import XCTest
import CoreGraphics
@testable import Ten31Transcripts

/// Window-selection logic: prefer the exact detected window (e.g. the Meet browser
/// window) by ID, else fall back to the largest owned window. This is the fix for
/// the "captures the wrong browser window" data-flow bug.
final class VisualObserverTests: XCTestCase {

    private func c(_ id: CGWindowID, _ w: CGFloat, _ h: CGFloat) -> (id: CGWindowID, frame: CGRect) {
        (id, CGRect(x: 0, y: 0, width: w, height: h))
    }

    func testPrefersMatchingWindowIDOverLargest() {
        // The Meet window (id 42) is NOT the largest — must still be chosen by ID.
        let candidates = [c(7, 1600, 1000), c(42, 800, 600), c(9, 1200, 900)]
        let idx = VisualObserver.pickWindowIndex(candidates, preferredID: 42)
        XCTAssertEqual(idx, 1)
    }

    func testFallsBackToLargestWhenNoPreferredID() {
        let candidates = [c(7, 800, 600), c(9, 1600, 1000), c(11, 1200, 900)]
        let idx = VisualObserver.pickWindowIndex(candidates, preferredID: nil)
        XCTAssertEqual(idx, 1)   // the 1600x1000 window
    }

    func testFallsBackToLargestWhenPreferredIDMissing() {
        let candidates = [c(7, 800, 600), c(9, 1600, 1000)]
        let idx = VisualObserver.pickWindowIndex(candidates, preferredID: 999)   // gone
        XCTAssertEqual(idx, 1)
    }

    func testNilWhenNoCandidates() {
        XCTAssertNil(VisualObserver.pickWindowIndex([], preferredID: 42))
        XCTAssertNil(VisualObserver.pickWindowIndex([], preferredID: nil))
    }

    // MARK: - Duration clamping (visual_timeline.json internal consistency)

    func testClampSegmentsToDuration() {
        let segs = [
            VisualTimeline.Segment(start: 1, end: 5, name: "A", confidence: 0.9, source: "vision"),
            VisualTimeline.Segment(start: 8, end: 12, name: "B", confidence: 0.8, source: "vision"), // end past 10
            VisualTimeline.Segment(start: 10.5, end: 11, name: "C", confidence: 0.7, source: "vision"), // fully past → dropped
        ]
        let out = VisualCapture.clampSegments(segs, to: 10)
        XCTAssertEqual(out.count, 2)
        XCTAssertEqual(out[0].end, 5, accuracy: 0.001)
        XCTAssertEqual(out[1].end, 10, accuracy: 0.001)   // clamped
        XCTAssertFalse(out.contains { $0.name == "C" })   // dropped
    }

    func testClampGapsToDuration() {
        let gaps = [
            VisualTimeline.Gap(start: 2, end: 4, reason: "minimized"),
            VisualTimeline.Gap(start: 9, end: 13, reason: "minimized"),   // clamped to 10
        ]
        let out = VisualCapture.clampGaps(gaps, to: 10)
        XCTAssertEqual(out.count, 2)
        XCTAssertEqual(out[1].end, 10, accuracy: 0.001)
    }

    func testClampPassthroughWhenDurationUnknown() {
        let segs = [VisualTimeline.Segment(start: 1, end: 99, name: "A", confidence: 1, source: "vision")]
        XCTAssertEqual(VisualCapture.clampSegments(segs, to: 0), segs)   // no duration → unchanged
    }
}