import {
  addLineToFile,
  doesExecutableExistOnSystem,
  removeLinesMatchingPattern,
} from "../helpers.js";
import { execSync } from "child_process";

const shellName = "Fish";
const executableName = "fish";
const startupFileCommand = "echo ~/.config/fish/config.fish";
const eol = "\n"; // When fish runs on Windows (e.g., Git Bash or WSL), it expects LF line endings.

function isInstalled() {
  return doesExecutableExistOnSystem(executableName);
}

function teardown(tools) {
  const startupFile = getStartupFile();

  for (const { tool } of tools) {
    // Remove any existing alias for the tool
    removeLinesMatchingPattern(
      startupFile,
      new RegExp(`^alias\\s+${tool}\\s+`),
      eol
    );
  }

  // Removes the line that sources the safe-chain fish initialization script (~/.safe-chain/scripts/init-fish.fish)
  removeLinesMatchingPattern(
    startupFile,
    /^source\s+~\/\.safe-chain\/scripts\/init-fish\.fish/,
    eol
  );

  return true;
}

function setup() {
  const startupFile = getStartupFile();

  addLineToFile(
    startupFile,
    `source ~/.safe-chain/scripts/init-fish.fish # Safe-chain Fish initialization script`,
    eol
  );

  return true;
}

function getStartupFile() {
  try {
    return execSync(startupFileCommand, {
      encoding: "utf8",
      shell: executableName,
    }).trim();
  } catch (error) {
    throw new Error(
      `Command failed: ${startupFileCommand}. Error: ${error.message}`
    );
  }
}

export default {
  name: shellName,
  isInstalled,
  setup,
  teardown,
};