package config

import (
	"os"
	"strings"
	"testing"

	"github.com/spf13/viper"
	"github.com/stretchr/testify/assert"
)

var stringEnvConfigYaml = `
pageTitle: ${{ INPUT }}
`

var stringEnvInterpolationConfigYaml = `
pageTitle: Olivetin - ${{ INPUT }}
`

var boolEnvConfigYaml = `
checkForUpdates: ${{ INPUT }}
`

var numericEnvConfigYaml = `
logHistoryPageSize: ${{ INPUT }}
`

var argsSyntaxConfigYaml = `
actions:
  - title: Ping host
    id: ping_host
    shell: ping {{ host }} -c ${{ INPUT }}
    icon: ping
    timeout: 100
    popupOnStart: execution-dialog-stdout-only
    arguments:
      - name: host
        title: Host
        type: ascii_identifier
        default: example.com
        description: The host that you want to ping
`

func pageTitleSelector(cfg *Config) any {
	return cfg.PageTitle
}

func checkForUpdatesSelector(cfg *Config) any {
	return cfg.CheckForUpdates
}

func logHistoryPageSizeSelector(cfg *Config) any {
	return cfg.LogHistoryPageSize
}

var envConfigTests = []struct {
	yaml     string
	input    string
	output   any
	selector func(*Config) any
}{
	// Test that it works for string type config fields, both standalone and as part of a larger string value.
	{stringEnvConfigYaml, "A Nice Title", "A Nice Title", pageTitleSelector},
	{stringEnvInterpolationConfigYaml, "A Nice Title", "Olivetin - A Nice Title", pageTitleSelector},
	// Test that unset variables turn into empty strings.
	{stringEnvConfigYaml, "", "", pageTitleSelector},
	// Test that it works for bool type config fields for intuitive bool->string conversions.
	{boolEnvConfigYaml, "FALSE", false, checkForUpdatesSelector},
	{boolEnvConfigYaml, "false", false, checkForUpdatesSelector},
	{boolEnvConfigYaml, "False", false, checkForUpdatesSelector},
	{boolEnvConfigYaml, "TRUE", true, checkForUpdatesSelector},
	{boolEnvConfigYaml, "true", true, checkForUpdatesSelector},
	{boolEnvConfigYaml, "True", true, checkForUpdatesSelector},
	{boolEnvConfigYaml, "0", false, checkForUpdatesSelector},
	{boolEnvConfigYaml, "1", true, checkForUpdatesSelector},
	// Test that unset variables turn into false bools.
	{boolEnvConfigYaml, "", false, checkForUpdatesSelector},
	// Test that it works for numeric type config fields.
	{numericEnvConfigYaml, "2048", int64(2048), logHistoryPageSizeSelector},
	// Test that unset variables turn into zero numbers.
	{numericEnvConfigYaml, "", int64(0), logHistoryPageSizeSelector},
	// Test that it doesn't interfere with similar arguments
	{argsSyntaxConfigYaml, "5", "ping {{ host }} -c 5", func(cfg *Config) any { return cfg.Actions[0].Shell }},
}

func TestEnvInConfig(t *testing.T) {
	viper.SetConfigType("yaml")

	for _, tt := range envConfigTests {
		err := viper.ReadConfig(strings.NewReader(tt.yaml))
		assert.Nil(t, err, "Viper read config file with environment variable syntax")

		if tt.input != "" {
			os.Setenv("INPUT", tt.input)
		}

		cfg := DefaultConfig()
		Reload(cfg)
		field := tt.selector(cfg)
		assert.Equal(t, tt.output, field, "Unmarshaled config field doesn't match expected value: env=\"%s\"", tt.input)

		os.Unsetenv("INPUT")
	}
}