/**
 * Forgejo-specific comment URL formatting and body construction.
 *
 * Contains Forgejo-specific helpers for:
 *   - Unicode spinner instead of GitHub CDN image (CDN URLs don't resolve on Forgejo)
 *   - PR compare URL with `expand=1` instead of GitHub's `quick_pull=1`
 *   - Forgejo run index (GITHUB_RUN_NUMBER vs GITHUB_RUN_ID)
 *
 * The final comment body logic (updateCommentBody) is unified in
 * src/github/operations/comment-logic.ts and works for both platforms.
 */

import { getServerUrl } from "../github/api/config";

// ---------------------------------------------------------------------------
// Run index helper
// ---------------------------------------------------------------------------

/**
 * Get the run identifier for Forgejo URLs.
 *
 * Forgejo uses the per-repo sequential run index in URLs (`/actions/runs/{index}`),
 * not the internal database run ID. The Forgejo runner sets:
 *   - GITHUB_RUN_ID     = internal DB primary key (e.g. 11943)
 *   - GITHUB_RUN_NUMBER = per-repo sequential index (e.g. 661)
 *
 * GitHub uses GITHUB_RUN_ID in URLs, but Forgejo uses GITHUB_RUN_NUMBER.
 */
export function getForgejoRunIndex(): string {
  return process.env.GITHUB_RUN_NUMBER || process.env.GITHUB_RUN_ID || "0";
}

// ---------------------------------------------------------------------------
// Spinner
// ---------------------------------------------------------------------------

/**
 * Unicode spinner for Forgejo comments.
 * The GitHub version uses a CDN-hosted animated GIF that won't load on Forgejo.
 */
export const FORGEJO_SPINNER_HTML = "⏳";

// ---------------------------------------------------------------------------
// URL Builders
// ---------------------------------------------------------------------------

// Note: owner, repo, runId, and branchName are NOT URI-encoded in path
// segments because: (1) owner/repo are validated by Forgejo (alphanumeric +
// .-_), (2) branchName is validated by validateBranchName() which restricts
// to [a-zA-Z0-9._/-], and (3) encoding "/" in branch names breaks Forgejo
// URLs (e.g., "claude/fix-bug" → "claude%2Ffix-bug" is invalid).

export function createForgejoJobRunLink(
  owner: string,
  repo: string,
  runId: string,
): string {
  const jobRunUrl = `${getServerUrl()}/${owner}/${repo}/actions/runs/${runId}`;
  return `[View job run](${jobRunUrl})`;
}

export function createForgejoBranchLink(
  owner: string,
  repo: string,
  branchName: string,
): string {
  const branchUrl = `${getServerUrl()}/${owner}/${repo}/tree/${branchName}`;
  return `\n[View branch](${branchUrl})`;
}

/**
 * Build a Forgejo PR compare URL for "Create a PR" links.
 *
 * Forgejo's compare page pre-fills title/body from query params but does not
 * support GitHub's `quick_pull=1` parameter.
 */
export function createForgejoPrCompareUrl(
  serverUrl: string,
  owner: string,
  repo: string,
  baseBranch: string,
  headBranch: string,
  title: string,
  body: string,
): string {
  const prTitle = encodeURIComponent(title);
  const prBody = encodeURIComponent(body);
  return `${serverUrl}/${owner}/${repo}/compare/${baseBranch}...${headBranch}?expand=1&title=${prTitle}&body=${prBody}`;
}

// ---------------------------------------------------------------------------
// Initial comment body (shown while Claude is working)
// ---------------------------------------------------------------------------

export function createForgejoCommentBody(
  jobRunLink: string,
  branchLink: string = "",
): string {
  return `Claude Code is working… ${FORGEJO_SPINNER_HTML}

I'll analyze this and get back to you.

${jobRunLink}${branchLink}`;
}