import { Trans, useLingui } from "@lingui/react/macro";
import { Button, Input, Spinner } from "@rakazo/ui-web";
import { Check, ExternalLink, GitBranch, Lock, RefreshCw, Search, X } from "lucide-react";
import { useCallback, useEffect, useId, useMemo, useState } from "react";
import { rpc } from "../lib/rpc";

export interface GithubRepoItem {
  name: string;
  fullName: string;
  url: string;
  description?: string | null;
  isPrivate: boolean;
  updatedAt?: string;
}

export interface GithubRepoPickerProps {
  value: string;
  onChange: (url: string, repo?: { name: string; fullName: string }) => void;
  onSuggestProjectName?: (name: string) => void;
  onSuggestWorkspacePath?: (path: string) => void;
  disabled?: boolean;
}

function GithubMark({ className }: { className?: string }) {
  return (
    <svg viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" className={className}>
      <path d="M12 .3a12 12 0 0 0-3.8 23.4c.6.1.8-.3.8-.6v-2.2c-3.3.7-4-1.4-4-1.4-.6-1.4-1.4-1.8-1.4-1.8-1-.7.1-.7.1-.7 1.2.1 1.8 1.2 1.8 1.2 1 1.8 2.8 1.3 3.5 1 0-.8.4-1.3.7-1.6-2.7-.3-5.5-1.3-5.5-6 0-1.2.5-2.3 1.3-3.1-.2-.4-.6-1.6 0-3.2 0 0 1-.3 3.4 1.2a11.5 11.5 0 0 1 6 0c2.3-1.5 3.3-1.2 3.3-1.2.6 1.6.2 2.8.1 3.2.8.8 1.2 1.9 1.2 3.1 0 4.6-2.8 5.6-5.5 5.9.5.4.9 1.1.9 2.2v3.3c0 .3.1.7.8.6A12 12 0 0 0 12 .3" />
    </svg>
  );
}

export function GithubRepoPicker({
  value,
  onChange,
  onSuggestProjectName,
  onSuggestWorkspacePath,
  disabled = false,
}: GithubRepoPickerProps) {
  const { t } = useLingui();
  const searchId = useId();
  const manualId = useId();

  const [connected, setConnected] = useState<boolean | null>(null);
  const [username, setUsername] = useState<string | undefined>(undefined);
  const [repos, setRepos] = useState<GithubRepoItem[]>([]);
  const [loading, setLoading] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");
  const [showManualInput, setShowManualInput] = useState(false);

  const fetchRepos = useCallback(async () => {
    setLoading(true);
    try {
      const res = await rpc.spaces.listGithubRepos({ limit: 100 });
      setConnected(res.connected);
      setUsername(res.username);
      setRepos(res.repos);
      if (!res.connected && !value) {
        setShowManualInput(true);
      }
    } catch {
      setConnected(false);
      setShowManualInput(true);
    } finally {
      setLoading(false);
    }
  }, [value]);

  useEffect(() => {
    void fetchRepos();
  }, [fetchRepos]);

  const filteredRepos = useMemo(() => {
    if (!searchQuery.trim()) return repos;
    const q = searchQuery.trim().toLowerCase();
    return repos.filter(
      (r) =>
        r.name.toLowerCase().includes(q) ||
        r.fullName.toLowerCase().includes(q) ||
        (r.description && r.description.toLowerCase().includes(q)),
    );
  }, [repos, searchQuery]);

  const handleSelectRepo = (repo: GithubRepoItem) => {
    onChange(repo.url, { name: repo.name, fullName: repo.fullName });
    if (onSuggestProjectName) {
      onSuggestProjectName(repo.name);
    }
    if (onSuggestWorkspacePath) {
      onSuggestWorkspacePath(`~/Projects/${repo.name}`);
    }
  };

  const selectedRepo = useMemo(() => {
    if (!value) return null;
    return (
      repos.find(
        (r) =>
          r.url.toLowerCase() === value.toLowerCase() ||
          r.url.replace(/\.git$/, "").toLowerCase() === value.replace(/\.git$/, "").toLowerCase(),
      ) ?? null
    );
  }, [repos, value]);

  return (
    <div className="space-y-2">
      <div className="flex items-center justify-between text-ui-body-sm">
        <div className="flex items-center gap-1.5 text-foreground/80 font-medium">
          <GithubMark className="size-4 text-foreground shrink-0" />
          <span>
            <Trans>GitHub repository</Trans>
          </span>
          <span className="text-ui-body-xs text-muted-foreground font-normal">
            <Trans>(optional)</Trans>
          </span>
        </div>

        {connected ? (
          <div className="flex items-center gap-2">
            <span className="inline-flex items-center gap-1 rounded-full bg-muted/60 px-2 py-0.5 text-ui-body-xs text-muted-foreground">
              <span className="size-1.5 rounded-full bg-emerald-500" />
              {username ? `@${username}` : t`Connected`}
            </span>
            <button
              type="button"
              onClick={() => setShowManualInput(!showManualInput)}
              className="text-ui-body-xs text-muted-foreground hover:text-foreground underline underline-offset-2"
            >
              {showManualInput ? t`Show list` : t`Manual URL`}
            </button>
          </div>
        ) : connected === false ? (
          <div className="flex items-center gap-1.5">
            <Button
              type="button"
              variant="ghost"
              size="icon-sm"
              aria-label={t`Refresh GitHub`}
              onClick={() => void fetchRepos()}
              disabled={loading}
              className="size-6 text-muted-foreground hover:text-foreground"
            >
              <RefreshCw size={13} className={loading ? "animate-spin" : undefined} />
            </Button>
          </div>
        ) : null}
      </div>

      {showManualInput || connected === false ? (
        <div className="flex gap-2">
          <Input
            id={manualId}
            value={value}
            disabled={disabled}
            onChange={(e) => onChange(e.target.value)}
            placeholder="https://github.com/organization/repository"
            spellCheck={false}
            className="text-ui-body-sm"
          />
          {value ? (
            <Button
              type="button"
              variant="ghost"
              size="icon-sm"
              aria-label={t`Clear repository`}
              onClick={() => onChange("")}
              className="shrink-0 size-9 text-muted-foreground hover:text-foreground"
            >
              <X size={16} strokeWidth={1.8} />
            </Button>
          ) : null}
        </div>
      ) : null}

      {connected && !showManualInput ? (
        <div className="space-y-1.5">
          {/* Active selection banner if a repo is currently selected */}
          {selectedRepo ? (
            <div className="flex items-center justify-between px-3 py-2 rounded-lg border border-primary/40 bg-primary/5 text-ui-body-sm">
              <div className="flex items-center gap-2 min-w-0 flex-1">
                {selectedRepo.isPrivate ? (
                  <Lock size={14} className="text-muted-foreground shrink-0" />
                ) : (
                  <GitBranch size={14} className="text-muted-foreground shrink-0" />
                )}
                <span className="font-medium text-foreground truncate">
                  {selectedRepo.fullName}
                </span>
              </div>
              <div className="flex items-center gap-1.5 shrink-0 ml-2">
                <Button
                  type="button"
                  variant="ghost"
                  size="icon-sm"
                  aria-label={t`Clear selected repository`}
                  onClick={() => onChange("")}
                  className="size-6 text-muted-foreground hover:text-foreground"
                >
                  <X size={14} strokeWidth={2} />
                </Button>
              </div>
            </div>
          ) : null}

          {/* Mini-search input */}
          <div className="relative">
            <Search
              size={14}
              strokeWidth={2}
              className="absolute left-2.5 top-1/2 -translate-y-1/2 text-muted-foreground"
            />
            <Input
              id={searchId}
              value={searchQuery}
              onChange={(e) => setSearchQuery(e.target.value)}
              placeholder={t`Search repositories...`}
              disabled={disabled || loading}
              className="pl-8 h-8 text-ui-body-sm"
            />
            {loading ? (
              <div className="absolute right-2.5 top-1/2 -translate-y-1/2">
                <Spinner className="size-3.5 text-muted-foreground" />
              </div>
            ) : null}
          </div>

          {/* Repositories list */}
          <div className="max-h-44 overflow-y-auto rounded-lg border border-border bg-card divide-y divide-border/30">
            {loading && repos.length === 0 ? (
              <div className="flex items-center justify-center py-6 text-muted-foreground">
                <Spinner className="size-4 text-muted-foreground" />
              </div>
            ) : filteredRepos.length === 0 ? (
              <div className="py-6 text-center text-ui-body-sm text-muted-foreground">
                {searchQuery ? (
                  <Trans>No matching repositories</Trans>
                ) : (
                  <Trans>No repositories found</Trans>
                )}
              </div>
            ) : (
              filteredRepos.map((repo) => {
                const isSelected =
                  value.toLowerCase() === repo.url.toLowerCase() ||
                  value.replace(/\.git$/, "").toLowerCase() ===
                    repo.url.replace(/\.git$/, "").toLowerCase();
                return (
                  <button
                    key={repo.fullName}
                    type="button"
                    disabled={disabled}
                    onClick={() => handleSelectRepo(repo)}
                    className={`w-full flex items-start gap-2.5 px-3 py-2 text-left transition-colors ${
                      isSelected
                        ? "bg-primary text-primary-foreground font-medium"
                        : "hover:bg-muted text-foreground"
                    }`}
                  >
                    <div className="pt-0.5 shrink-0">
                      {repo.isPrivate ? (
                        <Lock
                          size={14}
                          strokeWidth={1.8}
                          className={
                            isSelected ? "text-primary-foreground" : "text-muted-foreground"
                          }
                        />
                      ) : (
                        <GitBranch
                          size={14}
                          strokeWidth={1.8}
                          className={
                            isSelected ? "text-primary-foreground" : "text-muted-foreground"
                          }
                        />
                      )}
                    </div>
                    <div className="min-w-0 flex-1">
                      <div className="flex items-center justify-between gap-1">
                        <span className="truncate text-ui-body-sm font-medium">
                          {repo.fullName}
                        </span>
                        {isSelected ? (
                          <Check size={14} strokeWidth={2.5} className="shrink-0" />
                        ) : null}
                      </div>
                      {repo.description ? (
                        <p
                          className={`truncate text-ui-body-xs mt-0.5 ${
                            isSelected ? "text-primary-foreground/80" : "text-muted-foreground"
                          }`}
                        >
                          {repo.description}
                        </p>
                      ) : null}
                    </div>
                  </button>
                );
              })
            )}
          </div>
        </div>
      ) : null}
    </div>
  );
}