package test

import (
	"context"
	"io/ioutil"
	"path/filepath"
	"testing"
	"time"

	"github.com/stretchr/testify/require"
	"github.com/stretchr/testify/suite"
	"gitoa.ru/go-4devs/config"
)

const (
	DSN       = "pgsql://user@pass:127.0.0.1:5432"
	Namespace = "fdevs"
	AppName   = "config"
)

func Run(t *testing.T, provider config.Provider, read []Read) {
	t.Helper()

	prov := &ProviderSuite{
		provider: provider,
		read:     read,
	}
	suite.Run(t, prov)
}

type ProviderSuite struct {
	suite.Suite
	provider config.Provider
	read     []Read
}

type Read struct {
	Key    []string
	Assert func(t *testing.T, v config.Value)
}

const ConfigJSON = `{"duration":1260000000000,"enabled":true}`

type Config struct {
	Duration time.Duration
	Enabled  bool
}

func NewReadConfig(key ...string) Read {
	ex := &Config{
		Duration: 21 * time.Minute,
		Enabled:  true,
	}

	return NewReadUnmarshal(ex, &Config{}, key...)
}

func NewReadUnmarshal(expected, target interface{}, key ...string) Read {
	return Read{
		Key: key,
		Assert: func(t *testing.T, v config.Value) {
			t.Helper()
			require.NoErrorf(t, v.Unmarshal(target), "unmarshal")
			require.Equal(t, expected, target, "unmarshal")
		},
	}
}

func Time(value string) time.Time {
	t, _ := time.Parse(time.RFC3339, value)

	return t
}

// nolint: cyclop
func NewRead(expected interface{}, key ...string) Read {
	return Read{
		Key: key,
		Assert: func(t *testing.T, v config.Value) {
			t.Helper()
			var (
				val   interface{}
				err   error
				short interface{}
			)
			switch expected.(type) {
			case bool:
				val, err = v.ParseBool()
				short = v.Bool()
			case int:
				val, err = v.ParseInt()
				short = v.Int()
			case int64:
				val, err = v.ParseInt64()
				short = v.Int64()
			case uint:
				val, err = v.ParseUint()
				short = v.Uint()
			case uint64:
				val, err = v.ParseUint64()
				short = v.Uint64()
			case string:
				val, err = v.ParseString()
				short = v.String()
			case float64:
				val, err = v.ParseFloat64()
				short = v.Float64()
			case time.Duration:
				val, err = v.ParseDuration()
				short = v.Duration()
			case time.Time:
				val, err = v.ParseTime()
				short = v.Time()
			default:
				require.Fail(t, "unexpected type", "type:%+T", expected)
			}

			require.Equalf(t, val, short, "type:%T", expected)
			require.NoErrorf(t, err, "type:%T", expected)
			require.Equalf(t, expected, val, "type:%T", expected)
		},
	}
}

func (ps *ProviderSuite) TestReadKeys() {
	ctx := context.Background()

	for _, read := range ps.read {
		val, err := ps.provider.Value(ctx, read.Key...)
		require.NoError(ps.T(), err, read.Key)
		read.Assert(ps.T(), val)
	}
}

func LoadConfig(t *testing.T, path string) []byte {
	t.Helper()

	file, err := ioutil.ReadFile(filepath.Clean(path))
	require.NoError(t, err)

	return file
}