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using System;
using System.Collections;
using System.Collections.Generic;

using Mono.Debugger.Backend;
using Mono.Debugger.Backend.Mono;

namespace Mono.Debugger.Languages.Mono
{
internal class MonoClassInfo : TargetClass
{
public readonly MonoSymbolFile SymbolFile;
public readonly TargetAddress KlassAddress;
public readonly TargetAddress GenericContainer;
public readonly TargetAddress GenericClass;

public readonly Cecil.TypeDefinition CecilType;

TargetType type;
IMonoStructType struct_type;

MonoClassInfo parent_info;
TargetAddress parent_klass = TargetAddress.Null;
TargetType[] field_types;
MonoFieldInfo[] fields;
int[] field_offsets;
MonoMethodInfo[] methods;
MonoPropertyInfo[] properties;
Dictionary<int,TargetAddress> methods_by_token;

public static MonoClassInfo ReadClassInfo (MonoLanguageBackend mono,
TargetMemoryAccess target,
TargetAddress klass)
{
TargetAddress image = mono.MetadataHelper.MonoClassGetMonoImage (target, klass);
MonoSymbolFile file = mono.GetImage (image);
if (file == null)
throw new InternalError ();

int token = mono.MetadataHelper.MonoClassGetToken (target, klass);
if ((token & 0xff000000) != 0x02000000)
throw new InternalError ();

Cecil.TypeDefinition typedef;
typedef = (Cecil.TypeDefinition) file.ModuleDefinition.LookupToken (
new Cecil.MetadataToken (Cecil.TokenType.TypeDef, token & 0x00ffffff));
if (typedef == null)
throw new InternalError ();

MonoClassInfo info = new MonoClassInfo (file, typedef, target, klass);
if ((file == mono.BuiltinTypes.Corlib) &&
(typedef.FullName == "System.Decimal")) {
MonoFundamentalType ftype = mono.BuiltinTypes.DecimalType;

if (ftype.ClassType == null) {
MonoClassType ctype = new MonoClassType (file, typedef, info);
((IMonoStructType) ctype).ClassInfo = info;
ftype.SetClass (ctype);
}

info.struct_type = (IMonoStructType) ftype.ClassType;
info.type = ftype;
} else if (info.IsGenericClass) {
info.struct_type = (IMonoStructType)
file.MonoLanguage.ReadGenericClass (
target, info.GenericClass, false);
info.type = info.struct_type.Type;
} else {
info.type = file.LookupMonoType (typedef);
if (info.type is TargetClassType)
info.struct_type = (IMonoStructType) info.type;
else
info.struct_type = (IMonoStructType) info.type.ClassType;
}
info.struct_type.ClassInfo = info;
return info;
}

public static MonoClassInfo ReadCoreType (MonoSymbolFile file,
Cecil.TypeDefinition typedef,
TargetMemoryAccess target,
TargetAddress klass,
out MonoClassType type)
{
MonoClassInfo info = new MonoClassInfo (file, typedef, target, klass);
type = new MonoClassType (file, typedef, info);
((IMonoStructType) type).ClassInfo = info;
info.struct_type = type;
info.type = type;
return info;
}

protected MonoClassInfo (MonoSymbolFile file, Cecil.TypeDefinition typedef,
TargetMemoryAccess target, TargetAddress klass)
{
this.SymbolFile = file;
this.KlassAddress = klass;
this.CecilType = typedef;

parent_klass = MetadataHelper.MonoClassGetParent (target, klass);
GenericClass = MetadataHelper.MonoClassGetGenericClass (target, klass);
GenericContainer = MetadataHelper.MonoClassGetGenericContainer (target, klass);
}

protected MetadataHelper MetadataHelper {
get { return SymbolFile.MonoLanguage.MetadataHelper; }
}

public override TargetType RealType {
get { return type; }
}

public override TargetClassType Type {
get { return struct_type.Type; }
}

public bool IsGenericClass {
get { return !GenericClass.IsNull; }
}

internal int GetInstanceSize (TargetMemoryAccess target)
{
return MetadataHelper.MonoClassGetInstanceSize (target, KlassAddress);
}

internal MonoFieldInfo[] GetFields (TargetMemoryAccess target)
{
if (fields != null)
return fields;

int field_count = MetadataHelper.MonoClassGetFieldCount (target, KlassAddress);
if ((field_count != 0) && !MetadataHelper.MonoClassHasFields (target, KlassAddress))
throw new TargetException (TargetError.ClassNotInitialized);

fields = new MonoFieldInfo [field_count];
field_offsets = new int [field_count];
field_types = new TargetType [field_count];

for (int i = 0; i < field_count; i++) {
Cecil.FieldDefinition field = CecilType.Fields [i];

TargetAddress type_addr = MetadataHelper.MonoClassGetFieldType (
target, KlassAddress, i);

field_types [i] = SymbolFile.MonoLanguage.ReadType (target, type_addr);
field_offsets [i] = MetadataHelper.MonoClassGetFieldOffset (
target, KlassAddress, i);

fields [i] = new MonoFieldInfo (struct_type, field_types [i], i, field);
}

return fields;
}

public override TargetFieldInfo[] GetFields (Thread thread)
{
if (fields != null)
return fields;

thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
GetFields (target);
return null;
});

return fields;
}

public override TargetObject GetField (Thread thread,
TargetStructObject instance,
TargetFieldInfo field)
{
if (field.HasConstValue)
return SymbolFile.MonoLanguage.CreateInstance (thread, field.ConstValue);

if (field.IsStatic) {
return GetStaticField (thread, field);
} else {
if (instance == null)
throw new InvalidOperationException ();

return (TargetObject) thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
return GetInstanceField (target, instance, field);
});
}
}

internal TargetObject GetInstanceField (TargetMemoryAccess target,
TargetStructObject instance,
TargetFieldInfo field)
{
GetFields (target);

int offset = field_offsets [field.Position];
TargetType type = field_types [field.Position];

if (!Type.IsByRef)
offset -= 2 * target.TargetMemoryInfo.TargetAddressSize;
TargetLocation field_loc = instance.Location.GetLocationAtOffset (offset);

TargetAddress orig_addr = field_loc.GetAddress (target);

if (type.IsByRef)
field_loc = field_loc.GetDereferencedLocation ();

TargetAddress addr = field_loc.GetAddress (target);

if (field_loc.HasAddress && field_loc.GetAddress (target).IsNull)
return new TargetNullObject (type);

return type.GetObject (target, field_loc);
}

internal TargetObject GetStaticField (Thread thread, TargetFieldInfo field)
{
if (!thread.CurrentFrame.Language.IsManaged)
throw new TargetException (TargetError.InvalidContext);

TargetAddress data_address = thread.CallMethod (
SymbolFile.MonoLanguage.MonoDebuggerInfo.ClassGetStaticFieldData,
KlassAddress, 0);

return (TargetObject) thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
return GetStaticField (target, field, data_address);
});
}

internal TargetObject GetStaticField (TargetMemoryAccess target, TargetFieldInfo field,
TargetAddress data_address)
{
GetFields (target);

int offset = field_offsets [field.Position];
TargetType type = field_types [field.Position];

TargetLocation location = new AbsoluteTargetLocation (data_address);
TargetLocation field_loc = location.GetLocationAtOffset (offset);

if (type.IsByRef)
field_loc = field_loc.GetDereferencedLocation ();

return type.GetObject (target, field_loc);
}

public override void SetField (Thread thread, TargetStructObject instance,
TargetFieldInfo field, TargetObject value)
{
if (field.IsStatic) {
if (instance != null)
throw new InvalidOperationException ();

SetStaticField (thread, field, value);
} else {
if (instance == null)
throw new InvalidOperationException ();

thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
SetInstanceField (target, instance, field, value);
return null;
});
}
}

internal void SetInstanceField (TargetMemoryAccess target,
TargetStructObject instance,
TargetFieldInfo field, TargetObject obj)
{
GetFields (target);

int offset = field_offsets [field.Position];
TargetType type = field_types [field.Position];

if (!Type.IsByRef)
offset -= 2 * target.TargetMemoryInfo.TargetAddressSize;
TargetLocation field_loc = instance.Location.GetLocationAtOffset (offset);

if (type.IsByRef)
field_loc = field_loc.GetDereferencedLocation ();

type.SetObject (target, field_loc, obj);
}

internal void SetStaticField (Thread thread, TargetFieldInfo field,
TargetObject obj)
{
if (!thread.CurrentFrame.Language.IsManaged)
throw new TargetException (TargetError.InvalidContext);

TargetAddress data_address = thread.CallMethod (
SymbolFile.MonoLanguage.MonoDebuggerInfo.ClassGetStaticFieldData,
KlassAddress, 0);

thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
SetStaticField (target, field, data_address, obj);
return null;
});
}

internal void SetStaticField (TargetMemoryAccess target, TargetFieldInfo field,
TargetAddress data_address, TargetObject obj)
{
GetFields (target);

int offset = field_offsets [field.Position];
TargetType type = field_types [field.Position];

TargetLocation location = new AbsoluteTargetLocation (data_address);
TargetLocation field_loc = location.GetLocationAtOffset (offset);

if (type.IsByRef)
field_loc = field_loc.GetDereferencedLocation ();

type.SetObject (target, field_loc, obj);
}

internal MonoPropertyInfo[] GetProperties (TargetMemoryAccess target)
{
if (properties != null)
return properties;

properties = new MonoPropertyInfo [CecilType.Properties.Count];

for (int i = 0; i < CecilType.Properties.Count; i++) {
Cecil.PropertyDefinition prop = CecilType.Properties [i];
properties [i] = MonoPropertyInfo.Create (struct_type, i, prop);
}

return properties;
}

public override TargetPropertyInfo[] GetProperties (Thread thread)
{
return (MonoPropertyInfo []) thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
return GetProperties (target);
});
}

void get_methods (TargetMemoryAccess target)
{
if (methods_by_token != null)
return;

try {
if (!MetadataHelper.MonoClassHasMethods (target, KlassAddress))
return;

int count = MetadataHelper.MonoClassGetMethodCount (target, KlassAddress);

methods_by_token = new Dictionary<int,TargetAddress> ();

for (int i = 0; i < count; i++) {
TargetAddress address = MetadataHelper.MonoClassGetMethod (
target, KlassAddress, i);
int mtoken = MetadataHelper.MonoMethodGetToken (target, address);
if (mtoken != 0)
methods_by_token.Add (mtoken, address);
}

methods = new MonoMethodInfo [CecilType.Methods.Count];
for (int i = 0; i < methods.Length; i ++) {
Cecil.MethodDefinition m = CecilType.Methods [i];
methods [i] = MonoMethodInfo.Create (struct_type, i, m);
}
} catch {
methods_by_token = null;
methods = null;
throw;
}
}

public TargetAddress GetMethodAddress (TargetMemoryAccess target, int token)
{
get_methods (target);
if ((methods_by_token == null) || !methods_by_token.ContainsKey (token))
return TargetAddress.Null;
return methods_by_token [token];
}

public override TargetMethodInfo[] GetMethods (Thread thread)
{
if (methods != null)
return methods;

thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
get_methods (target);
return null;
});

return methods;
}

void get_parent (TargetMemoryAccess target)
{
parent_klass = MetadataHelper.MonoClassGetParent (target, KlassAddress);
if (parent_klass.IsNull)
return;

parent_info = ReadClassInfo (SymbolFile.MonoLanguage, target, parent_klass);
}

public override bool HasParent {
get { return !parent_klass.IsNull; }
}

internal MonoClassInfo GetParent (TargetMemoryAccess target)
{
if (parent_info != null)
return parent_info;

get_parent (target);
return parent_info;
}

public override TargetClass GetParent (Thread thread)
{
if (parent_info != null)
return parent_info;

thread.ThreadServant.DoTargetAccess (
delegate (TargetMemoryAccess target) {
get_parent (target);
return null;
});
return parent_info;
}

public override string ToString ()
{
return String.Format ("ClassInfo ({0}:{1}:{2}:{3})",
SymbolFile.Assembly.Name.Name, KlassAddress,
GenericContainer, GenericClass);
}
}
}
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