const bugBaseUrl = 'https://github.com/cloud-copilot/iam-shrink/issues/new'

/**
 * The title of the bug report
 * @param errorMatch The undesired match
 * @returns the title of the bug report
 */
function bugTitle(errorMatch: string) {
  return `Bug: ShrinkValidationError. ${errorMatch}`
}

/**
 * The body of the bug report
 *
 * @param errorMatch The undesired match
 * @param desiredPatterns The desired patterns
 * @param excludedPatterns The excluded patterns
 * @returns the body of the bug report
 */
function bugBody(errorMatch: string, desiredPatterns: string[]) {
  return `${errorMatch} while shrinking patterns ${JSON.stringify(desiredPatterns)}`
}

/**
 * Get the full url of the full bug report
 *
 * @param desiredPatterns The desired patterns
 * @param excludedPatterns The excluded patterns
 * @param errorMatch The undesired match that caused the bug
 * @returns the full url to create a new bug report
 */
function bugUrl(desiredPatterns: string[], errorMatch: string) {
  return `${bugBaseUrl}?labels=bug&title=${encodeURIComponent(bugTitle(errorMatch))}&body=${encodeURIComponent(bugBody(errorMatch, desiredPatterns))}`
}

export class ShrinkValidationError extends Error {
  /**
   * Capture a validation error from a shrink operation
   *
   * @param desiredPatterns the patterns the user wanted to shrink
   * @param excludedPatterns the patterns the user wanted to exclude
   * @param errorMatch the undesired match that triggered the bug
   */
  constructor(
    public readonly desiredPatterns: string[],
    public readonly errorMatch: string
  ) {
    super(
      [
        `@cloud-copilot/iam-shrink has failed validation and this is a bug.`,
        `Please file a bug at ${bugUrl(desiredPatterns, errorMatch)}`
      ].join('\n')
    )
    this.name = 'ShrinkValidationError' // Set the name of the error
  }
}