/**
 * APOSTL AST Types
 * Formula parsing and evaluation types for the APOSTL contract language.
 */

export type FormulaNode =
  | { type: 'literal'; value: boolean | number | string | null }
  | { type: 'variable'; name: string; accessor?: string[] | undefined }
  | { type: 'comparison'; op: Comparator; left: FormulaNode; right: FormulaNode }
  | { type: 'boolean'; op: BooleanOperator; left: FormulaNode; right: FormulaNode }
  | { type: 'conditional'; condition: FormulaNode; then: FormulaNode; else: FormulaNode }
  | { type: 'quantified'; quantifier: 'for' | 'exists'; variable: string; collection: OperationCall; body: FormulaNode }
  | { type: 'operation'; header: OperationHeader; parameter: OperationParameter; accessor?: string[] | undefined }
  | { type: 'previous'; inner: FormulaNode }
  | { type: 'status'; code: number }

export type Comparator = '==' | '!=' | '<=' | '>=' | '<' | '>' | 'matches'
export type BooleanOperator = '&&' | '||' | '=>'
export type OperationPathSegment =
  | { type: 'text'; value: string }
  | { type: 'expression'; expression: FormulaNode }
export type OperationHeader =
  | 'request_body'
  | 'response_body'
  | 'response_payload'
  | 'response_code'
  | 'request_headers'
  | 'response_headers'
  | 'query_params'
  | 'cookies'
  | 'response_time'
  | 'request_params'
  | 'redirect_count'
  | 'redirect_url'
  | 'redirect_status'
  | 'timeout_occurred'
  | 'timeout_value'
  | 'request_files'
  | 'request_fields'
  | 'stream_chunks'
  | 'stream_duration'
  | string
export type OperationParameter =
  | { type: 'this' }
  | { type: 'call'; method: 'GET'; path: OperationPathSegment[] }
export type OperationCall = { header: OperationHeader; parameter: OperationParameter; accessor?: string[] | undefined }

export interface ParseResult {
  readonly ast: FormulaNode
  readonly raw: string
}