import Foundation
import Testing

/// Root of the package: Tests/SstUITests/<this file> → three levels up.
private let root = URL(fileURLWithPath: #filePath)
    .deletingLastPathComponent().deletingLastPathComponent().deletingLastPathComponent()

struct TokenIntegrityTests {
    @Test func generatedSwiftMatchesTokensJSONAndContrastHolds() throws {
        #expect(
            FileManager.default.fileExists(atPath: root.appending(path: "Sources/SstUI/DesignTokens.swift").path),
            "Sources/SstUI/DesignTokens.swift ontbreekt: run `python3 Design/build_tokens.py`.")
        let process = Process()
        process.executableURL = URL(fileURLWithPath: "/usr/bin/env")
        process.arguments = ["python3", "Design/build_tokens.py", "--check"]
        process.currentDirectoryURL = root
        let pipe = Pipe()
        process.standardOutput = pipe
        process.standardError = pipe
        try process.run()
        process.waitUntilExit()
        let output = String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8) ?? ""
        #expect(process.terminationStatus == 0, "Run `python3 Design/build_tokens.py`.\n\(output.suffix(600))")
    }

    /// Views take every colour, size and time from the tokens. A line may opt out with `// token-exempt: reason`.
    @Test func viewsContainNoLooseDesignValues() throws {
        let forbidden: [(name: String, pattern: String)] = [
            ("hex colour", #"0x[0-9A-Fa-f]{6}\b"#),
            ("component colour", #"(NS)?Color\((red|white|hue):"#),
            ("literal font size", #"\.system\(size:\s*\d"#),
            ("literal corner radius", #"cornerRadius:\s*\d|\.cornerRadius\(\s*\d"#),
            ("literal padding", #"\.padding\(\s*(\.\w+\s*,\s*)?\d"#),
            ("literal frame size", #"(width|height|minWidth|minHeight|maxWidth|maxHeight|idealWidth|idealHeight):\s*[1-9]"#),
            ("literal line width", #"lineWidth:\s*\d"#),
            ("literal opacity", #"\.opacity\(\s*[0-9]"#),
        ]
        let skipped: Set<String> = ["DesignTokens.swift", "DynamicColor.swift"]
        var directories = [root.appending(path: "Sources/SstUI")]
        let app = root.appending(path: "Sources/Sst")
        if FileManager.default.fileExists(atPath: app.path) { directories.append(app) }

        var problems: [String] = []
        for directory in directories {
            let files = try FileManager.default.contentsOfDirectory(at: directory, includingPropertiesForKeys: nil)
                .filter { $0.pathExtension == "swift" && !skipped.contains($0.lastPathComponent) }
            for file in files {
                let lines = try String(contentsOf: file, encoding: .utf8).components(separatedBy: "\n")
                for (index, line) in lines.enumerated() where !line.contains("token-exempt") {
                    for rule in forbidden where line.range(of: rule.pattern, options: .regularExpression) != nil {
                        problems.append("\(file.lastPathComponent):\(index + 1) \(rule.name): \(line.trimmingCharacters(in: .whitespaces))")
                    }
                }
            }
        }
        #expect(problems.isEmpty, "Loose design values:\n\(problems.joined(separator: "\n"))")
    }
}