// Origin URL — builds a resolvable URL pointing to a TODO issue in the repo's web UI
// Format varies by host:
//   Bitbucket: <base>/src/<branch>/<path>#<id>
//   GitHub:    <base>/blob/<branch>/<path>#<id>
//   GitLab:    <base>/-/blob/<branch>/<path>#<id>

import { execSync } from "child_process"

export function getGitRemoteUrl(cwd = process.cwd()): string {
  try {
    return execSync("git remote get-url origin", { cwd, encoding: "utf-8" }).trim()
  } catch {
    throw new Error("Could not determine git remote URL. Is this a git repository with an 'origin' remote?")
  }
}

export function getGitBranch(cwd = process.cwd()): string {
  try {
    return execSync("git rev-parse --abbrev-ref HEAD", { cwd, encoding: "utf-8" }).trim()
  } catch {
    return "main"
  }
}

export function normalizeRemoteUrl(url: string): string {
  let normalized = url
  const sshMatch = normalized.match(/^git@([^:]+):(.+?)(?:\.git)?$/)
  if (sshMatch) {
    normalized = `https://${sshMatch[1]}/${sshMatch[2]}`
  }
  normalized = normalized.replace(/\.git$/, "")
  normalized = normalized.replace(/\/+$/, "")
  return normalized
}

function detectHost(url: string): "bitbucket" | "github" | "gitlab" | "unknown" {
  if (url.includes("bitbucket.org")) return "bitbucket"
  if (url.includes("github.com")) return "github"
  if (url.includes("gitlab.com") || url.includes("gitlab")) return "gitlab"
  return "unknown"
}

export function buildOriginUrl(
  remoteUrl: string,
  branch: string,
  todoPath: string,
  issueId: number
): string {
  const base = normalizeRemoteUrl(remoteUrl)
  const host = detectHost(base)

  switch (host) {
    case "github":
      return `${base}/blob/${branch}/${todoPath}#${issueId}`
    case "gitlab":
      return `${base}/-/blob/${branch}/${todoPath}#${issueId}`
    case "bitbucket":
    default:
      return `${base}/src/${branch}/${todoPath}#${issueId}`
  }
}

export function buildCommitUrl(remoteUrl: string, commitHash: string): string {
  const base = normalizeRemoteUrl(remoteUrl)
  const host = detectHost(base)

  switch (host) {
    case "github":
      return `${base}/commit/${commitHash}`
    case "gitlab":
      return `${base}/-/commit/${commitHash}`
    case "bitbucket":
    default:
      return `${base}/commits/${commitHash}`
  }
}

export function shortHash(hash: string): string {
  return hash.slice(0, 7)
}