import type { SourceMap } from 'magic-string';
export { CompileError } from './utils/error';

export interface BaseNode {
  start: number;
  end: number;
  type: string;
  children?: TemplateNode[];
  [prop_name: string]: any;
}

export interface Fragment extends BaseNode {
  type: 'Fragment';
  children: TemplateNode[];
}

export interface Text extends BaseNode {
  type: 'Text';
  data: string;
  raw: string;
}

export interface CodeFence extends BaseNode {
  type: 'CodeFence';
  metadata: string;
  data: string;
  raw: string;
}

export interface CodeSpan extends BaseNode {
  type: 'CodeFence';
  metadata: string;
  data: string;
  raw: string;
}

export interface Attribute extends BaseNode {
  type: 'Attribute';
  name: string;
  value: Text[];
}

export interface MustacheTag extends BaseNode {
  type: 'MustacheTag';
  content: string;
}

export type DirectiveType = 'Action' | 'Animation' | 'Binding' | 'Class' | 'EventHandler' | 'Let' | 'Ref' | 'Transition';

interface BaseDirective extends BaseNode {
  type: DirectiveType;
  expression: null | Node;
  name: string;
  modifiers: string[];
}

export interface Transition extends BaseDirective {
  type: 'Transition';
  intro: boolean;
  outro: boolean;
}

export type Directive = BaseDirective | Transition;

export type TemplateNode = Text | CodeSpan | CodeFence | MustacheTag | BaseNode | Directive | Transition;

export interface Expression {
  type: 'Expression';
  start: number;
  end: number;
  codeChunks: string[];
  children: BaseNode[];
}

export interface Parser {
  readonly template: string;
  readonly filename?: string;

  index: number;
  stack: Node[];

  html: Node;
  css: Node;
  js: Node;
  meta_tags: Map<string, string>;
}

export interface Script extends BaseNode {
  type: 'Script';
  context: 'runtime' | 'setup';
  content: string;
}

export interface Style extends BaseNode {
  type: 'Style';
  attributes: any[]; // TODO
  content: {
    start: number;
    end: number;
    styles: string;
  };
}

export interface Ast {
  html: TemplateNode;
  css: Style[];
  module: Script;
  // instance: Script;
  meta: {
    features: number;
  };
}

export interface Warning {
  start?: { line: number; column: number; pos?: number };
  end?: { line: number; column: number };
  pos?: number;
  code: string;
  message: string;
  filename?: string;
  frame?: string;
  toString: () => string;
}

export type ModuleFormat = 'esm' | 'cjs';

export type CssHashGetter = (args: { name: string; filename: string | undefined; css: string; hash: (input: string) => string }) => string;

export interface Visitor {
  enter: (node: Node) => void;
  leave?: (node: Node) => void;
}

export interface AppendTarget {
  slots: Record<string, string>;
  slot_stack: string[];
}

export interface Var {
  name: string;
  export_name?: string; // the `bar` in `export { foo as bar }`
  injected?: boolean;
  module?: boolean;
  mutated?: boolean;
  reassigned?: boolean;
  referenced?: boolean; // referenced from template scope
  referenced_from_script?: boolean; // referenced from script
  writable?: boolean;

  // used internally, but not exposed
  global?: boolean;
  internal?: boolean; // event handlers, bindings
  initialised?: boolean;
  hoistable?: boolean;
  subscribable?: boolean;
  is_reactive_dependency?: boolean;
  imported?: boolean;
}

export interface CssResult {
  code: string;
  map: SourceMap;
}