package db

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"strings"

	"git.faercol.me/faercol/polyculeconnect/polyculeconnect/config"
	"git.faercol.me/faercol/polyculeconnect/polyculeconnect/internal/model"
	_ "github.com/mattn/go-sqlite3"
)

const clientRows = `"client"."id", "client"."secret", "client"."redirect_uris", "client"."trusted_peers", "client"."name"`

type ClientDB interface {
	GetClientByID(ctx context.Context, id string) (*model.Client, error)
}

type sqlClientDB struct {
	db *sql.DB
}

func strArrayToSlice(rawVal string) []string { // TODO this won't work if there's more than one element
	res := []string{}
	insideStr, ok := strings.CutPrefix(rawVal, `["`)
	if !ok {
		return res
	}
	insideStr, ok = strings.CutSuffix(insideStr, `"]`)
	if !ok {
		return res
	}

	return []string{insideStr}
}

func clientFromRow(row *sql.Row) (*model.Client, error) {
	var res model.Client
	redirectURIsStr := ""
	trustedPeersStr := ""

	if err := row.Scan(&res.ID, &res.Secret, &redirectURIsStr, &trustedPeersStr, &res.Name); err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			return nil, ErrNotFound
		}
		return nil, fmt.Errorf("invalid format for client: %w", err)
	}

	res.ClientConfig.RedirectURIs = strArrayToSlice(redirectURIsStr)
	res.ClientConfig.TrustedPeers = strArrayToSlice(trustedPeersStr)

	return &res, nil
}

func (db *sqlClientDB) GetClientByID(ctx context.Context, id string) (*model.Client, error) {
	query := fmt.Sprintf(`SELECT %s FROM "client" WHERE "id" = ?`, clientRows)
	row := db.db.QueryRowContext(ctx, query, id)
	return clientFromRow(row)
}

func New(conf config.AppConfig) (*sqlClientDB, error) {
	db, err := sql.Open("sqlite3", conf.StorageConfig.File)
	if err != nil {
		return nil, fmt.Errorf("failed to open DB: %w", err)
	}
	return &sqlClientDB{db: db}, nil
}