from flask import Blueprint, render_template, request, redirect, flash, current_app, url_for
from app.services.db_service import db
from app.models.subcontractor_model import Subcontractor
from app.utils.helpers import login_required

subcontractor_bp = Blueprint("subcontractor", __name__, url_prefix="/subcontractor")


# ---------------- ADD -----------------
@subcontractor_bp.route("/add")
@login_required
def add_subcontractor():
    current_app.logger.info("Opened Add Subcontractor Page")
    return render_template("subcontractor/add.html")


# ---------------- SAVE -----------------
@subcontractor_bp.route("/save", methods=["POST"])
@login_required
def save_subcontractor():

    name = request.form.get("subcontractor_name", "").strip()

    if not name:
        current_app.logger.warning("Empty subcontractor name submitted")
        flash("Subcontractor name cannot be empty.", "danger")
        return redirect(url_for("subcontractor.add_subcontractor"))

    existing_sub = Subcontractor.query.filter_by(subcontractor_name=name).first()

    if existing_sub:
        current_app.logger.warning(f"Duplicate subcontractor attempt: {name}")
        flash(f"Subcontractor with name '{name}' already exists!", "danger")
        return redirect(url_for("subcontractor.add_subcontractor"))

    try:
        subcontractor = Subcontractor(
            subcontractor_name=name,
            contact_person=request.form.get("contact_person"),
            address=request.form.get("address"),
            mobile_no=request.form.get("mobile_no"),
            email_id=request.form.get("email_id"),
            gst_no=request.form.get("gst_no"),
            pan_no=request.form.get("pan_no")
        )

        db.session.add(subcontractor)
        db.session.commit()

        current_app.logger.info(f"Subcontractor Created Successfully: {name}")
        flash("Subcontractor added successfully!", "success")

    except Exception:
        db.session.rollback()
        current_app.logger.exception("Error while saving subcontractor")
        flash("An error occurred while saving.", "danger")

    return redirect(url_for("subcontractor.subcontractor_list"))


# ---------------- LIST (UPDATED WITH PAGINATION) -----------------
@subcontractor_bp.route("/list")
@login_required
def subcontractor_list():

    page = request.args.get("page", 1, type=int)
    per_page = 10  # Change how many records per page

    pagination = Subcontractor.query.order_by(
        Subcontractor.created_at
    ).paginate(
        page=page,
        per_page=per_page,
        error_out=False
    )

    subcontractors = pagination.items

    current_app.logger.info(f"Viewed Subcontractor List - Page {page}")

    return render_template(
        "subcontractor/list.html",
        subcontractors=subcontractors,
        pagination=pagination
    )


# ---------------- EDIT -----------------
@subcontractor_bp.route("/edit/<int:id>")
@login_required
def edit_subcontractor(id):
    subcontractor = Subcontractor.query.get_or_404(id)
    current_app.logger.info(f"Editing Subcontractor ID: {id}")
    return render_template("subcontractor/edit.html", subcontractor=subcontractor)


# ---------------- UPDATE -----------------
@subcontractor_bp.route("/update/<int:id>", methods=["POST"])
@login_required
def update_subcontractor(id):

    subcontractor = Subcontractor.query.get_or_404(id)
    new_name = request.form.get("subcontractor_name", "").strip()

    duplicate = Subcontractor.query.filter(
        Subcontractor.subcontractor_name == new_name,
        Subcontractor.id != id
    ).first()

    if duplicate:
        current_app.logger.warning(f"Duplicate update attempt: {new_name}")
        flash("Another subcontractor already uses this name.", "danger")
        return redirect(url_for("subcontractor.edit_subcontractor", id=id))

    try:
        old_name = subcontractor.subcontractor_name

        subcontractor.subcontractor_name = new_name
        subcontractor.contact_person = request.form.get("contact_person")
        subcontractor.address = request.form.get("address")
        subcontractor.mobile_no = request.form.get("mobile_no")
        subcontractor.email_id = request.form.get("email_id")
        subcontractor.gst_no = request.form.get("gst_no")
        subcontractor.pan_no = request.form.get("pan_no")
        subcontractor.status = request.form.get("status")

        db.session.commit()

        current_app.logger.info(f"Subcontractor Updated: {old_name} → {new_name}")
        flash("Subcontractor updated successfully!", "success")

    except Exception:
        db.session.rollback()
        current_app.logger.exception("Error updating subcontractor")
        flash("Update failed!", "danger")

    return redirect(url_for("subcontractor.subcontractor_list"))


# ---------------- DELETE -----------------
@subcontractor_bp.route("/delete/<int:id>")
@login_required
def delete_subcontractor(id):
    subcontractor = Subcontractor.query.get_or_404(id)

    try:
        name = subcontractor.subcontractor_name
        db.session.delete(subcontractor)
        db.session.commit()

        current_app.logger.info(f"Subcontractor Deleted: {name}")
        flash("Subcontractor deleted successfully!", "success")

    except Exception:
        db.session.rollback()
        current_app.logger.exception("Error deleting subcontractor")
        flash("Delete failed!", "danger")

    return redirect(url_for("subcontractor.subcontractor_list"))