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/*
* WLRemoteTransformers.j
* Ratatosk
*
* Created by Alexander Ljungberg on September 28, 2011.
* Copyright 2009-11, WireLoad Inc. All rights reserved.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer. Redistributions in binary
* form must reproduce the above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or other materials provided
* with the distribution. Neither the name of WireLoad Inc. nor the names
* of its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

@import "WLDate-Util.j"

var IsNumberRegExp = new RegExp('^\d+$');

@implementation WLDateTransformer : CPObject

+ (BOOL)allowsReverseTransformation
{
    return YES;
}

+ (Class)transformedValueClass
{
    return [CPDate class];
}

- (id)transformedValue:(id)value
{
    if (value)
    {
        // If the timezone specifier was left out, add it.
        var dateTestRegEx = new RegExp(' [+-]\d{4}$');
        if (!dateTestRegEx.test(value))
            value += ' +0000';
        return [[CPDate alloc] initWithString:value];
    }
    else
    {
        return nil;
    }
}

- (id)reverseTransformedValue:(id)value
{
    if (value)
    {
        // We want to send UTC dates.
        return [value utcDescription];
    }
    else
        return nil;
}

@end

@implementation WLIdSingleTransformer : CPObject

+ (BOOL)allowsReverseTransformation
{
    return YES;
}

+ (Class)transformedValueClass
{
    return [CPNumber class];
}

- (id)transformedValue:(id)value
{
    if (value)
        return value.id;
    else
        return nil;
}

- (id)reverseTransformedValue:(id)value
{
    if (value)
        return {'id': value};
    else
        return {};
}

@end

/*!
Instantiate 0 or 1 foreign object using whatever info is available,
or update an existing object if it's already in the register.
*/
@implementation WLForeignObjectTransformer : CPObject
{
    id foreignClass;
}

+ (BOOL)allowsReverseTransformation
{
    return YES;
}

+ (Class)transformedValueClass
{
    return [WLRemoteObject class];
}

+ (id)forObjectClass:aForeignClass
{
    if (r = [self new])
    {
        r.foreignClass = aForeignClass;
    }
    return r;
}

- (id)transformedValue:(id)value
{
    if (value)
        return [[foreignClass alloc] initWithJson:value];

    return null;
}

/*!
Reverse is not exact and just generates ids even if the original
input had more data.
*/
- (id)reverseTransformedValue:(id)value
{
    var pk = [value pk];
    if (pk === nil)
        return nil;

    var dummy = [[foreignClass alloc] init],
        remotePkProperty = [dummy pkProperty],
        pkString = "" + pk,
        remoteName = [remotePkProperty remoteName],
        rObj = {};
    rObj[remoteName] = (IsNumberRegExp.test(pkString) ? parseInt(pkString) : pkString);

    return rObj;
}

@end

/*!
Instantiate foreign objects using whatever info is available,
or update existing objects if they're already in the register.
In both cases, return an array with prepared instances.
*/
@implementation WLForeignObjectsTransformer : WLForeignObjectTransformer
{
}

- (id)transformedValue:(id)values
{
    var r = [];

    if (!values)
        return nil;

    if (!values.isa || ![values isKindOfClass:CPArray])
        [CPException raise:CPInvalidArgumentException reason:"WLForeignObjectsTransformer expects arrays"];

    for (var i = 0, count = [values count]; i < count; i++)
    {
        obj = [super transformedValue:values[i]];
        if (obj !== nil)
            [r addObject:obj];
    }

    return r;
}

/*!
Reverse is not exact and just generates ids even if the original
input had more data.
*/
- (id)reverseTransformedValue:(id)values
{
    var r = [];

    for (var i = 0, count = [values count]; i < count; i++)
    {
        var value = values[i],
            repr = [super reverseTransformedValue:value];
        if (repr)
            [r addObject:repr];
    }

    return r;
}

@end


/*!
Like WLForeignObjectsTransformer but if a value turns out not to be
an array, assume it's a single instance of the foreign object.
*/
@implementation WLForeignObjectOrObjectsTransformer : WLForeignObjectsTransformer
{
}

- (id)transformedValue:(id)values
{
    if (!values)
        return nil;

    if (!values.isa || ![values isKindOfClass:CPArray])
        values = [values];

    return [super transformedValue:values];
}

@end

/*!
Instantiate foreign objects using a primary key value as a string only. If the
object is in the register, it will be used, otherwise a new unloaded object
will be created (which can then be sent ensureLoaded to load fully.)
*/
@implementation WLForeignObjectByIdTransformer : CPObject
{
    id foreignClass;
}

+ (BOOL)allowsReverseTransformation
{
    return YES;
}

+ (Class)transformedValueClass
{
    return [WLRemoteObject class];
}

+ (id)forObjectClass:aForeignClass
{
    if (r = [self new])
    {
        r.foreignClass = aForeignClass;
    }
    return r;
}

- (id)transformedValue:(id)value
{
    return [foreignClass instanceForPk:value create:YES];
}

- (id)reverseTransformedValue:(id)value
{
    return [value pk];
}

@end

/*!
Like WLForeignObjectByIdTransformer but take a list of ids to populate an array
of remote objects. This could be used for an array of resource URIs for instance,
if the PK is the resource URI.
*/
@implementation WLForeignObjectsByIdsTransformer : WLForeignObjectByIdTransformer
{
}

+ (Class)transformedValueClass
{
    return [CPArray class];
}

- (id)transformedValue:(id)values
{
    if (!values)
        return nil;

    if (!values.isa || ![values isKindOfClass:CPArray])
        [CPException raise:CPInvalidArgumentException reason:"WLForeignObjectsTransformer expects arrays"];

    var r = [];
    for (var i = 0, count = [values count]; i < count; i++)
    {
        obj = [super transformedValue:values[i]];
        if (obj !== nil)
            [r addObject:obj];
    }

    return r;
}

- (id)reverseTransformedValue:(id)values
{
    var r = [];

    for (var i = 0, count = [values count]; i < count; i++)
    {
        var value = values[i],
            repr = [super reverseTransformedValue:value];
        if (repr)
            [r addObject:repr];
    }

    return r;
}

@end
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