import db from "../index.js"

class BookmarkModel {
    static async findAll(userId = null, options = {}) {
        let query = db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .select("categories.color as category_color")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")

        if (userId) {
            query = query.where("bookmarks.user_id", userId)
        }

        // 分类过滤
        if (options.categoryId) {
            query = query.where("bookmarks.category_id", options.categoryId)
        }

        // 标签过滤
        if (options.tagIds && options.tagIds.length > 0) {
            query = query
                .join("bookmark_tags", "bookmarks.id", "bookmark_tags.bookmark_id")
                .whereIn("bookmark_tags.tag_id", options.tagIds)
        }

        // 搜索过滤
        if (options.search) {
            const searchTerm = `%${options.search}%`
            query = query.where(function() {
                this.where("bookmarks.title", "like", searchTerm)
                    .orWhere("bookmarks.description", "like", searchTerm)
                    .orWhere("bookmarks.url", "like", searchTerm)
            })
        }

        // 排序
        const orderBy = options.orderBy || "created_at"
        const orderDirection = options.orderDirection || "desc"
        query = query.orderBy(`bookmarks.${orderBy}`, orderDirection)

        // 分页
        if (options.limit) {
            query = query.limit(options.limit)
        }
        if (options.offset) {
            query = query.offset(options.offset)
        }

        return query
    }

    static async findById(id, userId = null) {
        let query = db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .select("categories.color as category_color")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .where("bookmarks.id", id)

        if (userId) {
            query = query.where("bookmarks.user_id", userId)
        }

        return query.first()
    }

    static async create(data) {
        // 提取 tags 和 links，避免插入到 bookmarks 表
        const { tags, links, ...bookmarkData } = data
        
        const bookmark = await db("bookmarks").insert({
            ...bookmarkData,
            created_at: db.fn.now(),
            updated_at: db.fn.now(),
            last_visited: db.fn.now(),
        }).returning("*")

        // 如果有标签，创建标签关联
        if (tags && tags.length > 0) {
            await this.addTags(bookmark[0].id, tags, bookmarkData.user_id)
        }

        // 如果有多链接，创建链接记录
        if (links && links.length > 0) {
            await this.addLinks(bookmark[0].id, links)
        }

        return bookmark[0]
    }

    static async update(id, data, userId = null) {
        // 提取 tags 和 links，避免更新到 bookmarks 表
        const { tags, links, ...bookmarkData } = data
        
        let query = db("bookmarks").where("id", id)
        if (userId) {
            query = query.where("user_id", userId)
        }

        const bookmark = await query.update({
            ...bookmarkData,
            updated_at: db.fn.now(),
        }).returning("*")

        // 更新标签
        if (tags !== undefined) {
            await this.updateTags(id, tags, userId)
        }

        // 更新链接
        if (links !== undefined) {
            await this.updateLinks(id, links)
        }

        return bookmark[0]
    }

    static async delete(id, userId = null) {
        let query = db("bookmarks").where("id", id)
        if (userId) {
            query = query.where("user_id", userId)
        }
        return query.del()
    }

    static async incrementClickCount(id) {
        return db("bookmarks")
            .where("id", id)
            .increment("click_count", 1)
            .update({
                last_visited: db.fn.now(),
                updated_at: db.fn.now(),
            })
    }

    static async toggleFavorite(id, userId) {
        const bookmark = await this.findById(id, userId)
        if (!bookmark) return null

        return db("bookmarks")
            .where("id", id)
            .where("user_id", userId)
            .update({
                is_favorite: !bookmark.is_favorite,
                updated_at: db.fn.now(),
            })
            .returning("*")
    }

    static async getFavorites(userId, limit = 20) {
        return db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .where("bookmarks.user_id", userId)
            .where("bookmarks.is_favorite", true)
            .orderBy("bookmarks.updated_at", "desc")
            .limit(limit)
    }

    static async getRecentBookmarks(userId, limit = 10) {
        return db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .where("bookmarks.user_id", userId)
            .orderBy("bookmarks.last_visited", "desc")
            .limit(limit)
    }

    static async getPopularBookmarks(userId, limit = 10) {
        return db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .where("bookmarks.user_id", userId)
            .orderBy("bookmarks.click_count", "desc")
            .limit(limit)
    }

    static async getBookmarksByCategory(categoryId, userId, limit = 20) {
        return db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .where("bookmarks.category_id", categoryId)
            .where("bookmarks.user_id", userId)
            .orderBy("bookmarks.sort_order", "asc")
            .orderBy("bookmarks.created_at", "desc")
            .limit(limit)
    }

    static async getBookmarksByTag(tagId, userId, limit = 20) {
        return db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .join("bookmark_tags", "bookmarks.id", "bookmark_tags.bookmark_id")
            .where("bookmark_tags.tag_id", tagId)
            .where("bookmarks.user_id", userId)
            .orderBy("bookmarks.created_at", "desc")
            .limit(limit)
    }

    // 标签相关方法
    static async addTags(bookmarkId, tagNames, userId) {
        const tags = []
        for (const tagName of tagNames) {
            // 使用 findOrCreate 自动创建不存在的标签
            const tag = await db("tags")
                .where("name", tagName.trim())
                .where("user_id", userId)
                .first()
            
            if (tag) {
                tags.push(tag.id)
            } else {
                // 如果标签不存在，创建新标签
                const newTag = await db("tags").insert({
                    name: tagName.trim(),
                    user_id: userId,
                    created_at: db.fn.now(),
                    updated_at: db.fn.now(),
                }).returning("*")
                tags.push(newTag[0].id)
            }
        }

        if (tags.length > 0) {
            const bookmarkTags = tags.map(tagId => ({
                bookmark_id: bookmarkId,
                tag_id: tagId,
                created_at: db.fn.now(),
            }))
            await db("bookmark_tags").insert(bookmarkTags)
        }
    }

    static async updateTags(bookmarkId, tagNames, userId) {
        // 删除现有标签关联
        await db("bookmark_tags").where("bookmark_id", bookmarkId).del()
        
        // 添加新标签关联
        if (tagNames && tagNames.length > 0) {
            await this.addTags(bookmarkId, tagNames, userId)
        }
    }

    static async getTags(bookmarkId) {
        const tags = await db("tags")
            .select("tags.name")
            .join("bookmark_tags", "tags.id", "bookmark_tags.tag_id")
            .where("bookmark_tags.bookmark_id", bookmarkId)
            .orderBy("tags.name", "asc")
        
        // 返回标签名称数组
        return tags.map(tag => tag.name)
    }

    // 链接相关方法
    static async addLinks(bookmarkId, links) {
        if (links && links.length > 0) {
            const bookmarkLinks = links.map((link, index) => ({
                bookmark_id: bookmarkId,
                title: link.title,
                url: link.url,
                description: link.description,
                type: link.type || "link",
                sort_order: link.sort_order || index,
                created_at: db.fn.now(),
                updated_at: db.fn.now(),
            }))
            await db("bookmark_links").insert(bookmarkLinks)
        }
    }

    static async updateLinks(bookmarkId, links) {
        // 删除现有链接
        await db("bookmark_links").where("bookmark_id", bookmarkId).del()
        
        // 添加新链接
        if (links && links.length > 0) {
            await this.addLinks(bookmarkId, links)
        }
    }

    static async getLinks(bookmarkId) {
        const links = await db("bookmark_links")
            .select("title", "url", "type", "description")
            .where("bookmark_id", bookmarkId)
            .where("is_active", true)
            .orderBy("sort_order", "asc")
            .orderBy("created_at", "asc")
        
        return links
    }

    // 统计方法
    static async getStats(userId) {
        const [totalBookmarks] = await db("bookmarks")
            .where("user_id", userId)
            .count("* as count")

        const [favoriteBookmarks] = await db("bookmarks")
            .where("user_id", userId)
            .where("is_favorite", true)
            .count("* as count")

        const [totalClicks] = await db("bookmarks")
            .where("user_id", userId)
            .sum("click_count as total")

        return {
            total: parseInt(totalBookmarks.count),
            favorites: parseInt(favoriteBookmarks.count),
            totalClicks: parseInt(totalClicks.total) || 0,
        }
    }

    static async searchBookmarks(query, userId, options = {}) {
        const searchTerm = `%${query}%`
        let searchQuery = db("bookmarks")
            .select("bookmarks.*")
            .select("categories.name as category_name")
            .leftJoin("categories", "bookmarks.category_id", "categories.id")
            .where("bookmarks.user_id", userId)
            .where(function() {
                this.where("bookmarks.title", "like", searchTerm)
                    .orWhere("bookmarks.description", "like", searchTerm)
                    .orWhere("bookmarks.url", "like", searchTerm)
            })

        // 标签搜索
        if (options.includeTags) {
            searchQuery = searchQuery
                .leftJoin("bookmark_tags", "bookmarks.id", "bookmark_tags.bookmark_id")
                .leftJoin("tags", "bookmark_tags.tag_id", "tags.id")
                .orWhere("tags.name", "like", searchTerm)
        }

        return searchQuery
            .orderBy("bookmarks.updated_at", "desc")
            .limit(options.limit || 50)
    }
}

export default BookmarkModel
export { BookmarkModel }