package v1

import (
	"context"
	"log/slog"

	remotev1 "code.icb4dc0.de/buildr/api/generated/remote/v1"
)

var _ slog.Handler = (*GrpcExecutorHandler)(nil)

func NewGrpcExecutorHandler(sender StreamSender[*remotev1.ExecutionServerMessage]) *GrpcExecutorHandler {
	return &GrpcExecutorHandler{
		Level:  slog.LevelDebug,
		sender: sender,
	}
}

type GrpcExecutorHandler struct {
	sender     StreamSender[*remotev1.ExecutionServerMessage]
	group      string
	attributes []slog.Attr
	Level      slog.Level
}

func (g GrpcExecutorHandler) Enabled(_ context.Context, level slog.Level) bool {
	return g.Level <= level
}

//nolint:gocritic // can't pass by reference due to interface constraints
func (g GrpcExecutorHandler) Handle(_ context.Context, record slog.Record) error {
	taskLog := remotev1.TaskLog{
		Time:       record.Time.UnixMicro(),
		Message:    record.Message,
		Level:      int32(record.Level),
		Attributes: make([]*remotev1.TaskLog_LogAttribute, 0, record.NumAttrs()),
	}

	record.Attrs(func(attr slog.Attr) bool {
		taskLog.Attributes = append(taskLog.Attributes, &remotev1.TaskLog_LogAttribute{
			Key:   attr.Key,
			Value: attr.Value.String(),
		})

		return true
	})

	resp := remotev1.ExecutionServerMessage{
		Envelope: &remotev1.ExecutionServerMessage_TaskLog{
			TaskLog: &taskLog,
		},
	}

	return g.sender.Send(&resp)
}

func (g GrpcExecutorHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
	all := make([]slog.Attr, len(g.attributes)+len(attrs))
	copy(all, g.attributes)
	copy(all[len(g.attributes):], attrs)

	return GrpcExecutorHandler{
		sender:     g.sender,
		Level:      g.Level,
		group:      g.group,
		attributes: all,
	}
}

func (g GrpcExecutorHandler) WithGroup(name string) slog.Handler {
	g.group = name
	return g
}