#if os(macOS)
import AppKit
import XCTest
@testable import DocsKit

final class DocumentTypographyTests: XCTestCase {
    // Synthetic fixture also measured in WebKit at 96 CSS px/in with the same
    // bundled Liberation fonts and the production [docs-text] CSS rules.
    @MainActor func testBrowserFixtureLineBreaks() throws {
        let heading = "A shared document with consistent typography on every screen"
        let bold = "This is a synthetic layout fixture for the native and browser editors. The same bundled font, page width and paragraph styles must produce the same line breaks, including a long sentence that wraps across several lines."
        let body = "The quick brown fox jumps over the lazy dog. A small change in font metrics can move the final word onto another line, so this paragraph deliberately includes enough words to exercise wrapping at a fixed document width."
        func block(_ id: String, _ text: String, heading: Bool = false, strong: Bool = false) -> CRDTNode {
            CRDTNode(id: id, type: heading ? "heading" : "paragraph", attrs: heading ? ["level": "1"] : nil, children: [CRDTNode(id: id + "t", type: "text", runs: [CRDTRun(insert: text, marks: strong ? ["strong": .object([:])] : nil)])])
        }
        let projection = CRDTProjection(children: [block("h", heading, heading: true), block("b", bold, strong: true), block("gap", ""), block("p", body)], canUndo: false, canRedo: false)
        let storage = NSTextStorage(attributedString: NativeTextProjection.render(projection))
        let manager = NSLayoutManager()
        manager.usesFontLeading = false
        let container = DocsPageTextContainer(size: CGSize(width: 636, height: 100000))
        container.geometry = DocsPageGeometry(viewportWidth: 636, paged: false)
        container.lineFragmentPadding = 0
        storage.addLayoutManager(manager); manager.addTextContainer(container)
        manager.ensureLayout(for: container)
        var lines: [String] = []
        var heights: [CGFloat] = []
        manager.enumerateLineFragments(forGlyphRange: NSRange(location: 0, length: manager.numberOfGlyphs)) { rect, _, _, range, _ in
            let chars = manager.characterRange(forGlyphRange: range, actualGlyphRange: nil)
            let line = (storage.string as NSString).substring(with: chars).trimmingCharacters(in: .whitespacesAndNewlines)
            if !line.isEmpty { lines.append(line); heights.append(rect.height) }
        }
        XCTAssertEqual(heights[2], 16.8, accuracy: 0.01)
        XCTAssertEqual(heights[3], 16.8, accuracy: 0.01)
        XCTAssertEqual(lines, Self.browserLines)
    }
    private static let browserLines: [String] = [
        "A shared document with consistent typography on",
        "every screen",
        "This is a synthetic layout fixture for the native and browser editors. The same",
        "bundled font, page width and paragraph styles must produce the same line",
        "breaks, including a long sentence that wraps across several lines.",
        "The quick brown fox jumps over the lazy dog. A small change in font metrics can move",
        "the final word onto another line, so this paragraph deliberately includes enough words to",
        "exercise wrapping at a fixed document width."
]
}
#endif