import streamlit as st
from PIL import Image
import os
import torch
from uuid import uuid4
import fitz
import json
from src.pipelines import InvoiceGenerator


st.set_page_config(page_title="Invoice generator", layout="wide")
output_folder = "output"
data_folder = "data"
template = "template.tex"
device = "cuda" if torch.cuda.is_available() else "cpu"
with open(f"{data_folder}/car_parts.json", "r") as f:
    car_parts = json.load(f)


if "pipeline" not in st.session_state:
    st.session_state.pipeline = InvoiceGenerator(
        fais_index_path=f"{data_folder}/invoice_index.faiss",
        image_invoice_index_path=f"{data_folder}/image_invoice.csv",
        path_to_invoices=f"{data_folder}/invoices",
        path_to_images=f"{data_folder}/images",
        reranker_model="monovlm",
        device=device,
        gpu_memory_utilization=0.65
    )
pipeline = st.session_state.pipeline


def get_image_from_pdf(pdf_path):
    doc = fitz.open(pdf_path)
    page = doc[0]
    mat = fitz.Matrix(2, 2)
    pix = page.get_pixmap(matrix=mat)
    img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
    return img


def display_invoice(image_path):
    output_pdf = "invoice_" + os.path.basename(image_path).split(".")[0] + ".pdf"
    path_to_output_pdf = f"{output_folder}/{output_pdf}"
    try:
        result = pipeline.generate_invoice(
            image_path=image_path, output_path=path_to_output_pdf, car_parts=car_parts
        )
        if result is None:
            st.write("Image is irrelevant, upload another one")
            st.session_state["status"] = "irrelevant"
            return
        print(f"Generated invoice: {path_to_output_pdf}")
        st.session_state["generated_pdf"] = path_to_output_pdf
        st.session_state["invoice_info"] = result["invoice_info"]
        st.session_state["invoice_path"] = f"{data_folder}/invoices/{result['invoice_path']}"
        st.session_state["similar_image"] = f"{data_folder}/images/{result['similar_image']}"
        st.session_state["damage_description"] = result["damage_description"]
        st.session_state["detailed_damage_description"] = result["detailed_damage_description"]
        return get_image_from_pdf(path_to_output_pdf)
    except Exception as e:
        st.write("Could not generate invoice, please try again")
        print(e)
        return None


st.title("Upload FNOL photo")

col1, col2, col3 = st.columns([4, 1, 4])

with col1:
    uploaded_image = st.file_uploader("Upload photo", type=["jpg", "jpeg", "png"])
    if uploaded_image:
        try:
            image = Image.open(uploaded_image)
            image_path = f"{output_folder}/{str(uuid4())[:5]}.png"
            image.save(image_path)
            print(f"Image: {image_path}")
            st.image(image, caption="Uploaded photo", width=300)
            st.session_state["image"] = image_path
        except Exception as e:
            st.write(f"Coudn't load image: {e}")

with col2:
    if st.session_state.get("image"):
        if st.button("Generate invoice"):
            with st.spinner("Generating..."):
                st.session_state["invoice"] = display_invoice(st.session_state["image"])
                if st.session_state["invoice"]:
                    st.session_state["status"] = "loaded"
    else:
        st.button("Generate invoice", disabled=True)
    if st.session_state.get("generated_pdf"):
        with open(st.session_state["generated_pdf"], "rb") as f:
            file_data = f.read()
        st.download_button(
            label="Download invoice",
            data=file_data,
            file_name="generated_invoice.pdf",
            mime="application/pdf"
        )

with col3:
    if st.session_state.get("status") == "loaded":
        st.image(st.session_state["invoice"], caption="Generated invoice", use_container_width=True)
        st.image(st.session_state["similar_image"], caption="Similar accident", width=300)
        st.write(f"Detailed damage description: {st.session_state['detailed_damage_description']}")
        st.write(f"Damage description: {st.session_state['damage_description']}")
        st.image(get_image_from_pdf(st.session_state["invoice_path"]), caption="Invoice of similar accident type", use_container_width=True)