import { describe, it, expect } from "vitest";
import { readFileSync } from "node:fs";
import { join } from "node:path";
import {
  parseTennisDrawWikitext,
  parsePlayerCell,
  parseTemplateParams,
  extractTemplates,
  slugifyArticle,
  articleTitleFromInput,
} from "../wikipedia-tennis";
import type { FetchedRound } from "../types";

const FIXTURE = readFileSync(
  join(__dirname, "fixtures", "wimbledon-2025-mens-singles.wikitext"),
  "utf-8",
);
const ARTICLE = "2025 Wimbledon Championships – Men's singles";

function roundOrThrow(rounds: FetchedRound[], name: string): FetchedRound {
  const round = rounds.find((r) => r.roundName === name);
  if (!round) throw new Error(`round ${name} missing`);
  return round;
}

describe("parsePlayerCell", () => {
  it("extracts name + wikilink target and detects the bolded winner", () => {
    const cell = parsePlayerCell("'''{{flagicon|ITA}} [[Jannik Sinner]]'''");
    expect(cell).toEqual({
      player: { name: "Jannik Sinner", externalId: "Jannik Sinner", seed: null },
      isWinner: true,
    });
  });

  it("treats a non-bolded slot as a loser", () => {
    const cell = parsePlayerCell("{{flagicon|USA}} [[Ben Shelton]]");
    expect(cell?.isWinner).toBe(false);
    expect(cell?.player.name).toBe("Ben Shelton");
  });

  it("handles piped wikilinks (qualifier disambiguation)", () => {
    const cell = parsePlayerCell("{{flagicon|FRA}} [[Arthur Fils (tennis)|Arthur Fils]]");
    expect(cell?.player.name).toBe("Arthur Fils");
    expect(cell?.player.externalId).toBe("Arthur Fils (tennis)");
  });

  it("parses a player whose cell is wrapped in {{nowrap}} (long names)", () => {
    const loser = parsePlayerCell(
      "{{nowrap|{{flagicon|ESP}} [[Alejandro Davidovich Fokina|A Davidovich Fokina]]}}",
    );
    expect(loser?.player.externalId).toBe("Alejandro Davidovich Fokina");
    expect(loser?.player.name).toBe("A Davidovich Fokina");
    expect(loser?.isWinner).toBe(false);

    const winner = parsePlayerCell(
      "'''{{nowrap|{{flagicon|ARG}} [[Juan Manuel Cerúndolo|JM Cerúndolo]]}}'''",
    );
    expect(winner?.player.externalId).toBe("Juan Manuel Cerúndolo");
    expect(winner?.isWinner).toBe(true);
  });

  it("returns null for empty, Bye, and not-yet-determined placeholder slots", () => {
    expect(parsePlayerCell("")).toBeNull();
    expect(parsePlayerCell("Bye")).toBeNull();
    expect(parsePlayerCell("Qualifier")).toBeNull();
    expect(parsePlayerCell("{{flagicon|GBR}} Qualifier")).toBeNull();
    expect(parsePlayerCell("TBD")).toBeNull();
  });
});

describe("parseTemplateParams", () => {
  it("splits on top-level pipes only, preserving piped links and templates", () => {
    const params = parseTemplateParams(
      "RD1-team1={{flagicon|ITA}} [[A B|A]]|RD1-seed1=1|RD1-score1-1=6",
    );
    expect(params.get("RD1-team1")).toBe("{{flagicon|ITA}} [[A B|A]]");
    expect(params.get("RD1-seed1")).toBe("1");
    expect(params.get("RD1-score1-1")).toBe("6");
  });
});

describe("extractTemplates", () => {
  it("finds the 8 section brackets and 1 finals bracket", () => {
    expect(extractTemplates(FIXTURE, ["16TeamBracket"]).length).toBe(8);
    expect(extractTemplates(FIXTURE, ["8TeamBracket"]).length).toBe(1);
  });
});

describe("parseTennisDrawWikitext (2025 Wimbledon men's singles)", () => {
  const draw = parseTennisDrawWikitext(FIXTURE, ARTICLE);

  it("maps to the tennis_128 template", () => {
    expect(draw.templateId).toBe("tennis_128");
  });

  it("produces the full 127-match draw with correct per-round counts", () => {
    const byRound = Object.fromEntries(draw.rounds.map((r) => [r.roundName, r.matches.length]));
    expect(byRound).toEqual({
      "Round of 128": 64,
      "Round of 64": 32,
      "Round of 32": 16,
      "Round of 16": 8,
      Quarterfinals: 4,
      Semifinals: 2,
      Final: 1,
    });
    const total = draw.rounds.reduce((sum, r) => sum + r.matches.length, 0);
    expect(total).toBe(127);
  });

  it("populates both players in section rounds (not just the finals bracket)", () => {
    const r128 = roundOrThrow(draw.rounds, "Round of 128");
    // A full 128 draw has no byes — every R128 slot is filled.
    const populated = r128.matches.filter((m) => m.player1 && m.player2);
    expect(populated.length).toBe(64);
    // Section brackets abbreviate display names ("J Sinner") but the wikilink
    // target stays the full name — so externalId is the reliable key.
    const sinnerMatch = r128.matches.find(
      (m) => m.player1?.externalId === "Jannik Sinner" || m.player2?.externalId === "Jannik Sinner",
    );
    expect(sinnerMatch).toBeDefined();
    const sinner =
      sinnerMatch?.player1?.externalId === "Jannik Sinner"
        ? sinnerMatch?.player1
        : sinnerMatch?.player2;
    expect(sinner?.name).toBe("J Sinner");
    expect(sinner?.seed).toBe(1);
  });

  it("identifies Sinner as the champion (won the Final)", () => {
    const final = roundOrThrow(draw.rounds, "Final").matches[0];
    const winner = final.winner === 1 ? final.player1 : final.player2;
    expect(winner?.name).toBe("Jannik Sinner");
  });

  it("gives every match a unique externalMatchId", () => {
    const ids = draw.rounds.flatMap((r) => r.matches.map((m) => m.externalMatchId));
    expect(new Set(ids).size).toBe(ids.length);
  });

  it("records seeds for the 32 seeded players in round 1", () => {
    const r128 = roundOrThrow(draw.rounds, "Round of 128");
    const seeded = r128.matches
      .flatMap((m) => [m.player1, m.player2])
      .filter((p) => typeof p?.seed === "number");
    expect(seeded.length).toBe(32);
  });
});

describe("articleTitleFromInput", () => {
  it("extracts the title from a pasted Wikipedia URL", () => {
    expect(
      articleTitleFromInput(
        "https://en.wikipedia.org/wiki/2025_Wimbledon_Championships_%E2%80%93_Men%27s_singles",
      ),
    ).toBe("2025 Wimbledon Championships – Men's singles");
  });

  it("strips query strings and fragments", () => {
    expect(articleTitleFromInput("https://en.wikipedia.org/wiki/French_Open?action=raw#Draw")).toBe(
      "French Open",
    );
  });

  it("passes a plain title through unchanged", () => {
    expect(articleTitleFromInput("  2025 US Open – Men's singles  ")).toBe(
      "2025 US Open – Men's singles",
    );
  });
});

describe("slugifyArticle", () => {
  it("produces an id-safe slug and strips diacritics", () => {
    expect(slugifyArticle(ARTICLE)).toBe("2025-wimbledon-championships-men-s-singles");
  });
});