/**
 *  Copyright (c) 2021 GraphQL Contributors
 *  All rights reserved.
 *
 *  This source code is licensed under the license found in the
 *  LICENSE file in the root directory of this source tree.
 *
 *  @flow
 */

import type { GraphQLSchema } from 'graphql';
import type {
  ASTNode,
  DocumentNode,
  FragmentDefinitionNode,
  NamedTypeNode,
  TypeDefinitionNode,
} from 'graphql/language';
import type { ValidationContext } from 'graphql/validation';
import type {
  GraphQLArgument,
  GraphQLEnumValue,
  GraphQLField,
  GraphQLInputField,
  GraphQLType,
} from 'graphql/type/definition';
import type { GraphQLDirective } from 'graphql/type/directives';

export type { GraphQLConfig, GraphQLProjectConfig } from 'graphql-config';
import type { GraphQLConfig, GraphQLProjectConfig } from 'graphql-config';

export type TokenPattern = string | ((char: string) => boolean) | RegExp;

export interface CharacterStream {
  getStartOfToken: () => number;
  getCurrentPosition: () => number;
  eol: () => boolean;
  sol: () => boolean;
  peek: () => string | null;
  next: () => string;
  eat: (pattern: TokenPattern) => string | void;
  eatWhile: (match: TokenPattern) => boolean;
  eatSpace: () => boolean;
  skipToEnd: () => void;
  skipTo: (position: number) => void;
  match: (
    pattern: TokenPattern,
    consume: ?boolean,
    caseFold: ?boolean,
  ) => Array<string> | boolean;
  backUp: (num: number) => void;
  column: () => number;
  indentation: () => number;
  current: () => string;
}

// Cache and config-related.
export type GraphQLConfiguration = GraphQLProjectConfiguration & {
  projects?: {
    [projectName: string]: GraphQLProjectConfiguration,
  },
};

export type GraphQLProjectConfiguration = {
  // The name for this project configuration.
  // If not supplied, the object key can be used for the project name.
  name?: string,
  schemaPath?: string, // a file with schema IDL

  // For multiple applications with overlapping files,
  // these configuration options may be helpful
  includes?: Array<string>,
  excludes?: Array<string>,

  // If you'd like to specify any other configurations,
  // we provide a reserved namespace for it
  extensions?: GraphQLConfigurationExtension,
};

export type GraphQLConfigurationExtension = {
  [name: string]: mixed,
};

export interface GraphQLCache {
  getGraphQLConfig: () => GraphQLConfig;

  getObjectTypeDependencies: (
    query: string,
    fragmentDefinitions: ?Map<string, ObjectTypeInfo>,
  ) => Promise<Array<ObjectTypeInfo>>;

  getObjectTypeDependenciesForAST: (
    parsedQuery: ASTNode,
    fragmentDefinitions: Map<string, ObjectTypeInfo>,
  ) => Promise<Array<ObjectTypeInfo>>;

  getObjectTypeDefinitions: (
    graphQLConfig: GraphQLProjectConfig,
  ) => Promise<Map<string, ObjectTypeInfo>>;

  +updateObjectTypeDefinition: (
    rootDir: Uri,
    filePath: Uri,
    contents: Array<CachedContent>,
  ) => Promise<void>;

  +updateObjectTypeDefinitionCache: (
    rootDir: Uri,
    filePath: Uri,
    exists: boolean,
  ) => Promise<void>;

  getFragmentDependencies: (
    query: string,
    fragmentDefinitions: ?Map<string, FragmentInfo>,
  ) => Promise<Array<FragmentInfo>>;

  getFragmentDependenciesForAST: (
    parsedQuery: ASTNode,
    fragmentDefinitions: Map<string, FragmentInfo>,
  ) => Promise<Array<FragmentInfo>>;

  getFragmentDefinitions: (
    graphQLConfig: GraphQLProjectConfig,
  ) => Promise<Map<string, FragmentInfo>>;

  +updateFragmentDefinition: (
    rootDir: Uri,
    filePath: Uri,
    contents: Array<CachedContent>,
  ) => Promise<void>;

  +updateFragmentDefinitionCache: (
    rootDir: Uri,
    filePath: Uri,
    exists: boolean,
  ) => Promise<void>;

  getSchema: (
    appName: ?string,
    queryHasExtensions?: ?boolean,
  ) => Promise<?GraphQLSchema>;

  handleWatchmanSubscribeEvent: (
    rootDir: string,
    projectConfig: GraphQLProjectConfig,
  ) => (result: Object) => void;
}

// online-parser related
export interface IPosition {
  line: number;
  character: number;
  lessThanOrEqualTo: (position: IPosition) => boolean;
}

export interface IRange {
  start: IPosition;
  end: IPosition;
  containsPosition: (position: IPosition) => boolean;
}

export type CachedContent = {
  query: string,
  range: ?Range,
};

export type ParseRule =
  | ((token: Token, stream: CharacterStream) => ?string)
  | Array<Rule | string>;

export type Token = {
  kind: string,
  value: string,
};

export type Rule = {
  style?: string,
  match?: (token: Token) => boolean,
  update?: (state: State, token: Token) => void,
  separator?: string | Rule,
  isList?: boolean,
  ofRule?: Rule | string,
};

export type State = {
  level: number,
  levels?: Array<number>,
  prevState: ?State,
  rule: ?ParseRule,
  kind: ?string,
  name: ?string,
  type: ?string,
  step: number,
  needsSeperator: boolean,
  needsAdvance?: boolean,
  indentLevel?: number,
};

// GraphQL Language Service related types
export type Uri = string;

export type GraphQLFileMetadata = {
  filePath: Uri,
  size: number,
  mtime: number,
};

export type GraphQLFileInfo = {
  filePath: Uri,
  content: string,
  asts: Array<DocumentNode>,
  size: number,
  mtime: number,
};

export type ContextToken = {
  start: number,
  end: number,
  string: string,
  state: State,
  style: string,
};

export type ContextTokenForCodeMirror = {
  start: number,
  end: number,
  string: string,
  type: string | null,
  state: State,
};

export type ContextTokenUnion = ContextToken | ContextTokenForCodeMirror;

export type TypeInfo = {
  type: ?GraphQLType,
  parentType: ?GraphQLType,
  inputType: ?GraphQLType,
  directiveDef: ?GraphQLDirective,
  fieldDef: ?GraphQLField<*, *>,
  enumValue: ?GraphQLEnumValue,
  argDef: ?GraphQLArgument,
  argDefs: ?Array<GraphQLArgument>,
  objectFieldDefs: ?GraphQLInputField,
};

export type FragmentInfo = {
  filePath?: Uri,
  content: string,
  definition: FragmentDefinitionNode,
};

export type NamedTypeInfo = {
  filePath?: Uri,
  content: string,
  definition: NamedTypeNode,
};

export type ObjectTypeInfo = {
  filePath?: Uri,
  content: string,
  definition: TypeDefinitionNode,
};

export type Diagnostic = {
  range: Range,
  severity?: number,
  code?: number | string,
  source?: string,
  message: string,
};

export type CompletionItem = {
  label: string,
  kind?: number,
  detail?: string,
  documentation?: ?string,
  // GraphQL Deprecation information
  isDeprecated?: ?boolean,
  deprecationReason?: ?string,
  type?: GraphQLType
};

export type CompletionItemBase = {
  label: string,
  isDeprecated?: boolean,
};

export type CompletionItemForCodeMirror = {
  label: string,
  type?: GraphQLType,
  documentation?: ?string,
  isDeprecated?: boolean,
  deprecationReason?: ?string,
};

// Below are basically a copy-paste from Nuclide rpc types for definitions.

// Definitions/hyperlink
export type Definition = {
  path: Uri,
  position: Position,
  range?: Range,
  id?: string,
  name?: string,
  language: string,
  projectRoot?: Uri,
};
export type DefinitionQueryResult = {
  queryRange: Array<Range>,
  definitions: Array<Definition>,
};

// Outline view
export type TokenKind =
  | 'keyword'
  | 'class-name'
  | 'constructor'
  | 'method'
  | 'param'
  | 'string'
  | 'whitespace'
  | 'plain'
  | 'type';
export type TextToken = {
  kind: TokenKind,
  value: string,
};
export type TokenizedText = Array<TextToken>;
export type OutlineTree = {
  // Must be one or the other. If both are present, tokenizedText is preferred.
  plainText?: string,
  tokenizedText?: TokenizedText,
  representativeName?: string,

  startPosition: Position,
  endPosition?: Position,
  children: Array<OutlineTree>,
};
export type Outline = {
  outlineTrees: Array<OutlineTree>,
};

export interface DidChangeWatchedFilesParams {
  changes: FileEvent[];
}
export interface FileEvent {
  uri: string;
  type: FileChangeType;
}
export const FileChangeTypeKind = {
  Created: 1,
  Changed: 2,
  Deleted: 3,
};
export type FileChangeType = $Values<typeof FileChangeTypeKind>;