package http

import "net/url"
import "net/http"
import "html/template"
import "git.tebibyte.media/sashakoshka/step"
import shttp "git.tebibyte.media/sashakoshka/step/http"

var _ step.FuncProvider = new(Provider)

// Provider provides HTTP and URL functions.
type Provider struct {
	
}

// Package fulfills the step.Provider interface.
func (this *Provider) Package () string {
	return "http"
}

// FuncMap fulfills the step.FuncProvider interface.
func (this *Provider) FuncMap () template.FuncMap {
	return template.FuncMap {
		"statusText":    http.StatusText,
		"parseQuery":    funcParseQuery,
		"parseForm":     funcParseForm,
		"error":         funcError,
		"redirect":      funcRedirect,
		"queryEscape":   url.QueryEscape,
		"queryUnescape": url.QueryUnescape,
	}
}

func funcParseQuery (query string) url.Values {
	// wrapped here because the query might contain all sorts of nonsense,
	// and returning an error in a template function causes everything to
	// stop rather ungracefully
	values, err := url.ParseQuery(query)
	if err != nil { return nil }
	return values
}

func funcError (status int, message any) (string, error) {
	return "", shttp.Error {
		Status:  status,
		Message: message,
	}
}

func funcRedirect (status int, pat string) (string, error) {
	return "", shttp.Redirect {
		Status:   status,
		Location: pat,
	}
}

func funcParseForm (req *http.Request) url.Values {
	err := req.ParseForm()
	if err != nil { return nil }
	return req.Form
}