//
//  DocumentView.swift
//  GeminiRenderer
//
//  Created by Shadowfacts on 7/12/20.
//

import SwiftUI
import GeminiFormat

public struct DocumentView: View {
    private let document: Document
    private let blocks: [RenderingBlock]
    private let changeURL: ((URL) -> Void)?
    private let scrollingEnabled: Bool
    
    public init(document: Document, scrollingEnabled: Bool = true, changeURL: ((URL) -> Void)? = nil) {
        self.document = document
        self.blocks = document.renderingBlocks
        self.changeURL = changeURL
        self.scrollingEnabled = scrollingEnabled
    }
    
    @ViewBuilder
    public var body: some View {
        if scrollingEnabled {
            ScrollView(.vertical) {
                scrollBody
            }
        } else {
            scrollBody
        }
    }
    
    private var scrollBody: some View {
        MaybeLazyVStack(alignment: .leading) {
            ForEach(blocks.indices) { (index) in
                RenderingBlockView(document: document, block: blocks[index], changeURL: changeURL)
            }
        }.padding([.leading, .trailing, .bottom])
    }
}

struct DocumentView_Previews: PreviewProvider {
    static var doc: Document {
        Document(url: URL(string: "gemini://example.com")!, lines: [
            .heading("Hello World", level: .h1),
            .text("Some text"),
            .preformattedToggle(alt: "blah"),
            .preformattedText("test"),
            .preformattedToggle(alt: nil),
            .quote("whatever"),
            .unorderedListItem("something")
        ])
    }
    static var previews: some View {
        DocumentView(document: doc)
    }
}