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use fmt::Display;
use std::fmt;

/// Represents the different methods to create a `DynamicLibrary`.

#[derive(Debug, Clone)]
pub enum DynamicLibraryCreationMode {
    /// Creates a dynamic library representing the running executable.

    Executable,
    /// Loads a dynamic library file with local visibility.

    Open(String),
    /// Creates a dynamic library holding all global symbols.

    Process,
}

impl DynamicLibraryCreationMode {
    /// a suger method for [`DynamicLibraryCreationMode::Open`]

    pub fn open(path: impl Into<String>) -> Self { Self::Open(path.into()) }
}

/// Configures how a `DynamicLibrary` should be created on a platform.

///

/// The different constructors represents the different constructors modes of

/// `DynamicLibrary`. See [`DynamicLibraryCreationMode`] for more information.

#[derive(Debug, Clone)]
pub struct DynamicLibraryPlatformConfig {
    creation_mode: DynamicLibraryCreationMode,
}

impl DynamicLibraryPlatformConfig {
    /// Create [`DynamicLibraryPlatformConfig`] using the provided

    /// [`DynamicLibraryCreationMode`]

    pub const fn new(mode: DynamicLibraryCreationMode) -> Self {
        Self {
            creation_mode: mode,
        }
    }
}

impl From<DynamicLibraryCreationMode> for Option<DynamicLibraryPlatformConfig> {
    fn from(mode: DynamicLibraryCreationMode) -> Self {
        Some(DynamicLibraryPlatformConfig::new(mode))
    }
}

impl Display for DynamicLibraryPlatformConfig {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self.creation_mode {
            DynamicLibraryCreationMode::Executable => {
                write!(f, "DynamicLibrary.executable()")
            },
            DynamicLibraryCreationMode::Open(ref path) => {
                write!(f, "DynamicLibrary.open('{}')", path)
            },
            DynamicLibraryCreationMode::Process => {
                write!(f, "DynamicLibrary.process()")
            },
        }
    }
}

/// Defines, how the dynamic library should be loaded on each of dart's known

/// platforms.

#[derive(Debug, Clone, Default)]
pub struct DynamicLibraryConfig {
    /// how to load the dynamic library when the operating system is a version

    /// of `Android`.

    pub android: Option<DynamicLibraryPlatformConfig>,
    /// how to load the dynamic library when the operating system is a version

    /// `Fuchsia`.

    pub fuchsia: Option<DynamicLibraryPlatformConfig>,
    /// how to load the dynamic library when the operating system is a version

    /// `iOS`.

    pub ios: Option<DynamicLibraryPlatformConfig>,
    /// how to load the dynamic library when the operating system is a version

    /// `Linux`.

    pub linux: Option<DynamicLibraryPlatformConfig>,
    /// how to load the dynamic library when the operating system is a version

    /// `macOS`.

    pub macos: Option<DynamicLibraryPlatformConfig>,
    /// how to load the dynamic library when the operating system is a version

    /// `Windows`.

    pub windows: Option<DynamicLibraryPlatformConfig>,
}