SharingAddon.m

SharingAddon.m

#import "SharingAddon.h"
#import "StandaloneCodeaViewController.h"

#import "lua.h"
#import "lauxlib.h"

#pragma mark - Lua Functions

static int share(struct lua_State *L);
static int email(struct lua_State *L);
static int print(struct lua_State *L);

#pragma mark - Lua Function Mappings

static const luaL_Reg sharingLibs[] =
{
    {"share", share},
    {"email", email},
    {"print", print},
    {NULL, NULL}
};

#pragma mark - Codea Hidden Functions

struct image_type_t;
struct image_type_t *checkimage(lua_State *L, int i);

typedef enum PersistenceImageAlpha
{
    PersistenceImageAlphaPremultiply,
    PerseistenceImageAlphaNoPremultiply
} PersistenceImageAlpha;

UIImage *createUIImageFromImage(struct image_type_t *image, PersistenceImageAlpha alphaOption);

#pragma mark - Sharing Addon

@interface SharingAddon ()

@property (nonatomic, weak) StandaloneCodeaViewController *currentCodeaController;
@property UIPopoverController *popup;

@end

@implementation SharingAddon

#pragma mark - Singleton

+ (instancetype) sharedInstance
{
    static id _sharedObject = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedObject = [[self alloc] init];
    });
    return _sharedObject;
}

#pragma mark - Sharing Utility Methods

- (void)shareWithMessage:(NSString *)text andImage:(UIImage* )image
{
    NSArray *activityItems = @[text, image];
    
    UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];
    
    if ([activityVC respondsToSelector:@selector(popoverPresentationController)])   // iOS 8
    {
        activityVC.popoverPresentationController.sourceView = self.currentCodeaController.view;
        activityVC.popoverPresentationController.sourceRect = CGRectMake(670, 30, 19, 27);
        
        [self.currentCodeaController presentViewController:activityVC animated:YES completion:nil];
    }
    else                                                                            // iOS 7
    {
        self.popup = [[UIPopoverController alloc] initWithContentViewController:activityVC];
        [self.popup presentPopoverFromRect:CGRectMake(670, 30, 19, 27) inView:self.currentCodeaController.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }
}

- (void)sendContactUsEmail
{
    MFMailComposeViewController *mailVC = [[MFMailComposeViewController alloc] init];
    
    mailVC.mailComposeDelegate = self;
    
    [mailVC setMessageBody:@"" isHTML:NO];
    [mailVC setSubject:@"Feedback"];
    [mailVC setToRecipients:@[@"PiWorksLLC@gmail.com"]];
    
    [self.currentCodeaController presentViewController:mailVC animated:YES completion:nil];
}

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    [self.currentCodeaController dismissViewControllerAnimated:YES completion:nil];
}

#pragma mark - Codea Addon Protocol Implementation

- (void) codeaDidRegisterAddon:(StandaloneCodeaViewController *)controller
{
    NSLog(@"Registered Sharing Addon");
}

- (void) codea:(StandaloneCodeaViewController*)codeaController didCreateLuaState:(struct lua_State*)L
{
    self.currentCodeaController = codeaController;
    
    //Register sharing functions with Lua
    luaL_openlib(L, "sharing", sharingLibs, 0);
}

#pragma mark - Lua Function Implementations

static int share(struct lua_State* L)
{
    NSString *message = [NSString stringWithCString:lua_tostring(L, 1) encoding:NSUTF8StringEncoding];
    
    struct image_type_t *imageType = checkimage(L, 2);
    UIImage *picture = createUIImageFromImage(imageType, PerseistenceImageAlphaNoPremultiply);
    
    dispatch_async(dispatch_get_main_queue(), ^{
        [[SharingAddon sharedInstance] shareWithMessage:message andImage:picture];
    });
    
    return 0;
}

static int email(struct lua_State *L)
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [[SharingAddon sharedInstance] sendContactUsEmail];
    });
    
    return 0;
}

static int print(struct lua_State* L)
{
    NSLog([NSString stringWithFormat:[NSString stringWithCString:lua_tostring(L, 1) encoding:NSUTF8StringEncoding]]);
    
    return 0;
}

@end