package database

import (
	"context"
	"errors"
	"fmt"
	"time"

	gormlogger "gorm.io/gorm/logger"
	"qoobing.com/gomod/log"
)

// ErrRecordNotFound record not found error
var ErrRecordNotFound = errors.New("record not found")

// Colors
const (
	Reset       = "\033[0m"
	Red         = "\033[31m"
	Green       = "\033[32m"
	Yellow      = "\033[33m"
	Blue        = "\033[34m"
	Magenta     = "\033[35m"
	Cyan        = "\033[36m"
	White       = "\033[37m"
	BlueBold    = "\033[34;1m"
	MagentaBold = "\033[35;1m"
	RedBold     = "\033[31;1m"
	YellowBold  = "\033[33;1m"
)

// LogLevel log level
type LogLevel = gormlogger.LogLevel

const (
	// Silent silent log level
	Silent LogLevel = iota + 1
	// Error error log level
	Error
	// Warn warn log level
	Warn
	// Info info log level
	Info
)

// LogConfig logger config
type LogConfig struct {
	SlowThreshold             time.Duration
	Colorful                  bool
	IgnoreRecordNotFoundError bool
	ParameterizedQueries      bool
	LogLevel                  LogLevel
}

var (
	// // Discard logger will print any log to io.Discard
	// Discard = New(log.New(io.Discard, "", log.LstdFlags), Config{})
	// // defaultLogger defaultLogger logger
	//
	defaultLogger = New(LogConfig{
		SlowThreshold:             200 * time.Millisecond,
		LogLevel:                  Info,
		IgnoreRecordNotFoundError: false,
		Colorful:                  true,
	})

	// defautRecorder logger records running SQL into a recorder instance
	defautRecorder = traceRecorder{Interface: defaultLogger, BeginAt: time.Now()}
)

// New initialize logger
func New(config LogConfig) gormlogger.Interface {
	var (
		infoStr      = "%s\n[info] "
		warnStr      = "%s\n[warn] "
		errStr       = "%s\n[error] "
		traceStr     = "%s\n[%.3fms] [rows:%v] %s"
		traceWarnStr = "%s\n[%.3fms] [rows:%v] %s"
		traceErrStr  = "%s\n[%.3fms] [rows:%v] %s"
	)

	if config.Colorful {
		infoStr = Green + "%s\n" + Reset + Green + "[info] " + Reset
		warnStr = BlueBold + "%s\n" + Reset + Magenta + "[warn] " + Reset
		errStr = Magenta + "%s\n" + Reset + Red + "[error] " + Reset
		traceStr = Yellow + "[%.3fms] " + BlueBold + "[rows:%v]" + Reset + " %s"
		traceWarnStr = Yellow + "%s\n" + Reset + RedBold + "[%.3fms] " + Yellow + "[rows:%v]" + Magenta + " %s" + Reset
		traceErrStr = MagentaBold + "%s\n" + Reset + Yellow + "[%.3fms] " + BlueBold + "[rows:%v]" + Reset + " %s"
	}
	baseLogger := *log.New("gorm")
	baseLogger.SetCalldepth(3)
	return &logger{
		baseLogger:   baseLogger,
		LogConfig:    config,
		infoStr:      infoStr,
		warnStr:      warnStr,
		errStr:       errStr,
		traceStr:     traceStr,
		traceWarnStr: traceWarnStr,
		traceErrStr:  traceErrStr,
	}
}

type logger struct {
	LogConfig
	baseLogger                          log.Logger
	infoStr, warnStr, errStr            string
	traceStr, traceErrStr, traceWarnStr string
}

// LogMode log mode
func (l *logger) LogMode(level LogLevel) gormlogger.Interface {
	newlogger := *l
	newlogger.LogLevel = level
	return &newlogger
}

// Info print info
func (l *logger) Info(ctx context.Context, msg string, data ...interface{}) {
	if l.LogLevel >= Info {
		l.baseLogger.Infof(l.infoStr+msg, data)
	}
}

// Warn print warn messages
func (l *logger) Warn(ctx context.Context, msg string, data ...interface{}) {
	if l.LogLevel >= Warn {
		l.baseLogger.Warningf(l.warnStr+msg, data)
	}
}

// Error print error messages
func (l *logger) Error(ctx context.Context, msg string, data ...interface{}) {
	if l.LogLevel >= Error {
		l.baseLogger.Errorf(l.errStr+msg, data)
	}
}

// Trace print sql message
//
//nolint:cyclop
func (l *logger) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
	if l.LogLevel <= Silent {
		return
	}

	elapsed := time.Since(begin)
	switch {
	case err != nil && l.LogLevel >= Error && (!errors.Is(err, ErrRecordNotFound) || !l.IgnoreRecordNotFoundError):
		sql, rows := fc()
		if rows == -1 {
			l.baseLogger.Debugf(l.traceErrStr, err, float64(elapsed.Nanoseconds())/1e6, "-", sql)
		} else {
			l.baseLogger.Debugf(l.traceErrStr, err, float64(elapsed.Nanoseconds())/1e6, rows, sql)
		}
	case elapsed > l.SlowThreshold && l.SlowThreshold != 0 && l.LogLevel >= Warn:
		sql, rows := fc()
		slowLog := fmt.Sprintf("SLOW SQL >= %v", l.SlowThreshold)
		if rows == -1 {
			l.baseLogger.Debugf(l.traceWarnStr, slowLog, float64(elapsed.Nanoseconds())/1e6, "-", sql)
		} else {
			l.baseLogger.Debugf(l.traceWarnStr, slowLog, float64(elapsed.Nanoseconds())/1e6, rows, sql)
		}
	case l.LogLevel == Info:
		sql, rows := fc()
		if rows == -1 {
			l.baseLogger.Debugf(l.traceStr, float64(elapsed.Nanoseconds())/1e6, "-", sql)
		} else {
			l.baseLogger.Debugf(l.traceStr, float64(elapsed.Nanoseconds())/1e6, rows, sql)
		}
	}
}

// ParamsFilter filter params
func (l *logger) ParamsFilter(ctx context.Context, sql string, params ...interface{}) (string, []interface{}) {
	if l.LogConfig.ParameterizedQueries {
		return sql, nil
	}
	return sql, params
}

type traceRecorder struct {
	gormlogger.Interface
	BeginAt      time.Time
	SQL          string
	RowsAffected int64
	Err          error
}

// New trace recorder
func (l *traceRecorder) New() *traceRecorder {
	return &traceRecorder{Interface: l.Interface, BeginAt: time.Now()}
}

// Trace implement logger interface
func (l *traceRecorder) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
	l.BeginAt = begin
	l.SQL, l.RowsAffected = fc()
	l.Err = err
}