# -*- coding: utf-8 -*-

# Copyright (c) 2003 - 2023 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a Python code coverage dialog.
"""

import os
import time

from coverage import Coverage
from coverage.misc import CoverageException
from PyQt6.QtCore import Qt, QUrl, pyqtSignal, pyqtSlot
from PyQt6.QtGui import QDesktopServices
from PyQt6.QtWidgets import (
    QApplication,
    QDialog,
    QDialogButtonBox,
    QHeaderView,
    QMenu,
    QTreeWidgetItem,
)

from eric7.EricWidgets import EricMessageBox
from eric7.EricWidgets.EricApplication import ericApp
from eric7.SystemUtilities import FileSystemUtilities

from .Ui_PyCoverageDialog import Ui_PyCoverageDialog


class PyCoverageDialog(QDialog, Ui_PyCoverageDialog):
    """
    Class implementing a dialog to display the collected code coverage data.

    @signal openFile(str) emitted to open the given file in an editor
    """

    openFile = pyqtSignal(str)

    def __init__(self, parent=None):
        """
        Constructor

        @param parent parent widget
        @type QWidget
        """
        super().__init__(parent)
        self.setupUi(self)
        self.setWindowFlags(Qt.WindowType.Window)

        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setDefault(True)

        self.summaryList.headerItem().setText(self.summaryList.columnCount(), "")
        self.resultList.headerItem().setText(self.resultList.columnCount(), "")

        self.cancelled = False
        self.path = "."
        self.reload = False

        self.excludeList = ["# *pragma[: ]*[nN][oO] *[cC][oO][vV][eE][rR]"]

        self.__reportsMenu = QMenu(self.tr("Create Report"), self)
        self.__reportsMenu.addAction(self.tr("HTML Report"), self.__htmlReport)
        self.__reportsMenu.addSeparator()
        self.__reportsMenu.addAction(self.tr("JSON Report"), self.__jsonReport)
        self.__reportsMenu.addAction(self.tr("LCOV Report"), self.__lcovReport)

        self.__menu = QMenu(self)
        self.__menu.addSeparator()
        self.openAct = self.__menu.addAction(self.tr("Open"), self.__openFile)
        self.__menu.addSeparator()
        self.__menu.addMenu(self.__reportsMenu)
        self.__menu.addSeparator()
        self.__menu.addAction(self.tr("Erase Coverage Info"), self.__erase)
        self.resultList.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
        self.resultList.customContextMenuRequested.connect(self.__showContextMenu)

    def __format_lines(self, lines):
        """
        Private method to format a list of integers into string by coalescing
        groups.

        @param lines list of integers
        @type list of int
        @return string representing the list
        @rtype str
        """
        pairs = []
        lines.sort()
        maxValue = lines[-1]
        start = None

        i = lines[0]
        while i <= maxValue:
            try:
                if start is None:
                    start = i
                ind = lines.index(i)
                end = i
                i += 1
            except ValueError:
                pairs.append((start, end))
                start = None
                if ind + 1 >= len(lines):
                    break
                i = lines[ind + 1]
        if start:
            pairs.append((start, end))

        def stringify(pair):
            """
            Private helper function to generate a string representation of a
            pair.

            @param pair pair of integers
            @type tuple of (int, int
            @return representation of the pair
            @rtype str
            """
            start, end = pair
            if start == end:
                return "{0:d}".format(start)
            else:
                return "{0:d}-{1:d}".format(start, end)

        return ", ".join(map(stringify, pairs))

    def __createResultItem(
        self, file, statements, executed, coverage, excluded, missing
    ):
        """
        Private method to create an entry in the result list.

        @param file filename of file
        @type str
        @param statements number of statements
        @type int
        @param executed number of executed statements
        @type int
        @param coverage percent of coverage
        @type int
        @param excluded list of excluded lines
        @type str
        @param missing list of lines without coverage
        @type str
        """
        itm = QTreeWidgetItem(
            self.resultList,
            [
                file,
                str(statements),
                str(executed),
                "{0:.0f}%".format(coverage),
                excluded,
                missing,
            ],
        )
        for col in range(1, 4):
            itm.setTextAlignment(col, Qt.AlignmentFlag.AlignRight)
        if statements != executed:
            font = itm.font(0)
            font.setBold(True)
            for col in range(itm.columnCount()):
                itm.setFont(col, font)

    def start(self, cfn, fn):
        """
        Public slot to start the coverage data evaluation.

        @param cfn basename of the coverage file
        @type str
        @param fn file or list of files or directory to be checked
        @type str or list of str
        """
        # initialize the dialog
        self.resultList.clear()
        self.summaryList.clear()
        self.cancelled = False
        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setDefault(True)

        self.__cfn = cfn
        self.__fn = fn

        self.cfn = (
            cfn
            if cfn.endswith(".coverage")
            else "{0}.coverage".format(os.path.splitext(cfn)[0])
        )

        if isinstance(fn, list):
            files = fn
            self.path = os.path.dirname(cfn)
        elif os.path.isdir(fn):
            files = FileSystemUtilities.direntries(fn, True, "*.py", False)
            self.path = fn
        else:
            files = [fn]
            self.path = os.path.dirname(cfn)
        files.sort()

        cover = Coverage(data_file=self.cfn)
        cover.load()

        # set the exclude pattern
        self.excludeCombo.clear()
        self.excludeCombo.addItems(self.excludeList)

        self.checkProgress.setMaximum(len(files))
        QApplication.processEvents()

        total_statements = 0
        total_executed = 0
        total_exceptions = 0

        cover.exclude(self.excludeList[0])

        try:
            # disable updates of the list for speed
            self.resultList.setUpdatesEnabled(False)
            self.resultList.setSortingEnabled(False)

            # now go through all the files
            now = time.monotonic()
            for progress, file in enumerate(files, start=1):
                if self.cancelled:
                    return

                try:
                    statements, excluded, missing, readable = cover.analysis2(file)[1:]
                    readableEx = excluded and self.__format_lines(excluded) or ""
                    n = len(statements)
                    m = n - len(missing)
                    pc = 100.0 * m / n if n > 0 else 100.0
                    self.__createResultItem(
                        file, str(n), str(m), pc, readableEx, readable
                    )

                    total_statements += n
                    total_executed += m
                except CoverageException:
                    total_exceptions += 1

                self.checkProgress.setValue(progress)
                if time.monotonic() - now > 0.01:
                    QApplication.processEvents()
                    now = time.monotonic()
        finally:
            # reenable updates of the list
            self.resultList.setSortingEnabled(True)
            self.resultList.setUpdatesEnabled(True)
            self.checkProgress.reset()

        # show summary info
        if len(files) > 1:
            if total_statements > 0:
                pc = 100.0 * total_executed / total_statements
            else:
                pc = 100.0
            itm = QTreeWidgetItem(
                self.summaryList,
                [str(total_statements), str(total_executed), "{0:.0f}%".format(pc)],
            )
            for col in range(0, 3):
                itm.setTextAlignment(col, Qt.AlignmentFlag.AlignRight)
        else:
            self.summaryGroup.hide()

        if total_exceptions:
            EricMessageBox.warning(
                self,
                self.tr("Parse Error"),
                self.tr(
                    """%n file(s) could not be parsed. Coverage"""
                    """ info for these is not available.""",
                    "",
                    total_exceptions,
                ),
            )

        self.__finish()

    def __finish(self):
        """
        Private slot called when the action finished or the user pressed the
        button.
        """
        self.cancelled = True
        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setDefault(True)
        QApplication.processEvents()
        self.resultList.header().resizeSections(QHeaderView.ResizeMode.ResizeToContents)
        self.resultList.header().setStretchLastSection(True)
        self.summaryList.header().resizeSections(
            QHeaderView.ResizeMode.ResizeToContents
        )
        self.summaryList.header().setStretchLastSection(True)

    def on_buttonBox_clicked(self, button):
        """
        Private slot called by a button of the button box clicked.

        @param button button that was clicked
        @type QAbstractButton
        """
        if button == self.buttonBox.button(QDialogButtonBox.StandardButton.Close):
            self.close()
        elif button == self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel):
            self.__finish()

    def __showContextMenu(self, coord):
        """
        Private slot to show the context menu of the listview.

        @param coord position of the mouse pointer
        @type QPoint
        """
        itm = self.resultList.itemAt(coord)
        if itm:
            self.openAct.setEnabled(True)
        else:
            self.openAct.setEnabled(False)
        self.__reportsMenu.setEnabled(bool(self.resultList.topLevelItemCount()))
        self.__menu.popup(self.mapToGlobal(coord))

    def __openFile(self, itm=None):
        """
        Private slot to open the selected file.

        @param itm reference to the item to be opened
        @type QTreeWidgetItem
        """
        if itm is None:
            itm = self.resultList.currentItem()
        fn = itm.text(0)

        try:
            vm = ericApp().getObject("ViewManager")
            vm.openSourceFile(fn)
            editor = vm.getOpenEditor(fn)
            editor.codeCoverageShowAnnotations(coverageFile=self.cfn)
        except KeyError:
            self.openFile.emit(fn)

    def __prepareReportGeneration(self):
        """
        Private method to prepare a report generation.

        @return tuple containing a reference to the Coverage object and the
            list of files to report
        @rtype tuple of (Coverage, list of str)
        """
        count = self.resultList.topLevelItemCount()
        if count == 0:
            return None, []

        # get list of all filenames
        files = [self.resultList.topLevelItem(index).text(0) for index in range(count)]

        cover = Coverage(data_file=self.cfn)
        cover.exclude(self.excludeList[0])
        cover.load()

        return cover, files

    @pyqtSlot()
    def __htmlReport(self):
        """
        Private slot to generate a HTML report of the shown data.
        """
        from .PyCoverageHtmlReportDialog import PyCoverageHtmlReportDialog

        dlg = PyCoverageHtmlReportDialog(os.path.dirname(self.cfn), self)
        if dlg.exec() == QDialog.DialogCode.Accepted:
            title, outputDirectory, extraCSS, openReport = dlg.getData()

            cover, files = self.__prepareReportGeneration()
            cover.html_report(
                morfs=files,
                directory=outputDirectory,
                ignore_errors=True,
                extra_css=extraCSS,
                title=title,
            )

            if openReport:
                QDesktopServices.openUrl(
                    QUrl.fromLocalFile(os.path.join(outputDirectory, "index.html"))
                )

    @pyqtSlot()
    def __jsonReport(self):
        """
        Private slot to generate a JSON report of the shown data.
        """
        from .PyCoverageJsonReportDialog import PyCoverageJsonReportDialog

        dlg = PyCoverageJsonReportDialog(os.path.dirname(self.cfn), self)
        if dlg.exec() == QDialog.DialogCode.Accepted:
            filename, compact = dlg.getData()
            cover, files = self.__prepareReportGeneration()
            cover.json_report(
                morfs=files,
                outfile=filename,
                ignore_errors=True,
                pretty_print=not compact,
            )

    @pyqtSlot()
    def __lcovReport(self):
        """
        Private slot to generate a LCOV report of the shown data.
        """
        from eric7.EricWidgets import EricPathPickerDialog
        from eric7.EricWidgets.EricPathPicker import EricPathPickerModes

        filename, ok = EricPathPickerDialog.getStrPath(
            self,
            self.tr("LCOV Report"),
            self.tr("Enter the path of the output file:"),
            mode=EricPathPickerModes.SAVE_FILE_ENSURE_EXTENSION_MODE,
            strPath=os.path.join(os.path.dirname(self.cfn), "coverage.lcov"),
            defaultDirectory=os.path.dirname(self.cfn),
            filters=self.tr("LCOV Files (*.lcov);;All Files (*)"),
        )
        if ok:
            cover, files = self.__prepareReportGeneration()
            cover.lcov_report(morfs=files, outfile=filename, ignore_errors=True)

    def __erase(self):
        """
        Private slot to handle the erase context menu action.

        This method erases the collected coverage data that is
        stored in the .coverage file.
        """
        cover = Coverage(data_file=self.cfn)
        cover.load()
        cover.erase()

        self.reloadButton.setEnabled(False)
        self.resultList.clear()
        self.summaryList.clear()

    @pyqtSlot()
    def on_reloadButton_clicked(self):
        """
        Private slot to reload the coverage info.
        """
        self.reload = True
        excludePattern = self.excludeCombo.currentText()
        if excludePattern in self.excludeList:
            self.excludeList.remove(excludePattern)
        self.excludeList.insert(0, excludePattern)
        self.start(self.__cfn, self.__fn)

    @pyqtSlot(QTreeWidgetItem, int)
    def on_resultList_itemActivated(self, item, column):
        """
        Private slot to handle the activation of an item.

        @param item reference to the activated item (QTreeWidgetItem)
        @param column column the item was activated in (integer)
        """
        self.__openFile(item)
