import fs from "fs";
import { Task } from "../types/task";
import { Config } from "../types/config";
import dayjs from "dayjs";

export function complete(config: Config, profile: string, task: Task) {
  const profileConfig = config.profiles[profile];

  if (profileConfig === undefined) {
    throw new Error(`Unknown profile ${profile}`);
  }

  if (!profileConfig.completion?.enable) {
    return;
  }

  if (task.recurrenceRule) {
    throw new Error('Recurrence tasks are not supported for now');
  }

  const data = fs.readFileSync(task.sourceFile, 'utf8').split(/\n/);
  const output = [];

  for (const [number0, line] of data.entries()) {
    if (task.sourceLine === number0 + 1) {
      if (task.source !== line) {
        throw new Error(`Cannot complete task, file has been changed since last scan. Rememberred line: ${task.source}, current line: ${line}.`);
      }

      const taskStr = line.replace(/^-(\s+)\[.\]/, `-$1[${profileConfig.completion?.status ?? 'x'}]`);
      output.push(`${taskStr} ✅ ${dayjs().format("YYYY-MM-DD")}`);      
    }

    else {
      output.push(line);    
    }
  }

  fs.writeFileSync(task.sourceFile, output.join("\n"));
}