import Foundation

/// Optional external helpers. Konverter works without them — they only widen
/// the conversion matrix (formats Apple's frameworks cannot write) and are
/// detected once at launch.
enum Toolchain {
    private static let homebrewPaths = ["/opt/homebrew/bin", "/usr/local/bin"]

    /// ffmpeg/ffprobe: MKV, WebM, AVI, WMV, MP3, FLAC, OGG, Opus, WMA.
    static let ffmpeg: String? = Shell.find("ffmpeg", extraPaths: homebrewPaths)
    static let ffprobe: String? = Shell.find("ffprobe", extraPaths: homebrewPaths)

    /// LibreOffice: PPT/PPTX rendering, XLS/XLSX/ODS, PAGES, Keynote.
    static let soffice: String? = {
        let candidates = [
            "/Applications/LibreOffice.app/Contents/MacOS/soffice",
            "/Applications/LibreOffice.app/Contents/MacOS/soffice.bin"
        ]
        for candidate in candidates where FileManager.default.isExecutableFile(atPath: candidate) {
            return candidate
        }
        return Shell.find("soffice", extraPaths: homebrewPaths)
    }()

    static var hasFFmpeg: Bool { ffmpeg != nil }
    static var hasLibreOffice: Bool { soffice != nil }

    /// `curl`-free, sandbox-free best-effort image rasteriser for SVG and other
    /// formats ImageIO refuses to decode but Quick Look understands.
    static let qlmanage: String? = Shell.find("qlmanage", extraPaths: ["/usr/bin"])

    static let ditto = "/usr/bin/ditto"
    static let tar = "/usr/bin/tar"
    static let gzip = "/usr/bin/gzip"
    static let gunzip = "/usr/bin/gunzip"
    static let textutil = "/usr/bin/textutil"
    static let afconvert = "/usr/bin/afconvert"
    static let zip = "/usr/bin/zip"
    static let unzip = "/usr/bin/unzip"

    /// Human readable summary for the About/Settings pane.
    static var summary: String {
        var parts: [String] = ["Core (ImageIO, PDFKit, AVFoundation)"]
        if hasFFmpeg { parts.append("ffmpeg") }
        if hasLibreOffice { parts.append("LibreOffice") }
        return parts.joined(separator: " · ")
    }

    static var missingToolAdvice: String? {
        var advice: [String] = []
        if !hasFFmpeg { advice.append("brew install ffmpeg") }
        if !hasLibreOffice { advice.append("brew install --cask libreoffice") }
        return advice.isEmpty ? nil : advice.joined(separator: "  ·  ")
    }
}