//
//  FLEXMethodCallingViewController.m
//  Flipboard
//
//  Created by Ryan Olson on 5/23/14.
//  Copyright (c) 2014 Flipboard. All rights reserved.
//

#import "FLEXMethodCallingViewController.h"
#import "FLEXRuntimeUtility.h"
#import "FLEXFieldEditorView.h"
#import "FLEXObjectExplorerFactory.h"
#import "FLEXObjectExplorerViewController.h"
#import "FLEXArgumentInputView.h"
#import "FLEXArgumentInputViewFactory.h"
#import "FLEXUtility.h"

@interface FLEXMethodCallingViewController ()

@property (nonatomic) Method method;
@property (nonatomic) FLEXTypeEncoding *returnType;

@end

@implementation FLEXMethodCallingViewController

- (id)initWithTarget:(id)target method:(Method)method
{
    self = [super initWithTarget:target];
    if (self) {
        self.method = method;
        self.returnType = [FLEXRuntimeUtility returnTypeForMethod:method];
        self.title = [self isClassMethod] ? @"Class Method" : @"Method";
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    NSString *returnType = @((const char *)self.returnType);
    NSString *methodDescription = [FLEXRuntimeUtility prettyNameForMethod:self.method isClassMethod:[self isClassMethod]];
    NSString *format = @"Signature:\n%@\n\nReturn Type:\n%@";
    NSString *info = [NSString stringWithFormat:format, methodDescription, returnType];
    self.fieldEditorView.fieldDescription = info;
    
    NSArray<NSString *> *methodComponents = [FLEXRuntimeUtility prettyArgumentComponentsForMethod:self.method];
    NSMutableArray<FLEXArgumentInputView *> *argumentInputViews = [NSMutableArray array];
    unsigned int argumentIndex = kFLEXNumberOfImplicitArgs;
    for (NSString *methodComponent in methodComponents) {
        char *argumentTypeEncoding = method_copyArgumentType(self.method, argumentIndex);
        FLEXArgumentInputView *inputView = [FLEXArgumentInputViewFactory argumentInputViewForTypeEncoding:argumentTypeEncoding];
        free(argumentTypeEncoding);
        
        inputView.backgroundColor = self.view.backgroundColor;
        inputView.title = methodComponent;
        [argumentInputViews addObject:inputView];
        argumentIndex++;
    }
    self.fieldEditorView.argumentInputViews = argumentInputViews;
}

- (void)dealloc
{
    free(self.returnType);
    self.returnType = NULL;
}

- (BOOL)isClassMethod
{
    return self.target && self.target == [self.target class];
}

- (NSString *)titleForActionButton
{
    return @"Call";
}

- (void)actionButtonPressed:(id)sender
{
    [super actionButtonPressed:sender];
    
    NSMutableArray *arguments = [NSMutableArray array];
    for (FLEXArgumentInputView *inputView in self.fieldEditorView.argumentInputViews) {
        id argumentValue = inputView.inputValue;
        if (!argumentValue) {
            // Use NSNulls as placeholders in the array. They will be interpreted as nil arguments.
            argumentValue = [NSNull null];
        }
        [arguments addObject:argumentValue];
    }
    
    NSError *error = nil;
    id returnedObject = [FLEXRuntimeUtility performSelector:method_getName(self.method) onObject:self.target withArguments:arguments error:&error];
    
    if (error) {
        [FLEXAlert showAlert:@"Method Call Failed" message:[error localizedDescription] from:self];
    } else if (returnedObject) {
        // For non-nil (or void) return types, push an explorer view controller to display the returned object
        returnedObject = [FLEXRuntimeUtility potentiallyUnwrapBoxedPointer:returnedObject type:self.returnType];
        FLEXObjectExplorerViewController *explorerViewController = [FLEXObjectExplorerFactory explorerViewControllerForObject:returnedObject];
        [self.navigationController pushViewController:explorerViewController animated:YES];
    } else {
        [self exploreObjectOrPopViewController:returnedObject];
    }
}

@end