export class ProjectLimitsPolicy {
  constructor() {
    this.softFileLimit = 1000;
    this.hardFileLimit = 10000;
    this.softSizeLimitBytes = 1 * 1024 * 1024;
    this.hardSizeLimitBytes = 10 * 1024 * 1024;
    this.ignoredDirectoryNames = new Set(["app-data", "build", "grafana", "__pycache__"]);
  }

  summarizeFileList(fileList) {
    let totalFiles = 0;
    let totalBytes = 0;

    for (const file of fileList) {
      const relPath = (file.webkitRelativePath || file.name || "").replaceAll("\\", "/");
      if (this.#isIgnoredPath(relPath)) continue;
      totalFiles += 1;
      totalBytes += Number(file.size || 0);
    }

    return { totalFiles, totalBytes };
  }

  evaluate(stats) {
    const softWarnings = [];
    const hardErrors = [];

    if (stats.totalFiles > this.hardFileLimit) {
      hardErrors.push(`Количество файлов ${stats.totalFiles} превышает лимит ${this.hardFileLimit}.`);
    } else if (stats.totalFiles > this.softFileLimit) {
      softWarnings.push(`Количество файлов ${stats.totalFiles} больше ${this.softFileLimit}.`);
    }

    if (stats.totalBytes > this.hardSizeLimitBytes) {
      hardErrors.push(
        `Размер данных ${this.#formatBytes(stats.totalBytes)} превышает лимит ${this.#formatBytes(this.hardSizeLimitBytes)}.`
      );
    } else if (stats.totalBytes > this.softSizeLimitBytes) {
      softWarnings.push(
        `Размер данных ${this.#formatBytes(stats.totalBytes)} больше ${this.#formatBytes(this.softSizeLimitBytes)}.`
      );
    }

    return { softWarnings, hardErrors };
  }

  #isIgnoredPath(path) {
    const parts = String(path || "")
      .split("/")
      .filter(Boolean);
    return parts.some((segment) => segment.startsWith(".") || this.ignoredDirectoryNames.has(segment));
  }

  #formatBytes(bytes) {
    if (bytes < 1024) return `${bytes} B`;
    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
    return `${(bytes / (1024 * 1024)).toFixed(2)} MB`;
  }
}