/**
 * useItems Hook
 * Manages item data fetching and mutations for the items management interface.
 */

import { useState, useCallback, useEffect } from "react";
import { toast } from "sonner";

// Full item type matching the database schema
export interface ItemWithUsage {
    id: number;
    name: string;
    description: string | null;
    rarity: string | null;
    type: string | null;
    price: bigint | null;
    iconUrl: string | null;
    imageUrl: string | null;
    usageData: {
        consume: boolean;
        effects: Array<{
            type: string;
            [key: string]: any;
        }>;
    } | null;
}

export interface ItemFilters {
    search?: string;
    type?: string;
    rarity?: string;
    limit?: number;
    offset?: number;
}

export interface ItemsResponse {
    items: ItemWithUsage[];
    total: number;
}

export interface CreateItemData {
    name: string;
    description?: string | null;
    rarity?: 'C' | 'R' | 'SR' | 'SSR';
    type: 'MATERIAL' | 'CONSUMABLE' | 'EQUIPMENT' | 'QUEST';
    price?: string | null;
    iconUrl?: string;
    imageUrl?: string;
    usageData?: {
        consume: boolean;
        effects: Array<{ type: string;[key: string]: any }>;
    } | null;
}

export interface UpdateItemData extends Partial<CreateItemData> { }

export function useItems(initialFilters: ItemFilters = {}) {
    const [items, setItems] = useState<ItemWithUsage[]>([]);
    const [total, setTotal] = useState(0);
    const [loading, setLoading] = useState(true);
    const [filters, setFilters] = useState<ItemFilters>(initialFilters);

    const fetchItems = useCallback(async (newFilters?: ItemFilters) => {
        setLoading(true);
        try {
            const params = new URLSearchParams();
            const activeFilters = newFilters ?? filters;

            if (activeFilters.search) params.set("search", activeFilters.search);
            if (activeFilters.type) params.set("type", activeFilters.type);
            if (activeFilters.rarity) params.set("rarity", activeFilters.rarity);
            if (activeFilters.limit) params.set("limit", String(activeFilters.limit));
            if (activeFilters.offset) params.set("offset", String(activeFilters.offset));

            const response = await fetch(`/api/items?${params.toString()}`);
            if (!response.ok) throw new Error("Failed to fetch items");

            const data: ItemsResponse = await response.json();
            setItems(data.items);
            setTotal(data.total);
        } catch (error) {
            console.error("Error fetching items:", error);
            toast.error("Failed to load items", {
                description: error instanceof Error ? error.message : "Unknown error"
            });
        } finally {
            setLoading(false);
        }
    }, [filters]);

    useEffect(() => {
        fetchItems();
    }, [fetchItems]);

    const updateFilters = useCallback((newFilters: Partial<ItemFilters>) => {
        setFilters(prev => ({ ...prev, ...newFilters }));
    }, []);

    const clearFilters = useCallback(() => {
        setFilters({});
    }, []);

    return {
        items,
        total,
        loading,
        filters,
        fetchItems,
        updateFilters,
        clearFilters,
    };
}

export function useItem(id: number | null) {
    const [item, setItem] = useState<ItemWithUsage | null>(null);
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState<string | null>(null);

    const fetchItem = useCallback(async () => {
        if (id === null) {
            setItem(null);
            return;
        }

        setLoading(true);
        setError(null);
        try {
            const response = await fetch(`/api/items/${id}`);
            if (!response.ok) {
                if (response.status === 404) {
                    throw new Error("Item not found");
                }
                throw new Error("Failed to fetch item");
            }

            const data = await response.json();
            setItem(data);
        } catch (err) {
            const message = err instanceof Error ? err.message : "Unknown error";
            setError(message);
            toast.error("Failed to load item", { description: message });
        } finally {
            setLoading(false);
        }
    }, [id]);

    useEffect(() => {
        fetchItem();
    }, [fetchItem]);

    return { item, loading, error, refetch: fetchItem };
}

export function useCreateItem() {
    const [loading, setLoading] = useState(false);

    const createItem = useCallback(async (data: CreateItemData, imageFile?: File): Promise<ItemWithUsage | null> => {
        setLoading(true);
        try {
            let response: Response;

            if (imageFile) {
                // Multipart form with image
                const formData = new FormData();
                formData.append("data", JSON.stringify(data));
                formData.append("image", imageFile);

                response = await fetch("/api/items", {
                    method: "POST",
                    body: formData,
                });
            } else {
                // JSON-only request
                response = await fetch("/api/items", {
                    method: "POST",
                    headers: { "Content-Type": "application/json" },
                    body: JSON.stringify(data),
                });
            }

            if (!response.ok) {
                const errorData = await response.json().catch(() => ({}));
                throw new Error(errorData.error || "Failed to create item");
            }

            const result = await response.json();
            toast.success("Item created", {
                description: `"${result.item.name}" has been created successfully.`
            });

            return result.item;
        } catch (err) {
            const message = err instanceof Error ? err.message : "Unknown error";
            toast.error("Failed to create item", { description: message });
            return null;
        } finally {
            setLoading(false);
        }
    }, []);

    return { createItem, loading };
}

export function useUpdateItem() {
    const [loading, setLoading] = useState(false);

    const updateItem = useCallback(async (id: number, data: UpdateItemData): Promise<ItemWithUsage | null> => {
        setLoading(true);
        try {
            const response = await fetch(`/api/items/${id}`, {
                method: "PUT",
                headers: { "Content-Type": "application/json" },
                body: JSON.stringify(data),
            });

            if (!response.ok) {
                const errorData = await response.json().catch(() => ({}));
                throw new Error(errorData.error || "Failed to update item");
            }

            const result = await response.json();
            toast.success("Item updated", {
                description: `"${result.item.name}" has been updated successfully.`
            });

            return result.item;
        } catch (err) {
            const message = err instanceof Error ? err.message : "Unknown error";
            toast.error("Failed to update item", { description: message });
            return null;
        } finally {
            setLoading(false);
        }
    }, []);

    return { updateItem, loading };
}

export function useDeleteItem() {
    const [loading, setLoading] = useState(false);

    const deleteItem = useCallback(async (id: number, name?: string): Promise<boolean> => {
        setLoading(true);
        try {
            const response = await fetch(`/api/items/${id}`, {
                method: "DELETE",
            });

            if (!response.ok) {
                const errorData = await response.json().catch(() => ({}));
                throw new Error(errorData.error || "Failed to delete item");
            }

            toast.success("Item deleted", {
                description: name ? `"${name}" has been deleted.` : "Item has been deleted."
            });

            return true;
        } catch (err) {
            const message = err instanceof Error ? err.message : "Unknown error";
            toast.error("Failed to delete item", { description: message });
            return false;
        } finally {
            setLoading(false);
        }
    }, []);

    return { deleteItem, loading };
}

export function useUploadItemIcon() {
    const [loading, setLoading] = useState(false);

    const uploadIcon = useCallback(async (itemId: number, imageFile: File): Promise<ItemWithUsage | null> => {
        setLoading(true);
        try {
            const formData = new FormData();
            formData.append("image", imageFile);

            const response = await fetch(`/api/items/${itemId}/icon`, {
                method: "POST",
                body: formData,
            });

            if (!response.ok) {
                const errorData = await response.json().catch(() => ({}));
                throw new Error(errorData.error || "Failed to upload icon");
            }

            const result = await response.json();
            toast.success("Icon uploaded", {
                description: "Item icon has been updated successfully."
            });

            return result.item;
        } catch (err) {
            const message = err instanceof Error ? err.message : "Unknown error";
            toast.error("Failed to upload icon", { description: message });
            return null;
        } finally {
            setLoading(false);
        }
    }, []);

    return { uploadIcon, loading };
}