import React, { useId, useMemo, useState } from "react";
import CheckCircleIcon from "@mui/icons-material/CheckCircle";
import { Box, Button, Chip, Paper, Stack, Typography } from "@mui/material";

import { CvTheme, getVisibleCvThemes } from "../cvBuilder";
import { useI18n } from "../i18n/I18nProvider";
import CvTemplateThumbnail from "./CvTemplateThumbnail";

type Props = {
  themes: CvTheme[];
  selectedId: string;
  onSelect: (theme: CvTheme) => void;
  previewHeight?: number;
  showDescriptions?: boolean;
};

export default function CvTemplateGallery({ themes, selectedId, onSelect, previewHeight = 170, showDescriptions = true }: Props) {
  const { t } = useI18n();
  const id = useId();
  const [atsOnly, setAtsOnly] = useState(true);
  const visibleThemes = useMemo(() => getVisibleCvThemes(themes, atsOnly, selectedId), [atsOnly, selectedId, themes]);

  return (
    <Stack spacing={1.25}>
      <Stack direction="row" spacing={0.75} alignItems="center" flexWrap="wrap" useFlexGap>
        <Button size="small" aria-pressed={atsOnly} variant={atsOnly ? "contained" : "outlined"} onClick={() => setAtsOnly(true)}>{t("cvEditorAtsTemplates")}</Button>
        <Button size="small" aria-pressed={!atsOnly} variant={!atsOnly ? "contained" : "outlined"} onClick={() => setAtsOnly(false)}>{t("cvEditorAllTemplates")}</Button>
        {atsOnly && <Typography variant="caption" color="text.secondary">{t("cvEditorAtsTemplateHelp")}</Typography>}
      </Stack>
      <Box sx={{ display: "grid", gridTemplateColumns: "repeat(auto-fit, minmax(150px, 1fr))", gap: 1.25 }}>
        {visibleThemes.map((theme) => {
          const active = theme.id === selectedId;
          const locked = theme.available === false;
          return (
            <Paper key={theme.id} variant="outlined" role="button" tabIndex={locked ? -1 : 0} aria-label={theme.name} aria-describedby={`${id}-${theme.id}-category ${showDescriptions ? `${id}-${theme.id}-description ` : ""}${id}-${theme.id}-features`} aria-disabled={locked} aria-pressed={active}
              onClick={() => { if (!locked) onSelect(theme); }}
              onKeyDown={(event) => { if (!locked && (event.key === "Enter" || event.key === " ")) { event.preventDefault(); onSelect(theme); } }}
              sx={{ p: 1, cursor: locked ? "not-allowed" : "pointer", position: "relative", borderColor: active ? "primary.main" : "divider", borderWidth: active ? 2 : 1, "&:hover": locked ? undefined : { borderColor: "primary.main" } }}>
              {active && <CheckCircleIcon aria-label={t("cvEditorSelectedTemplate")} color="primary" sx={{ position: "absolute", zIndex: 2, top: 6, right: 6, bgcolor: "background.paper", borderRadius: "50%" }} />}
              <Box sx={{ mb: 1 }}><CvTemplateThumbnail theme={theme} height={previewHeight} /></Box>
              <Typography variant="body2" sx={{ fontWeight: 750 }}>{theme.name}</Typography>
              <Typography id={`${id}-${theme.id}-category`} variant="caption" color="text.secondary" sx={{ display: "block" }}>{theme.category}</Typography>
              {showDescriptions && <Typography id={`${id}-${theme.id}-description`} variant="caption" color="text.secondary" sx={{ display: "block", mt: 0.25, lineHeight: 1.35 }}>{theme.description}</Typography>}
              <Stack id={`${id}-${theme.id}-features`} direction="row" spacing={0.5} alignItems="center" flexWrap="wrap" useFlexGap sx={{ mt: 0.75 }}>
                {theme.atsFriendly && <Chip size="small" label={t("cvEditorAtsFriendly")} color="success" variant="outlined" sx={{ height: 20, fontSize: 10 }} />}
                {theme.requiresPro && <Chip size="small" label={locked ? t("cvEditorPro") : t("cvEditorProUnlocked")} color="secondary" variant="outlined" sx={{ height: 20, fontSize: 10 }} />}
                <Stack direction="row" spacing={0.35} sx={{ ml: "auto" }} aria-hidden>
                  {theme.swatches.slice(0, 3).map((colour, index) => <Box key={`${colour}-${index}`} sx={{ width: 10, height: 10, borderRadius: "50%", bgcolor: colour, border: "1px solid", borderColor: "divider" }} />)}
                </Stack>
              </Stack>
            </Paper>
          );
        })}
      </Box>
    </Stack>
  );
}