package env

import (
	"bufio"
	"flag"
	"os"
	"strings"

	"github.com/dmitriygnatenko/internal/interfaces"
)

// nolint:gosec
const (
	envPath = "../../config/.env"

	appPortEnv = "APP_PORT"

	dbHostEnv     = "DB_HOST"
	dbPortEnv     = "DB_PORT"
	dbNameEnv     = "DB_NAME"
	dbUserEnv     = "DB_USER"
	dbPasswordEnv = "DB_PASSWORD"

	smtpHostEnv     = "SMTP_HOST"
	smtpPortEnv     = "SMTP_PORT"
	smtpUserEnv     = "SMTP_USER"
	smtpPasswordEnv = "SMTP_PASSWORD"

	staticVersionEnv = "STATIC_VERSION"
	gaEnabledEnv     = "GA_ENABLED"

	adminEmailEnv    = "ADMIN_EMAIL"
	adminUserEnv     = "ADMIN_USER"
	adminPasswordEnv = "ADMIN_PASSWORD"
)

type env struct {
	appPort string

	dbHost     string
	dbPort     string
	dbName     string
	dbUser     string
	dbPassword string

	smtpHost     string
	smtpPort     string
	smtpUser     string
	smtpPassword string

	staticVersion string
	gaEnabled     bool

	adminEmail    string
	adminUser     string
	adminPassword string
}

func Init() (interfaces.IEnv, error) {
	res := &env{}

	path := flag.String("config", envPath, "path to .env config")
	flag.Parse()

	file, err := os.Open(*path)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" {
			continue
		}

		if strings.HasPrefix(line, "#") {
			continue
		}

		parts := strings.Split(line, "=")
		if len(parts) < 2 {
			continue
		}

		set(res, parts[0], parts[1])
	}

	if err = scanner.Err(); err != nil {
		return nil, err
	}

	return res, err
}

func set(res *env, key string, value string) {
	switch key {
	case appPortEnv:
		res.appPort = value

	case dbHostEnv:
		res.dbHost = value
	case dbPortEnv:
		res.dbPort = value
	case dbNameEnv:
		res.dbName = value
	case dbUserEnv:
		res.dbUser = value
	case dbPasswordEnv:
		res.dbPassword = value

	case smtpPortEnv:
		res.smtpPort = value
	case smtpHostEnv:
		res.smtpHost = value
	case smtpUserEnv:
		res.smtpUser = value
	case smtpPasswordEnv:
		res.smtpPassword = value

	case staticVersionEnv:
		res.staticVersion = value
	case gaEnabledEnv:
		res.gaEnabled = value == "true"

	case adminEmailEnv:
		res.adminEmail = value
	case adminUserEnv:
		res.adminUser = value
	case adminPasswordEnv:
		res.adminPassword = value
	}
}

func (e *env) GetAppPort() string {
	return e.appPort
}

func (e *env) GetDBHost() string {
	return e.dbHost
}

func (e *env) GetDBPort() string {
	return e.dbPort
}

func (e *env) GetDBName() string {
	return e.dbName
}

func (e *env) GetDBUser() string {
	return e.dbUser
}

func (e *env) GetDBPassword() string {
	return e.dbPassword
}

func (e *env) GetSMTPPort() string {
	return e.smtpPort
}

func (e *env) GetSMTPHost() string {
	return e.smtpHost
}

func (e *env) GetSMTPUser() string {
	return e.smtpUser
}

func (e *env) GetSMTPPassword() string {
	return e.smtpPassword
}

func (e *env) GetStaticVersion() string {
	return e.staticVersion
}

func (e *env) IsGAEnabled() bool {
	return e.gaEnabled
}

func (e *env) GetAdminEmail() string {
	return e.adminEmail
}

func (e *env) GetAdminUser() string {
	return e.adminUser
}

func (e *env) GetAdminPassword() string {
	return e.adminPassword
}