gramora/gramora/Views/SummarizerView.swift

import SwiftUI

struct SummarizerView: View {
    @StateObject private var viewModel = SummarizerViewModel()
    @Environment(\.onSettingsTapped) private var onSettingsTapped
    @Environment(\.requirePremiumAccess) private var requirePremiumAccess

    let restoreEntry: HistoryEntry?
    let onRestoreHandled: () -> Void

    init(restoreEntry: HistoryEntry? = nil, onRestoreHandled: @escaping () -> Void = {}) {
        self.restoreEntry = restoreEntry
        self.onRestoreHandled = onRestoreHandled
    }

    var body: some View {
        GeometryReader { proxy in
            let dynamicHorizontalPadding = min(max(proxy.size.width * 0.045, AppTheme.contentPadding), 52)
            let dynamicBottomPadding = min(max(proxy.size.height * 0.04, 20), 40)

            Group {
                if viewModel.isSummarizing {
                    loadingLayout(
                        horizontalPadding: dynamicHorizontalPadding,
                        topPadding: AppTheme.brandLabelTopInset,
                        bottomPadding: dynamicBottomPadding
                    )
                } else if viewModel.hasResults {
                    VStack(alignment: .leading, spacing: 0) {
                        header
                            .padding(.bottom, 20)

                        resultsLayout
                            .frame(maxWidth: .infinity, maxHeight: .infinity)
                    }
                    .frame(maxWidth: 1200, maxHeight: .infinity, alignment: .topLeading)
                    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
                    .padding(.horizontal, dynamicHorizontalPadding)
                    .padding(.top, AppTheme.brandLabelTopInset)
                    .padding(.bottom, dynamicBottomPadding)
                } else {
                    VStack(alignment: .leading, spacing: 0) {
                        header
                            .padding(.bottom, 24)

                        contentCard
                            .frame(maxWidth: .infinity, maxHeight: .infinity)

                        if let errorMessage = viewModel.errorMessage {
                            Text(errorMessage)
                                .font(.system(size: 14))
                                .foregroundStyle(.red)
                                .padding(.top, 12)
                        }

                        GradientButton(title: viewModel.isSummarizing ? "Summarizing..." : "Summarize") {
                            guard requirePremiumAccess() else { return }
                            viewModel.summarize()
                        }
                        .disabled(!viewModel.canSummarize)
                        .padding(.top, 16)
                    }
                    .frame(maxWidth: 1200, maxHeight: .infinity, alignment: .topLeading)
                    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
                    .padding(.horizontal, dynamicHorizontalPadding)
                    .padding(.top, AppTheme.brandLabelTopInset)
                    .padding(.bottom, dynamicBottomPadding)
                }
            }
        }
        .clearHostingBackground()
        .onChange(of: viewModel.text) { _ in
            viewModel.handleTextChange()
        }
        .onAppear(perform: restoreIfNeeded)
        .onChange(of: restoreEntry?.id) { _ in
            restoreIfNeeded()
        }
    }

    private func restoreIfNeeded() {
        guard let restoreEntry else { return }
        viewModel.restore(from: restoreEntry)
        onRestoreHandled()
    }

    private func loadingLayout(
        horizontalPadding: CGFloat,
        topPadding: CGFloat,
        bottomPadding: CGFloat
    ) -> some View {
        VStack(spacing: 14) {
            ProgressView()
                .controlSize(.regular)

            Text("Loading...")
                .font(.system(size: 16, weight: .semibold))
                .foregroundStyle(AppTheme.textPrimary)

            Text("Summarizing your content")
                .font(.system(size: 14))
                .foregroundStyle(AppTheme.textSecondary)
        }
        .frame(maxWidth: 1200, maxHeight: .infinity, alignment: .center)
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
        .padding(.horizontal, horizontalPadding)
        .padding(.top, topPadding)
        .padding(.bottom, bottomPadding)
    }

    private var header: some View {
        VStack(alignment: .leading, spacing: 16) {
            if viewModel.hasResults {
                IconButton(iconName: "arrow.left") {
                    viewModel.resetResults()
                }
                .accessibilityLabel("Go back")
            }

            HStack(alignment: .top) {
                VStack(alignment: .leading, spacing: 8) {
                    Text("Summarizer")
                        .font(.system(size: 30, weight: .bold))
                        .foregroundStyle(AppTheme.textPrimary)

                    HStack(spacing: 0) {
                        Text("Read ")
                            .foregroundStyle(AppTheme.textSecondary)
                        Text("less")
                            .fontWeight(.semibold)
                            .foregroundStyle(AppTheme.teal)
                        Text(". Understand ")
                            .foregroundStyle(AppTheme.textSecondary)
                        Text("more")
                            .fontWeight(.semibold)
                            .foregroundStyle(AppTheme.teal)
                        Text(".")
                            .foregroundStyle(AppTheme.textSecondary)
                    }
                    .font(.system(size: 15))
                }

                Spacer()

                IconButton(icon: { SettingsGearIcon() }, action: onSettingsTapped)
                .accessibilityLabel("Settings")
            }
        }
    }

    private var contentCard: some View {
        VStack(alignment: .leading, spacing: AppTheme.contentCardSpacing) {
            YourContentHeader()

            VStack(alignment: .leading, spacing: 6) {
                textEditor
                    .background(AppTheme.surface)
                    .clipShape(RoundedRectangle(cornerRadius: AppTheme.inputCornerRadius))
                    .overlay(
                        RoundedRectangle(cornerRadius: AppTheme.inputCornerRadius)
                            .stroke(AppTheme.inputBorder, lineWidth: 1)
                    )

                Text(viewModel.wordCountLimitLabel)
                    .font(.system(size: 11))
                    .foregroundStyle(AppTheme.textMuted)
                    .frame(maxWidth: .infinity, alignment: .trailing)
            }
            .scrollSafeEditorSectionFrame(compact: false)

            HStack(spacing: 8) {
                ToolbarButton(title: "Paste Text", iconName: "doc.on.clipboard") {
                    viewModel.pasteText()
                }

                ToolbarButton(title: "Upload File", iconName: "square.and.arrow.up") {
                    viewModel.uploadFile()
                }

                Spacer()

                ClearButton {
                    viewModel.clearText()
                }
            }
        }
        .inputContentCardPadding()
        .scrollSafeContentCardFrame(compact: false)
        .background(AppTheme.cardBackground)
        .clipShape(RoundedRectangle(cornerRadius: AppTheme.cardCornerRadius))
        .overlay(
            RoundedRectangle(cornerRadius: AppTheme.cardCornerRadius)
                .stroke(AppTheme.border, lineWidth: 1)
        )
        .shadow(color: AppTheme.cardShadow, radius: 16, y: 6)
    }

    private var textEditor: some View {
        ThinCaretTextEditor(
            text: $viewModel.text,
            placeholder: "Type or paste your text here and press the summarize button...",
            maxWords: SummarizerViewModel.maxWords,
            onWordLimitReached: viewModel.notifyWordLimitReached
        )
        .font(.system(size: 14))
        .foregroundStyle(AppTheme.textPrimary)
        .scrollSafeTextEditorFrame(compact: false)
    }

    private var resultsLayout: some View {
        summaryCard
    }

    private var summaryCard: some View {
        VStack(alignment: .leading, spacing: 12) {
            HStack {
                Text("Summary")
                    .font(.system(size: 13, weight: .semibold))
                    .foregroundStyle(AppTheme.textPrimary)

                Spacer()

                ToolbarButton(title: "Copy", iconName: "doc.on.doc") {
                    viewModel.copySummary()
                }
                .disabled(viewModel.summary.isEmpty)
                .opacity(viewModel.summary.isEmpty ? 0.55 : 1)
            }

            Text(viewModel.summary)
                .font(.system(size: 14))
                .foregroundStyle(AppTheme.textPrimary)
                .frame(maxWidth: .infinity, alignment: .leading)
                .padding(16)
                .background(AppTheme.tealLight.opacity(0.35))
                .clipShape(RoundedRectangle(cornerRadius: AppTheme.inputCornerRadius))
                .overlay(
                    RoundedRectangle(cornerRadius: AppTheme.inputCornerRadius)
                        .stroke(AppTheme.teal.opacity(0.2), lineWidth: 1)
                )
        }
        .padding(AppTheme.contentCardPadding)
        .background(AppTheme.cardBackground)
        .clipShape(RoundedRectangle(cornerRadius: AppTheme.cardCornerRadius))
        .overlay(
            RoundedRectangle(cornerRadius: AppTheme.cardCornerRadius)
                .stroke(AppTheme.border, lineWidth: 1)
        )
        .shadow(color: AppTheme.cardShadow, radius: 16, y: 6)
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
    }
}