text: import debug from 'debug';
  import { _, spread } from './symbols';
  import { OTPError } from './error';
  import { Pid, Ref } from './types';
  
  const log = debug('otpjs:core:matching');
  
  const patterns = new WeakMap();
  
  export function caseOf(value) {
      return (pattern) => compare(pattern, value);
  }
  
  export function match(...patterns) {
      let compiled = patterns.map(compile);
  
      return function matchAny(message) {
          for (let compare of compiled) {
              if (compare(message)) {
                  return true;
              }
          }
          return false;
      };
  }
  
  export function compare(pattern, value) {
      const compiled = compile(pattern);
      return compiled(value);
  }
  
  export function compile(pattern) {
      if (typeof pattern === 'function') {
          return pattern;
      } else {
          if (patterns.has(pattern)) {
              const compiledPattern = patterns.get(pattern);
              return compiledPattern;
          } else if (typeof pattern === 'object') {
              const compiledPattern = doCompile(pattern);
              patterns.set(pattern, compiledPattern);
              return compiledPattern;
          } else {
              return doCompile(pattern);
          }
      }
  }
  
  function doCompile(pattern) {
      const comparisons = comparator(pattern);
      return compiledPattern;
      function compiledPattern(message) {
          for (let compare of comparisons) {
              log('%o(%o)', compare, message);
              if (!compare(message)) {
                  return false;
              }
          }
          return true;
      }
  }
  
  function comparator(pattern, comparisons = []) {
      if (Array.isArray(pattern)) {
          arrayComparator(pattern, comparisons);
      } else if (Pid.isPid(pattern)) {
          pidComparator(pattern, comparisons);
      } else if (Ref.isRef(pattern)) {
          refComparator(pattern, comparisons);
      } else if (typeof pattern === 'object') {
          objectComparator(pattern, comparisons);
      } else if (typeof pattern === 'function') {
          comparisons.push(pattern);
      } else if (pattern === _) {
          comparisons.push(underscore);
      } else {
          simpleComparator(pattern, comparisons);
      }
  
      return comparisons;
  }
  
  function pidComparator(pattern, comparisons) {
      comparisons.push(
          (value) => Pid.isPid(value) && Pid.compare(pattern, value) === 0
      );
  }
  
  function refComparator(pattern, comparisons) {
      comparisons.push(
          (value) => Ref.isRef(value) && Ref.compare(pattern, value) === 0
      );
  }
  
  function simpleComparator(pattern, comparisons) {
      comparisons.push(function simpleCompare(message) {
          log(
              '%o(%o, %o) = %o',
              simpleCompare,
              pattern,
              message,
              pattern === message
          );
          return message === pattern;
      });
  }
  
  function arrayComparator(pattern, comparisons, subComparisons = []) {
      const spreadIndex = pattern.indexOf(spread);
      let spreadPattern = _;
  
      comparisons.push(function isArray(message) {
          return Array.isArray(message);
      });
  
      if (spreadIndex >= 0) {
          log('%o(%o)', arrayComparator, pattern);
          if (spreadIndex < pattern.length - 2) {
              log('%o(%o) : invalid_pattern', arrayComparator, pattern);
              throw new OTPError('invalid_match_pattern');
          } else {
              const length = spreadIndex;
              log(
                  '%o(%o) : containsAtLeast(%o)',
                  arrayComparator,
                  pattern,
                  length
              );
              comparisons.push(function containsAtLeast(message) {
                  return message.length >= length;
              });
          }
      } else {
          const length = pattern.length;
          log('%o(%o) : matchesLength(%o)', arrayComparator, pattern, length);
          comparisons.push(function matchesLength(message) {
              return message.length === length;
          });
      }
  
      log('%o(%o)', arrayComparator, pattern);
      for (let index = 0; index < pattern.length; index++) {
          const subPattern = pattern[index];
          log(
              '%o(%o) : compileSubPattern[%o](%o)',
              arrayComparator,
              pattern,
              index,
              subPattern
          );
          if (subPattern === spread) {
              log('%o(%o) : spread', arrayComparator, pattern);
              if (pattern.length === spreadIndex + 2) {
                  log(
                      '%o(%o) : spreadPattern : %o',
                      arrayComparator,
                      pattern,
                      spreadPattern
                  );
                  spreadPattern = pattern[index + 1];
              }
          } else if (spreadIndex < 0 || index < spreadIndex) {
              const subComparison = compile(subPattern);
              log(
                  '%o(%o) : subComparisons.push(%o)',
                  arrayComparator,
                  pattern,
                  subComparison
              );
              subComparisons.push(subComparison);
          }
      }
  
      comparisons.push(function compareArrayItems(message) {
          let index;
          let matches = true;
  
          log('%o(%o) : begin : %o', compareArrayItems, message, subComparisons);
  
          for (index = 0; index < subComparisons.length && matches; index++) {
              const compare = subComparisons[index];
              log(
                  '%o(%o) : %o(%o)',
                  compareArrayItems,
                  message,
                  compare,
                  message[index]
              );
              matches = matches && compare(message[index]);
          }
  
          log('%o(%o) : end : %O', compareArrayItems, message, matches);
  
          return matches;
      });
  
      if (spreadIndex >= 0) {
          const compareSpread = compile(spreadPattern);
          comparisons.push(function compareArraySpreadItems(message) {
              let matches = true;
              for (
                  let index = spreadIndex;
                  index < message.length && matches;
                  index++
              ) {
                  log('%o(%o)', compareSpread, message[index]);
                  matches = matches && compareSpread(message[index]);
              }
              return matches;
          });
      }
  }
  
  function objectComparator(pattern, comparisons) {
      comparisons.push(function isObject(message) {
          return typeof message === 'object';
      });
  
      const keys = Object.getOwnPropertyNames(pattern).concat(
          Object.getOwnPropertySymbols(pattern)
      );
      const subPatterns = keys.map((key) => pattern[key]);
      const subComparisons = {};
  
      if (!keys.includes(spread)) {
          comparisons.push(function matchesSize(message) {
              const messageKeys = Object.getOwnPropertyNames(message).concat(
                  Object.getOwnPropertySymbols(message)
              );
              return messageKeys.length === keys.length;
          });
      }
  
      for (let index = 0; index < keys.length; index++) {
          const key = keys[index];
          const subPattern = subPatterns[index];
  
          if (subPattern === _) {
              subComparisons[key] = underscore;
          } else {
              let keyName = key;
              if (typeof key === 'symbol') {
                  keyName = key.toString();
              }
              subComparisons[key] = compile(subPattern);
          }
      }
  
      comparisons.push(function compareObjectValues(message) {
          const keys = Object.getOwnPropertyNames(message).concat(
              Object.getOwnPropertySymbols(message)
          );
  
          for (let index = 0; index < keys.length; index++) {
              const key = keys[index];
              const compare = subComparisons[key];
  
              if (compare) {
                  if (!compare(message[key])) {
                      return false;
                  }
              } else {
                  if (!subComparisons[spread](message[key])) {
                      return false;
                  }
              }
          }
  
          return true;
      });
  }
  
  function underscore(_message) {
      return true;
  }
  