"""
사용 설명 가이드 창.

i18n 사전(_HELP_HTML)에서 ko/en HTML을 가져와 6개 탭으로 표시.
"""
from PyQt5.QtWidgets import (QDialog, QVBoxLayout, QHBoxLayout, QLabel,
                             QPushButton, QWidget, QTabWidget, QTextBrowser)
from PyQt5.QtCore import Qt

from core.i18n import tr, tr_html
from ui.styles import apply_dark_titlebar


class HelpView(QDialog):
    """사용 설명 가이드 다이얼로그"""

    # (사전 키, 탭 라벨 키)
    _TABS = [
        ('help.html.intro', 'help.tab_intro'),
        ('help.html.work_hours', 'help.tab_work_hours'),
        ('help.html.overtime', 'help.tab_overtime'),
        ('help.html.leave', 'help.tab_leave'),
        ('help.html.break', 'help.tab_break'),
        ('help.html.faq', 'help.tab_faq'),
    ]

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle(tr('window.help'))
        self.setModal(True)
        self.setMinimumSize(680, 720)

        self.init_ui()
        apply_dark_titlebar(self)

    def init_ui(self):
        main_layout = QVBoxLayout()
        main_layout.setContentsMargins(0, 0, 0, 0)
        main_layout.setSpacing(0)

        title = QLabel(tr('window.help'))
        title.setObjectName("dialog_title")
        title.setAlignment(Qt.AlignCenter)
        main_layout.addWidget(title)

        tabs = QTabWidget()
        tabs.setDocumentMode(True)
        for html_key, tab_label_key in self._TABS:
            tabs.addTab(self._make_tab(tr_html(html_key)), tr(tab_label_key))
        main_layout.addWidget(tabs)

        button_layout = QHBoxLayout()
        button_layout.setContentsMargins(20, 10, 20, 20)
        button_layout.addStretch()
        close_button = QPushButton(tr('btn.close'))
        close_button.setObjectName("btn_primary")
        close_button.setMinimumHeight(40)
        close_button.setMinimumWidth(120)
        close_button.clicked.connect(self.close)
        button_layout.addWidget(close_button)
        button_layout.addStretch()
        main_layout.addLayout(button_layout)

        self.setLayout(main_layout)

    def _make_tab(self, html: str) -> QWidget:
        container = QWidget()
        layout = QVBoxLayout()
        layout.setContentsMargins(16, 12, 16, 12)
        browser = QTextBrowser()
        browser.setOpenExternalLinks(False)
        browser.setHtml(html)
        layout.addWidget(browser)
        container.setLayout(layout)
        return container


# 단독 실행 테스트
if __name__ == "__main__":
    import sys
    from PyQt5.QtWidgets import QApplication
    app = QApplication(sys.argv)
    dialog = HelpView()
    dialog.exec_()