import {
  IssueReadModel,
  ProjectWorkflow,
  ReleaseReadModel,
  StatusCategory,
} from '@task-stream/api/tracker/domain';

/** How the default types are told in release notes; others use their name. */
const HEADING: Record<string, string> = {
  FEATURE: 'Novedades',
  UI_CHANGE: 'Cambios en la interfaz',
  BUG: 'Correcciones',
  TASK: 'Mejoras internas',
};
/** Verification work is not news for whoever reads the notes. */
const LEFT_OUT = new Set(['QA']);

/**
 * A first draft of a release's notes, in Markdown: its finished tickets
 * grouped by type (in the project's order of types), newest version header
 * first. Someone edits it before publishing it; it is never saved by itself.
 */
export function draftReleaseNotes(input: {
  release: ReleaseReadModel;
  issues: IssueReadModel[];
  workflow: ProjectWorkflow;
}): string {
  const { release, issues, workflow } = input;
  const done = issues.filter(
    (i) => i.statusCategory === StatusCategory.DONE && !LEFT_OUT.has(i.type),
  );
  const day = release.releasedAt ?? release.targetDate;
  const date = day
    ? ` — ${new Date(day).toLocaleDateString('es', {
        day: 'numeric',
        month: 'long',
        year: 'numeric',
        timeZone: 'UTC',
      })}`
    : '';
  const lines = [`## ${release.name}${date}`];
  if (release.description) lines.push('', release.description);
  const order = workflow.settings.issueTypes.map((t) => t.id);
  const types = [...new Set(done.map((i) => i.type))].sort(
    (a, b) =>
      (order.indexOf(a) + 1 || order.length + 1) -
      (order.indexOf(b) + 1 || order.length + 1),
  );
  for (const type of types) {
    lines.push('', `### ${HEADING[type] ?? workflow.typeName(type)}`, '');
    for (const issue of done
      .filter((i) => i.type === type)
      .sort((a, b) => a.number - b.number))
      lines.push(`- ${issue.title} (${issue.key})`);
  }
  if (!done.length)
    lines.push('', '_Aún no hay tickets terminados en esta release._');
  return lines.join('\n') + '\n';
}