using OASystem.API.OAMethodLib.DeepSeekAPI;
using OASystem.API.OAMethodLib.Hotmail;
using OASystem.API.OAMethodLib.QiYeWeChatAPI;
using OASystem.Domain.ViewModels.QiYeWeChat;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Web;
using static OASystem.API.OAMethodLib.Hotmail.HotmailService;

namespace OASystem.API.OAMethodLib.Quartz.Business
{
    /// <summary>
    /// 获取hotmail邮件，自动总结邮件内容发送至企业微信邮件
    /// </summary>
    public static class ProcessAndNotifySummary
    {
        private static readonly SqlSugarClient _sqlSugar = AutofacIocManager.Instance.GetService<SqlSugarClient>();
        private static readonly IQiYeWeChatApiService _qiYeWeChatApiService = AutofacIocManager.Instance.GetService<IQiYeWeChatApiService>();
        private static readonly HotmailService _hotmailService = AutofacIocManager.Instance.GetService<HotmailService>();
        private static readonly IDeepSeekService _deepSeekService = AutofacIocManager.Instance.GetService<IDeepSeekService>();

        /// <summary>
        /// hotmail 邮件 汇总 发送企微邮件
        /// 时间范围 昨天
        /// </summary>
        public static async void ProcessAndNotifySummaryAsync()
        {
            var hotmailConfigs = await _hotmailService.GetUserMailConfigListAsync();
            if (hotmailConfigs == null || !hotmailConfigs.Any()) return;

            var hotmails = hotmailConfigs.Select(x => x.UserName).ToList();
            var userIds = hotmailConfigs.Select(x => x.UserId).ToList();

            var cstZone = CommonFun.GetCstZone();
            var nowInCst = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, cstZone);
            var yesterdayStart = nowInCst.Date.AddDays(-1);
            var yesterdayEnd = yesterdayStart.AddDays(3).AddTicks(-1);

            var emailInfos = await _hotmailService.GetMergedMessagesAsync(hotmails, yesterdayStart, yesterdayEnd);

            // 处理无邮件情况
            if (emailInfos == null || !emailInfos.Any())
            {
                await NotifyEmptyEmails(userIds);
                return;
            }

            // 1. 预处理：限制每封邮件正文长度，防止 Token 溢出
            foreach (var mail in emailInfos)
            {
                mail.Content = CleanHtmlToPlainText(mail.Content);
            }

            // 2. 调用 AI
            var question = BuildMailSummaryPrompt(emailInfos);
            var res = await _deepSeekService.ChatAsync(question);

            if (res.Success)
            {
                // 清洗 AI 可能带出的 Markdown 格式符
                string cleanJson = res.Answer.Trim();
                if (cleanJson.StartsWith("```json")) cleanJson = cleanJson.Replace("```json", "").Replace("```", "").Trim();

                try
                {
                    var aiSummaryResults = JsonConvert.DeserializeObject<List<AiSummaryResult>>(cleanJson);
                    var users = await _sqlSugar.Queryable<Sys_Users>().Where(x => x.IsDel == 0 && userIds.Contains(x.Id)).Select(x => new { x.Id, x.Email }).ToListAsync();

                    foreach (var hotmailConfig in hotmailConfigs)
                    {
                        var qwEmail = users.FirstOrDefault(x => x.Id == hotmailConfig.UserId)?.Email;
                        if (string.IsNullOrEmpty(qwEmail)) continue;

                        if (hotmailConfig.UserName.Equals("925554512@qq.com"))
                        {
                            hotmailConfig.UserName = "Roy.Lei.Atom@hotmail.com";
                        }

                        // 获取 AI 为该账号生成的摘要
                        var summary = aiSummaryResults?.FirstOrDefault(x => x.Recipient.Equals(hotmailConfig.UserName, StringComparison.OrdinalIgnoreCase));

                        string finalSubject = $"{DateTime.Now:yyyy-MM-dd} - 邮件汇总";
                        string finalBody = "AI 未能成功生成今日摘要。";

                        if (summary != null)
                        {
                            finalSubject = $"[AI摘要] {summary.EmailSubject}";
                            finalBody = summary.HtmlBody;
                        }

                        await _qiYeWeChatApiService.EmailSendAsync(new EmailRequestDto
                        {
                            ToEmails = new List<string> { qwEmail },
                            Subject = finalSubject,
                            Body = finalBody,
                        });
                    }
                }
                catch (Exception ex)
                {
                    // 记录解析 JSON 失败日志
                }
            }
        }


        /// <summary>
        /// 纯正则实现：剔除 HTML 标签、样式和脚本，保留核心文本
        /// </summary>
        private static string CleanHtmlToPlainText(string? html)
        {
            if (string.IsNullOrEmpty(html)) return string.Empty;

            // 1. 剔除脚本 (Script) 和 样式 (Style) 及其内部内容
            html = Regex.Replace(html, @"<(script|style)[^>]*?>.*?</\1>", "", RegexOptions.IgnoreCase | RegexOptions.Singleline);

            // 2. 剔除所有 HTML 标签
            html = Regex.Replace(html, @"<[^>]*>", " ");

            // 3. 将 HTML 实体字符转换回普通字符 (例如 &nbsp; -> 空格, &lt; -> <)
            html = HttpUtility.HtmlDecode(html);

            // 4. 清理多余的空白字符和重复换行
            html = Regex.Replace(html, @"\s+", " "); // 将多个空格/换行合并为一个空格
            html = Regex.Replace(html, @"(\n\s*){2,}", "\n"); // 压缩重复换行

            return html.Trim();
        }


        public static string BuildMailSummaryPrompt(List<MailDto> mailList)
        {
            var rawDataJson = System.Text.Json.JsonSerializer.Serialize(mailList, new JsonSerializerOptions { WriteIndented = false });

            return $@"
# Role: 高级邮件情报官 (Senior Email Intelligence Officer)

## Task
分析提供的 {mailList.Count} 封原始邮件，排除垃圾内容，并为每个收件人生成 HTML 格式的每日摘要报告。

## Rule & Logic
1. **Filtering**: 严禁包含：自动订阅、社交媒体动态、验证码、退订链接邮件。
2. **Analysis**: 对同一收件人的邮件按业务逻辑归类（如：财务类、技术类、会议类）。
3. **HTML Requirements**: 
   - 必须使用 `border-collapse: collapse; width: 100%;` 的表格。
   - 主题色使用蓝色 (#2563eb)。
   - 包含三部分：【核心概览】、【详情表格 (列: 时间, 主题, 来源, 摘要)】、【待办建议 (Action Items)】。
   - 所有 CSS 必须 Inline Style。

## HTML Format (Strict)
- 仅允许使用: <h3> (标题), <p> (段落), <ul>/<li> (列表), <strong> (加粗), <hr> (分割线)。
- 禁止使用: <table>, <div>, <span>, class, id。
- 样式: 仅在 <h3> 中使用 style=""color:#2563eb""。

## Constraints
- 输出必须是合法的 JSON 数组，严禁任何前言或后缀文字。
- 属性名：Recipient, EmailSubject, HtmlBody。
- HtmlBody 必须是完整的 HTML 字符串，注意 JSON 内部引号转义。

## Input Data (JSON)
{rawDataJson}
";
        }

        private static async Task NotifyEmptyEmails(List<int> userIds)
        {
            var userEmails = await _sqlSugar.Queryable<Sys_Users>().Where(x => x.IsDel == 0 && userIds.Contains(x.Id)).Select(x => x.Email).ToListAsync();
            if (userEmails.Any())
            {
                await _qiYeWeChatApiService.EmailSendAsync(new EmailRequestDto
                {
                    ToEmails = userEmails,
                    Subject = $"{DateTime.Now:yyyy-MM-dd} - 邮件汇总",
                    Body = "昨日暂未收到有效邮件。"
                });
            }
        }

        public class AiSummaryResult
        {
            public string Recipient { get; set; } = string.Empty;
            public string EmailSubject { get; set; } = string.Empty;
            public string HtmlBody { get; set; } = string.Empty;
        }
    }
}