package main

import (
	"errors"
	"fmt"
	"os"
	"os/exec"

	glider_ssh "github.com/gliderlabs/ssh"
	"go.lindenii.runxiyu.org/lindenii-common/cmap"
)

type pack_to_hook_t struct {
	session       glider_ssh.Session
	pubkey        string
	direct_access bool
	repo_path     string
}

var pack_to_hook_by_cookie = cmap.Map[string, pack_to_hook_t]{}

// ssh_handle_receive_pack handles attempts to push to repos.
func ssh_handle_receive_pack(session glider_ssh.Session, pubkey string, repo_identifier string) (err error) {

	// Here "access" means direct maintainer access. access=false doesn't
	// necessarily mean the push is declined. This decision is delegated to
	// the pre-receive hook, which is then handled by git_hooks_handle.go
	// while being aware of the refs to be updated.
	repo_path, access, contrib_requirements, is_registered_user, err := get_repo_path_perms_from_ssh_path_pubkey(session.Context(), repo_identifier, pubkey)

	repo_path, direct_access, contrib_requirements, is_registered_user, err := get_repo_path_perms_from_ssh_path_pubkey(session.Context(), repo_identifier, pubkey)

	if err != nil {
		return err
	}

	if !access {

	if !direct_access {

		switch contrib_requirements {
		case "closed":

			if !access {

			if !direct_access {

				return errors.New("You need direct access to push to this repo.")
			}
		case "registered_user":
			if !is_registered_user {
				return errors.New("You need to be a registered user to push to this repo.")
			}
		case "ssh_pubkey":
			if pubkey == "" {
				return errors.New("You need to have an SSH public key to push to this repo.")
			}
		case "public":
		default:
			panic("unknown contrib_requirements value " + contrib_requirements)
		}
	}

	cookie, err := random_urlsafe_string(16)
	if err != nil {
		fmt.Fprintln(session.Stderr(), "Error while generating cookie:", err)
	}

	pack_to_hook_by_cookie.Store(cookie, pack_to_hook_t{
		session:       session,
		pubkey:        pubkey,

		direct_access: access,

		direct_access: direct_access,

		repo_path:     repo_path,
	})
	defer pack_to_hook_by_cookie.Delete(cookie)
	// The Delete won't execute until proc.Wait returns unless something
	// horribly wrong such as a panic occurs.

	proc := exec.CommandContext(session.Context(), "git-receive-pack", repo_path)
	proc.Env = append(os.Environ(),
		"LINDENII_FORGE_HOOKS_SOCKET_PATH="+config.Hooks.Socket,
		"LINDENII_FORGE_HOOKS_COOKIE="+cookie,
	)
	proc.Stdin = session
	proc.Stdout = session
	proc.Stderr = session.Stderr()

	err = proc.Start()
	if err != nil {
		fmt.Fprintln(session.Stderr(), "Error while starting process:", err)
		return err
	}

	err = proc.Wait()
	if exitError, ok := err.(*exec.ExitError); ok {
		fmt.Fprintln(session.Stderr(), "Process exited with error", exitError.ExitCode())
	} else if err != nil {
		fmt.Fprintln(session.Stderr(), "Error while waiting for process:", err)
	}

	return err
}