import XCTest
@testable import Ten31Transcripts

/// Channel-verified self detection: self = mic active AND louder than system, so a
/// remote speaker (in the system channel) is never mislabeled as the local user.
final class ChannelSelfVADTests: XCTestCase {
    private let win = 0.05

    func testSelfSpanWhereMicDominates() {
        // Self talks windows 0–9 (mic loud, system silent), other talks 10–19.
        let mic = Array(repeating: Float(0.15), count: 10) + Array(repeating: Float(0.0), count: 10)
        let sys = Array(repeating: Float(0.0), count: 10) + Array(repeating: Float(0.15), count: 10)
        let spans = ChannelSelfVAD.selfSpans(micRMS: mic, systemRMS: sys, windowSec: win)
        XCTAssertEqual(spans.count, 1)
        XCTAssertEqual(spans.first?.start ?? -1, 0.0, accuracy: 0.001)
        XCTAssertEqual(spans.first?.end ?? -1, 0.5, accuracy: win + 0.001)   // ~windows 0–9
    }

    func testRemoteEchoIntoMicIsNotSelf() {
        // Remote person loud in system, only faintly echoed into mic (below margin).
        let mic = Array(repeating: Float(0.02), count: 20)
        let sys = Array(repeating: Float(0.15), count: 20)
        XCTAssertTrue(ChannelSelfVAD.selfSpans(micRMS: mic, systemRMS: sys, windowSec: win).isEmpty)
    }

    func testSilenceProducesNoSpans() {
        let q = Array(repeating: Float(0.003), count: 20)
        XCTAssertTrue(ChannelSelfVAD.selfSpans(micRMS: q, systemRMS: q, windowSec: win).isEmpty)
    }

    func testShortBlipDropped() {
        // 2 active windows < minWindows(3) → ignored.
        let mic: [Float] = [0.2, 0.2] + Array(repeating: Float(0.0), count: 18)
        let sys = Array(repeating: Float(0.0), count: 20)
        XCTAssertTrue(ChannelSelfVAD.selfSpans(micRMS: mic, systemRMS: sys, windowSec: win).isEmpty)
    }

    func testHangoverBridgesShortGap() {
        // Brief dip (2 windows) inside a self turn stays ONE span, not two.
        let mic = Array(repeating: Float(0.2), count: 8) + [0.0, 0.0] + Array(repeating: Float(0.2), count: 8)
        let sys = Array(repeating: Float(0.0), count: 18)
        let spans = ChannelSelfVAD.selfSpans(micRMS: mic, systemRMS: sys, windowSec: win)
        XCTAssertEqual(spans.count, 1)
    }
}