package mdconv

import (
	"io"
	"text/template"

	"tildegit.org/tjp/sliderule/gopher"
	"tildegit.org/tjp/sliderule/gopher/gophermap/internal"
)

func Convert(wr io.Writer, doc gopher.MapDocument, overrides *template.Template) error {
	tmpl, err := baseTmpl.Clone()
	if err != nil {
		return err
	}

	tmpl, err = internal.AddOverrides(tmpl, overrides)
	if err != nil {
		return err
	}

	for _, item := range internal.RenderItems(doc) {
		if err := tmpl.ExecuteTemplate(wr, item.Template, item.Object); err != nil {
			return err
		}
	}

	return nil
}

var baseTmpl = template.Must(template.New("mdconv").Parse(`
{{ define "header" }}{{ end }}

{{ define "message" -}}
` + "```" + `
{{.}}
` + "```" + `

{{ end }}

{{ define "link" -}}
[{{.Display}}]({{ if .Hostname | and .Port }}gopher://{{.Hostname}}:{{.Port}}{{ end }}{{.Selector}})

{{ end }}

{{ define "image" -}}
![{{.Display}}]({{ if .Hostname | and .Port }}gopher://{{.Hostname}}:{{.Port}}{{ end }}{{.Selector}})

{{ end }}

{{ define "footer" }}{{ end }}
`))