// simpleFiles' own data: granted folders, pending proposals, applied changes, backups, the
// change log and the file name index. All of it lives in one folder outside every project.

import * as crypto from "node:crypto";
import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";

export function dataDir(): string {
  return process.env.SIMPLEFILES_DATA ? path.resolve(process.env.SIMPLEFILES_DATA) : path.join(os.homedir(), ".lmstudio", "simplefiles");
}

export function readJson<T>(file: string, fallback: T): T {
  try {
    return JSON.parse(fs.readFileSync(file, "utf8")) as T;
  } catch {
    return fallback;
  }
}

// Writes through a temporary file in the same folder, so a crash never leaves half a file.
// With a mode, the new file keeps the original's permissions (such as a script's execute bit).
export function writeFileAtomic(file: string, data: string | Buffer, mode?: number): void {
  fs.mkdirSync(path.dirname(file), { recursive: true });
  const tmp = path.join(path.dirname(file), `.${path.basename(file)}.simplefiles-${process.pid}-${Date.now()}.tmp`);
  fs.writeFileSync(tmp, data);
  if (mode !== undefined) {
    try {
      fs.chmodSync(tmp, mode);
    } catch {
      // permissions are kept where the system allows it
    }
  }
  try {
    fs.renameSync(tmp, file);
  } catch (e) {
    try {
      fs.unlinkSync(tmp);
    } catch {
      // nothing to clean up
    }
    throw e;
  }
}

export function writeJson(file: string, value: unknown): void {
  writeFileAtomic(file, JSON.stringify(value, null, 2));
}

export function sha256(data: string | Buffer): string {
  return crypto.createHash("sha256").update(data).digest("hex");
}

export function stamp(d = new Date()): string {
  const p = (n: number) => String(n).padStart(2, "0");
  return `${d.getFullYear()}-${p(d.getMonth() + 1)}-${p(d.getDate())} ${p(d.getHours())}:${p(d.getMinutes())}:${p(d.getSeconds())}`;
}

export function appendLog(line: string): void {
  try {
    fs.mkdirSync(dataDir(), { recursive: true });
    fs.appendFileSync(path.join(dataDir(), "changes.md"), `- ${stamp()}  ${line}\n`, "utf8");
  } catch {
    // the log is a record, not a safeguard; the backups are
  }
}

// simpleFiles' own data: granted folders, pending proposals, applied changes, backups, the
// change log and the file name index. All of it lives in one folder outside every project.

import * as crypto from "node:crypto";
import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";

export function dataDir(): string {
  return process.env.SIMPLEFILES_DATA ? path.resolve(process.env.SIMPLEFILES_DATA) : path.join(os.homedir(), ".lmstudio", "simplefiles");
}

export function readJson<T>(file: string, fallback: T): T {
  try {
    return JSON.parse(fs.readFileSync(file, "utf8")) as T;
  } catch {
    return fallback;
  }
}

// Writes through a temporary file in the same folder, so a crash never leaves half a file.
// With a mode, the new file keeps the original's permissions (such as a script's execute bit).
export function writeFileAtomic(file: string, data: string | Buffer, mode?: number): void {
  fs.mkdirSync(path.dirname(file), { recursive: true });
  const tmp = path.join(path.dirname(file), `.${path.basename(file)}.simplefiles-${process.pid}-${Date.now()}.tmp`);
  fs.writeFileSync(tmp, data);
  if (mode !== undefined) {
    try {
      fs.chmodSync(tmp, mode);
    } catch {
      // permissions are kept where the system allows it
    }
  }
  try {
    fs.renameSync(tmp, file);
  } catch (e) {
    try {
      fs.unlinkSync(tmp);
    } catch {
      // nothing to clean up
    }
    throw e;
  }
}

export function writeJson(file: string, value: unknown): void {
  writeFileAtomic(file, JSON.stringify(value, null, 2));
}

export function sha256(data: string | Buffer): string {
  return crypto.createHash("sha256").update(data).digest("hex");
}

export function stamp(d = new Date()): string {
  const p = (n: number) => String(n).padStart(2, "0");
  return `${d.getFullYear()}-${p(d.getMonth() + 1)}-${p(d.getDate())} ${p(d.getHours())}:${p(d.getMinutes())}:${p(d.getSeconds())}`;
}

export function appendLog(line: string): void {
  try {
    fs.mkdirSync(dataDir(), { recursive: true });
    fs.appendFileSync(path.join(dataDir(), "changes.md"), `- ${stamp()}  ${line}\n`, "utf8");
  } catch {
    // the log is a record, not a safeguard; the backups are
  }
}