import SwiftUI
import DuooomiBleSDK

// MARK: - CDN Helper

private enum CDNHelper {
    static var cdnHost = "https://cdn.bowong.cc/"

    static func ensureFullUrl(_ keyOrUrl: String) -> String {
        if keyOrUrl.hasPrefix("http://") || keyOrUrl.hasPrefix("https://") {
            return keyOrUrl
        }
        let key = keyOrUrl.hasPrefix("/") ? String(keyOrUrl.dropFirst()) : keyOrUrl
        return cdnHost + key
    }

    static func isImage(_ url: String) -> Bool {
        let ext = URL(string: url)?.pathExtension.lowercased() ?? ""
        return ["jpg", "jpeg", "png", "webp", "gif"].contains(ext)
    }
}

// MARK: - View

struct WrapperTestView: View {
    @ObservedObject var viewModel: DemoViewModel

    @State private var userId = "test-user-001"
    @State private var fileUrl = "https://cdn.bowong.cc/material/569f48a8e29f47859b3a9808be37f94c.mp4"
    // Firmware
    @State private var firmwareBrand = "duomi"
    @State private var firmwareStatus = "DRAFT"
    @State private var firmwareInfo: FirmwareInfo? = nil
    @State private var firmwareLoading = false
    @State private var firmwareError: String? = nil
    // State
    @State private var isBusy = false
    @State private var connectingDeviceId: String?
    @State private var deviceFiles: [String] = []
    @State private var logs: [LogLine] = []

    struct LogLine: Identifiable {
        let id = UUID()
        let level: Level
        let message: String
        enum Level { case info, success, error }
    }

    var body: some View {
        List {
            statusSection
            scanSection
            deviceSection
            transferSection
            firmwareSection
            deviceFilesSection
            logSection
        }
        .navigationTitle("SDK Demo")
        .scrollDismissesKeyboard(.interactively)
        .onAppear {
            CDNHelper.cdnHost = viewModel.sdk.config.cdnHost
            firmwareBrand = viewModel.sdk.config.firmwareIdentifier
            firmwareStatus = viewModel.sdk.config.firmwareStatus
        }
    }

    // MARK: - Sections

    private var statusSection: some View {
        Section("Status") {
            LabeledContent("BLE", value: viewModel.btState.rawValue)
            LabeledContent("Device", value: viewModel.connectedDevice?.name ?? "—")
            LabeledContent("Version", value: viewModel.version.isEmpty ? "—" : viewModel.version)
            if viewModel.transferProgress > 0 {
                ProgressView(value: Double(viewModel.transferProgress), total: 100) {
                    Text("\(viewModel.transferProgress)%").font(.caption)
                }
            }
            if let err = viewModel.error {
                Text(err).foregroundStyle(.red).font(.caption)
            }
        }
    }

    private var scanSection: some View {
        Section("Scan & Connect") {
            HStack {
                Button("Scan") {
                    viewModel.sdk.scan()
                    log("→ scan()")
                }
                .buttonStyle(.borderedProminent)

                Button("Stop") {
                    viewModel.sdk.stopScan()
                    log("→ stopScan()")
                }
                .buttonStyle(.bordered)
            }

            ForEach(viewModel.discoveredDevices) { device in
                HStack {
                    VStack(alignment: .leading) {
                        Text(device.name ?? "Unknown")
                        Text(device.id).font(.caption2).foregroundStyle(.secondary)
                    }
                    Spacer()
                    Text("\(device.rssi) dBm").font(.caption).foregroundStyle(.secondary)

                    if viewModel.connectedDevice?.id == device.id {
                        Button("Disconnect") {
                            runDisconnect()
                        }
                        .buttonStyle(.bordered)
                        .controlSize(.small)
                        .tint(.red)
                    } else if connectingDeviceId == device.id {
                        ProgressView().controlSize(.small)
                    } else {
                        Button("Connect") {
                            runConnect(deviceId: device.id)
                        }
                        .buttonStyle(.bordered)
                        .controlSize(.small)
                        .disabled(connectingDeviceId != nil)
                    }
                }
            }
        }
    }

    private var deviceSection: some View {
        Section("Device") {
            LabeledContent("Brand", value: viewModel.deviceInfo?.brand ?? "—")
            LabeledContent("Size", value: viewModel.deviceInfo?.size ?? "—")
            LabeledContent("Power", value: viewModel.deviceInfo.map { "\($0.powerlevel)%" } ?? "—")
            LabeledContent("Storage", value: viewModel.deviceInfo.map { "\($0.freespace)/\($0.allspace)" } ?? "—")

            HStack {
                Button("getDeviceInfo") { runGetDeviceInfo() }
                Button("getVersion") { runGetVersion() }
            }
            .buttonStyle(.bordered)

            HStack {
                TextField("userId", text: $userId)
                    .textFieldStyle(.roundedBorder)
                Button("bind") { runBind() }
                    .buttonStyle(.bordered)
                Button("unbind") { runUnbind() }
                    .buttonStyle(.bordered)
            }
        }
    }

    private var transferSection: some View {
        Section("Transfer") {
            TextField("File URL (mp4/jpg/png/ani)", text: $fileUrl)
                .textFieldStyle(.roundedBorder)
                .autocapitalization(.none)
                .disableAutocorrection(true)

            Button("Transfer") {
                runTransfer()
            }
            .buttonStyle(.borderedProminent)
            .disabled(fileUrl.isEmpty || viewModel.connectedDevice == nil || isBusy)
        }
    }

    private static let statusOptions = ["DRAFT", "PUBLISHED"]

    private var firmwareSection: some View {
        Section("Firmware Update") {
            LabeledContent("Current Version", value: viewModel.version.isEmpty ? "—" : viewModel.version)

            HStack {
                Text("Identifier")
                TextField("duomi", text: $firmwareBrand)
                    .textFieldStyle(.roundedBorder)
                    .autocapitalization(.none)
                    .disableAutocorrection(true)
            }

            Picker("Status", selection: $firmwareStatus) {
                ForEach(Self.statusOptions, id: \.self) { Text($0) }
            }
            .pickerStyle(.segmented)

            if let info = firmwareInfo {
                VStack(alignment: .leading, spacing: 6) {
                    LabeledContent("Latest", value: info.version)
                    LabeledContent("Has Update", value: viewModel.sdk.hasNewerFirmware(deviceVersion: viewModel.version, serverVersion: info.version) ? "Yes" : "No")
                    if let size = info.fileSize {
                        let bytes = Int(size) ?? 0
                        LabeledContent("Size", value: ByteCountFormatter.string(fromByteCount: Int64(bytes), countStyle: .file))
                    }
                    if let md5 = info.fileMd5, !md5.isEmpty {
                        LabeledContent("MD5", value: md5).font(.caption2)
                    }
                    if let desc = info.description, !desc.isEmpty {
                        Text(desc).font(.caption).foregroundStyle(.secondary)
                    }
                    Text(info.fileUrl).font(.caption2).foregroundStyle(.secondary).lineLimit(2)
                }
            }

            if let err = firmwareError {
                Text(err).font(.caption).foregroundStyle(.red)
            }

            if firmwareLoading {
                HStack {
                    ProgressView().controlSize(.small)
                    Text("Fetching...").font(.caption).foregroundStyle(.secondary)
                }
            }

            HStack {
                Button("Get Update Info") {
                    runFetchFirmwareInfo()
                }
                .buttonStyle(.bordered)
                .disabled(firmwareLoading || firmwareBrand.isEmpty)

                Button("Upgrade") {
                    runUpgradeFirmware()
                }
                .buttonStyle(.borderedProminent)
                .disabled(firmwareInfo?.fileUrl.isEmpty != false || viewModel.connectedDevice == nil || isBusy || firmwareLoading)
            }
        }
    }

    private var deviceFilesSection: some View {
        Section("Device Files (\(deviceFiles.count))") {
            if deviceFiles.isEmpty {
                Text("Bind 后显示设备文件")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
            ForEach(deviceFiles, id: \.self) { rawKey in
                let fileUrl = CDNHelper.ensureFullUrl(rawKey)
                HStack {
                    if CDNHelper.isImage(fileUrl), let url = URL(string: fileUrl) {
                        AsyncImage(url: url) { phase in
                            switch phase {
                            case .success(let image):
                                image.resizable().aspectRatio(contentMode: .fill)
                            case .failure:
                                Image(systemName: "photo").foregroundStyle(.secondary)
                            default:
                                ProgressView()
                            }
                        }
                        .frame(width: 50, height: 50)
                        .clipShape(RoundedRectangle(cornerRadius: 6))
                    } else {
                        Image(systemName: "film")
                            .frame(width: 50, height: 50)
                            .foregroundStyle(.secondary)
                    }

                    Text(rawKey)
                        .font(.caption2)
                        .lineLimit(2)

                    Spacer()

                    Button(role: .destructive) {
                        runDeleteFile(rawKey)
                    } label: {
                        Image(systemName: "trash")
                    }
                    .buttonStyle(.borderless)
                    .disabled(isBusy)
                }
            }
        }
    }

    private var logSection: some View {
        Section("Log (\(logs.count))") {
            ForEach(logs.prefix(80)) { line in
                Text(line.message)
                    .font(.caption)
                    .foregroundStyle(line.level == .error ? .red : line.level == .success ? .green : .primary)
            }
        }
    }

    // MARK: - Logging

    private func log(_ message: String, level: LogLine.Level = .info) {
        logs.insert(LogLine(level: level, message: message), at: 0)
        if logs.count > 200 { logs.removeLast() }
    }

    // MARK: - Actions (callback-based)

    private func runConnect(deviceId: String) {
        connectingDeviceId = deviceId
        log("→ connect(\(deviceId))")
        viewModel.sdk.connect(deviceId: deviceId) { [self] result in
            DispatchQueue.main.async {
                self.connectingDeviceId = nil
                switch result {
                case .success(let device):
                    self.log("connect ✓ \(device.name ?? device.id)", level: .success)
                case .failure(let error):
                    self.log("connect ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runDisconnect() {
        log("→ disconnect")
        viewModel.sdk.disconnect { [self] result in
            DispatchQueue.main.async {
                switch result {
                case .success:
                    self.deviceFiles = []
                    self.log("disconnect ✓", level: .success)
                case .failure(let error):
                    self.log("disconnect ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runGetDeviceInfo() {
        isBusy = true
        log("→ getDeviceInfo")
        viewModel.sdk.getDeviceInfo { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success(let info):
                    self.log("getDeviceInfo ✓ brand=\(info.brand) power=\(info.powerlevel)%", level: .success)
                case .failure(let error):
                    self.log("getDeviceInfo ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runGetVersion() {
        isBusy = true
        log("→ getVersion")
        viewModel.sdk.getVersion { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success(let info):
                    self.log("getVersion ✓ \(info.version)", level: .success)
                case .failure(let error):
                    self.log("getVersion ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runBind() {
        isBusy = true
        log("→ bind(\(userId))")
        viewModel.sdk.bind(userId: userId) { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success(let resp):
                    self.log("bind ✓ sn=\(resp.sn) contents=\(resp.contents.count)", level: .success)
                    self.deviceFiles = resp.contents
                case .failure(let error):
                    self.log("bind ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runUnbind() {
        isBusy = true
        log("→ unbind(\(userId))")
        viewModel.sdk.unbind(userId: userId) { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success:
                    self.deviceFiles = []
                    self.log("unbind ✓", level: .success)
                case .failure(let error):
                    self.log("unbind ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runTransfer() {
        isBusy = true
        log("→ transferMedia(\(fileUrl))")
        viewModel.sdk.transferMedia(fileUrl: fileUrl) { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success:
                    self.log("transfer ✓", level: .success)
                case .failure(let error):
                    self.log("transfer ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runDeleteFile(_ rawKey: String) {
        isBusy = true
        log("→ deleteFile(\(rawKey))")
        viewModel.sdk.deleteFile(key: rawKey) { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success:
                    self.log("deleteFile ✓", level: .success)
                    self.deviceFiles.removeAll { $0 == rawKey }
                case .failure(let error):
                    self.log("deleteFile ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runFetchFirmwareInfo() {
        let brand = firmwareBrand.trimmingCharacters(in: .whitespacesAndNewlines)
        guard !brand.isEmpty else {
            firmwareError = "No identifier specified"
            return
        }
        firmwareLoading = true
        firmwareError = nil
        log("→ fetchLatestFirmware(\(brand), \(firmwareStatus))")
        viewModel.sdk.fetchLatestFirmware(identifier: brand, status: firmwareStatus) { [self] result in
            DispatchQueue.main.async {
                self.firmwareLoading = false
                switch result {
                case .success(let info):
                    self.firmwareInfo = info
                    if let info = info {
                        let hasUpdate = self.viewModel.sdk.hasNewerFirmware(deviceVersion: self.viewModel.version, serverVersion: info.version)
                        self.log("firmware latest: \(info.version), hasUpdate=\(hasUpdate)", level: .success)
                    } else {
                        self.log("no firmware available", level: .info)
                    }
                case .failure(let error):
                    self.firmwareError = error.localizedDescription
                    self.log("firmware info ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }

    private func runUpgradeFirmware() {
        guard let info = firmwareInfo, !info.fileUrl.isEmpty else { return }
        isBusy = true
        log("→ upgradeFirmware \(info.version)")
        viewModel.sdk.upgradeFirmware(fileUrl: info.fileUrl) { [self] result in
            DispatchQueue.main.async {
                self.isBusy = false
                switch result {
                case .success:
                    self.log("OTA ✓", level: .success)
                case .failure(let error):
                    self.log("OTA ✗ \(error.localizedDescription)", level: .error)
                }
            }
        }
    }
}