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

const LIST_SELECT = `
  SELECT p.id, p.code, p.name, p.description, p.objective, p.project_type_id, pt.name AS project_type_name,
         p.priority_id, pr.name AS priority_name, pr.color AS priority_color, pr.level AS priority_level,
         p.status_id, ps.name AS status_name, ps.color AS status_color, ps.is_closed AS status_is_closed,
         p.owner_user_id, u.name AS owner_name,
         p.requesting_department_id, rd.name AS requesting_department_name,
         p.responsible_department_id, sd.name AS responsible_department_name,
         p.start_date, p.estimated_end_date, p.actual_end_date, p.progress_pct,
         p.risk_level, p.notes, p.created_by, p.created_at, p.updated_at, p.deleted_at, p.deleted_by
  FROM projects p
  JOIN priorities pr ON pr.id = p.priority_id
  JOIN project_statuses ps ON ps.id = p.status_id
  JOIN users u ON u.id = p.owner_user_id
  LEFT JOIN project_types pt ON pt.id = p.project_type_id
  LEFT JOIN departments rd ON rd.id = p.requesting_department_id
  LEFT JOIN departments sd ON sd.id = p.responsible_department_id
`;

export async function findAll({ statusId, priorityId, ownerUserId, memberUserId, trash } = {}) {
  const clauses = [trash ? 'p.deleted_at IS NOT NULL' : 'p.deleted_at IS NULL'];
  const params = [];
  if (statusId) { clauses.push('p.status_id = ?'); params.push(statusId); }
  if (priorityId) { clauses.push('p.priority_id = ?'); params.push(priorityId); }
  if (ownerUserId) { clauses.push('p.owner_user_id = ?'); params.push(ownerUserId); }
  // Restringe a proyectos donde el usuario es miembro (compartidos con el, o el propio dueño ya
  // que quien crea un proyecto queda como miembro 'owner' automaticamente -- ver create()).
  if (memberUserId) {
    clauses.push('EXISTS (SELECT 1 FROM project_members pm WHERE pm.project_id = p.id AND pm.user_id = ?)');
    params.push(memberUserId);
  }
  const where = `WHERE ${clauses.join(' AND ')}`;
  const [rows] = await pool.query(`${LIST_SELECT} ${where} ORDER BY p.created_at DESC`, params);
  return rows;
}

export async function findById(id, { includeDeleted = false } = {}) {
  const where = includeDeleted ? 'p.id = ?' : 'p.id = ? AND p.deleted_at IS NULL';
  const [rows] = await pool.query(`${LIST_SELECT} WHERE ${where}`, [id]);
  return rows[0] || null;
}

export async function softDelete(id, userId) {
  await pool.query('UPDATE projects SET deleted_at = NOW(), deleted_by = ? WHERE id = ? AND deleted_at IS NULL', [userId, id]);
}

export async function restore(id) {
  await pool.query('UPDATE projects SET deleted_at = NULL, deleted_by = NULL WHERE id = ?', [id]);
}

export async function hardDelete(id) {
  await pool.query('DELETE FROM projects WHERE id = ?', [id]);
}

export async function create(data) {
  const [result] = await pool.query(
    `INSERT INTO projects
      (code, name, description, objective, project_type_id, priority_id, status_id, owner_user_id,
       requesting_department_id, responsible_department_id, start_date, estimated_end_date,
       risk_level, notes, created_by)
     VALUES ('PENDING', ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
    [
      data.name, data.description || null, data.objective || null, data.projectTypeId || null,
      data.priorityId, data.statusId, data.ownerUserId,
      data.requestingDepartmentId || null, data.responsibleDepartmentId || null,
      data.startDate || null, data.estimatedEndDate || null,
      data.riskLevel || 'low', data.notes || null, data.createdBy,
    ]
  );
  const id = result.insertId;
  const code = `PRY-${String(id).padStart(4, '0')}`;
  await pool.query('UPDATE projects SET code = ? WHERE id = ?', [code, id]);
  // El creador queda como miembro por defecto.
  await pool.query('INSERT IGNORE INTO project_members (project_id, user_id, role_in_project) VALUES (?, ?, ?)', [
    id, data.ownerUserId, 'owner',
  ]);
  return findById(id);
}

// Usado al crear un proyecto sin elegir estado explicito (ej. al convertir una actividad en
// proyecto): el primer estado no-cerrado por orden manual, tipicamente "Planificado".
export async function getDefaultStatusId() {
  const [rows] = await pool.query('SELECT id FROM project_statuses WHERE is_closed = 0 ORDER BY sort_order LIMIT 1');
  return rows[0]?.id || null;
}

export async function update(id, data) {
  await pool.query(
    `UPDATE projects SET
       name = ?, description = ?, objective = ?, project_type_id = ?, priority_id = ?, status_id = ?,
       owner_user_id = ?, requesting_department_id = ?, responsible_department_id = ?,
       start_date = ?, estimated_end_date = ?, actual_end_date = ?, risk_level = ?, notes = ?
     WHERE id = ?`,
    [
      data.name, data.description || null, data.objective || null, data.projectTypeId || null,
      data.priorityId, data.statusId, data.ownerUserId,
      data.requestingDepartmentId || null, data.responsibleDepartmentId || null,
      data.startDate || null, data.estimatedEndDate || null, data.actualEndDate || null,
      data.riskLevel || 'low', data.notes || null, id,
    ]
  );
  return findById(id);
}

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

export async function listMembers(projectId) {
  const [rows] = await pool.query(
    `SELECT pm.user_id, u.name, u.email, pm.role_in_project, pm.added_at
     FROM project_members pm JOIN users u ON u.id = pm.user_id
     WHERE pm.project_id = ? ORDER BY u.name`,
    [projectId]
  );
  return rows;
}

export async function isMember(projectId, userId) {
  const [rows] = await pool.query('SELECT 1 FROM project_members WHERE project_id = ? AND user_id = ?', [
    projectId, userId,
  ]);
  return rows.length > 0;
}

// null = no es miembro; 'member' = miembro sin rol especifico; 'admin'/'owner' = con ese rol.
export async function getMembership(projectId, userId) {
  const [rows] = await pool.query('SELECT role_in_project FROM project_members WHERE project_id = ? AND user_id = ?', [
    projectId, userId,
  ]);
  if (!rows.length) return null;
  return rows[0].role_in_project || 'member';
}

export async function addMember(projectId, userId, roleInProject) {
  await pool.query(
    'INSERT IGNORE INTO project_members (project_id, user_id, role_in_project) VALUES (?, ?, ?)',
    [projectId, userId, roleInProject || null]
  );
  return listMembers(projectId);
}

// Nunca toca una fila con role_in_project = 'owner' (protege al dueño de perder ese rol por aqui).
export async function updateMemberRole(projectId, userId, roleInProject) {
  await pool.query(
    `UPDATE project_members SET role_in_project = ?
     WHERE project_id = ? AND user_id = ? AND (role_in_project IS NULL OR role_in_project <> 'owner')`,
    [roleInProject, projectId, userId]
  );
  return listMembers(projectId);
}

export async function removeMember(projectId, userId) {
  await pool.query('DELETE FROM project_members WHERE project_id = ? AND user_id = ?', [projectId, userId]);
  return listMembers(projectId);
}

export async function averageActivityProgress(projectId) {
  const [rows] = await pool.query('SELECT AVG(progress_pct) AS avg_pct FROM activities WHERE project_id = ?', [
    projectId,
  ]);
  return rows[0].avg_pct === null ? 0 : Number(rows[0].avg_pct);
}