package admin

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"ds2api/internal/config"
)

func reverseAccounts(a []config.Account) {
	for i, j := 0, len(a)-1; i < j; i, j = i+1, j-1 {
		a[i], a[j] = a[j], a[i]
	}
}

func intFromQuery(r *http.Request, key string, d int) int {
	v := r.URL.Query().Get(key)
	if v == "" {
		return d
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return d
	}
	return n
}

func intFrom(v any) int {
	switch n := v.(type) {
	case float64:
		return int(n)
	case int:
		return n
	case int64:
		return int(n)
	default:
		return 0
	}
}

func nilIfEmpty(s string) any {
	if s == "" {
		return nil
	}
	return s
}

func nilIfZero(v int64) any {
	if v == 0 {
		return nil
	}
	return v
}

func toStringSlice(v any) ([]string, bool) {
	arr, ok := v.([]any)
	if !ok {
		return nil, false
	}
	out := make([]string, 0, len(arr))
	for _, item := range arr {
		out = append(out, strings.TrimSpace(fmt.Sprintf("%v", item)))
	}
	return out, true
}

func toAccount(m map[string]any) config.Account {
	return config.Account{
		Email:    fieldString(m, "email"),
		Mobile:   fieldString(m, "mobile"),
		Password: fieldString(m, "password"),
		Token:    fieldString(m, "token"),
	}
}

func fieldString(m map[string]any, key string) string {
	v, ok := m[key]
	if !ok || v == nil {
		return ""
	}
	return strings.TrimSpace(fmt.Sprintf("%v", v))
}

func statusOr(v int, d int) int {
	if v == 0 {
		return d
	}
	return v
}

func writeJSON(w http.ResponseWriter, status int, payload any) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(payload)
}