import { describe, expect, it } from "vitest";
import {
  selectActiveIpsByMode,
  type LbIpRow,
  type LbTargetConfig,
} from "../src/services/service-config-service.js";

function row(
  ip: string,
  opts: Partial<Pick<LbIpRow, "weight" | "priority" | "health">> = {},
): LbIpRow {
  return {
    ip,
    weight: opts.weight ?? 1,
    priority: opts.priority ?? 1,
    health: opts.health ?? "up",
  };
}

describe("selectActiveIpsByMode", () => {
  it("round_robin returns all healthy ips, falls back to all if none healthy", () => {
    const config: LbTargetConfig = {
      lb_mode: "round_robin",
      health_check_enabled: true,
    };
    const rows = [
      row("1.1.1.1", { health: "up" }),
      row("2.2.2.2", { health: "down" }),
      row("3.3.3.3", { health: "up" }),
    ];
    expect(selectActiveIpsByMode(config, rows).sort()).toEqual([
      "1.1.1.1",
      "3.3.3.3",
    ]);
  });

  it("round_robin returns all ips when none checked (unknown)", () => {
    const config: LbTargetConfig = {
      lb_mode: "round_robin",
      health_check_enabled: true,
    };
    const rows = [row("1.1.1.1", { health: "unknown" }), row("2.2.2.2")];
    expect(selectActiveIpsByMode(config, rows).sort()).toEqual([
      "1.1.1.1",
      "2.2.2.2",
    ]);
  });

  it("failover returns only min-priority healthy ips", () => {
    const config: LbTargetConfig = {
      lb_mode: "failover",
      health_check_enabled: true,
    };
    const rows = [
      row("1.1.1.1", { priority: 1, health: "up" }),
      row("2.2.2.2", { priority: 2, health: "up" }),
      row("3.3.3.3", { priority: 1, health: "down" }),
    ];
    expect(selectActiveIpsByMode(config, rows)).toEqual(["1.1.1.1"]);
  });

  it("failover falls back to min-priority ip among all when none healthy", () => {
    const config: LbTargetConfig = {
      lb_mode: "failover",
      health_check_enabled: true,
    };
    const rows = [
      row("1.1.1.1", { priority: 3, health: "down" }),
      row("2.2.2.2", { priority: 1, health: "down" }),
      row("3.3.3.3", { priority: 2, health: "down" }),
    ];
    expect(selectActiveIpsByMode(config, rows)).toEqual(["2.2.2.2"]);
  });

  it("weighted returns all healthy ips (one A per ip; weights stored for display)", () => {
    const config: LbTargetConfig = {
      lb_mode: "weighted",
      health_check_enabled: true,
    };
    const rows = [
      row("1.1.1.1", { weight: 3, health: "up" }),
      row("2.2.2.2", { weight: 1, health: "up" }),
      row("3.3.3.3", { weight: 2, health: "down" }),
    ];
    expect(selectActiveIpsByMode(config, rows).sort()).toEqual([
      "1.1.1.1",
      "2.2.2.2",
    ]);
  });

  it("returns empty array for no rows", () => {
    const config: LbTargetConfig = {
      lb_mode: "round_robin",
      health_check_enabled: true,
    };
    expect(selectActiveIpsByMode(config, [])).toEqual([]);
  });
});