import Foundation
import OrgSwift
import OrgSwiftUI
import SwiftUI

/// README rendering follows the file's format. Org is rendered natively by the shared
/// `OrgSwiftUI` package; everything else keeps the established Markdown renderer.
struct ReadmeView: View {
    let name: String
    let content: String
    /// Instance host and `owner/repo`, used to resolve repository-relative links and images.
    /// Empty leaves relative references unresolved.
    var host: String = ""
    var repoPath: String = ""

    @Environment(\.colorScheme) private var colorScheme

    /// Format follows the file name, never a guess at the content.
    var isOrg: Bool { name.lowercased().hasSuffix(".org") }

    var body: some View {
        if isOrg {
            // Qualified: `OrgView` here is org-mode, not the organization view.
            OrgSwiftUI.OrgView(
                content,
                options: orgOptions,
                styler: OrgSyntaxStyler(colorScheme: colorScheme),
                // org's TODO/DONE are the same open/done distinction the forge already
                // colors, so they reuse those tokens rather than a third treatment.
                keywords: OrgKeywordStyle(todo: .gbOK, done: .gbDone)
            )
        } else {
            MarkdownView(markdown: content)
        }
    }

    /// gitbay serves raw bytes at `/{owner}/{repo}/raw/{ref}/…` and the file page at
    /// `/blob/…`, so relative images resolve against `raw` and links against `blob`.
    private var orgOptions: OrgRenderOptions {
        let parts = repoPath.split(separator: "/", maxSplits: 1).map(String.init)
        guard parts.count == 2, !host.isEmpty else {
            return OrgRenderOptions()
        }
        return OrgRenderOptions(
            host: host,
            owner: parts[0],
            repositoryName: parts[1],
            ref: "HEAD",
            readmePath: name,
            imagePathSegment: "raw",
            linkPathSegment: "blob"
        )
    }
}