package database

import (
	"database/sql"
	"fmt"
	_ "github.com/mattn/go-sqlite3"
	"log"
	"strings"
	"time"
)

type DomainOwner struct {
	UserID    string    `json:"user_id"`
	Domain    string    `json:"domain"`
	CreatedAt time.Time `json:"created_at"`
}

type DNSRecord struct {
	ID        string    `json:"id"`
	UserID    string    `json:"user_id"`
	Name      string    `json:"name"`
	Type      string    `json:"type"`
	Content   string    `json:"content"`
	TTL       int       `json:"ttl"`
	Internal  bool      `json:"internal"`
	CreatedAt time.Time `json:"created_at"`
}

func CountUserDNSRecords(db *sql.DB, userID string) (int, error) {
	log.Println("counting dns records for user", userID)

	row := db.QueryRow("SELECT COUNT(*) FROM dns_records WHERE user_id = ?", userID)
	var count int
	err := row.Scan(&count)
	if err != nil {
		return 0, err
	}
	return count, nil
}

func GetUserDNSRecords(db *sql.DB, userID string) ([]DNSRecord, error) {
	log.Println("getting dns records for user", userID)

	rows, err := db.Query("SELECT * FROM dns_records WHERE user_id = ?", userID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var records []DNSRecord
	for rows.Next() {
		var record DNSRecord
		err := rows.Scan(&record.ID, &record.UserID, &record.Name, &record.Type, &record.Content, &record.TTL, &record.Internal, &record.CreatedAt)
		if err != nil {
			return nil, err
		}
		records = append(records, record)
	}

	return records, nil
}

func SaveDNSRecord(db *sql.DB, record *DNSRecord) (*DNSRecord, error) {
	log.Println("saving dns record", record.ID)

	if (record.CreatedAt == time.Time{}) {
		record.CreatedAt = time.Now()
	}

	_, err := db.Exec("INSERT OR REPLACE INTO dns_records (id, user_id, name, type, content, ttl, internal, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)", record.ID, record.UserID, record.Name, record.Type, record.Content, record.TTL, record.Internal, record.CreatedAt)

	if err != nil {
		return nil, err
	}
	return record, nil
}

func GetDNSRecord(db *sql.DB, recordID string) (*DNSRecord, error) {
	log.Println("getting dns record", recordID)

	row := db.QueryRow("SELECT * FROM dns_records WHERE id = ?", recordID)
	var record DNSRecord
	err := row.Scan(&record.ID, &record.UserID, &record.Name, &record.Type, &record.Content, &record.TTL, &record.Internal, &record.CreatedAt)
	if err != nil {
		return nil, err
	}
	return &record, nil
}

func DeleteDNSRecord(db *sql.DB, recordID string) error {
	log.Println("deleting dns record", recordID)

	_, err := db.Exec("DELETE FROM dns_records WHERE id = ?", recordID)
	if err != nil {
		return err
	}
	return nil
}

func FindFirstDomainOwnerId(db *sql.DB, domain string) (string, error) {
	log.Println("finding domain owner for", domain)

	ownerID := ""
	parts := strings.Split(domain, ".")
	if len(parts) < 2 {
		return ownerID, fmt.Errorf("invalid domain; must have at least two parts")
	}

	for ownerID == "" {
		row := db.QueryRow("SELECT user_id FROM domain_owners WHERE domain = ?", strings.Join(parts, "."))
		err := row.Scan(&ownerID)

		if err != nil {
			if len(parts) == 1 {
				break
			}
			parts = parts[1:]
		}
	}

	if ownerID == "" {
		return ownerID, fmt.Errorf("no owner found for domain")
	}
	return ownerID, nil
}

func FindDNSRecords(dbConn *sql.DB, name string, qtype string) ([]DNSRecord, error) {
	log.Println("finding dns record(s) for", name, qtype)

	rows, err := dbConn.Query("SELECT * FROM dns_records WHERE name = ? AND type = ?", name, qtype)
	if err != nil {
		return nil, err
	}

	defer rows.Close()

	var records []DNSRecord
	for rows.Next() {
		var record DNSRecord
		err := rows.Scan(&record.ID, &record.UserID, &record.Name, &record.Type, &record.Content, &record.TTL, &record.Internal, &record.CreatedAt)
		if err != nil {
			return nil, err
		}
		records = append(records, record)
	}

	return records, nil
}

func SaveDomainOwner(db *sql.DB, domainOwner *DomainOwner) (*DomainOwner, error) {
	log.Println("saving domain owner", domainOwner.Domain)

	domainOwner.CreatedAt = time.Now()
	_, err := db.Exec("INSERT OR REPLACE INTO domain_owners (user_id, domain, created_at) VALUES (?, ?, ?)", domainOwner.UserID, domainOwner.Domain, domainOwner.CreatedAt)

	if err != nil {
		return nil, err
	}
	return domainOwner, nil
}