import { describe, expect, test, beforeEach, afterEach, mock } from "bun:test";

// Mock heavy dependencies to avoid import chain issues
mock.module("src/utils/thinking.js", () => ({
  isUltrathinkEnabled: () => false,
}));
mock.module("src/utils/settings/settings.js", () => ({
  getInitialSettings: () => ({}),
}));
mock.module("src/utils/auth.js", () => ({
  isProSubscriber: () => false,
  isMaxSubscriber: () => false,
  isTeamSubscriber: () => false,
}));
mock.module("src/services/analytics/growthbook.js", () => ({
  getFeatureValue_CACHED_MAY_BE_STALE: () => null,
}));
mock.module("src/utils/model/modelSupportOverrides.js", () => ({
  get3PModelCapabilityOverride: () => undefined,
}));

const {
  isEffortLevel,
  parseEffortValue,
  isValidNumericEffort,
  convertEffortValueToLevel,
  getEffortLevelDescription,
  resolvePickerEffortPersistence,
  EFFORT_LEVELS,
} = await import("src/utils/effort.js");

// ─── EFFORT_LEVELS constant ────────────────────────────────────────────

describe("EFFORT_LEVELS", () => {
  test("contains the four canonical levels", () => {
    expect(EFFORT_LEVELS).toEqual(["low", "medium", "high", "max"]);
  });
});

// ─── isEffortLevel ─────────────────────────────────────────────────────

describe("isEffortLevel", () => {
  test("returns true for 'low'", () => {
    expect(isEffortLevel("low")).toBe(true);
  });

  test("returns true for 'medium'", () => {
    expect(isEffortLevel("medium")).toBe(true);
  });

  test("returns true for 'high'", () => {
    expect(isEffortLevel("high")).toBe(true);
  });

  test("returns true for 'max'", () => {
    expect(isEffortLevel("max")).toBe(true);
  });

  test("returns false for 'invalid'", () => {
    expect(isEffortLevel("invalid")).toBe(false);
  });

  test("returns false for empty string", () => {
    expect(isEffortLevel("")).toBe(false);
  });
});

// ─── parseEffortValue ──────────────────────────────────────────────────

describe("parseEffortValue", () => {
  test("returns undefined for undefined", () => {
    expect(parseEffortValue(undefined)).toBeUndefined();
  });

  test("returns undefined for null", () => {
    expect(parseEffortValue(null)).toBeUndefined();
  });

  test("returns undefined for empty string", () => {
    expect(parseEffortValue("")).toBeUndefined();
  });

  test("returns number for integer input", () => {
    expect(parseEffortValue(42)).toBe(42);
  });

  test("returns string for valid effort level string", () => {
    expect(parseEffortValue("low")).toBe("low");
    expect(parseEffortValue("medium")).toBe("medium");
    expect(parseEffortValue("high")).toBe("high");
    expect(parseEffortValue("max")).toBe("max");
  });

  test("parses numeric string to number", () => {
    expect(parseEffortValue("42")).toBe(42);
  });

  test("returns undefined for invalid string", () => {
    expect(parseEffortValue("invalid")).toBeUndefined();
  });

  test("non-integer number falls through to string parsing (parseInt truncates)", () => {
    // 3.14 fails isValidNumericEffort, then String(3.14) -> "3.14" -> parseInt = 3
    expect(parseEffortValue(3.14)).toBe(3);
  });

  test("handles case-insensitive effort level strings", () => {
    expect(parseEffortValue("LOW")).toBe("low");
    expect(parseEffortValue("HIGH")).toBe("high");
  });
});

// ─── isValidNumericEffort ──────────────────────────────────────────────

describe("isValidNumericEffort", () => {
  test("returns true for integer", () => {
    expect(isValidNumericEffort(50)).toBe(true);
  });

  test("returns true for zero", () => {
    expect(isValidNumericEffort(0)).toBe(true);
  });

  test("returns true for negative integer", () => {
    expect(isValidNumericEffort(-1)).toBe(true);
  });

  test("returns false for float", () => {
    expect(isValidNumericEffort(3.14)).toBe(false);
  });

  test("returns false for NaN", () => {
    expect(isValidNumericEffort(NaN)).toBe(false);
  });

  test("returns false for Infinity", () => {
    expect(isValidNumericEffort(Infinity)).toBe(false);
  });
});

// ─── convertEffortValueToLevel ─────────────────────────────────────────

describe("convertEffortValueToLevel", () => {
  test("returns valid effort level string as-is", () => {
    expect(convertEffortValueToLevel("low")).toBe("low");
    expect(convertEffortValueToLevel("medium")).toBe("medium");
    expect(convertEffortValueToLevel("high")).toBe("high");
    expect(convertEffortValueToLevel("max")).toBe("max");
  });

  test("returns 'high' for unknown string", () => {
    expect(convertEffortValueToLevel("unknown" as any)).toBe("high");
  });

  test("non-ant numeric value returns 'high'", () => {
    const saved = process.env.USER_TYPE;
    delete process.env.USER_TYPE;

    expect(convertEffortValueToLevel(50)).toBe("high");
    expect(convertEffortValueToLevel(100)).toBe("high");

    process.env.USER_TYPE = saved;
  });

  describe("ant numeric mapping", () => {
    let savedUserType: string | undefined;

    beforeEach(() => {
      savedUserType = process.env.USER_TYPE;
      process.env.USER_TYPE = "ant";
    });

    afterEach(() => {
      if (savedUserType === undefined) {
        delete process.env.USER_TYPE;
      } else {
        process.env.USER_TYPE = savedUserType;
      }
    });

    test("value <= 50 maps to 'low'", () => {
      expect(convertEffortValueToLevel(50)).toBe("low");
      expect(convertEffortValueToLevel(0)).toBe("low");
      expect(convertEffortValueToLevel(-10)).toBe("low");
    });

    test("value 51-85 maps to 'medium'", () => {
      expect(convertEffortValueToLevel(51)).toBe("medium");
      expect(convertEffortValueToLevel(85)).toBe("medium");
    });

    test("value 86-100 maps to 'high'", () => {
      expect(convertEffortValueToLevel(86)).toBe("high");
      expect(convertEffortValueToLevel(100)).toBe("high");
    });

    test("value > 100 maps to 'max'", () => {
      expect(convertEffortValueToLevel(101)).toBe("max");
      expect(convertEffortValueToLevel(200)).toBe("max");
    });
  });
});

// ─── getEffortLevelDescription ─────────────────────────────────────────

describe("getEffortLevelDescription", () => {
  test("returns description for 'low'", () => {
    const desc = getEffortLevelDescription("low");
    expect(desc).toContain("Quick");
  });

  test("returns description for 'medium'", () => {
    const desc = getEffortLevelDescription("medium");
    expect(desc).toContain("Balanced");
  });

  test("returns description for 'high'", () => {
    const desc = getEffortLevelDescription("high");
    expect(desc).toContain("Comprehensive");
  });

  test("returns description for 'max'", () => {
    const desc = getEffortLevelDescription("max");
    expect(desc).toContain("Maximum");
  });
});

// ─── resolvePickerEffortPersistence ────────────────────────────────────

describe("resolvePickerEffortPersistence", () => {
  test("returns undefined when picked matches model default and no prior persistence", () => {
    const result = resolvePickerEffortPersistence("high", "high", undefined, false);
    expect(result).toBeUndefined();
  });

  test("returns picked when it differs from model default", () => {
    const result = resolvePickerEffortPersistence("low", "high", undefined, false);
    expect(result).toBe("low");
  });

  test("returns picked when priorPersisted is set (even if same as default)", () => {
    const result = resolvePickerEffortPersistence("high", "high", "high", false);
    expect(result).toBe("high");
  });

  test("returns picked when toggledInPicker is true (even if same as default)", () => {
    const result = resolvePickerEffortPersistence("high", "high", undefined, true);
    expect(result).toBe("high");
  });

  test("returns undefined picked value when no explicit and matches default", () => {
    const result = resolvePickerEffortPersistence(undefined, "high" as any, undefined, false);
    expect(result).toBeUndefined();
  });
});