import * as colors from 'jsr:@std/fmt@^1.0.4/colors';
import * as log from 'jsr:@std/log';
import { getEveFilePath } from './files.ts';
export * as log from 'jsr:@std/log';

export async function setupLogger() {
  const formatLevel = (level: number): string => {
    return (
      {
        10: colors.gray('[DEBUG]'),
        20: colors.green('[INFO] '),
        30: colors.yellow('[WARN] '),
        40: colors.red('[ERROR]'),
        50: colors.bgRed('[FATAL]'),
      }[level] || `[LVL${level}]`
    );
  };

  const levelName = (level: number): string => {
    return (
      {
        10: 'DEBUG',
        20: 'INFO',
        30: 'WARN',
        40: 'ERROR',
        50: 'FATAL',
      }[level] || `LVL${level}`
    );
  };

  const formatArg = (arg: unknown): string => {
    if (typeof arg === 'object') return JSON.stringify(arg);
    return String(arg);
  };

  await log.setup({
    handlers: {
      console: new log.ConsoleHandler('DEBUG', {
        useColors: true,
        formatter: (record) => {
          const timestamp = new Date().toISOString();
          let msg = `${colors.dim(`[${timestamp}]`)} ${formatLevel(record.level)} ${record.msg}`;

          if (record.args.length > 0) {
            const args = record.args
              .map((arg, i) => `${colors.dim(`arg${i}:`)} ${formatArg(arg)}`)
              .join(' ');
            msg += ` ${colors.dim('|')} ${args}`;
          }

          return msg;
        },
      }),
      file: new log.FileHandler('DEBUG', {
        filename:
          Deno.env.get('LOG_FILE') || (await getEveFilePath('eve-logs.jsonl')),
        formatter: (record) => {
          const timestamp = new Date().toISOString();
          return JSON.stringify({
            timestamp,
            level: levelName(record.level),
            msg: record.msg,
            args: record.args,
          });
        },
      }),
    },
    loggers: {
      default: {
        level: 'DEBUG',
        handlers: ['console', 'file'],
      },
    },
  });
}