package database_test

import (
	"context"
	"fmt"
	"os"
	"queryorchestration/internal/database"
	"testing"

	"github.com/docker/go-connections/nat"
	"github.com/stretchr/testify/assert"
	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/wait"
)

func TestDBConn(t *testing.T) {
	ctx := context.Background()
	_, container := createDB(t, ctx)
	defer container.Terminate(ctx)

	conn := database.GetDBConn(ctx)
	assert.NotNil(t, conn)

	os.Setenv("DB_HOST", "")
	assert.Panics(t, func() { database.GetDBConn(ctx) })
}

func TestDBPool(t *testing.T) {
	ctx := context.Background()
	_, container := createDB(t, ctx)
	defer container.Terminate(ctx)

	pool := database.GetDBPool(ctx)
	assert.NotNil(t, pool)

	os.Setenv("DB_HOST", "")
	assert.Panics(t, func() { database.GetDBPool(ctx) })
}

type dbConfig struct {
	Name     string
	Host     string
	Port     int
	User     string
	Password string
}

func createDB(t *testing.T, ctx context.Context) (*dbConfig, testcontainers.Container) {
	alias := "postgres"
	port, err := nat.NewPort("tcp", "5432")
	if err != nil {
		t.Fatalf("Failed to create port: %v", err)
	}

	config := dbConfig{
		Name:     "queryorchestration",
		Password: "pass",
		User:     "postgres",
		Port:     port.Int(),
		Host:     alias,
	}

	req := testcontainers.ContainerRequest{
		Image: "postgres:latest",
		Env: map[string]string{
			"POSTGRES_DB":       config.Name,
			"POSTGRES_USER":     config.User,
			"POSTGRES_PASSWORD": config.Password,
		},
		ExposedPorts: []string{port.Port()},
		WaitingFor:   wait.ForListeningPort(port),
	}

	container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
		ContainerRequest: req,
		Started:          true,
	})
	if err != nil {
		t.Fatalf("Failed to start container: %v", err)
	}

	mappedHost, err := container.Host(ctx)
	if err != nil {
		t.Fatalf("Failed to map host: %v", err)
	}

	mappedPort, err := container.MappedPort(ctx, port)
	if err != nil {
		t.Fatalf("Failed to map port: %v", err)
	}

	config.Host = mappedHost
	config.Port = mappedPort.Int()

	os.Setenv("DB_USER", config.User)
	os.Setenv("DB_PASS", config.Password)
	os.Setenv("DB_HOST", config.Host)
	os.Setenv("DB_PORT", fmt.Sprint(config.Port))
	os.Setenv("DB_NAME", config.Name)

	return &config, container
}