package df

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
	"text/template"

	"github.com/iancoleman/strcase"
)

var frontendTemplate = template.Must(template.New("").Parse(`// Code generated by legendsbrowser; DO NOT EDIT.
{{- range $name, $obj := $.Objects }}
export interface {{ $obj.Name }} {
	{{- range $fname, $field := $obj.Fields }}
	{{- if not (and (eq $fname "type") (not (not $obj.SubTypes))) }}
	{{ $field.JsonTypeLine }};
	{{- end }}
	{{- end }}
	{{- if not (not $obj.SubTypes) }}
	Details: any;
	{{- end }}
}
{{- end }}
`))

func generateFrontendCode(objects *Metadata) error {
	file, _ := json.MarshalIndent(objects, "", "  ")
	_ = ioutil.WriteFile("model.json", file, 0644)

	f, err := os.Create("../frontend/src/app/types.ts")
	if err != nil {
		return err
	}
	defer f.Close()

	var buf bytes.Buffer
	err = frontendTemplate.Execute(&buf, struct {
		Objects *Metadata
		Modes   []bool
	}{
		Objects: objects,
		Modes:   []bool{false, true},
	})
	if err != nil {
		return err
	}

	_, err = f.Write(buf.Bytes())
	return err
}

func (f Field) JsonTypeLine() string {
	m := ""
	if f.Multiple {
		m = "[]"
	}
	t := f.Type
	if f.Type == "int" {
		t = "number"
	}
	if f.Type == "bool" {
		t = "boolean"
	}
	if f.Type == "array" {
		t = *f.ElementType + "[]"
	}
	if f.Type == "map" {
		t = "{ [key:number]:" + *f.ElementType + "; }"
	}
	if f.Type == "object" {
		t = *f.ElementType
	}
	return fmt.Sprintf("%s: %s%s", strcase.ToLowerCamel(f.Name), t, m)
}