import streamlit as st
import requests
import pandas as pd
import re
import json
import configparser
from datetime import datetime
from torch import cuda

# Import existing modules from appStore
from appStore.prep_data import process_giz_worldwide, remove_duplicates, get_max_end_year, extract_year
from appStore.prep_utils import create_documents, get_client
from appStore.embed import hybrid_embed_chunks
from appStore.search import hybrid_search
from appStore.region_utils import (
    load_region_data, 
    clean_country_code, 
    get_country_name, 
    get_regions, 
    get_country_name_and_region_mapping  
)
# TF-IDF part (excluded from the app for now)
# from appStore.tfidf_extraction import extract_top_keywords

# Import helper modules
from appStore.rag_utils import (
    highlight_query,
    get_rag_answer,
    compute_title
)
from appStore.filter_utils import (
    parse_budget,
    filter_results,
    get_crs_options
)

from appStore.crs_utils import lookup_crs_value


###########################################
# Model Config
###########################################

# Initialize the parser and read the configuration file
config = configparser.ConfigParser()
config.read('model_params.cfg')

# Retrieve model parameters from the "MODEL" section
DEDICATED_MODEL = config.get('MODEL', 'DEDICATED_MODEL')
DEDICATED_ENDPOINT = config.get('MODEL', 'DEDICATED_ENDPOINT')
WRITE_ACCESS_TOKEN = config.get('MODEL', 'WRITE_ACCESS_TOKEN')

st.set_page_config(page_title="SEARCH IATI", layout='wide')

###########################################
# Cache the project data
###########################################
@st.cache_data
def load_project_data():
    """
    Load and process the GIZ worldwide data, returning a pandas DataFrame.
    """
    return process_giz_worldwide()

project_data = load_project_data()

# Determine min and max budgets in million euros
budget_series = pd.to_numeric(project_data['total_project'], errors='coerce').dropna()
min_budget_val = float(budget_series.min() / 1e6)
max_budget_val = float(budget_series.max() / 1e6)

###########################################
# Prepare region data
###########################################
region_lookup_path = "docStore/regions_lookup.csv"
region_df = load_region_data(region_lookup_path)

###########################################
# Get device
###########################################
device = 'cuda' if cuda.is_available() else 'cpu'

###########################################
# Streamlit App Layout
###########################################
col_title, col_about = st.columns([8, 2])
with col_title:
    st.markdown("<h1 style='text-align:center;'>GIZ Project Search (PROTOTYPE)</h1>", unsafe_allow_html=True)
with col_about:
    with st.expander("ℹ️ About"):
        st.markdown(
            """
            This app is a prototype for testing purposes using publicly available project data 
            from the German International Cooperation Society (GIZ) as of 23rd February 2025.  
            **Please do NOT enter sensitive or personal information.**  
            **Note**: The answers are AI-generated and may be wrong or misleading.
            """, unsafe_allow_html=True
        )

# Main query input
var = st.text_input("Enter Question")

###########################################
# Create or load the embeddings collection
###########################################
collection_name = "giz_worldwide"
client = get_client()
print(client.get_collections())

# If needed, once only:
# chunks = process_giz_worldwide()
# temp_doc = create_documents(chunks, 'chunks')
# hybrid_embed_chunks(docs=temp_doc, collection_name=collection_name, del_if_exists=True)

max_end_year = get_max_end_year(client, collection_name)
_, unique_sub_regions = get_regions(region_df)

# Build country->code and code->region mapping
country_name_mapping, iso_code_to_sub_region = get_country_name_and_region_mapping(
    client, 
    collection_name, 
    region_df,
    hybrid_search, 
    clean_country_code, 
    get_country_name
)
unique_country_names = sorted(country_name_mapping.keys())

###########################################
# Filter Controls
###########################################
col1, col2, col3, col4, col5 = st.columns([1, 1, 1, 1, 1])

with col1:
    region_filter = st.selectbox("Region", ["All/Not allocated"] + sorted(unique_sub_regions))

if region_filter == "All/Not allocated":
    filtered_country_names = unique_country_names
else:
    filtered_country_names = [
        name for name, code in country_name_mapping.items() 
        if iso_code_to_sub_region.get(code) == region_filter
    ]

with col2:
    country_filter = st.selectbox("Country", ["All/Not allocated"] + filtered_country_names)

with col3:
    current_year = datetime.now().year
    default_start_year = current_year - 4
    end_year_range = st.slider(
        "Project End Year", 
        min_value=2010, 
        max_value=max_end_year, 
        value=(default_start_year, max_end_year)
    )

with col4:
    crs_options = ["All/Not allocated"] + get_crs_options(client, collection_name)
    crs_filter = st.selectbox("CRS", crs_options)

with col5:
    min_budget = st.slider(
        "Minimum Project Budget (Million €)",
        min_value=min_budget_val,
        max_value=max_budget_val,
        value=min_budget_val
    )

show_exact_matches = st.checkbox("Show only exact matches", value=False)

###########################################
# Main Search / Results
###########################################
if not var.strip():
    st.info("Please enter a question to see results.")
else:
    # 1) Perform hybrid search
    results = hybrid_search(client, var, collection_name, limit=500)
    semantic_all, lexical_all = results[0], results[1]

    # Filter out short pages
    semantic_all = [r for r in semantic_all if len(r.payload["page_content"]) >= 5]
    lexical_all = [r for r in lexical_all if len(r.payload["page_content"]) >= 5]

    # Apply threshold to semantic results if desired
    semantic_thresholded = [r for r in semantic_all if r.score >= 0.0]

    # 2) Filter results based on the user’s selections
    filtered_semantic = filter_results(
        semantic_thresholded, 
        country_filter, 
        region_filter, 
        end_year_range, 
        crs_filter, 
        min_budget,
        region_df, 
        iso_code_to_sub_region,
        clean_country_code,
        get_country_name
    )
    filtered_lexical = filter_results(
        lexical_all, 
        country_filter, 
        region_filter, 
        end_year_range, 
        crs_filter, 
        min_budget,
        region_df, 
        iso_code_to_sub_region,
        clean_country_code,
        get_country_name
    )

    # Remove duplicates
    filtered_semantic_no_dupe = remove_duplicates(filtered_semantic)
    filtered_lexical_no_dupe = remove_duplicates(filtered_lexical)

    def format_currency(value):
        """
        Format a numeric or string value as currency (EUR) with commas.
        """
        try:
            return f"€{int(float(value)):,}"
        except (ValueError, TypeError):
            return value

    # 3) Display results
    if show_exact_matches:
        # Lexical substring match only
        st.write("Showing **Top 15 Lexical Search results**")
        query_substring = var.strip().lower()
        lexical_substring_filtered = [
            r for r in lexical_all 
            if query_substring in r.payload["page_content"].lower()
        ]
        filtered_lexical = filter_results(
            lexical_substring_filtered, 
            country_filter, 
            region_filter, 
            end_year_range, 
            crs_filter, 
            min_budget,
            region_df, 
            iso_code_to_sub_region,
            clean_country_code,
            get_country_name
        )
        filtered_lexical_no_dupe = remove_duplicates(filtered_lexical)
        if not filtered_lexical_no_dupe:
            st.write('No exact matches, consider unchecking "Show only exact matches"')
        else:
            top_results = filtered_lexical_no_dupe[:10]
            # RAG answer
            rag_answer = get_rag_answer(var, top_results, DEDICATED_ENDPOINT, WRITE_ACCESS_TOKEN)
            st.markdown(f"<h3 style='text-align:center; font-size:1.2em; font-style: italic;'>{var}</h3>", unsafe_allow_html=True)
            st.write(rag_answer)
            st.divider()

            # Show each result
            for res in top_results:
                metadata = res.payload.get('metadata', {})
                if "title" not in metadata:
                    metadata["title"] = compute_title(metadata)
                
                # Title
                title_html = highlight_query(metadata["title"], var) if var.strip() else metadata["title"]
                st.markdown(f"#### {title_html}", unsafe_allow_html=True)

                # Description snippet
                objective = metadata.get("objective", "None")
                desc_en = metadata.get("description.en", "").strip()
                desc_de = metadata.get("description.de", "").strip()
                description = desc_en if desc_en else desc_de
                if not description:
                    description = "No project description available"
                words = description.split()
                preview_word_count = 90
                preview_text = " ".join(words[:preview_word_count])
                remainder_text = " ".join(words[preview_word_count:])

                col_left, col_right = st.columns(2)
                with col_left:
                    st.markdown(highlight_query(preview_text, var), unsafe_allow_html=True)
                    if remainder_text:
                        with st.expander("Show more"):
                            st.markdown(highlight_query(remainder_text, var), unsafe_allow_html=True)

                with col_right:
                    start_year_str = extract_year(metadata.get('start_year', None)) or "Unknown"
                    end_year_str = extract_year(metadata.get('end_year', None)) or "Unknown"
                    total_project = metadata.get('total_project', "Unknown")
                    total_volume = metadata.get('total_volume', "Unknown")
                    formatted_project_budget = format_currency(total_project)
                    formatted_total_volume = format_currency(total_volume)
                    country_raw = metadata.get('country', "Unknown")
                    crs_key = metadata.get("crs_key", "").strip()
                    crs_key_clean = re.sub(r'\.0$', '', str(crs_key))
                    new_crs_value = lookup_crs_value(crs_key_clean)
                    new_crs_value_clean = re.sub(r'\.0$', '', str(new_crs_value))
                    crs_combined = f"{crs_key_clean}: {new_crs_value_clean}" if crs_key_clean else "Unknown"

                    # Additional text
                    additional_text = (
                        f"**Objective:** {highlight_query(objective, var)}<br>"
                        f"**Commissioned by:** {metadata.get('client', 'Unknown Client')}<br>"
                        f"**Projekt duration:** {start_year_str}-{end_year_str}<br>"
                        f"**Budget:** Project: {formatted_project_budget}, Total volume: {formatted_total_volume}<br>"
                        f"**Country:** {country_raw}<br>"
                        f"**Sector:** {crs_combined}"
                    )
                    contact = metadata.get("contact", "").strip()
                    if contact and contact.lower() != "transparenz@giz.de":
                        additional_text += f"<br>**Contact:** xxx@giz.de"

                    st.markdown(additional_text, unsafe_allow_html=True)

                st.divider()

    else:
        # Semantic results
        if not filtered_semantic_no_dupe:
            st.write("No relevant results found.")
        else:
            top_results = filtered_semantic_no_dupe[:10]
            rag_answer = get_rag_answer(var, top_results, DEDICATED_ENDPOINT, WRITE_ACCESS_TOKEN)
            st.markdown(f"<h2 style='text-align:center; font-size:2.5em;'>{var}</h2>", unsafe_allow_html=True)
            st.write(rag_answer)
            st.divider()
            st.write("Showing **Top 15 Semantic Search results**")

            for res in top_results:
                metadata = res.payload.get('metadata', {})
                if "title" not in metadata:
                    metadata["title"] = compute_title(metadata)
                
                st.markdown(f"#### {metadata['title']}")

                desc_en = metadata.get("description.en", "").strip()
                desc_de = metadata.get("description.de", "").strip()
                description = desc_en if desc_en else desc_de
                if not description:
                    description = "No project description available"
                
                words = description.split()
                preview_word_count = 90
                preview_text = " ".join(words[:preview_word_count])
                remainder_text = " ".join(words[preview_word_count:])

                col_left, col_right = st.columns(2)
                with col_left:
                    st.markdown(highlight_query(preview_text, var), unsafe_allow_html=True)
                    if remainder_text:
                        with st.expander("Show more"):
                            st.markdown(highlight_query(remainder_text, var), unsafe_allow_html=True)

                with col_right:
                    start_year_str = extract_year(metadata.get('start_year', None)) or "Unknown"
                    end_year_str = extract_year(metadata.get('end_year', None)) or "Unknown"
                    total_project = metadata.get('total_project', "Unknown")
                    total_volume = metadata.get('total_volume', "Unknown")
                    formatted_project_budget = format_currency(total_project)
                    formatted_total_volume = format_currency(total_volume)
                    country_raw = metadata.get('country', "Unknown")
                    crs_key = metadata.get("crs_key", "").strip()
                    crs_key_clean = re.sub(r'\.0$', '', str(crs_key))
                    new_crs_value = lookup_crs_value(crs_key_clean)
                    new_crs_value_clean = re.sub(r'\.0$', '', str(new_crs_value))
                    crs_combined = f"{crs_key_clean}: {new_crs_value_clean}" if crs_key_clean else "Unknown"

                    additional_text = (
                        f"**Objective:** {metadata.get('objective', '')}<br>"
                        f"**Commissioned by:** {metadata.get('client', 'Unknown Client')}<br>"
                        f"**Projekt duration:** {start_year_str}-{end_year_str}<br>"
                        f"**Budget:** Project: {formatted_project_budget}, Total volume: {formatted_total_volume}<br>"
                        f"**Country:** {country_raw}<br>"
                        f"**Sector:** {crs_combined}"
                    )
                    contact = metadata.get("contact", "").strip()
                    if contact and contact.lower() != "transparenz@giz.de":
                        additional_text += f"<br>**Contact:** xxx@giz.de"

                    st.markdown(additional_text, unsafe_allow_html=True)

                st.divider()