What does 1 Kings 22:5-23 mean?

And Jehoshaphat said to the king of Israel, “Inquire first for the word of the LORD.” Then the king of Israel gathered the prophets together, about four hundred men, and said to them, “Shall I go to battle against Ramoth-gilead, or shall I refrain?” And they said, “Go up, for the Lord will give it into the hand of the king.” But Jehoshaphat said, “Is there not here another prophet of the LORD of whom we may inquire?” And the king of Israel said to Jehoshaphat, “There is yet one man by whom we may inquire of the LORD, Micaiah the son of Imlah, but I hate him, for he never prophesies good concerning me, but evil.” And Jehoshaphat said, “Let not the king say so.” Then the king of Israel summoned an officer and said, “Bring quickly Micaiah the son of Imlah.” Now the king of Israel and Jehoshaphat the king of Judah were sitting on their thrones, arrayed in their robes, at the threshing floor at the entrance of the gate of Samaria, and all the prophets were prophesying before them. And Zedekiah the son of Chenaanah made for himself horns of iron and said, “Thus says the LORD, ‘With these you shall push the Syrians until they are destroyed.’” And all the prophets prophesied so and said, “Go up to Ramoth-gilead and triumph; the LORD will give it into the hand of the king.” And the messenger who went to summon Micaiah said to him, “Behold, the words of the prophets with one accord are favorable to the king. Let your word be like the word of one of them, and speak favorably.” But Micaiah said, “As the LORD lives, what the LORD says to me, that I will speak.” And when he had come to the king, the king said to him, “Micaiah, shall we go to Ramoth-gilead to battle, or shall we refrain?” And he answered him, “Go up and triumph; the LORD will give it into the hand of the king.” But the king said to him, “How many times shall I make you swear that you speak to me nothing but the truth in the name of the LORD?” And he said, “I saw all Israel scattered on the mountains, as sheep that have no shepherd. And the LORD said, ‘These have no master; let each return to his home in peace.’” And the king of Israel said to Jehoshaphat, “Did I not tell you that he would not prophesy good concerning me, but evil?” And Micaiah said, “Therefore hear the word of the LORD: I saw the LORD sitting on his throne, and all the host of heaven standing beside him on his right hand and on his left; and the LORD said, ‘Who will entice Ahab, that he may go up and fall at Ramoth-gilead?’ And one said one thing, and another said another. Then a spirit came forward and stood before the LORD, saying, ‘I will entice him.’ And the LORD said to him, ‘By what means?’ And he said, ‘I will go out, and will be a lying spirit in the mouth of all his prophets.’ And he said, ‘You are to entice him, and you shall succeed; go out and do so.’ Now therefore behold, the LORD has put a lying spirit in the mouth of all these your prophets; the LORD has declared disaster for you.”