winget-types 0.4.3

use core::{fmt, str::FromStr};

use thiserror::Error;

use super::VALID_FILE_EXTENSIONS;

#[derive(Clone, Copy, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "lowercase"))]
pub enum Architecture {
    X86,
    X64,
    Arm,
    Arm64,
    #[default]
    Neutral,
}

#[derive(Error, Debug, Eq, PartialEq)]
#[error("Failed to parse as valid Architecture")]
pub struct ParseArchitectureError;

const DELIMITERS: [u8; 8] = [b',', b'/', b'\\', b'.', b'_', b'-', b'(', b')'];

const ARCHITECTURES: [(&str, Architecture); 32] = [
    ("x86-64", Architecture::X64),
    ("x86_64", Architecture::X64),
    ("x64", Architecture::X64),
    ("64-bit", Architecture::X64),
    ("64bit", Architecture::X64),
    ("win64a", Architecture::Arm64),
    ("win64", Architecture::X64),
    ("winx64", Architecture::X64),
    ("ia64", Architecture::X64),
    ("amd64", Architecture::X64),
    ("x86", Architecture::X86),
    ("x32", Architecture::X86),
    ("32-bit", Architecture::X86),
    ("32bit", Architecture::X86),
    ("win32", Architecture::X86),
    ("winx86", Architecture::X86),
    ("ia32", Architecture::X86),
    ("i386", Architecture::X86),
    ("i486", Architecture::X86),
    ("i586", Architecture::X86),
    ("i686", Architecture::X86),
    ("386", Architecture::X86),
    ("486", Architecture::X86),
    ("586", Architecture::X86),
    ("686", Architecture::X86),
    ("arm64ec", Architecture::Arm64),
    ("arm64", Architecture::Arm64),
    ("aarch64", Architecture::Arm64),
    ("arm", Architecture::Arm),
    ("armv7", Architecture::Arm),
    ("aarch", Architecture::Arm),
    ("neutral", Architecture::Neutral),
];

impl Architecture {
    #[must_use]
    pub fn from_url(url: &str) -> Option<Self> {
        fn is_delimited_at(url_bytes: &[u8], start: usize, len: usize) -> bool {
            url_bytes
                .get(start - 1)
                .is_some_and(|delimiter| DELIMITERS.contains(delimiter))
                && url_bytes
                    .get(start + len)
                    .is_some_and(|delimiter| DELIMITERS.contains(delimiter))
        }

        // Ignore the casing of the URL
        let url = url.to_ascii_lowercase();

        let url_bytes = url.as_bytes();

        // Check for {delimiter}{architecture}{delimiter}
        if let Some(arch) = ARCHITECTURES
            .into_iter()
            // For each architecture name/type pair, try to find delimited matches in the URL
            .filter_map(|(name, arch)| {
                // Find all occurrences of this architecture name in the URL (from right to left)
                url.rmatch_indices(name)
                    // Find the first (rightmost) occurrence that is properly delimited
                    .find(|&(index, _)| is_delimited_at(url_bytes, index, name.len()))
                    // If found, return a tuple of (name, arch_type, index) for comparison
                    .map(|(index, _)| (name, arch, index))
            })
            // Select the best match based on position and specificity
            .max_by_key(|(name, _, index)| {
                (
                    *index,     // Primary: prefer matches found later in the URL
                    name.len(), // Secondary: prefer longer names (e.g., x86_64 over x86)
                )
            })
            // Extract just the architecture type from the winning match
            .map(|(_, arch, _)| arch)
        {
            return Some(arch);
        }

        // If the architecture has not been found, check for {architecture}.{extension}
        for extension in VALID_FILE_EXTENSIONS {
            for (arch_name, arch) in ARCHITECTURES {
                if url
                    .rfind(extension)
                    .map(|index| index - 1)
                    .filter(|&index| url_bytes.get(index) == Some(&b'.'))
                    .is_some_and(|end| url.get(end - arch_name.len()..end) == Some(arch_name))
                {
                    return Some(arch);
                }
            }
        }

        None
    }

    /// Returns `true` if the architecture is x86.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::X86.is_x86());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_x86(self) -> bool {
        matches!(self, Self::X86)
    }

    /// Returns `true` if the architecture is x64.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::X64.is_x64());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_x64(self) -> bool {
        matches!(self, Self::X64)
    }

    /// Returns `true` if the architecture is ARM.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::Arm.is_arm());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_arm(self) -> bool {
        matches!(self, Self::Arm)
    }

    /// Returns `true` if the architecture is ARM64.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::Arm64.is_arm64());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_arm64(self) -> bool {
        matches!(self, Self::Arm64)
    }

    /// Returns `true` if the architecture is neutral.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::Neutral.is_neutral());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_neutral(self) -> bool {
        matches!(self, Self::Neutral)
    }

    /// Returns `true` if the architecture is a 64-bit architecture.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::X64.is_64_bit());
    /// assert!(Architecture::Arm64.is_64_bit());
    /// assert!(!Architecture::X86.is_64_bit());
    /// assert!(!Architecture::Arm.is_64_bit());
    /// assert!(!Architecture::Neutral.is_64_bit());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_64_bit(self) -> bool {
        matches!(self, Self::X64 | Self::Arm64)
    }

    /// Returns `true` if the architecture is a 32-bit architecture.
    ///
    /// # Examples
    ///
    /// ```
    /// use winget_types::installer::Architecture;
    ///
    /// assert!(Architecture::X86.is_32_bit());
    /// assert!(Architecture::Arm.is_32_bit());
    /// assert!(!Architecture::X64.is_32_bit());
    /// assert!(!Architecture::Arm64.is_32_bit());
    /// assert!(!Architecture::Neutral.is_32_bit());
    /// ```
    #[must_use]
    #[inline]
    pub const fn is_32_bit(self) -> bool {
        matches!(self, Self::X86 | Self::Arm)
    }

    #[must_use]
    pub const fn as_str(&self) -> &'static str {
        match self {
            Self::X86 => "x86",
            Self::X64 => "x64",
            Self::Arm => "arm",
            Self::Arm64 => "arm64",
            Self::Neutral => "neutral",
        }
    }
}

impl AsRef<str> for Architecture {
    #[inline]
    fn as_ref(&self) -> &str {
        self.as_str()
    }
}

impl fmt::Display for Architecture {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.as_str().fmt(f)
    }
}

impl FromStr for Architecture {
    type Err = ParseArchitectureError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "x86" => Ok(Self::X86),
            "x64" => Ok(Self::X64),
            "arm" => Ok(Self::Arm),
            "arm64" => Ok(Self::Arm64),
            "neutral" => Ok(Self::Neutral),
            _ => Err(ParseArchitectureError),
        }
    }
}

#[cfg(test)]
mod tests {
    use alloc::format;

    use rstest::rstest;

    use super::Architecture;

    #[rstest]
    fn x64_architectures_at_end(
        #[values(
            "x86-64", "x86_64", "x64", "64-bit", "64bit", "Win64", "Winx64", "ia64", "amd64"
        )]
        architecture: &str,
    ) {
        assert_eq!(
            Architecture::from_url(&format!("https://www.example.com/file{architecture}.exe")),
            Some(Architecture::X64)
        );
    }

    #[rstest]
    fn x64_architectures_delimited(
        #[values(
            "x86-64", "x86_64", "x64", "64-bit", "64bit", "Win64", "Winx64", "ia64", "amd64"
        )]
        architecture: &str,
        #[values(',', '/', '\\', '.', '_', '-', '(', ')')] delimiter: char,
    ) {
        assert_eq!(
            Architecture::from_url(&format!(
                "https://www.example.com/file{delimiter}{architecture}{delimiter}app.exe"
            )),
            Some(Architecture::X64)
        );
    }

    #[rstest]
    fn x86_architectures_at_end(
        #[values(
            "x86", "x32", "32-bit", "32bit", "win32", "winx86", "ia32", "i386", "i486", "i586",
            "i686", "386", "486", "586", "686"
        )]
        architecture: &str,
    ) {
        assert_eq!(
            Architecture::from_url(&format!("https://www.example.com/file{architecture}.exe")),
            Some(Architecture::X86)
        );
    }

    #[rstest]
    fn x86_architectures_delimited(
        #[values(
            "x86", "x32", "32-bit", "32bit", "win32", "winx86", "ia32", "i386", "i486", "i586",
            "i686", "386", "486", "586", "686"
        )]
        architecture: &str,
        #[values(',', '/', '\\', '.', '_', '-', '(', ')')] delimiter: char,
    ) {
        assert_eq!(
            Architecture::from_url(&format!(
                "https://www.example.com/file{delimiter}{architecture}{delimiter}app.exe"
            )),
            Some(Architecture::X86)
        );
    }

    #[rstest]
    fn arm64_architectures_at_end(
        #[values("arm64ec", "arm64", "aarch64", "win64a")] architecture: &str,
    ) {
        assert_eq!(
            Architecture::from_url(&format!("https://www.example.com/file{architecture}.exe")),
            Some(Architecture::Arm64)
        );
    }

    #[rstest]
    fn arm64_architectures_delimited(
        #[values("arm64ec", "arm64", "aarch64", "win64a")] architecture: &str,
        #[values(',', '/', '\\', '.', '_', '-', '(', ')')] delimiter: char,
    ) {
        assert_eq!(
            Architecture::from_url(&format!(
                "https://www.example.com/file{delimiter}{architecture}{delimiter}app.exe"
            )),
            Some(Architecture::Arm64)
        );
    }

    #[rstest]
    fn arm_architectures_at_end(#[values("arm", "armv7", "aarch")] architecture: &str) {
        assert_eq!(
            Architecture::from_url(&format!("https://www.example.com/file{architecture}.exe")),
            Some(Architecture::Arm)
        );
    }

    #[rstest]
    fn arm_architectures_delimited(
        #[values("arm", "armv7", "aarch")] architecture: &str,
        #[values(',', '/', '\\', '.', '_', '-', '(', ')')] delimiter: char,
    ) {
        assert_eq!(
            Architecture::from_url(&format!(
                "https://www.example.com/file{delimiter}{architecture}{delimiter}app.exe"
            )),
            Some(Architecture::Arm)
        );
    }

    #[test]
    fn no_architecture() {
        assert_eq!(
            Architecture::from_url("https://www.example.com/file.exe"),
            None
        );
    }

    #[test]
    fn win32_and_arm64_in_url() {
        assert_eq!(
            Architecture::from_url(
                "https://github.com/vim/vim-win32-installer/releases/download/v9.1.1234/gvim_9.1.1234_arm64.exe"
            ),
            Some(Architecture::Arm64)
        );
    }
}