"""ask for an input file (.xlsx) and an output file (.pdf) and downloads and unite every invoice"""

import shutil
import tempfile
import openpyxl
import PyPDF2
import wx

def download_input_file(parent):
    """download input file"""
    start_date = parent.start_date_picker.GetValue().Format("%d/%m/%Y")
    end_date = parent.end_date_picker.GetValue().Format("%d/%m/%Y")
    input_file_url = 'https://report.casadicurasanrossore.it:8443/reportserver?/STAT_FATTURATO_CTERZI&dataI='+start_date+'&dataF='+end_date+'&rs:Format=EXCELOPENXML'
    downloaded_input_file = parent.session.get(input_file_url)
    if downloaded_input_file.status_code != 200:
        parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr(wx.RED, font=wx.Font(wx.FontInfo(8).Bold())))
        parent.log_dialog.log_text.AppendText("ERRORE: impossibile scaricare il file di input.\nControllare la connessione ad internet e l'operatività del portale CCSR. Code %d\n" % downloaded_input_file.status_code)
        parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr())
        wx.Yield()
        return

    input_file_descriptor, parent.input_file_path = tempfile.mkstemp(suffix='.xlsx')
    parent.input_files.append(parent.input_file_path)
    with open(input_file_descriptor, 'wb') as input_file:
        input_file.write(downloaded_input_file.content)

def get_invoices_info(input_file_path: str) -> tuple:
    """extract invoices IDs and URLs from xlsx input file"""
    xlsx_file = openpyxl.load_workbook(input_file_path)
    sheet = xlsx_file.active
    invoices = dict()

    owner_name = '_'.join(sheet["B1"].value.split()[2:])

    for i in range(1, sheet.max_row+1):
        invoice_id = sheet["I"+str(i)].value
        if invoice_id is not None and "CCSR" in invoice_id:
            invoice_id = invoice_id.replace("/", "-")
            invoice_url = sheet["BG"+str(i)].hyperlink.target
            invoice = {
                "id": invoice_id,
                "url": invoice_url,
                "path": None,
                "good": None,
            }
            invoices[invoice_id] = invoice
    invoices_info = (owner_name, invoices)
    return invoices_info

def download_invoices(parent):
    """download invoices from CCSR"""
    output_file_path = None

    parent.log_dialog.log_text.AppendText("Download file input\n")
    wx.Yield()
    download_input_file(parent)

    invoices_info = get_invoices_info(parent.input_file_path)
    invoices = invoices_info[1]

    parent.log_dialog.log_text.AppendText("Inizio download fatture dal portale CCSR\n")
    wx.Yield()

    tmp_dir = tempfile.mkdtemp()

    invoices_count = len(invoices)
    downloaded_count = 0

    for invoice_id, invoice in invoices.items():
        resp = parent.session.get(invoice["url"])
        if resp.status_code == 200:
            with open(tmp_dir+"/"+invoice_id+".pdf", "wb") as output_file:
                output_file.write(resp.content)
                invoice["path"] = output_file.name
                try:
                    PyPDF2.PdfFileReader(open(invoice["path"], "rb"))
                except (PyPDF2.utils.PdfReadError, OSError):
                    parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr(wx.RED, font=wx.Font(wx.FontInfo(8).Bold())))
                    parent.log_dialog.log_text.AppendText("Errore: fattura %s corrotta!\n" % invoice_id)
                    parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr())
                    wx.Yield()
                    invoice["good"] = False
                else:
                    downloaded_count += 1
                    parent.log_dialog.log_text.AppendText("%d/%d scaricata fattura %s in %s\n" % (downloaded_count, invoices_count, invoice_id, invoice["path"]))
                    wx.Yield()
                    invoice["good"] = True
        else:
            parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr(wx.RED, font=wx.Font(wx.FontInfo(8).Bold())))
            parent.log_dialog.log_text.AppendText("Errore: impossibile scaricare fattura %s: %d\n" % (invoice_id, resp.status_code))
            parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr())
            wx.Yield()
            invoice["good"] = False

    parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr(wx.BLACK, font=wx.Font(wx.FontInfo(8).Bold())))
    parent.log_dialog.log_text.AppendText("Download terminato.\n")
    parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr())
    wx.Yield()

    parent.output_pdf_dialog.SetFilename("fatture_%s.pdf" % invoices_info[0])

    if parent.output_pdf_dialog.ShowModal() == wx.ID_OK:
        output_file_path = parent.output_pdf_dialog.GetPath()
        merger = PyPDF2.PdfFileMerger()
        for invoice in invoices.values():
            if invoice["good"]:
                merger.append(PyPDF2.PdfFileReader(open(invoice["path"], "rb")))
        merger.write(output_file_path)

        shutil.rmtree(tmp_dir, ignore_errors=True)

        parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr(wx.BLACK, font=wx.Font(wx.FontInfo(8).Bold())))
        parent.log_dialog.log_text.AppendText("Il pdf contenente le fatture si trova in %s\n" % output_file_path)
        parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr())
        wx.Yield()
        parent.log_dialog.open_file_btn.Enable()

    else:
        parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr(wx.RED, font=wx.Font(wx.FontInfo(8).Bold())))
        parent.log_dialog.log_text.AppendText("Non è stata eseguita l'unione delle fatture in un singolo pdf.\nLe singole fatture si trovano in %s\n" % tmp_dir)
        parent.log_dialog.log_text.SetDefaultStyle(wx.TextAttr())
        wx.Yield()