package render

// light renderer package that used for generating html templates
// loading the template files from views folder
// using part folder as template parts
// using tag folder as templates of html tags

import (
	"api_manager/lib"
	"os"
	"strings"
)

// loading default head and foot template and adding custom string in the middle
func Template_with_string(str string) string {
	// loading head.html and foot.html
	// handling error by lib function and exiting if it occures
	head, err := os.ReadFile(Get_template("head",""));	lib.Handle_err(err, map[string]string{"die":"1"})
	foot, err := os.ReadFile(Get_template("foot",""));	lib.Handle_err(err, map[string]string{"die":"1"})

	// combining html parts
	template := "" + string(head) + str + string(foot)

	lib.Debug(template,"Template_with_string") // debuging the template 
	return template
}

// loading default head and foot template and adding html template from file in the middle
func Template_with_page(str string) string {
	// loading head.html and foot.html
	// handling error by lib function and exiting if it occures
	head, err := os.ReadFile(Get_template("head",""));	lib.Handle_err(err, map[string]string{"die":"1"})
	foot, err := os.ReadFile(Get_template("foot",""));	lib.Handle_err(err, map[string]string{"die":"1"})
	// loading custom html template file
	page, err := os.ReadFile(Get_template(str,"part"));	lib.Handle_err(err, map[string]string{"die":"1"})

	// combining html parts
	template := "" + string(head) + string(page) + string(foot)

	lib.Debug(template,"Template_with_page") // debuging the template output
	return template
}

// loading default head and foot template and adding html template from tag file in the middle
func Template_of_tag(html_tag string) string {
	// loading head.html and foot.html
	// handling error by lib function and exiting if it occures
	tag, err := os.ReadFile(Get_template(html_tag,"tag"));	lib.Handle_err(err, map[string]string{"die":"1"})

	lib.Debug(string(tag),"Template_of_tag") // debuging the template output
	return string(tag)
}

// loading default head and foot template and adding html template from part file in the middle
func Template_of_part(part_name string) string {
	// loading head.html and foot.html
	// handling error by lib function and exiting if it occures
	head, err := os.ReadFile(Get_template("head",""));	lib.Handle_err(err, map[string]string{"die":"1"})
	foot, err := os.ReadFile(Get_template("foot",""));	lib.Handle_err(err, map[string]string{"die":"1"})
	page, err := os.ReadFile(Get_template(part_name,"part"));	lib.Handle_err(err, map[string]string{"die":"1"})


	// combining html parts
	template := "" + string(head) + string(page) + string(foot)
	lib.Debug(template,"Template_of_part") // debuging the template output

	return template
}

// getting template string and replacing templating tags with variables
func Put_vars_to_template(template string, vars map[string]string) string {
	// run through vars array gettin key as tag to find in template and value as value to replace it with
	for tag, value := range vars {
		// find the tag and replace it with value
		template = strings.Replace(template, "{{"+tag+"}}", value, 1)
	}

	lib.Debug(template,"Put_vars_to_template") // debuging the template output
	return template
}


// searchin default folder and retriving the template files in web views folder
// type of template searching for sub folder in views
func Get_template(path_to_template string, type_of_template string) string{
	path := ""
	if type_of_template == ""{
		path = lib.Project_dir()+"/web/views/"+path_to_template+".html";
	}else {
		path = lib.Project_dir()+"/web/views/"+type_of_template+"/"+path_to_template+".html";
	}

	lib.Debug(path,"Get_template") // debuging the template 
	return path;
}