import React, { useState } from 'react';
import { X, Dumbbell, User, Flame, Timer as TimerIcon, ArrowUp, ArrowRight, Footprints, Ruler, Percent } from 'lucide-react';
import { ExerciseDef, ExerciseType, Language } from '../types';
import { t } from '../services/i18n';
import { generateId } from '../utils/uuid';
import FilledInput from './FilledInput';

interface ExerciseModalProps {
    isOpen: boolean;
    onClose: () => void;
    onSave: (exercise: ExerciseDef) => Promise<void> | void;
    lang: Language;
    existingExercises?: ExerciseDef[];
}

const ExerciseModal: React.FC<ExerciseModalProps> = ({ isOpen, onClose, onSave, lang, existingExercises = [] }) => {
    const [newName, setNewName] = useState('');
    const [newType, setNewType] = useState<ExerciseType>(ExerciseType.STRENGTH);
    const [newBwPercentage, setNewBwPercentage] = useState<string>('100');
    const [error, setError] = useState<string>('');

    const exerciseTypeLabels: Record<ExerciseType, string> = {
        [ExerciseType.STRENGTH]: t('type_strength', lang),
        [ExerciseType.BODYWEIGHT]: t('type_bodyweight', lang),
        [ExerciseType.CARDIO]: t('type_cardio', lang),
        [ExerciseType.STATIC]: t('type_static', lang),
        [ExerciseType.HIGH_JUMP]: t('type_height', lang),
        [ExerciseType.LONG_JUMP]: t('type_dist', lang),
        [ExerciseType.PLYOMETRIC]: t('type_jump', lang),
    };

    const handleCreateExercise = async () => {
        if (!newName.trim()) return;

        // Check for duplicate name (case-insensitive)
        const trimmedName = newName.trim();
        const isDuplicate = existingExercises.some(
            ex => ex.name.toLowerCase() === trimmedName.toLowerCase()
        );

        if (isDuplicate) {
            setError(t('exercise_name_exists', lang) || 'An exercise with this name already exists');
            return;
        }

        const newEx: ExerciseDef = {
            id: generateId(),
            name: trimmedName,
            type: newType,
            ...(newType === ExerciseType.BODYWEIGHT && { bodyWeightPercentage: parseFloat(newBwPercentage) || 100 })
        };
        await onSave(newEx);
        setNewName('');
        setNewType(ExerciseType.STRENGTH);
        setNewBwPercentage('100');
        setError('');
        onClose();
    };

    if (!isOpen) return null;

    return (
        <div className="fixed inset-0 bg-black/60 z-[60] flex items-end sm:items-center justify-center p-4 backdrop-blur-sm">
            <div className="bg-surface-container w-full max-w-sm rounded-[28px] p-6 shadow-elevation-3 animate-in slide-in-from-bottom-10 duration-200">
                <div className="flex justify-between items-center mb-6">
                    <h3 className="text-2xl font-normal text-on-surface">{t('create_exercise', lang)}</h3>
                    <button onClick={onClose} className="p-2 bg-surface-container-high rounded-full hover:bg-outline-variant/20"><X size={20} /></button>
                </div>

                <div className="space-y-6">
                    <div>
                        <FilledInput
                            label={t('ex_name', lang)}
                            value={newName}
                            onChange={(e: any) => {
                                setNewName(e.target.value);
                                setError(''); // Clear error when user types
                            }}
                            type="text"
                            autoFocus
                        />
                        {error && (
                            <p className="text-xs text-error mt-2 ml-3">{error}</p>
                        )}
                    </div>

                    <div>
                        <label className="block text-xs text-on-surface-variant font-medium mb-3">{t('ex_type', lang)}</label>
                        <div className="flex flex-wrap gap-2">
                            {[
                                { id: ExerciseType.STRENGTH, label: exerciseTypeLabels[ExerciseType.STRENGTH], icon: Dumbbell },
                                { id: ExerciseType.BODYWEIGHT, label: exerciseTypeLabels[ExerciseType.BODYWEIGHT], icon: User },
                                { id: ExerciseType.CARDIO, label: exerciseTypeLabels[ExerciseType.CARDIO], icon: Flame },
                                { id: ExerciseType.STATIC, label: exerciseTypeLabels[ExerciseType.STATIC], icon: TimerIcon },
                                { id: ExerciseType.HIGH_JUMP, label: exerciseTypeLabels[ExerciseType.HIGH_JUMP], icon: ArrowUp },
                                { id: ExerciseType.LONG_JUMP, label: exerciseTypeLabels[ExerciseType.LONG_JUMP], icon: Ruler },
                                { id: ExerciseType.PLYOMETRIC, label: exerciseTypeLabels[ExerciseType.PLYOMETRIC], icon: Footprints },
                            ].map((type) => (
                                <button
                                    key={type.id}
                                    onClick={() => setNewType(type.id)}
                                    className={`px-4 py-2 rounded-lg flex items-center gap-2 text-xs font-medium border transition-all ${newType === type.id
                                        ? 'bg-secondary-container text-on-secondary-container border-transparent'
                                        : 'bg-transparent text-on-surface-variant border-outline hover:border-on-surface-variant'
                                        }`}
                                >
                                    <type.icon size={14} /> {type.label}
                                </button>
                            ))}
                        </div>
                    </div>

                    {newType === ExerciseType.BODYWEIGHT && (
                        <FilledInput
                            label={t('body_weight_percent', lang)}
                            value={newBwPercentage}
                            onChange={(e: any) => setNewBwPercentage(e.target.value)}
                            icon={<Percent size={12} />}
                        />
                    )}

                    <div className="flex justify-end mt-4">
                        <button
                            onClick={handleCreateExercise}
                            className="px-8 py-3 bg-primary text-on-primary rounded-full font-medium shadow-elevation-1"
                        >
                            {t('create_btn', lang)}
                        </button>
                    </div>
                </div>
            </div>
        </div>
    );
};

export default ExerciseModal;