"""Streamlit 多轮对话 UI，用于 JRXML 生成代理。

支持:
- 流式输出（LLM 逐字展示）
- 节点平铺展开（每个处理阶段独立展示）
- 完成后自动折叠节点区
- 过程总结卡片
"""

import os
import sys
from pathlib import Path

import streamlit as st

from dotenv import load_dotenv
load_dotenv()

from agent.graph import build_graph, create_initial_state
from backend.session import (
    create_session,
    load_session,
    delete_session,
    list_all_sessions,
)

st.set_page_config(
    page_title="JRXML 代理",
    page_icon="📊",
    layout="wide",
    initial_sidebar_state="expanded",
)

# 阻止 Streamlit 裸 'c' 键清除缓存，保留 Ctrl+C 复制行为
st.components.v1.html("""
<script>
(function() {
    const parent = window.parent.document;
    parent.addEventListener('keydown', function(e) {
        // 仅拦截裸 'c' 键（非 Ctrl/Cmd 组合）
        if (e.key === 'c' && !e.ctrlKey && !e.metaKey && !e.altKey) {
            const tag = parent.activeElement ? parent.activeElement.tagName : '';
            if (tag !== 'INPUT' && tag !== 'TEXTAREA' && !parent.activeElement.isContentEditable) {
                e.stopImmediatePropagation();
                e.preventDefault();
            }
        }
    }, true);
})();
</script>
""", height=0)

# ---- 节点名称 → 中文标签 ----
NODE_LABELS = {
    "load_session":       "📂 加载会话",
    "process_input":      "📝 记录输入",
    "manage_context":     "🧠 管理上下文",
    "save_state_snapshot": "💾 保存快照",
    "classify_intent":    "🔍 识别意图",
    "retrieve":           "📚 检索模板",
    "generate":           "⚙️ 生成 JRXML",
    "modify_jrxml":       "🔧 修改 JRXML",
    "validate":           "✅ 验证",
    "explain_error":      "🔎 分析错误",
    "correct_jrxml":      "🛠 自动修正",
    "finalize":           "📋 完成",
    "handle_consult":     "💬 咨询回答",
    "handle_undo":        "↩ 撤销操作",
    "handle_reset":       "🔄 重置会话",
    "save_session":       "💾 保存会话",
}

INTENT_LABELS = {
    "initial_generation": "新建报表",
    "modify_report":      "修改报表",
    "preview_report":     "预览报表",
    "export_pdf":         "导出 PDF",
    "export_jrxml":       "下载 JRXML",
    "undo_modification":  "撤销修改",
    "consult_question":   "咨询问题",
    "reset_session":      "重置会话",
}

SKIP_NODES = {"load_session", "process_input", "manage_context",
              "save_state_snapshot", "save_session"}


def _render_jrxml(jrxml: str, max_lines: int = 30):
    """展示 JRXML 代码（折叠、限行）。"""
    lines = jrxml.strip().split("\n")
    preview = "\n".join(lines[:max_lines])
    if len(lines) > max_lines:
        preview += f"\n... (共 {len(lines)} 行)"
    st.code(preview, language="xml")


# ---- URL 参数 ----
query_params = st.query_params
url_session_id = query_params.get("session_id", "")

# ---- 会话状态初始化 ----
if "messages" not in st.session_state:
    st.session_state.messages = []
if "graph" not in st.session_state:
    st.session_state.graph = build_graph()
if "pending_action" not in st.session_state:
    st.session_state.pending_action = None

if "agent_state" not in st.session_state:
    if url_session_id:
        data = load_session(url_session_id)
        if data and data.get("agent_state"):
            st.session_state.agent_state = data["agent_state"]
            st.session_state.agent_state["session_id"] = url_session_id
        else:
            st.session_state.agent_state = create_initial_state()
            new_data = create_session(name="", agent_state=st.session_state.agent_state)
            st.session_state.agent_state["session_id"] = new_data["session_id"]
            st.session_state.agent_state["session_name"] = new_data["session_name"]
            st.session_state.agent_state["created_at"] = new_data["created_at"]
    else:
        st.session_state.agent_state = create_initial_state()
        new_data = create_session(name="", agent_state=st.session_state.agent_state)
        st.session_state.agent_state["session_id"] = new_data["session_id"]
        st.session_state.agent_state["session_name"] = new_data["session_name"]
        st.session_state.agent_state["created_at"] = new_data["created_at"]

current_session_id = st.session_state.agent_state.get("session_id", "")


def run_agent(user_input: str):
    """运行代理图：流式渲染节点进度 + LLM 文本。"""
    agent_state = st.session_state.agent_state

    if agent_state.get("current_jrxml") and agent_state.get("status") == "pass":
        agent_state["user_modification_request"] = user_input

    agent_state["user_input"] = user_input
    agent_state["retry_count"] = 0

    # ---- UI 容器 ----
    streaming_placeholder = st.empty()   # 流式文本
    nodes_container = st.container()      # 节点进度区
    summary_placeholder = st.empty()      # 总结卡片

    # 节点追踪
    executed_nodes: list[dict] = []  # {name, label, status, detail}
    stream_text = ""
    stream_active = False
    current_stream_node = ""
    final_state = None

    try:
        for event in st.session_state.graph.stream(
            agent_state, stream_mode=["updates", "custom"]
        ):
            mode, data = event

            if mode == "updates":
                for node_name, node_state in data.items():
                    label = NODE_LABELS.get(node_name, node_name)
                    if node_name not in SKIP_NODES:
                        executed_nodes.append({
                            "name": node_name,
                            "label": label,
                        })

                    if node_name == "classify_intent":
                        intent = node_state.get("intent", "")
                        il = INTENT_LABELS.get(intent, intent)
                        executed_nodes[-1]["detail"] = f"意图: {il}"

                    elif node_name == "retrieve":
                        ctx = node_state.get("retrieved_context", "")
                        executed_nodes[-1]["detail"] = (
                            f"找到 {len(ctx)} 字符参考模板" if ctx else "未匹配到模板"
                        )

                    elif node_name in ("generate", "modify_jrxml", "correct_jrxml"):
                        # 流式文本已在上面的 custom 事件中展示
                        jrxml = node_state.get("current_jrxml", "")
                        executed_nodes[-1]["detail"] = f"生成 {len(jrxml)} 字符 JRXML"

                    elif node_name == "validate":
                        status = node_state.get("status", "")
                        if status == "pass":
                            executed_nodes[-1]["detail"] = "验证通过 ✓"
                        else:
                            err = node_state.get("error_msg", "")
                            executed_nodes[-1]["detail"] = f"验证失败: {err[:80]}"

                    elif node_name == "explain_error":
                        expl = node_state.get("natural_explanation", "")
                        executed_nodes[-1]["detail"] = expl[:120]

                    elif node_name == "handle_consult":
                        ans = node_state.get("consult_answer", "")
                        executed_nodes[-1]["detail"] = ans[:150]

                    final_state = node_state

            elif mode == "custom":
                cd = data
                if cd.get("type") == "stream":
                    stream_text += cd.get("text", "")
                    stream_active = True
                    current_stream_node = cd.get("node", "")
                    streaming_placeholder.code(stream_text, language="xml")

    except Exception as e:
        st.error(f"工作流异常: {e}")
        return

    # ---- 渲染节点进度区 ----
    with nodes_container:
        with st.expander("处理过程", expanded=False):
            for i, node in enumerate(executed_nodes):
                icon = "✓" if i < len(executed_nodes) - 1 else "●"
                detail_str = f" — {node['detail']}" if node.get("detail") else ""
                st.caption(f"{icon} {node['label']}{detail_str}")

    # ---- 清除流式占位 ----
    if stream_active:
        streaming_placeholder.empty()

    # ---- 总结卡片 ----
    if final_state:
        st.session_state.agent_state = final_state
        intent = final_state.get("intent", "")
        status = final_state.get("status", "")

        with summary_placeholder.container(border=True):
            if intent == "consult_question":
                answer = final_state.get("consult_answer", "")
                st.info(answer)
                st.session_state.messages.append({
                    "role": "assistant", "content": answer, "type": "consult",
                })

            elif intent in ("undo_modification", "reset_session"):
                st.success("操作已完成")
                # 消息已在节点中添加

            elif intent in ("preview_report", "export_pdf", "export_jrxml"):
                jrxml = final_state.get("current_jrxml", "")
                if jrxml:
                    st.success("✅ 当前报表")
                    _render_jrxml(jrxml)
                    st.session_state.messages.append({
                        "role": "assistant", "content": jrxml, "type": "jrxml",
                    })
                else:
                    st.warning("⚠ 当前没有报表可以展示。")

            elif status == "pass":
                jrxml = final_state.get("current_jrxml", "")
                st.success("✅ JRXML 生成成功")
                st.markdown("**生成结果:**")
                _render_jrxml(jrxml)
                st.caption("您可以从侧边栏下载文件，或继续对话进行修改。")
                st.session_state.messages.append({
                    "role": "assistant", "content": jrxml, "type": "jrxml",
                })
                st.session_state.messages.append({
                    "role": "assistant",
                    "content": "✅ JRXML 生成成功！您可以从侧边栏下载文件，或继续修改。",
                    "type": "success",
                })

            else:
                jrxml = final_state.get("current_jrxml", "")
                error_msg = final_state.get("error_msg", "未知错误")
                explanation = final_state.get("natural_explanation", "")
                retries = final_state.get("retry_count", 0)
                st.error(f"❌ 经过 {retries} 次重试后仍无法生成有效的 JRXML")
                st.markdown(f"**错误:** {error_msg}")
                if explanation:
                    st.markdown(f"**原因:** {explanation}")
                if jrxml:
                    with st.expander("查看当前 JRXML"):
                        _render_jrxml(jrxml, max_lines=80)
                st.caption("请简化报表结构后重试。")
                st.session_state.messages.append({
                    "role": "assistant",
                    "content": f"❌ 经过 {retries} 次重试后仍无法生成有效的 JRXML。\n\n**错误:** {error_msg}",
                    "type": "error_explanation",
                })
    else:
        st.error("未产生结果，请重试。")


# ---- 侧边栏 ----
with st.sidebar:
    st.title("📊 JRXML 代理")
    st.markdown("通过自然语言生成 JasperReports 模板。")
    st.divider()

    # 会话管理
    st.markdown("### 会话管理")
    sessions = list_all_sessions()
    session_options = {}
    for s in sessions:
        sid = s["session_id"]
        name = s.get("session_name", sid)
        updated = s.get("updated_at", "")[:16]
        session_options[f"{name} ({updated})"] = sid

    selected_label = None
    for label, sid in session_options.items():
        if sid == current_session_id:
            selected_label = label
            break

    selected = st.selectbox(
        "切换会话",
        options=list(session_options.keys()),
        index=list(session_options.keys()).index(selected_label) if selected_label else 0,
        key="session_selector",
    )

    if selected and session_options.get(selected) != current_session_id:
        new_sid = session_options[selected]
        data = load_session(new_sid)
        if data and data.get("agent_state"):
            st.session_state.agent_state = data["agent_state"]
            st.session_state.messages = []
            st.rerun()

    col1, col2 = st.columns(2)
    with col1:
        if st.button("➕ 新建", use_container_width=True):
            new_data = create_session(name="", agent_state=create_initial_state())
            st.session_state.agent_state = create_initial_state()
            st.session_state.agent_state["session_id"] = new_data["session_id"]
            st.session_state.agent_state["session_name"] = new_data["session_name"]
            st.session_state.agent_state["created_at"] = new_data["created_at"]
            st.session_state.messages = []
            st.rerun()
    with col2:
        if st.button("🗑 删除", use_container_width=True):
            if current_session_id:
                delete_session(current_session_id)
            st.session_state.agent_state = create_initial_state()
            new_data = create_session(name="", agent_state=st.session_state.agent_state)
            st.session_state.agent_state["session_id"] = new_data["session_id"]
            st.session_state.agent_state["session_name"] = new_data["session_name"]
            st.session_state.agent_state["created_at"] = new_data["created_at"]
            st.session_state.messages = []
            st.rerun()

    current_name = st.session_state.agent_state.get("session_name", "")
    st.caption(f"当前: {current_name} (`{current_session_id}`)")

    st.divider()
    st.markdown("### 快捷操作")

    has_jrxml = bool(st.session_state.agent_state.get("current_jrxml", "").strip())
    has_history = bool(st.session_state.agent_state.get("history_states", []))

    qcol1, qcol2 = st.columns(2)
    with qcol1:
        if st.button("👁 预览", use_container_width=True, disabled=not has_jrxml):
            with st.spinner("正在准备预览..."):
                run_agent("预览报表")
            st.rerun()
    with qcol2:
        if st.button("↩ 撤销", use_container_width=True, disabled=not has_history):
            with st.spinner("正在撤销..."):
                run_agent("撤销上一步修改")
            st.rerun()

    if st.button("🔄 重置会话", use_container_width=True):
        with st.spinner("正在重置..."):
            run_agent("重新来，清空当前报表")
        st.rerun()

    st.divider()
    st.markdown("### 上传文件")
    st.caption("支持图片 (OCR)、PDF、Word、文本文件。内容将附加到您的下一条消息中。")

    if "uploaded_files" not in st.session_state:
        st.session_state.uploaded_files = []  # [{name, text, type}]

    uploaded = st.file_uploader(
        "选择文件",
        type=["png", "jpg", "jpeg", "bmp", "webp", "pdf", "docx", "txt", "csv", "json", "xml"],
        accept_multiple_files=True,
        key="file_uploader",
        label_visibility="collapsed",
    )

    if uploaded:
        for uf in uploaded:
            # 去重
            if any(f["name"] == uf.name for f in st.session_state.uploaded_files):
                continue
            import tempfile
            from backend.file_parser import parse_file
            from backend.layout_analyzer import analyze_layout

            suffix = Path(uf.name).suffix.lower()
            with tempfile.NamedTemporaryFile(suffix=suffix, delete=False) as tmp:
                tmp.write(uf.getvalue())
                tmp_path = tmp.name

            result = parse_file(tmp_path, suffix)

            # 对图片/PDF 进行 A4 模板布局分析
            parsed_text = result["text"]
            parsed_type = result["file_type"]
            if suffix in (".png", ".jpg", ".jpeg", ".bmp", ".webp", ".pdf"):
                layout = analyze_layout(tmp_path)
                tt = layout.get("template_type", "unknown")
                current_jrxml = st.session_state.agent_state.get("current_jrxml", "")

                if tt == "full_a4":
                    parsed_text = layout["description"]
                    parsed_type = "a4_template"
                elif tt == "partial_rows":
                    parsed_type = "a4_partial"
                    if current_jrxml.strip():
                        # 修改模式：尝试行匹配
                        from backend.layout_analyzer import match_rows_to_jrxml
                        match = match_rows_to_jrxml(layout, current_jrxml)
                        parsed_text = (
                            f"[行片段修改] 上传图片包含 {layout['total_rows']} 行，"
                            f"视为 A4 报表的一部分。\n\n"
                            f"{match['description']}\n\n"
                            f"--- 行结构 ---\n{layout['description']}"
                        )
                    else:
                        # 新建模式：按 A4 模板处理
                        parsed_text = layout["description"]

            Path(tmp_path).unlink(missing_ok=True)

            if parsed_text:
                st.session_state.uploaded_files.append({
                    "name": uf.name,
                    "text": parsed_text,
                    "type": parsed_type,
                })

    if st.session_state.uploaded_files:
        for i, f in enumerate(st.session_state.uploaded_files):
            cols = st.columns([5, 1])
            with cols[0]:
                st.caption(f"📎 {f['name']} ({f['type']}, {len(f['text'])} 字符)")
            with cols[1]:
                if st.button("✕", key=f"rm_uf_{i}", help="移除"):
                    st.session_state.uploaded_files.pop(i)
                    st.rerun()

    st.divider()
    st.markdown("### 配置")
    llm_backend = os.getenv("LLM_BACKEND", "cloud")
    llm_model = os.getenv("LLM_MODEL", os.getenv("LOCAL_LLM_MODEL", "gpt-4o"))
    st.caption(f"大语言模型: {llm_backend} / {llm_model}")
    st.caption(f"最大重试次数: {os.getenv('MAX_RETRY', '3')}")
    st.caption(f"验证服务: {os.getenv('VALIDATION_SERVICE_URL', 'http://localhost:8001/validate')}")

    st.divider()
    st.markdown("### 下载")

    final = st.session_state.agent_state.get("final_jrxml", "")
    versions = st.session_state.agent_state.get("jrxml_versions", [])

    if final:
        st.download_button(
            label="📥 下载最新 JRXML",
            data=final,
            file_name="report.jrxml",
            mime="application/xml",
            use_container_width=True,
        )

    if versions:
        with st.expander("📋 历史版本", expanded=False):
            for i, v in enumerate(reversed(versions)):
                ts = v.get("ts", "")[:16]
                label = v.get("label", "版本")
                status = v.get("status", "")
                icon = "✅" if status == "pass" else "❌"
                dl_label = f"{icon} v{len(versions)-i} — {label} ({ts})"
                st.download_button(
                    label=dl_label,
                    data=v.get("jrxml", ""),
                    file_name=f"report_v{len(versions)-i}.jrxml",
                    mime="application/xml",
                    use_container_width=True,
                    key=f"dl_v{i}",
                )

# ---- 标题 ----
st.title("📝 JRXML 报表生成器")
st.caption("用自然语言描述您的报表需求，我将逐步生成可用的 JRXML 模板。")

# ---- 聊天历史 ----
for msg in st.session_state.messages:
    with st.chat_message(msg["role"]):
        if msg.get("type") == "jrxml":
            with st.expander("查看生成的 JRXML", expanded=False):
                st.code(msg["content"], language="xml")
        elif msg.get("type") == "error_explanation":
            st.warning(msg["content"])
        elif msg.get("type") == "success":
            st.success(msg["content"])
        elif msg.get("type") == "consult":
            st.info(msg["content"])
        else:
            st.markdown(msg["content"])

# ---- 聊天输入 ----
if prompt := st.chat_input("描述您的报表需求..."):
    # 拼接上传文件的文本
    uploaded_texts = []
    if st.session_state.get("uploaded_files"):
        for f in st.session_state.uploaded_files:
            uploaded_texts.append(f"[上传文件: {f['name']}]\n{f['text']}")
    if uploaded_texts:
        full_prompt = "\n\n".join(uploaded_texts) + "\n\n---\n用户需求:\n" + prompt
        st.session_state.uploaded_files = []  # 用后即清
    else:
        full_prompt = prompt

    st.session_state.messages.append({"role": "user", "content": prompt})
    with st.chat_message("user"):
        st.markdown(prompt)
    run_agent(full_prompt)
    st.rerun()