package prompts

import (
	"os"
	"path/filepath"
	"strings"
)

// LoadAnalysisPrompt locates and reads a language-specific analysis prompt.
// Search order (developer-first, project-local preferred):
//  1. {projectRoot}/.grokkit/prompts/{language}.md
//  2. ~/.config/grokkit/prompts/{language}.md
//
// Returns os.ErrNotExist if none found so the command can give a clear, actionable error.
func LoadAnalysisPrompt(projectRoot, language string) (path, content string, err error) {
	if language == "" || language == "unknown" {
		language = "go"
	}
	language = strings.ToLower(language)

	// 1. Project-local (preferred for per-project customization)
	local := filepath.Join(projectRoot, ".grokkit", "prompts", language+".md")
	if data, readErr := os.ReadFile(local); readErr == nil {
		return local, string(data), nil
	}

	// 2. Global fallback
	home := os.Getenv("HOME")
	if home == "" {
		home = os.Getenv("USERPROFILE") // Windows
	}
	if home != "" {
		global := filepath.Join(home, ".config", "grokkit", "prompts", language+".md")
		if data, readErr := os.ReadFile(global); readErr == nil {
			return global, string(data), nil
		}
	}

	return "", "", os.ErrNotExist
}