import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import { test } from "node:test";
import { computeStandings, tiebreakers } from "../src/standings.ts";
import { csvRows, extract, extractMatches, isMatchExport, parseTable } from "../src/tables.ts";

const fixture = (f: string) => parseTable(readFileSync(new URL(`./fixtures/${f}`, import.meta.url), "utf8"));

test("matches export: detects shape, reads byes and null GameWins", () => {
  const rows = fixture("matches.json");
  assert.ok(isMatchExport(rows));
  assert.deepEqual(extractMatches(rows), [
    { round: 4, a: "Eve Evans", b: null, w1: 2, w2: 0, draws: 0 },
    { round: 4, a: "Alice Archer", b: "Bob Baker", w1: 2, w2: 0, draws: 0 },
    { round: 4, a: "Cara Chen", b: "Dan Doyle", w1: 1, w2: 2, draws: 0 },
  ]);
});

test("matches export: unreported matches are skipped, empty file rejected", () => {
  assert.throws(() => extractMatches([{ HasResult: false, Competitors: [] }]), /No completed matches/);
});

test("standings export: only the final round is used, real names", () => {
  const rows = fixture("standings.json");
  assert.ok(!isMatchExport(rows));
  assert.deepEqual(extract(rows).map((r) => [r.name, r.points, r.wdl]), [
    ["Alice Archer", 6, [2, 0, 0]],
    ["Bob Baker", 1, [0, 1, 1]],
  ]);
});

test("generic CSV: quoted commas, header aliases, helpful error", () => {
  assert.deepEqual(extract(parseTable('Rank,Player,Points,Deck\n1,"Bob, Jr",6,Elves\n')),
    [{ name: "Bob, Jr", points: 6, deck: "Elves", wdl: null }]);
  assert.throws(() => extract(parseTable("Rank,Foo\n1,x")), /Headers in the file: Rank, Foo/);
  assert.deepEqual(csvRows('1,"a ""q"" b",x', ","), [["1", 'a "q" b', "x"]]);
});

test("rejects non-numeric scores in uploaded JSON", () => {
  const bad = [{ Team: { Players: [{ Name: "A" }] }, RoundNumber: 1, Points: 3, MatchWins: "x", MatchDraws: 0, MatchLosses: 0 }];
  assert.throws(() => extract(bad), /Bad numbers/);
});

test("leaderboard: best-N sessions count, bye is a win, W-D-L unknown for points-only imports", () => {
  const names = new Map([[1, "Ann"], [2, "Bob"], [3, "Cy"]]);
  const ms = [
    { session_id: 1, p1_id: 1, p2_id: 2, p1_deck: "Burn", p2_deck: "Elves", p1_wins: 2, p2_wins: 1 },
    { session_id: 1, p1_id: 3, p2_id: null, p1_deck: null, p2_deck: null, p1_wins: 2, p2_wins: 0 },
  ];
  const rs = [
    { session_id: 2, player_id: 1, points: 9, deck: "Burn", wins: 3, draws: 0, losses: 0 },
    { session_id: 2, player_id: 2, points: 4, deck: null, wins: null, draws: null, losses: null },
  ];
  const { rows, decks } = computeStandings(ms, rs, names, 1);
  assert.deepEqual(rows.map((r) => [r.name, r.score, r.total, r.rec]), [
    ["Ann", 9, 12, [4, 0, 0]], // best 1 of {3, 9}
    ["Bob", 4, 4, null],
    ["Cy", 3, 3, [1, 0, 0]],
  ]);
  assert.deepEqual(decks, [["Burn", [4, 0, 0]], ["Elves", [0, 0, 1]]]);
});

test("a session with match rows ignores its imported standings", () => {
  const names = new Map([[1, "Ann"], [2, "Bob"]]);
  const ms = [{ session_id: 1, p1_id: 1, p2_id: 2, p1_deck: null, p2_deck: null, p1_wins: 2, p2_wins: 0 }];
  const rs = [{ session_id: 1, player_id: 2, points: 99, deck: null, wins: 9, draws: 0, losses: 0 }];
  assert.equal(computeStandings(ms, rs, names, 6).rows.find((r) => r.name === "Bob")!.score, 0);
});

const match = (p1_id: number, p2_id: number | null, p1_wins: number, p2_wins: number, draws = 0) =>
  ({ session_id: 1, p1_id, p2_id, p1_deck: null, p2_deck: null, p1_wins, p2_wins, draws });

test("Melee tiebreakers: a bye is a 2-0 win but not an opponent, opponents floored at 1/3", () => {
  const tb = tiebreakers([match(1, null, 2, 0), match(1, 2, 2, 1)]);
  assert.deepEqual(tb.get(1), { omw: 1 / 3, gw: 12 / 15, ogw: 1 / 3 }); // Fay went 0-1 and 1-2, both floored
  assert.deepEqual(tb.get(2), { omw: 1, gw: 1 / 3, ogw: 12 / 15 });
});

test("leaderboard: points ties fall to OMW%, then GW%, before name", () => {
  const names = new Map([[1, "Ann"], [2, "Bob"], [3, "Cy"], [4, "Dee"]]);
  const ms = [match(1, 2, 2, 0), match(3, 4, 2, 0), match(1, 3, 2, 1), match(2, 4, 2, 0)];
  const { rows } = computeStandings(ms, [], names, 6);
  // Bob and Cy: 3 points, equal OMW (Ann 100%, Dee floored to 33%); Cy's GW% 60% beats Bob's 50%
  assert.deepEqual(rows.map((r) => r.name), ["Ann", "Cy", "Bob", "Dee"]);
});