import streamlit as st
import requests
import uuid
import os
import json
import re
import yaml
from datetime import datetime
from pathlib import Path
from dotenv import load_dotenv

# --- CONFIGURATION ---
load_dotenv()
API_BASE_URL = os.getenv("MINDNET_API_URL", "http://localhost:8002")
CHAT_ENDPOINT = f"{API_BASE_URL}/chat"
FEEDBACK_ENDPOINT = f"{API_BASE_URL}/feedback"
HISTORY_FILE = Path("data/logs/search_history.jsonl")

# Timeout Strategy
timeout_setting = os.getenv("MINDNET_API_TIMEOUT") or os.getenv("MINDNET_LLM_TIMEOUT")
API_TIMEOUT = float(timeout_setting) if timeout_setting else 300.0

# --- PAGE SETUP ---
st.set_page_config(page_title="mindnet v2.3.2", page_icon="🧠", layout="wide")

# --- CSS STYLING ---
st.markdown("""
<style>
    .block-container { padding-top: 2rem; max_width: 1000px; margin: auto; }
    
    .intent-badge {
        background-color: #e8f0fe; color: #1a73e8;
        padding: 4px 10px; border-radius: 12px;
        font-size: 0.8rem; font-weight: 600;
        border: 1px solid #d2e3fc; display: inline-block; margin-bottom: 0.5rem;
    }
    
    /* Editor Box Styling */
    .draft-box {
        border: 1px solid #d0d7de;
        border-radius: 6px;
        padding: 16px;
        background-color: #f6f8fa;
        margin-top: 10px;
        margin-bottom: 10px;
    }
    
    /* Preview Styling mimics GitHub Markdown */
    .preview-box {
        border: 1px solid #e0e0e0;
        border-radius: 6px;
        padding: 24px;
        background-color: white;
        font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
    }
</style>
""", unsafe_allow_html=True)

# --- SESSION STATE ---
if "messages" not in st.session_state: st.session_state.messages = []
if "user_id" not in st.session_state: st.session_state.user_id = str(uuid.uuid4())

# --- HELPER FUNCTIONS ---

def parse_markdown_draft(full_text):
    """
    Zerlegt die LLM-Antwort in Frontmatter (Dict) und Body (String).
    Robust gegen Einleitungstexte vor dem Codeblock.
    """
    # 1. Extrahiere Codeblock
    pattern_block = r"```markdown\s*(.*?)\s*```"
    match_block = re.search(pattern_block, full_text, re.DOTALL)
    
    # Fallback: Wenn kein Codeblock, nimm ganzen Text
    clean_text = match_block.group(1).strip() if match_block else full_text

    # 2. Trenne Frontmatter (YAML) vom Body
    # Sucht nach --- am Anfang, gefolgt von YAML, gefolgt von ---
    pattern_fm = r"^---\s+(.*?)\s+---\s*(.*)$"
    match_fm = re.search(pattern_fm, clean_text, re.DOTALL)
    
    if match_fm:
        yaml_str = match_fm.group(1)
        body = match_fm.group(2)
        try:
            meta = yaml.safe_load(yaml_str) or {}
        except Exception:
            meta = {} # Fallback bei kaputtem YAML
        return meta, body
    else:
        # Kein Frontmatter gefunden -> Alles ist Body
        return {}, clean_text

def generate_filename(meta):
    """Generiert einen Dateinamen basierend auf Typ und Datum."""
    date_str = datetime.now().strftime("%Y%m%d")
    n_type = meta.get("type", "note")
    # Versuche Titel aus Body zu raten wäre zu komplex, wir nehmen Generic
    return f"{date_str}-{n_type}-draft.md"

def build_markdown_doc(meta, body):
    """Baut das finale Dokument zusammen."""
    # ID Generierung beim 'Speichern' (hier simuliert für Download)
    if "id" not in meta or meta["id"] == "generated_on_save":
        meta["id"] = f"{datetime.now().strftime('%Y%m%d')}-{meta.get('type', 'note')}-{uuid.uuid4().hex[:6]}"
    
    # Updated timestamp
    meta["updated"] = datetime.now().strftime("%Y-%m-%d")
    
    yaml_str = yaml.dump(meta, default_flow_style=None, sort_keys=False, allow_unicode=True).strip()
    return f"---\n{yaml_str}\n---\n\n{body}"

def load_history_from_logs(limit=10):
    queries = []
    if HISTORY_FILE.exists():
        try:
            with open(HISTORY_FILE, "r", encoding="utf-8") as f:
                lines = f.readlines()
                for line in reversed(lines):
                    try:
                        entry = json.loads(line)
                        q = entry.get("query_text")
                        if q and q not in queries:
                            queries.append(q)
                        if len(queries) >= limit: break
                    except: continue
        except: pass
    return queries

def send_chat_message(message: str, top_k: int, explain: bool):
    try:
        response = requests.post(
            CHAT_ENDPOINT, 
            json={"message": message, "top_k": top_k, "explain": explain}, 
            timeout=API_TIMEOUT
        )
        response.raise_for_status()
        return response.json()
    except Exception as e:
        return {"error": str(e)}

def submit_feedback(query_id, node_id, score, comment=None):
    try:
        requests.post(FEEDBACK_ENDPOINT, json={"query_id": query_id, "node_id": node_id, "score": score, "comment": comment}, timeout=2)
        target = "Antwort" if node_id == "generated_answer" else "Quelle"
        st.toast(f"Feedback ({score}) gesendet!")
    except: pass

# --- UI COMPONENTS ---

def render_sidebar():
    with st.sidebar:
        st.title("🧠 mindnet")
        st.caption("v2.3.2 | WP-10 UI")
        
        mode = st.radio("Modus", ["💬 Chat", "📝 Manueller Editor"], index=0)
        
        st.divider()
        st.subheader("⚙️ Settings")
        top_k = st.slider("Quellen (Top-K)", 1, 10, 5)
        explain = st.toggle("Explanation Layer", True)
        
        st.divider()
        st.subheader("🕒 Verlauf")
        for q in load_history_from_logs(8):
            if st.button(f"🔎 {q[:25]}...", key=f"hist_{q}", use_container_width=True):
                st.session_state.messages.append({"role": "user", "content": q})
                st.rerun()
    return mode, top_k, explain

def render_draft_editor(msg):
    """
    Rendert den Split-Screen Editor für INTERVIEW Drafts.
    """
    qid = msg.get('query_id', str(uuid.uuid4()))
    key_base = f"draft_{qid}"
    
    # 1. State Initialisierung (Nur einmal pro Nachricht)
    if f"{key_base}_init" not in st.session_state:
        meta, body = parse_markdown_draft(msg["content"])
        st.session_state[f"{key_base}_type"] = meta.get("type", "default")
        
        # Tags Behandlung (Liste oder String)
        tags_raw = meta.get("tags", [])
        if isinstance(tags_raw, list):
            st.session_state[f"{key_base}_tags"] = ", ".join(tags_raw)
        else:
            st.session_state[f"{key_base}_tags"] = str(tags_raw)
            
        st.session_state[f"{key_base}_body"] = body.strip()
        st.session_state[f"{key_base}_init"] = True

    # 2. Editor Container
    st.markdown(f'<div class="draft-box">', unsafe_allow_html=True)
    st.markdown("### 📝 Entwurf bearbeiten")
    st.caption("Das System hat diesen Entwurf vorbereitet. Ergänze die fehlenden [TODO] Bereiche.")

    # 3. Metadaten (Grid Layout)
    c1, c2 = st.columns([1, 2])
    with c1:
        # Typen müssen mit types.yaml synchron sein
        known_types = ["concept", "project", "decision", "experience", "journal", "person", "value", "goal", "principle"]
        curr_type = st.session_state[f"{key_base}_type"]
        if curr_type not in known_types: known_types.append(curr_type)
        
        new_type = st.selectbox("Typ", known_types, index=known_types.index(curr_type), key=f"{key_base}_sel_type")
        
    with c2:
        new_tags = st.text_input("Tags (kommagetrennt)", value=st.session_state[f"{key_base}_tags"], key=f"{key_base}_inp_tags")

    # 4. Inhalt (Tabs)
    tab_edit, tab_view = st.tabs(["✏️ Editor", "👁️ Vorschau"])
    
    with tab_edit:
        # Hier landet der Body mit den ## Headings und [TODO]s
        new_body = st.text_area(
            "Inhalt", 
            value=st.session_state[f"{key_base}_body"], 
            height=500, 
            key=f"{key_base}_txt_body",
            label_visibility="collapsed",
            help="Hier kannst du Markdown schreiben."
        )
    
    # Live-Zusammenbau für Vorschau & Download
    final_tags_list = [t.strip() for t in new_tags.split(",") if t.strip()]
    final_meta = {
        "id": "generated_on_save", # Placeholder, wird beim Download ersetzt
        "type": new_type,
        "status": "draft",
        "tags": final_tags_list
    }
    final_doc = build_markdown_doc(final_meta, new_body)
    
    with tab_view:
        st.markdown('<div class="preview-box">', unsafe_allow_html=True)
        st.markdown(final_doc) # Rendered Markdown
        st.markdown('</div>', unsafe_allow_html=True)

    st.markdown("---")
    
    # 5. Actions (Writeback Simulation)
    b1, b2 = st.columns([1, 1])
    with b1:
        # Download Button (Client-Side)
        st.download_button(
            label="💾 Als .md Datei speichern",
            data=final_doc,
            file_name=generate_filename(final_meta),
            mime="text/markdown"
        )
    with b2:
        # Copy Button Logic
        if st.button("📋 Code anzeigen (Copy)", key=f"{key_base}_btn_copy"):
            st.code(final_doc, language="markdown")
            
    st.markdown("</div>", unsafe_allow_html=True)


def render_chat_interface(top_k, explain):
    for msg in st.session_state.messages:
        with st.chat_message(msg["role"]):
            if msg["role"] == "assistant":
                # Intent Badge
                if "intent" in msg:
                    intent = msg["intent"]
                    icon = {"EMPATHY": "❤️", "DECISION": "⚖️", "CODING": "💻", "FACT": "📚", "INTERVIEW": "📝"}.get(intent, "🧠")
                    src = msg.get("intent_source", "?")
                    st.markdown(f'<div class="intent-badge">{icon} Intent: {intent} <span style="opacity:0.6; font-size:0.8em">({src})</span></div>', unsafe_allow_html=True)
                
                # INTERVIEW Logic vs NORMAL Chat
                if msg.get("intent") == "INTERVIEW":
                    render_draft_editor(msg)
                else:
                    st.markdown(msg["content"])
                
                # Sources & Feedback (nur bei RAG sinnvoll)
                if "sources" in msg and msg["sources"]:
                    for hit in msg["sources"]:
                        score = hit.get('total_score', 0)
                        icon = "🟢" if score > 0.8 else "🟡" if score > 0.5 else "⚪"
                        with st.expander(f"{icon} {hit.get('note_id', '?')} ({score:.2f})"):
                            st.markdown(f"_{hit.get('source', {}).get('text', '')[:300]}..._")
                            if hit.get('explanation'):
                                st.caption(f"Grund: {hit['explanation']['reasons'][0]['message']}")
                            
                            def _cb(qid=msg["query_id"], nid=hit['node_id']):
                                val = st.session_state.get(f"fb_src_{qid}_{nid}")
                                if val is not None: submit_feedback(qid, nid, val+1)
                            st.feedback("faces", key=f"fb_src_{msg['query_id']}_{hit['node_id']}", on_change=_cb)
                
                if "query_id" in msg:
                    qid = msg["query_id"]
                    st.feedback("stars", key=f"fb_glob_{qid}", on_change=lambda: submit_feedback(qid, "generated_answer", st.session_state[f"fb_glob_{qid}"]+1))
            else:
                st.markdown(msg["content"])

    # Input Loop
    if prompt := st.chat_input("Frage Mindnet... (z.B. 'Neues Projekt anlegen')"):
        st.session_state.messages.append({"role": "user", "content": prompt})
        st.rerun()
        
    last_msg_is_user = len(st.session_state.messages) > 0 and st.session_state.messages[-1]["role"] == "user"
    if last_msg_is_user:
        with st.chat_message("assistant"):
            with st.spinner("Thinking..."):
                resp = send_chat_message(st.session_state.messages[-1]["content"], top_k, explain)
            
            if "error" in resp:
                st.error(resp["error"])
            else:
                st.session_state.messages.append({
                    "role": "assistant",
                    "content": resp.get("answer"),
                    "intent": resp.get("intent", "FACT"),
                    "intent_source": resp.get("intent_source", "Unknown"),
                    "sources": resp.get("sources", []),
                    "query_id": resp.get("query_id")
                })
                st.rerun()

def render_manual_editor():
    st.header("📝 Manueller Editor")
    st.info("Hier kannst du eine Notiz komplett von Null erstellen.")
    
    # Wiederverwendung der Editor-Logik wäre ideal, hier vereinfacht:
    c1, c2 = st.columns([1, 2])
    n_type = c1.selectbox("Typ", ["concept", "project", "decision", "experience", "value", "goal"])
    tags = c2.text_input("Tags")
    body = st.text_area("Inhalt", height=400, placeholder="# Titel\n\nText...")
    
    if st.button("Generieren & Download"):
        meta = {"type": n_type, "status": "draft", "tags": [t.strip() for t in tags.split(",")]}
        doc = build_markdown_doc(meta, body)
        st.code(doc, language="markdown")

# --- MAIN ---
mode, top_k, explain = render_sidebar()
if mode == "💬 Chat":
    render_chat_interface(top_k, explain)
else:
    render_manual_editor()