// 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"
	"os"
	"regexp"
	"strings"
	"testing"
	"time"

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

var (
	POSTGRES_SOURCE_KIND = "postgres"
	POSTGRES_TOOL_KIND   = "postgres-sql"
	POSTGRES_DATABASE    = os.Getenv("POSTGRES_DATABASE")
	POSTGRES_HOST        = os.Getenv("POSTGRES_HOST")
	POSTGRES_PORT        = os.Getenv("POSTGRES_PORT")
	POSTGRES_USER        = os.Getenv("POSTGRES_USER")
	POSTGRES_PASS        = os.Getenv("POSTGRES_PASS")
)

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

	return map[string]any{
		"kind":     POSTGRES_SOURCE_KIND,
		"host":     POSTGRES_HOST,
		"port":     POSTGRES_PORT,
		"database": POSTGRES_DATABASE,
		"user":     POSTGRES_USER,
		"password": POSTGRES_PASS,
	}
}

// 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"
	i := fmt.Sprintf("postgres://%s:%s@%s:%s/%s", user, pass, host, port, dbname)
	pool, err := pgxpool.New(context.Background(), i)
	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(POSTGRES_HOST, POSTGRES_PORT, POSTGRES_USER, POSTGRES_PASS, POSTGRES_DATABASE)
	if err != nil {
		t.Fatalf("unable to create postgres connection pool: %s", err)
	}

	// 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
	create_statement1, insert_statement1, tool_statement1, params1 := tests.GetPostgresSQLParamToolInfo(tableNameParam)
	teardownTable1 := tests.SetupPostgresSQLTable(t, ctx, pool, create_statement1, insert_statement1, tableNameParam, params1)
	defer teardownTable1(t)

	// set up data for auth tool
	create_statement2, insert_statement2, tool_statement2, params2 := tests.GetPostgresSQLAuthToolInfo(tableNameAuth)
	teardownTable2 := tests.SetupPostgresSQLTable(t, ctx, pool, create_statement2, insert_statement2, tableNameAuth, params2)
	defer teardownTable2(t)

	// Write config into a file and pass it to command
	toolsFile := tests.GetToolsConfig(sourceConfig, POSTGRES_TOOL_KIND, tool_statement1, tool_statement2)
	toolsFile = tests.AddPgExecuteSqlConfig(t, toolsFile)
	tmplSelectCombined, tmplSelectFilterCombined := tests.GetPostgresSQLTmplToolStatement()
	toolsFile = tests.AddTemplateParamConfig(t, toolsFile, POSTGRES_TOOL_KIND, tmplSelectCombined, tmplSelectFilterCombined)

	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 := cmd.WaitForString(waitCtx, regexp.MustCompile(`Server ready to serve`))
	if err != nil {
		t.Logf("toolbox command logs: \n%s", out)
		t.Fatalf("toolbox didn't start successfully: %s", err)
	}

	tests.RunToolGetTest(t)

	select1Want, failInvocationWant, createTableStatement := tests.GetPostgresWants()
	invokeParamWant, mcpInvokeParamWant := tests.GetNonSpannerInvokeParamWant()
	tests.RunToolInvokeTest(t, select1Want, invokeParamWant)
	tests.RunExecuteSqlToolInvokeTest(t, createTableStatement, select1Want)
	tests.RunMCPToolCallMethod(t, mcpInvokeParamWant, failInvocationWant)
	tests.RunToolInvokeWithTemplateParameters(t, tableNameTemplateParam)
}