package model

import (
	"fmt"
	"strconv"
	"strings"
)

type PoolCategory string
type PoolOrder string
type PoolIDs []int64

const (
	Series     PoolCategory = "series"
	Collection PoolCategory = "collection"
)

const (
	PoolName  PoolOrder = "name"
	CreatedAt PoolOrder = "created_at"
	UpdatedAt PoolOrder = "updated_at"
	PostCount PoolOrder = "post_count"
)

type Pool struct {
	ID          int64        `json:"id" csv:"id"`
	Name        string       `json:"name" csv:"name"`
	CreatedAt   string       `json:"created_at" csv:"created_at"`
	UpdatedAt   string       `json:"updated_at" csv:"updated_at"`
	CreatorID   int64        `json:"creator_id" csv:"creator_id"`
	Description string       `json:"description" csv:"description"`
	IsActive    bool         `json:"is_active" csv:"is_active"`
	Category    PoolCategory `json:"category" csv:"category"`
	PostIDS     PoolIDs      `json:"post_ids" csv:"post_ids"`
	CreatorName string       `json:"creator_name" csv:"-"`
	PostCount   int64        `json:"post_count" csv:"-"`
}

// UnmarshalCSV parses a CSV-formatted string containing pool IDs and populates the PoolIDs receiver.
//
// This method is designed to unmarshal a CSV-formatted string, where pool IDs are separated by commas.
// It trims the surrounding curly braces and splits the string to extract individual pool IDs.
// The parsed IDs are then converted to int64 and assigned to the PoolIDs receiver.
//
// Parameters:
//   - csv: The CSV-formatted string containing pool IDs.
//
// Returns:
//   - error: An error encountered during the unmarshaling process, if any.
func (poolIDs *PoolIDs) UnmarshalCSV(csv string) error {
	// Trim the surrounding curly braces
	csv = strings.TrimPrefix(csv, "{")
	csv = strings.TrimSuffix(csv, "}")

	// Split the CSV string into individual pool IDs
	ids := strings.Split(csv, ",")

	var localPoolIDs PoolIDs

	// Iterate through each ID, parse it to int64, and append to the localPoolIDs
	for _, id := range ids {
		if id != "" {
			int64ID, err := strconv.ParseInt(id, 10, 64)
			if err != nil {
				return fmt.Errorf("failed to parse pool ID '%s': %v", id, err)
			}
			localPoolIDs = append(localPoolIDs, int64ID)
		}
	}

	// Assign the parsed IDs to the receiver
	*poolIDs = localPoolIDs
	return nil
}