package mysql

import (
	"context"
	"strings"

	"github.com/pkg/errors"
	"google.golang.org/protobuf/encoding/protojson"

	storepb "github.com/usememos/memos/proto/gen/store"
	"github.com/usememos/memos/store"
)

func (d *DB) CreateActivity(ctx context.Context, create *store.Activity) (*store.Activity, error) {
	payloadString := "{}"
	if create.Payload != nil {
		bytes, err := protojson.Marshal(create.Payload)
		if err != nil {
			return nil, errors.Wrap(err, "failed to marshal activity payload")
		}
		payloadString = string(bytes)
	}
	fields := []string{"`creator_id`", "`type`", "`level`", "`payload`"}
	placeholder := []string{"?", "?", "?", "?"}
	args := []any{create.CreatorID, create.Type.String(), create.Level.String(), payloadString}

	if create.ID != 0 {
		fields = append(fields, "`id`")
		placeholder = append(placeholder, "?")
		args = append(args, create.ID)
	}

	if create.CreatedTs != 0 {
		fields = append(fields, "`created_ts`")
		placeholder = append(placeholder, "FROM_UNIXTIME(?)")
		args = append(args, create.CreatedTs)
	}

	stmt := "INSERT INTO activity (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ")"
	result, err := d.db.ExecContext(ctx, stmt, args...)
	if err != nil {
		return nil, errors.Wrap(err, "failed to execute statement")
	}

	id, err := result.LastInsertId()
	if err != nil {
		return nil, errors.Wrap(err, "failed to get last insert id")
	}

	id32 := int32(id)

	list, err := d.ListActivities(ctx, &store.FindActivity{ID: &id32})
	if err != nil || len(list) == 0 {
		return nil, errors.Wrap(err, "failed to find activity")
	}

	return list[0], nil
}

func (d *DB) ListActivities(ctx context.Context, find *store.FindActivity) ([]*store.Activity, error) {
	where, args := []string{"1 = 1"}, []any{}

	if find.ID != nil {
		where, args = append(where, "`id` = ?"), append(args, *find.ID)
	}
	if find.Type != nil {
		where, args = append(where, "`type` = ?"), append(args, find.Type.String())
	}

	query := "SELECT `id`, `creator_id`, `type`, `level`, `payload`, UNIX_TIMESTAMP(`created_ts`) FROM `activity` WHERE " + strings.Join(where, " AND ") + " ORDER BY `created_ts` DESC"
	rows, err := d.db.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	list := []*store.Activity{}
	for rows.Next() {
		activity := &store.Activity{}
		var payloadBytes []byte
		if err := rows.Scan(
			&activity.ID,
			&activity.CreatorID,
			&activity.Type,
			&activity.Level,
			&payloadBytes,
			&activity.CreatedTs,
		); err != nil {
			return nil, err
		}

		payload := &storepb.ActivityPayload{}
		if err := protojsonUnmarshaler.Unmarshal(payloadBytes, payload); err != nil {
			return nil, err
		}
		activity.Payload = payload
		list = append(list, activity)
	}

	if err := rows.Err(); err != nil {
		return nil, err
	}

	return list, nil
}