export interface CapturePayload {
  title: string
  url: string
  selection: string
}

// Limits for capture payloads
const MAX_TITLE_LENGTH = 500
const MAX_URL_LENGTH = 2000
const MAX_SELECTION_LENGTH = 10000

export interface CaptureValidationResult {
  valid: boolean
  errors: string[]
}

export function validateCapturePayload(payload: CapturePayload): CaptureValidationResult {
  const errors: string[] = []

  if (!payload.title || typeof payload.title !== 'string') {
    errors.push('Title is required')
  } else if (payload.title.length > MAX_TITLE_LENGTH) {
    errors.push(`Title too long: ${payload.title.length} chars (max: ${MAX_TITLE_LENGTH})`)
  }

  if (payload.url && typeof payload.url !== 'string') {
    errors.push('URL must be a string')
  } else if (payload.url && payload.url.length > MAX_URL_LENGTH) {
    errors.push(`URL too long: ${payload.url.length} chars (max: ${MAX_URL_LENGTH})`)
  }

  if (payload.selection && typeof payload.selection !== 'string') {
    errors.push('Selection must be a string')
  } else if (payload.selection && payload.selection.length > MAX_SELECTION_LENGTH) {
    errors.push(`Selection too long: ${payload.selection.length} chars (max: ${MAX_SELECTION_LENGTH})`)
  }

  return {
    valid: errors.length === 0,
    errors,
  }
}

export function encodeCapturePayload(payload: CapturePayload): string {
  const params = new URLSearchParams({
    title: payload.title.slice(0, MAX_TITLE_LENGTH),
    url: payload.url.slice(0, MAX_URL_LENGTH),
    selection: payload.selection.slice(0, MAX_SELECTION_LENGTH),
  })
  return params.toString()
}

export function generateBookmarklet(): string {
  // Get the current origin (where the app is running)
  const origin = typeof window !== 'undefined' ? window.location.origin : ''

  const code = `
    var title = document.title;
    var url = location.href;
    var selection = window.getSelection().toString();
    var params = new URLSearchParams({title, url, selection});
    var base = ${JSON.stringify(origin)};
    window.open(base + '/capture?' + params.toString(), '_blank');
  `.replace(/\s+/g, ' ').trim()
  return `javascript:${code}`
}