package config

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func write(t *testing.T, dir, name, content string) {
	t.Helper()
	if err := os.WriteFile(filepath.Join(dir, name), []byte(content), 0o600); err != nil {
		t.Fatal(err)
	}
}

func TestLoadHappyPath(t *testing.T) {
	dir := t.TempDir()
	write(t, dir, "team-x.json", `{
		"agent_id": "alice",
		"plugin": "plexum-fabric-channel",
		"fabric": {"guild_node_id": "gn_1", "channel_id": "ch_x"}
	}`)
	write(t, dir, "team-y.json", `{
		"agent_id": "bob",
		"plugin": "plexum-fabric-channel",
		"fabric": {"guild_node_id": "gn_2", "channel_id": "ch_y"}
	}`)
	got, err := Load(dir)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 2 {
		t.Fatalf("len = %d", len(got))
	}
}

func TestLoadSkipsOtherPlugins(t *testing.T) {
	dir := t.TempDir()
	write(t, dir, "mine.json", `{"agent_id":"a","plugin":"plexum-fabric-channel","fabric":{"guild_node_id":"g","channel_id":"c"}}`)
	write(t, dir, "other.json", `{"agent_id":"a","plugin":"another-plugin"}`)
	write(t, dir, "no-plugin.json", `{"agent_id":"a"}`)
	got, err := Load(dir)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 1 || got[0].PlexumChannelName != "mine" {
		t.Errorf("got = %+v", got)
	}
}

func TestLoadErrorsOnMissingFabricFields(t *testing.T) {
	dir := t.TempDir()
	write(t, dir, "broken.json", `{"agent_id":"a","plugin":"plexum-fabric-channel"}`)
	_, err := Load(dir)
	if err == nil || !strings.Contains(err.Error(), "fabric") {
		t.Errorf("err = %v", err)
	}
}

func TestLoadErrorsOnMissingAgentID(t *testing.T) {
	dir := t.TempDir()
	write(t, dir, "broken.json", `{"plugin":"plexum-fabric-channel","fabric":{"guild_node_id":"g","channel_id":"c"}}`)
	_, err := Load(dir)
	if err == nil || !strings.Contains(err.Error(), "agent_id") {
		t.Errorf("err = %v", err)
	}
}

func TestLoadMissingDirEmpty(t *testing.T) {
	got, err := Load(filepath.Join(t.TempDir(), "nope"))
	if err != nil || got != nil {
		t.Errorf("missing dir: err=%v got=%v", err, got)
	}
}

func TestIndex(t *testing.T) {
	bindings := []FabricBinding{
		{PlexumChannelName: "a", AgentID: "u", FabricGuildNodeID: "g1", FabricChannelID: "c1"},
		{PlexumChannelName: "b", AgentID: "u", FabricGuildNodeID: "g1", FabricChannelID: "c2"},
	}
	idx := Index(bindings)
	if idx[Key("g1", "c1")] == nil || idx[Key("g1", "c1")].PlexumChannelName != "a" {
		t.Errorf("idx miss for c1")
	}
	if idx[Key("g1", "c2")] == nil || idx[Key("g1", "c2")].PlexumChannelName != "b" {
		t.Errorf("idx miss for c2")
	}
	if idx[Key("g1", "ghost")] != nil {
		t.Errorf("ghost entry")
	}
}