import SwiftUI

private struct ExecApprovalPromptDialogModifier: ViewModifier {
    @Environment(NodeAppModel.self) private var appModel: NodeAppModel
    @AccessibilityFocusState private var approvalCardFocused: Bool
    let suppressedApproval: NodeAppModel.ExecApprovalInboxKey?

    func body(content: Content) -> some View {
        let prompt = self.presentedPrompt
        ZStack {
            content
                .allowsHitTesting(prompt == nil)
                .accessibilityHidden(prompt != nil)

            if let prompt {
                ZStack {
                    Color.black.opacity(0.38)
                        .ignoresSafeArea()
                        .accessibilityHidden(true)

                    ExecApprovalPromptCard(
                        prompt: prompt,
                        isResolving: self.appModel.pendingExecApprovalPromptResolving,
                        canDismiss: self.appModel.pendingExecApprovalPromptCanDismiss,
                        errorText: self.appModel.pendingExecApprovalPromptErrorText,
                        resolvedText: self.appModel.pendingExecApprovalPromptResolvedText,
                        resolvedTone: self.appModel.pendingExecApprovalPromptOutcome?.tone,
                        onAllowOnce: {
                            Task {
                                await self.appModel.resolvePendingExecApprovalPrompt(decision: "allow-once")
                            }
                        },
                        onAllowAlways: {
                            Task {
                                await self.appModel.resolvePendingExecApprovalPrompt(decision: "allow-always")
                            }
                        },
                        onDeny: {
                            Task {
                                await self.appModel.resolvePendingExecApprovalPrompt(decision: "deny")
                            }
                        },
                        onCancel: {
                            self.appModel.dismissPendingExecApprovalPrompt()
                        })
                        .frame(maxHeight: 680)
                        .padding(.horizontal, 20)
                        .padding(.vertical, 16)
                        .frame(maxWidth: 460)
                        .accessibilityElement(children: .contain)
                        .accessibilityAddTraits(.isModal)
                        .accessibilityFocused(self.$approvalCardFocused)
                        .onAppear { self.approvalCardFocused = true }
                        .transition(.scale(scale: 0.98).combined(with: .opacity))
                }
                .zIndex(1)
            }
        }
        .onChange(of: self.presentedPromptKey) { _, key in
            self.approvalCardFocused = key != nil
        }
        .animation(.easeInOut(duration: 0.18), value: self.presentedPromptKey)
    }

    private var presentedPrompt: NodeAppModel.ExecApprovalPrompt? {
        guard let prompt = self.appModel.pendingExecApprovalPrompt,
              NodeAppModel.execApprovalInboxKey(prompt) != self.suppressedApproval
        else { return nil }
        return prompt
    }

    private var presentedPromptKey: NodeAppModel.ExecApprovalInboxKey? {
        NodeAppModel.execApprovalInboxKey(self.presentedPrompt)
    }
}

private struct ExecApprovalPromptCard: View {
    let prompt: NodeAppModel.ExecApprovalPrompt
    let isResolving: Bool
    let canDismiss: Bool
    let errorText: String?
    let resolvedText: String?
    let resolvedTone: NodeAppModel.ExecApprovalOutcomeTone?
    let onAllowOnce: () -> Void
    let onAllowAlways: () -> Void
    let onDeny: () -> Void
    let onCancel: () -> Void

    var body: some View {
        VStack(spacing: 0) {
            ScrollView {
                self.reviewContent
                    .padding(18)
                    .frame(maxWidth: .infinity, alignment: .leading)
            }
            .accessibilityIdentifier("exec-approval-review-scroll")

            Divider()

            self.actionFooter
                .padding(18)
                .accessibilityIdentifier("exec-approval-actions")
        }
        .proPanelSurface(tint: OpenClawBrand.accentHot, radius: 20, isProminent: true)
    }

    private var reviewContent: some View {
        VStack(alignment: .leading, spacing: 14) {
            VStack(alignment: .leading, spacing: 6) {
                Text("Exec approval required")
                    .font(OpenClawType.headline)
                Text("Review this exec request before continuing. Your decision will be sent back to the gateway.")
                    .font(OpenClawType.subhead)
                    .foregroundStyle(.secondary)
            }

            Text(self.prompt.commandText)
                .font(OpenClawType.mono)
                .frame(maxWidth: .infinity, alignment: .leading)
                .padding(10)
                .background(
                    .black.opacity(0.14),
                    in: RoundedRectangle(cornerRadius: OpenClawRadius.md, style: .continuous))

            if let warningText = self.normalized(self.prompt.warningText) {
                Label {
                    Text(warningText)
                        .font(OpenClawType.footnote)
                } icon: {
                    Image(systemName: "exclamationmark.triangle.fill")
                }
                .foregroundStyle(OpenClawBrand.warn)
                .fixedSize(horizontal: false, vertical: true)
            }

            VStack(alignment: .leading, spacing: 8) {
                if let host = self.normalized(self.prompt.host) {
                    ExecApprovalPromptMetadataRow(label: "Host", value: host)
                }
                if let nodeId = self.normalized(self.prompt.nodeId) {
                    ExecApprovalPromptMetadataRow(label: "Node", value: nodeId)
                }
                if let agentId = self.normalized(self.prompt.agentId) {
                    ExecApprovalPromptMetadataRow(label: "Agent", value: agentId)
                }
                if let expiresText = self.expiresText(self.prompt.expiresAtMs) {
                    ExecApprovalPromptMetadataRow(label: "Expires", value: expiresText)
                }
            }

            if let errorText = self.normalized(self.errorText) {
                Text(errorText)
                    .font(OpenClawType.footnote)
                    .foregroundStyle(OpenClawBrand.danger)
            }

            if let resolvedText = self.normalized(self.resolvedText) {
                Text(resolvedText)
                    .font(OpenClawType.footnote)
                    .foregroundStyle(self.resolvedColor)
            }

            if self.isResolving {
                HStack(spacing: 8) {
                    ProgressView()
                        .progressViewStyle(.circular)
                    Text("Resolving…")
                        .font(OpenClawType.footnote)
                        .foregroundStyle(.secondary)
                }
            }
        }
    }

    private var actionFooter: some View {
        VStack(spacing: 10) {
            if self.resolvedText == nil {
                if self.prompt.allowsAllowOnce {
                    Button {
                        self.onAllowOnce()
                    } label: {
                        Text("Allow Once")
                            .font(OpenClawType.subheadSemiBold)
                            .frame(maxWidth: .infinity)
                    }
                    .buttonStyle(.borderedProminent)
                    .disabled(self.isResolving)
                }

                if self.prompt.allowsAllowAlways {
                    Button {
                        self.onAllowAlways()
                    } label: {
                        Text("Allow Always")
                            .font(OpenClawType.subheadSemiBold)
                            .frame(maxWidth: .infinity)
                    }
                    .buttonStyle(.bordered)
                    .disabled(self.isResolving)
                }

                ViewThatFits(in: .horizontal) {
                    HStack(spacing: 10) {
                        if self.prompt.allowsDeny {
                            self.denyButton
                        }
                        self.cancelButton
                    }

                    VStack(spacing: 10) {
                        if self.prompt.allowsDeny {
                            self.denyButton
                        }
                        self.cancelButton
                    }
                }
            } else {
                Button(role: .cancel) {
                    self.onCancel()
                } label: {
                    Text("Dismiss")
                        .font(OpenClawType.subheadSemiBold)
                        .frame(maxWidth: .infinity)
                }
                .buttonStyle(.bordered)
            }
        }
        .controlSize(.large)
        .frame(maxWidth: .infinity)
    }

    private var denyButton: some View {
        Button(role: .destructive) {
            self.onDeny()
        } label: {
            Text("Deny")
                .font(OpenClawType.subheadSemiBold)
                .frame(maxWidth: .infinity)
        }
        .buttonStyle(.bordered)
        .disabled(self.isResolving)
    }

    private var cancelButton: some View {
        Button(role: .cancel) {
            self.onCancel()
        } label: {
            Text("Cancel")
                .font(OpenClawType.subheadSemiBold)
                .frame(maxWidth: .infinity)
        }
        .buttonStyle(.bordered)
        .disabled(!self.canDismiss)
    }

    private func normalized(_ value: String?) -> String? {
        let trimmed = (value ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
        return trimmed.isEmpty ? nil : trimmed
    }

    private var resolvedColor: Color {
        switch self.resolvedTone {
        case .success:
            OpenClawBrand.ok
        case .danger:
            OpenClawBrand.danger
        case .warning:
            OpenClawBrand.warn
        case .neutral, nil:
            .secondary
        }
    }

    private func expiresText(_ expiresAtMs: Int64?) -> String? {
        guard let expiresAtMs else { return nil }
        let remainingSeconds = Int((Double(expiresAtMs) / 1000.0) - Date().timeIntervalSince1970)
        if remainingSeconds <= 0 {
            return "expired"
        }
        if remainingSeconds < 60 {
            return "under a minute"
        }
        if remainingSeconds < 3600 {
            let minutes = Int(ceil(Double(remainingSeconds) / 60.0))
            return minutes == 1 ? "about 1 minute" : "about \(minutes) minutes"
        }
        let hours = Int(ceil(Double(remainingSeconds) / 3600.0))
        return hours == 1 ? "about 1 hour" : "about \(hours) hours"
    }
}

private struct ExecApprovalPromptMetadataRow: View {
    let label: String
    let value: String

    var body: some View {
        VStack(alignment: .leading, spacing: 2) {
            Text(self.label)
                .font(OpenClawType.caption)
                .foregroundStyle(.secondary)
            Text(self.value)
                .font(OpenClawType.footnote)
                .textSelection(.enabled)
        }
    }
}

extension View {
    func execApprovalPromptDialog(
        suppressedApproval: NodeAppModel.ExecApprovalInboxKey? = nil) -> some View
    {
        modifier(ExecApprovalPromptDialogModifier(suppressedApproval: suppressedApproval))
    }
}