// Package `tracking` defines a generic track (sort of record) type
// and a container type that allows storing of tracks in a SQL database.
package tracking

import (
	"encoding/json"
	"time"

	lib "git.sr.ht/~cco/go-scopes"
	"git.sr.ht/~cco/go-scopes/storage"
	sql "git.sr.ht/~cco/go-scopes/storage"
)

type Track struct {
	TrackId   uint
	Head      map[string]string
	TimeStamp *time.Time
	Data      lib.Data
	Container *container
}

type container struct {
	tableName  string
	headFields []string
	indexes    [][]string
	storage    *sql.Storage
}

func Container(db *sql.Storage) *container {
	return &container{
		tableName:  "tracks",
		headFields: []string{"taskId", "userName"},
		indexes:    [][]string{[]string{"taskId", "userName"}, []string{"userName"}},
		storage:    db,
	}
}

func Insert(cont *container, tr Track) int64 {
	var columns []string
	var values []any
	for _, k := range cont.headFields {
		columns = append(columns, k)
		values = append(values, tr.Head[k])
	}
	columns = append(columns, "Data")
	b, _ := json.Marshal(tr.Data)
	values = append(values, b)
	db := cont.storage
	data := map[string]interface{}{
		"schema":    db.Schema,
		"tablename": cont.tableName,
		"columns":   columns,
	}
	sql := storage.BuildSql(SqlInsert, data)
	if n, err := db.Exec(sql, values...); err == nil {
		return n
	}
	return 0
}

func Create(cont *container) *container {
	db := cont.storage
	data := map[string]interface{}{
		"schema":     db.Schema,
		"tablename":  cont.tableName,
		"headFields": cont.headFields,
		"indexes":    cont.indexes,
		"params":     db.Params,
	}
	sql := storage.BuildSql(SqlCreate, data)
	//println(sql)
	_, err := db.Exec(sql)
	if err == nil {
		return cont
	}
	return nil
}