gramora/gramora/Views/ParaphrasingView.swift

import SwiftUI

struct ParaphrasingView: View {
    @StateObject private var viewModel = ParaphrasingViewModel()

    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.paraphrasedText.isEmpty {
                    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.isParaphrasing ? "Paraphrasing..." : "Paraphrase") {
                            viewModel.paraphrase()
                        }
                        .disabled(!viewModel.canParaphrase)
                        .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)
                } else {
                    ScrollView(.vertical, showsIndicators: false) {
                        VStack(alignment: .leading, spacing: 0) {
                            header
                                .padding(.bottom, 24)

                            contentCard
                                .padding(.bottom, 24)

                            outputCard
                                .padding(.bottom, 24)

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

                            GradientButton(title: viewModel.isParaphrasing ? "Paraphrasing..." : "Paraphrase") {
                                viewModel.paraphrase()
                            }
                            .disabled(!viewModel.canParaphrase)
                        }
                        .frame(maxWidth: 1200, alignment: .topLeading)
                        .frame(maxWidth: .infinity, alignment: .topLeading)
                        .padding(.horizontal, dynamicHorizontalPadding)
                        .padding(.top, AppTheme.brandLabelTopInset)
                        .padding(.bottom, dynamicBottomPadding)
                    }
                }
            }
        }
        .onChange(of: viewModel.text) { _ in
            viewModel.handleTextChange()
        }
    }

    private var header: some View {
        HStack(alignment: .top) {
            VStack(alignment: .leading, spacing: 8) {
                Text("Paraphrasing")
                    .font(.system(size: 30, weight: .bold))
                    .foregroundStyle(AppTheme.textPrimary)

                HStack(spacing: 0) {
                    Text("Say it ")
                        .foregroundStyle(AppTheme.textSecondary)
                    Text("differently")
                        .fontWeight(.semibold)
                        .foregroundStyle(AppTheme.teal)
                    Text(". Keep it ")
                        .foregroundStyle(AppTheme.textSecondary)
                    Text("yours")
                        .fontWeight(.semibold)
                        .foregroundStyle(AppTheme.teal)
                    Text(".")
                        .foregroundStyle(AppTheme.textSecondary)
                }
                .font(.system(size: 15))
            }

            Spacer()

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

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

            VStack(alignment: .leading, spacing: 6) {
                ThinCaretTextEditor(
                    text: $viewModel.text,
                    placeholder: "Type or paste your text here and press the paraphrase button...",
                    maxWords: ParaphrasingViewModel.maxWords,
                    onWordLimitReached: viewModel.notifyWordLimitReached
                )
                    .font(.system(size: 14))
                    .foregroundStyle(AppTheme.textPrimary)
                    .frame(maxWidth: .infinity, maxHeight: .infinity)
                    .background(Color.white)
                    .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)
            }
            .frame(maxWidth: .infinity, maxHeight: .infinity)

            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()
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
        .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 outputCard: some View {
        VStack(alignment: .leading, spacing: 12) {
            HStack {
                Text("Paraphrased Text")
                    .font(.system(size: 13, weight: .semibold))
                    .foregroundStyle(AppTheme.textPrimary)

                Spacer()

                ToolbarButton(title: "Copy", iconName: "doc.on.doc") {
                    viewModel.copyParaphrasedText()
                }
            }

            Text(viewModel.paraphrasedText)
                .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)
    }
}