//! Tauri 命令：剪贴板模块

use base64::engine::general_purpose::STANDARD;
use base64::Engine as _;
use serde::Serialize;
use specta::Type;
use tauri::{AppHandle, State};

use super::manager::{ClipboardManager, ClipboardSettings};
use super::reader::{dib_to_png, dib_to_thumbnail};
use super::storage::{ClipboardItem, ClipboardItemDetail};

#[derive(Serialize, Type)]
#[serde(rename_all = "camelCase")]
pub struct ClipboardStatus {
    pub running: bool,
    pub count: i64,
}

fn img_to_base64(b: &[u8]) -> Option<String> {
    dib_to_png(b).map(|png| STANDARD.encode(&png))
}

/// 历史查询结果（含总数，用于分页）
#[derive(Serialize, Type)]
#[serde(rename_all = "camelCase")]
pub struct HistoryPage {
    pub items: Vec<ClipboardItem>,
    pub total: i64,
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_get_history(
    limit: Option<i64>,
    offset: Option<i64>,
    kind: Option<String>,
    manager: State<'_, ClipboardManager>,
) -> Result<HistoryPage, String> {
    let storage = manager.storage().clone();
    let kind = kind.unwrap_or_else(|| "all".into());
    let limit = limit.unwrap_or(50);
    let offset = offset.unwrap_or(0);
    // SQLite 查询移出 async runtime 线程
    tauri::async_runtime::spawn_blocking(move || {
        let items = storage.get_history(limit, offset, &kind);
        let total = storage.count_kind(&kind);
        HistoryPage { items, total }
    })
    .await
    .map_err(|e| format!("查询任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_get_pinned(
    manager: State<'_, ClipboardManager>,
) -> Result<Vec<ClipboardItem>, String> {
    let storage = manager.storage().clone();
    tauri::async_runtime::spawn_blocking(move || storage.get_pinned())
        .await
        .map_err(|e| format!("查询任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_search(
    query: String,
    limit: Option<i64>,
    offset: Option<i64>,
    manager: State<'_, ClipboardManager>,
) -> Result<HistoryPage, String> {
    let storage = manager.storage().clone();
    let limit = limit.unwrap_or(50);
    let offset = offset.unwrap_or(0);
    tauri::async_runtime::spawn_blocking(move || {
        let items = storage.search(&query, limit, offset);
        let total = storage.count_search(&query);
        HistoryPage { items, total }
    })
    .await
    .map_err(|e| format!("查询任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_get_item(
    id: i64,
    manager: State<'_, ClipboardManager>,
) -> Result<Option<ClipboardItemDetail>, String> {
    let storage = manager.storage().clone();
    // get_detail 内部：锁内取数 + 锁外 base64 编码，整体移出主线程
    tauri::async_runtime::spawn_blocking(move || storage.get_detail(id, img_to_base64))
        .await
        .map_err(|e| format!("查询任务失败: {}", e))
}

/// 获取图片缩略图 PNG base64（弹窗悬停预览用，避免加载全尺寸图片）
#[tauri::command]
#[specta::specta]
pub async fn clipboard_get_thumb(
    id: i64,
    manager: State<'_, ClipboardManager>,
) -> Result<Option<String>, String> {
    let storage = manager.storage().clone();
    tauri::async_runtime::spawn_blocking(move || {
        storage.get_thumb(id, |dib| dib_to_thumbnail(dib, 256))
    })
    .await
    .map_err(|e| format!("查询任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_set_pinned(
    id: i64,
    pinned: bool,
    manager: State<'_, ClipboardManager>,
) -> Result<bool, String> {
    let storage = manager.storage().clone();
    tauri::async_runtime::spawn_blocking(move || storage.set_pinned(id, pinned))
        .await
        .map_err(|e| format!("操作任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_delete(
    id: i64,
    manager: State<'_, ClipboardManager>,
) -> Result<bool, String> {
    let storage = manager.storage().clone();
    tauri::async_runtime::spawn_blocking(move || storage.delete(id))
        .await
        .map_err(|e| format!("删除任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_clear(manager: State<'_, ClipboardManager>) -> Result<bool, String> {
    let storage = manager.storage().clone();
    tauri::async_runtime::spawn_blocking(move || storage.clear_non_pinned())
        .await
        .map_err(|e| format!("清空任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_copy_back(
    id: i64,
    manager: State<'_, ClipboardManager>,
) -> Result<(), String> {
    manager.copy_back(id)
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_count(manager: State<'_, ClipboardManager>) -> Result<i64, String> {
    let storage = manager.storage().clone();
    tauri::async_runtime::spawn_blocking(move || storage.count())
        .await
        .map_err(|e| format!("查询任务失败: {}", e))
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_get_settings(
    manager: State<'_, ClipboardManager>,
) -> Result<ClipboardSettings, String> {
    Ok(manager.get_settings())
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_save_settings(
    settings: ClipboardSettings,
    app: AppHandle,
    manager: State<'_, ClipboardManager>,
) -> Result<(), String> {
    let prev = manager.get_settings();
    let prev_enabled = prev.enabled;
    let prev_shortcut = prev.shortcut.clone();

    // 快捷键变化且新值非空：先注册（原子化 + 冲突检测），成功后才保存设置。
    // 注册失败时恢复旧快捷键并中止保存，避免设置被写入无法生效的组合键、旧键丢失。
    if settings.shortcut != prev_shortcut && !settings.shortcut.trim().is_empty() {
        if let Err(e) = crate::shortcut::register_shortcut(&app, "剪贴板", &settings.shortcut, |a| {
            super::popup::show_popup(a)
        }) {
            // register_shortcut 内部已注销旧快捷键，失败时需重新注册旧键以恢复
            if !prev_shortcut.trim().is_empty() {
                let _ = crate::shortcut::register_shortcut(&app, "剪贴板", &prev_shortcut, |a| {
                    super::popup::show_popup(a)
                });
            }
            return Err(e);
        }
        // 新快捷键非空时确保弹窗/预览窗口已预创建
        super::popup::ensure_popup_window(&app);
        super::popup::ensure_preview_window(&app);
    }

    // 保存设置
    manager.save_settings(settings.clone());

    // 监听开关变化时联动启停
    if settings.enabled && !prev_enabled {
        manager.start(&app);
    } else if !settings.enabled && prev_enabled {
        manager.stop();
    }

    // 快捷键改为空字符串（禁用）：注销旧快捷键
    if settings.shortcut.trim().is_empty() && settings.shortcut != prev_shortcut {
        crate::shortcut::unregister_shortcut(&app, "剪贴板");
    }

    Ok(())
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_status(
    manager: State<'_, ClipboardManager>,
) -> Result<ClipboardStatus, String> {
    let storage = manager.storage().clone();
    let running = manager.is_running();
    let count = tauri::async_runtime::spawn_blocking(move || storage.count())
        .await
        .map_err(|e| format!("查询任务失败: {}", e))?;
    Ok(ClipboardStatus { running, count })
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_start(app: AppHandle, manager: State<'_, ClipboardManager>) -> Result<(), String> {
    manager.start(&app);
    Ok(())
}

#[tauri::command]
#[specta::specta]
pub async fn clipboard_stop(manager: State<'_, ClipboardManager>) -> Result<(), String> {
    manager.stop();
    Ok(())
}

/// 注册（或切换）快捷弹窗全局快捷键
#[tauri::command]
#[specta::specta]
pub async fn clipboard_register_shortcut(
    shortcut: String,
    app: AppHandle,
) -> Result<(), String> {
    crate::shortcut::register_shortcut(&app, "剪贴板", &shortcut, |a| {
        super::popup::show_popup(a)
    })
}

/// 注销快捷弹窗全局快捷键
#[tauri::command]
#[specta::specta]
pub async fn clipboard_unregister_shortcut(app: AppHandle) -> Result<(), String> {
    crate::shortcut::unregister_shortcut(&app, "剪贴板");
    Ok(())
}

/// 手动触发显示快捷弹窗（供 UI 按钮调用）
#[tauri::command]
#[specta::specta]
pub async fn clipboard_show_popup(app: AppHandle) -> Result<(), String> {
    super::popup::show_popup(&app);
    Ok(())
}

/// 隐藏快捷弹窗
#[tauri::command]
#[specta::specta]
pub async fn clipboard_hide_popup(app: AppHandle) -> Result<(), String> {
    super::popup::hide_popup(&app);
    Ok(())
}

/// 显示已创建的弹窗窗口（前端 onMounted 后调用）
#[tauri::command]
#[specta::specta]
pub async fn clipboard_show_window(app: AppHandle) -> Result<(), String> {
    super::popup::show_window(&app);
    Ok(())
}

/// 隐藏弹窗并模拟 Ctrl+V 粘贴到原窗口
#[tauri::command]
#[specta::specta]
pub async fn clipboard_paste_to_target(app: AppHandle) -> Result<(), String> {
    super::popup::paste_to_target(&app);
    Ok(())
}

/// 在弹窗旁显示独立预览窗口（悬停/键盘选中时调用）
#[tauri::command]
#[specta::specta]
pub async fn clipboard_show_preview(app: AppHandle, id: i64) -> Result<(), String> {
    super::popup::show_preview(&app, id);
    Ok(())
}

/// 隐藏独立预览窗口
#[tauri::command]
#[specta::specta]
pub async fn clipboard_hide_preview(app: AppHandle) -> Result<(), String> {
    super::popup::hide_preview(&app);
    Ok(())
}

/// 按内容自适应调整预览窗大小（逻辑像素）。前端加载内容（文本测高、图片按宽高比）后调用，
/// 窗口贴合内容消除留白；后端按弹窗所在屏工作区钳制并重新对齐弹窗。
/// allow_flip：初始落位为 true（优先侧放不下可换侧）；放大/还原为 false（保持原侧）。
#[tauri::command]
#[specta::specta]
pub async fn clipboard_resize_preview(
    app: AppHandle,
    width: f64,
    height: f64,
    allow_flip: bool,
) -> Result<(), String> {
    super::popup::resize_preview(&app, width, height, allow_flip);
    Ok(())
}

/// 显示已就绪的预览窗口。前端完成内容加载与 resize 后调用，窗口以最终尺寸出现，
/// 消除"先以上次尺寸（可能是放大态大窗）显示再缩回"的闪烁。
#[tauri::command]
#[specta::specta]
pub async fn clipboard_reveal_preview(app: AppHandle) -> Result<(), String> {
    super::popup::reveal_preview(&app);
    Ok(())
}

/// 预览窗交互锁定：前端预览窗收到 mousedown（放大/缩小、复制、选择文本）时调用。
/// 此后弹窗+预览不因失焦/鼠标离开而关闭，仅当点击外部或弹窗重新聚焦时退出锁定。
#[tauri::command]
#[specta::specta]
pub async fn clipboard_preview_interacted(app: AppHandle) -> Result<(), String> {
    super::popup::preview_interacted(&app);
    Ok(())
}