// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package postgres

import (
	"context"
	"fmt"
	"net/url"
	"os"
	"regexp"
	"strings"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/googleapis/genai-toolbox/internal/testutils"
	"github.com/googleapis/genai-toolbox/tests"
	"github.com/jackc/pgx/v5/pgxpool"
)

var (
	PostgresSourceKind = "postgres"
	PostgresToolKind   = "postgres-sql"
	PostgresDatabase   = os.Getenv("POSTGRES_DATABASE")
	PostgresHost       = os.Getenv("POSTGRES_HOST")
	PostgresPort       = os.Getenv("POSTGRES_PORT")
	PostgresUser       = os.Getenv("POSTGRES_USER")
	PostgresPass       = os.Getenv("POSTGRES_PASS")
)

func getPostgresVars(t *testing.T) map[string]any {
	switch "" {
	case PostgresDatabase:
		t.Fatal("'POSTGRES_DATABASE' not set")
	case PostgresHost:
		t.Fatal("'POSTGRES_HOST' not set")
	case PostgresPort:
		t.Fatal("'POSTGRES_PORT' not set")
	case PostgresUser:
		t.Fatal("'POSTGRES_USER' not set")
	case PostgresPass:
		t.Fatal("'POSTGRES_PASS' not set")
	}

	return map[string]any{
		"kind":     PostgresSourceKind,
		"host":     PostgresHost,
		"port":     PostgresPort,
		"database": PostgresDatabase,
		"user":     PostgresUser,
		"password": PostgresPass,
	}
}

// Copied over from postgres.go
func initPostgresConnectionPool(host, port, user, pass, dbname string) (*pgxpool.Pool, error) {
	// urlExample := "postgres:dd//username:password@localhost:5432/database_name"
	url := &url.URL{
		Scheme: "postgres",
		User:   url.UserPassword(user, pass),
		Host:   fmt.Sprintf("%s:%s", host, port),
		Path:   dbname,
	}
	pool, err := pgxpool.New(context.Background(), url.String())
	if err != nil {
		return nil, fmt.Errorf("Unable to create connection pool: %w", err)
	}

	return pool, nil
}

func TestPostgres(t *testing.T) {
	sourceConfig := getPostgresVars(t)
	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()

	var args []string

	pool, err := initPostgresConnectionPool(PostgresHost, PostgresPort, PostgresUser, PostgresPass, PostgresDatabase)
	if err != nil {
		t.Fatalf("unable to create postgres connection pool: %s", err)
	}

	// cleanup test environment
	tests.CleanupPostgresTables(t, ctx, pool)

	// create table name with UUID
	tableNameParam := "param_table_" + strings.ReplaceAll(uuid.New().String(), "-", "")
	tableNameAuth := "auth_table_" + strings.ReplaceAll(uuid.New().String(), "-", "")
	tableNameTemplateParam := "template_param_table_" + strings.ReplaceAll(uuid.New().String(), "-", "")

	// set up data for param tool
	createParamTableStmt, insertParamTableStmt, paramToolStmt, idParamToolStmt, nameParamToolStmt, arrayToolStmt, paramTestParams := tests.GetPostgresSQLParamToolInfo(tableNameParam)
	teardownTable1 := tests.SetupPostgresSQLTable(t, ctx, pool, createParamTableStmt, insertParamTableStmt, tableNameParam, paramTestParams)
	defer teardownTable1(t)

	// set up data for auth tool
	createAuthTableStmt, insertAuthTableStmt, authToolStmt, authTestParams := tests.GetPostgresSQLAuthToolInfo(tableNameAuth)
	teardownTable2 := tests.SetupPostgresSQLTable(t, ctx, pool, createAuthTableStmt, insertAuthTableStmt, tableNameAuth, authTestParams)
	defer teardownTable2(t)

	// Write config into a file and pass it to command
	toolsFile := tests.GetToolsConfig(sourceConfig, PostgresToolKind, paramToolStmt, idParamToolStmt, nameParamToolStmt, arrayToolStmt, authToolStmt)
	toolsFile = tests.AddExecuteSqlConfig(t, toolsFile, "postgres-execute-sql")
	tmplSelectCombined, tmplSelectFilterCombined := tests.GetPostgresSQLTmplToolStatement()
	toolsFile = tests.AddTemplateParamConfig(t, toolsFile, PostgresToolKind, tmplSelectCombined, tmplSelectFilterCombined, "")
	toolsFile = tests.AddPostgresPrebuiltConfig(t, toolsFile)

	cmd, cleanup, err := tests.StartCmd(ctx, toolsFile, args...)
	if err != nil {
		t.Fatalf("command initialization returned an error: %s", err)
	}
	defer cleanup()

	waitCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
	defer cancel()
	out, err := testutils.WaitForString(waitCtx, regexp.MustCompile(`Server ready to serve`), cmd.Out)
	if err != nil {
		t.Logf("toolbox command logs: \n%s", out)
		t.Fatalf("toolbox didn't start successfully: %s", err)
	}

	// Get configs for tests
	select1Want, mcpMyFailToolWant, createTableStatement, mcpSelect1Want := tests.GetPostgresWants()

	// Run tests
	tests.RunToolGetTest(t)
	tests.RunToolInvokeTest(t, select1Want)
	tests.RunMCPToolCallMethod(t, mcpMyFailToolWant, mcpSelect1Want)
	tests.RunExecuteSqlToolInvokeTest(t, createTableStatement, select1Want)
	tests.RunToolInvokeWithTemplateParameters(t, tableNameTemplateParam)

	// Run Postgres prebuilt tool tests
	tests.RunPostgresListTablesTest(t, tableNameParam, tableNameAuth, PostgresUser)
	tests.RunPostgresListViewsTest(t, ctx, pool, tableNameParam)
	tests.RunPostgresListSchemasTest(t, ctx, pool)
	tests.RunPostgresListActiveQueriesTest(t, ctx, pool)
	tests.RunPostgresListAvailableExtensionsTest(t)
	tests.RunPostgresListInstalledExtensionsTest(t)
}