package global

import (
	"context"
	"fmt"
	"time"

	"electricity_bill_calc/config"
	"electricity_bill_calc/logger"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgconn"
	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/samber/lo"
	"go.uber.org/zap"
)

var (
	DB *pgxpool.Pool
)

func SetupDatabaseConnection() error {
	connConfig := &pgx.ConnConfig{
		Config: pgconn.Config{
			Host:           config.DatabaseSettings.Host,
			Port:           uint16(config.DatabaseSettings.Port),
			User:           config.DatabaseSettings.User,
			Password:       config.DatabaseSettings.Pass,
			Database:       config.DatabaseSettings.DB,
			TLSConfig:      nil,
			ConnectTimeout: 0 * time.Second,
			RuntimeParams:  map[string]string{"application_name": "elec_service_go"},
		},
		Tracer: QueryLogger{
			logger: logger.Named("PG"),
		},
	}
	poolConfig := &pgxpool.Config{
		ConnConfig:        connConfig,
		MaxConnLifetime:   60 * time.Minute,
		MaxConnIdleTime:   10 * time.Minute,
		HealthCheckPeriod: 10 * time.Second,
		MaxConns:          int32(config.DatabaseSettings.MaxOpenConns),
		MinConns:          int32(config.DatabaseSettings.MaxIdleConns),
	}
	DB, _ = pgxpool.NewWithConfig(context.Background(), poolConfig)

	return nil
}

type QueryLogger struct {
	logger *zap.Logger
}

func (ql QueryLogger) TraceQueryStart(ctx context.Context, conn *pgx.Conn, data pgx.TraceQueryStartData) context.Context {
	ql.logger.Info(fmt.Sprintf("将要执行查询: %s", data.SQL))
	ql.logger.Info("查询参数", lo.Map(data.Args, func(elem any, index int) zap.Field {
		return zap.Any(fmt.Sprintf("[Arg %d]: ", index), elem)
	})...)
	return ctx
}

func (ql QueryLogger) TraceQueryEnd(ctx context.Context, conn *pgx.Conn, data pgx.TraceQueryEndData) {
	var logFunc func(string, ...zap.Field)
	var templateString string
	if data.Err != nil {
		logFunc = ql.logger.Error
		templateString = "命令 [%s] 执行失败。"
	} else {
		logFunc = ql.logger.Info
		templateString = "命令 [%s] 执行成功。"
	}
	switch {
	case data.CommandTag.Update():
		fallthrough
	case data.CommandTag.Delete():
		fallthrough
	case data.CommandTag.Insert():
		logFunc(
			fmt.Sprintf(templateString, data.CommandTag.String()),
			zap.Error(data.Err),
			zap.Any("affected", data.CommandTag.RowsAffected()))
	case data.CommandTag.Select():
		logFunc(
			fmt.Sprintf(templateString, data.CommandTag.String()),
			zap.Error(data.Err))
	default:
		logFunc(
			fmt.Sprintf(templateString, data.CommandTag.String()),
			zap.Error(data.Err))
	}
}