// Package prompts provides embedded prompt templates for the layered preamble.
package prompts

import (
	_ "embed"
	"fmt"
	"os"
	"strings"
	"time"
)

//go:embed system_prompt.md
var DefaultSystemPrompt string

//go:embed session_9p.md
var Session9P string

//go:embed session_dbus.md
var SessionDBus string



// Environment renders the environment context block with live values.
func Environment(cwd, platform string, isGitRepo bool, sandbox string) string {
	date := time.Now().Format("2006-01-02")
	gitStr := "false"
	if isGitRepo {
		gitStr = "true"
	}
	return fmt.Sprintf(`# Environment

- Working directory: %s
- Platform: %s
- Current date: %s
- Is git repo: %s
- Sandbox: %s

Tools run in a sandbox with restricted filesystem access. Unexpected permission denied errors are usually caused by sandbox restrictions. Use `+"`elevated: true`"+` to bypass.`,
		cwd, platform, date, gitStr, sandbox)
}

// OperationalModel returns the appropriate operational model text based on flags.
func OperationalModel(enable9P, enableDBus bool, envVars map[string]string) string {
	expand := func(s string) string {
		return os.Expand(s, func(key string) string {
			if v, ok := envVars[key]; ok {
				return v
			}
			return os.Getenv(key)
		})
	}
	var parts []string
	if enable9P {
		parts = append(parts, expand(Session9P))
	}
	if enableDBus {
		parts = append(parts, expand(SessionDBus))
	}
	return strings.Join(parts, "\n")
}

// ResolveSystemPrompt expands env vars in overridePath, then tries to read the
// file from the filesystem. If the file doesn't exist, the embedded default is
// returned.
func ResolveSystemPrompt(overridePath string) string {
	if overridePath == "" {
		return DefaultSystemPrompt
	}
	expanded := os.Expand(overridePath, os.Getenv)
	data, err := os.ReadFile(expanded)
	if err == nil {
		return strings.TrimRight(string(data), "\n")
	}
	// Fall through to embedded default.
	fmt.Fprintf(os.Stderr, "system_prompt %q: %v (using default)\n", expanded, err)
	return DefaultSystemPrompt
}