using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Cci;

namespace BytecodeTranslator.Phone {
  public enum StaticURIMode {
    NOT_STATIC, STATIC_URI_CREATION_ONSITE, STATIC_URI_ROOT_CREATION_ONSITE,
  }

  public static class PhoneCodeHelper {
    // TODO ensure this name is unique in the program code, although it is esoteric enough
    private const string IL_BOOGIE_VAR_PREFIX = "@__BOOGIE_";
    public const string IL_CURRENT_NAVIGATION_URI_VARIABLE = IL_BOOGIE_VAR_PREFIX + "CurrentNavigationURI__";

    public static bool isCreateObjectInstance(this IExpression expr) {
      ICreateObjectInstance createObjExpr = expr as ICreateObjectInstance;
      return (createObjExpr != null);
    }

    public static bool isClass(this ITypeReference typeRef, ITypeReference targetTypeRef) {
      while (typeRef != null) {
        if (typeRef.ResolvedType.Equals(targetTypeRef.ResolvedType))
          return true;

        typeRef = typeRef.ResolvedType.BaseClasses.FirstOrDefault();
      }

      return false;
    }

    public static bool isStringClass(this ITypeReference typeRef, MetadataReaderHost host) {
      ITypeReference targetType = host.PlatformType.SystemString;
      return typeRef.isClass(targetType);
    }

    public static bool isURIClass (this ITypeReference typeRef, MetadataReaderHost host) {
      Microsoft.Cci.Immutable.PlatformType platformType = host.PlatformType as Microsoft.Cci.Immutable.PlatformType;
      if (platformType == null)
        return false;

      IAssemblyReference coreRef = platformType.CoreAssemblyRef;
      AssemblyIdentity systemAssemblyId = new AssemblyIdentity(host.NameTable.GetNameFor("System"), "", coreRef.Version, coreRef.PublicKeyToken, "");
      IAssemblyReference systemAssembly = host.FindAssembly(systemAssemblyId);

      ITypeReference uriTypeRef= platformType.CreateReference(systemAssembly, "System", "URI");
      return typeRef.isClass(uriTypeRef);
    }


    public static bool isPhoneApplicationClass(this ITypeReference typeRef, MetadataReaderHost host) {
      Microsoft.Cci.Immutable.PlatformType platform = host.PlatformType as Microsoft.Cci.Immutable.PlatformType;
      IAssemblyReference coreAssemblyRef = platform.CoreAssemblyRef;
      AssemblyIdentity MSPhoneSystemWindowsAssemblyId =
          new AssemblyIdentity(host.NameTable.GetNameFor("System.Windows"), coreAssemblyRef.Culture, coreAssemblyRef.Version,
                               coreAssemblyRef.PublicKeyToken, "");

      IAssemblyReference systemAssembly = host.FindAssembly(MSPhoneSystemWindowsAssemblyId);
      ITypeReference applicationClass = platform.CreateReference(systemAssembly, "System", "Windows", "Application");

      return typeRef.isClass(applicationClass);
    }

    public static bool isPhoneApplicationPageClass(ITypeReference typeDefinition, MetadataReaderHost host) {
      Microsoft.Cci.Immutable.PlatformType platform = host.PlatformType as Microsoft.Cci.Immutable.PlatformType;
      AssemblyIdentity MSPhoneAssemblyId =
          new AssemblyIdentity(host.NameTable.GetNameFor("Microsoft.Phone"), "", new Version("7.0.0.0"),
                               new byte[] { 0x24, 0xEE, 0xC0, 0xD8, 0xC8, 0x6C, 0xDA, 0x1E }, "");

      IAssemblyReference phoneAssembly = host.FindAssembly(MSPhoneAssemblyId);
      ITypeReference phoneApplicationPageTypeRef = platform.CreateReference(phoneAssembly, "Microsoft", "Phone", "Controls", "PhoneApplicationPage");

      ITypeReference baseClass = typeDefinition.ResolvedType.BaseClasses.FirstOrDefault();
      while (baseClass != null) {
        if (baseClass.ResolvedType.Equals(phoneApplicationPageTypeRef.ResolvedType)) {
          return true;
        }
        baseClass = baseClass.ResolvedType.BaseClasses.FirstOrDefault();
      }

      return false;
    }
  }
}