package got

import (
	"text/template"

	. "git.eugeniocarvalho.dev/eugeniucarvalho/apicodegen/common"
	G "github.com/dave/jennifer/jen"
)

var (
	environmentStmtsTmpl *template.Template
	environmentStmtsErr  error
)

func init() {

	environmentStmtsTmpl, environmentStmtsErr = ParseTemplate(`

	import (
		"os"
		"fmt"
		common "git.eugeniocarvalho.dev/eugeniucarvalho/apicodegen/common"
	)
	
	var (
		{{range .variables}} {{.CamelID}} = "{{.Default}}"
		{{end}}
		value     string
		variables = []common.EnvironmentVariable{
			{{range .variables}}{
				ID:          "{{.ID}}",
				Description: "{{.Description}}",
				Required:    {{.Required}},
				Reference:  & {{.CamelID}},
				Default:     "{{.Default}}",
			},{{end}}
		}
	)
	
	func init(){
		for _, variable := range variables {			
			value = os.Getenv(variable.ID)

			if variable.Required && value == "" &&  *variable.Reference == "" {
				panic(fmt.Errorf("Environment Variable '%s' not defined! %s", variable.ID, variable.Description))
			}
			
			if value != "" {
				// remove in future
				common.Setenv(variable.ID, value)
				*variable.Reference = value
			}
		}
	}

	func InitEnvironment() error {
		fmt.Println("Environment...")
		// for _, pair := range os.Environ() {
		// 	fmt.Printf("\t├ %s\n",pair)
		// }
		for _, variable := range variables {
			fmt.Printf("\t├ %s: %s\n",variable.ID, *variable.Reference)
		}
		return nil
	}`)
}

func CreateEnvironment(p *Project) error {

	for id, environment := range p.Environment {
		environment.CamelID = UnderToCamel(id)
	}

	var (
		context = map[string]interface{}{
			"variables": p.Environment,
		}
	)

	out, _ := TemplateToString(environmentStmtsTmpl, context)

	file := G.NewFile("env")

	file.Id(out)

	return Write(p.Paths.Build("/%s/env/variables.go", p.Package), file)
}