import pandas as pd
import io
from flask import Blueprint, render_template, request, send_file, flash, jsonify,redirect, url_for
from app.utils.helpers import login_required
from app.utils.regex_utils import RegularExpression
from app import db
import re

from app.models.subcontractor_model import Subcontractor
from app.models.manhole_excavation_model import ManholeExcavation
from app.models.trench_excavation_model import TrenchExcavation
from app.models.manhole_domestic_chamber_model import ManholeDomesticChamber
from app.models.laying_model import Laying

from app.models.mh_ex_client_model import ManholeExcavationClient
from app.models.tr_ex_client_model import TrenchExcavationClient
from app.models.mh_dc_client_model import ManholeDomesticChamberClient
from app.models.laying_client_model import LayingClient

from app.services.abstract_service import AbstractReportService

 
# --- BLUEPRINT DEFINITION ---
file_report_bp = Blueprint("file_report", __name__, url_prefix="/file")
 

# ---------------- ACTION COLUMN ----------------
def add_action_columns(df, model_key):
    if df.empty:
        return df

    df.insert(0, "Select", df["Id"].apply(
        lambda x: f'<input type="checkbox" class="row-check" data-id="{x}">'
    ))
    
    df["Update"] = df["Id"].apply(
        lambda x: f'<a href="/file/edit/{model_key}/{x}" class="btn btn-sm btn-warning edit-btn"><i class="bi bi-pencil-square"></i> Edit</a>'
    )
    
    df["Delete"] = df["Id"].apply(
        lambda x: f'<button class="btn btn-sm btn-danger delete-btn" data-id="{x}" data-model="{model_key}">Delete</button>'
    )

    return df





# ---------------- FETCH ----------------
class SubcontractorBill:
    def __init__(self):
        self.df_tr = pd.DataFrame()
        self.df_mh = pd.DataFrame()
        self.df_dc = pd.DataFrame()
        self.df_laying = pd.DataFrame()
        # self.df_abstract = pd.DataFrame()   # NEW

    def Fetch(self, RA_Bill_No=None, subcontractor_id=None, location=None):

        filters = {}
        if subcontractor_id:
            filters["subcontractor_id"] = subcontractor_id
        if RA_Bill_No:
            filters["RA_Bill_No"] = RA_Bill_No

        # Fetch data in database
        trench = TrenchExcavation.query.filter_by(**filters).all()
        mh = ManholeExcavation.query.filter_by(**filters).all()
        dc = ManholeDomesticChamber.query.filter_by(**filters).all()
        lay = Laying.query.filter_by(**filters).all()
        
        # LOCATION FILTER
        if location:
            search = location.strip().lower()
            print("location::",search)
            trench = [
                t for t in trench
                if search in (t.Location or "").strip().lower()
            ]

            mh = [
                t for t in mh
                if search in (t.Location or "").strip().lower()
            ]

            dc = [
                t for t in dc
                if search in (t.Location or "").strip().lower()
            ]

            lay = [
                t for t in lay
                if search in (t.Location or "").strip().lower()
            ]
        
        # Set dataframe
        self.df_tr = pd.DataFrame([c.serialize() for c in trench])
        self.df_mh = pd.DataFrame([c.serialize() for c in mh])
        self.df_dc = pd.DataFrame([c.serialize() for c in dc])
        self.df_laying = pd.DataFrame([c.serialize() for c in lay])
        
        drop_cols = ["11", "_sa_instance_state", "subcontractor_id" , "created_at"]

        for df in [self.df_tr, self.df_mh, self.df_dc, self.df_laying]:
            if not df.empty:
                df.drop(columns=drop_cols, errors="ignore", inplace=True)
                format_column_names(df)
                
        name = ""
        if subcontractor_id:
            sc = Subcontractor.query.get(subcontractor_id)
            if sc:
                name = sc.subcontractor_name


# ---------------- DELETE ----------------
@file_report_bp.route("/delete_records", methods=["POST"])
@login_required
def delete_records():

    data = request.json or {}
    model = data.get("model")
    ids = data.get("ids", [])

    model_map = {
        "tr": TrenchExcavation,
        "mh": ManholeExcavation,
        "dc": ManholeDomesticChamber,
        "laying": Laying
    }

    ModelClass = model_map.get(model)

    # validate model BEFORE using it
    if not ModelClass:
        return jsonify({"status": "error", "message": f"Invalid model '{model}'"}), 400

    if not ids:
        return jsonify({"status": "error", "message": "No IDs provided"}), 400

    try:
        for record_id in ids:
            obj = ModelClass.query.get(record_id)
            if obj:
                db.session.delete(obj)

        db.session.commit()
        return jsonify({"status": "success"})
    except Exception as e:
        db.session.rollback()
        return jsonify({"status": "error", "message": str(e)}), 500


@file_report_bp.route("/edit/<string:model>/<int:record_id>", methods=["GET", "POST"])
@login_required
def edit_record(model, record_id):

    model_map = {
        "tr": TrenchExcavation,
        "mh": ManholeExcavation,
        "dc": ManholeDomesticChamber,
        "laying": Laying
    }

    ModelClass = model_map.get(model)

    if not ModelClass:
        flash("Invalid Model.", "danger")
        return redirect(url_for("file_report.report_file"))

    record = ModelClass.query.get_or_404(record_id)

    if request.method == "POST":

        # Update all fields except id
        for column in record.__table__.columns:

            if column.name == "id":
                continue

            if column.name in request.form:
                setattr(record, column.name, request.form.get(column.name))

        try:
            db.session.commit()
            flash("Record updated successfully.", "success")
            # ✅ fixed: correct blueprint name
            return redirect(url_for("file_report.report_file"))

        except Exception as e:
            db.session.rollback()
            flash(str(e), "danger")

    return render_template(
        "edit_record.html",
        record=record,
        model=model
    )


@file_report_bp.route("/Subcontractor_report", methods=["GET", "POST"])
@login_required
def report_file():
    # get all subcontractor data
    subcontractors = Subcontractor.query.all()
    
    tables = None
    abstract_html = ""
    selected_sc_id = None
    ra_bill_no = ""
    location = ""
    category = ""

    # Search or load data
    if request.method == "POST":
        # get from data
        subcontractor_id = request.form.get("subcontractor_id")
        ra_bill_no = request.form.get("ra_bill_no", "").strip()
        location = request.form.get("location", "").strip()
        category = request.form.get("category", "")
        action = request.form.get("action", "preview")

        if not subcontractor_id:
            flash("Select Subcontractor", "danger")
            return render_template(
                "subcontractor_report.html",
                subcontractors=subcontractors
            )
        
        selected_sc_id = subcontractor_id
        bill = SubcontractorBill()

        if action == "excel_all":
            bill.Fetch(subcontractor_id=subcontractor_id)
        else:
            bill.Fetch(ra_bill_no,subcontractor_id,location)
            
        # -----------------------------------------
        # Generate Abstract Report for Web
        # -----------------------------------------
        abstract_service = AbstractReportService(
            subcontractor_id=subcontractor_id,
            ra_bill_no=ra_bill_no
        )
        abstract_html = abstract_service.generate_html()

        # ---------------- CATEGORY FILTER ----------------
        if category == "tr":
            bill.df_mh = bill.df_dc = bill.df_laying = pd.DataFrame()
        elif category == "mh":
            bill.df_tr = bill.df_dc = bill.df_laying = pd.DataFrame()
        elif category == "dc":
            bill.df_tr = bill.df_mh = bill.df_laying = pd.DataFrame()
        elif category == "laying":
            bill.df_tr = bill.df_mh = bill.df_dc = pd.DataFrame()
            

        # ===================================================
        # DOWNLOAD EXCEL
        # ===================================================
        if action in ["excel", "excel_all"]:
            output = io.BytesIO()
            
            with pd.ExcelWriter(output,engine="xlsxwriter") as writer:
                workbook = writer.book
                abstract = AbstractReportService(subcontractor_id=subcontractor_id,ra_bill_no=ra_bill_no)
                abstract.generate(workbook)
                
                bill.df_tr.to_excel(writer,sheet_name="Tr.Ex",index=False)
                bill.df_mh.to_excel(writer,sheet_name="Mh.Ex",index=False)
                bill.df_dc.to_excel(writer,sheet_name="MH & DC",index=False)
                bill.df_laying.to_excel(writer,sheet_name="Pipe Laying",index=False)
                writer.close()
            output.seek(0)
            
            return send_file(
                output,
                download_name= "subcontractor_Report.xlsx",
                as_attachment=True 
            )

        # ===================================================
        # PDF
        # ===================================================
        if action == "pdf":
            flash(
                "PDF Export Coming Soon.",
                "info"
            ) 
    
        # ===================================================
        # ADD ACTIONS
        # ===================================================
        bill.df_tr = add_action_columns(bill.df_tr, "tr")
        bill.df_mh = add_action_columns(bill.df_mh, "mh")
        bill.df_dc = add_action_columns(bill.df_dc, "dc")
        bill.df_laying = add_action_columns(bill.df_laying, "laying")
        
        # this are html classes
        # table_class = ( "table " "table-bordered" "table-hover " "table-striped " "table-sm " "align-middle " "datatable " "mb-0")
        table_class = (
            "table "
            "table-bordered "
            "table-hover "
            "table-striped "
            "table-sm "
            "align-middle "
            "datatable "
            "text-nowrap "
            "mb-0"
        )
        
        # This are showing on web tables
        tables = {
            "tr": bill.df_tr.to_html(classes=table_class, index=False, escape=False),
            "mh": bill.df_mh.to_html(classes=table_class, index=False, escape=False),
            "dc": bill.df_dc.to_html(classes=table_class, index=False, escape=False ),
            "laying": bill.df_laying.to_html(classes=table_class, index=False, escape=False)
        }

    return render_template(
        "subcontractor_report.html",
        subcontractors=subcontractors,
        selected_sc_id=selected_sc_id,
        selected_ra_bill=ra_bill_no,
        selected_location=location,
        selected_category=category,
        tables=tables,
        abstract_html=abstract_html
    )


# --- Client class ---
class ClientBill:
    def __init__(self):
        self.df_tr = pd.DataFrame()
        self.df_mh = pd.DataFrame()
        self.df_dc = pd.DataFrame()
        self.df_laying = pd.DataFrame()
 
    def Fetch(self, RA_Bill_No):
        trench = TrenchExcavationClient.query.filter_by(RA_Bill_No=RA_Bill_No).all()
        mh = ManholeExcavationClient.query.filter_by(RA_Bill_No=RA_Bill_No).all()
        dc = ManholeDomesticChamberClient.query.filter_by(RA_Bill_No=RA_Bill_No).all()
        lay = LayingClient.query.filter_by(RA_Bill_No=RA_Bill_No).all()
 
        self.df_tr = pd.DataFrame([c.serialize() for c in trench])
        self.df_mh = pd.DataFrame([c.serialize() for c in mh])
        self.df_dc = pd.DataFrame([c.serialize() for c in dc])
        self.df_laying = pd.DataFrame([c.serialize() for c in lay])
  
        drop_cols = ["id", "created_at", "_sa_instance_state"]
        for df in [self.df_tr, self.df_mh, self.df_dc, self.df_laying]:
            if not df.empty:
                df.drop(columns=drop_cols, errors="ignore", inplace=True)
 


# --- CLIENT REPORT (PREVIEW + DOWNLOAD) ---
@file_report_bp.route("/client_report", methods=["GET", "POST"])
@login_required
def client_report():

    tables = {"tr": None, "mh": None, "dc": None, "laying": None}
    ra_val = ""

    if request.method == "POST":

        # ⚠ MUST match HTML name
        RA_Bill_No = request.form.get("RA_Bill_No")
        action = request.form.get("action")
        ra_val = RA_Bill_No

        if not RA_Bill_No:
            flash("Please enter RA Bill No.", "danger")
            return render_template("client_report.html", tables=tables, ra_val=ra_val)

        # -------- FETCH CLIENT DATA --------
        bill_gen = ClientBill()
        bill_gen.Fetch(RA_Bill_No)

        # If no data
        if (
            bill_gen.df_tr.empty and
            bill_gen.df_mh.empty and
            bill_gen.df_dc.empty and
            bill_gen.df_laying.empty
        ):
            flash(f"No Client records found for RA Bill {RA_Bill_No}", "warning")
            return render_template("client_report.html", tables=tables, ra_val=ra_val)

        # -------- DOWNLOAD --------
        if action == "download":

            output = io.BytesIO()

            with pd.ExcelWriter(output, engine="xlsxwriter") as writer:
                bill_gen.df_tr.to_excel(writer, index=False, sheet_name="Trench")
                bill_gen.df_mh.to_excel(writer, index=False, sheet_name="MH")
                bill_gen.df_dc.to_excel(writer, index=False, sheet_name="MH & DC")
                bill_gen.df_laying.to_excel(writer, index=False, sheet_name="Laying")

            output.seek(0)

            return send_file(
                output,
                download_name=f"Client_RA_{RA_Bill_No}_Report.xlsx",
                as_attachment=True
            )

        # -------- PREVIEW --------
        table_class = "table table-bordered table-striped table-hover table-sm"

        tables["tr"] = bill_gen.df_tr.to_html(classes=table_class, index=False)
        tables["mh"] = bill_gen.df_mh.to_html(classes=table_class, index=False)
        tables["dc"] = bill_gen.df_dc.to_html(classes=table_class, index=False)
        tables["laying"] = bill_gen.df_laying.to_html(classes=table_class, index=False)

    return render_template("client_report.html", tables=tables, ra_val=ra_val)


def format_column_names(df):
    if df.empty:
        return df

    new_columns = []

    for col in df.columns:

        # ----------------------------------------
        # Pipe columns
        # pipe_150_mm -> Pipe 150 MM
        # ----------------------------------------
        if RegularExpression.PIPE_MM_PATTERN.match(col):
            m = re.match(r"pipe_(\d+)_mm", col)
            new_columns.append(f"Pipe {m.group(1)} MM")
            continue

        # ----------------------------------------
        # Domestic Chamber
        # d_0_to_0_75 -> 0.00 To 0.75
        # d_1_5_to_3_0 -> 1.50 To 3.00
        # ----------------------------------------
        if RegularExpression.D_RANGE_PATTERN.match(col):

            value = col[2:]  # remove d_

            value = re.sub(
                r'(\d+)_(\d+)',
                lambda m: f"{m.group(1)}.{m.group(2)}",
                value
            )

            value = value.replace("_to_", " To ")

            new_columns.append(value)
            continue

        # ----------------------------------------
        # Total columns
        # Soft_Murum_0_to_1_5_total
        # ->
        # Soft Murum 0 To 1.5 Total
        # ----------------------------------------
        if RegularExpression.STR_TOTAL_PATTERN.match(col):

            value = col[:-6]  # remove _total

            value = re.sub(
                r'(\d+)_(\d+)',
                lambda m: f"{m.group(1)}.{m.group(2)}",
                value
            )

            value = value.replace("_to_", " To ")
            value = value.replace("_", " ")

            new_columns.append(value.title() + " Total")
            continue

        # ----------------------------------------
        # General columns
        # ----------------------------------------
        value = col.replace("_", " ").title()

        replacements = {
            "Mh No": "MH No",
            "Ra Bill No": "RA Bill No",
            "Cc Length": "CC Length",
            "Id Of Mh M": "ID of MH (m)",
            "Pipe Dia Mm": "Pipe Dia (MM)",
            "Mh Top Level": "MH Top Level",
            "Upto Il Depth": "Upto IL Depth",
            "Actual Trench Length": "Actual Trench Length",
            "Ground Level": "Ground Level",
            "Invert Level": "Invert Level",
            "Ex Dia Of Manhole": "External Dia of Manhole",
            "Area Of Manhole": "Area of Manhole",
            "Depth Of Mh": "Depth of MH",
        }

        value = replacements.get(value, value)

        new_columns.append(value)

    df.columns = new_columns

    return df