import AppKit
import SwiftUI
import UniformTypeIdentifiers

struct DebugSettings: View {
    @AppStorage(modelCatalogPathKey) private var modelCatalogPath: String = ModelCatalogLoader.defaultPath
    @AppStorage(modelCatalogReloadKey) private var modelCatalogReloadBump: Int = 0
    @State private var modelsCount: Int?
    @State private var modelsLoading = false
    @State private var modelsError: String?
    @ObservedObject private var relayManager = RelayProcessManager.shared
    @State private var relayRootInput: String = RelayProcessManager.shared.projectRootPath()

    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            LabeledContent("PID") { Text("\(ProcessInfo.processInfo.processIdentifier)") }
            LabeledContent("Log file") {
                Button("Open pino log") { self.openLog() }
                    .help(self.pinoLogPath)
                Text(self.pinoLogPath)
                    .font(.caption2.monospaced())
                    .foregroundStyle(.secondary)
                    .textSelection(.enabled)
            }
            LabeledContent("Binary path") { Text(Bundle.main.bundlePath).font(.footnote) }
            LabeledContent("Relay status") {
                VStack(alignment: .leading, spacing: 2) {
                    Text(self.relayManager.status.label)
                    Text("Restarts: \(self.relayManager.restartCount)")
                        .font(.caption2)
                        .foregroundStyle(.secondary)
                }
            }
            VStack(alignment: .leading, spacing: 4) {
                Text("Relay stdout/stderr")
                    .font(.caption.weight(.semibold))
                ScrollView {
                    Text(self.relayManager.log.isEmpty ? "—" : self.relayManager.log)
                        .font(.caption.monospaced())
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .textSelection(.enabled)
                }
                .frame(height: 180)
                .overlay(RoundedRectangle(cornerRadius: 6).stroke(Color.secondary.opacity(0.2)))
            }
            VStack(alignment: .leading, spacing: 6) {
                Text("Clawdis project root")
                    .font(.caption.weight(.semibold))
                HStack(spacing: 8) {
                    TextField("Path to clawdis repo", text: self.$relayRootInput)
                        .textFieldStyle(.roundedBorder)
                        .font(.caption.monospaced())
                        .onSubmit { self.saveRelayRoot() }
                    Button("Save") { self.saveRelayRoot() }
                        .buttonStyle(.borderedProminent)
                    Button("Reset") {
                        let def = FileManager.default.homeDirectoryForCurrentUser
                            .appendingPathComponent("Projects/clawdis").path
                        self.relayRootInput = def
                        self.saveRelayRoot()
                    }
                    .buttonStyle(.bordered)
                }
                Text("Used for pnpm/node fallback and PATH population when launching the relay.")
                    .font(.caption2)
                    .foregroundStyle(.secondary)
            }
            LabeledContent("Model catalog") {
                VStack(alignment: .leading, spacing: 6) {
                    Text(self.modelCatalogPath)
                        .font(.caption.monospaced())
                        .foregroundStyle(.secondary)
                        .lineLimit(2)
                    HStack(spacing: 8) {
                        Button {
                            self.chooseCatalogFile()
                        } label: {
                            Label("Choose models.generated.ts…", systemImage: "folder")
                        }
                        .buttonStyle(.bordered)

                        Button {
                            Task { await self.reloadModels() }
                        } label: {
                            Label(self.modelsLoading ? "Reloading…" : "Reload models", systemImage: "arrow.clockwise")
                        }
                        .buttonStyle(.bordered)
                        .disabled(self.modelsLoading)
                    }
                    if let modelsError {
                        Text(modelsError)
                            .font(.footnote)
                            .foregroundStyle(.secondary)
                    } else if let modelsCount {
                        Text("Loaded \(modelsCount) models")
                            .font(.footnote)
                            .foregroundStyle(.secondary)
                    }
                    Text("Used by the Config tab model picker; point at a different build when debugging.")
                        .font(.footnote)
                        .foregroundStyle(.tertiary)
                }
            }
            Button("Send Test Notification") {
                Task { _ = await NotificationManager().send(title: "Clawdis", body: "Test notification", sound: nil) }
            }
            .buttonStyle(.bordered)
            HStack {
                Button("Restart app") { self.relaunch() }
                Button("Reveal app in Finder") { self.revealApp() }
            }
            .buttonStyle(.bordered)
            Spacer()
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding(.horizontal, 12)
        .task { await self.reloadModels() }
    }

    private var pinoLogPath: String {
        let df = DateFormatter()
        df.calendar = Calendar(identifier: .iso8601)
        df.locale = Locale(identifier: "en_US_POSIX")
        df.dateFormat = "yyyy-MM-dd"
        let today = df.string(from: Date())
        // Prefer rolling log; fall back to legacy single-file path.
        let rolling = URL(fileURLWithPath: "/tmp/clawdis/clawdis-\(today).log").path
        if FileManager.default.fileExists(atPath: rolling) { return rolling }
        return "/tmp/clawdis.log"
    }

    private func openLog() {
        let path = self.pinoLogPath
        let url = URL(fileURLWithPath: path)
        if !FileManager.default.fileExists(atPath: path) {
            let alert = NSAlert()
            alert.messageText = "Log file not found"
            alert.informativeText = path
            alert.runModal()
            return
        }
        NSWorkspace.shared.activateFileViewerSelecting([url])
    }

    private func chooseCatalogFile() {
        let panel = NSOpenPanel()
        panel.title = "Select models.generated.ts"
        let tsType = UTType(filenameExtension: "ts")
            ?? UTType(tag: "ts", tagClass: .filenameExtension, conformingTo: .sourceCode)
            ?? .item
        panel.allowedContentTypes = [tsType]
        panel.allowsMultipleSelection = false
        panel.directoryURL = URL(fileURLWithPath: self.modelCatalogPath).deletingLastPathComponent()
        if panel.runModal() == .OK, let url = panel.url {
            self.modelCatalogPath = url.path
            self.modelCatalogReloadBump += 1
            Task { await self.reloadModels() }
        }
    }

    private func reloadModels() async {
        guard !self.modelsLoading else { return }
        self.modelsLoading = true
        self.modelsError = nil
        self.modelCatalogReloadBump += 1
        defer { self.modelsLoading = false }
        do {
            let loaded = try await ModelCatalogLoader.load(from: self.modelCatalogPath)
            self.modelsCount = loaded.count
        } catch {
            self.modelsCount = nil
            self.modelsError = error.localizedDescription
        }
    }

    private func relaunch() {
        let url = Bundle.main.bundleURL
        let task = Process()
        task.launchPath = "/usr/bin/open"
        task.arguments = [url.path]
        try? task.run()
        task.waitUntilExit()
        NSApp.terminate(nil)
    }

    private func revealApp() {
        let url = Bundle.main.bundleURL
        NSWorkspace.shared.activateFileViewerSelecting([url])
    }

    private func saveRelayRoot() {
        RelayProcessManager.shared.setProjectRoot(path: self.relayRootInput)
    }
}