import Foundation
import CoreVideo

/// Signal Desktop adapter. Signal shows avatars/initials with a coloured ring
/// around the active speaker; names may also be available via the Electron
/// Accessibility tree (preferred over OCR when we enable it). Geometry/threshold
/// here are first-pass and will be calibrated against real Signal screenshots.
struct SignalAdapter: AppAdapter {
    static let bundleIDs = ["org.whispersystems.signal-desktop"]
    let adapterVersion = "signal-0.1.0"
    let preferredFPS = 3

    private let analyzer: GridCallAnalyzer

    init() {
        var config = GridCallAnalyzer.Config()
        // Signal's speaking cue is a 3px WHITE rounded border (not coloured); the
        // name is a bottom footer, so the tile extends up from it. Geometry tuned
        // with real fixtures. (Gotchas, per Signal source: NO border in 1:1 calls —
        // fall back to mic-VAD/audio pill — and in Speaker view the large tile is
        // the speaker; both handled at a higher level later.)
        config.nameAtBottom = true
        config.detectWhiteBorder = true
        config.detectColoredBorder = false
        config.tileExpandX = 2.4
        config.tileExpandY = 4.8
        self.analyzer = GridCallAnalyzer(config: config)
    }

    func analyze(frame: CVPixelBuffer, at t: TimeInterval) -> [SpeakerObservation] {
        analyzer.analyze(pixelBuffer: frame, at: t)
    }

    // Exposed for fixture/synthetic tests.
    func analyze(cgImage: CGImage, at t: TimeInterval) -> [SpeakerObservation] {
        analyzer.analyze(cgImage: cgImage, at: t)
    }
}