/**
 * @typedef {import('unist').Node} Node
 * @typedef {import('unist').Position} Position
 * @typedef {import('unist').Point} Point
 * @typedef {object & {type: string, position?: Position | undefined}} NodeLike
 */

import {stringifyPosition} from 'unist-util-stringify-position'

/**
 * Message.
 */
export class VFileMessage extends Error {
  /**
   * Create a message for `reason` at `place` from `origin`.
   *
   * When an error is passed in as `reason`, the `stack` is copied.
   *
   * @param {string | Error | VFileMessage} reason
   *   Reason for message, uses the stack and message of the error if given.
   *
   *   > 👉 **Note**: you should use markdown.
   * @param {Node | NodeLike | Position | Point | null | undefined} [place]
   *   Place in file where the message occurred.
   * @param {string | null | undefined} [origin]
   *   Place in code where the message originates (example:
   *   `'my-package:my-rule'` or `'my-rule'`).
   * @returns
   *   Instance of `VFileMessage`.
   */
  // To do: next major: expose `undefined` everywhere instead of `null`.
  constructor(reason, place, origin) {
    /** @type {[string | null, string | null]} */
    const parts = [null, null]
    /** @type {Position} */
    let position = {
      // @ts-expect-error: we always follows the structure of `position`.
      start: {line: null, column: null},
      // @ts-expect-error: "
      end: {line: null, column: null}
    }

    super()

    if (typeof place === 'string') {
      origin = place
      place = undefined
    }

    if (typeof origin === 'string') {
      const index = origin.indexOf(':')

      if (index === -1) {
        parts[1] = origin
      } else {
        parts[0] = origin.slice(0, index)
        parts[1] = origin.slice(index + 1)
      }
    }

    if (place) {
      // Node.
      if ('type' in place || 'position' in place) {
        if (place.position) {
          // To do: next major: deep clone.
          // @ts-expect-error: looks like a position.
          position = place.position
        }
      }
      // Position.
      else if ('start' in place || 'end' in place) {
        // @ts-expect-error: looks like a position.
        // To do: next major: deep clone.
        position = place
      }
      // Point.
      else if ('line' in place || 'column' in place) {
        // To do: next major: deep clone.
        position.start = place
      }
    }

    // Fields from `Error`.
    /**
     * Serialized positional info of error.
     *
     * On normal errors, this would be something like `ParseError`, buit in
     * `VFile` messages we use this space to show where an error happened.
     */
    this.name = stringifyPosition(place) || '1:1'

    /**
     * Reason for message.
     *
     * @type {string}
     */
    this.message = typeof reason === 'object' ? reason.message : reason

    /**
     * Stack of message.
     *
     * This is used by normal errors to show where something happened in
     * programming code, irrelevant for `VFile` messages,
     *
     * @type {string}
     */
    this.stack = ''

    if (typeof reason === 'object' && reason.stack) {
      this.stack = reason.stack
    }

    /**
     * Reason for message.
     *
     * > 👉 **Note**: you should use markdown.
     *
     * @type {string}
     */
    this.reason = this.message

    /* eslint-disable no-unused-expressions */
    /**
     * State of problem.
     *
     * * `true` — marks associated file as no longer processable (error)
     * * `false` — necessitates a (potential) change (warning)
     * * `null | undefined` — for things that might not need changing (info)
     *
     * @type {boolean | null | undefined}
     */
    this.fatal

    /**
     * Starting line of error.
     *
     * @type {number | null}
     */
    this.line = position.start.line

    /**
     * Starting column of error.
     *
     * @type {number | null}
     */
    this.column = position.start.column

    /**
     * Full unist position.
     *
     * @type {Position | null}
     */
    this.position = position

    /**
     * Namespace of message (example: `'my-package'`).
     *
     * @type {string | null}
     */
    this.source = parts[0]

    /**
     * Category of message (example: `'my-rule'`).
     *
     * @type {string | null}
     */
    this.ruleId = parts[1]

    /**
     * Path of a file (used throughout the `VFile` ecosystem).
     *
     * @type {string | null}
     */
    this.file

    // The following fields are “well known”.
    // Not standard.
    // Feel free to add other non-standard fields to your messages.

    /**
     * Specify the source value that’s being reported, which is deemed
     * incorrect.
     *
     * @type {string | null}
     */
    this.actual

    /**
     * Suggest acceptable values that can be used instead of `actual`.
     *
     * @type {Array<string> | null}
     */
    this.expected

    /**
     * Link to docs for the message.
     *
     * > 👉 **Note**: this must be an absolute URL that can be passed as `x`
     * > to `new URL(x)`.
     *
     * @type {string | null}
     */
    this.url

    /**
     * Long form description of the message (you should use markdown).
     *
     * @type {string | null}
     */
    this.note
    /* eslint-enable no-unused-expressions */
  }
}

VFileMessage.prototype.file = ''
VFileMessage.prototype.name = ''
VFileMessage.prototype.reason = ''
VFileMessage.prototype.message = ''
VFileMessage.prototype.stack = ''
VFileMessage.prototype.fatal = null
VFileMessage.prototype.column = null
VFileMessage.prototype.line = null
VFileMessage.prototype.source = null
VFileMessage.prototype.ruleId = null
VFileMessage.prototype.position = null