package config

import (
	"os"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const validKey = "sha256:0000000000000000000000000000000000000000000000000000000000000000"

func setValid(t *testing.T) {
	t.Setenv("MASTER_URL", "wss://10.0.0.5:8090/agent")
	t.Setenv("MASTER_KEY", validKey)
	t.Setenv("AGENT_TOKEN", "pua_abc")
	t.Setenv("SELF_ID", "")
	t.Setenv("LOG_LEVEL", "")
}

func TestLoad_Valid(t *testing.T) {
	setValid(t)
	cfg, err := Load()
	require.NoError(t, err)
	host, _ := os.Hostname()
	assert.Equal(t, &Config{
		MasterURL: "wss://10.0.0.5:8090/agent", MasterKey: validKey, Token: "pua_abc",
		SelfID: host, LogLevel: "info",
	}, cfg)
}

func TestLoad_Invalid(t *testing.T) {
	cases := []struct {
		name, key, value, wantErr string
	}{
		{"missing url", "MASTER_URL", "", "MASTER_URL is required"},
		{"plain ws", "MASTER_URL", "ws://10.0.0.5:8090/agent", "MASTER_URL must start with wss://"},
		{"missing key", "MASTER_KEY", "", "MASTER_KEY is required"},
		{"malformed key", "MASTER_KEY", "abc", "MASTER_KEY must look like sha256:<64 hex>"},
		{"missing token", "AGENT_TOKEN", "", "AGENT_TOKEN is required"},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			setValid(t)
			t.Setenv(c.key, c.value)
			_, err := Load()
			assert.ErrorContains(t, err, c.wantErr)
		})
	}
}