from django.template.loader import render_to_string
from liveview import liveview_handler, send

from app.expenses.models import Category, FixedExpenseConcept, Subcategory


def _render_categories(editing_category=None, editing_subcategory=None):
	categories = Category.objects.prefetch_related("subcategories").all()
	return render_to_string(
		"pages/expenses/partials/categories_section.html",
		{
			"categories": categories,
			"editing_category": editing_category,
			"editing_subcategory": editing_subcategory,
		},
	)


def _render_fixed_expenses(editing_id=None):
	fixed_expenses = FixedExpenseConcept.objects.all()
	return render_to_string(
		"pages/expenses/partials/fixed_expenses_section.html",
		{"fixed_expenses": fixed_expenses, "editing_id": editing_id},
	)


# --- Categories ---


@liveview_handler("add_category")
def add_category(consumer, content):
	form = content.get("form", {})
	name = form.get("cat_name", "").strip()
	order = form.get("cat_order", "0")

	if not name:
		return

	try:
		order = int(order)
	except ValueError:
		order = 0

	Category.objects.create(name=name, order=order)
	html = _render_categories()
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("edit_category")
def edit_category(consumer, content):
	data = content.get("data", {})
	cat_id = data.get("data_id", "")
	if not cat_id:
		return

	try:
		category = Category.objects.get(id=cat_id)
	except Category.DoesNotExist:
		return

	html = _render_categories(editing_category=category.id)
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("save_category")
def save_category(consumer, content):
	form = content.get("form", {})
	cat_id = form.get("cat_id", "")
	name = form.get("cat_name", "").strip()
	order = form.get("cat_order", "0")

	if not cat_id or not name:
		return

	try:
		category = Category.objects.get(id=cat_id)
		category.name = name
		category.order = int(order)
		category.save()
	except (Category.DoesNotExist, ValueError):
		return

	html = _render_categories()
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("delete_category")
def delete_category(consumer, content):
	data = content.get("data", {})
	cat_id = data.get("data_id", "")
	if not cat_id:
		return

	Category.objects.filter(id=cat_id).delete()
	html = _render_categories()
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("cancel_edit_settings")
def cancel_edit_settings(consumer, content):
	data = content.get("data", {})
	section = data.get("data_section", "categories")

	if section == "fixed_expenses":
		html = _render_fixed_expenses()
		send(consumer, {"target": "#fixed-expenses-section", "html": html})
	else:
		html = _render_categories()
		send(consumer, {"target": "#categories-section", "html": html})


# --- Subcategories ---


@liveview_handler("add_subcategory")
def add_subcategory(consumer, content):
	form = content.get("form", {})
	name = form.get("sub_name", "").strip()
	order = form.get("sub_order", "0")
	cat_id = form.get("sub_category_id", "")

	if not name or not cat_id:
		return

	try:
		category = Category.objects.get(id=cat_id)
		order = int(order)
	except (Category.DoesNotExist, ValueError):
		return

	Subcategory.objects.create(name=name, order=order, category=category)
	html = _render_categories()
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("edit_subcategory")
def edit_subcategory(consumer, content):
	data = content.get("data", {})
	sub_id = data.get("data_id", "")
	if not sub_id:
		return

	try:
		sub = Subcategory.objects.get(id=sub_id)
	except Subcategory.DoesNotExist:
		return

	html = _render_categories(editing_subcategory=sub.id)
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("save_subcategory")
def save_subcategory(consumer, content):
	form = content.get("form", {})
	sub_id = form.get("sub_id", "")
	name = form.get("sub_name", "").strip()
	order = form.get("sub_order", "0")

	if not sub_id or not name:
		return

	try:
		sub = Subcategory.objects.get(id=sub_id)
		sub.name = name
		sub.order = int(order)
		sub.save()
	except (Subcategory.DoesNotExist, ValueError):
		return

	html = _render_categories()
	send(consumer, {"target": "#categories-section", "html": html})


@liveview_handler("delete_subcategory")
def delete_subcategory_handler(consumer, content):
	data = content.get("data", {})
	sub_id = data.get("data_id", "")
	if not sub_id:
		return

	try:
		sub = Subcategory.objects.get(id=sub_id)
		if sub.order == 99:
			return
		other = Subcategory.objects.get(category=sub.category, order=99)
		sub.expenses.update(subcategory=other)
		sub.delete()
	except Subcategory.DoesNotExist:
		return

	html = _render_categories()
	send(consumer, {"target": "#categories-section", "html": html})


# --- Fixed Expenses ---


@liveview_handler("add_fixed_expense")
def add_fixed_expense(consumer, content):
	form = content.get("form", {})
	name = form.get("fe_name", "").strip()
	order = form.get("fe_order", "0")

	if not name:
		return

	try:
		order = int(order)
	except ValueError:
		order = 0

	FixedExpenseConcept.objects.create(name=name, order=order)
	html = _render_fixed_expenses()
	send(consumer, {"target": "#fixed-expenses-section", "html": html})


@liveview_handler("edit_fixed_expense")
def edit_fixed_expense(consumer, content):
	data = content.get("data", {})
	fe_id = data.get("data_id", "")
	if not fe_id:
		return

	html = _render_fixed_expenses(editing_id=int(fe_id))
	send(consumer, {"target": "#fixed-expenses-section", "html": html})


@liveview_handler("save_fixed_expense")
def save_fixed_expense(consumer, content):
	form = content.get("form", {})
	fe_id = form.get("fe_id", "")
	name = form.get("fe_name", "").strip()
	order = form.get("fe_order", "0")

	if not fe_id or not name:
		return

	try:
		fe = FixedExpenseConcept.objects.get(id=fe_id)
		fe.name = name
		fe.order = int(order)
		fe.save()
	except (FixedExpenseConcept.DoesNotExist, ValueError):
		return

	html = _render_fixed_expenses()
	send(consumer, {"target": "#fixed-expenses-section", "html": html})


@liveview_handler("delete_fixed_expense")
def delete_fixed_expense_handler(consumer, content):
	data = content.get("data", {})
	fe_id = data.get("data_id", "")
	if not fe_id:
		return

	FixedExpenseConcept.objects.filter(id=fe_id).delete()
	html = _render_fixed_expenses()
	send(consumer, {"target": "#fixed-expenses-section", "html": html})