/**
 * @license
 * Copyright 2015 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file PHP code generator class, including helper methods for
 * generating PHP for blocks.
 */

// Former goog.module ID: Blockly.PHP

import * as stringUtils from '../../core/utils/string.js';
import type {Block} from '../../core/block.js';
import {CodeGenerator} from '../../core/generator.js';
import {Names} from '../../core/names.js';
import type {Workspace} from '../../core/workspace.js';
import {inputTypes} from '../../core/inputs/input_types.js';

/**
 * Order of operation ENUMs.
 * http://php.net/manual/en/language.operators.precedence.php
 */
// prettier-ignore
export enum Order {
  ATOMIC = 0,             // 0 "" ...
  CLONE = 1,              // clone
  NEW = 1,                // new
  MEMBER = 2.1,           // []
  FUNCTION_CALL = 2.2,    // ()
  POWER = 3,              // **
  INCREMENT = 4,          // ++
  DECREMENT = 4,          // --
  BITWISE_NOT = 4,        // ~
  CAST = 4,               // (int) (float) (string) (array) ...
  SUPPRESS_ERROR = 4,     // @
  INSTANCEOF = 5,         // instanceof
  LOGICAL_NOT = 6,        // !
  UNARY_PLUS = 7.1,       // +
  UNARY_NEGATION = 7.2,   // -
  MULTIPLICATION = 8.1,   // *
  DIVISION = 8.2,         // /
  MODULUS = 8.3,          // %
  ADDITION = 9.1,         // +
  SUBTRACTION = 9.2,      // -
  STRING_CONCAT = 9.3,    // .
  BITWISE_SHIFT = 10,     // << >>
  RELATIONAL = 11,        // < <= > >=
  EQUALITY = 12,          // == != === !== <> <=>
  REFERENCE = 13,         // &
  BITWISE_AND = 13,       // &
  BITWISE_XOR = 14,       // ^
  BITWISE_OR = 15,        // |
  LOGICAL_AND = 16,       // &&
  LOGICAL_OR = 17,        // ||
  IF_NULL = 18,           // ??
  CONDITIONAL = 19,       // ?:
  ASSIGNMENT = 20,        // = += -= *= /= %= <<= >>= ...
  LOGICAL_AND_WEAK = 21,  // and
  LOGICAL_XOR = 22,       // xor
  LOGICAL_OR_WEAK = 23,   // or
  NONE = 99,              // (...)
}

export class PhpGenerator extends CodeGenerator {
  /** List of outer-inner pairings that do NOT require parentheses. */
  ORDER_OVERRIDES: [Order, Order][] = [
    // (foo()).bar() -> foo().bar()
    // (foo())[0] -> foo()[0]
    [Order.MEMBER, Order.FUNCTION_CALL],
    // (foo[0])[1] -> foo[0][1]
    // (foo.bar).baz -> foo.bar.baz
    [Order.MEMBER, Order.MEMBER],
    // !(!foo) -> !!foo
    [Order.LOGICAL_NOT, Order.LOGICAL_NOT],
    // a * (b * c) -> a * b * c
    [Order.MULTIPLICATION, Order.MULTIPLICATION],
    // a + (b + c) -> a + b + c
    [Order.ADDITION, Order.ADDITION],
    // a && (b && c) -> a && b && c
    [Order.LOGICAL_AND, Order.LOGICAL_AND],
    // a || (b || c) -> a || b || c
    [Order.LOGICAL_OR, Order.LOGICAL_OR],
  ];

  /** @param name Name of the language the generator is for. */
  constructor(name = 'PHP') {
    super(name);
    this.isInitialized = false;

    // Copy Order values onto instance for backwards compatibility
    // while ensuring they are not part of the publically-advertised
    // API.
    //
    // TODO(#7085): deprecate these in due course.  (Could initially
    // replace data properties with get accessors that call
    // deprecate.warn().)
    for (const key in Order) {
      // Must assign Order[key] to a temporary to get the type guard to work;
      // see https://github.com/microsoft/TypeScript/issues/10530.
      const value = Order[key];
      // Skip reverse-lookup entries in the enum.  Due to
      // https://github.com/microsoft/TypeScript/issues/55713 this (as
      // of TypeScript 5.5.2) actually narrows the type of value to
      // never - but that still allows the following assignment to
      // succeed.
      if (typeof value === 'string') continue;
      (this as unknown as Record<string, Order>)['ORDER_' + key] = value;
    }

    // List of illegal variable names.  This is not intended to be a
    // security feature.  Blockly is 100% client-side, so bypassing
    // this list is trivial.  This is intended to prevent users from
    // accidentally clobbering a built-in object or function.
    this.addReservedWords(
      // http://php.net/manual/en/reserved.keywords.php
      '__halt_compiler,abstract,and,array,as,break,callable,case,catch,class,' +
        'clone,const,continue,declare,default,die,do,echo,else,elseif,empty,' +
        'enddeclare,endfor,endforeach,endif,endswitch,endwhile,eval,exit,' +
        'extends,final,for,foreach,function,global,goto,if,implements,include,' +
        'include_once,instanceof,insteadof,interface,isset,list,namespace,new,' +
        'or,print,private,protected,public,require,require_once,return,static,' +
        'switch,throw,trait,try,unset,use,var,while,xor,' +
        // http://php.net/manual/en/reserved.constants.php
        'PHP_VERSION,PHP_MAJOR_VERSION,PHP_MINOR_VERSION,PHP_RELEASE_VERSION,' +
        'PHP_VERSION_ID,PHP_EXTRA_VERSION,PHP_ZTS,PHP_DEBUG,PHP_MAXPATHLEN,' +
        'PHP_OS,PHP_SAPI,PHP_EOL,PHP_INT_MAX,PHP_INT_SIZE,DEFAULT_INCLUDE_PATH,' +
        'PEAR_INSTALL_DIR,PEAR_EXTENSION_DIR,PHP_EXTENSION_DIR,PHP_PREFIX,' +
        'PHP_BINDIR,PHP_BINARY,PHP_MANDIR,PHP_LIBDIR,PHP_DATADIR,' +
        'PHP_SYSCONFDIR,PHP_LOCALSTATEDIR,PHP_CONFIG_FILE_PATH,' +
        'PHP_CONFIG_FILE_SCAN_DIR,PHP_SHLIB_SUFFIX,E_ERROR,E_WARNING,E_PARSE,' +
        'E_NOTICE,E_CORE_ERROR,E_CORE_WARNING,E_COMPILE_ERROR,' +
        'E_COMPILE_WARNING,E_USER_ERROR,E_USER_WARNING,E_USER_NOTICE,' +
        'E_DEPRECATED,E_USER_DEPRECATED,E_ALL,E_STRICT,' +
        '__COMPILER_HALT_OFFSET__,TRUE,FALSE,NULL,__CLASS__,__DIR__,__FILE__,' +
        '__FUNCTION__,__LINE__,__METHOD__,__NAMESPACE__,__TRAIT__',
    );
  }

  /**
   * Initialise the database of variable names.
   *
   * @param workspace Workspace to generate code from.
   */
  init(workspace: Workspace) {
    super.init(workspace);

    if (!this.nameDB_) {
      this.nameDB_ = new Names(this.RESERVED_WORDS_, '$');
    } else {
      this.nameDB_.reset();
    }

    this.nameDB_.setVariableMap(workspace.getVariableMap());
    this.nameDB_.populateVariables(workspace);
    this.nameDB_.populateProcedures(workspace);

    this.isInitialized = true;
  }

  /**
   * Prepend the generated code with the variable definitions.
   *
   * @param code Generated code.
   * @returns Completed code.
   */
  finish(code: string): string {
    // Convert the definitions dictionary into a list.
    const definitions = Object.values(this.definitions_);
    // Call Blockly.CodeGenerator's finish.
    code = super.finish(code);
    this.isInitialized = false;

    this.nameDB_!.reset();
    return definitions.join('\n\n') + '\n\n\n' + code;
  }

  /**
   * Naked values are top-level blocks with outputs that aren't plugged into
   * anything.
   *
   * @param line Line of generated code.
   * @returns Legal line of code.
   */
  scrubNakedValue(line: string): string {
    return line + ';\n';
  }

  /**
   * Encode a string as a properly escaped PHP string, complete with
   * quotes.
   *
   * @param string Text to encode.
   * @returns PHP string.
   */
  quote_(string: string): string {
    string = string
      .replace(/\\/g, '\\\\')
      .replace(/\n/g, '\\\n')
      .replace(/'/g, "\\'");
    return "'" + string + "'";
  }

  /**
   * Encode a string as a properly escaped multiline PHP string, complete with
   * quotes.
   * @param string Text to encode.
   * @returns PHP string.
   */
  multiline_quote_(string: string): string {
    const lines = string.split(/\n/g).map(this.quote_);
    // Join with the following, plus a newline:
    // . "\n" .
    // Newline escaping only works in double-quoted strings.
    return lines.join(' . "\\n" .\n');
  }

  /**
   * Common tasks for generating PHP from blocks.
   * Handles comments for the specified block and any connected value blocks.
   * Calls any statements following this block.
   *
   * @param block The current block.
   * @param code The PHP code created for this block.
   * @param thisOnly True to generate code for only this statement.
   * @returns PHP code with comments and subsequent blocks added.
   */
  scrub_(block: Block, code: string, thisOnly = false): string {
    let commentCode = '';
    // Only collect comments for blocks that aren't inline.
    if (!block.outputConnection || !block.outputConnection.targetConnection) {
      // Collect comment for this block.
      let comment = block.getCommentText();
      if (comment) {
        comment = stringUtils.wrap(comment, this.COMMENT_WRAP - 3);
        commentCode += this.prefixLines(comment, '// ') + '\n';
      }
      // Collect comments for all value arguments.
      // Don't collect comments for nested statements.
      for (let i = 0; i < block.inputList.length; i++) {
        if (block.inputList[i].type === inputTypes.VALUE) {
          const childBlock = block.inputList[i].connection!.targetBlock();
          if (childBlock) {
            comment = this.allNestedComments(childBlock);
            if (comment) {
              commentCode += this.prefixLines(comment, '// ');
            }
          }
        }
      }
    }
    const nextBlock =
      block.nextConnection && block.nextConnection.targetBlock();
    const nextCode = thisOnly ? '' : this.blockToCode(nextBlock);
    return commentCode + code + nextCode;
  }

  /**
   * Generate code representing the specified value input, adjusted to take into
   * account indexing (zero- or one-based) and optionally by a specified delta
   * and/or by negation.
   *
   * @param block The block.
   * @param atId The ID of the input block to get (and adjust) the value of.
   * @param delta Value to add.
   * @param negate Whether to negate the value.
   * @param order The highest order acting on this value.
   * @returns The adjusted value or code that evaluates to it.
   */
  getAdjusted(
    block: Block,
    atId: string,
    delta = 0,
    negate = false,
    order = Order.NONE,
  ): string {
    if (block.workspace.options.oneBasedIndex) {
      delta--;
    }
    let defaultAtIndex = block.workspace.options.oneBasedIndex ? '1' : '0';

    let orderForInput = order;
    if (delta > 0) {
      orderForInput = Order.ADDITION;
    } else if (delta < 0) {
      orderForInput = Order.SUBTRACTION;
    } else if (negate) {
      orderForInput = Order.UNARY_NEGATION;
    }

    let at = this.valueToCode(block, atId, orderForInput) || defaultAtIndex;

    // Easy case: no adjustments.
    if (delta === 0 && !negate) {
      return at;
    }
    // If the index is a naked number, adjust it right now.
    if (stringUtils.isNumber(at)) {
      at = String(Number(at) + delta);
      if (negate) {
        at = String(-Number(at));
      }
      return at;
    }
    // If the index is dynamic, adjust it in code.
    if (delta > 0) {
      at = `${at} + ${delta}`;
    } else if (delta < 0) {
      at = `${at} - ${-delta}`;
    }
    if (negate) {
      at = delta ? `-(${at})` : `-${at}`;
    }
    if (Math.floor(order) >= Math.floor(orderForInput)) {
      at = `(${at})`;
    }
    return at;
  }
}