import { describe, it, expect } from "vitest";
import { debateReducer, createInitialDebateState } from "./engine";
import type { DebateConfig, DebateTopic, RoundData, DebateVerdict } from "./types";

const mockConfig: DebateConfig = { durationMinutes: 3, rounds: 4, timePerTurn: 45 };
const mockTopic: DebateTopic = {
  id: "t1",
  topic: "Climate Policy",
  question: "Should carbon taxes be mandatory?",
  category: "environment",
  heatLevel: 4,
};

describe("debateReducer", () => {
  it("starts in idle phase", () => {
    const state = createInitialDebateState();
    expect(state.phase).toBe("idle");
    expect(state.rounds).toEqual([]);
    expect(state.currentRound).toBe(0);
  });

  it("transitions to config phase on SET_CONFIG", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    expect(state.phase).toBe("config");
    expect(state.config).toEqual(mockConfig);
  });

  it("transitions to topic-select on SET_TOPICS", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "SET_TOPICS", topics: [mockTopic] });
    expect(state.phase).toBe("topic-select");
    expect(state.topicOptions).toHaveLength(1);
  });

  it("records vote on VOTE_TOPIC", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "SET_TOPICS", topics: [mockTopic] });
    state = debateReducer(state, { type: "VOTE_TOPIC", topicId: "t1" });
    expect(state.myVote).toBe("t1");
  });

  it("transitions to round phase on SELECT_TOPIC", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "SET_TOPICS", topics: [mockTopic] });
    state = debateReducer(state, { type: "SELECT_TOPIC", topic: mockTopic });
    expect(state.phase).toBe("round-open");
    expect(state.selectedTopic).toEqual(mockTopic);
    expect(state.currentRound).toBe(1);
  });

  it("tracks argument text on UPDATE_ARGUMENT", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "SET_TOPICS", topics: [mockTopic] });
    state = debateReducer(state, { type: "SELECT_TOPIC", topic: mockTopic });
    state = debateReducer(state, { type: "UPDATE_ARGUMENT", text: "My argument" });
    expect(state.myArgument).toBe("My argument");
  });

  it("transitions to commentary on COMPLETE_ROUND", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "SET_TOPICS", topics: [mockTopic] });
    state = debateReducer(state, { type: "SELECT_TOPIC", topic: mockTopic });
    const round: RoundData = {
      roundNumber: 1,
      openerId: "p1",
      openerArgument: "arg1",
      rebuttalArgument: "arg2",
      openerFactCheck: [],
      rebuttalFactCheck: [],
      commentary: null,
    };
    state = debateReducer(state, { type: "COMPLETE_ROUND", round });
    expect(state.phase).toBe("commentary");
    expect(state.rounds).toHaveLength(1);
  });

  it("advances round on START_ROUND after complete", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "SET_TOPICS", topics: [mockTopic] });
    state = debateReducer(state, { type: "SELECT_TOPIC", topic: mockTopic });
    const round: RoundData = {
      roundNumber: 1,
      openerId: "p1",
      openerArgument: "arg1",
      rebuttalArgument: "arg2",
      openerFactCheck: [],
      rebuttalFactCheck: [],
      commentary: null,
    };
    state = debateReducer(state, { type: "COMPLETE_ROUND", round });
    state = debateReducer(state, { type: "START_ROUND" });
    expect(state.phase).toBe("round-open");
    expect(state.currentRound).toBe(2);
    expect(state.myArgument).toBe("");
  });

  it("transitions to results on SET_VERDICT", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    const verdict: DebateVerdict = {
      winnerId: "p1",
      margin: "clear",
      player1Score: 78,
      player2Score: 55,
      roundVerdicts: [
        { round: 1, edge: "player1", highlight: "Player 1 framed the issue effectively." },
      ],
      turningPoint: "Player 1's rebuttal in round 1 shifted the debate.",
      analysis: "Player 1 presented stronger logical arguments.",
    };
    state = debateReducer(state, { type: "SET_VERDICT", verdict, eloChange: 16 });
    expect(state.phase).toBe("verdict");
    expect(state.verdict).toEqual(verdict);
    expect(state.eloChange).toBe(16);
  });

  it("resets to idle on RESET", () => {
    let state = createInitialDebateState();
    state = debateReducer(state, { type: "SET_CONFIG", config: mockConfig });
    state = debateReducer(state, { type: "RESET" });
    expect(state.phase).toBe("idle");
    expect(state.config).toBeNull();
    expect(state.rounds).toEqual([]);
  });
});