import Foundation
import OpenClawMLXTTSProtocol
import Testing
@testable import OpenClaw

#if arch(arm64)
@Suite(.serialized)
struct TalkMLXSpeechSynthesizerTests {
    @Test
    func `reuses resident helper across utterances`() async throws {
        let transport = TestMLXTransport(mode: .audio)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60))

        let first = try await synthesizer.synthesize(
            text: "first",
            modelRepo: nil,
            language: nil,
            voicePreset: nil)
        let second = try await synthesizer.synthesize(
            text: "second",
            modelRepo: "repo-a",
            language: "en",
            voicePreset: "voice-a")

        #expect(first.starts(with: Data("RIFF".utf8)))
        #expect(second.starts(with: Data("RIFF".utf8)))
        #expect(await factory.callCount == 1)
        let requests = await transport.sent
        #expect(requests.count == 2)
        guard case let .synthesize(firstRequest) = requests[0],
              case let .synthesize(secondRequest) = requests[1]
        else {
            Issue.record("expected two synthesis requests")
            return
        }
        #expect(firstRequest.modelRepo == TalkMLXSpeechSynthesizer.defaultModelRepo)
        #expect(secondRequest.modelRepo == "repo-a")
        #expect(secondRequest.language == "en")
        #expect(secondRequest.voice == "voice-a")
    }

    @Test
    func `retries once after helper crash`() async throws {
        let crashed = TestMLXTransport(mode: .crash)
        let restarted = TestMLXTransport(mode: .audio)
        let factory = TestMLXTransportFactory([crashed, restarted])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60))

        let data = try await synthesizer.synthesize(
            text: "retry me",
            modelRepo: nil,
            language: nil,
            voicePreset: nil)

        #expect(data.starts(with: Data("RIFF".utf8)))
        #expect(await factory.callCount == 2)
        #expect(await crashed.closeCount == 1)
        #expect(await restarted.sent.count == 1)
    }

    @Test
    func `cancel uses protocol without closing helper`() async throws {
        let transport = TestMLXTransport(mode: .waitForCancel)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60))

        let synthesis = Task {
            try await synthesizer.synthesize(
                text: "cancel me",
                modelRepo: nil,
                language: nil,
                voicePreset: nil)
        }
        await transport.waitForSynthesisRequest()
        await synthesizer.cancelCurrent()

        do {
            _ = try await synthesis.value
            Issue.record("expected cancellation")
        } catch TalkMLXSpeechSynthesizer.SynthesizeError.canceled {
            #expect(await transport.closeCount == 0)
            #expect(await transport.sent.contains { request in
                if case .cancel = request { return true }
                return false
            })
        }
    }

    @Test
    func `late audio after cancel is discarded`() async throws {
        let transport = TestMLXTransport(mode: .audioAfterCancel)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60))

        let synthesis = Task {
            try await synthesizer.synthesize(
                text: "discard me",
                modelRepo: nil,
                language: nil,
                voicePreset: nil)
        }
        await transport.waitForSynthesisRequest()
        await synthesizer.cancelCurrent()

        do {
            _ = try await synthesis.value
            Issue.record("expected cancellation")
        } catch TalkMLXSpeechSynthesizer.SynthesizeError.canceled {
            #expect(await transport.closeCount == 0)
        }
    }

    @Test
    func `unresponsive cancel terminates helper without retry`() async throws {
        let transport = TestMLXTransport(mode: .ignoreCancel)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60),
            cancelGraceDuration: .milliseconds(10))

        let synthesis = Task {
            try await synthesizer.synthesize(
                text: "cancel me hard",
                modelRepo: nil,
                language: nil,
                voicePreset: nil)
        }
        await transport.waitForSynthesisRequest()
        await synthesizer.cancelCurrent()

        do {
            _ = try await synthesis.value
            Issue.record("expected cancellation")
        } catch TalkMLXSpeechSynthesizer.SynthesizeError.canceled {
            #expect(await transport.closeCount == 1)
            #expect(await factory.callCount == 1)
        }
    }

    @Test
    func `shutdown terminates unresponsive in-flight helper`() async throws {
        let transport = TestMLXTransport(mode: .ignoreCancel)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60))

        let synthesis = Task {
            try await synthesizer.synthesize(
                text: "stop during shutdown",
                modelRepo: nil,
                language: nil,
                voicePreset: nil)
        }
        await transport.waitForSynthesisRequest()
        await synthesizer.shutdown()

        do {
            _ = try await synthesis.value
            Issue.record("expected cancellation")
        } catch TalkMLXSpeechSynthesizer.SynthesizeError.canceled {
            #expect(await transport.closeCount == 1)
            #expect(await transport.sent.contains(.shutdown))
        }
    }

    @Test
    func `memory pressure during synthesis preserves fallback`() async throws {
        let transport = TestMLXTransport(mode: .ignoreCancel)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60))

        let synthesis = Task {
            try await synthesizer.synthesize(
                text: "fall back after pressure",
                modelRepo: nil,
                language: nil,
                voicePreset: nil)
        }
        await transport.waitForSynthesisRequest()
        await synthesizer.handleMemoryPressure()

        do {
            _ = try await synthesis.value
            Issue.record("expected generation failure")
        } catch TalkMLXSpeechSynthesizer.SynthesizeError.audioGenerationFailed {
            #expect(await transport.closeCount == 1)
            #expect(await transport.sent.contains(.shutdown))
        }
    }

    @Test
    func `cancel can terminate helper before ready`() async throws {
        let transport = TestMLXTransport(mode: .startupHang)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .seconds(60),
            cancelGraceDuration: .milliseconds(10))

        let synthesis = Task {
            try await synthesizer.synthesize(
                text: "never ready",
                modelRepo: nil,
                language: nil,
                voicePreset: nil)
        }
        await factory.waitForCall()
        await synthesizer.cancelCurrent()

        do {
            _ = try await synthesis.value
            Issue.record("expected cancellation")
        } catch TalkMLXSpeechSynthesizer.SynthesizeError.canceled {
            #expect(await transport.closeCount >= 1)
            #expect(await factory.callCount == 1)
        }
    }

    @Test
    func `idle timeout shuts down resident helper`() async throws {
        let transport = TestMLXTransport(mode: .audio)
        let factory = TestMLXTransportFactory([transport])
        let synthesizer = TalkMLXSpeechSynthesizer(
            transportFactory: { try await factory.make() },
            idleDuration: .milliseconds(10))

        _ = try await synthesizer.synthesize(
            text: "brief",
            modelRepo: nil,
            language: nil,
            voicePreset: nil)
        await transport.waitForShutdown()

        #expect(await transport.closeCount == 1)
    }

    @Test
    func `pcm response becomes playable WAV`() throws {
        let wav = try TalkMLXSpeechSynthesizer.makeWAV(audio: MLXTTSAudio(
            id: "one",
            sampleRate: 32000,
            pcm: Data([0x00, 0x00, 0xFF, 0x7F])))

        #expect(wav.count == 48)
        #expect(wav.prefix(4) == Data("RIFF".utf8))
        #expect(wav.subdata(in: 8..<12) == Data("WAVE".utf8))
        #expect(wav.suffix(4) == Data([0x00, 0x00, 0xFF, 0x7F]))
    }
}

private enum TestMLXTransportError: Error {
    case closed
}

private actor TestMLXTransport: MLXTTSTransport {
    enum Mode: Equatable, Sendable {
        case audio
        case audioAfterCancel
        case crash
        case ignoreCancel
        case startupHang
        case waitForCancel
    }

    let mode: Mode
    private(set) var sent: [MLXTTSRequest] = []
    private(set) var closeCount = 0
    private var events: [MLXTTSEvent] = [.ready]
    private var closed = false

    init(mode: Mode) {
        self.mode = mode
        if mode == .startupHang {
            self.events = []
        }
    }

    func send(_ request: MLXTTSRequest) {
        self.sent.append(request)
        switch request {
        case let .synthesize(synthesize):
            switch self.mode {
            case .audio:
                self.events.append(.audio(MLXTTSAudio(
                    id: synthesize.id,
                    sampleRate: 32000,
                    pcm: Data([0x00, 0x00, 0xFF, 0x7F]))))
            case .crash:
                self.closed = true
            case .audioAfterCancel, .ignoreCancel, .startupHang, .waitForCancel:
                break
            }
        case let .cancel(id):
            if self.mode == .audioAfterCancel {
                self.events.append(.audio(MLXTTSAudio(
                    id: id,
                    sampleRate: 32000,
                    pcm: Data([0x00, 0x00, 0xFF, 0x7F]))))
            } else if self.mode != .ignoreCancel, self.mode != .startupHang {
                self.events.append(.canceled(id: id))
            }
        case .shutdown:
            self.closed = true
        }
    }

    func nextEvent() async throws -> MLXTTSEvent {
        while self.events.isEmpty {
            if self.closed {
                throw TestMLXTransportError.closed
            }
            await Task.yield()
        }
        return self.events.removeFirst()
    }

    func close() {
        self.closeCount += 1
        self.closed = true
    }

    func waitForSynthesisRequest() async {
        while !self.sent.contains(where: {
            if case .synthesize = $0 { return true }
            return false
        }) {
            await Task.yield()
        }
    }

    func waitForShutdown() async {
        while !self.sent.contains(.shutdown) || self.closeCount == 0 {
            await Task.yield()
        }
    }
}

private actor TestMLXTransportFactory {
    private var transports: [TestMLXTransport]
    private(set) var callCount = 0

    init(_ transports: [TestMLXTransport]) {
        self.transports = transports
    }

    func make() throws -> any MLXTTSTransport {
        self.callCount += 1
        guard !self.transports.isEmpty else {
            throw TestMLXTransportError.closed
        }
        return self.transports.removeFirst()
    }

    func waitForCall() async {
        while self.callCount == 0 {
            await Task.yield()
        }
    }
}
#endif