package apps

import (
	"regexp"
	"strings"

	"github.com/jinzhu/gorm"
	// This is line from GORM documentation that imports database dialect
	_ "github.com/jinzhu/gorm/dialects/sqlite"
)

// ValidationError is error that holds multiple validation error messages
type ValidationError struct {
	Errors []string
}

func (v ValidationError) Error() string {
	return strings.Join(v.Errors, "\n")
}

// Label holds metadata about the application
type Label struct {
	Value string `json:"value"`
}

// AppState contains info about runnint application, it's not saved in the database
type AppState struct {
	State       string `json:"state"`
	CPUUsage    int    `json:"cpu_usage"`
	MemoryUsage int    `json:"memory_usage"`
}

// App keeps info about hosted application
type App struct {
	gorm.Model

	Name     string `json:"name" gorm:"primary_key"`
	SSHPort  int    `json:"ssh_port"`
	HTTPPort int    `json:"http_port"`
	Image    string `json:"image"`
	CPU      int    `json:"cpu"`    // percentage, 200 means two CPU
	Memory   int    `json:"memory"` // Limit in MB
	// Labels   []Label `json:"labels"` // username:cx or user_id:1

	State AppState `json:"state" gorm:"-"`
}

// Validate do basic checks of the struct values
func (a *App) Validate() []string {
	var errors []string

	nameRegExp := regexp.MustCompile(`^[a-z0-9_]{3,48}$`)
	if !nameRegExp.MatchString(a.Name) {
		errors = append(errors, "name can contain only characters, numbers and underscores and has to be between 3 and 48 characters")
	}

	if a.SSHPort < 0 && a.SSHPort > 65536 {
		errors = append(errors, "SSH port has to be between 0 and 65536, where 0 means disabled")
	}

	if a.HTTPPort < 1 && a.HTTPPort > 65536 {
		errors = append(errors, "HTTP port has to be between 1 and 65536")
	}

	if a.Image == "" {
		errors = append(errors, "image cannot be empty")
	}

	if a.CPU < 10 && a.CPU > 800 {
		errors = append(errors, "CPU value has be between 10 and 800")
	}

	if a.Memory < 32 && a.Memory > 16384 {
		errors = append(errors, "Memory value has be between 32 and 16384")
	}

	return errors
}