import SwiftUI

struct ReportView: View {
    @Environment(AuthManager.self) private var auth
    @Environment(\.dismiss) private var dismiss

    let client: XRPCClient
    let subjectUri: String
    let subjectCid: String

    @Environment(LabelDefinitionsCache.self) private var labelDefsCache
    @State private var selectedLabel = ""

    private var labelDefs: [LabelDefinition] {
        labelDefsCache.definitions
    }

    @State private var reason = ""
    @State private var isSubmitting = false
    @State private var isSubmitted = false
    @State private var error: String?

    var body: some View {
        NavigationStack {
            Group {
                if isSubmitted {
                    ContentUnavailableView(
                        "Report submitted",
                        systemImage: "checkmark.circle",
                        description: Text("Thank you. Your report has been submitted for review.")
                    )
                } else {
                    Form {
                        Section("Category") {
                            Picker("Category", selection: $selectedLabel) {
                                ForEach(labelDefs) { def in
                                    Text(def.displayName).tag(def.identifier)
                                }
                            }
                            .pickerStyle(.inline)
                            .labelsHidden()
                            .onAppear {
                                if selectedLabel.isEmpty {
                                    selectedLabel = labelDefs.first?.identifier ?? ""
                                }
                            }
                        }

                        Section("Details (optional)") {
                            TextField("Provide additional context...", text: $reason, axis: .vertical)
                                .lineLimit(3 ... 6)
                        }

                        if let error {
                            Section {
                                Text(error)
                                    .foregroundStyle(.red)
                                    .font(.subheadline)
                            }
                        }
                    }
                }
            }
            .navigationTitle(isSubmitted ? "" : "Report content")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button(isSubmitted ? "Done" : "Cancel") {
                        dismiss()
                    }
                }
                if !isSubmitted {
                    ToolbarItem(placement: .confirmationAction) {
                        Button("Submit") {
                            Task { await submit() }
                        }
                        .disabled(selectedLabel.isEmpty || isSubmitting)
                    }
                }
            }
        }
    }

    private func submit() async {
        guard !selectedLabel.isEmpty, !isSubmitting else { return }
        isSubmitting = true
        error = nil
        do {
            try await client.createReport(
                subjectUri: subjectUri,
                subjectCid: subjectCid,
                label: selectedLabel,
                reason: reason.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty ? nil : reason.trimmingCharacters(in: .whitespacesAndNewlines),
                auth: auth.authContext()
            )
            isSubmitted = true
        } catch {
            self.error = "Failed to submit report. Please try again."
        }
        isSubmitting = false
    }
}

#Preview {
    ReportView(
        client: .preview,
        subjectUri: "at://did:plc:preview/social.grain.gallery/r1",
        subjectCid: "cid"
    )
    .previewEnvironments()
}