// Package template makes it possible to describe templates and patterns in yaml files and
// to render them to SVG.
package template

import (
	"fmt"
	"os"
	"unicode"

	"gopkg.in/yaml.v3"
)

// Sizes defines a map with the size name and the size value.
type Sizes map[string]float64

// Template contains the generic information to draw a specific clothing pattern.
type Template struct {
	Points `yaml:"points"`
	Panels `yaml:"panels"`
}

// LoadPattern reads and decodes a [Request] from a yaml file.
func LoadPattern(name string) (Request, error) {
	fh, err := os.Open(name)
	if err != nil {
		return Request{}, fmt.Errorf("open pattern file %q: %w", name, err)
	}

	pat := Request{}

	err = yaml.NewDecoder(fh).Decode(&pat)
	if err != nil {
		return Request{}, fmt.Errorf("decode content of file %q as yaml: %w", name, err)
	}

	return pat, nil
}

func startCase(text string) string {
	output := make([]rune, len(text))

	for i, val := range text {
		switch {
		case i == 0:
			output[i] = unicode.ToUpper(val)
		case val == '_':
			output[i] = ' '
		case output[i-1] == ' ':
			output[i] = unicode.ToUpper(val)
		default:
			output[i] = val
		}
	}

	return string(output)
}