const fs = require("fs");

async function createPlugin(ctx) {
  return {
    async execute(action) {
      if (action === "runCheck") {
        return runCheck(ctx);
      }
      throw new Error(`Unknown action: ${action}`);
    },
    async getStatus() {
      return readStatus(ctx);
    },
    async health() {
      return { ok: true };
    }
  };
}

async function runCheck(ctx) {
  const command = String(ctx.getSetting("checkCommand", ctx.env.VSWR_CHECK_CMD || "")).trim();
  if (!command) {
    return {
      ok: true,
      skipped: true,
      message: "VSWR_CHECK_CMD nicht gesetzt"
    };
  }
  const simulate = typeof ctx.simulateHardware === "boolean"
    ? ctx.simulateHardware
    : (process.platform !== "linux" && String(ctx.env.ALLOW_NON_LINUX_CMDS || "false") !== "true");
  if (simulate) {
    return {
      ok: true,
      skipped: true,
      message: `VSWR Check simuliert (${ctx.execMode || "dev"})`,
      status: readStatus(ctx)
    };
  }
  const result = await ctx.commandRunner(command, {
    timeoutMs: Number(ctx.getSetting("timeoutMs", ctx.env.VSWR_CHECK_TIMEOUT_MS || 240000))
  });
  if (!result.ok) {
    throw new Error(result.stderr || result.error || "VSWR check failed");
  }
  return {
    ok: true,
    message: "VSWR check abgeschlossen",
    status: readStatus(ctx)
  };
}

function readStatus(ctx) {
  const metadataPath = String(ctx.getSetting("metadataPath", ctx.env.VSWR_METADATA_PATH || "")).trim();
  if (!metadataPath || !fs.existsSync(metadataPath)) {
    return {
      status: "UNKNOWN",
      path: metadataPath || null
    };
  }
  const raw = fs.readFileSync(metadataPath, "utf8").trim();
  return {
    status: raw || "UNKNOWN",
    path: metadataPath
  };
}

module.exports = {
  createPlugin
};