package parser

import (
	"fmt"
	"strings"
)

// Build builds an URI scheme from a pattern string
func Build(s string) (*Scheme, error){

	/* (1) Manage '/' at the start */
	if len(s) < 1 || s[0] != '/' {
		return nil, fmt.Errorf("URI must begin with '/'")
	}

	/* (2) Split by '/' */
	parts := strings.Split(s, "/")

	/* (3) Max exceeded */
	if len(parts)-2 > maxMatch {
		for i, p := range parts {
			fmt.Printf("%d: '%s'\n", i, p);
		}
		return nil, fmt.Errorf("URI must not exceed %d slash-separated components, got %d", maxMatch, len(parts))
	}

	/* (4) Build for each part */
	sch, err := buildScheme(parts)
	if err != nil {
		return nil, err
	}

	/* (5) Optimise */
	opti, err := sch.optimise()
	if err != nil {
		return nil, err
	}

	return &opti, nil

}