package config_test

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

	"gitea.auvem.com/go-toolkit/config"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

type testSchema struct {
	Name  string `mapstructure:"name" validate:"required"`
	Port  int    `mapstructure:"port" validate:"required,min=1"`
	Extra string `mapstructure:"extra"`
}

func writeConfig(t *testing.T, dir, content string) {
	t.Helper()
	require.NoError(t, os.WriteFile(filepath.Join(dir, "app.yaml"), []byte(content), 0o644))
}

func TestLoadAndC(t *testing.T) {
	dir := t.TempDir()
	writeConfig(t, dir, "name: svc\nport: 8080\n")

	m := config.NewManager[testSchema]("app", "yaml", dir)
	require.NoError(t, m.Load())
	assert.Equal(t, "svc", m.C().Name)
	assert.Equal(t, 8080, m.Config().Port)
}

func TestPostLoadRevalidates(t *testing.T) {
	dir := t.TempDir()
	writeConfig(t, dir, "name: svc\nport: 8080\nextra: ok\n")

	m := config.NewManager[testSchema]("app", "yaml", dir).WithOpts(&config.ManagerOpts[testSchema]{
		PostLoad: func(cfg *testSchema) error {
			cfg.Name = ""
			return nil
		},
	})

	err := m.Load()
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "post-load")
}

func TestPostLoadSuccess(t *testing.T) {
	dir := t.TempDir()
	writeConfig(t, dir, "name: svc\nport: 8080\n")

	m := config.NewManager[testSchema]("app", "yaml", dir).WithOpts(&config.ManagerOpts[testSchema]{
		PostLoad: func(cfg *testSchema) error {
			cfg.Extra = "derived"
			return nil
		},
	})

	require.NoError(t, m.Load())
	assert.Equal(t, "derived", m.C().Extra)
}

func TestRootDir(t *testing.T) {
	dir := t.TempDir()
	marker := filepath.Join(dir, ".marker")
	require.NoError(t, os.WriteFile(marker, []byte("x"), 0o644))

	orig, err := os.Getwd()
	require.NoError(t, err)
	t.Cleanup(func() { _ = os.Chdir(orig) })

	sub := filepath.Join(dir, "sub")
	require.NoError(t, os.Mkdir(sub, 0o755))
	require.NoError(t, os.Chdir(sub))

	got, err := config.RootDir(".marker", 1)
	require.NoError(t, err)
	absDir, err := filepath.EvalSymlinks(dir)
	require.NoError(t, err)
	gotEval, err := filepath.EvalSymlinks(got)
	require.NoError(t, err)
	assert.Equal(t, absDir, gotEval)
}

func TestMustRootDirPanics(t *testing.T) {
	assert.Panics(t, func() {
		config.MustRootDir("definitely-missing-marker-xyz", 0)
	})
}