package builtin

import (
	"database/sql"

	"github.com/drone/drone/pkg/types"
)

type Userstore struct {
	*sql.DB
}

func NewUserstore(db *sql.DB) *Userstore {
	return &Userstore{db}
}

// User returns a user by user ID.
func (db *Userstore) User(id int64) (*types.User, error) {
	return getUser(db, rebind(stmtUserSelect), id)
}

// UserLogin returns a user by user login.
func (db *Userstore) UserLogin(login string) (*types.User, error) {
	return getUser(db, rebind(stmtUserSelectUserLogin), login)
}

// UserList returns a list of all registered users.
func (db *Userstore) UserList() ([]*types.User, error) {
	return getUsers(db, rebind(stmtUserSelectList))
}

// UserFeed retrieves a digest of recent builds
// from the datastore accessible to the specified user.
func (db *Userstore) UserFeed(user *types.User, limit, offset int) ([]*types.RepoCommit, error) {
	rows, err := db.Query(rebind(userFeedQuery), user.ID, limit, offset)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	return scanRepoCommits(rows)
}

// UserCount returns a count of all registered users.
func (db *Userstore) UserCount() (int, error) {
	var count int
	err := db.QueryRow(stmtUserSelectCount).Scan(&count)
	return count, err
}

// AddUser inserts a new user into the datastore.
// If the user login already exists an error is returned.
func (db *Userstore) AddUser(user *types.User) error {
	return createUser(db, rebind(stmtUserInsert), user)
}

// SetUser updates an existing user.
func (db *Userstore) SetUser(user *types.User) error {
	return updateUser(db, rebind(stmtUserUpdate), user)
}

// DelUser removes the user from the datastore.
func (db *Userstore) DelUser(user *types.User) error {
	var _, err = db.Exec(rebind(stmtUserDelete), user.ID)
	return err
}

// SQL query to retrieve a build feed for the given
// user account.
const userFeedQuery = `
SELECT
 r.repo_id
,r.repo_owner
,r.repo_name
,r.repo_full_name
,b.build_number
,b.build_status
,b.build_started
,b.build_finished
FROM
 builds b
,repos r
,stars s
WHERE b.build_repo_id = r.repo_id
  AND r.repo_id = s.star_repo_id
  AND s.star_user_id = ?
ORDER BY b.build_number DESC
LIMIT ? OFFSET ?
`

func scanRepoCommits(rows *sql.Rows) ([]*types.RepoCommit, error) {
	var err error
	var vv []*types.RepoCommit
	for rows.Next() {
		v := &types.RepoCommit{}
		err = rows.Scan(
			&v.ID,
			&v.Owner,
			&v.Name,
			&v.FullName,
			&v.Number,
			&v.State,
			&v.Started,
			&v.Finished,
		)
		if err != nil {
			return vv, err
		}
		vv = append(vv, v)
	}
	return vv, rows.Err()
}