CREATE TABLE "User" (
	"UserID"	INTEGER NOT NULL,
	"Username"	TEXT,
	"Verified"	TEXT,
	"Followers"	INTEGER,
	PRIMARY KEY("UserID")
);
CREATE TABLE "Tweet" (
	"TweetID"	INTEGER NOT NULL,
	"UserID"	INTEGER NOT NULL,
	"Content"	TEXT,
	CONSTRAINT FK_UserID
	FOREIGN KEY("UserID") REFERENCES "User"("UserID")
		ON DELETE CASCADE,
	PRIMARY KEY("TweetID")
);
CREATE TABLE "Comments" (
	"CommentID"	INTEGER NOT NULL,
	"UserID"	INTEGER NOT NULL,
	"TweetID"	INTEGER,
	"FK_CommentID"	INTEGER,
	"Content"	TEXT,
	CONSTRAINT FK_UserID
	FOREIGN KEY("UserID") REFERENCES "User"("UserID")
		ON DELETE CASCADE,
	CONSTRAINT FK_CommentID
	FOREIGN KEY("FK_CommentID") REFERENCES "Comments"("CommentID")
		ON DELETE CASCADE,
	CONSTRAINT FK_TweetID
	FOREIGN KEY("TweetID") REFERENCES "Tweet"("TweetID")
		ON DELETE CASCADE,
	PRIMARY KEY("CommentID")
);
CREATE TABLE "Likes" (
	"LikeID"	INTEGER NOT NULL,
	"UserID"	INTEGER NOT NULL,
	"TweetID"	INTEGER,
	"CommentID"	INTEGER,
	PRIMARY KEY("LikeID"),
	CONSTRAINT FK_UserID
	FOREIGN KEY("UserID") REFERENCES "User"("UserID")
		ON DELETE CASCADE,
	CONSTRAINT FK_CommentID
	FOREIGN KEY("CommentID") REFERENCES "Comments"("CommentID")
		ON DELETE CASCADE,
	CONSTRAINT FK_TweetID
	FOREIGN KEY("TweetID") REFERENCES "Tweet"("TweetID")
		ON DELETE CASCADE
);
CREATE TABLE "Hashtag" (
	"HashtagID"	INTEGER,
	"Content"	TEXT,
	PRIMARY KEY("HashtagID")
);
CREATE TABLE "HashtagsInContent" (
	"HashtagID"	INTEGER NOT NULL,
	"TweetID"	INTEGER,
	"CommentID"	INTEGER,
	CONSTRAINT FK_HashtagID
	FOREIGN KEY("HashtagID") REFERENCES "Hashtag"("HashtagID")
		ON DELETE CASCADE,
	CONSTRAINT FK_TweetID
	FOREIGN KEY("TweetID") REFERENCES "Tweet"("TweetID")
		ON DELETE CASCADE,
	CONSTRAINT FK_CommentID
	FOREIGN KEY("CommentID") REFERENCES "Comments"("CommentID")
		ON DELETE CASCADE
);
INSERT INTO User VALUES
	(10001,"MelonHusk","true",22049),
	(10002,"DonaldDuck","true",149195),
	(10003,"KamKirl","false",207464),
	(10004,"JustForLaughs","true",22019),
	(10005,"TheRock","false",221749),
	(10006,"ReynoldsFan","false",65449),
	(10007,"SkullPoopL","false",6511789),
	(10008,"PingFinity","true",5464198),
	(10009,"HugeAckman","false",1981497),
	(10010,"SnakeShot","true",47896);
INSERT INTO Tweet VALUES
	(20001,10002,"Pretty sure that the world is just Duckburg"),
	(20002,10003,"If you know what is good for you, you should do it."),
	(20003,10004,"Why the good die young and the bad go to hell?"),
	(20004,10005,"Having snow in your shoe is as much fun as having warm beer."),
	(20005,10007,"Ice bucket challenge"),
	(20006,10008,"Because science, right?"),
	(20007,10009,"Did you know that the number of Nick Cage films correlate with drowning in pool?"),
	(20008,10001,"Make sure you brush your hair before going to bed."),
	(20009,10002,"Bear, beer, beard, bird, turd. Bears are made of poop."),
	(20010,10010,"Rock 'n roll all night long with your best friends!");
INSERT INTO	Comments VALUES
	(30001,10002,20001,NULL,"And Scrooge is the richest living being in the world."),
	(30002,10003,20002,NULL,"What if you don't know what is good for you? Do things to find out?"),
	(30003,10004,20003,null,"Because hell has to fill the torturer positions first."),
	(30004,10006,20004,null,"Or as fun as making out with a pillow."),
	(30005,10007,null,30002,"No no no, you ask from others what is good for them."),
	(30006,10008,null,30003,"This sounds like the typical corporate ladder, where the first ones become executives and managers."),
	(30007,10009,null,30001,"Does Mickey Mouse live in Duckburg or Mouseton?"),
	(30008,10008,null,30002,"Or never do anything so you don't accidentally do anything bad."),
	(30009,10009,20008,null,"The new way to handle bedhair?"),
	(30010,10010,20009,null,"I think you dropped the last screw from your brain.");
INSERT INTO Hashtag VALUES
	(40001,"#win"),
	(40002,"#friends"),
	(40003,"#funny"),
	(40004,"#giveaway"),
	(40005,"#contest"),
	(40006,"#thursdaythoughts"),
	(40007,"#traveltuesday"),
	(40008,"#science"),
	(40009,"#fitness"),
	(40010,"#goals");
INSERT INTO HashtagsInContent VALUES
	(40001,20003,null),
	(40002,20004,null),
	(40003,20005,null),
	(40004,20006,null),
	(40005,null,30006),
	(40006,null,30007),
	(40007,null,30008),
	(40008,null,30009),
	(40009,null,30010),
	(40010,20002,null),
	(40003,20003,null),
	(40004,null,30004),
	(40005,20010,null),
	(40006,20004,null),
	(40008,null,30003),
	(40009,null,30004),
	(40010,null,30005);
INSERT INTO Likes VALUES
	(50001,10010,20003,null),
	(50002,10008,20005,null),
	(50003,10005,null,30005),
	(50004,10010,null,30007),
	(50005,10007,20010,null),
	(50006,10001,null,30007),
	(50007,10003,null,30003),
	(50008,10005,20009,null),
	(50009,10009,20010,null),
	(50010,10010,20010,null);
CREATE VIEW Comments_of_comments AS
SELECT (select Username from User where User.UserID=Comments.UserID) as User, Content as Comment, FK_CommentID as "Commented on" FROM Comments
WHERE FK_CommentID IS NOT NULL
ORDER BY User;
CREATE TRIGGER hashtag_not_allowed 
BEFORE INSERT ON Hashtag
BEGIN
   SELECT
      CASE
	WHEN (select NEW.Content from Hashtag) LIKE "%mayonnaise%" THEN
   	  RAISE (ABORT,"Mayonnaise detected!")
       END;
END;
CREATE VIEW Tweets_and_tags AS
SELECT (select Username from User where User.UserID=Tweet.UserID) as User, 
Tweet.Content as Tweet, group_concat(Hashtag.Content,"") as Hashtag from Tweet
INNER JOIN HashtagsInContent ON HashtagsInContent.TweetID=Tweet.TweetID
INNER JOIN Hashtag ON HashtagsInContent.HashtagID=Hashtag.HashtagID
GROUP BY User;