package booking

import (
	"fmt"
	"strings"

	"github.com/rjNemo/rentease/internal/config"
)

func (bs Service) ParseFromAPI(rawContent string) (*Booking, error) {
	b, err := bs.parser.Parse(rawContent)
	if err != nil {
		return nil, err
	}

	items := b.Items
	b = bs.Create(b.From, b.To, b.Name, b.PhoneNumber, b.Email, string(b.Platform), b.CustomerNumber, b.PlatformFees, b.ExternalID)

	hostItems := config.NewHost().Items
	createdItems := make([]Item, 0, len(items))
	for _, itm := range items {
		itemName := strings.TrimSpace(itm.Item)
		hostItem, ok := findHostItem(hostItems, itemName)
		if ok {
			for _, created := range bs.CreateItem(b.ID, hostItem, itm.Quantity, itm.Price, itm.PaymentMethod, b.CustomerNumber, string(b.Platform)) {
				createdItems = append(createdItems, *created)
			}
			continue
		}

		fallbackItem := &Item{
			BookingID:     b.ID,
			Item:          itemName,
			Quantity:      itm.Quantity,
			Price:         itm.Price,
			PaymentMethod: itm.PaymentMethod,
			PaymentStatus: "Pending",
		}

		if err := bs.store.CreateItem(fallbackItem); err != nil {
			return nil, fmt.Errorf("failed to create item %q for booking %d: %w", itemName, b.ID, err)
		}
		createdItems = append(createdItems, *fallbackItem)
	}

	b.Items = createdItems

	return b, nil
}

func findHostItem(hostItems map[string]config.HostItem, itemName string) (config.HostItem, bool) {
	if itemName == "" {
		return config.HostItem{}, false
	}

	// Exact match on key
	if hostItem, ok := hostItems[itemName]; ok {
		return hostItem, true
	}

	// Case-insensitive match on key
	for key, hostItem := range hostItems {
		if strings.EqualFold(key, itemName) {
			return hostItem, true
		}
	}

	// Token match (handles verbose names containing the configured item, e.g., "One-Bedroom House (T2 - ...)")
	tokens := tokenizeItemName(itemName)
	for key, hostItem := range hostItems {
		lKey := strings.ToLower(key)
		if tokens[lKey] || tokens[strings.ToLower(hostItem.Name)] {
			return hostItem, true
		}
	}

	// Substring match as last resort (avoids dropping partially matching items)
	lower := strings.ToLower(itemName)
	for key, hostItem := range hostItems {
		lKey := strings.ToLower(key)
		lName := strings.ToLower(hostItem.Name)
		if strings.Contains(lower, lKey) || strings.Contains(lower, lName) {
			return hostItem, true
		}
	}

	return config.HostItem{}, false
}

func tokenizeItemName(itemName string) map[string]bool {
	tokens := strings.FieldsFunc(itemName, func(r rune) bool {
		return r == ' ' || r == '-' || r == '_' || r == '(' || r == ')' || r == ',' || r == '/' || r == '.'
	})

	result := make(map[string]bool, len(tokens))
	for _, t := range tokens {
		if t == "" {
			continue
		}
		result[strings.ToLower(t)] = true
	}

	return result
}