package analyze

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

	"gmgauthier.com/grokkit/internal/git"
	"gmgauthier.com/grokkit/internal/linter"
)

// DiscoverSourceFiles finds all supported source files in a directory tree.
// Exported for use by MCP server and other packages.
func DiscoverSourceFiles(root string) ([]string, error) {
	var files []string
	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		name := info.Name()
		if info.IsDir() {
			if strings.HasPrefix(name, ".") && name != "." && name != ".." ||
				name == "node_modules" || name == "vendor" || name == "build" || name == "dist" {
				return filepath.SkipDir
			}
			return nil
		}

		if _, detectErr := linter.DetectLanguage(path); detectErr == nil {
			files = append(files, path)
		}
		return nil
	})
	return files, err
}

// BuildProjectContext builds a context string for analysis prompts.
// Exported for use by MCP server.
func BuildProjectContext(dir string, files []string) string {
	var sb strings.Builder
	sb.WriteString("Project Root: " + dir + "\n\n")
	_, _ = fmt.Fprintf(&sb, "Total source files discovered: %d\n\n", len(files))

	sb.WriteString("Key files (top-level view):\n")
	for _, f := range files {
		rel, _ := filepath.Rel(dir, f)
		if strings.Count(rel, string(filepath.Separator)) <= 2 {
			sb.WriteString("  - " + rel + "\n")
		}
		if sb.Len() > 2500 {
			break
		}
	}

	// Add git remotes if available
	if out, err := git.Run([]string{"remote", "-v"}); err == nil && out != "" {
		sb.WriteString("\nGit Remotes:\n" + out + "\n")
	}

	return sb.String()
}