from schemas import (
    FetchEmailsParams,
    ShowEmailParams,
    AnalyzeEmailsParams,
    DraftReplyParams,
    SendReplyParams,
)
from typing import Any, Dict
from email_scraper import scrape_emails_by_text_search, _load_email_db, _save_email_db, _is_date_in_range
from datetime import datetime, timedelta
from typing import List
from openai import OpenAI
import json
from dotenv import load_dotenv
import os

# Load environment variables from .env file
load_dotenv()

# Initialize OpenAI client
OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
client = OpenAI(api_key=OPENAI_API_KEY)


def extract_query_info(query: str) -> Dict[str, str]:
    """
    Use an LLM to extract sender information and date range from a user query.
    Returns {"sender_keyword": "company/sender name", "start_date":"DD-MMM-YYYY","end_date":"DD-MMM-YYYY"}.
    """
    today_str = datetime.today().strftime("%d-%b-%Y")
    five_days_ago = (datetime.today() - timedelta(days=5)).strftime("%d-%b-%Y")
    
    system_prompt = f"""
You are a query parser for email search. Today is {today_str}.

Given a user query, extract the sender/company keyword and date range. Return _only_ valid JSON with:
{{
  "sender_keyword": "keyword or company name to search for",
  "start_date": "DD-MMM-YYYY", 
  "end_date": "DD-MMM-YYYY"
}}

Rules:
1. Extract sender keywords from phrases like "from swiggy", "swiggy emails", "mails from amazon", etc.
2. If no time is mentioned, use last 5 days: {five_days_ago} to {today_str}
3. Interpret relative dates as:
   - "today" → {today_str} to {today_str}
   - "yesterday" → 1 day ago to 1 day ago  
   - "last week" → 7 days ago to {today_str}
   - "last month" → 30 days ago to {today_str}
   - "last N days" → N days ago to {today_str}

Examples:
- "show me mails for last week from swiggy" 
  → {{"sender_keyword": "swiggy", "start_date": "01-Jun-2025", "end_date": "{today_str}"}}
- "emails from amazon yesterday"
  → {{"sender_keyword": "amazon", "start_date": "06-Jun-2025", "end_date": "06-Jun-2025"}}  
- "show flipkart emails"
  → {{"sender_keyword": "flipkart", "start_date": "{five_days_ago}", "end_date": "{today_str}"}}

Return _only_ the JSON object—no extra text.
"""

    messages = [
        {"role": "system", "content": system_prompt},
        {"role": "user", "content": query}
    ]
    resp = client.chat.completions.create(
        model="gpt-4o-mini",
        temperature=0.0,
        messages=messages
    )
    content = resp.choices[0].message.content.strip()

    # Try direct parse; if the model added fluff, strip to the JSON block.
    try:
        return json.loads(content)
    except json.JSONDecodeError:
        start = content.find("{")
        end = content.rfind("}") + 1
        return json.loads(content[start:end])


def fetch_emails(query: str) -> Dict:
    """
    Fetch emails based on a natural language query that contains sender information and date range.
    Now uses text-based search and returns only summary information, not full content.
    
    Args:
        query: The natural language query (e.g., "show me mails for last week from swiggy")
    
    Returns:
        Dict with query_info, email_summary, analysis, and email_count
    """
    # Extract sender keyword and date range from query
    query_info = extract_query_info(query)
    sender_keyword = query_info.get("sender_keyword", "")
    start_date = query_info.get("start_date")
    end_date = query_info.get("end_date")
    
    print(f"Searching for emails with keyword '{sender_keyword}' between {start_date} and {end_date}")
    
    # Use the new text-based search function
    full_emails = scrape_emails_by_text_search(sender_keyword, start_date, end_date)
    
    if not full_emails:
        return {
            "query_info": query_info,
            "email_summary": [],
            "analysis": {"summary": f"No emails found for '{sender_keyword}' in the specified date range.", "insights": []},
            "email_count": 0
        }
    
    # Create summary version without full content
    email_summary = []
    for email in full_emails:
        summary_email = {
            "date": email.get("date"),
            "time": email.get("time"),
            "subject": email.get("subject"),
            "from": email.get("from", "Unknown Sender"),
            "message_id": email.get("message_id")
            # Note: Removed 'content' to keep response clean
        }
        email_summary.append(summary_email)
    
    # Auto-analyze the emails for insights
    analysis = analyze_emails(full_emails)  # Use full emails for analysis but don't return them
    
    # Return summary info with analysis
    return {
        "query_info": query_info,
        "email_summary": email_summary,
        "analysis": analysis,
        "email_count": len(full_emails)
    }


def show_email(message_id: str) -> Dict:
    """
    Retrieve the full email record (date, time, subject, content, etc.)
    from the local cache by message_id.
    """
    db = _load_email_db()  # returns { sender_email: { "emails": [...], "last_scraped": ... }, ... }

    # Search each sender's email list
    for sender_data in db.values():
        for email in sender_data.get("emails", []):
            if email.get("message_id") == message_id:
                return email

    # If we didn't find it, raise or return an error structure
    raise ValueError(f"No email found with message_id '{message_id}'")


def draft_reply(email: Dict, tone: str) -> str:
    # call LLM to generate reply
    # return a dummy reply for now
    print(f"Drafting reply for email {email['id']} with tone: {tone}")
    return f"Drafted reply for email {email['id']} with tone {tone}."
    ...


def send_reply(message_id: str, reply_body: str) -> Dict:
    # SMTP / Gmail API send
    print(f"Sending reply to message {message_id} with body: {reply_body}")
    ...


def analyze_emails(emails: List[Dict]) -> Dict:
    """
    Summarize and extract insights from a list of emails.
    Returns a dict with this schema:
      {
        "summary": str,        # a concise overview of all emails
        "insights": [str, ...] # list of key observations or stats
      }
    """
    if not emails:
        return {"summary": "No emails to analyze.", "insights": []}
    
    # 1) Create a simplified email summary for analysis (without full content)
    simplified_emails = []
    for email in emails:
        simplified_email = {
            "date": email.get("date"),
            "time": email.get("time"), 
            "subject": email.get("subject"),
            "from": email.get("from", "Unknown Sender"),
            "content_preview": email.get("content", "")[:200] + "..." if email.get("content") else ""
        }
        simplified_emails.append(simplified_email)
    
    emails_payload = json.dumps(simplified_emails, ensure_ascii=False)

    # 2) Build the LLM prompt
    system_prompt = """
You are an expert email analyst. You will be given a JSON array of email objects,
each with keys: date, time, subject, from, content_preview.

Your job is to produce _only_ valid JSON with two fields:
1. summary: a 1–2 sentence high-level overview of these emails.
2. insights: a list of 3–5 bullet-style observations or statistics 
   (e.g. "5 emails from Swiggy", "mostly promotional content", "received over 3 days").

Focus on metadata like senders, subjects, dates, and patterns rather than detailed content analysis.

Output exactly:

{
  "summary": "...",
  "insights": ["...", "...", ...]
}
"""
    messages = [
        {"role": "system",  "content": system_prompt},
        {"role": "user",    "content": f"Here are the emails:\n{emails_payload}"}
    ]

    # 3) Call the LLM
    response = client.chat.completions.create(
        model="gpt-4o-mini",
        temperature=0.0,
        messages=messages
    )

    # 4) Parse and return
    content = response.choices[0].message.content.strip()
    try:
        return json.loads(content)
    except json.JSONDecodeError:
        # In case the model outputs extra text, extract the JSON block
        start = content.find('{')
        end = content.rfind('}') + 1
        return json.loads(content[start:end])


TOOL_MAPPING = {
    "fetch_emails": fetch_emails,
    "show_email": show_email,
    "analyze_emails": analyze_emails,
    "draft_reply": draft_reply,
    "send_reply": send_reply,
}