// bridge is a stdio↔HTTP adapter that lets Claude Code connect to the
// supervisor MCP server via the stdio transport.
//
// Claude Code spawns this binary as a subprocess and communicates over
// stdin/stdout. Each newline-delimited JSON-RPC message from stdin is
// forwarded to the supervisor HTTP server and the response is written back.
//
// Usage:
//
//	SUPERVISOR_URL=http://localhost:3200/mcp bridge
package main

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	url := os.Getenv("SUPERVISOR_URL")
	if url == "" {
		url = "http://localhost:3200/mcp"
	}

	client := &http.Client{}
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]byte, 1024*1024), 1024*1024)

	for scanner.Scan() {
		line := scanner.Bytes()
		if len(bytes.TrimSpace(line)) == 0 {
			continue
		}

		req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(line))
		if err != nil {
			fmt.Fprintf(os.Stderr, "bridge: build request: %v\n", err)
			continue
		}
		req.Header.Set("Content-Type", "application/json")

		resp, err := client.Do(req)
		if err != nil {
			fmt.Fprintf(os.Stderr, "bridge: request failed: %v\n", err)
			continue
		}
		io.Copy(os.Stdout, resp.Body)
		resp.Body.Close()
		os.Stdout.Write([]byte("\n"))
	}

	if err := scanner.Err(); err != nil {
		fmt.Fprintf(os.Stderr, "bridge: scanner: %v\n", err)
		os.Exit(1)
	}
}