import type { PlaceholderMapping, VelumSession } from "./types";

export const NEW_SESSION_ID = "__new_session__";

export function markdownCodeBlock(value: string): string {
  return `\`\`\`text\n${value.replace(/```/g, "`\u200b``")}\n\`\`\``;
}

function escapeMarkdownTableCell(value: string): string {
  return value.replace(/\|/g, "\\|").replace(/\r?\n/g, " ");
}

export function mappingDetailTable(mapping: PlaceholderMapping): string {
  const rows = Object.entries(mapping)
    .sort(([a], [b]) => a.localeCompare(b))
    .map(
      ([placeholder, entry]) =>
        `| \`${placeholder}\` | ${escapeMarkdownTableCell(entry.original)} | ${entry.type} |`,
    );

  if (rows.length === 0) {
    return "Keine Einträge.";
  }

  return [
    "| Platzhalter | Original | Typ |",
    "| --- | --- | --- |",
    ...rows,
  ].join("\n");
}

export function mappingSummary(mapping: PlaceholderMapping): string {
  const counts = Object.values(mapping).reduce<Record<string, number>>(
    (acc, entry) => {
      acc[entry.type] = (acc[entry.type] ?? 0) + 1;
      return acc;
    },
    {},
  );

  const rows = Object.entries(counts)
    .sort(([a], [b]) => a.localeCompare(b))
    .map(([type, count]) => `| ${type} | ${count} |`);

  if (rows.length === 0) {
    return "Keine Einträge.";
  }

  return ["| Typ | Anzahl |", "| --- | ---: |", ...rows].join("\n");
}

export function sessionSubtitle(session: VelumSession): string {
  const entries = Object.keys(session.mapping).length;
  return `${entries} ${entries === 1 ? "Zuordnung" : "Zuordnungen"} · aktualisiert ${new Date(
    session.updatedAt,
  ).toLocaleString()}`;
}