package serviceconfig

import (
	"os"
	"strings"
	"testing"

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

// Struct specifically for initialize config testing
type initializeConfigTestStruct struct {
	BaseConfig
	AppEnv   string `env:"APP_ENV"`
	BoolTest bool   `env:"BOOL_TEST"`
	IntTest  int    `env:"INT_TEST,required,notEmpty"`
}

func TestInitializeConfig(t *testing.T) {
	tests := []struct {
		name               string
		envVars            map[string]string
		wantErr            bool
		errMessageContains string
	}{
		{
			name: "valid configuration",
			envVars: map[string]string{
				"APP_ENV":               "testing",
				"BOOL_TEST":             "true",
				"INT_TEST":              "42",
				"PGUSER":                "postgres",
				"PGPASSWORD":            "pass",
				"PGHOST":                "localhost",
				"PGPORT":                "5432",
				"PGDATABASE":            "query_orchestration",
				"DB_NOSSL":              "true",
				"AWS_ACCESS_KEY_ID":     "key",
				"AWS_SECRET_ACCESS_KEY": "secret",
				"AWS_REGION":            "region",
				"SUB_FIELD1:":           "value1",
				"SUB_FIELD2":            "42",
				"PWD":                   "/foo",
				"COGNITO_USER_POOL_ID":  "poolid",
				"COGNITO_CLIENT_SECRET": "secret",
				"COGNITO_DOMAIN":        "domain",
				"COGNITO_CLIENT_ID":     "clientid",
			},
			wantErr: false,
		},
		{
			name: "missing required env var",
			envVars: map[string]string{
				"APP_ENV":               "testing",
				"BOOL_TEST":             "true",
				"PGUSER":                "postgres",
				"PGPASSWORD":            "pass",
				"PGHOST":                "localhost",
				"PGPORT":                "5432",
				"PGDATABASE":            "query_orchestration",
				"DB_NOSSL":              "true",
				"AWS_ACCESS_KEY_ID":     "key",
				"AWS_SECRET_ACCESS_KEY": "secret",
				"AWS_REGION":            "region",
				"PWD":                   "/foo",
				// INT_TEST intentionally omitted
			},
			wantErr:            true,
			errMessageContains: "INT_TEST",
		},
		{
			name: "invalid boolean value",
			envVars: map[string]string{
				"APP_ENV":   "testing",
				"BOOL_TEST": "notabool",
				"PWD":       "/foo",
				"INT_TEST":  "42",
			},
			wantErr:            true,
			errMessageContains: "BoolTest",
		},
		{
			name: "invalid integer value",
			envVars: map[string]string{
				"APP_ENV":   "testing",
				"BOOL_TEST": "true",
				"PWD":       "/foo",
				"INT_TEST":  "notanint",
			},
			wantErr:            true,
			errMessageContains: "parse error on field \"IntTest\"",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Clear environment at the start of each subtest
			os.Clearenv()

			// Set environment variables for this test case
			for k, v := range tt.envVars {
				t.Setenv(k, v)
			}

			// Use the test-specific config struct
			cfg := &initializeConfigTestStruct{}
			err := initializeConfigPrivate(cfg)

			logger := cfg.GetLogger()
			assert.NotNil(t, logger)
			logger.Info("Logger initialized")

			if tt.wantErr {
				if err == nil {
					t.Errorf("InitializeConfig() error = nil, wantErr %v", tt.wantErr)
					return
				}
				// Check error message contains expected string
				if tt.errMessageContains != "" && !strings.Contains(err.Error(), tt.errMessageContains) {
					t.Errorf("InitializeConfig() error = %v, want error containing %v", err, tt.errMessageContains)
				}
			} else {
				if err != nil {
					t.Errorf("InitializeConfig() unexpected error = %v", err)
					return
				}

				// Verify the values were set correctly
				if cfg.AppEnv != tt.envVars["APP_ENV"] {
					t.Errorf("AppEnv = %v, want %v", cfg.AppEnv, tt.envVars["APP_ENV"])
				}
				if cfg.BoolTest != (tt.envVars["BOOL_TEST"] == "true") {
					t.Errorf("BoolTest = %v, want %v", cfg.BoolTest, tt.envVars["BOOL_TEST"] == "true")
				}
				expectedInt := 42 // Known value from test cases
				if cfg.IntTest != expectedInt {
					t.Errorf("IntTest = %v, want %v", cfg.IntTest, expectedInt)
				}
			}
		})
	}
	os.Clearenv()

}

func TestGetBaseConfig(t *testing.T) {
	assert.NotNil(t, getBaseConfig(&BaseConfig{}))
	assert.Nil(t, getBaseConfig(nil))
	assert.NotNil(t, getBaseConfig(&initializeConfigTestStruct{}))
	os.Clearenv()
}