import Carbon.HIToolbox
import Foundation
import Testing
@testable import ShotdeckCore

@Test("GEO-1 primary-only 1080-tall screen, AppKit rect (100,100,400,300)")
func geo1_primaryOnlyAppKitRectConvertsToExpectedCGRect() {
    let region = CaptureRegion.fromAppKit(
        rect: CGRect(x: 100, y: 100, width: 400, height: 300),
        displayID: 1,
        capturedScale: 2,
        primaryHeight: 1080
    )
    #expect(region.rect == CGRect(x: 100, y: 680, width: 400, height: 300))
}

@Test("GEO-2 rect flush to AppKit bottom (y=0), h=300, primaryHeight=1080")
func geo2_flushToAppKitBottomYieldsCGY780() {
    let region = CaptureRegion.fromAppKit(
        rect: CGRect(x: 50, y: 0, width: 200, height: 300),
        displayID: 1,
        capturedScale: 1,
        primaryHeight: 1080
    )
    #expect(region.rect.origin.y == 780)
}

@Test("GEO-3 rect flush to AppKit top (y+h=primaryHeight), primaryHeight=1080, h=300")
func geo3_flushToAppKitTopYieldsCGY0() {
    let region = CaptureRegion.fromAppKit(
        rect: CGRect(x: 50, y: 780, width: 200, height: 300),
        displayID: 1,
        capturedScale: 1,
        primaryHeight: 1080
    )
    #expect(region.rect.origin.y == 0)
}

@Test("GEO-4 round-trip AppKit→CG via injectable overload, then invert recovers original")
func geo4_invertRecoverOriginalAppKitRect() {
    let original = CGRect(x: 100, y: 100, width: 400, height: 300)
    let primaryHeight: CGFloat = 1080
    let region = CaptureRegion.fromAppKit(
        rect: original,
        displayID: 1,
        capturedScale: 2,
        primaryHeight: primaryHeight
    )
    let appKitY = primaryHeight - region.rect.origin.y - region.rect.height
    let recovered = CGRect(
        x: region.rect.origin.x,
        y: appKitY,
        width: region.rect.width,
        height: region.rect.height
    )
    #expect(recovered == original)
}

@Test("GEO-5 isStillValid for displayID 999_999 is false and does not trap")
func geo5_unknownDisplayIsNotStillValid() {
    let region = CaptureRegion(
        displayID: 999_999,
        rect: CGRect(x: 0, y: 0, width: 100, height: 100),
        capturedScale: 1
    )
    #expect(region.isStillValid == false)
}

@Test("GEO-6 CaptureRegion JSONEncoder→JSONDecoder round-trip equals original")
func geo6_codableRoundTripEqualsOriginal() throws {
    let original = CaptureRegion(
        displayID: 42,
        rect: CGRect(x: 10, y: 20, width: 300, height: 400),
        capturedScale: 2
    )
    let data = try JSONEncoder().encode(original)
    let decoded = try JSONDecoder().decode(CaptureRegion.self, from: data)
    #expect(decoded == original)
}

@Test("GEO-7 secondary screen negative x: AppKit (−1800,200,500,400) → CG (−1800,480,500,400)")
func geo7_secondaryNegativeXLeavesXUnchanged() {
    // Secondary AppKit frame (−1920, 0, 1920, 1080); primaryHeight=1080.
    let region = CaptureRegion.fromAppKit(
        rect: CGRect(x: -1800, y: 200, width: 500, height: 400),
        displayID: 2,
        capturedScale: 1,
        primaryHeight: 1080
    )
    #expect(region.rect == CGRect(x: -1800, y: 480, width: 500, height: 400))
}

@Test("GEO-8 secondary screen stacked above primary: AppKit (300,1300,600,350) → CG (300,−570,600,350)")
func geo8_secondaryPositiveYProducesNegativeCGY() {
    // Secondary AppKit frame (0, 1080, 1920, 1080); primaryHeight=1080.
    let region = CaptureRegion.fromAppKit(
        rect: CGRect(x: 300, y: 1300, width: 600, height: 350),
        displayID: 2,
        capturedScale: 1,
        primaryHeight: 1080
    )
    #expect(region.rect == CGRect(x: 300, y: -570, width: 600, height: 350))
}

/// Carbon registrations are process-wide, so these cases must not run in parallel.
@Suite(.serialized)
@MainActor
struct HotkeyCenterCarbonTests {
    /// kVK_ANSI_2. The app registers this combo once (WP-4a); tests only exercise the registrar.
    private let captureKeyCode: UInt32 = 19
    private let captureModifiers = UInt32(optionKey) | UInt32(shiftKey)

    @Test("HK-1 register id a with Option-Shift-2 returns true")
    func hk1_registerReturnsTrue() {
        let center = HotkeyCenter()
        defer { center.unregisterAll() }
        let ok = center.register(id: "a", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        if !ok {
            Issue.record("HK-1: RegisterEventHotKey returned non-noErr inside swift test (no NSApplication). Carbon registration did not function headlessly.")
            return
        }
        #expect(ok)
    }

    @Test("HK-2 register same combo under a different id returns false")
    func hk2_duplicateComboRejected() {
        let center = HotkeyCenter()
        defer { center.unregisterAll() }
        let first = center.register(id: "a", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        if !first {
            Issue.record("HK-2: first RegisterEventHotKey failed inside swift test (no NSApplication); cannot evaluate duplicate-combo rejection.")
            return
        }
        let second = center.register(id: "b", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        #expect(second == false)
    }

    @Test("HK-3 unregister frees the combination so a later register succeeds")
    func hk3_unregisterFreesCombination() {
        let center = HotkeyCenter()
        defer { center.unregisterAll() }
        let first = center.register(id: "a", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        if !first {
            Issue.record("HK-3: first RegisterEventHotKey failed inside swift test (no NSApplication); cannot evaluate unregister.")
            return
        }
        center.unregister(id: "a")
        let again = center.register(id: "c", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        #expect(again)
    }

    @Test("HK-4 unregisterAll frees combinations so a later register succeeds")
    func hk4_unregisterAllFreesCombinations() {
        let center = HotkeyCenter()
        defer { center.unregisterAll() }
        let first = center.register(id: "a", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        let other = center.register(
            id: "other",
            keyCode: UInt32(kVK_ANSI_3),
            modifiers: captureModifiers
        ) {}
        if !first {
            Issue.record("HK-4: RegisterEventHotKey failed inside swift test (no NSApplication); cannot evaluate unregisterAll.")
            return
        }
        _ = other
        center.unregisterAll()
        let again = center.register(id: "c", keyCode: captureKeyCode, modifiers: captureModifiers) {}
        #expect(again)
    }
}