package core

import (
	"fmt"
	"strings"
)

func GetEnvs(db DB, source string) ([]string, error) {
	rows, err := db.Query(`
		select name, value
		from envs
		where source = ?
	`, source)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var envs []string
	for rows.Next() {
		var name string
		var value string
		if err := rows.Scan(&name, &value); err != nil {
			return nil, err
		}
		envs = append(envs, fmt.Sprintf("%s=%s", name, value))
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return envs, nil
}

func SetEnvs(db DB, source string, envs []string) error {
	return db.Transact(func(tx DB) error {
		for _, env := range envs {
			parts := strings.SplitN(env, "=", 2)
			if len(parts) != 2 {
				return fmt.Errorf("invalid env format: %s", env)
			}
			if parts[1] == "" {
				_, err := tx.Exec(`
					delete from envs
					where source = ? and name = ?
				`, source, parts[0])
				if err != nil {
					return fmt.Errorf("failed to clear source %s env %s: %v", source, parts[0], err)
				}
			} else {
				_, err := tx.Exec(`
					insert into envs (source, name, value)
					values (?, ?, ?)
				`, source, parts[0], parts[1])
				if err != nil {
					return fmt.Errorf("failed to set source %s env %s = %s: %v", source, parts[0], parts[1], err)
				}
			}
		}
		return nil
	})
}