/**
 * Terminal Search Bar
 * Provides search functionality within terminal scrollback buffer
 */
import { ChevronUp, ChevronDown, Search } from 'lucide-react';
import React, { useState, useRef, useEffect, useCallback } from 'react';
import { useI18n } from '../../application/i18n/I18nProvider';
import { Button } from '../ui/button';
import { Tooltip, TooltipContent, TooltipTrigger } from '../ui/tooltip';

export interface TerminalSearchBarProps {
    isOpen: boolean;
    /**
     * Incremented each time the search hotkey fires while the bar is already
     * open. Watched by the focus effect so Cmd/Ctrl+F re-grabs focus when it
     * has moved elsewhere (issue #1789). Ignored while `isOpen` is false.
     */
    focusToken?: number;
    onClose: () => void;
    onSearch: (term: string) => boolean;
    onFindNext: () => boolean;
    onFindPrevious: () => boolean;
    matchCount?: { current: number; total: number } | null;
}

export const notifyTerminalSearchTermChange = (
    searchTerm: string,
    previousSearchTerm: string,
    onSearch: (term: string) => boolean,
): string => {
    if (searchTerm === previousSearchTerm) return previousSearchTerm;
    onSearch(searchTerm);
    return searchTerm;
};

export const TerminalSearchBar: React.FC<TerminalSearchBarProps> = ({
    isOpen,
    focusToken,
    onClose,
    onSearch,
    onFindNext,
    onFindPrevious,
    matchCount,
}) => {
    const { t } = useI18n();
    const [searchTerm, setSearchTerm] = useState('');
    const inputRef = useRef<HTMLInputElement>(null);
    const prevSearchTermRef = useRef('');

    // Focus input when opened, or when the search hotkey re-fires while open
    // (focusToken bumps) so focus returns to the input after it moved elsewhere.
    useEffect(() => {
        if (isOpen && inputRef.current) {
            inputRef.current.focus();
            inputRef.current.select();
        }
    }, [isOpen, focusToken]);

    // Trigger search when term changes. When the term is cleared we still call
    // onSearch('') so the underlying search addon clears its highlights;
    // otherwise the last match decorations linger after emptying the input.
    useEffect(() => {
        prevSearchTermRef.current = notifyTerminalSearchTermChange(
            searchTerm,
            prevSearchTermRef.current,
            onSearch,
        );
    }, [searchTerm, onSearch]);

    const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
        if (e.key === 'Escape') {
            e.preventDefault();
            onClose();
        } else if (e.key === 'Enter') {
            e.preventDefault();
            if (e.shiftKey) {
                onFindPrevious();
            } else {
                onFindNext();
            }
        } else if (e.key === 'F3' || (e.key === 'g' && (e.ctrlKey || e.metaKey))) {
            e.preventDefault();
            if (e.shiftKey) {
                onFindPrevious();
            } else {
                onFindNext();
            }
        }
    }, [onClose, onFindNext, onFindPrevious]);

    if (!isOpen) return null;

    return (
        <div
            className="flex items-center gap-1.5 px-2 pt-0 pb-2 bg-black/50 backdrop-blur-sm"
            style={{
                backgroundColor: 'color-mix(in srgb, var(--terminal-ui-bg, #000000) 86%, transparent)',
            }}
            onClick={(e) => e.stopPropagation()}
            onMouseDown={(e) => e.stopPropagation()}
        >
            {/* Search input */}
            <div className="relative flex-1">
                <Search
                    size={12}
                    className="absolute left-2 top-1/2 -translate-y-1/2"
                    style={{ color: 'color-mix(in srgb, var(--terminal-ui-fg, #ffffff) 40%, transparent)' }}
                />
                <input
                    ref={inputRef}
                    type="text"
                    value={searchTerm}
                    onChange={(e) => setSearchTerm(e.target.value)}
                    onKeyDown={handleKeyDown}
                    onClick={(e) => e.stopPropagation()}
                    onMouseDown={(e) => e.stopPropagation()}
                    data-terminal-search-input=""
                    placeholder={t("terminal.search.placeholder")}
                    className="w-full h-6 pl-7 pr-2 text-[11px] border-none rounded placeholder:opacity-40 focus:outline-none"
                    style={{
                        backgroundColor: 'color-mix(in srgb, var(--terminal-ui-fg, #ffffff) 5%, transparent)',
                        color: 'var(--terminal-ui-fg, #ffffff)',
                    }}
                />
            </div>

            {/* Match count indicator - only show when no results */}
            {searchTerm.length > 0 && matchCount?.total === 0 && (
                <span
                    className="text-[10px] flex-shrink-0"
                    style={{ color: 'color-mix(in srgb, var(--terminal-ui-fg, #ffffff) 50%, transparent)' }}
                >
                    {t("terminal.search.noResults")}
                </span>
            )}

            {/* Navigation buttons */}
            <div className="flex items-center gap-0.5 flex-shrink-0">
                <Tooltip>
                    <TooltipTrigger asChild>
                        <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="h-6 w-6 disabled:opacity-30"
                            style={{
                                color: 'color-mix(in srgb, var(--terminal-ui-fg, #ffffff) 60%, transparent)',
                            }}
                            onClick={(e) => {
                                e.preventDefault();
                                e.stopPropagation();
                                onFindPrevious();
                            }}
                            onMouseDown={(e) => e.stopPropagation()}
                            onKeyDown={(e) => e.stopPropagation()}
                            disabled={!searchTerm}
                            tabIndex={-1}
                        >
                            <ChevronUp size={14} />
                        </Button>
                    </TooltipTrigger>
                    <TooltipContent>{t("terminal.search.prevMatch")}</TooltipContent>
                </Tooltip>
                <Tooltip>
                    <TooltipTrigger asChild>
                        <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="h-6 w-6 disabled:opacity-30"
                            style={{
                                color: 'color-mix(in srgb, var(--terminal-ui-fg, #ffffff) 60%, transparent)',
                            }}
                            onClick={(e) => {
                                e.preventDefault();
                                e.stopPropagation();
                                onFindNext();
                            }}
                            onMouseDown={(e) => e.stopPropagation()}
                            onKeyDown={(e) => e.stopPropagation()}
                            disabled={!searchTerm}
                            tabIndex={-1}
                        >
                            <ChevronDown size={14} />
                        </Button>
                    </TooltipTrigger>
                    <TooltipContent>{t("terminal.search.nextMatch")}</TooltipContent>
                </Tooltip>
            </div>
        </div>
    );
};