from __future__ import annotations

from pathlib import Path

from fastapi import APIRouter, Response
from fastapi.responses import FileResponse, RedirectResponse

from ..web.styles import ADMIN_CSS, BASE_CSS

ASSET_DIR = Path(__file__).parents[1] / "assets"
router = APIRouter(include_in_schema=False)
ASSET_CACHE_HEADERS = {"Cache-Control": "public, max-age=31536000, immutable"}

THEME_JS = """
(() => {
  const media = window.matchMedia("(prefers-color-scheme: dark)");
  const storageKey = "karldns-theme";
  const systemTheme = () => (media.matches ? "dark" : "light");
  const storedTheme = () => {
    try {
      return window.localStorage.getItem(storageKey);
    } catch (_) {
      return null;
    }
  };
  const setStoredTheme = (theme) => {
    try {
      window.localStorage.setItem(storageKey, theme);
    } catch (_) {}
  };
  const syncToggle = (theme) => {
    document.querySelectorAll("[data-theme-toggle]").forEach((button) => {
      const nextTheme = theme === "dark" ? "light" : "dark";
      button.dataset.themeNext = nextTheme;
      button.setAttribute("aria-label", `Switch to ${nextTheme.toLowerCase()} theme`);
    });
  };
  const applyTheme = (requestedTheme = storedTheme() || systemTheme()) => {
    const theme = requestedTheme === "dark" ? "dark" : "light";
    document.documentElement.setAttribute("data-bs-theme", theme);
    syncToggle(theme);
    return theme;
  };
  applyTheme();
  media.addEventListener("change", () => {
    if (!storedTheme()) applyTheme();
  });
  document.addEventListener("DOMContentLoaded", () => syncToggle(document.documentElement.getAttribute("data-bs-theme") || "light"));
  document.addEventListener("click", (event) => {
    const toggle = event.target.closest("[data-theme-toggle]");
    if (!toggle) return;
    const currentTheme = document.documentElement.getAttribute("data-bs-theme") || systemTheme();
    const nextTheme = currentTheme === "dark" ? "light" : "dark";
    setStoredTheme(nextTheme);
    applyTheme(nextTheme);
  });
})();
""".strip()


CLIPBOARD_JS = """
document.addEventListener("click", async (event) => {
  document.querySelectorAll("details.copy-menu[open]").forEach((menu) => {
    if (!menu.contains(event.target)) menu.removeAttribute("open");
  });

  const toggle = event.target.closest("[data-secret-toggle]");
  if (toggle) {
    const group = toggle.closest(".copy-field");
    const field = group ? group.querySelector("[data-secret-input], [data-secret-value]") : null;
    if (!field) return;
    if (field.matches("[data-secret-input]")) {
      const masked = field.type === "password";
      field.type = masked ? "text" : "password";
      toggle.textContent = masked ? "Hide" : "View";
      toggle.setAttribute("aria-label", masked ? "Hide secret value" : "Show secret value");
    } else {
      const masked = field.dataset.secretMasked !== "false";
      field.dataset.secretMasked = masked ? "false" : "true";
      field.textContent = masked ? (field.dataset.secretValue || "") : "********";
      toggle.textContent = masked ? "Hide" : "View";
      toggle.setAttribute("aria-label", masked ? "Hide secret value" : "Show secret value");
    }
    return;
  }

  const button = event.target.closest("[data-copy]");
  if (!button) return;
  try {
    await navigator.clipboard.writeText(button.dataset.copy || "");
    const label = button.querySelector("[data-copy-label]");
    const oldLabel = label ? label.textContent : "";
    button.classList.add("is-copied");
    if (label) label.textContent = "Copied";
    const menu = button.closest("details.copy-menu");
    if (menu) {
      setTimeout(() => {
        menu.removeAttribute("open");
      }, 250);
    }
    setTimeout(() => {
      button.classList.remove("is-copied");
      if (label) label.textContent = oldLabel;
    }, 1200);
  } catch (_) {}
});

document.addEventListener("keydown", (event) => {
  if (event.key !== "Escape") return;
  document.querySelectorAll("details.copy-menu[open]").forEach((menu) => {
    menu.removeAttribute("open");
  });
});
""".strip()


ADMIN_TABLES_JS = """
document.querySelectorAll("[data-admin-table]").forEach((tableShell) => {
  const table = tableShell.querySelector("table");
  const tbody = tableShell.querySelector("tbody");
  const search = tableShell.querySelector("[data-table-search]");
  const pageSize = tableShell.querySelector("[data-table-page-size]");
  const count = tableShell.querySelector("[data-table-count]");
  const pagination = tableShell.querySelector("[data-table-pagination]");
  if (!table || !tbody || !search || !pageSize || !count || !pagination) return;

  const headerCount = table.querySelectorAll("thead th").length || 1;
  const originalRows = Array.from(tbody.querySelectorAll("tr"));
  const dataRows = originalRows.filter((row) => !row.classList.contains("empty-row"));
  let currentPage = 1;

  const emptyRow = (message) => {
    const row = document.createElement("tr");
    row.className = "empty-row";
    const cell = document.createElement("td");
    cell.className = "empty";
    cell.colSpan = headerCount;
    cell.textContent = message;
    row.append(cell);
    return row;
  };

  const visibleRows = () => {
    const query = search.value.trim().toLowerCase();
    if (!query) return dataRows;
    return dataRows.filter((row) => row.textContent.toLowerCase().includes(query));
  };

  const renderButton = (label, page, disabled = false, active = false) => {
    const item = document.createElement("li");
    item.className = `page-item${disabled ? " disabled" : ""}${active ? " active" : ""}`;
    const button = document.createElement("button");
    button.type = "button";
    button.className = "page-link";
    button.textContent = label;
    button.disabled = disabled;
    button.addEventListener("click", () => {
      currentPage = page;
      render();
    });
    item.append(button);
    return item;
  };

  const renderPagination = (totalPages) => {
    pagination.replaceChildren();
    if (totalPages <= 1) return;
    pagination.append(renderButton("Previous", Math.max(1, currentPage - 1), currentPage === 1));
    for (let page = 1; page <= totalPages; page += 1) {
      if (totalPages > 7 && page !== 1 && page !== totalPages && Math.abs(page - currentPage) > 1) {
        if (page === 2 || page === totalPages - 1) pagination.append(renderButton("...", currentPage, true));
        continue;
      }
      pagination.append(renderButton(String(page), page, false, page === currentPage));
    }
    pagination.append(renderButton("Next", Math.min(totalPages, currentPage + 1), currentPage === totalPages));
  };

  const render = () => {
    const rows = visibleRows();
    const size = Number.parseInt(pageSize.value, 10) || 25;
    const totalPages = Math.max(1, Math.ceil(rows.length / size));
    currentPage = Math.min(currentPage, totalPages);
    const start = (currentPage - 1) * size;
    const pageRows = rows.slice(start, start + size);
    tbody.replaceChildren(...(pageRows.length ? pageRows : [emptyRow(dataRows.length ? "No matching rows." : "No rows yet.")]));
    const shownStart = rows.length ? start + 1 : 0;
    const shownEnd = rows.length ? Math.min(start + size, rows.length) : 0;
    count.textContent = `${shownStart}-${shownEnd} of ${rows.length}`;
    renderPagination(totalPages);
  };

  search.addEventListener("input", () => {
    currentPage = 1;
    render();
  });
  pageSize.addEventListener("change", () => {
    currentPage = 1;
    render();
  });
  render();
});
""".strip()


def _minify_css(css: str) -> str:
    return " ".join(css.split()).replace(" {", "{").replace("{ ", "{").replace("; ", ";").replace(": ", ":").replace(", ", ",").replace(" }", "}").replace(";}", "}")


MINIFIED_BASE_CSS = _minify_css(BASE_CSS)
MINIFIED_ADMIN_CSS = _minify_css(ADMIN_CSS)


@router.get("/favicon.ico")
def favicon() -> FileResponse:
    return FileResponse(ASSET_DIR / "favicon.ico", media_type="image/x-icon", headers=ASSET_CACHE_HEADERS)

@router.get("/bootstrap-subset.css")
def bootstrap_subset_css() -> FileResponse:
    return FileResponse(ASSET_DIR / "bootstrap-subset.css", media_type="text/css", headers=ASSET_CACHE_HEADERS)

@router.get("/favicon-16x16.png")
def favicon_16_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "favicon-16x16.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/favicon-32x32.png")
def favicon_32_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "favicon-32x32.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/apple-touch-icon.png")
def apple_touch_icon_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "apple-touch-icon.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/logo.png")
def logo_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "logo.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/logo.webp")
def logo_webp() -> FileResponse:
    return FileResponse(ASSET_DIR / "logo.webp", media_type="image/webp", headers=ASSET_CACHE_HEADERS)

@router.get("/logo-nav.webp")
def logo_nav_webp() -> FileResponse:
    return FileResponse(ASSET_DIR / "logo-nav.webp", media_type="image/webp", headers=ASSET_CACHE_HEADERS)

@router.get("/logo-192.png")
def logo_192_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "logo-192.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/logo-512.png")
def logo_512_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "logo-512.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/social-preview.png")
def social_preview_png() -> FileResponse:
    return FileResponse(ASSET_DIR / "social-preview.png", media_type="image/png", headers=ASSET_CACHE_HEADERS)

@router.get("/social-preview.webp")
def social_preview_webp() -> FileResponse:
    return FileResponse(ASSET_DIR / "social-preview.webp", media_type="image/webp", headers=ASSET_CACHE_HEADERS)

@router.get("/site.webmanifest")
def site_webmanifest() -> Response:
    return Response(
        """
{
  "name": "KarlDNS",
  "short_name": "KarlDNS",
  "description": "Private update links for routers.",
  "start_url": "/",
  "scope": "/",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#ffffff",
  "icons": [
    {"src": "/logo-192.png", "sizes": "192x192", "type": "image/png"},
    {"src": "/logo-512.png", "sizes": "512x512", "type": "image/png"}
  ]
}
        """.strip(),
        media_type="application/manifest+json",
        headers=ASSET_CACHE_HEADERS,
    )

@router.get("/theme.js")
def theme_js() -> Response:
    return Response(THEME_JS, media_type="application/javascript", headers=ASSET_CACHE_HEADERS)


@router.get("/clipboard.js")
def clipboard_js() -> Response:
    return Response(CLIPBOARD_JS, media_type="application/javascript", headers=ASSET_CACHE_HEADERS)


@router.get("/admin-tables.js")
def admin_tables_js() -> Response:
    return Response(ADMIN_TABLES_JS, media_type="application/javascript", headers=ASSET_CACHE_HEADERS)


@router.get("/app.css")
def app_css() -> Response:
    return Response(MINIFIED_BASE_CSS, media_type="text/css", headers=ASSET_CACHE_HEADERS)


@router.get("/admin.css")
def admin_css() -> Response:
    return Response(MINIFIED_ADMIN_CSS, media_type="text/css", headers=ASSET_CACHE_HEADERS)


@router.get("/install.sh")
def install_sh() -> RedirectResponse:
    return RedirectResponse(
        "https://raw.githubusercontent.com/StasonJatham/karldns.de/main/scripts/install-linux.sh",
        status_code=302,
    )


@router.get("/uninstall.sh")
def uninstall_sh() -> RedirectResponse:
    return RedirectResponse(
        "https://raw.githubusercontent.com/StasonJatham/karldns.de/main/scripts/uninstall-linux.sh",
        status_code=302,
    )