// The transparency log's lines in the Trust view (spec §5.12): what
// `oxy tlog verify --json` proved, who cosigned it, or why it failed. No
// vscode imports, so it is tested with plain Node.

import { TlogInfo } from "./oxy";

/** The last check of a repository's hub log: its result or its error. */
export type TlogCheck = { info: TlogInfo; when_ms: number } | { error: string; when_ms: number };

export interface TlogLine {
  label: string;
  description?: string;
  tooltip?: string;
  icon: string;
}

/** The Trust view's lines for a log check; `ago` words a time (milliseconds since the epoch). */
export function tlogLines(check: TlogCheck | undefined, ago: (ms: number) => string): TlogLine[] {
  if (!check) {
    return [{ label: "Transparency log not checked", description: "click to verify the hub's log", icon: "shield", tooltip: "Runs oxy tlog verify: checks that the hub shows everyone the same history." }];
  }
  if ("error" in check) {
    const first = check.error.trim().split("\n")[0] || "oxy tlog verify failed";
    return [{ label: "Transparency log NOT verified", description: first, icon: "error", tooltip: check.error.trim() }];
  }
  const { info } = check;
  const mine = info.entries.length;
  const lines: TlogLine[] = [
    {
      label: `Transparency log verified up to checkpoint ${info.size}`,
      description: `${info.origin} · ${mine} entr${mine === 1 ? "y" : "ies"} for this repository · ${ago(check.when_ms)}`,
      icon: "verified",
      tooltip: `${info.hub}\nRoot ${info.root}\nEvery entry checks against the root its log key signed, and the log extends what you saw before.`,
    },
  ];
  if (info.witnesses.length === 0) {
    lines.push({ label: "Cosigned by no witness you trust", icon: "warning", tooltip: "Without a witness, only your own past checks show the hub has not forked its log." });
  } else {
    for (const w of info.witnesses) {
      lines.push({ label: `Cosigned by ${w.name}`, description: ago(w.time_ms), icon: "key" });
    }
  }
  return lines;
}