import random
import secrets
from pathlib import Path
from typing import Any

from nonebot import require

# 顺序很重要：先 require 声明依赖，再 import（与 war_renderer 一致）
require("nonebot_plugin_htmlrender")

from nonebot_plugin_htmlrender import get_new_page  # noqa: E402

from .war_renderer import _font_faces, _logo_data_uri, _rel

basic_path = Path(__file__).resolve().parents[1]
template_path = basic_path / "res" / "templates"
img_path = basic_path / "res" / "img"

# 战备类型 -> (标签, 主题色)
TYPE_STYLE: dict[str, dict[str, str]] = {
    "blue": {"label": "武装·补给", "color": "#6bb7ea"},
    "red": {"label": "轨道·飞鹰", "color": "#fe6d6a"},
    "green": {"label": "战术·设备", "color": "#7ecb3f"},
}


def _load_template(name: str) -> str:
    """读取 templates/ 下的模板文件（UTF-8），每次渲染实时读取，便于改模板即时生效。"""
    return (template_path / name).read_text(encoding="utf-8")


def _equip_icon(equip: dict[str, Any]) -> str:
    """战备图标：读取 img/helldivers/ 下的 PNG，配合 <base href> 用相对路径链接。"""
    raw = equip.get("path") or ""
    if not raw:
        return ""
    rel = raw.replace("\\", "/")
    # 兼容两种路径存法：插件根相对路径 res/img/...（新/播种数据），
    # 以及 res/img 目录相对路径 img/...（旧库迁移前遗留），统一找真实文件。
    candidates = [rel]
    if rel.startswith("res/"):
        candidates.append(rel[len("res/"):])
    else:
        candidates.append("res/" + rel)
    candidates.append("res/img/" + rel)
    for cand in candidates:
        p = basic_path / cand
        if p.exists():
            return f"<img class='eq-ic' src='{_rel(p)}' alt='' />"
    return ""


def _item_html(equip: dict[str, Any]) -> str:
    name = equip.get("name") or "未知战备"
    alias = (random.choice(equip["alias"]) if equip.get("alias") else None) or ""
    type_key = equip.get("type") or ""
    style = TYPE_STYLE.get(type_key, {"label": "其他", "color": "#cccccc"})
    label = style["label"]
    color = style["color"]
    backpack = "背包位" if equip.get("backpack") else ""
    alias_html = f"<span class='eq-alias'>{alias}</span>" if alias else ""
    meta_tail = f" · {backpack}" if backpack else ""
    return f"""
    <div class="eq-row">
      <div class="eq-icwrap">{_equip_icon(equip)}</div>
      <div class="eq-info">
        <div class="eq-name">{name}</div>
        <div class="eq-meta">
          <span class="eq-badge" style="color:{color};border-color:{color}">{label}</span>
          {alias_html}{meta_tail}
        </div>
      </div>
    </div>"""


def _build_html(items: list[dict[str, Any]]) -> str:
    rows = "".join(_item_html(e) for e in items)
    return (
        _load_template("equip_card.html")
        .replace("@@BASE@@", basic_path.as_uri() + "/")
        .replace("@@FONT_FACES@@", _font_faces())
        .replace("@@CSS@@", _load_template("equip_card.css"))
        .replace("@@LOGO@@", _logo_data_uri())
        .replace("@@ROWS@@", rows)
    )


async def _html_to_png(html: str, width: int = 640) -> bytes:
    async with get_new_page() as page:
        # 初始视口高度给一个小于内容的值，便于按 scrollHeight 收紧，避免截出多余空白
        await page.set_viewport_size({"width": width, "height": 300})
        # 图片/字体用相对路径 + <base href> 解析；写临时 .html 到插件根目录，
        # 使页面与 img/、data/ 同目录树，file:// 同源即可加载（无需额外标志）。
        tmp = basic_path / f"_equip_render_{secrets.token_hex(6)}.html"
        tmp.write_text(html, encoding="utf-8")
        try:
            await page.goto(tmp.as_uri(), wait_until="networkidle")
            # 视口高度收紧到内容实际高度，避免 full_page 截出多余空白
            height = await page.evaluate("document.documentElement.scrollHeight")
            await page.set_viewport_size({"width": width, "height": height})
            return await page.screenshot(full_page=True, type="png")
        finally:
            try:
                tmp.unlink()
            except OSError:
                pass


async def render_equipment_card(items: list[dict[str, Any]]) -> bytes:
    """把随机/组合出的战备渲染成一张 PNG 图（使用 nonebot_plugin_htmlrender）。"""
    html = _build_html(items)
    return await _html_to_png(html)