import { describe, expect, test } from "bun:test";
import {
  permissionRuleExtractPrefix,
  hasWildcards,
  matchWildcardPattern,
  parsePermissionRule,
  suggestionForExactCommand,
  suggestionForPrefix,
} from "../shellRuleMatching";

// ─── permissionRuleExtractPrefix ────────────────────────────────────────

describe("permissionRuleExtractPrefix", () => {
  test("extracts prefix from legacy :* syntax", () => {
    expect(permissionRuleExtractPrefix("npm:*")).toBe("npm");
  });

  test("extracts multi-word prefix", () => {
    expect(permissionRuleExtractPrefix("git commit:*")).toBe("git commit");
  });

  test("returns null for non-prefix rule", () => {
    expect(permissionRuleExtractPrefix("npm install")).toBeNull();
  });

  test("returns null for empty string", () => {
    expect(permissionRuleExtractPrefix("")).toBeNull();
  });

  test("returns null for wildcard without colon", () => {
    expect(permissionRuleExtractPrefix("npm *")).toBeNull();
  });
});

// ─── hasWildcards ───────────────────────────────────────────────────────

describe("hasWildcards", () => {
  test("returns true for unescaped wildcard", () => {
    expect(hasWildcards("git *")).toBe(true);
  });

  test("returns false for legacy :* syntax", () => {
    expect(hasWildcards("npm:*")).toBe(false);
  });

  test("returns false for escaped wildcard", () => {
    expect(hasWildcards("git \\*")).toBe(false);
  });

  test("returns true for * with even backslashes", () => {
    expect(hasWildcards("git \\\\*")).toBe(true);
  });

  test("returns false for no wildcards", () => {
    expect(hasWildcards("npm install")).toBe(false);
  });

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

// ─── matchWildcardPattern ───────────────────────────────────────────────

describe("matchWildcardPattern", () => {
  test("matches simple wildcard", () => {
    expect(matchWildcardPattern("git *", "git add")).toBe(true);
  });

  test("matches bare command when pattern ends with space-wildcard", () => {
    expect(matchWildcardPattern("git *", "git")).toBe(true);
  });

  test("rejects non-matching command", () => {
    expect(matchWildcardPattern("git *", "npm install")).toBe(false);
  });

  test("matches middle wildcard", () => {
    expect(matchWildcardPattern("git * --verbose", "git add --verbose")).toBe(true);
  });

  test("handles escaped asterisk as literal", () => {
    expect(matchWildcardPattern("echo \\*", "echo *")).toBe(true);
    expect(matchWildcardPattern("echo \\*", "echo hello")).toBe(false);
  });

  test("case-insensitive matching", () => {
    expect(matchWildcardPattern("Git *", "git add", true)).toBe(true);
  });

  test("exact match without wildcards", () => {
    expect(matchWildcardPattern("npm install", "npm install")).toBe(true);
    expect(matchWildcardPattern("npm install", "npm update")).toBe(false);
  });

  test("handles regex special characters in pattern", () => {
    expect(matchWildcardPattern("echo (hello)", "echo (hello)")).toBe(true);
  });
});

// ─── parsePermissionRule ────────────────────────────────────────────────

describe("parsePermissionRule", () => {
  test("parses exact command", () => {
    const result = parsePermissionRule("npm install");
    expect(result).toEqual({ type: "exact", command: "npm install" });
  });

  test("parses legacy prefix syntax", () => {
    const result = parsePermissionRule("npm:*");
    expect(result).toEqual({ type: "prefix", prefix: "npm" });
  });

  test("parses wildcard pattern", () => {
    const result = parsePermissionRule("git *");
    expect(result).toEqual({ type: "wildcard", pattern: "git *" });
  });

  test("escaped wildcard is treated as exact", () => {
    const result = parsePermissionRule("echo \\*");
    expect(result.type).toBe("exact");
  });
});

// ─── suggestionForExactCommand ──────────────────────────────────────────

describe("suggestionForExactCommand", () => {
  test("creates addRules suggestion", () => {
    const result = suggestionForExactCommand("Bash", "npm install");
    expect(result).toHaveLength(1);
    expect(result[0]!.type).toBe("addRules");
    expect((result[0] as any).rules[0]!.toolName).toBe("Bash");
    expect((result[0] as any).rules[0]!.ruleContent).toBe("npm install");
    expect((result[0] as any).behavior).toBe("allow");
  });
});

// ─── suggestionForPrefix ────────────────────────────────────────────────

describe("suggestionForPrefix", () => {
  test("creates prefix suggestion with :*", () => {
    const result = suggestionForPrefix("Bash", "npm");
    expect((result[0] as any).rules[0]!.ruleContent).toBe("npm:*");
  });
});