import AppKit
import SwiftUI
import ShotdeckCore

struct MenuBarView: View {
    @Environment(AppModel.self) private var model

    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            statusRow
            SessionStrip()
            Divider()
            actionsList
            if !model.allReturns.isEmpty {
                Divider()
                returnsBlock
            }
        }
        .padding(10)
        .frame(width: 320, alignment: .leading)
        .controlSize(.small)
    }

    @ViewBuilder
    private var statusRow: some View {
        if !model.screenRecordingGranted {
            HStack(alignment: .top, spacing: 6) {
                Image(systemName: "exclamationmark.triangle")
                    .foregroundStyle(.yellow)
                VStack(alignment: .leading, spacing: 4) {
                    Text(
                        ShotdeckError.screenRecordingNotGranted.errorDescription
                            ?? "Screen Recording is turned off."
                    )
                    .font(.caption)
                    .fixedSize(horizontal: false, vertical: true)
                    Button("Open Screen Recording settings") {
                        model.openScreenRecordingSettings()
                    }
                }
            }
        } else {
            Text(model.statusLine ?? defaultStatusText)
                .font(.caption)
                .foregroundStyle(.primary)
                .fixedSize(horizontal: false, vertical: true)
        }
    }

    private var defaultStatusText: String {
        guard let region = model.region else {
            return "No region yet — press \(model.hotkeyDisplayString) to pick one."
        }
        let w = Int(region.rect.width)
        let h = Int(region.rect.height)
        let display = displayName(for: region)
        if model.session.isEmpty {
            return "Region \(w) × \(h) on \(display) · Nothing captured yet."
        }
        let count = model.session.captures.count
        return "\(count) captures · region \(w) × \(h) on \(display)"
    }

    private func displayName(for region: CaptureRegion) -> String {
        for (index, screen) in NSScreen.screens.enumerated() {
            let id = (screen.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as? NSNumber)?
                .uint32Value
            if id == region.displayID {
                return "Display \(index + 1)"
            }
        }
        return "Display 1"
    }

    private var actionsList: some View {
        VStack(alignment: .leading, spacing: 2) {
            Button {
                let anchor = NSApp.keyWindow?.contentView
                if let sender = model as? SendCapable {
                    Task { await sender.send(anchor: anchor) }
                } else {
                    model.setStatus("Send is not available in this build.")
                }
            } label: {
                actionLabel("Send…")
            }
            .disabled(model.session.isEmpty || model.isSending)

            Button {
                Task { await model.captureNow() }
            } label: {
                actionLabel("Capture now", trailing: model.hotkeyDisplayString)
            }
            .disabled(model.isCapturing)

            Button {
                Task { await model.rePickRegion() }
            } label: {
                actionLabel("Re-select area")
            }

            Button {
                Task { await model.copyCommentedLinks() }
            } label: {
                actionLabel(
                    "Copy commented links",
                    trailing: model.commentedReturns.isEmpty ? nil : "\(model.commentedReturns.count)"
                )
            }
            .disabled(model.commentedReturns.isEmpty)

            Button {
                model.openSpoolFolder()
            } label: {
                actionLabel("Open spool folder")
            }

            Button {
                if let presenter = model as? SettingsWindowPresenting {
                    presenter.presentSettingsWindow()
                } else {
                    model.setStatus("Settings is not available in this build.")
                }
            } label: {
                actionLabel("Settings…")
            }

            Button {
                NSApp.terminate(nil)
            } label: {
                actionLabel("Quit Redline")
            }
        }
        .buttonStyle(.plain)
    }

    private func actionLabel(_ title: String, trailing: String? = nil) -> some View {
        HStack(spacing: 8) {
            Text(title)
            Spacer(minLength: 8)
            if let trailing {
                Text(trailing)
                    .foregroundStyle(.secondary)
                    .monospacedDigit()
            }
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .contentShape(Rectangle())
        .padding(.vertical, 3)
    }

    @ViewBuilder
    private var returnsBlock: some View {
        if let provider = model as? ReturnsSectionProviding {
            provider.returnsSection()
        } else {
            VStack(alignment: .leading, spacing: 4) {
                Text("Came back from your device")
                    .font(.caption)
                    .foregroundStyle(.secondary)
                ForEach(newestReturns.prefix(8)) { doc in
                    HStack(spacing: 8) {
                        Text(doc.fileURL.lastPathComponent)
                            .lineLimit(1)
                        Spacer(minLength: 8)
                        Text(doc.isCommented
                             ? "\(doc.annotatedPages.count) page\(doc.annotatedPages.count == 1 ? "" : "s") marked"
                             : "not marked")
                            .font(.caption)
                            .foregroundStyle(doc.isCommented ? .primary : .secondary)
                    }
                }
            }
        }
    }

    private var newestReturns: [ReturnedDocument] {
        model.allReturns.sorted { $0.detectedAt > $1.detectedAt }
    }
}