# -*- coding: utf-8 -*-
"""
email_ui.py  —  一键群发工具 (强化校验版)
--------------------------------------
运行:  python email_ui.py
"""
import os, logging, re, random
from datetime import datetime
import gradio as gr
from send_email_module import send_email

EMAIL_CONFIG_KEY = "default"           # 对应 config/default.json
LOG_FILE = "email_send_log.txt"
logging.basicConfig(level=logging.INFO,
                    format="%(asctime)s  %(levelname)s  %(message)s")

EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")   # 简易邮箱正则


# -------------------- 工具 --------------------
def _load_template(file_obj):
    if file_obj is None:
        return ""
    with open(file_obj.name, "r", encoding="utf-8") as f:
        return f.read()


def _error(msg):
    """生成统一的红字提示 + 让 state 为空 -> Send 仍锁定"""
    return gr.update(value=f"<p style='color:red'>❌ {msg}</p>"), None


# -------------------- 预览 --------------------
def preview_email(to_addrs, subject, html_file, language,
                  want_receipt, want_read_receipt):
    # 0. 模板存在
    tpl = _load_template(html_file)
    if not tpl:
        return _error("请先上传 HTML 模板")

    # 1. 收件人非空且格式合法
    raw_addrs = [a.strip() for a in to_addrs.split(",") if a.strip()]
    if not raw_addrs:
        return _error("收件人邮箱不能为空")
    if invalid := [a for a in raw_addrs if not EMAIL_RE.match(a)]:
        return _error(f"邮箱格式非法: {', '.join(invalid)}")

    # 2. 主题非空
    if not subject.strip():
        return _error("主题不能为空")

    # 3. 模板至少包含 {{recipient_name}}
    if "{{recipient_name}}" not in tpl:
        return _error("模板缺少 {{recipient_name}} 占位符")

    # ---- 全部通过，生成预览 ----
    preview = (tpl.replace("{{recipient_name}}", "there")
                 .replace("{{recipient_email}}", "example@example.com")
                 .replace("{{encoded_recipient_email}}", "ENCODED_EXAMPLE")
                 .replace("{{timestamp}}", datetime.now().isoformat()))

    state = {
        "addresses": raw_addrs,
        "subject": subject.strip(),
        "template": tpl,
        "language": language,
        "want_receipt": want_receipt,
        "want_read_receipt": want_read_receipt,
    }
    return gr.update(value=preview), state


# -------------------- 发送 --------------------
def send_emails(state):
    if not state:
        return "⚠️ 请先 Preview 成功后再发送。"
    out_lines = []
    for addr in state["addresses"]:
        res = send_email(
            EMAIL_CONFIG_KEY, addr, state["subject"], state["template"], "",
            request_receipt=state["want_receipt"],
            request_read_receipt=state["want_read_receipt"],
            language=state["language"],
        )
        ts = datetime.now().isoformat(timespec="seconds")
        line = f"{ts}\t{addr}\t{res['status']}\t{res['message']}"
        out_lines.append(line)
        with open(LOG_FILE, "a", encoding="utf-8") as f:
            f.write(line + "\n")
    return "<br>".join(out_lines).replace("\n", "<br>")


# -------------------- Gradio UI --------------------
with gr.Blocks(css=".gr-button {min-width:8rem}") as demo:
    gr.Markdown("## ✉️ 简易 EDM 群发工具")

    addrs = gr.Textbox(label="收件人（逗号分隔）", placeholder="foo@bar.com, alice@x.com")
    subj  = gr.Textbox(label="主题", placeholder="Subject here")
    tpl   = gr.File(label="上传 HTML 模板")
    lang  = gr.Radio(["english", "chinese"], value="chinese", label="语言")
    with gr.Row():
        rcpt    = gr.Checkbox(label="投递回执")
        read_r  = gr.Checkbox(label="已读回执")

    preview_btn = gr.Button("Preview ⬇️")
    send_btn    = gr.Button("Send (确认发送) ✈️", interactive=False)
    out_html    = gr.HTML()
    state_box   = gr.State()

    preview_btn.click(
        preview_email,
        [addrs, subj, tpl, lang, rcpt, read_r],
        [out_html, state_box]
    ).then(
        lambda s: gr.update(interactive=s is not None),
        inputs=state_box, outputs=send_btn
    )
    send_btn.click(send_emails, state_box, out_html)

if __name__ == "__main__":
    demo.queue().launch(server_port=7880, show_api=False)