cargo-rail 0.32.0

//! Version bumping and Cargo.toml manipulation

use crate::config::Pre1BreakingBump;
use crate::error::{RailError, RailResult};
use semver::Version;
use serde::{Deserialize, Serialize};
use std::path::Path;
use std::str::FromStr;

/// Version bump strategy
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum BumpType {
    /// Increment patch version (0.0.Z or X.Y.z)
    Patch,
    /// Increment minor version (0.Y.0 or X.y.0)
    Minor,
    /// Increment major version (X.0.0 or 0.Y.0 for 0.x)
    Major,
    /// Increment prerelease version (1.0.0-rc.1 -> 1.0.0-rc.2)
    /// If no prerelease exists, adds -rc.1
    Prerelease,
    /// Strip prerelease suffix (1.0.0-rc.2 -> 1.0.0)
    /// If no prerelease exists, this is a no-op
    Release,
    /// Set exact version
    Exact(Version),
}

impl FromStr for BumpType {
    type Err = RailError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().as_str() {
            "major" => Ok(Self::Major),
            "minor" => Ok(Self::Minor),
            "patch" => Ok(Self::Patch),
            "prerelease" | "pre" | "rc" => Ok(Self::Prerelease),
            "release" => Ok(Self::Release),
            _ => {
                // Try parsing as explicit version
                let version = Version::parse(s).map_err(|e| {
          RailError::with_help(
            format!("Invalid version bump: {}", s),
            format!(
              "Use 'major', 'minor', 'patch', 'prerelease', 'release', or a valid semver version (e.g., '1.2.3'). Parse error: {}",
              e
            ),
          )
        })?;
                Ok(Self::Exact(version))
            }
        }
    }
}

impl BumpType {
    /// Apply bump to a version
    pub fn apply(&self, current: &Version) -> Version {
        match self {
            Self::Patch => {
                let mut next = current.clone();
                next.patch += 1;
                next.pre = semver::Prerelease::EMPTY;
                next.build = semver::BuildMetadata::EMPTY;
                next
            }
            Self::Minor => {
                let mut next = current.clone();
                next.minor += 1;
                next.patch = 0;
                next.pre = semver::Prerelease::EMPTY;
                next.build = semver::BuildMetadata::EMPTY;
                next
            }
            Self::Major => {
                let mut next = current.clone();
                // Always bump major version - including 0.x -> 1.0.0
                // Users who want semver-compatible "breaking change" on 0.x can use --bump minor
                next.major += 1;
                next.minor = 0;
                next.patch = 0;
                next.pre = semver::Prerelease::EMPTY;
                next.build = semver::BuildMetadata::EMPTY;
                next
            }
            Self::Prerelease => {
                let mut next = current.clone();
                next.build = semver::BuildMetadata::EMPTY;

                if current.pre.is_empty() {
                    // No prerelease - add rc.1 ("rc.1" is always valid per semver spec)
                    next.pre = semver::Prerelease::new("rc.1").unwrap_or(semver::Prerelease::EMPTY);
                } else {
                    // Increment the numeric part of the prerelease
                    // Supports: rc.1 -> rc.2, alpha.3 -> alpha.4, beta.0 -> beta.1
                    let pre_str = current.pre.as_str();
                    if let Some((prefix, num_str)) = pre_str.rsplit_once('.') {
                        if let Ok(num) = num_str.parse::<u64>() {
                            let new_pre = format!("{}.{}", prefix, num + 1);
                            next.pre = semver::Prerelease::new(&new_pre).unwrap_or_else(|_| current.pre.clone());
                        } else {
                            // Not a number suffix, append .1
                            let new_pre = format!("{}.1", pre_str);
                            next.pre = semver::Prerelease::new(&new_pre).unwrap_or_else(|_| current.pre.clone());
                        }
                    } else {
                        // No dot in prerelease (e.g., "alpha"), append .1
                        let new_pre = format!("{}.1", pre_str);
                        next.pre = semver::Prerelease::new(&new_pre).unwrap_or_else(|_| current.pre.clone());
                    }
                }
                next
            }
            Self::Release => {
                // Strip prerelease and build metadata
                let mut next = current.clone();
                next.pre = semver::Prerelease::EMPTY;
                next.build = semver::BuildMetadata::EMPTY;
                next
            }
            Self::Exact(version) => version.clone(),
        }
    }
}

/// How the user asked versions to be computed
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum BumpRequest {
    /// One bump applied to every target crate
    Explicit(BumpType),
    /// Per-crate inference from the configured release source and dependency cascades
    Auto,
}

impl FromStr for BumpRequest {
    type Err = RailError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        if s.eq_ignore_ascii_case("auto") {
            Ok(Self::Auto)
        } else {
            s.parse::<BumpType>().map(Self::Explicit)
        }
    }
}

/// Semver impact level, ordered so `max()` folds commit history
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum BumpLevel {
    /// Bug fixes and performance improvements
    Patch,
    /// New features
    Minor,
    /// Breaking changes
    Major,
}

impl BumpLevel {
    /// Map a level to a concrete bump, honoring the pre-1.0 breaking policy
    pub fn to_bump_type(self, current: &Version, pre_1_breaking: Pre1BreakingBump) -> BumpType {
        match self {
            Self::Major if current.major == 0 && pre_1_breaking == Pre1BreakingBump::Minor => BumpType::Minor,
            Self::Major => BumpType::Major,
            Self::Minor => BumpType::Minor,
            Self::Patch => BumpType::Patch,
        }
    }

    /// String form used in plan output and change files
    pub fn as_str(&self) -> &'static str {
        match self {
            Self::Patch => "patch",
            Self::Minor => "minor",
            Self::Major => "major",
        }
    }
}

impl FromStr for BumpLevel {
    type Err = RailError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.to_lowercase().as_str() {
            "patch" => Ok(Self::Patch),
            "minor" => Ok(Self::Minor),
            "major" => Ok(Self::Major),
            _ => Err(RailError::with_help(
                format!("invalid bump level: {}", s),
                "use 'patch', 'minor', or 'major'",
            )),
        }
    }
}

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

/// Semver impact of one conventional commit
///
/// Fixed semantics regardless of custom changelog groups: breaking → major,
/// feat → minor, fix/perf → patch, everything else (including custom types
/// and unconventional commits) → no bump.
pub(crate) fn commit_bump_level(parsed: &crate::release::changelog::ParsedSubject<'_>) -> Option<BumpLevel> {
    if parsed.breaking {
        return Some(BumpLevel::Major);
    }
    match parsed.commit_type? {
        "feat" => Some(BumpLevel::Minor),
        "fix" | "perf" => Some(BumpLevel::Patch),
        _ => None,
    }
}

/// Version bumper for Cargo.toml files
#[derive(Debug)]
pub struct VersionBumper;

impl VersionBumper {
    /// Bump version in Cargo.toml
    ///
    /// Uses lossless TOML editing to preserve comments and formatting.
    ///
    /// # Errors
    /// Fails when the crate uses workspace version inheritance.
    pub fn bump_version(manifest_path: &Path, bump_type: BumpType) -> RailResult<Version> {
        use crate::toml::editor::TomlEditor;

        let mut editor = TomlEditor::open(manifest_path)?;
        let doc = editor.doc();

        // Get current version - check for workspace inheritance
        let version_item = doc.get("package").and_then(|p| p.get("version"));

        // Check if using workspace inheritance
        if let Some(item) = version_item
            && (item.is_inline_table() || item.is_table())
        {
            // Check for { workspace = true }
            if let Some(tbl) = item.as_inline_table() {
                if tbl.get("workspace").and_then(|v| v.as_bool()) == Some(true) {
                    return Err(RailError::with_help(
                        format!(
                            "cannot bump version in {}: uses workspace inheritance",
                            manifest_path.display()
                        ),
                        "Set a specific version in this crate's Cargo.toml, or update [workspace.package.version] in the root Cargo.toml",
                    ));
                }
            } else if let Some(tbl) = item.as_table()
                && tbl.get("workspace").and_then(|v| v.as_bool()) == Some(true)
            {
                return Err(RailError::with_help(
                    format!(
                        "cannot bump version in {}: uses workspace inheritance",
                        manifest_path.display()
                    ),
                    "Set a specific version in this crate's Cargo.toml, or update [workspace.package.version] in the root Cargo.toml",
                ));
            }
        }

        let current_str = version_item.and_then(|v| v.as_str()).ok_or_else(|| {
            RailError::with_help(
                format!("No version field in {}", manifest_path.display()),
                "Ensure [package.version] is set",
            )
        })?;

        let current = Version::parse(current_str).map_err(|e| {
            RailError::message(format!(
                "Invalid version '{}' in {}: {}",
                current_str,
                manifest_path.display(),
                e
            ))
        })?;

        // Calculate new version
        let new_version = bump_type.apply(&current);

        // Update in document
        editor.set("package.version", new_version.to_string())?;

        // Write back (atomic write handled by editor)
        editor.write()?;

        Ok(new_version)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_bump_patch() {
        let v = Version::parse("1.2.3").unwrap();
        let next = BumpType::Patch.apply(&v);
        assert_eq!(next, Version::parse("1.2.4").unwrap());
    }

    #[test]
    fn test_bump_minor() {
        let v = Version::parse("1.2.3").unwrap();
        let next = BumpType::Minor.apply(&v);
        assert_eq!(next, Version::parse("1.3.0").unwrap());
    }

    #[test]
    fn test_bump_major() {
        let v = Version::parse("1.2.3").unwrap();
        let next = BumpType::Major.apply(&v);
        assert_eq!(next, Version::parse("2.0.0").unwrap());
    }

    #[test]
    fn test_bump_major_pre_1() {
        // For 0.x versions, major bump goes to 1.0.0
        let v = Version::parse("0.2.3").unwrap();
        let next = BumpType::Major.apply(&v);
        assert_eq!(next, Version::parse("1.0.0").unwrap());
    }

    #[test]
    fn test_bump_strips_prerelease() {
        let v = Version::parse("1.2.3-beta.1").unwrap();
        let next = BumpType::Patch.apply(&v);
        assert_eq!(next, Version::parse("1.2.4").unwrap());
    }

    #[test]
    fn test_bump_prerelease_from_stable() {
        // Stable version gets rc.1 added
        let v = Version::parse("1.0.0").unwrap();
        let next = BumpType::Prerelease.apply(&v);
        assert_eq!(next, Version::parse("1.0.0-rc.1").unwrap());
    }

    #[test]
    fn test_bump_prerelease_increment_rc() {
        // rc.1 -> rc.2
        let v = Version::parse("1.0.0-rc.1").unwrap();
        let next = BumpType::Prerelease.apply(&v);
        assert_eq!(next, Version::parse("1.0.0-rc.2").unwrap());
    }

    #[test]
    fn test_bump_prerelease_increment_alpha() {
        // alpha.3 -> alpha.4
        let v = Version::parse("2.0.0-alpha.3").unwrap();
        let next = BumpType::Prerelease.apply(&v);
        assert_eq!(next, Version::parse("2.0.0-alpha.4").unwrap());
    }

    #[test]
    fn test_bump_prerelease_increment_beta() {
        // beta.0 -> beta.1
        let v = Version::parse("1.5.0-beta.0").unwrap();
        let next = BumpType::Prerelease.apply(&v);
        assert_eq!(next, Version::parse("1.5.0-beta.1").unwrap());
    }

    #[test]
    fn test_bump_release_strips_prerelease() {
        // rc.2 -> stable
        let v = Version::parse("1.0.0-rc.2").unwrap();
        let next = BumpType::Release.apply(&v);
        assert_eq!(next, Version::parse("1.0.0").unwrap());
    }

    #[test]
    fn test_bump_release_noop_on_stable() {
        // Stable version stays stable
        let v = Version::parse("1.0.0").unwrap();
        let next = BumpType::Release.apply(&v);
        assert_eq!(next, Version::parse("1.0.0").unwrap());
    }

    #[test]
    fn test_parse_bump_prerelease() {
        assert_eq!(BumpType::from_str("prerelease").unwrap(), BumpType::Prerelease);
        assert_eq!(BumpType::from_str("pre").unwrap(), BumpType::Prerelease);
        assert_eq!(BumpType::from_str("rc").unwrap(), BumpType::Prerelease);
        assert_eq!(BumpType::from_str("PRERELEASE").unwrap(), BumpType::Prerelease);
    }

    #[test]
    fn test_parse_bump_release() {
        assert_eq!(BumpType::from_str("release").unwrap(), BumpType::Release);
        assert_eq!(BumpType::from_str("RELEASE").unwrap(), BumpType::Release);
    }
}