import { describe, it, beforeEach, afterEach } from "node:test";
import assert from "node:assert";
import { initTurnOrder, checkTurn, onSpeakerDone, advanceTurn, resetTurn, getTurnDebugInfo, onNewMessage } from "../plugin/turn-manager.ts";
import { setChannelShuffling, getChannelShuffling } from "../plugin/core/channel-modes.ts";

describe("Shuffle Mode Tests", () => {
  const channelId = "test-channel";

  beforeEach(() => {
    resetTurn(channelId);
  });

  afterEach(() => {
    resetTurn(channelId);
  });

  describe("/turn-shuffling command functionality", () => {
    it("should enable shuffle mode", () => {
      setChannelShuffling(channelId, true);
      assert.strictEqual(getChannelShuffling(channelId), true);
    });

    it("should disable shuffle mode", () => {
      setChannelShuffling(channelId, false);
      assert.strictEqual(getChannelShuffling(channelId), false);
    });

    it("should start with shuffle mode disabled by default", () => {
      assert.strictEqual(getChannelShuffling(channelId), false);
    });
  });

  describe("shuffle mode behavior", () => {
    it("should not reshuffle when shuffling is disabled", () => {
      const botIds = ["agent-a", "agent-b", "agent-c"];
      initTurnOrder(channelId, botIds);

      // Disable shuffling (should be default anyway)
      setChannelShuffling(channelId, false);

      // Simulate a full cycle without reshuffling
      const initialOrder = getTurnDebugInfo(channelId).turnOrder as string[];
      const firstSpeaker = initialOrder[0];

      // Have first speaker finish their turn
      onSpeakerDone(channelId, firstSpeaker, false);

      // Check that the order didn't change (since shuffling is disabled)
      const orderAfterOneTurn = getTurnDebugInfo(channelId).turnOrder as string[];

      // The order should remain the same when shuffling is disabled
      assert.deepStrictEqual(initialOrder, orderAfterOneTurn);
    });

    it("should reshuffle when shuffling is enabled after a full cycle", () => {
      const botIds = ["agent-a", "agent-b", "agent-c"];
      initTurnOrder(channelId, botIds);

      // Enable shuffling
      setChannelShuffling(channelId, true);

      // Get initial order
      const initialOrder = getTurnDebugInfo(channelId).turnOrder as string[];
      const firstSpeaker = initialOrder[0];

      // Complete a full cycle by having each agent speak once
      for (const agent of initialOrder) {
        const turnResult = checkTurn(channelId, agent);
        if (turnResult.allowed) {
          onSpeakerDone(channelId, agent, false);
        }
      }

      // After a full cycle, the order should have potentially changed if shuffling is enabled
      const orderAfterCycle = getTurnDebugInfo(channelId).turnOrder as string[];
      
      // The order might be different due to shuffling, or it might be the same by chance
      // But the important thing is that the shuffling mechanism was called
      assert(Array.isArray(orderAfterCycle));
      assert.strictEqual(orderAfterCycle.length, 3);
    });

    it("should ensure last speaker doesn't become first in next round when shuffling", () => {
      const botIds = ["agent-a", "agent-b"];
      initTurnOrder(channelId, botIds);

      // Enable shuffling
      setChannelShuffling(channelId, true);

      // Get initial order
      const initialOrder = getTurnDebugInfo(channelId).turnOrder as string[];
      assert.strictEqual(initialOrder.length, 2);

      // Have first agent speak
      const firstSpeaker = initialOrder[0];
      const secondSpeaker = initialOrder[1];

      // Have first speaker finish
      onSpeakerDone(channelId, firstSpeaker, false);

      // Have second speaker finish (completing a full cycle)
      onSpeakerDone(channelId, secondSpeaker, false);

      // The turn order should be reshuffled but with constraints
      const orderAfterReshuffle = getTurnDebugInfo(channelId).turnOrder as string[];
      
      // Verify the order is still valid
      assert.strictEqual(orderAfterReshuffle.length, 2);
      assert.ok(orderAfterReshuffle.includes("agent-a"));
      assert.ok(orderAfterReshuffle.includes("agent-b"));
    });

    it("should handle single agent scenario gracefully", () => {
      const botIds = ["agent-a"];
      initTurnOrder(channelId, botIds);

      // Enable shuffling
      setChannelShuffling(channelId, true);

      // Single agent should work fine
      const turnResult = checkTurn(channelId, "agent-a");
      assert.strictEqual(turnResult.allowed, true);

      onSpeakerDone(channelId, "agent-a", false);

      // Should still work with single agent after reshuffle attempt
      const turnResultAfter = checkTurn(channelId, "agent-a");
      assert.strictEqual(turnResultAfter.allowed, true);
    });

    it("should handle double agent scenario properly", () => {
      const botIds = ["agent-a", "agent-b"];
      initTurnOrder(channelId, botIds);

      // Enable shuffling
      setChannelShuffling(channelId, true);

      const initialOrder = getTurnDebugInfo(channelId).turnOrder as string[];
      const firstSpeaker = initialOrder[0];
      const secondSpeaker = initialOrder[1];

      // Have first speaker finish
      onSpeakerDone(channelId, firstSpeaker, false);

      // Have second speaker finish (this completes a cycle)
      onSpeakerDone(channelId, secondSpeaker, false);

      // The order might be reshuffled, but it should be valid
      const newOrder = getTurnDebugInfo(channelId).turnOrder as string[];
      assert.strictEqual(newOrder.length, 2);
      assert.ok(newOrder.includes("agent-a"));
      assert.ok(newOrder.includes("agent-b"));

      // Next speaker should be determined by the new order
      const nextSpeaker = advanceTurn(channelId);
      assert.ok(["agent-a", "agent-b"].includes(nextSpeaker as string));
    });
  });

  describe("compatibility with other modes", () => {
    it("should work with dormant state", () => {
      const botIds = ["agent-a", "agent-b"];
      initTurnOrder(channelId, botIds);

      setChannelShuffling(channelId, true);

      // Start with dormant state
      resetTurn(channelId);
      const dormantState = getTurnDebugInfo(channelId);
      assert.strictEqual(dormantState.dormant, true);

      // Activate with new message
      onNewMessage(channelId, "agent-a", false);
      const activeState = getTurnDebugInfo(channelId);
      assert.strictEqual(activeState.dormant, false);
      assert.ok(activeState.currentSpeaker);
    });
  });
});