import SwiftUI
import SwiftData

struct DiaryQuickSheet: View {
    @Environment(\.modelContext) private var ctx
    @Environment(\.dismiss) private var dismiss

    @State private var content: String = ""
    @State private var createdAt: Date = .now

    private var canSubmit: Bool {
        !content.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    }

    var body: some View {
        VStack(spacing: 0) {
            Capsule()
                .fill(Tj.Palette.line)
                .frame(width: 40, height: 4)
                .padding(.top, 10)
                .padding(.bottom, 14)

            HStack {
                Text("写日记")
                    .font(.tjH2())
                    .foregroundStyle(Tj.Palette.text)
                Spacer()
                Text("本机保存")
                    .font(.system(size: 12))
                    .foregroundStyle(Tj.Palette.text3)
            }
            .padding(.horizontal, 20)
            .padding(.bottom, 16)

            VStack(alignment: .leading, spacing: 16) {
                VStack(alignment: .leading, spacing: 8) {
                    sectionLabel("内容")
                    TextField("今天怎么样?", text: $content, axis: .vertical)
                        .lineLimit(4...10)
                        .padding(.horizontal, 14)
                        .padding(.vertical, 12)
                        .background(
                            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
                                .fill(Tj.Palette.paper)
                        )
                        .overlay(
                            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
                                .strokeBorder(Tj.Palette.line, lineWidth: 1)
                        )
                }

                VStack(alignment: .leading, spacing: 8) {
                    sectionLabel("时间")
                    DatePicker("", selection: $createdAt, in: ...Date.now)
                        .datePickerStyle(.compact)
                        .labelsHidden()
                }
            }
            .padding(.horizontal, 20)

            Spacer(minLength: 12)

            HStack(spacing: 12) {
                Button("取消") { dismiss() }
                    .buttonStyle(TjGhostButton(height: 44, fontSize: 15, horizontalPadding: 18))
                Button("保存") { submit() }
                    .buttonStyle(TjPrimaryButton(height: 44, fontSize: 15, horizontalPadding: 18))
                    .disabled(!canSubmit)
                    .opacity(canSubmit ? 1 : 0.4)
            }
            .padding(.horizontal, 20)
            .padding(.vertical, 14)
        }
        .background(
            Tj.Palette.sand
                .clipShape(RoundedRectangle(cornerRadius: Tj.Radius.xl, style: .continuous))
                .ignoresSafeArea(edges: .bottom)
        )
        .presentationDetents([.medium, .large])
        .presentationDragIndicator(.hidden)
        .presentationBackground(Tj.Palette.sand)
        .presentationCornerRadius(Tj.Radius.xl)
    }

    private func sectionLabel(_ text: String) -> some View {
        Text(text)
            .font(.system(size: 12, weight: .semibold))
            .tracking(0.3)
            .foregroundStyle(Tj.Palette.text2)
    }

    private func submit() {
        guard canSubmit else { return }
        let entry = DiaryEntry(
            content: content.trimmingCharacters(in: .whitespacesAndNewlines),
            createdAt: createdAt
        )
        ctx.insert(entry)
        try? ctx.save()
        dismiss()
    }
}