import streamlit as st

from apis import generate_sql, generate_chart
from utils import format_sql


def main():
    st.title("📊 Wren AI Cloud API Demo - Chart Generation")

    if "api_key" not in st.session_state or "project_id" not in st.session_state:
        st.error("Please enter your API Key and Project ID in the sidebar of Home page to get started.")
        return
    if not st.session_state.api_key or not st.session_state.project_id:
        st.error("Please enter your API Key and Project ID in the sidebar of Home page to get started.")
        return
    
    api_key = st.session_state.api_key
    project_id = st.session_state.project_id

    st.markdown('Using APIs: [SQL Generation](https://wrenai.readme.io/reference/cloud_post_generate-sql), [Chart Generation](https://wrenai.readme.io/reference/cloud_post_generate-vega-chart)')

    # Sidebar for API configuration
    with st.sidebar:
        st.header("🔧 Configuration")
        sample_size = st.slider(
            "Chart Sample Size", 
            min_value=100, 
            max_value=10000, 
            value=1000,
            step=100,
            help="Number of data points to include in charts"
        )

    # Initialize chat history
    if "messages" not in st.session_state:
        st.session_state.messages = []
    if "thread_id" not in st.session_state:
        st.session_state.thread_id = ""

    # Display chat history
    for message in st.session_state.messages:
        with st.chat_message(message["role"]):
            if message["role"] == "user":
                st.write(message["content"])
            else:
                st.write(message["content"])
                if "sql" in message:
                    with st.expander("📝 Generated SQL Query", expanded=False):
                        st.code(format_sql(message["sql"]), language="sql")
                if "vega_spec" in message:
                    try:
                        with st.expander("📊 Chart Specification", expanded=False):
                            st.json(message["vega_spec"])
                        st.vega_lite_chart(message["vega_spec"])
                    except Exception as e:
                        st.toast(f"Error rendering chart: {e}", icon="🚨")

    # Chat input
    if prompt := st.chat_input("Ask a question about your data..."):
        # Add user message to chat history
        st.session_state.messages.append({"role": "user", "content": prompt})
        
        # Display user message
        with st.chat_message("user"):
            st.write(prompt)

        # Generate response
        with st.chat_message("assistant"):
            with st.spinner("Generating SQL query..."):
                sql_response, error = generate_sql(api_key, project_id, prompt, st.session_state.thread_id)
            
            if sql_response:
                sql_query = sql_response.get("sql", "")
                st.session_state.thread_id = sql_response.get("threadId", "")
                
                if sql_query:
                    st.toast("SQL query generated successfully!", icon="🎉")
                    
                    # Store the response
                    assistant_message = {
                        "role": "assistant",
                        "content": f"I've generated a SQL query for your question: '{prompt}'",
                        "sql": sql_query
                    }
                    st.session_state.messages.append(assistant_message)
                    st.write(assistant_message["content"])

                    # Display SQL query
                    with st.expander("📝 Generated SQL Query", expanded=False):
                        st.code(format_sql(sql_query), language="sql")
                    
                    # Generate chart
                    with st.spinner("Generating chart..."):
                        chart_response, error = generate_chart(
                            api_key,
                            project_id,
                            prompt,
                            sql_query,
                            thread_id=st.session_state.thread_id,
                            sample_size=sample_size,
                        )
                    
                    if chart_response:
                        vega_spec = chart_response.get("vegaSpec", {})
                        if vega_spec:
                            st.toast("Chart generated successfully!", icon="🎉")
                        
                            assistant_message = {
                                "role": "assistant",
                                "content": f"I've generated a Chart for your question: '{prompt}'",
                                "vega_spec": vega_spec
                            }
                            st.session_state.messages.append(assistant_message)
                            st.write(assistant_message["content"])

                            # Display chart
                            try:
                                # Show chart specification in expander
                                with st.expander("📊 Chart Specification", expanded=False):
                                    st.json(vega_spec)
                                st.vega_lite_chart(vega_spec)
                            except Exception as e:
                                st.toast(f"Error rendering chart: {e}", icon="🚨")
                        else:
                            st.toast("Failed to generate chart. Please check your query and try again.", icon="🚨")
                    else:
                        st.toast(f"Failed to generate chart. Please check your query and try again.: {error}", icon="🚨")
                else:
                    st.toast("No SQL query was generated. Please try rephrasing your question.", icon="🚨")
                    assistant_message = {
                        "role": "assistant",
                        "content": "I couldn't generate a SQL query for your question. Please try rephrasing it or make sure it's related to your data."
                    }
                    st.session_state.messages.append(assistant_message)
            else:
                st.toast(f"Error generating SQL: {error}", icon="🚨")
                assistant_message = {
                    "role": "assistant", 
                    "content": "Sorry, I couldn't process your request. Please check your API credentials and try again."
                }
                st.session_state.messages.append(assistant_message)

    # Clear chat button
    if st.sidebar.button("🗑️ Clear Chat History"):
        st.session_state.messages = []
        st.session_state.thread_id = ""
        st.rerun()


if __name__ == "__main__":
    main()