import { assertEquals, assertThrows } from "@std/assert";
import Logger from '../lib/logger.ts';

Deno.test("Logger Constructor - should throw error for invalid log level", () => {
  assertThrows(() => {
    new Logger({ level: 'invalid' });
  }, Error, "Invalid log level: invalid. Valid levels are: silent, error, warn, info, debug");
});

Deno.test("Logger Constructor - should throw error for invalid format", () => {
  assertThrows(() => {
    new Logger({ format: 'invalid' });
  }, Error, "Invalid format: invalid. Valid formats are: json, simple");
});

Deno.test("Logger Constructor - should throw error for invalid time option", () => {
  assertThrows(() => {
    new Logger({ time: 'invalid' });
  }, Error, "Invalid time: invalid. Valid times are: long, short");
});

Deno.test("Logger Constructor - should throw error for invalid callerLevel", () => {
  assertThrows(() => {
    new Logger({ callerLevel: 'invalid' });
  }, Error, "Invalid callerLevel: invalid. Valid levels are: silent, error, warn, info, debug");
});

Deno.test("Logger Constructor - should throw error for non-object colours", () => {
  assertThrows(() => {
    new Logger({ colours: 'not an object' });
  }, Error, "colours option must be an object");
});

Deno.test("Logger Constructor - should throw error for non-object levels", () => {
  assertThrows(() => {
    new Logger({ levels: 'not an object' });
  }, Error, "levels option must be an object");
});

Deno.test("Logger Constructor - should throw error for invalid level values", () => {
  assertThrows(() => {
    new Logger({ levels: { error: -1 } });
  }, Error, "Level value for 'error' must be a non-negative integer");

  assertThrows(() => {
    new Logger({ levels: { error: 'not a number' } });
  }, Error, "Level value for 'error' must be a non-negative integer");

  assertThrows(() => {
    new Logger({ levels: { error: 1.5 } });
  }, Error, "Level value for 'error' must be a non-negative integer");
});

Deno.test("Logger Constructor - should accept valid options without throwing", () => {
  // This should not throw
  new Logger({
    level: 'debug',
    format: 'simple',
    time: 'long',
    callerLevel: 'error',
    colours: { error: '\x1b[31m' },
    levels: { custom: 4 },
  });
});

Deno.test("Logger Constructor - should instantiate with default options", () => {
  const logger = new Logger();
  assertEquals(logger.options.level, 'info');
  assertEquals(logger.options.format, 'json');
  assertEquals(logger.options.time, 'short');
  assertEquals(logger.options.callerLevel, 'warn');
  assertEquals(logger.options.levels, {
    silent: -1,
    error: 0,
    warn: 1,
    info: 2,
    debug: 3,
  });
});

Deno.test("Logger Constructor - should instantiate with custom options", () => {
  const logger = new Logger({
    level: 'debug',
    format: 'simple',
    time: 'long',
    callerLevel: 'error',
  });
  assertEquals(logger.options.level, 'debug');
  assertEquals(logger.options.format, 'simple');
  assertEquals(logger.options.time, 'long');
  assertEquals(logger.options.callerLevel, 'error');
});

Deno.test("Logger Constructor - should merge options correctly", () => {
  const customOptions = {
    level: 'debug',
    format: 'simple',
    time: 'long',
    colours: {
      error: '\x1b[31m', // different red
    },
  };

  const logger = new Logger(customOptions);

  assertEquals(logger.options.level, 'debug');
  assertEquals(logger.options.format, 'simple');
  assertEquals(logger.options.time, 'long');
  assertEquals(logger.options.colours.error, '\x1b[31m');
  // Should still have other default colors
  assertEquals(logger.options.colours.warn, '\x1b[33m');
});

Deno.test("Logger Constructor - should have all log level methods", () => {
  const logger = new Logger();
  assertEquals(typeof logger.error, 'function');
  assertEquals(typeof logger.warn, 'function');
  assertEquals(typeof logger.info, 'function');
  assertEquals(typeof logger.debug, 'function');
});

Deno.test("Logger Constructor - should have level management methods", () => {
  const logger = new Logger();
  assertEquals(typeof logger.level, 'function');
  assertEquals(typeof logger.setLevel, 'function');
});

Deno.test("Logger Constructor - should detect TTY correctly", () => {
  const originalIsTTY = Deno.stdout.isTerminal();

  // Mock TTY mode
  Deno.stdout.isTerminal = () => true;
  const logger1 = new Logger();
  assertEquals(logger1.isRedirected, false);

  Deno.stdout.isTerminal = () => false;
  const logger2 = new Logger();
  assertEquals(logger2.isRedirected, true);

  // Restore original
  Deno.stdout.isTerminal = () => originalIsTTY;
});

Deno.test("Logger Constructor - should work with all existing constructor patterns", () => {
  // No options - should not throw
  new Logger();

  // Partial options - should not throw
  new Logger({ level: 'debug' });

  // Full options (without time) - should not throw
  new Logger({
    level: 'warn',
    format: 'simple',
    colours: { error: '\x1b[31m' },
    levels: { custom: 5 },
  });
});