import { describe, it, expect } from "bun:test";
import { buildTransactionHistory } from "../src/events.js";
import type {
  WalletData,
  TokenData,
  HistoryEntry,
  TransactionRecord,
} from "../src/types.js";

describe("buildTransactionHistory", () => {
  const emptyWallet: WalletData = { mints: [], privkey: "" };

  it("should build records from history events", () => {
    const history: HistoryEntry[] = [
      {
        direction: "in",
        amount: "100",
        unit: "sat",
        eventId: "evt1",
        createdAt: 1000,
        referencedEvents: [],
      },
      {
        direction: "out",
        amount: "50",
        unit: "sat",
        eventId: "evt2",
        createdAt: 2000,
        referencedEvents: [],
      },
    ];

    const records = buildTransactionHistory(emptyWallet, [], history, [], []);

    expect(records).toHaveLength(2);
    expect(records[0].type).toBe("receive");
    expect(records[0].amount).toBe(100);
    expect(records[1].type).toBe("send");
    expect(records[1].amount).toBe(50);
  });

  it("should deduplicate by event ID across sources", () => {
    const history: HistoryEntry[] = [
      {
        direction: "in",
        amount: "100",
        unit: "sat",
        eventId: "same-id",
        createdAt: 1000,
        referencedEvents: [],
      },
    ];
    const nutzaps: TransactionRecord[] = [
      {
        date: "2025-01-01T00:00:00Z",
        type: "zap",
        amount: 100,
        unit: "sat",
        mint: "",
        token_id: "same-id",
        memo: "",
      },
    ];

    const records = buildTransactionHistory(
      emptyWallet,
      [],
      history,
      nutzaps,
      []
    );
    expect(records).toHaveLength(1);
  });

  it("should fall back to token events when no history events exist", () => {
    const tokens: TokenData[] = [
      {
        mint: "https://mint.example",
        unit: "sat",
        proofs: [{ id: "p1", amount: 64, secret: "s", C: "c" }],
        eventId: "tok1",
        createdAt: 1000,
      },
    ];

    const records = buildTransactionHistory(emptyWallet, tokens, [], [], []);
    expect(records).toHaveLength(1);
    expect(records[0].amount).toBe(64);
    expect(records[0].type).toBe("receive");
  });

  it("should NOT use token events when history events exist", () => {
    const tokens: TokenData[] = [
      {
        mint: "https://mint.example",
        unit: "sat",
        proofs: [{ id: "p1", amount: 64, secret: "s", C: "c" }],
        eventId: "tok1",
        createdAt: 1000,
      },
    ];
    const history: HistoryEntry[] = [
      {
        direction: "in",
        amount: "100",
        unit: "sat",
        eventId: "evt1",
        createdAt: 2000,
        referencedEvents: [],
      },
    ];

    const records = buildTransactionHistory(
      emptyWallet,
      tokens,
      history,
      [],
      []
    );
    expect(records).toHaveLength(1);
    expect(records[0].token_id).toBe("evt1");
  });

  it("should sort records by date ascending", () => {
    const nutzaps: TransactionRecord[] = [
      {
        date: new Date(3000 * 1000).toISOString(),
        type: "zap",
        amount: 10,
        unit: "sat",
        mint: "",
        token_id: "z1",
        memo: "",
      },
      {
        date: new Date(1000 * 1000).toISOString(),
        type: "zap",
        amount: 20,
        unit: "sat",
        mint: "",
        token_id: "z2",
        memo: "",
      },
    ];

    const records = buildTransactionHistory(
      emptyWallet,
      [],
      [],
      nutzaps,
      []
    );
    expect(records[0].token_id).toBe("z2");
    expect(records[1].token_id).toBe("z1");
  });

  it("should handle non-numeric amount gracefully (defaults to 0)", () => {
    const history: HistoryEntry[] = [
      {
        direction: "in",
        amount: "not-a-number",
        unit: "sat",
        eventId: "evt1",
        createdAt: 1000,
        referencedEvents: [],
      },
    ];

    const records = buildTransactionHistory(emptyWallet, [], history, [], []);
    expect(records[0].amount).toBe(0);
  });

  it("should merge nutzaps and redemptions with history", () => {
    const history: HistoryEntry[] = [
      {
        direction: "in",
        amount: "100",
        unit: "sat",
        eventId: "h1",
        createdAt: 1000,
        referencedEvents: [],
      },
    ];
    const nutzaps: TransactionRecord[] = [
      {
        date: new Date(2000 * 1000).toISOString(),
        type: "zap",
        amount: 50,
        unit: "sat",
        mint: "",
        token_id: "z1",
        memo: "",
      },
    ];
    const redemptions: TransactionRecord[] = [
      {
        date: new Date(3000 * 1000).toISOString(),
        type: "receive",
        amount: 50,
        unit: "sat",
        mint: "",
        token_id: "r1",
        memo: "nutzap redemption",
      },
    ];

    const records = buildTransactionHistory(
      emptyWallet,
      [],
      history,
      nutzaps,
      redemptions
    );
    expect(records).toHaveLength(3);
    expect(records[0].token_id).toBe("h1");
    expect(records[1].token_id).toBe("z1");
    expect(records[2].token_id).toBe("r1");
  });
});