from PyQt6.QtWidgets import QWidget, QTextBrowser, QHBoxLayout, QListWidget, QListWidgetItem
from PyQt6.QtGui import QDesktopServices
from ...resources import get_resource_path
from .about import MarkdownView

import logging
log = logging.getLogger(__name__)

# Ordered list of help files to use
GUI_FILES = [
    ("about.md", "About"),
    ("sample_changing.md", "Changing the Sample"),
    ("measurement_settings.md", "Measurement Settings"),
    ("led_control.md", "LED Control"),
    ("troubleshooting.md", "Troubleshooting"),
    ("technical_information.md", "Technical Information"),
]

class HelpMenu(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setLayout(QHBoxLayout())
        self.w_list = QListWidget()
        self.w_list.setMaximumWidth(200)
        self.layout().addWidget(self.w_list)
        self.w_viewer = MarkdownView()
        self.layout().addWidget(self.w_viewer)
        files = [(get_resource_path(f), name) for (f,name) in GUI_FILES]
        for i, (f, name) in enumerate(files):
            w_item = QListWidgetItem(name)
            w_item.filepath = f
            self.w_list.addItem(w_item)
            if i == 0:
                self.set_view(w_item)
                self.w_list.setCurrentRow(0)
        self.w_list.itemClicked.connect(self.set_view)

    def set_view(self, list_item):
        try:
            filepath = list_item.filepath
            try:
                with open(filepath, "r") as file:
                    content = file.read()
                    self.w_viewer.setMarkdown(content)
            except FileNotFoundError:
                log.error(f"File not found: {filepath}")
                self.w_viewer.setMarkdown(f"## File not found\n`{filepath}`")
        except AttributeError:
            log.error(f"Invalid list item")