import React, { ReactNode, useCallback, useEffect, useMemo, useState, useRef } from "react";
import { FaEye, FaFileUpload } from "react-icons/fa";
import clsx from "clsx";
import Select from "@/components/Low/Select";
import Input from "@/components/Low/Input";
import AutoExpandingTextArea from "@/components/Low/AutoExpandingTextarea";
import Option from '@/interfaces/option'
import Dropdown from "./Shared/SettingsDropdown";
import useSettingsState from "../Hooks/useSettingsState";
import { Module } from "@/interfaces";
import { SectionSettings } from "@/stores/examEditor/types";
import useExamEditorStore from "@/stores/examEditor";

interface SettingsEditorProps {
    sectionId: number,
    sectionLabel: string;
    module: Module,
    introPresets: Option[];
    children?: ReactNode;
    canPreview: boolean;
    canSubmit: boolean;
    submitModule: (requiresApproval: boolean) => void;
    preview: () => void;
}

const SettingsEditor: React.FC<SettingsEditorProps> = ({
    sectionId,
    sectionLabel,
    module,
    introPresets,
    children,
    preview,
    submitModule,
    canPreview,
    canSubmit
}) => {
    const { dispatch } = useExamEditorStore()
    const examLabel = useExamEditorStore((state) => state.modules[module].examLabel) || '';
    const type = useExamEditorStore((s) => s.modules[module].type);
    const { localSettings, updateLocalAndScheduleGlobal } = useSettingsState<SectionSettings>(
        module,
        sectionId
    );

    const options = useMemo(() => [
        { value: 'None', label: 'None' },
        ...introPresets,
        { value: 'Custom', label: 'Custom' }
    ], [introPresets]);

    const onCategoryChange = useCallback((text: string) => {
        updateLocalAndScheduleGlobal({ category: text });
    }, [updateLocalAndScheduleGlobal]);

    const typeOptions = [
        { value: 'general', label: 'General' },
        { value: 'academic', label: 'Academic' }
    ];

    const onTypeChange = useCallback((option: { value: string | null, label: string }) => {
        dispatch({
            type: 'UPDATE_MODULE',
            payload: { module, updates: { type: option.value as "academic" | "general" | undefined } }
        });
    }, [dispatch, module]);

    const onIntroOptionChange = useCallback((option: { value: string | null, label: string }) => {
        let updates: Partial<SectionSettings> = { introOption: option };

        switch (option.label) {
            case 'None':
                updates.currentIntro = undefined;
                break;
            case 'Custom':
                updates.currentIntro = localSettings.customIntro;
                break;
            default:
                const selectedPreset = introPresets.find(preset => preset.label === option.label);
                if (selectedPreset) {
                    updates.currentIntro = selectedPreset.value!
                        .replace('{part}', sectionLabel)
                        .replace('{label}', examLabel);
                }
        }

        updateLocalAndScheduleGlobal(updates);
    }, [updateLocalAndScheduleGlobal, localSettings.customIntro, introPresets, sectionLabel, examLabel]);

    const onCustomIntroChange = useCallback((text: string) => {
        updateLocalAndScheduleGlobal({
            introOption: { value: 'Custom', label: 'Custom' },
            customIntro: text,
            currentIntro: text
        });
    }, [updateLocalAndScheduleGlobal]);

    return (
        <div className={`flex flex-col gap-8 border bg-ielts-${module}/20 rounded-3xl p-8 w-1/3 h-fit -2xl:w-full`}>
            <div className={`w-full flex justify-center text-ielts-${module} font-bold text-xl`}>{sectionLabel} Settings</div>
            <div className="flex flex-col gap-4">
                <Dropdown
                    title="Category"
                    module={module}
                    open={localSettings.isCategoryDropdownOpen}
                    setIsOpen={(isOpen: boolean) => updateLocalAndScheduleGlobal({ isCategoryDropdownOpen: isOpen }, false)}
                >
                    <Input
                        key={`section-${sectionId}`}
                        type="text"
                        placeholder="Category"
                        name="category"
                        onChange={onCategoryChange}
                        roundness="full"
                        value={localSettings.category || ''}
                    />
                </Dropdown>
                {["reading", "writing"].includes(module) && <Dropdown
                    title="Type"
                    module={module}
                    open={localSettings.isTypeDropdownOpen}
                    setIsOpen={(isOpen: boolean) => updateLocalAndScheduleGlobal({ isTypeDropdownOpen: isOpen }, false)}
                >
                    <Select
                        options={typeOptions}
                        onChange={(o) => onTypeChange({ value: o!.value, label: o!.label })}
                        value={typeOptions.find(o => o.value === type)}
                    />
                </Dropdown>}
                <Dropdown
                    title="Divider"
                    module={module}
                    open={localSettings.isIntroDropdownOpen}
                    setIsOpen={(isOpen: boolean) => updateLocalAndScheduleGlobal({ isIntroDropdownOpen: isOpen }, false)}
                >
                    <div className="flex flex-col gap-3 w-full">
                        <Select
                            options={options}
                            onChange={(o) => onIntroOptionChange({ value: o!.value, label: o!.label })}
                            value={localSettings.introOption}
                        />
                        {localSettings.introOption && localSettings.introOption.value !== "None" && (
                            <AutoExpandingTextArea
                                key={`section-${sectionId}`}
                                value={localSettings.currentIntro || ''}
                                onChange={onCustomIntroChange}
                            />
                        )}
                    </div>
                </Dropdown>
                {children}
                <div className="flex flex-col gap-3 mt-4">
                    <button
                        className={clsx(
                            "flex items-center justify-center px-4 py-2 text-white rounded-xl transition-colors duration-300",
                            `bg-ielts-${module}/70 border border-ielts-${module} hover:bg-ielts-${module} disabled:bg-ielts-${module}/30`,
                            "disabled:cursor-not-allowed disabled:text-gray-200"
                        )}
                        onClick={() => submitModule(true)}
                        disabled={!canSubmit}
                    >
                        <FaFileUpload className="mr-2" size={18} />
                        Submit module as exam for approval
                    </button>
                    <button
                        className={clsx(
                            "flex items-center justify-center px-4 py-2 text-white rounded-xl transition-colors duration-300",
                            `bg-ielts-${module}/70 border border-ielts-${module} hover:bg-ielts-${module} disabled:bg-ielts-${module}/30`,
                            "disabled:cursor-not-allowed disabled:text-gray-200"
                        )}
                        onClick={() => {
                            if (!confirm(`Are you sure you want to skip the approval process for this exam?`)) return;
                            submitModule(false);
                        }}
                        disabled={!canSubmit}
                    >
                        <FaFileUpload className="mr-2" size={18} />
                        Submit module as exam and skip approval process
                    </button>
                    <button
                        className={clsx(
                            "flex items-center justify-center px-4 py-2 text-white rounded-xl transition-colors duration-300",
                            `bg-ielts-${module}/70 border border-ielts-${module} hover:bg-ielts-${module} disabled:bg-ielts-${module}/30`,
                            "disabled:cursor-not-allowed disabled:text-gray-200"
                        )}
                        onClick={preview}
                        disabled={!canPreview}
                    >
                        <FaEye className="mr-2" size={18} />
                        Preview module
                    </button>
                </div>
            </div>
        </div>
    );
};

export default SettingsEditor;
