// Summary: Hexai MCP server entrypoint; parses flags and delegates to internal/hexaimcp.
package main

import (
	"flag"
	"fmt"
	"log"
	"os"

	"codeberg.org/snonux/hexai/internal"
	"codeberg.org/snonux/hexai/internal/appconfig"
	"codeberg.org/snonux/hexai/internal/hexaimcp"
)

func main() {
	defaultLog := defaultLogPath()
	logPath := flag.String("log", defaultLog, "path to log file (optional)")
	configPath := flag.String("config", "", "path to config file (optional)")
	promptsDir := flag.String("prompts-dir", "", "path to prompts directory (optional)")
	slashCommandSync := flag.Bool("slashcommand-sync", false, "enable slash command sync")
	slashCommandDir := flag.String("slashcommand-dir", "", "directory for slash command files")
	syncAll := flag.Bool("sync-all", false, "backfill all existing prompts and exit")
	showVersion := flag.Bool("version", false, "print version and exit")
	flag.Parse()

	if *showVersion {
		fmt.Println(internal.Version)
		return
	}

	// If prompts-dir is specified, set environment variable for RunWithFactory
	if *promptsDir != "" {
		os.Setenv("HEXAI_MCP_PROMPTS_DIR", *promptsDir)
	}
	if *slashCommandSync {
		os.Setenv("HEXAI_MCP_SLASHCOMMAND_SYNC", "true")
	}
	if *slashCommandDir != "" {
		os.Setenv("HEXAI_MCP_SLASHCOMMAND_DIR", *slashCommandDir)
	}

	// Handle backfill operation
	if *syncAll {
		if err := hexaimcp.RunBackfill(*logPath, *configPath); err != nil {
			log.Fatalf("backfill error: %v", err)
		}
		return
	}

	if err := hexaimcp.Run(*logPath, *configPath, os.Stdin, os.Stdout, os.Stderr); err != nil {
		log.Fatalf("server error: %v", err)
	}
}

// defaultLogPath returns the default MCP log file path in the state directory.
// Panics if state directory cannot be created.
func defaultLogPath() string {
	stateDir, err := appconfig.StateDir()
	if err != nil {
		panic(fmt.Sprintf("cannot create state directory: %v", err))
	}
	return fmt.Sprintf("%s/hexai-mcp-server.log", stateDir)
}