package dbimpl

import (
	"fmt"
	"testing"

	"github.com/stretchr/testify/require"

	"github.com/grafana/grafana/pkg/setting"
)

var invalidUTF8ByteSequence = []byte{0xff, 0xfe, 0xfd}

func setSectionKeyValues(section *setting.DynamicSection, m map[string]string) {
	for k, v := range m {
		section.Key(k).SetValue(v)
	}
}

func newTestConfGetter(m map[string]string, keyPrefix string) confGetter {
	section := setting.NewCfg().SectionWithEnvOverrides("entity_api")
	setSectionKeyValues(section, m)

	return newConfGetter(section, keyPrefix)
}

func TestSectionGetter(t *testing.T) {
	t.Parallel()

	var (
		key          = "the key"
		keyBoolTrue  = "I'm true"
		keyBoolFalse = "not me!"
		prefix       = "this is some prefix"
		val          = string(invalidUTF8ByteSequence)
	)

	t.Run("with prefix", func(t *testing.T) {
		t.Parallel()

		g := newTestConfGetter(map[string]string{
			prefix + key:          val,
			prefix + keyBoolTrue:  "YES",
			prefix + keyBoolFalse: "0",
		}, prefix)

		require.False(t, g.Bool("whatever bool"))
		require.NoError(t, g.Err())

		require.False(t, g.Bool(keyBoolFalse))
		require.NoError(t, g.Err())

		require.True(t, g.Bool(keyBoolTrue))
		require.NoError(t, g.Err())

		require.Empty(t, g.String("whatever string"))
		require.NoError(t, g.Err())

		require.Empty(t, g.String(key))
		require.Error(t, g.Err())
		require.ErrorIs(t, g.Err(), errInvalidUTF8Sequence)
	})

	t.Run("without prefix", func(t *testing.T) {
		t.Parallel()

		g := newTestConfGetter(map[string]string{
			key:          val,
			keyBoolTrue:  "true",
			keyBoolFalse: "f",
		}, "")

		require.False(t, g.Bool("whatever bool"))
		require.NoError(t, g.Err())

		require.False(t, g.Bool(keyBoolFalse))
		require.NoError(t, g.Err())

		require.True(t, g.Bool(keyBoolTrue))
		require.NoError(t, g.Err())

		require.Empty(t, g.String("whatever string"))
		require.NoError(t, g.Err())

		require.Empty(t, g.String(key))
		require.Error(t, g.Err())
		require.ErrorIs(t, g.Err(), errInvalidUTF8Sequence)
	})
}

func TestMakeDSN(t *testing.T) {
	t.Parallel()

	s, err := MakeDSN(map[string]string{
		"db_name": string(invalidUTF8ByteSequence),
	})
	require.Empty(t, s)
	require.Error(t, err)
	require.ErrorIs(t, err, errInvalidUTF8Sequence)

	s, err = MakeDSN(map[string]string{
		"skip": "",
		"user": `shou'ld esc\ape`,
		"pass": "noescape",
	})
	require.NoError(t, err)
	require.Equal(t, `pass=noescape user='shou\'ld esc\\ape'`, s)
}

func TestSplitHostPort(t *testing.T) {
	t.Parallel()

	testCases := []struct {
		hostport    string
		defaultHost string
		defaultPort string
		fails       bool

		host string
		port string
	}{
		{hostport: "192.168.0.140:456", defaultHost: "", defaultPort: "", host: "192.168.0.140", port: "456"},
		{hostport: "192.168.0.140", defaultHost: "", defaultPort: "123", host: "192.168.0.140", port: "123"},
		{hostport: "[::1]:456", defaultHost: "", defaultPort: "", host: "::1", port: "456"},
		{hostport: "[::1]", defaultHost: "", defaultPort: "123", host: "::1", port: "123"},
		{hostport: ":456", defaultHost: "1.2.3.4", defaultPort: "", host: "1.2.3.4", port: "456"},
		{hostport: "xyz.rds.amazonaws.com", defaultHost: "", defaultPort: "123", host: "xyz.rds.amazonaws.com", port: "123"},
		{hostport: "xyz.rds.amazonaws.com:123", defaultHost: "", defaultPort: "", host: "xyz.rds.amazonaws.com", port: "123"},
		{hostport: "", defaultHost: "localhost", defaultPort: "1433", host: "localhost", port: "1433"},
		{hostport: "1:1:1", fails: true},
	}

	for i, tc := range testCases {
		t.Run(fmt.Sprintf("test index #%d", i), func(t *testing.T) {
			t.Parallel()

			host, port, err := splitHostPortDefault(tc.hostport, tc.defaultHost, tc.defaultPort)
			if tc.fails {
				require.Error(t, err)
				require.Empty(t, host)
				require.Empty(t, port)
			} else {
				require.NoError(t, err)
				require.Equal(t, tc.host, host)
				require.Equal(t, tc.port, port)
			}
		})
	}
}