#!/usr/bin/env python3
from textual.app import ComposeResult
from textual.widgets import (
    Header,
    Footer,
    Label,
    Input,
    Select,
    Button,
    Markdown,
)
from textual.containers import ScrollableContainer
from textual.screen import Screen

from heurams.services.version import ver
import toml
from pathlib import Path
from heurams.context import config_var


class NucleonCreatorScreen(Screen):
    BINDINGS = [("q", "go_back", "返回")]

    def __init__(self) -> None:
        super().__init__(name=None, id=None, classes=None)

    def search_templates(self):
        from pathlib import Path
        from heurams.context import config_var

        template_dir = Path(config_var.get()["paths"]["template_dir"])
        templates = list()
        for i in template_dir.iterdir():
            if i.name.endswith(".toml"):
                try:
                    import toml

                    with open(i, "r") as f:
                        dic = toml.load(f)
                        desc = dic["__metadata__.attribution"]["desc"]
                        templates.append(desc + " (" + i.name + ")")
                except Exception as e:
                    templates.append(f"无描述模板 ({i.name})")
                    print(e)
        return templates

    def compose(self) -> ComposeResult:
        yield Header(show_clock=True)
        with ScrollableContainer(id="vice_container"):
            yield Label(f"[b]空白单元集创建向导\n")
            yield Markdown(
                "> 提示: 你可能注意到当选中文本框时底栏和操作按键绑定将被覆盖  \n只需选中(使用鼠标或 Tab)选择框即可恢复底栏功能"
            )
            yield Markdown("1. 键入单元集名称")
            yield Input(placeholder="单元集名称", id="name_input")
            yield Markdown(
                "> 单元集名称不应与现有单元集重复.  \n> 新的单元集文件将创建在 ./nucleon/你输入的名称.toml"
            )
            yield Label(f"\n")
            yield Markdown("2. 选择单元集模板")
            LINES = self.search_templates()
            """带有宏支持的空白单元集 ({ver})
古诗词模板单元集 ({ver})
英语词汇和短语模板单元集 ({ver})
"""
            yield Select.from_values(LINES, prompt="选择类型", id="template_select")
            yield Markdown("> 新单元集的版本号将和主程序版本保持同步")
            yield Label(f"\n")
            yield Markdown("3. 输入常见附加元数据 (可选)")
            yield Input(placeholder="作者", id="author_input")
            yield Input(placeholder="内容描述", id="desc_input")
            yield Button(
                "新建空白单元集",
                id="submit_button",
                variant="primary",
                classes="start-button",
            )
        yield Footer()

    def on_mount(self):
        self.query_one("#submit_button").focus()

    def action_go_back(self):
        self.app.pop_screen()

    def action_quit_app(self):
        self.app.exit()

    def on_button_pressed(self, event) -> None:
        event.stop()
        if event.button.id == "submit_button":
            # 获取输入值
            name_input = self.query_one("#name_input")
            template_select = self.query_one("#template_select")
            author_input = self.query_one("#author_input")
            desc_input = self.query_one("#desc_input")
            
            name = name_input.value.strip() # type: ignore
            author = author_input.value.strip() # type: ignore
            desc = desc_input.value.strip() # type: ignore
            selected = template_select.value # type: ignore
            
            # 验证
            if not name:
                self.notify("单元集名称不能为空", severity="error")
                return
            
            # 获取配置路径
            config = config_var.get()
            nucleon_dir = Path(config["paths"]["nucleon_dir"])
            template_dir = Path(config["paths"]["template_dir"])
            
            # 检查文件是否已存在
            nucleon_path = nucleon_dir / f"{name}.toml"
            if nucleon_path.exists():
                self.notify(f"单元集 '{name}' 已存在", severity="error")
                return
            
            # 确定模板文件
            if selected is None:
                self.notify("请选择一个模板", severity="error")
                return
            # selected 是描述字符串，格式如 "描述 (filename.toml)"
            # 提取文件名
            import re
            match = re.search(r'\(([^)]+)\)$', selected)
            if not match:
                self.notify("模板选择格式无效", severity="error")
                return
            template_filename = match.group(1)
            template_path = template_dir / template_filename
            if not template_path.exists():
                self.notify(f"模板文件不存在: {template_filename}", severity="error")
                return
            
            # 加载模板
            try:
                with open(template_path, 'r', encoding='utf-8') as f:
                    template_data = toml.load(f)
            except Exception as e:
                self.notify(f"加载模板失败: {e}", severity="error")
                return
            
            # 更新元数据
            metadata = template_data.get("__metadata__", {})
            attribution = metadata.get("attribution", {})
            if author:
                attribution["author"] = author
            if desc:
                attribution["desc"] = desc
            attribution["name"] = name
            # 可选: 设置版本
            attribution["version"] = ver
            metadata["attribution"] = attribution
            template_data["__metadata__"] = metadata
            
            # 确保 nucleon_dir 存在
            nucleon_dir.mkdir(parents=True, exist_ok=True)
            
            # 写入新文件
            try:
                with open(nucleon_path, 'w', encoding='utf-8') as f:
                    toml.dump(template_data, f)
            except Exception as e:
                self.notify(f"保存单元集失败: {e}", severity="error")
                return
            
            self.notify(f"单元集 '{name}' 创建成功")
            self.app.pop_screen()