use tempfile::TempDir;
use std::fs;
use std::path::Path;

use anvil::templates::{TemplateManager, TemplateContext};
use anvil::project::config::ProjectConfig;

// ============================================================================
// Template extraction tests
// ============================================================================

#[test]
fn test_basic_template_extracts_all_expected_files() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "test_proj".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    let count = TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();
    assert!(count >= 10, "Expected at least 10 files, got {}", count);
}

#[test]
fn test_template_creates_sketch_directory() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "blink".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let sketch_dir = tmp.path().join("blink");
    assert!(sketch_dir.is_dir(), "Sketch directory should exist");

    let ino_file = sketch_dir.join("blink.ino");
    assert!(ino_file.exists(), "Sketch .ino file should exist");

    // Verify the .ino content has correct includes
    let content = fs::read_to_string(&ino_file).unwrap();
    assert!(
        content.contains("blink_app.h"),
        ".ino should include project-specific app header"
    );
    assert!(
        content.contains("hal_arduino.h"),
        ".ino should include hal_arduino.h"
    );
}

#[test]
fn test_template_creates_hal_files() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "sensor".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    assert!(
        tmp.path().join("lib/hal/hal.h").exists(),
        "hal.h should exist"
    );
    assert!(
        tmp.path().join("lib/hal/hal_arduino.h").exists(),
        "hal_arduino.h should exist"
    );

    // Verify hal.h defines the abstract Hal class
    let hal_content = fs::read_to_string(tmp.path().join("lib/hal/hal.h")).unwrap();
    assert!(
        hal_content.contains("class Hal"),
        "hal.h should define class Hal"
    );
    assert!(
        hal_content.contains("virtual void pinMode"),
        "hal.h should declare pinMode"
    );
}

#[test]
fn test_template_creates_app_header() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "my_sensor".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let app_path = tmp.path().join("lib/app/my_sensor_app.h");
    assert!(app_path.exists(), "App header should exist with project name");

    let content = fs::read_to_string(&app_path).unwrap();
    assert!(
        content.contains("#include <hal.h>"),
        "App header should include hal.h"
    );
    assert!(
        content.contains("class BlinkApp"),
        "App header should define BlinkApp class"
    );
}

#[test]
fn test_template_creates_test_infrastructure() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "blink".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    assert!(
        tmp.path().join("test/CMakeLists.txt").exists(),
        "CMakeLists.txt should exist"
    );
    assert!(
        tmp.path().join("test/test_unit.cpp").exists(),
        "test_unit.cpp should exist"
    );
    assert!(
        tmp.path().join("test/mocks/mock_hal.h").exists(),
        "mock_hal.h should exist"
    );
    assert!(
        tmp.path().join("test/mocks/sim_hal.h").exists(),
        "sim_hal.h should exist"
    );
    assert!(
        tmp.path().join("test/run_tests.sh").exists(),
        "run_tests.sh should exist"
    );
    assert!(
        tmp.path().join("test/run_tests.bat").exists(),
        "run_tests.bat should exist"
    );
}

#[test]
fn test_template_test_file_references_correct_app() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "motor_ctrl".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let test_content = fs::read_to_string(
        tmp.path().join("test/test_unit.cpp")
    ).unwrap();
    assert!(
        test_content.contains("motor_ctrl_app.h"),
        "Test file should include project-specific app header"
    );
}

#[test]
fn test_template_cmake_references_correct_project() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "my_bot".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let cmake = fs::read_to_string(
        tmp.path().join("test/CMakeLists.txt")
    ).unwrap();
    assert!(
        cmake.contains("my_bot"),
        "CMakeLists.txt should contain project name"
    );
}

#[test]
fn test_template_creates_dot_files() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "blink".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    assert!(
        tmp.path().join(".gitignore").exists(),
        ".gitignore should be created from _dot_ prefix"
    );
    assert!(
        tmp.path().join(".editorconfig").exists(),
        ".editorconfig should be created"
    );
    assert!(
        tmp.path().join(".clang-format").exists(),
        ".clang-format should be created"
    );
    assert!(
        tmp.path().join(".vscode/settings.json").exists(),
        ".vscode/settings.json should be created"
    );
}

#[test]
fn test_template_creates_readme() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "blink".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let readme = tmp.path().join("README.md");
    assert!(readme.exists(), "README.md should exist");

    let content = fs::read_to_string(&readme).unwrap();
    assert!(content.contains("blink"), "README should contain project name");
}

// ============================================================================
// .anvil.toml config tests
// ============================================================================

#[test]
fn test_template_creates_valid_config() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "blink".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Should be loadable by ProjectConfig
    let config = ProjectConfig::load(tmp.path()).unwrap();
    assert_eq!(config.project.name, "blink");
    assert_eq!(config.build.fqbn, "arduino:avr:uno");
    assert_eq!(config.monitor.baud, 115200);
    assert!(config.build.extra_flags.contains(&"-Werror".to_string()));
}

#[test]
fn test_config_roundtrip() {
    let tmp = TempDir::new().unwrap();
    let config = ProjectConfig::new("roundtrip_test");
    config.save(tmp.path()).unwrap();

    let loaded = ProjectConfig::load(tmp.path()).unwrap();
    assert_eq!(loaded.project.name, "roundtrip_test");
    assert_eq!(loaded.build.fqbn, config.build.fqbn);
    assert_eq!(loaded.monitor.baud, config.monitor.baud);
    assert_eq!(loaded.build.include_dirs, config.build.include_dirs);
}

#[test]
fn test_config_find_project_root_walks_up() {
    let tmp = TempDir::new().unwrap();
    let config = ProjectConfig::new("walk_test");
    config.save(tmp.path()).unwrap();

    // Create nested subdirectory
    let deep = tmp.path().join("sketch").join("src").join("deep");
    fs::create_dir_all(&deep).unwrap();

    let found = ProjectConfig::find_project_root(&deep).unwrap();
    assert_eq!(found, tmp.path().canonicalize().unwrap());
}

#[test]
fn test_config_resolve_include_flags() {
    let tmp = TempDir::new().unwrap();
    fs::create_dir_all(tmp.path().join("lib/hal")).unwrap();
    fs::create_dir_all(tmp.path().join("lib/app")).unwrap();

    let config = ProjectConfig::new("flags_test");
    let flags = config.resolve_include_flags(tmp.path());

    assert_eq!(flags.len(), 2);
    assert!(flags[0].starts_with("-I"));
    assert!(flags[0].ends_with("lib/hal") || flags[0].ends_with("lib\\hal"));
}

#[test]
fn test_config_skips_nonexistent_include_dirs() {
    let tmp = TempDir::new().unwrap();
    // Don't create the directories
    let config = ProjectConfig::new("missing_dirs");
    let flags = config.resolve_include_flags(tmp.path());
    assert_eq!(flags.len(), 0, "Should skip non-existent directories");
}

// ============================================================================
// Full project creation test (end-to-end in temp dir)
// ============================================================================

#[test]
fn test_full_project_structure() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "full_test".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Verify the complete expected file tree
    let expected_files = vec![
        ".anvil.toml",
        ".gitignore",
        ".editorconfig",
        ".clang-format",
        ".vscode/settings.json",
        "README.md",
        "full_test/full_test.ino",
        "lib/hal/hal.h",
        "lib/hal/hal_arduino.h",
        "lib/app/full_test_app.h",
        "test/CMakeLists.txt",
        "test/test_unit.cpp",
        "test/run_tests.sh",
        "test/run_tests.bat",
        "test/mocks/mock_hal.h",
        "test/mocks/sim_hal.h",
    ];

    for f in &expected_files {
        let p = tmp.path().join(f);
        assert!(
            p.exists(),
            "Expected file missing: {} (checked {})",
            f,
            p.display()
        );
    }
}

#[test]
fn test_no_unicode_in_template_output() {
    // Eric's rule: only ASCII characters
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "ascii_test".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Check all generated text files for non-ASCII
    check_ascii_recursive(tmp.path());
}

fn check_ascii_recursive(dir: &Path) {
    for entry in fs::read_dir(dir).unwrap() {
        let entry = entry.unwrap();
        let path = entry.path();
        if path.is_dir() {
            check_ascii_recursive(&path);
        } else {
            // Only check text files
            let ext = path.extension().and_then(|e| e.to_str()).unwrap_or("");
            if matches!(ext, "h" | "cpp" | "ino" | "txt" | "sh" | "bat" | "json" | "toml" | "md") {
                let content = fs::read_to_string(&path).unwrap();
                for (line_num, line) in content.lines().enumerate() {
                    for (col, ch) in line.chars().enumerate() {
                        assert!(
                            ch.is_ascii(),
                            "Non-ASCII character '{}' (U+{:04X}) at {}:{}:{} ",
                            ch,
                            ch as u32,
                            path.display(),
                            line_num + 1,
                            col + 1
                        );
                    }
                }
            }
        }
    }
}

// ============================================================================
// Error case tests
// ============================================================================

#[test]
fn test_unknown_template_fails() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "test".to_string(),
        anvil_version: "1.0.0".to_string(),
    };

    let result = TemplateManager::extract("nonexistent", tmp.path(), &ctx);
    assert!(result.is_err());
}

#[test]
fn test_load_config_from_nonproject_fails() {
    let tmp = TempDir::new().unwrap();
    let result = ProjectConfig::load(tmp.path());
    assert!(result.is_err());
}