package main

// The module's own forge key (novox/hq ADR 0466 §2, issue 1484): mesh-sdk's key keeper, kind builder, for the
// module's account in its home. It makes ~/.ssh/mesh_ed25519 when it is missing and writes one entry to this
// module's `keys` state at <node>.<account>, which gitea's provider reads to register the key on the forge user
// that reads and pushes nothing (ADR 0466 §3).

import (
	"context"
	"fmt"
	"os"
	"os/user"
	"strings"
	"time"

	stdio "git.novox.be/novox/mesh-sdk/go"
	"git.novox.be/novox/mesh-sdk/go/forgekey"
)

// keeperFor is this module's keeper: go/forgekey's, of kind builder, for account in home on node, whose entry lies
// at <node>.<account> of the keys state.
func keeperFor(home, node, account string, run forgekey.Runner, state forgekey.KeyPutter) *forgekey.KeyKeeper {
	return &forgekey.KeyKeeper{Home: home, Node: node, Account: account, Kind: forgekey.KindBuilder, Run: run, State: state, Now: time.Now}
}

// startKeeper runs the keeper when the runtime launched this process for a node: outside a launch — a build, a
// check — there is no state to put the entry in.
func startKeeper(ctx context.Context) {
	node := strings.TrimSpace(os.Getenv("MESH_NODE"))
	u, err := user.Current()
	if node == "" || err != nil || u.HomeDir == "" {
		return
	}
	k := keeperFor(u.HomeDir, node, u.Username, forgekey.ExecRunner, keysState{})
	k.Keep(ctx, func(f string, a ...any) { fmt.Fprintf(os.Stderr, "[mesh-build-node] "+f+"\n", a...) })
}

type keysState struct{}

func (keysState) Put(key string, value any) (uint64, error) {
	return stdio.State("keys").Put(key, value)
}