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import streamlit as st
import requests
import json
import pandas as pd
import uuid
import os

# FHIR Server Base URL from environment variable
FHIR_BASE_URL = os.getenv("FHIR_BASE_URL")

st.title("FHIR API Explorer")
st.write("Explore the HAPI FHIR Server API")

st.sidebar.title("Navigation")
page = st.sidebar.radio("Select a page", ["Server Info", "Patient Search", "Resource Explorer", "CRUD Operations"])

if page == "Server Info":
    st.header("Server Capabilities")
    
    if st.button("Get Server Metadata"):
        try:
            response = requests.get(f"{FHIR_BASE_URL}/metadata")
            if response.status_code == 200:
                data = response.json()
                st.json(data)
            else:
                st.error(f"Error: {response.status_code}")
        except Exception as e:
            st.error(f"Error: {str(e)}")

elif page == "Patient Search":
    st.header("Patient Search")
    col1, col2 = st.columns(2)
    with col1:
        family_name = st.text_input("Family Name")
    with col2:
        identifier = st.text_input("Identifier")
    
    if st.button("Search Patients"):
        params = {}
        if family_name:
            params["family"] = family_name
        if identifier:
            params["identifier"] = identifier
        
        try:
            response = requests.get(f"{FHIR_BASE_URL}/Patient", params=params)
            if response.status_code == 200:
                data = response.json()
                
                if "entry" in data and len(data["entry"]) > 0:
                    patients = []
                    for entry in data["entry"]:
                        resource = entry["resource"]
                        patient = {
                            "id": resource.get("id", ""),
                            "name": ", ".join([name.get("family", "") for name in resource.get("name", [])]),
                            "gender": resource.get("gender", ""),
                            "birthDate": resource.get("birthDate", "")
                        }
                        patients.append(patient)
                    
                    st.dataframe(pd.DataFrame(patients))
                    with st.expander("Raw Response"):
                        st.json(data)
                else:
                    st.info("No patients found")
            else:
                st.error(f"Error: {response.status_code}")
        except Exception as e:
            st.error(f"Error: {str(e)}")

elif page == "Resource Explorer":
    st.header("Resource Explorer")
    
    resource_types = ["Patient", "Observation", "Medication", "Immunization", "Condition", "Procedure"]
    resource_type = st.selectbox("Select Resource Type", resource_types)
    
    resource_id = st.text_input("Resource ID (optional)")
    
    if st.button("Fetch Resources"):
        try:
            if resource_id:
                url = f"{FHIR_BASE_URL}/{resource_type}/{resource_id}"
            else:
                url = f"{FHIR_BASE_URL}/{resource_type}?_count=10"
                
            response = requests.get(url)
            if response.status_code == 200:
                data = response.json()
               
                if "resourceType" in data and data["resourceType"] != "Bundle":
                    st.write(f"Resource Type: {data['resourceType']}")
                    st.write(f"ID: {data.get('id', 'N/A')}")
                    
                    with st.expander("View Full Resource"):
                        st.json(data)
                else:
                    if "entry" in data and len(data["entry"]) > 0:
                        st.write(f"Found {len(data['entry'])} resources")
                        
                        resources = []
                        for entry in data["entry"]:
                            resource = entry["resource"]
                            resources.append({
                                "id": resource.get("id", ""),
                                "resourceType": resource.get("resourceType", ""),
                                "lastUpdated": resource.get("meta", {}).get("lastUpdated", "")
                            })
                        
                        st.dataframe(pd.DataFrame(resources))
                        
                        selected_id = st.selectbox("Select a resource to view details", 
                                                  [r["id"] for r in resources])
                        
                        if selected_id:
                            for entry in data["entry"]:
                                if entry["resource"].get("id") == selected_id:
                                    st.json(entry["resource"])
                    else:
                        st.info("No resources found")
            else:
                st.error(f"Error: {response.status_code}")
        except Exception as e:
            st.error(f"Error: {str(e)}")

elif page == "CRUD Operations":
    st.header("CRUD Operations")
    
    resource_types = ["Patient", "Observation", "Medication", "Immunization", "Condition", "Procedure"]
    resource_type = st.selectbox("Select Resource Type", resource_types)
    
    crud_tab = st.tabs(["Create", "Read", "Update", "Delete"])
    
    # CREATE
    with crud_tab[0]:
        st.subheader(f"Create New {resource_type}")
        
        if resource_type == "Patient":
            with st.form("create_patient_form"):
                family_name = st.text_input("Family Name")
                given_name = st.text_input("Given Name")
                gender = st.selectbox("Gender", ["male", "female", "other", "unknown"])
                birth_date = st.date_input("Birth Date")
                
                submit_button = st.form_submit_button("Create Patient")
                
                if submit_button:
                    patient_data = {
                        "resourceType": "Patient",
                        "name": [
                            {
                                "family": family_name,
                                "given": [given_name]
                            }
                        ],
                        "gender": gender,
                        "birthDate": str(birth_date)
                    }
                    
                    try:
                        headers = {"Content-Type": "application/fhir+json"}
                        response = requests.post(
                            f"{FHIR_BASE_URL}/Patient", 
                            json=patient_data,
                            headers=headers
                        )
                        
                        if response.status_code in [200, 201]:
                            st.success("Patient created successfully!")
                            st.json(response.json())
                        else:
                            st.error(f"Error: {response.status_code}")
                            st.write(response.text)
                    except Exception as e:
                        st.error(f"Error: {str(e)}")
        
        elif resource_type == "Observation":
            with st.form("create_observation_form"):
                patient_id = st.text_input("Patient ID")
                code_display = st.text_input("Observation Name", "Heart rate")
                code_system = st.text_input("Code System", "http://loinc.org")
                code_code = st.text_input("Code", "8867-4")
                value = st.number_input("Value", value=80)
                unit = st.text_input("Unit", "beats/minute")
                
                submit_button = st.form_submit_button("Create Observation")
                
                if submit_button:
                    observation_data = {
                        "resourceType": "Observation",
                        "status": "final",
                        "code": {
                            "coding": [
                                {
                                    "system": code_system,
                                    "code": code_code,
                                    "display": code_display
                                }
                            ]
                        },
                        "subject": {
                            "reference": f"Patient/{patient_id}"
                        },
                        "valueQuantity": {
                            "value": value,
                            "unit": unit,
                            "system": "http://unitsofmeasure.org"
                        }
                    }
                    
                    try:
                        headers = {"Content-Type": "application/fhir+json"}
                        response = requests.post(
                            f"{FHIR_BASE_URL}/Observation", 
                            json=observation_data,
                            headers=headers
                        )
                        
                        if response.status_code in [200, 201]:
                            st.success("Observation created successfully!")
                            st.json(response.json())
                        else:
                            st.error(f"Error: {response.status_code}")
                            st.write(response.text)
                    except Exception as e:
                        st.error(f"Error: {str(e)}")
        
        else:
            st.write(f"Create a new {resource_type} resource:")
            
            template_json = {
                "resourceType": resource_type,
            }
            
            json_str = st.text_area("Edit JSON", json.dumps(template_json, indent=2), height=300)
            
            if st.button("Create Resource"):
                try:
                    resource_data = json.loads(json_str)
                    headers = {"Content-Type": "application/fhir+json"}
                    response = requests.post(
                        f"{FHIR_BASE_URL}/{resource_type}", 
                        json=resource_data,
                        headers=headers
                    )
                    
                    if response.status_code in [200, 201]:
                        st.success(f"{resource_type} created successfully!")
                        st.json(response.json())
                    else:
                        st.error(f"Error: {response.status_code}")
                        st.write(response.text)
                except json.JSONDecodeError:
                    st.error("Invalid JSON format")
                except Exception as e:
                    st.error(f"Error: {str(e)}")
    
    # READ
    with crud_tab[1]:
        st.subheader(f"Read {resource_type}")
        
        resource_id = st.text_input(f"{resource_type} ID")
        
        if st.button("Read Resource"):
            if not resource_id:
                st.warning("Please enter a resource ID")
            else:
                try:
                    response = requests.get(f"{FHIR_BASE_URL}/{resource_type}/{resource_id}")
                    
                    if response.status_code == 200:
                        st.success(f"{resource_type} retrieved successfully!")
                        st.json(response.json())
                    else:
                        st.error(f"Error: {response.status_code}")
                        st.write(response.text)
                except Exception as e:
                    st.error(f"Error: {str(e)}")
    
    # UPDATE
    with crud_tab[2]:
        st.subheader(f"Update {resource_type}")
        
        update_id = st.text_input(f"{resource_type} ID to update")
        
        if update_id:
            try:
                response = requests.get(f"{FHIR_BASE_URL}/{resource_type}/{update_id}")
                
                if response.status_code == 200:
                    resource_data = response.json()
                    
                    json_str = st.text_area("Edit JSON", json.dumps(resource_data, indent=2), height=300)
                    
                    if st.button("Update Resource"):
                        try:
                            updated_data = json.loads(json_str)
                            headers = {"Content-Type": "application/fhir+json"}
                            update_response = requests.put(
                                f"{FHIR_BASE_URL}/{resource_type}/{update_id}", 
                                json=updated_data,
                                headers=headers
                            )
                            
                            if update_response.status_code in [200, 201]:
                                st.success(f"{resource_type} updated successfully!")
                                st.json(update_response.json())
                            else:
                                st.error(f"Error: {update_response.status_code}")
                                st.write(update_response.text)
                        except json.JSONDecodeError:
                            st.error("Invalid JSON format")
                        except Exception as e:
                            st.error(f"Error: {str(e)}")
                else:
                    st.error(f"Error fetching resource: {response.status_code}")
            except Exception as e:
                st.error(f"Error: {str(e)}")
        else:
            st.info(f"Enter a {resource_type} ID to update")
    
    # DELETE
    with crud_tab[3]:
        st.subheader(f"Delete {resource_type}")
        
        delete_id = st.text_input(f"{resource_type} ID to delete")
        
        if delete_id:
            st.warning(f"Are you sure you want to delete {resource_type}/{delete_id}?")
            
            if st.button("Confirm Delete"):
                try:
                    response = requests.delete(f"{FHIR_BASE_URL}/{resource_type}/{delete_id}")
                    
                    if response.status_code in [200, 204]:
                        st.success(f"{resource_type} deleted successfully!")
                    else:
                        st.error(f"Error: {response.status_code}")
                        st.write(response.text)
                except Exception as e:
                    st.error(f"Error: {str(e)}")
        else:
            st.info(f"Enter a {resource_type} ID to delete")

# Footer
st.markdown("---")
st.markdown("FHIR API Explorer - Using HAPI FHIR Server")