directory structure
#[test]
fn test_basic_template_directory_structure() -> Result<()> {
    let mgr = TemplateManager::new()?;
    let temp_dir = TempDir::new()?;
    let project_dir = temp_dir.path().join("structure-test");
    fs::create_dir(&project_dir)?;
    
    let context = test_context("structure-test");
    mgr.extract_template("basic", &project_dir, &context)?;
    
    // Verify directory structure
    assert!(project_dir.join("src").is_dir(), "src directory should exist");
    assert!(project_dir.join("src/main").is_dir(), "src/main directory should exist");
    assert!(project_dir.join("src/main/java").is_dir(), "src/main/java directory should exist");
    assert!(project_dir.join("src/main/java/robot").is_dir(), "src/main/java/robot directory should exist");
    assert!(project_dir.join("src/main/java/robot/opmodes").is_dir(), "opmodes directory should exist");
    assert!(project_dir.join("src/test/java/robot").is_dir(), "test directory should exist");
    
    Ok(())
}

/// Test that .gitignore is not named ".gitignore.template"
#[test]
fn test_gitignore_naming() -> Result<()> {
    let mgr = TemplateManager::new()?;
    let temp_dir = TempDir::new()?;
    let project_dir = temp_dir.path().join("gitignore-test");
    fs::create_dir(&project_dir)?;
    
    let context = test_context("gitignore-test");
    mgr.extract_template("basic", &project_dir, &context)?;
    
    assert!(project_dir.join(".gitignore").exists(), ".gitignore should exist");
    assert!(!project_dir.join(".gitignore.template").exists(), ".gitignore.template should NOT exist");
    
    Ok(())
}

/// Test that template extraction doesn't fail with unusual project names
#[test]
fn test_unusual_project_names() -> Result<()> {
    let mgr = TemplateManager::new()?;
    
    let test_names = vec![
        "robot-2024",
        "team_1234",
        "FTC_Bot",
        "my-awesome-bot",
    ];
    
    for name in test_names {
        let temp_dir = TempDir::new()?;
        let project_dir = temp_dir.path().join(name);
        fs::create_dir(&project_dir)?;
        
        let context = test_context(name);
        let result = mgr.extract_template("basic", &project_dir, &context);
        
        assert!(result.is_ok(), "Should handle project name: {}", name);
        assert!(project_dir.join("README.md").exists(), "README should exist for {}", name);
    }
    
    Ok(())
}