import { getDbInstance, runDb, getDb as getDbRow, allDb } from '../database/connection';
import { Database, RunResult } from 'sqlite3'; // Import Database type if needed by helpers

// 定义数据库行的接口
export interface SshKeyDbRow {
    id: number;
    name: string;
    encrypted_private_key: string;
    encrypted_passphrase?: string | null; // 密码短语是可选的
    created_at: number;
    updated_at: number;
}

// 定义创建时需要的数据接口 (不包含 id, created_at, updated_at)
export type CreateSshKeyData = Omit<SshKeyDbRow, 'id' | 'created_at' | 'updated_at'>;

// 定义更新时需要的数据接口 (所有字段可选，除了 id)
export type UpdateSshKeyData = Partial<Omit<SshKeyDbRow, 'id' | 'created_at'>>;

/**
 * 创建新的 SSH 密钥记录
 * @param data - 包含密钥名称和加密后凭证的对象
 * @returns Promise<number> 新创建记录的 ID
 */
export const createSshKey = async (data: CreateSshKeyData): Promise<number> => {
    const sql = `
        INSERT INTO ssh_keys (name, encrypted_private_key, encrypted_passphrase, created_at, updated_at)
        VALUES (?, ?, ?, strftime('%s', 'now'), strftime('%s', 'now'))
    `;
    const params = [data.name, data.encrypted_private_key, data.encrypted_passphrase ?? null];
    try {
        const db = await getDbInstance();
        const result = await runDb(db, sql, params);
        if (typeof result.lastID !== 'number' || result.lastID <= 0) {
            throw new Error('创建 SSH 密钥后未能获取有效的 lastID');
        }
        console.log(`Repository: SSH 密钥创建成功，ID: ${result.lastID}`);
        return result.lastID;
    } catch (err: any) { // Catch potential errors from helpers
        console.error('Repository: 创建 SSH 密钥失败:', err.message);
        throw new Error(`创建 SSH 密钥失败: ${err.message}`);
    }
};

/**
 * 根据 ID 查找 SSH 密钥
 * @param id - 密钥 ID
 * @returns Promise<SshKeyDbRow | null> 找到的密钥记录或 null
 */
export const findSshKeyById = async (id: number): Promise<SshKeyDbRow | null> => {
    const sql = `SELECT * FROM ssh_keys WHERE id = ?`;
    try {
        const db = await getDbInstance();
        const row = await getDbRow<SshKeyDbRow>(db, sql, [id]);
        return row || null;
    } catch (err: any) {
        console.error(`Repository: 查找 SSH 密钥 ${id} 失败:`, err.message);
        throw new Error(`查找 SSH 密钥失败: ${err.message}`);
    }
};

/**
 * 查找所有 SSH 密钥 (只包含 id 和 name，用于列表显示)
 * @returns Promise<{ id: number; name: string }[]> 密钥列表
 */
export const findAllSshKeyNames = async (): Promise<{ id: number; name: string }[]> => {
    const sql = `SELECT id, name FROM ssh_keys ORDER BY name ASC`;
    try {
        const db = await getDbInstance();
        const rows = await allDb<{ id: number; name: string }>(db, sql);
        return rows;
    } catch (err: any) {
        console.error('Repository: 查找所有 SSH 密钥名称失败:', err.message);
        throw new Error(`查找所有 SSH 密钥名称失败: ${err.message}`);
    }
};


/**
 * 更新 SSH 密钥记录
 * @param id - 要更新的密钥 ID
 * @param data - 包含要更新字段的对象
 * @returns Promise<boolean> 是否更新成功
 */
export const updateSshKey = async (id: number, data: UpdateSshKeyData): Promise<boolean> => {
    // 过滤掉 undefined 的值
    const fieldsToUpdate = Object.entries(data)
        .filter(([_, value]) => value !== undefined)
        .reduce((obj, [key, value]) => {
            (obj as any)[key] = value;
            return obj;
        }, {} as { [key: string]: any }); // Type assertion for index signature

    if (Object.keys(fieldsToUpdate).length === 0) {
        console.log(`Repository: 更新 SSH 密钥 ${id} 时没有提供有效字段。`);
        return true; // 没有字段需要更新
    }

    // 添加 updated_at 时间戳
    fieldsToUpdate.updated_at = Math.floor(Date.now() / 1000);

    const setClause = Object.keys(fieldsToUpdate).map(field => `${field} = ?`).join(', ');
    const values = Object.values(fieldsToUpdate).map(value => value ?? null); // 处理 null 值

    const sql = `UPDATE ssh_keys SET ${setClause} WHERE id = ?`;
    const params = [...values, id];

    try {
        const db = await getDbInstance();
        const result = await runDb(db, sql, params);
        return result.changes > 0; // 如果有行被改变则返回 true
    } catch (err: any) {
        console.error(`Repository: 更新 SSH 密钥 ${id} 失败:`, err.message);
        throw new Error(`更新 SSH 密钥失败: ${err.message}`);
    }
};

/**
 * 删除 SSH 密钥记录
 * @param id - 要删除的密钥 ID
 * @returns Promise<boolean> 是否删除成功
 */
export const deleteSshKey = async (id: number): Promise<boolean> => {
    const sql = `DELETE FROM ssh_keys WHERE id = ?`;
    try {
        const db = await getDbInstance();
        const result = await runDb(db, sql, [id]);
        return result.changes > 0; // 如果有行被删除则返回 true
    } catch (err: any) {
        console.error(`Repository: 删除 SSH 密钥 ${id} 失败:`, err.message);
        throw new Error(`删除 SSH 密钥失败: ${err.message}`);
    }
};