// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package agent

import (
	"bytes"
	"text/template"
)

type (
	systemPromptData struct {
		Instructions string
		Handoffs     []systemPromptHandoff
	}

	systemPromptHandoff struct {
		Name        string
		Description string
	}
)

var systemPromptTmpl = template.Must(template.New("system_prompt").Parse(
	`{{- .Instructions -}}
{{- if .Handoffs }}

## Handoffs
You can transfer the conversation to a more specialized agent when appropriate:
{{ range .Handoffs -}}
- {{ .Name }}{{ with .Description }}: {{ . }}{{ end }}
{{ end -}}
{{- end -}}
`))

func buildSystemPrompt(data systemPromptData) string {
	var buf bytes.Buffer

	_ = systemPromptTmpl.Execute(&buf, data)

	return buf.String()
}