use anvil::commands;
use anvil::library;
use anvil::project::config::{
    ProjectConfig,
};
use anvil::templates::{TemplateManager, TemplateContext};
use std::fs;
use tempfile::TempDir;

// ==========================================================================
// Device Library: anvil add / remove / lib
// ==========================================================================

#[test]
fn test_library_registry_lists_tmp36() {
    let libs = library::list_available();
    assert!(!libs.is_empty(), "Should have at least one library");

    let tmp36 = libs.iter().find(|l| l.name == "tmp36");
    assert!(tmp36.is_some(), "TMP36 should be in the registry");

    let meta = tmp36.unwrap();
    assert_eq!(meta.bus, "analog");
    assert_eq!(meta.pins, vec!["data"]);
    assert_eq!(meta.interface, "tmp36.h");
    assert_eq!(meta.mock, "tmp36_mock.h");
}

#[test]
fn test_library_find_by_name() {
    assert!(library::find_library("tmp36").is_some());
    assert!(library::find_library("nonexistent_sensor").is_none());
}

#[test]
fn test_library_extract_creates_driver_directory() {
    let tmp = TempDir::new().unwrap();

    let written = library::extract_library("tmp36", tmp.path()).unwrap();
    assert!(!written.is_empty(), "Should write files");

    let driver_dir = tmp.path().join("lib/drivers/tmp36");
    assert!(driver_dir.exists(), "Driver directory should be created");

    // All four files should exist
    assert!(driver_dir.join("tmp36.h").exists(), "Interface header");
    assert!(driver_dir.join("tmp36_analog.h").exists(), "Implementation");
    assert!(driver_dir.join("tmp36_mock.h").exists(), "Mock");
    assert!(driver_dir.join("tmp36_sim.h").exists(), "Simulation");
}

#[test]
fn test_library_extract_files_content_is_valid() {
    let tmp = TempDir::new().unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();

    let driver_dir = tmp.path().join("lib/drivers/tmp36");

    // Interface should define TempSensor class
    let interface = fs::read_to_string(driver_dir.join("tmp36.h")).unwrap();
    assert!(interface.contains("class TempSensor"), "Should define TempSensor");
    assert!(interface.contains("readCelsius"), "Should declare readCelsius");
    assert!(interface.contains("readFahrenheit"), "Should declare readFahrenheit");
    assert!(interface.contains("readRaw"), "Should declare readRaw");

    // Implementation should include hal.h
    let impl_h = fs::read_to_string(driver_dir.join("tmp36_analog.h")).unwrap();
    assert!(impl_h.contains("hal.h"), "Implementation should use HAL");
    assert!(impl_h.contains("class Tmp36Analog"), "Should define Tmp36Analog");
    assert!(impl_h.contains("analogRead"), "Should use analogRead");

    // Mock should have setTemperature
    let mock_h = fs::read_to_string(driver_dir.join("tmp36_mock.h")).unwrap();
    assert!(mock_h.contains("class Tmp36Mock"), "Should define Tmp36Mock");
    assert!(mock_h.contains("setTemperature"), "Mock should have setTemperature");

    // Sim should have noise
    let sim_h = fs::read_to_string(driver_dir.join("tmp36_sim.h")).unwrap();
    assert!(sim_h.contains("class Tmp36Sim"), "Should define Tmp36Sim");
    assert!(sim_h.contains("setNoise"), "Sim should have setNoise");
}

#[test]
fn test_library_remove_cleans_up() {
    let tmp = TempDir::new().unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();

    assert!(library::is_installed_on_disk("tmp36", tmp.path()));

    library::remove_library_files("tmp36", tmp.path()).unwrap();

    assert!(!library::is_installed_on_disk("tmp36", tmp.path()));
    // drivers/ dir should also be cleaned up if empty
    assert!(!tmp.path().join("lib/drivers").exists());
}

#[test]
fn test_library_remove_preserves_other_drivers() {
    let tmp = TempDir::new().unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();

    // Fake a second driver
    let other_dir = tmp.path().join("lib/drivers/bmp280");
    fs::create_dir_all(&other_dir).unwrap();
    fs::write(other_dir.join("bmp280.h"), "// placeholder").unwrap();

    library::remove_library_files("tmp36", tmp.path()).unwrap();

    // tmp36 gone, bmp280 still there
    assert!(!library::is_installed_on_disk("tmp36", tmp.path()));
    assert!(other_dir.exists(), "Other driver should survive");
}

#[test]
fn test_library_files_are_ascii_only() {
    let tmp = TempDir::new().unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();

    let driver_dir = tmp.path().join("lib/drivers/tmp36");
    for entry in fs::read_dir(&driver_dir).unwrap() {
        let entry = entry.unwrap();
        let content = fs::read_to_string(entry.path()).unwrap();
        for (line_num, line) in content.lines().enumerate() {
            for (col, ch) in line.chars().enumerate() {
                assert!(
                    ch.is_ascii(),
                    "Non-ASCII in {} at {}:{}: U+{:04X}",
                    entry.file_name().to_string_lossy(),
                    line_num + 1, col + 1, ch as u32
                );
            }
        }
    }
}

#[test]
fn test_config_libraries_field_roundtrips() {
    let tmp = TempDir::new().unwrap();
    let mut config = ProjectConfig::new("lib_test");
    config.libraries.insert("tmp36".to_string(), "0.1.0".to_string());
    config.save(tmp.path()).unwrap();

    let loaded = ProjectConfig::load(tmp.path()).unwrap();
    assert_eq!(loaded.libraries.len(), 1);
    assert_eq!(loaded.libraries["tmp36"], "0.1.0");
}

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

    let content = fs::read_to_string(tmp.path().join(".anvil.toml")).unwrap();
    assert!(
        !content.contains("[libraries]"),
        "Empty libraries should not appear in TOML"
    );
}

#[test]
fn test_config_libraries_serialized_when_present() {
    let tmp = TempDir::new().unwrap();
    let mut config = ProjectConfig::new("has_libs");
    config.libraries.insert("tmp36".to_string(), "0.1.0".to_string());
    config.save(tmp.path()).unwrap();

    let content = fs::read_to_string(tmp.path().join(".anvil.toml")).unwrap();
    assert!(
        content.contains("[libraries]"),
        "Non-empty libraries should appear in TOML"
    );
    assert!(content.contains("tmp36"));
}

#[test]
fn test_cmake_autodiscovers_driver_directories() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "cmake_drv".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let cmake = fs::read_to_string(tmp.path().join("test/CMakeLists.txt")).unwrap();

    assert!(
        cmake.contains("drivers"),
        "CMakeLists should reference drivers directory"
    );
    assert!(
        cmake.contains("GLOB DRIVER_DIRS"),
        "CMakeLists should glob driver directories"
    );
    assert!(
        cmake.contains("include_directories(${DRIVER_DIR})"),
        "CMakeLists should add each driver to include path"
    );

    // Driver test auto-discovery
    assert!(
        cmake.contains("GLOB DRIVER_TEST_SOURCES"),
        "CMakeLists should glob driver test files"
    );
    assert!(
        cmake.contains("gtest_discover_tests(${TEST_NAME})"),
        "CMakeLists should register driver tests with CTest"
    );
}

// ==========================================================================
// Device Library: end-to-end command-level tests
// ==========================================================================

#[test]
fn test_add_library_full_flow() {
    // Simulates: anvil new mocktest && anvil add tmp36
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "e2e_add".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();
    ProjectConfig::new("e2e_add").save(tmp.path()).unwrap();

    // Pre-check: no libraries, no drivers dir
    let config_before = ProjectConfig::load(tmp.path()).unwrap();
    assert!(config_before.libraries.is_empty());
    assert!(!tmp.path().join("lib/drivers/tmp36").exists());

    // Extract library and update config (mirrors what add_library does)
    let meta = library::find_library("tmp36").unwrap();
    let written = library::extract_library("tmp36", tmp.path()).unwrap();
    assert_eq!(written.len(), 5, "Should write 5 files (4 headers + 1 test)");

    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    let driver_include = format!("lib/drivers/{}", meta.name);
    if !config.build.include_dirs.contains(&driver_include) {
        config.build.include_dirs.push(driver_include.clone());
    }
    config.libraries.insert(meta.name.clone(), meta.version.clone());
    config.save(tmp.path()).unwrap();

    // Post-check: files exist, config updated
    assert!(tmp.path().join("lib/drivers/tmp36/tmp36.h").exists());
    assert!(tmp.path().join("lib/drivers/tmp36/tmp36_analog.h").exists());
    assert!(tmp.path().join("lib/drivers/tmp36/tmp36_mock.h").exists());
    assert!(tmp.path().join("lib/drivers/tmp36/tmp36_sim.h").exists());
    assert!(tmp.path().join("test/test_tmp36.cpp").exists(), "Test file in test/");

    let config_after = ProjectConfig::load(tmp.path()).unwrap();
    assert_eq!(config_after.libraries["tmp36"], "0.1.0");
    assert!(
        config_after.build.include_dirs.contains(&driver_include),
        "include_dirs should contain driver path"
    );
}

#[test]
fn test_remove_library_full_flow() {
    // Simulates: anvil add tmp36 && anvil remove tmp36
    let tmp = TempDir::new().unwrap();
    ProjectConfig::new("e2e_rm").save(tmp.path()).unwrap();

    // Add
    let meta = library::find_library("tmp36").unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    let driver_include = format!("lib/drivers/{}", meta.name);
    config.build.include_dirs.push(driver_include.clone());
    config.libraries.insert(meta.name.clone(), meta.version.clone());
    config.save(tmp.path()).unwrap();

    // Remove
    library::remove_library_files("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.build.include_dirs.retain(|d| d != &driver_include);
    config.libraries.remove("tmp36");
    config.save(tmp.path()).unwrap();

    // Post-check: files gone, config clean
    assert!(!tmp.path().join("lib/drivers/tmp36").exists());
    assert!(!tmp.path().join("test/test_tmp36.cpp").exists(), "Test file should be removed");
    let config_final = ProjectConfig::load(tmp.path()).unwrap();
    assert!(config_final.libraries.is_empty());
    assert!(
        !config_final.build.include_dirs.contains(&driver_include),
        "include_dirs should not contain driver path after remove"
    );
}

#[test]
fn test_add_remove_readd_idempotent() {
    // Simulates: anvil add tmp36 && anvil remove tmp36 && anvil add tmp36
    let tmp = TempDir::new().unwrap();
    ProjectConfig::new("e2e_idem").save(tmp.path()).unwrap();

    let meta = library::find_library("tmp36").unwrap();
    let driver_include = format!("lib/drivers/{}", meta.name);

    // Add
    library::extract_library("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.build.include_dirs.push(driver_include.clone());
    config.libraries.insert(meta.name.clone(), meta.version.clone());
    config.save(tmp.path()).unwrap();

    // Remove
    library::remove_library_files("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.build.include_dirs.retain(|d| d != &driver_include);
    config.libraries.remove("tmp36");
    config.save(tmp.path()).unwrap();

    assert!(!tmp.path().join("lib/drivers/tmp36").exists());

    // Re-add
    library::extract_library("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.build.include_dirs.push(driver_include.clone());
    config.libraries.insert(meta.name.clone(), meta.version.clone());
    config.save(tmp.path()).unwrap();

    // Everything back to normal
    assert!(tmp.path().join("lib/drivers/tmp36/tmp36.h").exists());
    let config_final = ProjectConfig::load(tmp.path()).unwrap();
    assert_eq!(config_final.libraries["tmp36"], "0.1.0");
    assert!(config_final.build.include_dirs.contains(&driver_include));
    // No duplicate include_dirs
    let count = config_final.build.include_dirs.iter()
        .filter(|d| *d == &driver_include)
        .count();
    assert_eq!(count, 1, "Should not duplicate include dir on re-add");
}

#[test]
fn test_library_interface_compiles_against_hal() {
    // Verify the actual C++ content is structurally correct:
    // tmp36_analog.h includes hal.h, tmp36_mock.h and tmp36_sim.h are standalone
    let tmp = TempDir::new().unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();
    let driver_dir = tmp.path().join("lib/drivers/tmp36");

    let analog = fs::read_to_string(driver_dir.join("tmp36_analog.h")).unwrap();
    assert!(analog.contains("#include \"hal.h\""), "Analog impl must include hal.h");
    assert!(analog.contains("#include \"tmp36.h\""), "Analog impl must include interface");
    assert!(analog.contains("Hal*"), "Analog impl must accept Hal pointer");

    let mock = fs::read_to_string(driver_dir.join("tmp36_mock.h")).unwrap();
    assert!(!mock.contains("hal.h"), "Mock should NOT depend on hal.h");
    assert!(mock.contains("#include \"tmp36.h\""), "Mock must include interface");

    let sim = fs::read_to_string(driver_dir.join("tmp36_sim.h")).unwrap();
    assert!(!sim.contains("hal.h"), "Sim should NOT depend on hal.h");
    assert!(sim.contains("#include \"tmp36.h\""), "Sim must include interface");
}

#[test]
fn test_library_polymorphism_contract() {
    // All implementations must inherit from TempSensor
    let tmp = TempDir::new().unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();
    let driver_dir = tmp.path().join("lib/drivers/tmp36");

    let interface = fs::read_to_string(driver_dir.join("tmp36.h")).unwrap();
    assert!(interface.contains("class TempSensor"));
    assert!(interface.contains("virtual float readCelsius()"));
    assert!(interface.contains("virtual int readRaw()"));

    // Each impl must extend TempSensor
    for (file, class) in [
        ("tmp36_analog.h", "Tmp36Analog"),
        ("tmp36_mock.h", "Tmp36Mock"),
        ("tmp36_sim.h", "Tmp36Sim"),
    ] {
        let content = fs::read_to_string(driver_dir.join(file)).unwrap();
        assert!(
            content.contains(&format!("class {} : public TempSensor", class)),
            "{} should extend TempSensor",
            file
        );
        assert!(
            content.contains("readCelsius() override"),
            "{} should override readCelsius",
            file
        );
        assert!(
            content.contains("readRaw() override"),
            "{} should override readRaw",
            file
        );
    }
}

// ==========================================================================
// Device Library: UX helpers and pin integration
// ==========================================================================

#[test]
fn test_library_meta_wiring_summary() {
    let meta = library::find_library("tmp36").unwrap();
    let summary = meta.wiring_summary();
    assert!(summary.contains("analog"), "Should mention analog bus");
    assert!(summary.contains("A0"), "Should give A0 as example pin");
}

#[test]
fn test_library_meta_pin_roles() {
    let meta = library::find_library("tmp36").unwrap();
    let roles = meta.pin_roles();
    assert_eq!(roles.len(), 1);
    assert_eq!(roles[0].0, "data");
    assert_eq!(roles[0].1, "tmp36_data");
}

#[test]
fn test_library_meta_default_mode() {
    let meta = library::find_library("tmp36").unwrap();
    assert_eq!(meta.default_mode(), "analog");
}

#[test]
fn test_library_unassigned_pins_detects_missing() {
    let meta = library::find_library("tmp36").unwrap();
    let assigned: Vec<String> = vec![];
    let missing = library::unassigned_pins(&meta, &assigned);
    assert_eq!(missing, vec!["tmp36_data"], "Should flag tmp36_data as unassigned");
}

#[test]
fn test_library_unassigned_pins_detects_assigned() {
    let meta = library::find_library("tmp36").unwrap();
    let assigned = vec!["tmp36_data".to_string()];
    let missing = library::unassigned_pins(&meta, &assigned);
    assert!(missing.is_empty(), "Should detect tmp36_data as assigned");
}

#[test]
fn test_add_with_pin_creates_assignment() {
    // Simulates: anvil new test_proj && anvil add tmp36 --pin A0
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "pin_lib".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Extract library files
    let meta = library::find_library("tmp36").unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();

    // Update config like add_library does
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    let driver_include = format!("lib/drivers/{}", meta.name);
    if !config.build.include_dirs.contains(&driver_include) {
        config.build.include_dirs.push(driver_include);
    }
    config.libraries.insert(meta.name.clone(), meta.version.clone());
    config.save(tmp.path()).unwrap();

    // Simulate --pin A0 by calling assign_pin
    let assign_name = meta.pin_assignment_name(&meta.pins[0]);
    let dir_str = tmp.path().to_string_lossy().to_string();
    commands::pin::assign_pin(
        &assign_name, "A0",
        Some(meta.default_mode()),
        None,
        Some(&dir_str),
    ).unwrap();

    // Verify the assignment exists
    let config_after = ProjectConfig::load(tmp.path()).unwrap();
    let board_pins = config_after.pins.get("uno").unwrap();
    assert!(
        board_pins.assignments.contains_key("tmp36_data"),
        "Should have tmp36_data pin assignment"
    );
    let assignment = &board_pins.assignments["tmp36_data"];
    assert_eq!(assignment.mode, "analog");

    // Verify unassigned_pins now returns empty
    let assigned: Vec<String> = board_pins.assignments.keys().cloned().collect();
    let missing = library::unassigned_pins(&meta, &assigned);
    assert!(missing.is_empty(), "All library pins should be assigned after --pin");
}

#[test]
fn test_audit_with_library_missing_pin() {
    // anvil add tmp36 without --pin should leave pin unassigned
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "audit_lib".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Add library to config but no pin assignment
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.libraries.insert("tmp36".to_string(), "0.1.0".to_string());
    config.save(tmp.path()).unwrap();

    // Check that unassigned_pins detects it
    let meta = library::find_library("tmp36").unwrap();
    let board_pins = config.pins.get("uno");
    let assigned: Vec<String> = board_pins
        .map(|bp| bp.assignments.keys().cloned().collect())
        .unwrap_or_default();
    let missing = library::unassigned_pins(&meta, &assigned);
    assert_eq!(missing, vec!["tmp36_data"]);

    // The actual audit command must not crash (this was a bug:
    // audit used to early-return when no pins assigned, skipping library check)
    let dir_str = tmp.path().to_string_lossy().to_string();
    commands::pin::audit_pins(None, false, Some(&dir_str)).unwrap();
}

#[test]
fn test_audit_with_library_pin_assigned() {
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "audit_ok".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Add library + pin assignment
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.libraries.insert("tmp36".to_string(), "0.1.0".to_string());
    config.save(tmp.path()).unwrap();

    let dir_str = tmp.path().to_string_lossy().to_string();
    commands::pin::assign_pin("tmp36_data", "A0", Some("analog"), None, Some(&dir_str)).unwrap();

    // Now check data model
    let config_after = ProjectConfig::load(tmp.path()).unwrap();
    let board_pins = config_after.pins.get("uno").unwrap();
    let assigned: Vec<String> = board_pins.assignments.keys().cloned().collect();
    let meta = library::find_library("tmp36").unwrap();
    let missing = library::unassigned_pins(&meta, &assigned);
    assert!(missing.is_empty(), "Pin should be satisfied after assignment");

    // And the audit command itself should work with the pin assigned
    commands::pin::audit_pins(None, false, Some(&dir_str)).unwrap();
}

#[test]
fn test_audit_no_pins_no_libraries_does_not_crash() {
    // Baseline: no pins, no libraries -- audit should still work
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "audit_empty".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    let dir_str = tmp.path().to_string_lossy().to_string();
    commands::pin::audit_pins(None, false, Some(&dir_str)).unwrap();
}

#[test]
fn test_add_remove_pin_assignment_survives() {
    // When we remove a library, the pin assignment should still exist
    // (the user might want to reassign it to a different library)
    let tmp = TempDir::new().unwrap();
    let ctx = TemplateContext {
        project_name: "pin_survive".to_string(),
        anvil_version: "1.0.0".to_string(),
        board_name: "uno".to_string(),
        fqbn: "arduino:avr:uno".to_string(),
        baud: 115200,
    };
    TemplateManager::extract("basic", tmp.path(), &ctx).unwrap();

    // Add library and assign pin
    let meta = library::find_library("tmp36").unwrap();
    library::extract_library("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.libraries.insert("tmp36".to_string(), "0.1.0".to_string());
    let driver_include = format!("lib/drivers/{}", meta.name);
    config.build.include_dirs.push(driver_include.clone());
    config.save(tmp.path()).unwrap();

    let dir_str = tmp.path().to_string_lossy().to_string();
    commands::pin::assign_pin("tmp36_data", "A0", Some("analog"), None, Some(&dir_str)).unwrap();

    // Remove library
    library::remove_library_files("tmp36", tmp.path()).unwrap();
    let mut config = ProjectConfig::load(tmp.path()).unwrap();
    config.build.include_dirs.retain(|d| d != &driver_include);
    config.libraries.remove("tmp36");
    config.save(tmp.path()).unwrap();

    // Pin assignment should still be there
    let config_final = ProjectConfig::load(tmp.path()).unwrap();
    let board_pins = config_final.pins.get("uno").unwrap();
    assert!(
        board_pins.assignments.contains_key("tmp36_data"),
        "Pin assignment should survive library removal"
    );
}