import ByreAPI
import SwiftUI

struct QuickRunSetting: View {
    @Environment(Store.self) private var store
    @Environment(Overlays.self) private var overlays
    @ViewState private var workflows: [WorkflowSummary] = []
    @ViewState private var off: (() -> Void)?

    var body: some View {
        let current = store.me?.quickRun ?? .init(projectId: "", workflow: "")
        HStack(spacing: 6) {
            menu(current.workflow.isEmpty ? "None" : current.workflow, help: "Workflow the Action button starts") {
                Button("None") {
                    save(.init(projectId: "", workflow: ""))
                }
                ForEach(workflows, id: \.name) { w in
                    Button(w.name) {
                        save(.init(projectId: current.projectId.isEmpty ? store.projects.first?.id ?? "" : current.projectId, workflow: w.name))
                    }
                }
            }
            if !current.workflow.isEmpty {
                Text("in")
                    .foregroundStyle(Palette.muted)
                menu(store.projects.first { $0.id == current.projectId }?.name ?? current.projectId, help: "Project the workflow runs in") {
                    ForEach(store.projects, id: \.id) { p in
                        Button(p.name) {
                            save(.init(projectId: p.id, workflow: current.workflow))
                        }
                    }
                }
            }
        }
        .padding(.top, 8)
        .onAppear {
            off = store.events.add { ev in
                if ev.kind == "workflow.updated" || ev.kind == "workflow.deleted" {
                    load()
                }
            }
            load()
        }
        .onDisappear {
            off?()
            off = nil
        }
    }

    private func menu(_ label: String, help: String, @ViewBuilder _ items: () -> some View) -> some View {
        Menu {
            items()
        } label: {
            HStack(spacing: 8) {
                Text(label)
                Image(systemName: "chevron.up.chevron.down")
                    .font(Fonts.font(9, weight: 600))
            }
            .foregroundStyle(Palette.text)
            .modifier(FieldStyle())
            .contentShape(Rectangle())
        }
        .menuStyle(.button)
        .buttonStyle(.plain)
        .menuIndicator(.hidden)
        .fixedSize()
        .help(help)
    }

    private func load() {
        Task {
            do {
                workflows = try await store.api.client.listWorkflows().ok.body.json
            } catch {
                overlays.showAlert(errorText(error))
            }
        }
    }

    private func save(_ q: Components.Schemas.QuickRun) {
        Task {
            do {
                store.me = try await store.api.client.updateQuickRun(body: .json(q)).ok.body.json
            } catch {
                overlays.showAlert(errorText(error))
            }
        }
    }
}

#if os(iOS)
import AppIntents

@MainActor
@Observable
final class QuickRunRequest {
    static let shared = QuickRunRequest()
    var shown = false
}

struct QuickRunIntent: AppIntent {
    static let title: LocalizedStringResource = "Run byre workflow"
    static let description = IntentDescription("Opens byre to type a prompt and start your Action button workflow with it.")
    static let supportedModes: IntentModes = .foreground

    @MainActor
    func perform() async throws -> some IntentResult {
        QuickRunRequest.shared.shown = true
        return .result()
    }
}

struct ByreShortcuts: AppShortcutsProvider {
    static var appShortcuts: [AppShortcut] {
        AppShortcut(intent: QuickRunIntent(), phrases: ["Run a workflow in \(.applicationName)"], shortTitle: "Run workflow", systemImageName: "bolt")
    }
}

struct QuickRunPage: View {
    @Environment(Store.self) private var store
    @ViewState private var text = ""
    @ViewState private var starting = false
    @ViewState private var failure: String?
    @FocusState private var focused: Bool

    var body: some View {
        let q = store.me?.quickRun ?? .init(projectId: "", workflow: "")
        let project = store.projects.first { $0.id == q.projectId }
        let prompt = text.trimmingCharacters(in: .whitespacesAndNewlines)
        VStack(alignment: .leading, spacing: 12) {
            HStack {
                Button("Cancel") {
                    close()
                }
                .disabled(starting)
                Spacer()
                if !q.workflow.isEmpty {
                    Button("Start") {
                        start(q, prompt)
                    }
                    .buttonStyle(WebButtonStyle(primary: true))
                    .disabled(prompt.isEmpty || starting)
                }
            }
            .font(Fonts.font(15, weight: 700))
            if q.workflow.isEmpty {
                Text("Choose the workflow the Action button starts in More → Settings.")
                    .foregroundStyle(Palette.muted)
                    .fixedSize(horizontal: false, vertical: true)
            } else {
                VStack(alignment: .leading, spacing: 2) {
                    Text(q.workflow)
                        .font(Fonts.font(17, weight: 700))
                    Text(project?.name ?? q.projectId)
                        .foregroundStyle(Palette.muted)
                }
                AgentEditor(text: $text, placeholder: "What should it do?", key: "quick-run", height: 220, focus: $focused, border: focused ? Palette.accent : Palette.border) {
                    start(q, prompt)
                }
            }
            if let failure {
                Text(failure)
                    .foregroundStyle(Palette.danger)
                    .textSelection(.enabled)
                    .fixedSize(horizontal: false, vertical: true)
            }
            Spacer(minLength: 0)
        }
        .padding(16)
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
        .foregroundStyle(Palette.text)
        .tint(Palette.accent)
        .background(Palette.bg)
        .font(Fonts.font(13))
        .onAppear {
            focused = true
        }
    }

    private func start(_ q: Components.Schemas.QuickRun, _ prompt: String) {
        if prompt.isEmpty || starting {
            return
        }
        starting = true
        failure = nil
        Task {
            do {
                let task = try await store.api.client.createTask(path: .init(projectId: q.projectId), body: .json(.init(prompt: prompt, workflow: q.workflow))).created.body.json
                close()
                store.focusTask(task.id)
            } catch {
                starting = false
                failure = errorText(error)
            }
        }
    }

    private func close() {
        text = ""
        starting = false
        failure = nil
        QuickRunRequest.shared.shown = false
    }
}
#endif