import { ModalContainer, ModalTitle, ModalContent, ButtonContainer } from "../modalwindows/style";
import { MainButton } from "../UI/buttons/mainButton";
import {useCallback, useEffect, useMemo, useState} from "react";
import styled, {useTheme} from "styled-components";
import {Setting, useSettingsStore} from "../../store/settings/settingsStore";
import {SettingItem} from "./SettingItem";
import {IconComponent} from "../../const/buttons/icons";
import {buttonNames} from "../../const/buttons/names";


interface Props {
    onClose: () => void;
}

const SectionsSidebar = styled.ul`
    display: flex;
    justify-content: start;
    align-items: start;
    flex-direction: column;
    gap: 4px;
    width: 20%;
    min-width: 180px;
    list-style-type: none;
    padding: 0;
    margin: 0;
`
const SectionsBTN = styled.li`
    font-size: 18px;
    border: none;
    cursor: pointer;
    width: 100%;
    padding:10px 16px;
    box-sizing: border-box;
    border-radius: 0 12px 12px 0;
    &.active{
        background-color: ${(props) => props.theme.accent};
        color: ${props => props.theme.primary};
    }
`
const SectionActive = styled.div`
    width: 80%;
`
const SectionLine = styled.span`
    height: 100%;
    width: 1px;
    background-color: #9D9D9D;
`
const CloseBtn = styled.span`
    cursor: pointer;
`
const SettingsButtons = styled.div`
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    span{
        display: flex;
        gap: 12px;
    }
`
export const Settings = ({ onClose }: Props) => {
    const settingsConfig = useSettingsStore(state => state.settingsConfig);
    const settingsValues = useSettingsStore(state => state.settingsValues);
    const activeSection = useSettingsStore(state => state.activeSection);
    const pendingChanges = useSettingsStore(state => state.pendingChanges);
    const setActiveSection = useSettingsStore(state => state.setActiveSection);
    const updateSetting = useSettingsStore(state => state.updateSetting);
    const applyChanges = useSettingsStore(state => state.applyChanges);
    const discardChanges = useSettingsStore(state => state.discardChanges);
    const getSetting = useSettingsStore(state => state.getSetting);
    const resetToDefaults = useSettingsStore(state => state.resetToDefaults);
    const initializeSettings = useSettingsStore(state => state.initializeSettings);

    const theme = useTheme()
    const [fieldErrors, setFieldErrors] = useState<Record<string, string>>({});

    // Проверка действий
    const handleValidationError = useCallback((fieldId: string, error: string | null) => {
        setFieldErrors(prev => {
            const newErrors = { ...prev };
            if (error) {
                newErrors[fieldId] = error;
            } else {
                delete newErrors[fieldId];
            }
            return newErrors;
        });
    }, []);

    const settingsBySection = useMemo(() => {
        return settingsConfig.reduce((acc, setting) => {
            if (!acc[setting.sectionId]) {
                acc[setting.sectionId] = [];
            }
            acc[setting.sectionId].push({
                ...setting,
                value: settingsValues[setting.id] ?? setting.defaultValue
            });
            return acc;
        }, {} as Record<string, Setting[]>);
    }, [settingsConfig, settingsValues]);

    const sections = useMemo(() => Object.keys(settingsBySection), [settingsBySection]);

    useEffect(() => {
        initializeSettings();
    }, [initializeSettings]);

    useEffect(() => {
        if (sections.length > 0 && !activeSection) {
            setActiveSection(sections[0]);
        }
    }, [sections, activeSection, setActiveSection]);

    const handleSave = useCallback(() => {
        const hasErrors = Object.values(fieldErrors).some(error => error?.trim());
        if (hasErrors) {
            alert('Исправьте ошибки перед сохранением');
            return;
        }

        const requiredFields = settingsConfig.filter(s => s.required);
        const emptyRequiredFields = requiredFields.filter(f => {
            const value = pendingChanges[f.id] ?? settingsValues[f.id] ?? f.defaultValue;
            return value == null || value === '';
        });

        if (emptyRequiredFields.length > 0) {
            alert('Заполните все обязательные поля');
            return;
        }

        applyChanges();
        onClose();
    }, [fieldErrors, settingsConfig, pendingChanges, settingsValues, applyChanges, onClose]);

    const handleCancel = useCallback(() => {
        discardChanges();
        setFieldErrors({});
        onClose();
    }, [discardChanges, onClose]);

    const handleReset = () => {
        if (window.confirm('Вы уверены, что хотите сбросить все настройки к значениям по умолчанию?')) {
            resetToDefaults();
        }
    };

    // Обработка нажатий клавиш
    useEffect(() => {
        const handleKeyPress = (e: React.KeyboardEvent<HTMLElement>) => {
            if (e.key === 'Enter')
                handleSave();
            if (e.key === 'Escape')
                handleCancel()
        };
        document.addEventListener('keydown', handleKeyPress);
        return () => {
            document.removeEventListener('keydown', handleKeyPress);
        };
    }, []);

    return (
        <ModalContainer style={{ height: '60vh', width: '50vw', minWidth: "800px" }}>
            <ModalTitle>
                <h3>Настройки</h3>
                <CloseBtn>
                    <IconComponent name={buttonNames[12]} width="30" height="30" onClick={handleCancel} />
                </CloseBtn>
            </ModalTitle>

            <ModalContent style={{ display: 'flex', height:"100%", gap: '24px', padding:0 }}>
                <SectionsSidebar>
                    {sections.map((sectionId) => (
                        <SectionsBTN
                            key={sectionId}
                            className={activeSection === sectionId ? 'active' : ''}
                            onClick={()=>setActiveSection(sectionId)}
                        >
                            {sectionId}
                        </SectionsBTN>
                    ))}
                </SectionsSidebar>
                <SectionLine/>
                <SectionActive>
                    {activeSection && settingsBySection[activeSection] && (
                        <>
                            {settingsBySection[activeSection].map((setting) => (
                                <SettingItem
                                    key={setting.id}
                                    setting={setting}
                                    value={getSetting(setting.id).currentValue}
                                    onValidationError={(error) => handleValidationError(setting.id, error)}
                                    onChange={(value) => updateSetting(setting.id, value)}
                                />
                            ))}
                        </>
                    )}
                </SectionActive>
            </ModalContent>

            <ButtonContainer>
                <SettingsButtons>
                    <MainButton
                        type="button"
                        size="small"
                        title='Сбросить настройки'
                        onClick={handleReset}
                        color={theme.offlineColor}
                        hoverColor={theme.borderColor}
                    />
                    <span>
                        <MainButton
                            type="button"
                            size="small"
                            title='Отменить'
                            onClick={handleCancel}
                            color={theme.offlineColor}
                            hoverColor={theme.borderColor}
                        />
                        <MainButton
                            type="button"
                            size="small"
                            title='Сохранить'
                            onClick={handleSave}
                        />
                    </span>
                </SettingsButtons>
            </ButtonContainer>
        </ModalContainer>
    );
};