package models

import (
	"database/sql"
	"errors"
	"fmt"

	"git.quimbo.fr/odwrtw/canape/backend/sqly"
	"github.com/jmoiron/sqlx"
	"github.com/odwrtw/papi"
)

const (
	addPolochonQuery = `INSERT INTO
		polochons (name, url, token, admin_id)
	VALUES ($1, $2, $3, $4)
	RETURNING id;`
	getPolochonByIDQuery      = `SELECT * FROM polochons WHERE id=$1;`
	getPolochonsByUserIDQuery = `SELECT * FROM polochons WHERE admin_id=$1 ORDER BY created_at DESC;`
	updatePolochonQuery       = `UPDATE polochons SET
		name=:name, url=:url, token=:token, auth_token=:auth_token,
		admin_id=:admin_id
	WHERE id=:id
	RETURNING *;`
	deletePolochonQuery = `DELETE FROM polochons WHERE id=:id;`

	getAllPolochonsQuery = `SELECT * FROM polochons ORDER BY created_at DESC;`
)

// ErrUnknownPolochon returned when a polochon doesn't exist
var ErrUnknownPolochon = fmt.Errorf("polochons: polochon does'nt exist")

// Polochon represents a polochon
type Polochon struct {
	sqly.BaseModel
	Name      string  `db:"name" json:"name"`
	URL       string  `db:"url" json:"url"`
	Token     string  `db:"token" json:"token"`
	AuthToken string  `db:"auth_token" json:"auth_token"`
	AdminID   string  `db:"admin_id" json:"admin_id"`
	Admin     *User   `json:"admin"`
	Users     []*User `json:"users"`
}

// GetPolochonByID returns polochon using its id
func GetPolochonByID(q sqlx.Queryer, id string) (*Polochon, error) {
	p := &Polochon{}
	err := q.QueryRowx(getPolochonByIDQuery, id).StructScan(p)
	if err != nil {
		if err == sql.ErrNoRows {
			return nil, ErrUnknownPolochon
		}
		return nil, err
	}
	return p, nil
}

// GetAllPolochons returns all the polochons
func GetAllPolochons(db *sqlx.DB) ([]*Polochon, error) {
	polochons := []*Polochon{}
	err := db.Select(&polochons, getAllPolochonsQuery)
	if err != nil {
		return nil, err
	}
	return polochons, nil
}

// GetAllPolochonsByUser returns all the polochons owned by the user
func GetAllPolochonsByUser(db *sqlx.DB, id string) ([]*Polochon, error) {
	polochons := []*Polochon{}
	err := db.Select(&polochons, getPolochonsByUserIDQuery, id)
	if err != nil {
		return nil, err
	}
	return polochons, nil
}

// Add polochon to database or raises an error
func (p *Polochon) Add(q sqlx.Queryer) error {
	var id string
	err := q.QueryRowx(addPolochonQuery, p.Name, p.URL, p.Token, p.AdminID).Scan(&id)
	if err != nil {
		return err
	}
	p.ID = id
	return nil
}

// Update polochon on database or raise an error
func (p *Polochon) Update(ex *sqlx.DB) error {
	rows, err := ex.NamedQuery(updatePolochonQuery, p)
	if err != nil {
		return err
	}
	for rows.Next() {
		if err := rows.StructScan(p); err != nil {
			return err
		}
	}
	return nil
}

// Delete polochon from database or raise an error
func (p *Polochon) Delete(ex *sqlx.DB) error {
	_, err := ex.NamedExec(deletePolochonQuery, p)
	if err != nil {
		return err
	}
	return nil
}

// NewPapiClient creates a new papi client for the given polochon
func (p *Polochon) NewPapiClient() (*papi.Client, error) {
	client, err := papi.New(p.URL)
	if err != nil {
		return nil, errors.New("error getting papi client")
	}

	if p.Token != "" {
		client.SetToken(p.Token)
	}
	return client, nil
}