package models

import (
	"smt/utils/token"
	"errors"
	"log"
	"net/http"

	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/bcrypt"
)

type User struct {
	UserId   int    `db:"UserId"`
	RoleId   int    `db:"RoleId"`
	UserName string `db:"UserName"`
	Password string `db:"Password" json:"-"`
}

type UserRole struct {
	User
	RoleName string `db:"RoleName"`
	ReadOnly bool   `db:"ReadOnly"`
	Admin    bool   `db:"Admin"`
}

func (u *User) SaveUser() (*User, error) {

	var err error

	// Validate username not already in use
	_, err = GetUserByName(u.UserName)
	if err != nil && err.Error() == "user not found" {
		log.Printf("SaveUser confirmed no existing user, continuing with creation of user '%s'\n", u.UserName)
		result, err := db.NamedExec((`INSERT INTO users (RoleId, UserName, Password) VALUES (:RoleId, :UserName, :Password)`), u)

		if err != nil {
			log.Printf("SaveUser error executing sql record : '%s'\n", err)
			return &User{}, err
		} else {
			affected, _ := result.RowsAffected()
			id, _ := result.LastInsertId()
			log.Printf("SaveUser insert returned result id '%d' affecting %d row(s).\n", id, affected)
		}
	} else {
		log.Printf("SaveUser Username already exists : '%v'\n", err)
	}

	return u, nil
}

func VerifyPassword(password, hashedPassword string) error {
	log.Printf("VerifyPassword comparing input against hashed value '%s'\n", hashedPassword)
	return bcrypt.CompareHashAndPassword([]byte(hashedPassword), []byte(password))
}

func LoginCheck(username string, password string) (string, error) {

	var err error

	u := User{}

	// Query database for matching user object
	err = db.QueryRowx("SELECT * FROM Users WHERE Username=?", username).StructScan(&u)

	log.Printf("LoginCheck retrieved user '%v' from database\n", u)

	if err != nil {
		return "", err
	}

	err = VerifyPassword(password, u.Password)

	if err != nil && err == bcrypt.ErrMismatchedHashAndPassword {
		log.Printf("LoginCheck says password doesn't match stored hash.\n")
		return "", err
	} else {
		log.Printf("LoginCheck verified password against stored hash.\n")
	}

	token, err := token.GenerateToken(uint(u.UserId))

	if err != nil {
		log.Printf("LoginCheck error generating token : '%s'\n", err)
		return "", err
	}

	return token, nil

}

func GetUserByID(uid uint) (User, error) {

	var u User

	// Query database for matching user object
	err := db.QueryRowx("SELECT * FROM users WHERE UserId=?", uid).StructScan(&u)
	if err != nil {
		return u, errors.New("user not found")
	}
	/*
		if err := DB.First(&u, uid).Error; err != nil {
			return u, errors.New("User not found!")
		}
	*/
	//u.PrepareGive()

	return u, nil

}

func GetUserByName(username string) (User, error) {

	var u User

	// Query database for matching user object
	err := db.QueryRowx("SELECT * FROM users WHERE UserName=?", username).StructScan(&u)
	if err != nil {
		return u, errors.New("user not found")
	}

	return u, nil
}

func GetUserRoleByID(uid uint) (UserRole, error) {

	var ur UserRole

	// Query database for matching user object
	log.Printf("GetUserRoleByID querying for userid '%d'\n", uid)
	err := db.QueryRowx("SELECT users.UserId, users.RoleId, users.UserName, users.Password, roles.RoleName, roles.ReadOnly, roles.Admin FROM users INNER JOIN roles ON users.RoleId = roles.RoleId WHERE users.UserId=?", uid).StructScan(&ur)
	if err != nil {
		log.Printf("GetUserRoleByID received error when querying database : '%s'\n", err)
		return ur, errors.New("GetUserRoleByID user not found")
	}

	return ur, nil
}

func GetUserRoleFromToken(c *gin.Context) (UserRole, error) {

	var ur UserRole

	user_id, err := token.ExtractTokenID(c)

	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return ur, err
	}

	// Query database for matching user object
	log.Printf("GetUserRoleFromToken querying for userid '%d'\n", user_id)
	err = db.QueryRowx("SELECT users.UserId, users.RoleId, users.UserName, users.Password, roles.RoleName, roles.ReadOnly, roles.Admin FROM users INNER JOIN roles ON users.RoleId = roles.RoleId WHERE users.UserId=?", user_id).StructScan(&ur)
	if err != nil {
		log.Printf("GetUserRoleFromToken received error when querying database : '%s'\n", err)
		return ur, errors.New("GetUserRoleFromToken user not found")
	}

	return ur, nil
}

func QueryUsers() ([]User, error) {
	var results []User

	// Query database for role definitions
	rows, err := db.Queryx("SELECT * FROM users")

	if err != nil {
		log.Printf("QueryUsers error executing sql record : '%s'\n", err)
		return results, err
	} else {
		// parse all the results into a slice
		for rows.Next() {
			var u User
			err = rows.StructScan(&u)
			if err != nil {
				log.Printf("QueryUsers error parsing sql record : '%s'\n", err)
				return results, err
			}
			results = append(results, u)

		}
		log.Printf("QueryUsers retrieved '%d' results\n", len(results))
	}

	return results, nil
}