package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"strings"

	_ "github.com/lib/pq"
)

func connectDB(config Config) (*sql.DB, error) {
	connStr := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
		config.DBHost, config.DBPort, config.DBUser, config.DBPassword, config.DBName)

	db, err := sql.Open("postgres", connStr)
	if err != nil {
		return nil, err
	}

	if err := db.Ping(); err != nil {
		return nil, err
	}

	return db, nil
}

func fetchClientsData(db *sql.DB) (map[string]ClientData, error) {
	// aliases это JSON массив в БД, конвертируем в текст через ::text
	// rps_limit берётся из client_info — NULL означает "алерт не нужен"
	// Данные всегда берутся из обеих таблиц: sp_info + manual_info (UNION)
	query := `
		SELECT DISTINCT
			COALESCE(a.client_title, 'Unknown') as client_title,
			s.sid,
			s.domain_name,
			COALESCE(s.aliases::text, 'null') as aliases,
			COALESCE(MAX(ci.rps_limit) OVER (PARTITION BY a.client_title), 0) as rps_limit,
			COALESCE(MAX(ci.rps_commercial_limit) OVER (PARTITION BY a.client_title), 100) as rps_commercial_limit,
			COALESCE(a.four_hundred, 20) as limit_4xx,
			COALESCE(a.five_hundred, 10) as limit_5xx,
			COALESCE(a.ptaf_fallback_code_alert_count, 1) as ptaf_fallback_code_alert_count,
			COALESCE(MAX(ci.waf_provider) OVER (PARTITION BY a.client_title), '') as waf_provider,
			COALESCE(MAX(ci.ptaf_fallback_code) OVER (PARTITION BY a.client_title), '') as ptaf_fallback_code
		FROM (
			SELECT sid, domain_name, aliases FROM sp_info     WHERE sid IS NOT NULL
			UNION
			SELECT sid, domain_name, aliases FROM manual_info WHERE sid IS NOT NULL
		) s
		LEFT JOIN apps_settings a ON s.sid = a.l7resourceid
		LEFT JOIN client_info ci ON a.client_title = ci.client_title
		WHERE ci.waf_provider IS NOT NULL
		ORDER BY COALESCE(a.client_title, 'Unknown'), s.sid
	`

	rows, err := db.Query(query)
	if err != nil {
		return nil, fmt.Errorf("query failed: %w", err)
	}
	defer rows.Close()

	clients := make(map[string]ClientData)

	for rows.Next() {
		var clientTitle, sid, domainName, aliasesJSON, wafProvider, ptafFallbackCode string
		var rpsLimit, rpsCommercialLimit, limit4xx, limit5xx, ptafFallbackCodeAlertCount int

		if err := rows.Scan(&clientTitle, &sid, &domainName, &aliasesJSON, &rpsLimit, &rpsCommercialLimit, &limit4xx, &limit5xx, &ptafFallbackCodeAlertCount, &wafProvider, &ptafFallbackCode); err != nil {
			return nil, fmt.Errorf("scan failed: %w", err)
		}

		// Распарсить JSON массив aliases
		aliasesStr := parseAliasesJSON(aliasesJSON)

		if _, exists := clients[clientTitle]; !exists {
			clients[clientTitle] = ClientData{
				ClientTitle:        clientTitle,
				Domains:            []DomainInfo{},
				RPSLimit:           rpsLimit,
				RPSCommercialLimit: rpsCommercialLimit,
				WafProvider:        wafProvider,
				PtafFallbackCode:   ptafFallbackCode,
			}
		}

		client := clients[clientTitle]
		client.Domains = append(client.Domains, DomainInfo{
			SID:                        sid,
			DomainName:                 domainName,
			Aliases:                    aliasesStr,
			Limit4xx:                   limit4xx,
			Limit5xx:                   limit5xx,
			PtafFallbackCodeAlertCount: ptafFallbackCodeAlertCount,
		})
		clients[clientTitle] = client
	}

	return clients, rows.Err()
}

// parseAliasesJSON конвертирует JSON массив aliases в строку
// Input: ["domain1.com", "domain2.com"] или null
// Output: "domain1.com, domain2.com" или ""
func parseAliasesJSON(jsonStr string) string {
	// Если null или пустое
	if jsonStr == "" || jsonStr == "null" {
		return ""
	}

	// Попытаться распарсить как JSON массив
	var aliases []string
	if err := json.Unmarshal([]byte(jsonStr), &aliases); err != nil {
		// Если не удалось распарсить - вернуть как есть
		log.Printf("Warning: Failed to parse aliases JSON: %s (error: %v)", jsonStr, err)
		return jsonStr
	}

	// Соединить через запятую
	return strings.Join(aliases, ", ")
}