import { describe, it, expect, vi, beforeEach } from "vitest";
import { sendDiscordWebhook, sendStandingsUpdateNotification, sendDraftOrderNotification, sendPickAnnouncementNotification } from "../discord";

const WEBHOOK_URL = "https://discord.com/api/webhooks/123/abc";

function mockFetch(status: number, body = "") {
  return vi.fn().mockResolvedValue({
    ok: status >= 200 && status < 300,
    status,
    text: async () => body,
  });
}

function getDescription(): string {
  const body = JSON.parse(
    (fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body
  );
  return body.embeds[0].description as string;
}

function getPayload(): ReturnType<typeof JSON.parse> {
  return JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
}

describe("sendDiscordWebhook", () => {
  beforeEach(() => {
    vi.stubGlobal("fetch", mockFetch(204));
  });

  it("POSTs JSON to the webhook URL", async () => {
    await sendDiscordWebhook(WEBHOOK_URL, { content: "hello" });

    expect(fetch).toHaveBeenCalledWith(WEBHOOK_URL, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ content: "hello" }),
    });
  });

  it("throws on non-2xx response", async () => {
    vi.stubGlobal("fetch", mockFetch(400, "Bad Request"));

    await expect(sendDiscordWebhook(WEBHOOK_URL, {})).rejects.toThrow(
      "Discord webhook failed: 400"
    );
  });
});

describe("sendStandingsUpdateNotification", () => {
  beforeEach(() => {
    vi.stubGlobal("fetch", mockFetch(204));
  });

  it("sends an embed with the season name as title", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 150, rank: 1 }],
      previousStandings: new Map([["a", 125]]),
    });

    const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
    expect(body.embeds[0].title).toBe("📊 Standings Update — My League 2025");
  });

  it("shows point deltas as integers in standings changes", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "Test League",
      standings: [
        { teamId: "a", teamName: "Alpha", totalPoints: 150, rank: 1 },
        { teamId: "b", teamName: "Beta", totalPoints: 100, rank: 2 },
      ],
      previousStandings: new Map([
        ["a", 125],
        ["b", 100],
      ]),
    });

    const desc = getDescription();
    expect(desc).toContain("Alpha");
    expect(desc).toContain("+25 pts");
    expect(desc).not.toContain("+25.0");
    // Beta didn't change — not shown in standings changes
    expect(desc).not.toContain("Beta");
  });

  it("includes sport name and event name in header when both provided", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      sportName: "UEFA Champions League",
      eventName: "Knockout Stage",
    });

    const desc = getDescription();
    expect(desc).toContain("UEFA Champions League — Knockout Stage");
  });

  it("shows only event name when no sport name provided", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      eventName: "Quarter Finals",
    });

    const desc = getDescription();
    expect(desc).toContain("Quarter Finals");
    expect(desc).not.toContain("—\n");
  });

  it("omits header section when neither sport name nor event name provided", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
    });

    const desc = getDescription();
    expect(desc).toContain("**Standings Changes**");
    expect(desc).not.toContain("**Scored Matches**");
  });

  it("lists scored matches above standings changes", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      scoredMatches: [
        { winnerName: "Real Madrid", loserName: "Bayern Munich", winnerUsername: "manager1" },
        { winnerName: "Arsenal", loserName: "PSG", loserUsername: "manager2" },
      ],
    });

    const desc = getDescription();
    expect(desc).toContain("**Scored Matches**");
    expect(desc).toContain("• **Real Madrid (manager1)** def. Bayern Munich");
    expect(desc).toContain("• **Arsenal** def. PSG (manager2)");
    // Scored matches section should appear before standings
    expect(desc.indexOf("Scored Matches")).toBeLessThan(desc.indexOf("Standings Changes"));
  });

  it("shows username in parentheses in standings changes when provided", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Alpha FC", username: "christhrowsrocks", totalPoints: 150, rank: 1 },
        { teamId: "b", teamName: "Beta United", totalPoints: 100, rank: 2 },
      ],
      previousStandings: new Map([
        ["a", 125],
        ["b", 100],
      ]),
    });

    const desc = getDescription();
    expect(desc).toContain("1\\. Alpha FC (christhrowsrocks) — 150 pts");
    // Beta didn't change points or rank, so it's not shown
    expect(desc).not.toContain("Beta United");
  });

  it("shows usernames in parentheses in match results when both are drafted", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      scoredMatches: [
        {
          winnerName: "Sporting",
          loserName: "Bodø/Glimt",
          winnerUsername: "christhrowsrocks",
          loserUsername: "apatel",
        },
      ],
    });

    const desc = getDescription();
    expect(desc).toContain("• **Sporting (christhrowsrocks)** def. Bodø/Glimt (apatel)");
  });

  it("omits scored matches where neither side has a username", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      scoredMatches: [{ winnerName: "Real Madrid", loserName: "Bayern Munich" }],
    });

    const desc = getDescription();
    expect(desc).not.toContain("**Scored Matches**");
    expect(desc).not.toContain("Real Madrid");
    expect(desc).not.toContain("Bayern Munich");
  });

  it("omits username parenthesis only for the undrafted side in match results", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      scoredMatches: [
        {
          winnerName: "Sporting",
          loserName: "Bodø/Glimt",
          winnerUsername: "christhrowsrocks",
        },
      ],
    });

    const desc = getDescription();
    expect(desc).toContain("• **Sporting (christhrowsrocks)** def. Bodø/Glimt");
    expect(desc).not.toContain("Bodø/Glimt (");
  });

  it("shows teams that changed rank even without a point change", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Alpha", totalPoints: 150, rank: 1 },
        { teamId: "b", teamName: "Beta", totalPoints: 125, rank: 2 },
        { teamId: "c", teamName: "Gamma", totalPoints: 100, rank: 3 },
      ],
      previousStandings: new Map([
        ["a", 125],
        ["b", 125],
        ["c", 100],
      ]),
      previousRanks: new Map([
        ["a", 2],
        ["b", 1],
        ["c", 3],
      ]),
    });

    const desc = getDescription();
    // Alpha gained points and moved up
    expect(desc).toContain("Alpha");
    expect(desc).toContain("+25 pts");
    expect(desc).toContain("↑1");
    // Beta didn't gain points but was displaced — rank changed
    expect(desc).toContain("Beta");
    expect(desc).toContain("↓1");
    // Gamma unchanged — not shown
    expect(desc).not.toContain("Gamma");
  });

  it("omits rank delta when no previousRanks provided", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Alpha", totalPoints: 150, rank: 1 },
      ],
      previousStandings: new Map([["a", 125]]),
    });

    const desc = getDescription();
    expect(desc).toContain("Alpha");
    expect(desc).not.toContain("↑");
    expect(desc).not.toContain("↓");
  });

  it("escapes Discord markdown characters in team names and usernames", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Team__Underline", username: "user__name", totalPoints: 150, rank: 1 },
      ],
      previousStandings: new Map([["a", 125]]),
      scoredMatches: [
        {
          winnerName: "Winner*Bold*",
          loserName: "Loser~Strike~",
          winnerUsername: "user_one",
          loserUsername: "user_two",
        },
      ],
    });

    const desc = getDescription();
    expect(desc).toContain("Team\\_\\_Underline");
    expect(desc).toContain("user\\_\\_name");
    expect(desc).toContain("Winner\\*Bold\\*");
    expect(desc).toContain("Loser\\~Strike\\~");
    expect(desc).toContain("user\\_one");
    expect(desc).toContain("user\\_two");
  });

  it("uses Discord mention in standings for opted-in user", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        {
          teamId: "a",
          teamName: "Alpha FC",
          username: "christhrowsrocks",
          discordUserId: "111222333",
          totalPoints: 150,
          rank: 1,
        },
      ],
      previousStandings: new Map([["a", 125]]),
    });

    const desc = getDescription();
    expect(desc).toContain("Alpha FC (<@111222333>)");
    expect(desc).not.toContain("christhrowsrocks");
  });

  it("uses Discord mention in scored match for opted-in winner", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
      scoredMatches: [
        {
          winnerName: "Real Madrid",
          loserName: "Bayern Munich",
          winnerUsername: "manager1",
          winnerDiscordUserId: "111222333",
          loserUsername: "manager2",
        },
      ],
    });

    const desc = getDescription();
    expect(desc).toContain("Real Madrid (<@111222333>)");
    expect(desc).not.toContain("manager1");
    expect(desc).toContain("Bayern Munich (manager2)");
  });

  it("sets content and allowed_mentions when opted-in users are present", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        {
          teamId: "a",
          teamName: "Alpha FC",
          username: "christhrowsrocks",
          discordUserId: "111222333",
          totalPoints: 150,
          rank: 1,
        },
      ],
      previousStandings: new Map([["a", 125]]),
    });

    const payload = getPayload();
    expect(payload.content).toBe("<@111222333>");
    expect(payload.allowed_mentions).toEqual({ parse: [], users: ["111222333"] });
  });

  it("omits content and allowed_mentions when no users opted in", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Alpha FC", username: "christhrowsrocks", totalPoints: 150, rank: 1 },
      ],
      previousStandings: new Map([["a", 125]]),
    });

    const payload = getPayload();
    expect(payload.content).toBeUndefined();
    expect(payload.allowed_mentions).toBeUndefined();
  });

  it("collects Discord IDs from both standings and scored matches", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Alpha", username: "user1", discordUserId: "111", totalPoints: 150, rank: 1 },
      ],
      previousStandings: new Map([["a", 125]]),
      scoredMatches: [
        {
          winnerName: "Real Madrid",
          loserName: "Bayern Munich",
          winnerUsername: "user2",
          winnerDiscordUserId: "222",
          loserUsername: "user1",
          loserDiscordUserId: "111",
        },
      ],
    });

    const payload = getPayload();
    const ids: string[] = payload.allowed_mentions.users;
    expect(ids).toHaveLength(2);
    expect(ids).toContain("111");
    expect(ids).toContain("222");
  });

  it("does not show fields on the embed", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [{ teamId: "a", teamName: "Alpha", totalPoints: 125, rank: 1 }],
      previousStandings: new Map([["a", 100]]),
    });

    const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
    expect(body.embeds[0].fields).toBeUndefined();
  });

  it("omits standings changes section when no teams changed", async () => {
    await sendStandingsUpdateNotification({
      webhookUrl: WEBHOOK_URL,
      seasonName: "My League 2025",
      standings: [
        { teamId: "a", teamName: "Alpha", totalPoints: 100, rank: 1 },
        { teamId: "b", teamName: "Beta", totalPoints: 75, rank: 2 },
      ],
      previousStandings: new Map([
        ["a", 100],
        ["b", 75],
      ]),
      previousRanks: new Map([
        ["a", 1],
        ["b", 2],
      ]),
    });

    const desc = getDescription();
    expect(desc).not.toContain("**Standings Changes**");
    expect(desc).not.toContain("Alpha");
    expect(desc).not.toContain("Beta");
  });
});

describe("sendDraftOrderNotification", () => {
  beforeEach(() => {
    vi.stubGlobal("fetch", mockFetch(204));
  });

  it("uses '📋 Draft Order Manually Set' title for manual method", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [{ name: "Team Alpha", position: 1 }],
    });

    const payload = getPayload();
    expect(payload.embeds[0].title).toBe("Draft Order Manually Set — My League");
  });

  it("uses '🎲 Draft Order Randomized' title for randomized method", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "randomized",
      teams: [{ name: "Team Alpha", position: 1 }],
    });

    const payload = getPayload();
    expect(payload.embeds[0].title).toBe("Draft Order Randomized — My League");
  });

  it("links the embed title to the league URL", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [{ name: "Team Alpha", position: 1 }],
    });

    const payload = getPayload();
    expect(payload.embeds[0].url).toBe("https://brackt.com/leagues/abc");
  });

  it("renders a numbered list of teams sorted by position", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [
        { name: "Team Gamma", position: 3 },
        { name: "Team Alpha", position: 1 },
        { name: "Team Beta", position: 2 },
      ],
    });

    const payload = getPayload();
    expect(payload.embeds[0].description).toBe(
      "1. Team Alpha\n2. Team Beta\n3. Team Gamma"
    );
  });

  it("shows username in parentheses next to team name when provided", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [
        { name: "Team Alpha", position: 1, username: "chris" },
        { name: "Team Beta", position: 2 },
      ],
    });

    const payload = getPayload();
    expect(payload.embeds[0].description).toContain("1. Team Alpha (chris)");
    expect(payload.embeds[0].description).toContain("2. Team Beta");
    expect(payload.embeds[0].description).not.toContain("2. Team Beta (");
  });

  it("escapes Discord markdown in team names and usernames", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [
        { name: "Team__Underline", position: 1, username: "user__name" },
        { name: "Team*Bold*", position: 2 },
      ],
    });

    const payload = getPayload();
    expect(payload.embeds[0].description).toContain("Team\\_\\_Underline");
    expect(payload.embeds[0].description).toContain("user\\_\\_name");
    expect(payload.embeds[0].description).toContain("Team\\*Bold\\*");
  });

  it("uses color 0x5865f2 and has no footer", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [{ name: "Team Alpha", position: 1 }],
    });

    const payload = getPayload();
    expect(payload.embeds[0].color).toBe(0x5865f2);
    expect(payload.embeds[0].footer).toBeUndefined();
  });

  it("does not set content or allowed_mentions", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [{ name: "Team Alpha", position: 1 }],
    });

    const payload = getPayload();
    expect(payload.content).toBeUndefined();
    expect(payload.allowed_mentions).toBeUndefined();
  });

  it("renders bare team names with no trailing parentheses when no team has an owner", async () => {
    await sendDraftOrderNotification({
      webhookUrl: WEBHOOK_URL,
      leagueName: "My League",
      leagueUrl: "https://brackt.com/leagues/abc",
      method: "manual",
      teams: [
        { name: "Team Alpha", position: 1 },
        { name: "Team Beta", position: 2 },
      ],
    });

    const payload = getPayload();
    expect(payload.embeds[0].description).toBe("1. Team Alpha\n2. Team Beta");
    expect(payload.embeds[0].description).not.toContain("(");
  });
});

describe("sendPickAnnouncementNotification", () => {
  const BASE = {
    webhookUrl: WEBHOOK_URL,
    draftUrl: "https://brackt.com/leagues/abc/draft/season-1",
    pickNumber: 5,
    round: 1,
    pickInRound: 5,
    pickedTeamName: "Alpha FC",
    participantName: "Erling Haaland",
    sportName: "Soccer",
    isDraftComplete: false,
  };

  beforeEach(() => {
    vi.stubGlobal("fetch", mockFetch(204));
  });

  it("sets embed title with pick and round info", async () => {
    await sendPickAnnouncementNotification(BASE);
    const payload = getPayload();
    expect(payload.embeds[0].title).toBe("Pick #5 — Round 1, Pick 5");
  });

  it("sets embed url to the draft room link", async () => {
    await sendPickAnnouncementNotification(BASE);
    const payload = getPayload();
    expect(payload.embeds[0].url).toBe(BASE.draftUrl);
  });

  it("description contains team, participant, and sport", async () => {
    await sendPickAnnouncementNotification(BASE);
    const desc = getDescription();
    expect(desc).toContain("**Alpha FC**");
    expect(desc).toContain("**Erling Haaland**");
    expect(desc).toContain("(Soccer)");
  });

  it("uses Discord blurple color and no footer", async () => {
    await sendPickAnnouncementNotification(BASE);
    const payload = getPayload();
    expect(payload.embeds[0].color).toBe(0x5865f2);
    expect(payload.embeds[0].footer).toBeUndefined();
  });

  it("shows next team when provided", async () => {
    await sendPickAnnouncementNotification({ ...BASE, nextTeamName: "Beta United" });
    const desc = getDescription();
    expect(desc).toContain("On the clock: **Beta United**");
  });

  it("pings next owner with Discord mention when Discord ID is provided", async () => {
    await sendPickAnnouncementNotification({
      ...BASE,
      nextTeamName: "Beta United",
      nextOwnerDiscordId: "999888777",
    });
    const desc = getDescription();
    expect(desc).toContain("<@999888777>");
    const payload = getPayload();
    expect(payload.content).toBe("<@999888777>");
    expect(payload.allowed_mentions).toEqual({ parse: [], users: ["999888777"] });
  });

  it("shows team name without mention when no Discord ID", async () => {
    await sendPickAnnouncementNotification({ ...BASE, nextTeamName: "Beta United" });
    const payload = getPayload();
    expect(payload.content).toBeUndefined();
    expect(payload.allowed_mentions).toBeUndefined();
  });

  it("shows draft complete message when isDraftComplete is true", async () => {
    await sendPickAnnouncementNotification({ ...BASE, isDraftComplete: true });
    const desc = getDescription();
    expect(desc).toContain("The draft is complete!");
    expect(desc).not.toContain("On the clock");
    const payload = getPayload();
    expect(payload.content).toBeUndefined();
    expect(payload.allowed_mentions).toBeUndefined();
  });

  it("escapes markdown in team and participant names", async () => {
    await sendPickAnnouncementNotification({
      ...BASE,
      pickedTeamName: "Alpha_FC",
      participantName: "Player*Name",
      sportName: "E-Sports",
    });
    const desc = getDescription();
    expect(desc).toContain("Alpha\\_FC");
    expect(desc).toContain("Player\\*Name");
  });
});