// Type definitions for sql.d.ts 1.4
// Project: https://github.com/sql-js/sql.d.ts
// Definitions by: Florian Imdahl <https://github.com/ffflorian>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.3

// This file has been simplified to not need node or emscrypten

export type SqlValue = number | string | Uint8Array | null;
export type ParamsObject = Record<string, SqlValue>;
export type ParamsCallback = (obj: ParamsObject) => void;
export type BindParams = SqlValue[] | ParamsObject | null;

export interface QueryExecResult {
  columns: string[];
  values: SqlValue[][];
}

export interface StatementIteratorResult {
  /** `true` if there are no more available statements */
  done: boolean;
  /** the next available Statement (as returned by `Database.prepare`) */
  value: Statement;
}

export interface SqlJsStatic {
  Database: typeof Database;
  Statement: typeof Statement;
}

export declare class Database {
  /**
   * Represents an SQLite database
   * @see [https://sql.d.ts.org/documentation/Database.html#Database](https://sql.js.org/documentation/Database.html#Database)
   *
   * @param data An array of bytes representing an SQLite database file
   */
  constructor(data?: ArrayLike<number> | null);

  /**
   * Close the database, and all associated prepared statements. The
   * memory associated to the database and all associated statements will
   * be freed.
   *
   * **Warning**: A statement belonging to a database that has been closed
   * cannot be used anymore.
   *
   * Databases must be closed when you're finished with them, or the
   * memory consumption will grow forever
   * @see [https://sql.d.ts.org/documentation/Database.html#["close"]](https://sql.js.org/documentation/Database.html#%5B%22close%22%5D)
   */
  close(): void;

  /**
   * Register a custom function with SQLite
   * @see [https://sql.d.ts.org/documentation/Database.html#["create_function"]](https://sql.js.org/documentation/Database.html#%5B%22create_function%22%5D)
   *
   * @param name the name of the function as referenced in SQL statements.
   * @param func the actual function to be executed.
   */
  create_function(name: string, func: (...args: any[]) => any): Database;

  /**
   * Execute an sql statement, and call a callback for each row of result.
   *
   * Currently this method is synchronous, it will not return until the
   * callback has been called on every row of the result. But this might
   * change.
   * @see [https://sql.d.ts.org/documentation/Database.html#["each"]](https://sql.js.org/documentation/Database.html#%5B%22each%22%5D)
   *
   * @param sql A string of SQL text. Can contain placeholders that will
   * be bound to the parameters given as the second argument
   * @param params Parameters to bind to the query
   * @param callback Function to call on each row of result
   * @param done A function that will be called when all rows have been
   * retrieved
   */
  each(sql: string, params: BindParams, callback: ParamsCallback, done: () => void): Database;
  each(sql: string, callback: ParamsCallback, done: () => void): Database;

  /**
   * Execute an SQL query, and returns the result.
   *
   * This is a wrapper against `Database.prepare`, `Statement.bind`, `Statement.step`, `Statement.get`, and `Statement.free`.
   *
   * The result is an array of result elements. There are as many result elements as the number of statements in your sql string (statements are separated by a semicolon)
   * @see [https://sql.d.ts.org/documentation/Database.html#["exec"]](https://sql.js.org/documentation/Database.html#%5B%22exec%22%5D)
   *
   * @param sql a string containing some SQL text to execute
   * @param params When the SQL statement contains placeholders, you can
   * pass them in here. They will be bound to the statement before it is
   * executed. If you use the params argument as an array, you **cannot**
   * provide an sql string that contains several statements (separated by
   * `;`). This limitation does not apply to params as an object.
   */
  exec(sql: string, params?: BindParams): QueryExecResult[];

  /**
   * Exports the contents of the database to a binary array
   * @see [https://sql.d.ts.org/documentation/Database.html#["export"]](https://sql.js.org/documentation/Database.html#%5B%22export%22%5D)
   */
  export(): Uint8Array;

  /**
   * Returns the number of changed rows (modified, inserted or deleted) by
   * the latest completed `INSERT`, `UPDATE` or `DELETE` statement on the
   * database. Executing any other type of SQL statement does not modify
   * the value returned by this function.
   * @see [https://sql.d.ts.org/documentation/Database.html#["getRowsModified"]](https://sql.js.org/documentation/Database.html#%5B%22getRowsModified%22%5D)
   */
  getRowsModified(): number;

  /**
   * Analyze a result code, return null if no error occured, and throw an
   * error with a descriptive message otherwise
   * @see [https://sql.d.ts.org/documentation/Database.html#["handleError"]](https://sql.js.org/documentation/Database.html#%5B%22handleError%22%5D)
   */
  handleError(): null | never;

  /**
   * Iterate over multiple SQL statements in a SQL string. This function
   * returns an iterator over Statement objects. You can use a `for..of`
   * loop to execute the returned statements one by one.
   * @see [https://sql.d.ts.org/documentation/Database.html#["iterateStatements"]](https://sql.js.org/documentation/Database.html#%5B%22iterateStatements%22%5D)
   *
   * @param sql a string of SQL that can contain multiple statements
   */
  iterateStatements(sql: string): StatementIterator;

  /**
   * Prepare an SQL statement
   * @see [https://sql.d.ts.org/documentation/Database.html#["prepare"]](https://sql.js.org/documentation/Database.html#%5B%22prepare%22%5D)
   *
   * @param sql a string of SQL, that can contain placeholders (`?`, `:VVV`, `:AAA`, `@AAA`)
   * @param params values to bind to placeholders
   */
  prepare(sql: string, params?: BindParams): Statement;

  /**
   * Execute an SQL query, ignoring the rows it returns.
   * @see [https://sql.d.ts.org/documentation/Database.html#["run"]](https://sql.js.org/documentation/Database.html#%5B%22run%22%5D)
   *
   * @param sql a string containing some SQL text to execute
   * @param params When the SQL statement contains placeholders, you can
   * pass them in here. They will be bound to the statement before it is
   * executed. If you use the params argument as an array, you **cannot**
   * provide an sql string that contains several statements (separated by
   * `;`). This limitation does not apply to params as an object.
   */
  run(sql: string, params?: BindParams): Database;
}

export declare class Statement {
  /**
   * Bind values to the parameters, after having reseted the statement. If
   * values is null, do nothing and return true.
   *
   * SQL statements can have parameters, named '?', '?NNN', ':VVV',
   * '@VVV', '$VVV', where NNN is a number and VVV a string. This function
   * binds these parameters to the given values.
   *
   * Warning: ':', '@', and '$' are included in the parameters names
   *
   * ### Value types
   *
   * |Javascript type|SQLite type|
   * |-|-|
   * |number|REAL, INTEGER|
   * |boolean|INTEGER|
   * |string|TEXT|
   * |Array, Uint8Array|BLOB|
   * |null|NULL|
   * @see [https://sql.d.ts.org/documentation/Statement.html#["bind"]](https://sql.js.org/documentation/Statement.html#%5B%22bind%22%5D)
   *
   * @param values The values to bind
   */
  bind(values?: BindParams): boolean;

  /**
   * Free the memory used by the statement
   * @see [https://sql.d.ts.org/documentation/Statement.html#["free"]](https://sql.js.org/documentation/Statement.html#%5B%22free%22%5D)
   */
  free(): boolean;

  /**
   * Free the memory allocated during parameter binding
   * @see [https://sql.d.ts.org/documentation/Statement.html#["freemem"]](https://sql.js.org/documentation/Statement.html#%5B%22freemem%22%5D)
   */
  freemem(): void;

  /**
   * Get one row of results of a statement. If the first parameter is not
   * provided, step must have been called before.
   * @see [https://sql.d.ts.org/documentation/Statement.html#["get"]](https://sql.js.org/documentation/Statement.html#%5B%22get%22%5D)
   *
   * @param params If set, the values will be bound to the statement
   * before it is executed
   */
  get(params?: BindParams): SqlValue[];

  /**
   * Get one row of result as a javascript object, associating column
   * names with their value in the current row
   * @see [https://sql.d.ts.org/documentation/Statement.html#["getAsObject"]](https://sql.js.org/documentation/Statement.html#%5B%22getAsObject%22%5D)
   *
   * @param params If set, the values will be bound to the statement, and
   * it will be executed
   */
  getAsObject(params?: BindParams): ParamsObject;

  /**
   * Get the list of column names of a row of result of a statement.
   * @see [https://sql.d.ts.org/documentation/Statement.html#["getColumnNames"]](https://sql.js.org/documentation/Statement.html#%5B%22getColumnNames%22%5D)
   */
  getColumnNames(): string[];

  /**
   * Get the SQLite's normalized version of the SQL string used in
   * preparing this statement. The meaning of "normalized" is not
   * well-defined: see
   * [the SQLite documentation](https://sqlite.org/c3ref/expanded_sql.html).
   * @see [https://sql.d.ts.org/documentation/Statement.html#["getNormalizedSQL"]](https://sql.js.org/documentation/Statement.html#%5B%22getNormalizedSQL%22%5D)
   */
  getNormalizedSQL(): string;

  /**
   * Get the SQL string used in preparing this statement.
   * @see [https://sql.d.ts.org/documentation/Statement.html#["getSQL"]](https://sql.js.org/documentation/Statement.html#%5B%22getSQL%22%5D)
   */
  getSQL(): string;

  /**
   * Reset a statement, so that it's parameters can be bound to new
   * values. It also clears all previous bindings, freeing the memory used
   * by bound parameters.
   * @see [https://sql.d.ts.org/documentation/Statement.html#["reset"]](https://sql.js.org/documentation/Statement.html#%5B%22reset%22%5D)
   */
  reset(): void;

  /**
   * Shorthand for bind + step + reset Bind the values, execute the
   * statement, ignoring the rows it returns, and resets it
   * @param values Value to bind to the statement
   */
  run(values?: BindParams): void;

  /**
   * Execute the statement, fetching the the next line of result, that can
   * be retrieved with `Statement.get`.
   * @see [https://sql.d.ts.org/documentation/Statement.html#["step"]](https://sql.js.org/documentation/Statement.html#%5B%22step%22%5D)
   */
  step(): boolean;
}

/**
 * An iterator over multiple SQL statements in a string, preparing and
 * returning a Statement object for the next SQL statement on each
 * iteration.
 *
 * You can't instantiate this class directly, you have to use a Database
 * object in order to create a statement iterator
 * @see [https://sql.d.ts.org/documentation/StatementIterator.html#StatementIterator](https://sql.js.org/documentation/StatementIterator.html#StatementIterator)
 */
export declare class StatementIterator implements Iterator<Statement>, Iterable<Statement> {
  [Symbol.iterator](): Iterator<Statement>;

  /**
   * Get any un-executed portions remaining of the original SQL string
   * @see [https://sql.d.ts.org/documentation/StatementIterator.html#["getRemainingSQL"]](https://sql.js.org/documentation/StatementIterator.html#%5B%22getRemainingSQL%22%5D)
   */
  getRemainingSql(): string;

  /**
   * Prepare the next available SQL statement
   * @see [https://sql.d.ts.org/documentation/StatementIterator.html#["next"]](https://sql.js.org/documentation/StatementIterator.html#%5B%22next%22%5D)
   */
  next(): StatementIteratorResult;
}

export default function(keepWasm?: boolean): Promise<SqlJsStatic>;
