use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use tracing::info;
use uuid::Uuid;

#[derive(Debug, Serialize, Deserialize)]
pub struct Album {
    pub id: Uuid,
    pub title: String,
    pub description: Option<String>,
    pub cover_image_id: Option<Uuid>,
    pub image_count: i64, // 新增图片数量字段
    pub created_at: String,
    pub updated_at: String,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Image {
    pub id: Uuid,
    pub album_id: Uuid,
    pub filename: String,
    pub original_url: Option<String>,
    pub title: Option<String>,
    pub description: Option<String>,
    pub file_size: i64,
    pub width: i32,
    pub height: i32,
    pub mime_type: String,
    pub created_at: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct AlbumWithImages {
    pub album: Album,
    pub images: Vec<Image>,
    pub image_count: i64,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct AlbumInfo {
    pub id: Uuid,
    pub title: String,
    pub document: String,
    pub description: Option<String>,
    pub cover_image_id: Option<String>,
    pub image_count: i64,
    pub created_at: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct CreateAlbum {
    pub title: String,
    pub document: String,
    pub description: Option<String>,
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct CreateImage {
    pub album_id: Uuid,
    pub filename: String,
    pub original_url: Option<String>,
    pub title: Option<String>,
    pub description: Option<String>,
    pub file_size: i64,
    pub width: i32,
    pub height: i32,
    pub mime_type: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct Favorite {
    pub id: Uuid,
    pub user_id: String,
    pub image_id: Uuid,
    pub album_id: Uuid,
    pub created_at: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct CreateFavorite {
    pub image_id: Uuid,
    pub album_id: Uuid,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct FavoriteWithImage {
    pub favorite: Favorite,
    pub image: Image,
    pub album_title: String,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct FavoriteStatus {
    pub is_favorited: bool,
    pub favorite_id: Option<Uuid>,
}
#[derive(Debug, Deserialize)]
pub struct AlbumIndex {
    pub title: String,
    pub images: Vec<String>,
}
// 内存缓存结构
#[derive(Debug, Clone)]
pub struct AlbumsCache {
    pub albums: Vec<AlbumInfo>,
    pub search_index: HashMap<String, Vec<AlbumInfo>>,
    pub last_updated: chrono::DateTime<chrono::Utc>,
}

impl AlbumsCache {
    pub fn new() -> Self {
        Self {
            albums: Vec::new(),
            search_index: HashMap::new(),
            last_updated: chrono::Utc::now(),
        }
    }

    pub fn is_expired(&self) -> bool {
        let now = chrono::Utc::now();
        let duration = now - self.last_updated;
        duration.num_minutes() >= 30 // 30分钟过期
    }

    pub fn update(&mut self, albums: Vec<AlbumInfo>) {
        self.albums = albums; // 不再克隆整个向量，而是移动所有权
        self.last_updated = chrono::Utc::now();

        // 构建搜索索引
        self.search_index.clear();
        for album in &self.albums {
            let title_lower = album.title.to_lowercase();

            // 为每个单词创建索引
            for word in title_lower.split_whitespace() {
                if word.len() >= 2 {
                    // 只索引长度>=2的单词
                    self.search_index
                        .entry(word.to_string())
                        .or_insert_with(Vec::new)
                        .push(album.clone()); // 这里仍需要克隆单个元素
                }
            }

            // 为完整标题创建索引
            self.search_index
                .entry(title_lower)
                .or_insert_with(Vec::new)
                .push(album.clone()); // 这里仍需要克隆单个元素
        }

        info!(
            "相册缓存已更新，共 {} 个相册，{} 个搜索索引项",
            self.albums.len(),
            self.search_index.len()
        );
    }

    pub fn search(&self, query: &str) -> Vec<AlbumInfo> {
        let query_lower = query.to_lowercase().trim().to_string();

        if query_lower.is_empty() {
            return Vec::new();
        }

        let mut results = Vec::new();
        let mut seen_ids = std::collections::HashSet::new();

        // 1. 搜索完整匹配（最高优先级）
        if let Some(matches) = self.search_index.get(&query_lower) {
            for album in matches {
                if seen_ids.insert(album.id) {
                    results.push(album.clone());
                }
            }
        }

        // 2. 搜索单词匹配
        for word in query_lower.split_whitespace() {
            if word.len() >= 2 {
                // 只搜索长度>=2的单词
                if let Some(matches) = self.search_index.get(word) {
                    for album in matches {
                        if seen_ids.insert(album.id) {
                            results.push(album.clone());
                        }
                    }
                }
            }
        }

        // 3. 模糊搜索：在相册标题和描述中搜索包含查询词的结果
        if results.is_empty() {
            for album in &self.albums {
                let title_lower = album.title.to_lowercase();
                let description_lower = album
                    .description
                    .as_ref()
                    .map(|d| d.to_lowercase())
                    .unwrap_or_default();

                // 检查标题或描述是否包含搜索词
                if title_lower.contains(&query_lower) || description_lower.contains(&query_lower) {
                    if seen_ids.insert(album.id) {
                        results.push(album.clone());
                    }
                }
            }
        }

        // 4. 如果还没有结果，尝试部分匹配（更宽松的搜索）
        if results.is_empty() && query_lower.len() >= 2 {
            for album in &self.albums {
                let title_lower = album.title.to_lowercase();

                // 检查标题是否包含搜索词的任何部分
                if query_lower
                    .split_whitespace()
                    .any(|word| word.len() >= 2 && title_lower.contains(word))
                {
                    if seen_ids.insert(album.id) {
                        results.push(album.clone());
                    }
                }
            }
        }

        results
    }
}