package postgres

import (
	"database/sql"
	"log"

	"github.com/dustinpianalto/quartermaster"
)

type groupService struct {
	db *sql.DB
}

func (s groupService) Group(id int, user *quartermaster.User) (*quartermaster.Group, error) {
	var g quartermaster.Group
	queryString := "SELECT id, name, description FROM groups WHERE id = $1 AND owner_id = $2"
	row := s.db.QueryRow(queryString, id, user.ID)
	err := row.Scan(&g.ID, &g.Name, &g.Description)
	if err != nil {
		return nil, err
	}
	return &g, nil
}

func (s groupService) AddGroup(g *quartermaster.Group, user *quartermaster.User) (*quartermaster.Group, error) {
	queryString := "INSERT INTO groups (name, description, owner_id) VALUES ($1, $2, $3) RETURNING id"
	err := s.db.QueryRow(queryString, g.Name, g.Description, user.ID).Scan(&g.ID)
	return g, err
}

func (s groupService) UpdateGroup(g *quartermaster.Group, user *quartermaster.User) error {
	queryString := "UPDATE groups SET name = $2, description = $3 WHERE id = $1 AND owner_id = $4"
	_, err := s.db.Exec(queryString, g.ID, g.Name, g.Description, user.ID)
	return err
}

func (s groupService) DeleteGroup(g *quartermaster.Group, user *quartermaster.User) error {
	queryString := "DELETE FROM groups WHERE id = $1 AND owner_id = $2"
	_, err := s.db.Exec(queryString, g.ID, user.ID)
	return err
}

func (s groupService) GetItems(g *quartermaster.Group, user *quartermaster.User) ([]*quartermaster.Item, error) {
	var items []*quartermaster.Item
	queryString := "SELECT item_id FROM x_items_groups WHERE group_id = $1"
	rows, err := s.db.Query(queryString, g.ID)
	if err != nil {
		return nil, err
	}
	for rows.Next() {
		var id int
		err = rows.Scan(&id)
		if err != nil {
			log.Println(err)
			continue
		}
		item, err := ItemService.Item(id, user)
		if err != nil {
			log.Println(err)
			continue
		}
		items = append(items, item)
	}
	return items, nil
}

func (s groupService) GetGroups(user *quartermaster.User) ([]*quartermaster.Group, error) {
	var groups []*quartermaster.Group
	queryString := "SELECT id FROM groups WHERE owner_id = $1"
	rows, err := s.db.Query(queryString, user.ID)
	if err != nil {
		return nil, err
	}
	for rows.Next() {
		var g *quartermaster.Group
		err := rows.Scan(&g.ID)
		if err != nil {
			log.Println(err)
			continue
		}
		g, err = s.Group(g.ID, user)
		if err != nil {
			log.Println(err)
			continue
		}
		groups = append(groups, g)
	}
	return groups, nil
}