import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import {
  resolveModelString,
  getEffectiveModel,
  CLAUDE_MODEL_MAP,
  DEFAULT_MODELS,
} from "@/lib/model-resolver.js";

describe("model-resolver.ts", () => {
  let consoleSpy: any;

  beforeEach(() => {
    consoleSpy = {
      log: vi.spyOn(console, "log").mockImplementation(() => {}),
      warn: vi.spyOn(console, "warn").mockImplementation(() => {}),
    };
  });

  afterEach(() => {
    consoleSpy.log.mockRestore();
    consoleSpy.warn.mockRestore();
  });

  describe("resolveModelString", () => {
    it("should resolve 'haiku' alias to full model string", () => {
      const result = resolveModelString("haiku");
      expect(result).toBe("claude-haiku-4-5");
    });

    it("should resolve 'sonnet' alias to full model string", () => {
      const result = resolveModelString("sonnet");
      expect(result).toBe("claude-sonnet-4-20250514");
    });

    it("should resolve 'opus' alias to full model string", () => {
      const result = resolveModelString("opus");
      expect(result).toBe("claude-opus-4-5-20251101");
      expect(consoleSpy.log).toHaveBeenCalledWith(
        expect.stringContaining('Resolved model alias: "opus"')
      );
    });

    it("should pass through OpenAI gpt-* models", () => {
      const models = ["gpt-5.2", "gpt-5.1-codex", "gpt-4"];
      models.forEach((model) => {
        const result = resolveModelString(model);
        expect(result).toBe(model);
      });
      expect(consoleSpy.log).toHaveBeenCalledWith(
        expect.stringContaining("Using OpenAI/Codex model")
      );
    });

    it("should treat o-series models as unknown (Codex CLI doesn't support them)", () => {
      const models = ["o1", "o1-mini", "o3"];
      models.forEach((model) => {
        const result = resolveModelString(model);
        // Should fall back to default since these aren't supported
        expect(result).toBe(DEFAULT_MODELS.claude);
      });
    });

    it("should pass through full Claude model strings", () => {
      const models = [
        "claude-opus-4-5-20251101",
        "claude-sonnet-4-20250514",
        "claude-haiku-4-5",
      ];
      models.forEach((model) => {
        const result = resolveModelString(model);
        expect(result).toBe(model);
      });
      expect(consoleSpy.log).toHaveBeenCalledWith(
        expect.stringContaining("Using full Claude model string")
      );
    });

    it("should return default model when modelKey is undefined", () => {
      const result = resolveModelString(undefined);
      expect(result).toBe(DEFAULT_MODELS.claude);
    });

    it("should return custom default model when provided", () => {
      const customDefault = "custom-model";
      const result = resolveModelString(undefined, customDefault);
      expect(result).toBe(customDefault);
    });

    it("should return default for unknown model key", () => {
      const result = resolveModelString("unknown-model");
      expect(result).toBe(DEFAULT_MODELS.claude);
      expect(consoleSpy.warn).toHaveBeenCalledWith(
        expect.stringContaining('Unknown model key "unknown-model"')
      );
    });

    it("should handle empty string", () => {
      const result = resolveModelString("");
      expect(result).toBe(DEFAULT_MODELS.claude);
    });
  });

  describe("getEffectiveModel", () => {
    it("should prioritize explicit model over session and default", () => {
      const result = getEffectiveModel("opus", "haiku", "gpt-5.2");
      expect(result).toBe("claude-opus-4-5-20251101");
    });

    it("should use session model when explicit is not provided", () => {
      const result = getEffectiveModel(undefined, "sonnet", "gpt-5.2");
      expect(result).toBe("claude-sonnet-4-20250514");
    });

    it("should use default when neither explicit nor session is provided", () => {
      const customDefault = "claude-haiku-4-5";
      const result = getEffectiveModel(undefined, undefined, customDefault);
      expect(result).toBe(customDefault);
    });

    it("should use Claude default when no arguments provided", () => {
      const result = getEffectiveModel();
      expect(result).toBe(DEFAULT_MODELS.claude);
    });

    it("should handle explicit empty strings as undefined", () => {
      const result = getEffectiveModel("", "haiku");
      expect(result).toBe("claude-haiku-4-5");
    });
  });

  describe("CLAUDE_MODEL_MAP", () => {
    it("should have haiku, sonnet, opus mappings", () => {
      expect(CLAUDE_MODEL_MAP).toHaveProperty("haiku");
      expect(CLAUDE_MODEL_MAP).toHaveProperty("sonnet");
      expect(CLAUDE_MODEL_MAP).toHaveProperty("opus");
    });

    it("should have valid Claude model strings", () => {
      expect(CLAUDE_MODEL_MAP.haiku).toContain("haiku");
      expect(CLAUDE_MODEL_MAP.sonnet).toContain("sonnet");
      expect(CLAUDE_MODEL_MAP.opus).toContain("opus");
    });
  });

  describe("DEFAULT_MODELS", () => {
    it("should have claude and openai defaults", () => {
      expect(DEFAULT_MODELS).toHaveProperty("claude");
      expect(DEFAULT_MODELS).toHaveProperty("openai");
    });

    it("should have valid default models", () => {
      expect(DEFAULT_MODELS.claude).toContain("claude");
      expect(DEFAULT_MODELS.openai).toContain("gpt");
    });
  });
});