package main

import (
	"database/sql"
	"fmt"
	"log"

	_ "github.com/lib/pq"
)

// setup the Database
func setupDatabase() *sql.DB {
	connStr := "user=postgres dbname=postgres sslmode=disable"
	db, err := sql.Open("postgres", connStr)
	if err != nil {
		log.Fatal(err)
	}

	return db
}

// getNames gets the name of all the challenges
func dbGetName(db *sql.DB) string {

	// get the current name of the challenges
	query := fmt.Sprintf("SELECT name FROM challenges WHERE points=200")
	var names string
	err := db.QueryRow(query).Scan(&names)
	if err != nil {
		log.Fatalf("[ E ] :", err)
	}

	return names
}

// getAllChallenges gets all the challenges from the server
func dbGetAllChallenges() []Challenge {

	// build the query
	query := fmt.Sprintf("SELECT * FROM challenges")

	// Execute the query
	rows, err := db.Query(query)
	defer rows.Close()
	if err != nil {
		log.Printf("[ E ] getAllChallenges query: %v\n\t\t\t query: %s\n", err, query)
		return []Challenge{}
	}

	var challenges []Challenge

	// iterate over the returned rows
	for rows.Next() {

		var uuid, name, description, flag, container, category string
		var points int
		var static bool

		scanErr := rows.Scan(&uuid, &name, &description, &flag, &container, &category, &points, &static)
		if scanErr != nil {
			log.Printf("[ E ] scan error: %v", scanErr)
			return []Challenge{}
		}

		newChallenge := Challenge{
			UUID:        uuid,
			Name:        name,
			Description: description,
			Flag:        flag,
			Container:   container,
			Category:    category,
			Points:      points,
			Static:      static,
		}

		challenges = append(challenges, newChallenge)
	}

	return challenges
}

// dbNewChallenge inserts the given challenge into the database
func dbNewChallenge(challenge Challenge) (string, error) {

	// build the query to be executed
	query := fmt.Sprintf("INSERT INTO challenges(name, description, flag, container, category, points, static) VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING uuid")

	// execute the query with the challenge values given
	var uuid string
	err := db.QueryRow(query, challenge.Name, challenge.Description, challenge.Flag, challenge.Container, challenge.Category, challenge.Points, challenge.Static).Scan(&uuid)

	// handle errors
	if err != nil {
		return "", err
	}
	return uuid, nil
}

// editChallengeUUID edited the challenge with the given uuid using the values in the updatedChallenge
func dbEditChallengeUUID(uuid string, updatedChallenge Challenge) error {
	query := fmt.Sprintf("UPDATE challenges SET name = '%s', description = '%s', flag = '%s', container = '%s', category = '%s', points = %d, static = %t WHERE uuid::text = '%s'", updatedChallenge.Name, updatedChallenge.Description, updatedChallenge.Flag, updatedChallenge.Container, updatedChallenge.Category, updatedChallenge.Points, updatedChallenge.Static, updatedChallenge.UUID)

	_, _ = db.Exec(query)

	return nil
}

// dbGetChallengeByUUID returns the challenge with the given UUID from the database
func dbGetChallengeByUUID(uuid string) (Challenge, error) {
	// build the query to be executed
	query := fmt.Sprintf("SELECT uuid, name, description, flag, container, category, points, static FROM challenges WHERE uuid::text= '%s'", uuid)

	challenge := Challenge{}

	// execute the query storing the values in the challenge struct defined above
	err := db.QueryRow(query).Scan(&challenge.UUID, &challenge.Name, &challenge.Description, &challenge.Flag, &challenge.Container, &challenge.Category, &challenge.Points, &challenge.Static)

	if err != nil {
		return Challenge{}, err
	}
	return challenge, nil
}