/**
 * AFL Finals System Tests
 * Phase 3.3: AFL Finals (10 teams with Wildcard Round from 2026)
 *
 * Tests the complex double-chance finals system used by the AFL
 */

import { describe, it, expect } from "vitest";
import { AFL_10, getScoringRoundType } from "~/lib/bracket-templates";
import { calculateFantasyPoints, calculateAveragedPoints, calculateBracketPoints, type ScoringRules } from "../scoring-rules";
import { getBracketEntryFloor } from "../scoring-calculator";

const DEFAULT_SCORING: ScoringRules = {
  pointsFor1st: 100,
  pointsFor2nd: 70,
  pointsFor3rd: 50,
  pointsFor4th: 40,
  pointsFor5th: 25,
  pointsFor6th: 25,
  pointsFor7th: 15,
  pointsFor8th: 15,
};

describe("AFL Finals System - Phase 3.3", () => {
  describe("AFL_10 Template Structure", () => {
    it("has correct template configuration", () => {
      expect(AFL_10.id).toBe("afl_10");
      expect(AFL_10.name).toBe("AFL Finals (10 teams with Wildcard)");
      expect(AFL_10.totalTeams).toBe(10);
      expect(AFL_10.rounds).toHaveLength(6);
      expect(AFL_10.scoringStartsAtRound).toBe("Elimination Finals");
    });

    it("has Wildcard Round as first round (non-scoring)", () => {
      const wildcardRound = AFL_10.rounds[0];
      expect(wildcardRound.name).toBe("Wildcard Round");
      expect(wildcardRound.matchCount).toBe(2);
      expect(wildcardRound.feedsInto).toBe("Elimination Finals");
      expect(wildcardRound.isScoring).toBe(false); // Losers get 0 points
    });

    it("has Qualifying Finals as second round (non-scoring - double chance)", () => {
      const qualifyingRound = AFL_10.rounds[1];
      expect(qualifyingRound.name).toBe("Qualifying Finals");
      expect(qualifyingRound.matchCount).toBe(2);
      expect(qualifyingRound.feedsInto).toBe("Preliminary Finals"); // Winners skip Semi-Finals
      expect(qualifyingRound.isScoring).toBe(false); // Losers get second chance
    });

    it("has Elimination Finals as third round (scoring - share 7-8)", () => {
      const eliminationRound = AFL_10.rounds[2];
      expect(eliminationRound.name).toBe("Elimination Finals");
      expect(eliminationRound.matchCount).toBe(2);
      expect(eliminationRound.feedsInto).toBe("Semi-Finals");
      expect(eliminationRound.isScoring).toBe(true); // Losers share 7th-8th
    });

    it("has Semi-Finals as fourth round (scoring - share 5-6)", () => {
      const semiRound = AFL_10.rounds[3];
      expect(semiRound.name).toBe("Semi-Finals");
      expect(semiRound.matchCount).toBe(2);
      expect(semiRound.feedsInto).toBe("Preliminary Finals");
      expect(semiRound.isScoring).toBe(true); // Losers share 5th-6th
    });

    it("has Preliminary Finals as fifth round (scoring - share 3-4)", () => {
      const prelimRound = AFL_10.rounds[4];
      expect(prelimRound.name).toBe("Preliminary Finals");
      expect(prelimRound.matchCount).toBe(2);
      expect(prelimRound.feedsInto).toBe("Grand Final");
      expect(prelimRound.isScoring).toBe(true); // Losers share 3rd-4th
    });

    it("has Grand Final as final round (scoring - 1st and 2nd)", () => {
      const grandFinalRound = AFL_10.rounds[5];
      expect(grandFinalRound.name).toBe("Grand Final");
      expect(grandFinalRound.matchCount).toBe(1);
      expect(grandFinalRound.feedsInto).toBeNull();
      expect(grandFinalRound.isScoring).toBe(true); // Winner 1st, Loser 2nd
    });
  });

  describe("AFL Scoring Round Types", () => {
    it("identifies Grand Final as finals type", () => {
      const type = getScoringRoundType("Grand Final", AFL_10);
      expect(type).toBe("finals"); // 1st and 2nd
    });

    it("identifies Preliminary Finals as semifinals type", () => {
      const type = getScoringRoundType("Preliminary Finals", AFL_10);
      expect(type).toBe("semifinals"); // Share 3rd-4th
    });

    it("identifies Semi-Finals as quarterfinals type (custom AFL mapping)", () => {
      const type = getScoringRoundType("Semi-Finals", AFL_10);
      expect(type).toBe("quarterfinals"); // Share 5th-6th (custom)
    });

    it("identifies Elimination Finals as quarterfinals type", () => {
      const type = getScoringRoundType("Elimination Finals", AFL_10);
      expect(type).toBe("quarterfinals"); // Share 7th-8th
    });

    it("identifies Qualifying Finals as non-scoring", () => {
      const type = getScoringRoundType("Qualifying Finals", AFL_10);
      expect(type).toBeNull(); // Double chance - no scoring
    });

    it("identifies Wildcard Round as non-scoring", () => {
      const type = getScoringRoundType("Wildcard Round", AFL_10);
      expect(type).toBeNull(); // Early elimination
    });
  });

  describe("AFL Placement Points Calculations", () => {
    it("calculates correct points for 1st place (Grand Final winner)", () => {
      const points = calculateFantasyPoints(1, DEFAULT_SCORING);
      expect(points).toBe(100);
    });

    it("calculates correct points for 2nd place (Grand Final loser)", () => {
      const points = calculateFantasyPoints(2, DEFAULT_SCORING);
      expect(points).toBe(70);
    });

    it("calculates correct averaged points for 3rd-4th (Preliminary Finals losers)", () => {
      // Two teams lose Prelim Finals, share 3rd and 4th
      const points = calculateAveragedPoints([3, 4], DEFAULT_SCORING);
      expect(points).toBe(45); // (50 + 40) / 2
    });

    it("calculates correct averaged points for 5th-6th (Semi-Finals losers)", () => {
      // Two teams lose Semi-Finals, share 5th and 6th
      const points = calculateAveragedPoints([5, 6], DEFAULT_SCORING);
      expect(points).toBe(25); // (25 + 25) / 2
    });

    it("calculates correct averaged points for 7th-8th (Elimination Finals losers)", () => {
      // Two teams lose Elimination Finals, share 7th and 8th
      const points = calculateAveragedPoints([7, 8], DEFAULT_SCORING);
      expect(points).toBe(15); // (15 + 15) / 2
    });

    it("returns 0 points for Wildcard Round losers (9th-10th)", () => {
      // Two teams lose Wildcard Round, eliminated before scoring begins
      const points = calculateFantasyPoints(0, DEFAULT_SCORING);
      expect(points).toBe(0);
    });
  });

  describe("AFL Finals Progression", () => {
    it("has correct round progression for top 6 teams", () => {
      // Top 6 teams (1-6) skip Wildcard Round
      // QF winners (1-4) skip Semi-Finals and go straight to Preliminary Finals
      // QF losers (from 1-4) get second chance in Semi-Finals

      expect(AFL_10.rounds[1].name).toBe("Qualifying Finals"); // Top 4 play here
      expect(AFL_10.rounds[1].feedsInto).toBe("Preliminary Finals"); // Winners bypass SF
    });

    it("has correct round progression for wildcard teams", () => {
      // Teams 7-10 play Wildcard Round
      // Winners advance to Elimination Finals
      // Losers eliminated (0 points)

      expect(AFL_10.rounds[0].name).toBe("Wildcard Round");
      expect(AFL_10.rounds[0].feedsInto).toBe("Elimination Finals");
      expect(AFL_10.rounds[0].isScoring).toBe(false);
    });

    it("has correct double-chance system structure", () => {
      // Qualifying Finals losers go to Semi-Finals (second chance)
      // Elimination Finals winners go to Semi-Finals
      // This creates the "double chance" for top 4 teams

      const qfRound = AFL_10.rounds.find(r => r.name === "Qualifying Finals");
      const sfRound = AFL_10.rounds.find(r => r.name === "Semi-Finals");

      expect(qfRound?.isScoring).toBe(false); // Losers not eliminated
      expect(sfRound?.name).toBe("Semi-Finals");
    });
  });

  describe("AFL Point Distribution", () => {
    it("has all 8 scoring placements covered", () => {
      // Count scoring rounds
      const scoringRounds = AFL_10.rounds.filter(r => r.isScoring);
      expect(scoringRounds).toHaveLength(4); // EF, SF, PF, GF

      // Total teams eliminated in scoring rounds: 2 + 2 + 2 + 2 = 8 teams get points
      const totalScoringTeams = scoringRounds.reduce((sum, round) => {
        // Each match has 2 participants, losers get points (except GF winner also gets points)
        return sum + round.matchCount * 2;
      }, 0);

      expect(totalScoringTeams).toBe(14); // But only 8 unique placements (some shared)
    });

    it("has 2 teams eliminated outside top 8 (Wildcard losers)", () => {
      const wildcardRound = AFL_10.rounds[0];
      expect(wildcardRound.isScoring).toBe(false);
      expect(wildcardRound.matchCount).toBe(2);

      // 2 matches = 4 teams, 2 winners advance, 2 losers eliminated (0 points)
      const eliminatedTeams = wildcardRound.matchCount; // 2 losers
      expect(eliminatedTeams).toBe(2);
    });
  });
});

describe("AFL guaranteed floors from seeding (afl_10)", () => {
  const byName = (name: string) => AFL_10.rounds.find((r) => r.name === name);

  describe("getBracketEntryFloor — banked the moment the bracket is set", () => {
    it("gives seeds 1-4 the 5th-6th tier: the double chance is locked in at seeding", () => {
      // Worst case for a top-4 seed is lose the Qualifying Final, then lose the
      // Semi-Final — which is the 5th-6th tier. They can never finish below it.
      expect(getBracketEntryFloor("Qualifying Finals", "afl_10")).toBe(5);
      expect(calculateBracketPoints(5, DEFAULT_SCORING, "afl_10")).toBe(25);
    });

    it("gives seeds 5-6 the 7th-8th tier: they are seeded straight into a scoring round", () => {
      expect(getBracketEntryFloor("Elimination Finals", "afl_10")).toBe(7);
      expect(calculateBracketPoints(7, DEFAULT_SCORING, "afl_10")).toBe(15);
    });

    it("gives seeds 7-10 nothing: a Wildcard loss is worth 0", () => {
      expect(getBracketEntryFloor("Wildcard Round", "afl_10")).toBeNull();
    });

    it("returns null when the template is unknown or missing", () => {
      expect(getBracketEntryFloor("Qualifying Finals", null)).toBeNull();
      expect(getBracketEntryFloor("Qualifying Finals", "not_a_template")).toBeNull();
    });

    it("does not hand out floors for TBD rounds nobody is seeded into yet", () => {
      // These rounds do carry a loser tier, but every slot is empty at generation,
      // so applyBracketEntryFloors has no participant to write against.
      expect(byName("Semi-Finals")?.entryFloor).toBeUndefined();
      expect(byName("Preliminary Finals")?.entryFloor).toBeUndefined();
    });
  });

  describe("nonScoringWinnerFloor — the generic top-8 default is wrong for both AFL non-scoring rounds", () => {
    it("Qualifying Finals winners bank 3, not 5 — the bye means a Prelim loss is 3rd-4th", () => {
      expect(byName("Qualifying Finals")?.nonScoringWinnerFloor).toBe(3);
    });

    it("Wildcard winners bank 7, not 5 — winning only buys an Elimination Final", () => {
      expect(byName("Wildcard Round")?.nonScoringWinnerFloor).toBe(7);
    });
  });

  describe("floors only ever improve along every AFL path", () => {
    const pts = (position: number) => calculateBracketPoints(position, DEFAULT_SCORING, "afl_10");

    it("top-4 seed: entry 5 → QF win 3 → PF win 2 → GF win 1", () => {
      expect(pts(5)).toBeLessThan(pts(3));
      expect(pts(3)).toBeLessThan(pts(2));
      expect(pts(2)).toBeLessThan(pts(1));
    });

    it("top-4 seed losing the QF holds the entry floor, then finalizes at 5th-6th", () => {
      // QF losers advance to the Semi-Final, so nothing is written at the QF —
      // the entry floor of 5 carries them until the Semi-Final resolves.
      const entryFloor = getBracketEntryFloor("Qualifying Finals", "afl_10");
      expect(entryFloor).toBe(5);
      expect(pts(entryFloor ?? 0)).toBe(25); // unchanged by the loss
    });

    it("seeds 5-6 and Wildcard winners share a 7th-8th floor, below the top-4's", () => {
      expect(pts(7)).toBeLessThan(pts(5));
    });
  });
});