import path from "path";
import chalk from "chalk";
import boxen from "boxen";
import Table from "cli-table3";

import { log, readJSON, writeJSON, truncate, isSilentMode } from "../utils.js";
import { displayBanner } from "../ui.js";
import generateTaskFiles from "./generate-task-files.js";

/**
 * Clear subtasks from specified tasks
 * @param {string} tasksPath - Path to the tasks.json file
 * @param {string} taskIds - Task IDs to clear subtasks from
 */
function clearSubtasks(tasksPath, taskIds) {
  log("info", `Reading tasks from ${tasksPath}...`);
  const data = readJSON(tasksPath);
  if (!data || !data.tasks) {
    log("error", "No valid tasks found.");
    process.exit(1);
  }

  if (!isSilentMode()) {
    console.log(
      boxen(chalk.white.bold("Clearing Subtasks"), {
        padding: 1,
        borderColor: "blue",
        borderStyle: "round",
        margin: { top: 1, bottom: 1 },
      })
    );
  }

  // Handle multiple task IDs (comma-separated)
  const taskIdArray = taskIds.split(",").map((id) => id.trim());
  let clearedCount = 0;

  // Create a summary table for the cleared subtasks
  const summaryTable = new Table({
    head: [
      chalk.cyan.bold("Task ID"),
      chalk.cyan.bold("Task Title"),
      chalk.cyan.bold("Subtasks Cleared"),
    ],
    colWidths: [10, 50, 20],
    style: { head: [], border: [] },
  });

  taskIdArray.forEach((taskId) => {
    const id = parseInt(taskId, 10);
    if (isNaN(id)) {
      log("error", `Invalid task ID: ${taskId}`);
      return;
    }

    const task = data.tasks.find((t) => t.id === id);
    if (!task) {
      log("error", `Task ${id} not found`);
      return;
    }

    if (!task.subtasks || task.subtasks.length === 0) {
      log("info", `Task ${id} has no subtasks to clear`);
      summaryTable.push([
        id.toString(),
        truncate(task.title, 47),
        chalk.yellow("No subtasks"),
      ]);
      return;
    }

    const subtaskCount = task.subtasks.length;
    task.subtasks = [];
    clearedCount++;
    log("info", `Cleared ${subtaskCount} subtasks from task ${id}`);

    summaryTable.push([
      id.toString(),
      truncate(task.title, 47),
      chalk.green(`${subtaskCount} subtasks cleared`),
    ]);
  });

  if (clearedCount > 0) {
    writeJSON(tasksPath, data);

    // Show summary table
    if (!isSilentMode()) {
      console.log(
        boxen(chalk.white.bold("Subtask Clearing Summary:"), {
          padding: { left: 2, right: 2, top: 0, bottom: 0 },
          margin: { top: 1, bottom: 0 },
          borderColor: "blue",
          borderStyle: "round",
        })
      );
      console.log(summaryTable.toString());
    }

    // Regenerate task files to reflect changes
    log("info", "Regenerating task files...");
    generateTaskFiles(tasksPath, path.dirname(tasksPath));

    // Success message
    if (!isSilentMode()) {
      console.log(
        boxen(
          chalk.green(
            `Successfully cleared subtasks from ${chalk.bold(clearedCount)} task(s)`
          ),
          {
            padding: 1,
            borderColor: "green",
            borderStyle: "round",
            margin: { top: 1 },
          }
        )
      );

      // Next steps suggestion
      console.log(
        boxen(
          chalk.white.bold("Next Steps:") +
            "\n\n" +
            `${chalk.cyan("1.")} Run ${chalk.yellow("task-master expand --id=<id>")} to generate new subtasks\n` +
            `${chalk.cyan("2.")} Run ${chalk.yellow("task-master list --with-subtasks")} to verify changes`,
          {
            padding: 1,
            borderColor: "cyan",
            borderStyle: "round",
            margin: { top: 1 },
          }
        )
      );
    }
  } else {
    if (!isSilentMode()) {
      console.log(
        boxen(chalk.yellow("No subtasks were cleared"), {
          padding: 1,
          borderColor: "yellow",
          borderStyle: "round",
          margin: { top: 1 },
        })
      );
    }
  }
}

export default clearSubtasks;