// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
// Copyright (C) 2026 Rune Olsen

import SwiftUI

/// Shown when an External MCP server's stdio `command` (typically `npx`) couldn't be found on
/// PATH — the common cause is Node.js not being installed, or being installed somewhere Confab's
/// PATH probing doesn't check. Offers a copyable install command, a one-click install via Homebrew
/// (if present), and a link to the official Node.js installer as a fallback.
struct NodeInstallHelpSheet: View {
    let missingCommand: String
    let onRetry: () -> Void
    let onDone: () -> Void

    @State private var isInstalling = false
    @State private var installResult: NodeInstallHelper.InstallResult?
    @State private var copiedFeedback = false

    private var homebrewPrefix: String? { LoginShellEnvironment.homebrewPrefix() }

    var body: some View {
        VStack(alignment: .leading, spacing: 20) {
            HStack(spacing: 12) {
                Image(systemName: "shippingbox")
                    .font(.title2)
                    .foregroundStyle(.orange)
                VStack(alignment: .leading, spacing: 2) {
                    Text("Node.js Required")
                        .font(.system(size: 17, weight: .semibold))
                    Text("'\(missingCommand)' couldn't be found on your Mac")
                        .font(.system(size: 13))
                        .foregroundStyle(.secondary)
                }
                Spacer()
            }

            Text("This MCP server is launched with '\(missingCommand)', which comes bundled with Node.js. Confab checked its usual install locations (Homebrew, MacPorts, Volta, nvm) and didn't find it there either.")
                .font(.system(size: 13))
                .fixedSize(horizontal: false, vertical: true)

            if let homebrewPrefix {
                VStack(alignment: .leading, spacing: 8) {
                    Text("Homebrew is installed — this is the easiest way to install Node.js:")
                        .font(.system(size: 13, weight: .medium))

                    HStack(spacing: 8) {
                        Text("brew install node")
                            .font(.system(size: 13, design: .monospaced))
                            .textSelection(.enabled)
                            .padding(.horizontal, 10)
                            .padding(.vertical, 6)
                            .background(Color.secondary.opacity(0.1))
                            .clipShape(RoundedRectangle(cornerRadius: 6))
                        Button(copiedFeedback ? "Copied" : "Copy") {
                            NSPasteboard.general.clearContents()
                            NSPasteboard.general.setString("brew install node", forType: .string)
                            copiedFeedback = true
                        }
                        .buttonStyle(.bordered)
                    }

                    if isInstalling {
                        HStack(spacing: 8) {
                            ProgressView().controlSize(.small)
                            Text("Installing — this can take a minute…")
                                .font(.system(size: 12))
                                .foregroundStyle(.secondary)
                        }
                    } else {
                        Button("Install Now") {
                            Task {
                                isInstalling = true
                                installResult = await NodeInstallHelper.installNode(homebrewPrefix: homebrewPrefix)
                                isInstalling = false
                            }
                        }
                        .buttonStyle(.borderedProminent)
                    }

                    if let installResult {
                        VStack(alignment: .leading, spacing: 4) {
                            Text(installResult.success ? "✓ Installed successfully" : "✗ Install failed")
                                .font(.system(size: 13, weight: .medium))
                                .foregroundStyle(installResult.success ? .green : .red)
                            if !installResult.success && !installResult.output.isEmpty {
                                ScrollView {
                                    Text(installResult.output)
                                        .font(.system(size: 11, design: .monospaced))
                                        .textSelection(.enabled)
                                        .frame(maxWidth: .infinity, alignment: .leading)
                                }
                                .frame(maxHeight: 120)
                                .padding(8)
                                .background(Color.secondary.opacity(0.08))
                                .clipShape(RoundedRectangle(cornerRadius: 6))
                            }
                        }
                    }
                }
                .padding(12)
                .background(Color.secondary.opacity(0.05))
                .clipShape(RoundedRectangle(cornerRadius: 10))
            } else {
                VStack(alignment: .leading, spacing: 8) {
                    Text("Homebrew wasn't found either. Install Node.js directly from its official installer:")
                        .font(.system(size: 13))
                        .fixedSize(horizontal: false, vertical: true)
                    Button("Open nodejs.org") {
                        NSWorkspace.shared.open(URL(string: "https://nodejs.org")!)
                    }
                    .buttonStyle(.bordered)
                }
                .padding(12)
                .background(Color.secondary.opacity(0.05))
                .clipShape(RoundedRectangle(cornerRadius: 10))
            }

            Text("After installing, click Retry Connection below to try again.")
                .font(.system(size: 12))
                .foregroundStyle(.secondary)

            HStack {
                Button("Open nodejs.org") {
                    NSWorkspace.shared.open(URL(string: "https://nodejs.org")!)
                }
                Spacer()
                Button("Done") { onDone() }
                Button("Retry Connection") {
                    onRetry()
                    onDone()
                }
                .buttonStyle(.borderedProminent)
            }
        }
        .padding(24)
        .frame(minWidth: 480, minHeight: 340)
    }
}