import { pool } from '../../config/db.js';

const LIST_SELECT = `
  SELECT a.id, a.project_id, a.code, a.name, a.description, a.responsible_user_id, u.name AS responsible_name,
         a.priority_id, pr.name AS priority_name, pr.color AS priority_color,
         a.status_id, st.name AS status_name, st.color AS status_color, st.is_closed AS status_is_closed,
         a.start_date, a.due_date, a.actual_end_date, a.progress_pct, a.is_milestone,
         a.estimated_hours, a.created_by, a.created_at, a.updated_at
  FROM activities a
  JOIN priorities pr ON pr.id = a.priority_id
  JOIN activity_statuses st ON st.id = a.status_id
  LEFT JOIN users u ON u.id = a.responsible_user_id
`;

export async function findByProject(projectId) {
  const [rows] = await pool.query(`${LIST_SELECT} WHERE a.project_id = ? ORDER BY a.start_date, a.id`, [projectId]);
  return rows;
}

export async function findById(id) {
  const [rows] = await pool.query(`${LIST_SELECT} WHERE a.id = ?`, [id]);
  return rows[0] || null;
}

export async function create(projectId, data) {
  const [result] = await pool.query(
    `INSERT INTO activities
      (project_id, code, name, description, responsible_user_id, priority_id, status_id,
       start_date, due_date, is_milestone, estimated_hours, created_by)
     VALUES (?, 'PENDING', ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
    [
      projectId, data.name, data.description || null, data.responsibleUserId || null,
      data.priorityId, data.statusId, data.startDate || null, data.dueDate || null,
      data.isMilestone ? 1 : 0, data.estimatedHours || null, data.createdBy,
    ]
  );
  const id = result.insertId;
  const code = `ACT-${String(id).padStart(4, '0')}`;
  await pool.query('UPDATE activities SET code = ? WHERE id = ?', [code, id]);
  return findById(id);
}

export async function update(id, data) {
  await pool.query(
    `UPDATE activities SET
       name = ?, description = ?, responsible_user_id = ?, priority_id = ?, status_id = ?,
       start_date = ?, due_date = ?, actual_end_date = ?, is_milestone = ?, estimated_hours = ?
     WHERE id = ?`,
    [
      data.name, data.description || null, data.responsibleUserId || null, data.priorityId, data.statusId,
      data.startDate || null, data.dueDate || null, data.actualEndDate || null,
      data.isMilestone ? 1 : 0, data.estimatedHours || null, id,
    ]
  );
  return findById(id);
}

export async function updateProgress(id, progressPct) {
  await pool.query('UPDATE activities SET progress_pct = ? WHERE id = ?', [progressPct, id]);
}

// Arrastra activity_dependencies (ambos lados) y tasks por ON DELETE CASCADE.
export async function remove(id) {
  await pool.query('DELETE FROM activities WHERE id = ?', [id]);
}

export async function countTasks(id) {
  const [rows] = await pool.query('SELECT COUNT(*) AS c FROM tasks WHERE activity_id = ?', [id]);
  return rows[0].c;
}

export async function listDependencies(id) {
  const [rows] = await pool.query(
    `SELECT d.depends_on_activity_id AS id, a.code, a.name, a.status_id, st.is_closed AS status_is_closed
     FROM activity_dependencies d
     JOIN activities a ON a.id = d.depends_on_activity_id
     JOIN activity_statuses st ON st.id = a.status_id
     WHERE d.activity_id = ?`,
    [id]
  );
  return rows;
}

export async function addDependency(activityId, dependsOnActivityId) {
  await pool.query(
    'INSERT IGNORE INTO activity_dependencies (activity_id, depends_on_activity_id) VALUES (?, ?)',
    [activityId, dependsOnActivityId]
  );
  return listDependencies(activityId);
}

export async function removeDependency(activityId, dependsOnActivityId) {
  await pool.query('DELETE FROM activity_dependencies WHERE activity_id = ? AND depends_on_activity_id = ?', [
    activityId, dependsOnActivityId,
  ]);
  return listDependencies(activityId);
}

export async function findDueOrOverdue(userId, { onlyMine = false } = {}) {
  const clauses = ["st.is_closed = 0", "a.due_date IS NOT NULL"];
  const params = [];
  if (onlyMine) { clauses.push('a.responsible_user_id = ?'); params.push(userId); }
  const [rows] = await pool.query(
    `${LIST_SELECT} WHERE ${clauses.join(' AND ')} ORDER BY a.due_date`,
    params
  );
  return rows;
}