/**
 * Saadhanam Registration - Education Level Cascade
 * Flow: State → Language → Education Level → Goal → Stream → Exam
 * Version: 4.0.0 — Comprehensive (all 137 exams, all states)
 */

let currentState = null;
let currentLanguage = null;
let currentEducationLevel = null;
let currentGoal = null;
let currentFieldValue = null;

// ── GOAL MAP ────────────────────────────────────────────────────────────────
// Education Level → list of Goals (with emoji, label)
const GOAL_MAP = {

    OLYMPIADS: [
        { code: 'OLYMPIAD',     emoji: '🏆', label: 'Olympiad (IMO / NSO / NCO / IEO)' },
        { code: 'SCHOLARSHIP',  emoji: '🎓', label: 'Scholarship (NTSE / NMMS)' },
    ],

    SCHOOL_LEVEL: [
        { code: 'NAVODAYA',     emoji: '🏫', label: 'Navodaya Vidyalaya (JNVST)' },
        { code: 'SAINIK_SCH',   emoji: '🎖️', label: 'Sainik School Entrance' },
    ],

    AFTER_10TH: [
        { code: 'POLYTECHNIC',    emoji: '🔧', label: 'Polytechnic / Diploma' },
        { code: 'ITI',            emoji: '⚙️', label: 'ITI / Vocational' },
        { code: 'RESIDENTIAL_SCH',emoji: '🏫', label: 'Residential / Welfare Schools' },
        { code: 'RECRUITMENT_10', emoji: '🚂', label: 'Recruitment (Railway / Govt)' },
        { code: 'DEFENCE_10',     emoji: '🎖️', label: 'Defence (Sainik / NDA Foundation)' },
    ],

    DIPLOMA_PASSED: [
        { code: 'LATERAL_ENTRY', emoji: '🎓', label: 'Lateral Entry to B.Tech (2nd Year)' },
    ],

    AFTER_12TH: [
        { code: 'ENGINEERING',    emoji: '👨‍💻', label: 'Engineering / Technology' },
        { code: 'MEDICAL',        emoji: '⚕️',  label: 'Medical / MBBS / BDS' },
        { code: 'PHARMACY',       emoji: '💊',  label: 'Pharmacy (B.Pharm)' },
        { code: 'DEFENCE',        emoji: '🎖️', label: 'Defence / NDA / Agniveer' },
        { code: 'LAW',            emoji: '⚖️',  label: 'Law / LLB' },
        { code: 'DESIGN',         emoji: '🎨',  label: 'Design / Architecture / Fashion' },
        { code: 'FINANCE',        emoji: '📊',  label: 'CA / Finance / Commerce' },
        { code: 'RESEARCH',       emoji: '🔬',  label: 'Research / Pure Science' },
        { code: 'AGRICULTURE',    emoji: '🌾',  label: 'Agriculture / Veterinary' },
        { code: 'HOTEL_MGMT',     emoji: '🏨',  label: 'Hotel Management' },
        { code: 'INTEGRATED_MBA', emoji: '📈',  label: 'Integrated MBA (5 Year)' },
        { code: 'TEACHER_12',     emoji: '📖',  label: 'Teacher Training (D.El.Ed)' },
        { code: 'RECRUITMENT_12', emoji: '👮',  label: 'Police / Govt Jobs' },
    ],

    UG_PASSED: [
        { code: 'MANAGEMENT',     emoji: '💼',  label: 'MBA / Management (CAT/XAT/MAT)' },
        { code: 'PG_ENGINEERING', emoji: '⚙️',  label: 'M.Tech / GATE' },
        { code: 'MEDICAL_PG',     emoji: '⚕️',  label: 'NEET PG / Medical Postgraduate' },
        { code: 'MCA_PG',         emoji: '💻',  label: 'MCA (NIMCET / ICET)' },
        { code: 'LAW_PG',         emoji: '⚖️',  label: 'LLM / Law PG' },
        { code: 'CIVIL_SERVICES', emoji: '🏛️', label: 'Civil Services / UPSC / PSC' },
        { code: 'TEACHING_PG',    emoji: '📖',  label: 'B.Ed / Teacher Training' },
    ],

    AFTER_GRADUATION: [
        { code: 'UGC_NET',      emoji: '🎓', label: 'UGC NET (Lectureship / JRF)' },
        { code: 'CSIR_NET',     emoji: '🔬', label: 'CSIR NET (Science / Engineering)' },
        { code: 'PHD_ENTRANCE', emoji: '📖', label: 'PhD Entrance (University)' },
        { code: 'FELLOWSHIP',   emoji: '🏅', label: 'Research Fellowship (DST/DBT/ICMR)' },
    ],
};

// ── STREAM MAP ───────────────────────────────────────────────────────────────
// Goal → list of Streams (subjects/specialization) — null means no stream needed
const STREAM_MAP = {
    // Olympiads
    OLYMPIAD:    null,
    SCHOLARSHIP: null,

    // School Level
    NAVODAYA:    null,
    SAINIK_SCH:  null,

    // After 10th
    POLYTECHNIC:     null,
    ITI:             null,
    RESIDENTIAL_SCH: null,
    RECRUITMENT_10:  null,
    DEFENCE_10:      null,

    // After 12th (no stream)
    TEACHER_12:      null,
    RECRUITMENT_12:  null,

    // Diploma Passed
    LATERAL_ENTRY: null,

    // After 12th - Engineering streams
    ENGINEERING: [
        { code: 'PCM',  emoji: '📢', label: 'PCM (Physics, Chemistry, Maths)' },
        { code: 'PCMB', emoji: '🧬', label: 'PCMB (All four subjects)' },
        { code: 'CS',   emoji: '💻', label: 'Computer Science / IT' },
    ],
    MEDICAL: [
        { code: 'PCB',  emoji: '🧬', label: 'PCB (Physics, Chemistry, Biology)' },
        { code: 'PCMB', emoji: '🔬', label: 'PCMB (All four subjects)' },
    ],
    PHARMACY:       null,
    DEFENCE:        null,
    LAW:            null,
    DESIGN: [
        { code: 'FINE_ARTS',   emoji: '🎨', label: 'Fine Arts / Drawing' },
        { code: 'SCIENCE_DES', emoji: '📐', label: 'Science Background' },
        { code: 'ANY_DES',     emoji: '✏️',  label: 'Any Stream' },
    ],
    FINANCE:        null,
    RESEARCH: [
        { code: 'PCM', emoji: '📢', label: 'Physics / Chemistry / Maths' },
        { code: 'PCB', emoji: '🧬', label: 'Biology / Life Sciences' },
    ],
    AGRICULTURE:    null,
    HOTEL_MGMT:     null,
    INTEGRATED_MBA: null,
    TEACHER_12:     null,
    RECRUITMENT_12: null,
    OTHER_12:       null,

    // UG Passed
    PG_ENGINEERING: [
        { code: 'CIVIL', emoji: '🏗️',  label: 'Civil Engineering' },
        { code: 'MECH',  emoji: '⚙️',  label: 'Mechanical Engineering' },
        { code: 'ECE',   emoji: '📡',  label: 'Electronics / ECE' },
        { code: 'CSE',   emoji: '💻',  label: 'Computer Science / IT' },
        { code: 'EEE',   emoji: '⚡',  label: 'Electrical Engineering' },
        { code: 'CHEM',  emoji: '🧪',  label: 'Chemical Engineering' },
    ],
    MANAGEMENT: [
        { code: 'GENERAL_MBA', emoji: '💼', label: 'General MBA' },
        { code: 'FINANCE_MBA', emoji: '📊', label: 'Finance / Banking' },
        { code: 'TECH_MBA',    emoji: '💻', label: 'Tech / IT Management' },
    ],
    MEDICAL_PG:     null,
    MCA_PG:         null,
    LAW_PG:         null,
    CIVIL_SERVICES: null,
    TEACHING_PG:    null,

    // PG Passed
    UGC_NET: [
        { code: 'HUMANITIES', emoji: '📚', label: 'Humanities / Social Sciences' },
        { code: 'COMMERCE',   emoji: '💼', label: 'Commerce / Management' },
        { code: 'SCIENCES',   emoji: '🔬', label: 'Sciences' },
        { code: 'CS_IT',      emoji: '💻', label: 'Computer Science / IT' },
        { code: 'EDUCATION',  emoji: '🎓', label: 'Education' },
    ],
    CSIR_NET: [
        { code: 'LIFE_SCI',  emoji: '🧬', label: 'Life Sciences' },
        { code: 'CHEM_SCI',  emoji: '🧪', label: 'Chemical Sciences' },
        { code: 'PHY_SCI',   emoji: '⚛️',  label: 'Physical Sciences' },
        { code: 'MATH_SCI',  emoji: '📐', label: 'Mathematical Sciences' },
        { code: 'EARTH_SCI', emoji: '🌍', label: 'Earth Sciences' },
    ],
    PHD_ENTRANCE: null,
    FELLOWSHIP:   null,
};

// ── EXAM MAP ─────────────────────────────────────────────────────────────────
// Goal + Stream + State → filtered exam list
function getExamsForGoalStream(goal, stream, state) {
    const S = state || '';
    const G = goal || '';
    const ST = stream || '';

    // ── School Level ─────────────────────────────────────────────────────────
    if (G === 'NAVODAYA') {
        return [
            { exam_code: 'JNVST_6', exam_name: 'Navodaya Class 6 (JNVST)', is_national: true },
            { exam_code: 'JNVST_9', exam_name: 'Navodaya Class 9 (JNVST)', is_national: true },
        ];
    }

    if (G === 'SAINIK_SCH') {
        return [
            { exam_code: 'SAINIK_6', exam_name: 'Sainik School Class 6', is_national: true },
            { exam_code: 'SAINIK_9', exam_name: 'Sainik School Class 9', is_national: true },
        ];
    }

    // ── Olympiads ─────────────────────────────────────────────────────────────
    if (G === 'OLYMPIAD') {
        return [
            { exam_code: 'IMO',  exam_name: 'International Mathematics Olympiad', is_national: true },
            { exam_code: 'NSO',  exam_name: 'National Science Olympiad', is_national: true },
            { exam_code: 'NCO',  exam_name: 'National Cyber Olympiad', is_national: true },
            { exam_code: 'IEO',  exam_name: 'International English Olympiad', is_national: true },
            { exam_code: 'IGKO', exam_name: 'International General Knowledge Olympiad', is_national: true },
        ];
    }

    if (G === 'SCHOLARSHIP') {
        return [
            { exam_code: 'NTSE', exam_name: 'NTSE (National Talent Search)', is_national: true },
            { exam_code: 'NMMS', exam_name: 'NMMS Scholarship', is_national: true },
        ];
    }

    // ── After 10th ────────────────────────────────────────────────────────────
    if (G === 'POLYTECHNIC') {
        const stateExams = {
            TG: [
                { exam_code: 'TS_POLYCET', exam_name: 'TS POLYCET (MPC) — Engineering',            is_national: false, state_name: 'Telangana', exam_stream: 'MPC',   stream_desc: 'Maths + Physics + Chemistry (120 questions)' },
                { exam_code: 'TS_POLYCET', exam_name: 'TS POLYCET (MBiPC) — Agriculture/Veterinary', is_national: false, state_name: 'Telangana', exam_stream: 'MBiPC', stream_desc: 'Maths + Physics + Chemistry + Biology (150 questions)' },
            ],
            AP: [{ exam_code: 'AP_POLYCET', exam_name: 'AP POLYCET',              is_national: false, state_name: 'Andhra Pradesh' }],
            AS: [{ exam_code: 'AS_PAT',     exam_name: 'Assam PAT Polytechnic',   is_national: false, state_name: 'Assam' }],
            BR: [{ exam_code: 'BR_DCECE',   exam_name: 'Bihar DCECE Polytechnic', is_national: false, state_name: 'Bihar' }],
            CG: [{ exam_code: 'CG_PPT',     exam_name: 'CG PPT Polytechnic',      is_national: false, state_name: 'Chhattisgarh' }],
            HP: [{ exam_code: 'HP_PAT',     exam_name: 'HP PAT Polytechnic',      is_national: false, state_name: 'Himachal Pradesh' }],
            JH: [{ exam_code: 'JH_PECE',    exam_name: 'Jharkhand PECE',          is_national: false, state_name: 'Jharkhand' }],
            KA: [{ exam_code: 'KA_DCET',    exam_name: 'Karnataka DCET',          is_national: false, state_name: 'Karnataka' }],
            MP: [{ exam_code: 'MP_PPT',     exam_name: 'MP PPT Polytechnic',      is_national: false, state_name: 'Madhya Pradesh' }],
            NE: [{ exam_code: 'NE_POLY',    exam_name: 'NE Polytechnic',          is_national: false, state_name: 'North East' }],
            PB: [{ exam_code: 'PB_POLYCET', exam_name: 'Punjab POLYCET',          is_national: false, state_name: 'Punjab' }],
            UP: [{ exam_code: 'UP_JEECUP',  exam_name: 'UP JEECUP Polytechnic',   is_national: false, state_name: 'Uttar Pradesh' }],
            WB: [{ exam_code: 'WB_JEXPO',   exam_name: 'WB JEXPO Polytechnic',   is_national: false, state_name: 'West Bengal' }],
        };
        return [...(stateExams[S] || [])];
    }

    if (G === 'ITI') {
        const stateExams = {
            TG: [{ exam_code: 'ITI_TG', exam_name: 'ITI Entrance Telangana', is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'ITI_AP', exam_name: 'ITI Entrance AP',        is_national: false, state_name: 'Andhra Pradesh' }],
        };
        const national = [
            { exam_code: 'ITI_NCVT', exam_name: 'NCVT ITI (National)', is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'RESIDENTIAL_SCH') {
        const stateExams = {
            TG: [
                { exam_code: 'TSRJC',      exam_name: 'TSRJC CET',           is_national: false, state_name: 'Telangana' },
                { exam_code: 'TSSWREIS',   exam_name: 'TS Social Welfare RJC',is_national: false, state_name: 'Telangana' },
                { exam_code: 'MJPBCWREIS', exam_name: 'TS BC Welfare RJC',    is_national: false, state_name: 'Telangana' },
                { exam_code: 'TTWREIS',    exam_name: 'TS Tribal Welfare RJC',is_national: false, state_name: 'Telangana' },
            ],
            AP: [
                { exam_code: 'APRJC',    exam_name: 'APRJC CET',             is_national: false, state_name: 'Andhra Pradesh' },
                { exam_code: 'APSWREIS', exam_name: 'AP Social Welfare RJC', is_national: false, state_name: 'Andhra Pradesh' },
            ],
        };
    }

    if (G === 'RECRUITMENT_10') {
        return [
            { exam_code: 'RRB_GRP_D', exam_name: 'Railway Group D', is_national: true },
        ];
    }

    if (G === 'DEFENCE_10') {
        return [
            { exam_code: 'SAINIK_6', exam_name: 'Sainik School Entrance', is_national: true },
            { exam_code: 'SAINIK_9', exam_name: 'Sainik School Entrance (Class 9)', is_national: true },
        ];
    }

    if (G === 'PARAMEDICAL') {
        const stateExams = {
        };
        const national = [
        ];
        return [...(stateExams[S] || []), ...national];
    }

    // ── Diploma Passed ────────────────────────────────────────────────────────
    if (G === 'LATERAL_ENTRY') {
        const stateExams = {
            TG: [{ exam_code: 'TG_ECET',   exam_name: 'Telangana ECET',             is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_ECET',   exam_name: 'AP ECET',                    is_national: false, state_name: 'Andhra Pradesh' }],
            KA: [{ exam_code: 'KA_DCET',   exam_name: 'Karnataka DCET',             is_national: false, state_name: 'Karnataka' }],
            MH: [{ exam_code: 'MH_CET_LE', exam_name: 'Maharashtra CET Lateral Entry', is_national: false, state_name: 'Maharashtra' }],
            DL: [{ exam_code: 'DL_CET_LE', exam_name: 'Delhi CET Lateral Entry',    is_national: false, state_name: 'Delhi' }],
            GJ: [{ exam_code: 'GJ_LEET',   exam_name: 'Gujarat LEET',               is_national: false, state_name: 'Gujarat' }],
            PB: [{ exam_code: 'PB_LEET',   exam_name: 'Punjab LEET',                is_national: false, state_name: 'Punjab' }],
            RJ: [{ exam_code: 'RJ_LEET',   exam_name: 'Rajasthan LEET',             is_national: false, state_name: 'Rajasthan' }],
            UP: [{ exam_code: 'UP_LEET',   exam_name: 'UP Lateral Entry',           is_national: false, state_name: 'Uttar Pradesh' }],
            WB: [{ exam_code: 'WB_JELET',  exam_name: 'WB JELET',                  is_national: false, state_name: 'West Bengal' }],
        };
    }

    // ── After 12th ────────────────────────────────────────────────────────────
    if (G === 'ENGINEERING') {
        const stateExams = {
            TG: [{ exam_code: 'TS_EAMCET',    exam_name: 'TS EAMCET',                   is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_EAMCET',    exam_name: 'AP EAMCET',                   is_national: false, state_name: 'Andhra Pradesh' }],
            AS: [{ exam_code: 'AS_CEE',       exam_name: 'Assam CEE',                   is_national: false, state_name: 'Assam' }],
            BR: [{ exam_code: 'BCECE',        exam_name: 'Bihar BCECE',                 is_national: false, state_name: 'Bihar' }],
            GJ: [{ exam_code: 'GUJCET',       exam_name: 'GUJCET',                      is_national: false, state_name: 'Gujarat' }],
            KA: [
                { exam_code: 'KCET',        exam_name: 'Karnataka CET (KCET)',    is_national: false, state_name: 'Karnataka' },
                { exam_code: 'COMEDK',      exam_name: 'COMEDK (Private Colleges)', is_national: false, state_name: 'Karnataka' },
                { exam_code: 'MANIPAL_MET', exam_name: 'Manipal Engineering Test', is_national: false, state_name: 'Karnataka' },
            ],
            KL: [{ exam_code: 'KEAM',         exam_name: 'Kerala KEAM',                 is_national: false, state_name: 'Kerala' }],
            MH: [{ exam_code: 'MHT_CET',      exam_name: 'MHT CET',                     is_national: false, state_name: 'Maharashtra' }],
            OD: [{ exam_code: 'OJEE',         exam_name: 'Odisha JEE',                  is_national: false, state_name: 'Odisha' }],
            TN: [{ exam_code: 'TNEA',         exam_name: 'TN Engineering Admissions',   is_national: false, state_name: 'Tamil Nadu' }],
            UP: [{ exam_code: 'UPSEE',        exam_name: 'UPSEE / AKTU',                is_national: false, state_name: 'Uttar Pradesh' }],
            WB: [{ exam_code: 'WBJEE',        exam_name: 'WBJEE',                       is_national: false, state_name: 'West Bengal' }],
        };
        const national = [
            { exam_code: 'JEE_MAIN',     exam_name: 'JEE Main',              is_national: true },
            { exam_code: 'JEE_ADVANCED', exam_name: 'JEE Advanced (IIT)',    is_national: true },
            { exam_code: 'BITSAT',       exam_name: 'BITSAT (BITS Pilani)',   is_national: true },
            { exam_code: 'VITEEE',       exam_name: 'VITEEE (VIT)',           is_national: true },
            { exam_code: 'SRMJEEE',      exam_name: 'SRMJEEE (SRM)',          is_national: true },
            { exam_code: 'CUET_UG',      exam_name: 'CUET UG (Central Universities)', is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'MEDICAL') {
        const stateExams = {
            TG: [{ exam_code: 'TS_EAMCET', exam_name: 'TS EAMCET (Medical)', is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_EAMCET', exam_name: 'AP EAMCET (Medical)', is_national: false, state_name: 'Andhra Pradesh' }],
            KA: [{ exam_code: 'KCET',      exam_name: 'KCET (Medical)',       is_national: false, state_name: 'Karnataka' }],
        };
        const national = [
            { exam_code: 'NEET_UG', exam_name: 'NEET UG (MBBS/BDS)', is_national: true },
            { exam_code: 'AIIMS',   exam_name: 'AIIMS UG',            is_national: true },
            { exam_code: 'JIPMER',  exam_name: 'JIPMER MBBS',         is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'PHARMACY') {
        const stateExams = {
            TG: [{ exam_code: 'TS_PHARCET', exam_name: 'TS Pharmacy CET', is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_PHARCET', exam_name: 'AP Pharmacy CET', is_national: false, state_name: 'Andhra Pradesh' }],
            KA: [{ exam_code: 'KA_PHARCET', exam_name: 'KA Pharmacy CET', is_national: false, state_name: 'Karnataka' }],
            MH: [{ exam_code: 'MH_PHARCET', exam_name: 'MH Pharmacy CET', is_national: false, state_name: 'Maharashtra' }],
            TN: [{ exam_code: 'TN_PHARCET', exam_name: 'TN Pharmacy CET', is_national: false, state_name: 'Tamil Nadu' }],
        };
        const national = [
            { exam_code: 'NEET_UG', exam_name: 'NEET UG (also for Pharmacy)', is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'DEFENCE') {
        return [
            { exam_code: 'NDA',      exam_name: 'NDA (Army/Navy/Air Force)', is_national: true },
            { exam_code: 'NDA_1',    exam_name: 'NDA Exam 1',                is_national: true },
            { exam_code: 'NDA_2',    exam_name: 'NDA Exam 2',                is_national: true },
            { exam_code: 'AGNIVEER', exam_name: 'Agniveer (Army/Navy/AF)',   is_national: true },
        ];
    }

    if (G === 'LAW') {
        const stateExams = {
            TG: [{ exam_code: 'TS_LAWCET',  exam_name: 'Telangana LAWCET',   is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_LAWCET',  exam_name: 'AP LAWCET',          is_national: false, state_name: 'Andhra Pradesh' }],
            MH: [
                { exam_code: 'MH_CET_LAW', exam_name: 'MH CET Law',          is_national: false, state_name: 'Maharashtra' },
                { exam_code: 'SLAT',       exam_name: 'Symbiosis Law (SLAT)', is_national: false, state_name: 'Maharashtra' },
            ],
            DL: [
                { exam_code: 'AILET',  exam_name: 'AILET (NLU Delhi)',       is_national: false, state_name: 'Delhi' },
                { exam_code: 'DU_LLB', exam_name: 'Delhi University LLB',    is_national: false, state_name: 'Delhi' },
            ],
        };
        const national = [
            { exam_code: 'CLAT',  exam_name: 'CLAT (NLUs)',     is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'DESIGN') {
        const stateExams = {
            DL: [{ exam_code: 'PEARL', exam_name: 'Pearl Academy Entrance', is_national: false, state_name: 'Delhi' }],
        };
        const national = [
            { exam_code: 'NID_DAT',  exam_name: 'NID (National Institute of Design)', is_national: true },
            { exam_code: 'NIFT',     exam_name: 'NIFT Entrance',                      is_national: true },
            { exam_code: 'UCEED',    exam_name: 'UCEED (IIT B.Des)',                  is_national: true },
            { exam_code: 'AIEED',    exam_name: 'All India Entrance Exam Design',     is_national: true },
            { exam_code: 'NATA',     exam_name: 'NATA (Architecture)',                is_national: true },
            { exam_code: 'JEE_BARCH',exam_name: 'JEE Paper 2 (B.Arch)',              is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'FINANCE') {
        return [
            { exam_code: 'CA_FOUNDATION',     exam_name: 'CA Foundation (ICAI)',          is_national: true },
            { exam_code: 'CA_FOUNDATION_MAY', exam_name: 'CA Foundation - May Sitting',   is_national: true },
            { exam_code: 'CA_FOUNDATION_NOV', exam_name: 'CA Foundation - November Sitting', is_national: true },
        ];
    }

    if (G === 'RESEARCH') {
        return [
            { exam_code: 'IISER_IAT', exam_name: 'IISER Aptitude Test', is_national: true },
            { exam_code: 'NEST',      exam_name: 'NEST (NISER/CBS)',     is_national: true },
            { exam_code: 'CUET_UG',   exam_name: 'CUET UG (Science)',    is_national: true },
        ];
    }

    if (G === 'AGRICULTURE') {
        const stateExams = {
            TG: [{ exam_code: 'TS_EAMCET', exam_name: 'TS EAMCET (Agriculture)', is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_EAMCET', exam_name: 'AP EAMCET (Agriculture)', is_national: false, state_name: 'Andhra Pradesh' }],
        };
        const national = [
            { exam_code: 'ICAR_AIEEA_UG', exam_name: 'ICAR AIEEA UG (Agriculture)', is_national: true },
            { exam_code: 'CUET_UG',       exam_name: 'CUET UG (Agriculture)',        is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'HOTEL_MGMT') {
        return [
            { exam_code: 'NCHMCT_JEE', exam_name: 'NCHMCT JEE (IHMs)', is_national: true },
        ];
    }

    if (G === 'INTEGRATED_MBA') {
        const stateExams = {
            DL: [{ exam_code: 'DU_JAT', exam_name: 'Delhi University BBA/BMS', is_national: false, state_name: 'Delhi' }],
            MH: [
                { exam_code: 'NPAT', exam_name: 'NMIMS NPAT',       is_national: false, state_name: 'Maharashtra' },
                { exam_code: 'SET',  exam_name: 'Symbiosis SET',     is_national: false, state_name: 'Maharashtra' },
            ],
            MP: [{ exam_code: 'IPMAT', exam_name: 'IIM Indore IPMAT', is_national: false, state_name: 'Madhya Pradesh' }],
        };
        const national = [
            { exam_code: 'JIPMAT', exam_name: 'JIPMAT (IIM Jammu/Bodhgaya)', is_national: true },
            { exam_code: 'IPMAT',  exam_name: 'IIM Indore IPMAT',            is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'TEACHER_12') {
        const stateExams = {
            TG: [{ exam_code: 'DELED_TG', exam_name: 'D.El.Ed CET Telangana', is_national: false, state_name: 'Telangana' }],
        };
    }

    if (G === 'RECRUITMENT_12') {
        const stateExams = {
            TG: [{ exam_code: 'TS_POLICE', exam_name: 'TS Police Constable', is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_POLICE', exam_name: 'AP Police Constable', is_national: false, state_name: 'Andhra Pradesh' }],
        };
        const national = [
            { exam_code: 'AGNIVEER', exam_name: 'Agniveer (Army/Navy/AF)', is_national: true },
            { exam_code: 'SSC_CHSL', exam_name: 'SSC CHSL',               is_national: true },
            { exam_code: 'RRB_GRP_D',exam_name: 'Railway Group D',         is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    // ── UG Passed ─────────────────────────────────────────────────────────────
    if (G === 'MANAGEMENT') {
        const stateExams = {
            TG: [{ exam_code: 'TG_ICET',    exam_name: 'TG ICET (MBA/MCA)',     is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_ICET',    exam_name: 'AP ICET (MBA/MCA)',     is_national: false, state_name: 'Andhra Pradesh' }],
            KA: [{ exam_code: 'KA_PGCET',   exam_name: 'Karnataka PGCET (MBA)', is_national: false, state_name: 'Karnataka' }],
            MH: [{ exam_code: 'MH_MBA_CET', exam_name: 'MH MBA CET',            is_national: false, state_name: 'Maharashtra' }],
            TN: [{ exam_code: 'TN_TANCET',  exam_name: 'TN TANCET',             is_national: false, state_name: 'Tamil Nadu' }],
            UP: [{ exam_code: 'UP_SEE',     exam_name: 'UP SEE (MBA)',           is_national: false, state_name: 'Uttar Pradesh' }],
        };
        const national = [
            { exam_code: 'CAT',     exam_name: 'CAT (IIMs)',                   is_national: true },
            { exam_code: 'XAT',     exam_name: 'XAT (XLRI)',                   is_national: true },
            { exam_code: 'MAT',     exam_name: 'MAT',                          is_national: true },
            { exam_code: 'CMAT',    exam_name: 'CMAT',                         is_national: true },
            { exam_code: 'SNAP',    exam_name: 'SNAP (Symbiosis)',              is_national: true },
            { exam_code: 'NMAT',    exam_name: 'NMAT (NMIMS)',                  is_national: true },
            { exam_code: 'ATMA',    exam_name: 'ATMA',                         is_national: true },
            { exam_code: 'IBSAT',   exam_name: 'IBSAT (ICFAI)',                 is_national: true },
            { exam_code: 'IIFT',    exam_name: 'IIFT MBA',                     is_national: true },
            { exam_code: 'MICAT',   exam_name: 'MICAT (MICA)',                  is_national: true },
            { exam_code: 'TISSNET', exam_name: 'TISSNET (TISS)',                is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'PG_ENGINEERING') {
        const stateExams = {
            KA: [{ exam_code: 'KA_PGCET',  exam_name: 'Karnataka PGCET (M.Tech)', is_national: false, state_name: 'Karnataka' }],
        };
        const national = [
            { exam_code: 'GATE',    exam_name: 'GATE',            is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'MEDICAL_PG') {
        const stateExams = {
            KA: [{ exam_code: 'KA_PGET',  exam_name: 'Karnataka PGET',  is_national: false, state_name: 'Karnataka' }],
            MH: [{ exam_code: 'MH_MPHARM',exam_name: 'MH M.Pharm CET', is_national: false, state_name: 'Maharashtra' }],
        };
        const national = [
            { exam_code: 'NEET_PG', exam_name: 'NEET PG (Medical Postgraduate)', is_national: true },
            { exam_code: 'GPAT',    exam_name: 'GPAT (Pharmacy PG)',             is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'MCA_PG') {
        const stateExams = {
            TG: [{ exam_code: 'TG_ICET',  exam_name: 'TG ICET (MCA)',       is_national: false, state_name: 'Telangana' }],
            AP: [{ exam_code: 'AP_ICET',  exam_name: 'AP ICET (MCA)',       is_national: false, state_name: 'Andhra Pradesh' }],
            KA: [{ exam_code: 'KA_PGCET', exam_name: 'Karnataka PGCET (MCA)', is_national: false, state_name: 'Karnataka' }],
            WB: [{ exam_code: 'WB_JECA',  exam_name: 'WB JECA (MCA)',       is_national: false, state_name: 'West Bengal' }],
        };
        const national = [
            { exam_code: 'NIMCET',  exam_name: 'NIMCET (NIT MCA)',             is_national: true },
            { exam_code: 'CUET_PG', exam_name: 'CUET PG (Central Universities)', is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'LAW_PG') {
        const stateExams = {
            KL: [{ exam_code: 'KL_LET', exam_name: 'Kerala Law Entrance Test', is_national: false, state_name: 'Kerala' }],
        };
        const national = [
            { exam_code: 'PGAT',    exam_name: 'NLU Postgraduate Admission Test', is_national: true },
            { exam_code: 'CUET_PG', exam_name: 'CUET PG (Law)',                   is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'CIVIL_SERVICES') {
        const stateExams = {
        };
        const national = [
            { exam_code: 'SSC_CGL',  exam_name: 'SSC CGL',                 is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    if (G === 'BANKING') {
        return [
            { exam_code: 'SSC_CGL',    exam_name: 'SSC CGL',               is_national: true },
        ];
    }

    if (G === 'TEACHING_PG') {
        const stateExams = {
            RJ: [{ exam_code: 'RJ_PTET', exam_name: 'Rajasthan PTET (B.Ed)', is_national: false, state_name: 'Rajasthan' }],
        };
        const national = [
            { exam_code: 'CUET_PG', exam_name: 'CUET PG (Education)', is_national: true },
        ];
        return [...(stateExams[S] || []), ...national];
    }

    // ── PG Passed / Masters Done ──────────────────────────────────────────────
    if (G === 'UGC_NET') {
        return [{ exam_code: 'UGC_NET', exam_name: 'UGC NET (All Subjects)', is_national: true }];
    }

    if (G === 'CSIR_NET') {
        return [{ exam_code: 'CSIR_NET', exam_name: 'CSIR NET', is_national: true }];
    }

    if (G === 'PHD_ENTRANCE') {
        return [
            { exam_code: 'UGC_NET',  exam_name: 'UGC NET JRF (PhD eligibility)', is_national: true },
            { exam_code: 'CSIR_NET', exam_name: 'CSIR NET JRF',                  is_national: true },
            { exam_code: 'CUET_PG',  exam_name: 'CUET PG (Research programs)',   is_national: true },
            { exam_code: 'JNUEE',    exam_name: 'JNU Entrance Examination',       is_national: true },
        ];
    }

    if (G === 'FELLOWSHIP') {
        return [
            { exam_code: 'GATE',     exam_name: 'GATE (for Research Fellowship)', is_national: true },
            { exam_code: 'UGC_NET',  exam_name: 'UGC NET JRF',                    is_national: true },
            { exam_code: 'CSIR_NET', exam_name: 'CSIR NET JRF',                   is_national: true },
        ];
    }

    // Fallback
}

// ── DROPDOWN UPDATERS ────────────────────────────────────────────────────────

function updateLanguageDropdown(languages) {
    const dd = document.getElementById('languageSelect');
    dd.innerHTML = '<option value="">Select language</option>';
    languages.forEach(lang => {
        const o = document.createElement('option');
        o.value = lang.code;
        o.textContent = lang.native;
        dd.appendChild(o);
    });
    dd.disabled = false;
    if (languages.length > 0) {
        dd.value = languages[0].code;
        currentLanguage = languages[0].code;
        onLanguageChange();
    }
}

function updateEducationLevelDropdown(levels) {
    const dd = document.getElementById('educationLevelSelect');
    dd.innerHTML = '<option value="">Select education level</option>';
    levels.forEach(level => {
        const o = document.createElement('option');
        o.value = level.code;
        o.textContent = `${level.emoji} ${level.name}`;
        dd.appendChild(o);
    });
    dd.disabled = false;
    resetGoalDropdown();
    resetStreamDropdown();
    resetExamDropdown();
}

function updateGoalDropdown(goals) {
    const dd = document.getElementById('goalSelect');
    if (!dd) return;
    dd.innerHTML = '<option value="">What is your goal?</option>';
    goals.forEach(g => {
        const o = document.createElement('option');
        o.value = g.code;
        const gLabel = (typeof i18n !== 'undefined' && i18n[curLang] && i18n[curLang]['goal_' + g.code])
            ? i18n[curLang]['goal_' + g.code]
            : `${g.emoji}  ${g.label}`;
        o.textContent = gLabel;
        dd.appendChild(o);
    });
    dd.disabled = false;
    document.getElementById('goalContainer').style.display = 'block';
    resetStreamDropdown();
    resetExamDropdown();
}

function updateStreamDropdown(streams) {
    const dd = document.getElementById('fieldSelect');
    const container = document.getElementById('fieldContainer');
    if (!dd) return;
    dd.innerHTML = '<option value="">Select your stream</option>';
    streams.forEach(s => {
        const o = document.createElement('option');
        o.value = s.code;
        const sLabel = (typeof i18n !== 'undefined' && i18n[curLang] && i18n[curLang]['stream_' + s.code])
            ? i18n[curLang]['stream_' + s.code]
            : `${s.emoji}  ${s.label}`;
        o.textContent = sLabel;
        dd.appendChild(o);
    });
    container.style.display = 'block';
    dd.disabled = false;
    resetExamDropdown();
}

function updateExamDropdown(exams) {
    const dd = document.getElementById('examSelect');
    dd.innerHTML = '<option value="">Select exam</option>';
    if (!exams || exams.length === 0) {
        dd.innerHTML = '<option value="">No exams available</option>';
        return;
    }
    const stateExams    = exams.filter(e => !e.is_national);
    const nationalExams = exams.filter(e => e.is_national);
    if (stateExams.length > 0) {
        const g = document.createElement('optgroup');
        g.label = `${stateExams[0].state_name || 'State'} Exams`;
        stateExams.forEach(e => {
            const o = document.createElement('option');
            o.value = e.exam_code;
            o.textContent = e.exam_name;
            g.appendChild(o);
        });
        dd.appendChild(g);
    }
    if (nationalExams.length > 0) {
        const g = document.createElement('optgroup');
        g.label = 'All India Exams';
        nationalExams.forEach(e => {
            const o = document.createElement('option');
            o.value = e.exam_code;
            o.textContent = e.exam_name;
            g.appendChild(o);
        });
        dd.appendChild(g);
    }
    dd.disabled = false;
}

// ── RESET HELPERS ────────────────────────────────────────────────────────────
function resetGoalDropdown() {
    const dd = document.getElementById('goalSelect');
    const container = document.getElementById('goalContainer');
    if (dd) { dd.innerHTML = '<option value="">What is your goal?</option>'; dd.disabled = true; }
    if (container) container.style.display = 'none';
    currentGoal = null;
}
function resetStreamDropdown() {
    const dd = document.getElementById('fieldSelect');
    const container = document.getElementById('fieldContainer');
    if (dd) { dd.innerHTML = '<option value="">Select stream</option>'; dd.disabled = true; }
    if (container) container.style.display = 'none';
    currentFieldValue = null;
}
function resetExamDropdown() {
    const dd = document.getElementById('examSelect');
    if (dd) { dd.innerHTML = '<option value="">Select exam</option>'; dd.disabled = true; }
}
function resetEducationLevelDropdown() {
    const dd = document.getElementById('educationLevelSelect');
    if (dd) { dd.innerHTML = '<option value="">First select language</option>'; dd.disabled = true; }
    currentEducationLevel = null;
    resetGoalDropdown();
    resetStreamDropdown();
    resetExamDropdown();
}

// ── EVENT HANDLERS ────────────────────────────────────────────────────────────

async function onStateChange() {
    const dd = document.getElementById('stateSelect');
    const selectedState = dd.value;
    if (!selectedState) return;
    currentState = selectedState;
    try {
        const r = await fetch(`/api/state-config/${selectedState}`);
        const d = await r.json();
        if (d.success) {
            updateLanguageDropdown(d.languages);
            resetEducationLevelDropdown();
        }
    } catch(e) { console.error('State config error:', e); }
}

async function onLanguageChange() {
    const dd = document.getElementById('languageSelect');
    const selectedLang = dd.value;
    if (!selectedLang) return;
    currentLanguage = selectedLang;
    if (typeof applyLang === 'function') {
        const langSwitch = document.getElementById('langSwitch');
        if (langSwitch) langSwitch.value = selectedLang;
        applyLang(selectedLang);
    }
    try {
        const r = await fetch(`/api/education-levels/${selectedLang}`);
        const d = await r.json();
        if (d.success) {
            updateEducationLevelDropdown(d.levels);
        }
    } catch(e) { console.error('Language change error:', e); }
}

function onEducationLevelChange() {
    const dd = document.getElementById('educationLevelSelect');
    const selectedLevel = dd.value;
    if (!selectedLevel) return;
    currentEducationLevel = selectedLevel;

    const goals = GOAL_MAP[selectedLevel];
    if (goals && goals.length > 0) {
        updateGoalDropdown(goals);
    } else {
        resetGoalDropdown();
        resetStreamDropdown();
        const exams = getExamsForGoalStream(null, null, currentState);
        updateExamDropdown(exams);
    }
}

function onGoalChange() {
    const dd = document.getElementById('goalSelect');
    const selectedGoal = dd.value;
    if (!selectedGoal) return;
    currentGoal = selectedGoal;

    const streams = STREAM_MAP[selectedGoal];
    if (streams && streams.length > 0) {
        updateStreamDropdown(streams);
        resetExamDropdown();
    } else {
        resetStreamDropdown();
        const exams = getExamsForGoalStream(selectedGoal, null, currentState);
        updateExamDropdown(exams);
    }
}

function onFieldChange() {
    const dd = document.getElementById('fieldSelect');
    const selectedField = dd.value;
    if (!selectedField) return;
    currentFieldValue = selectedField;
    const exams = getExamsForGoalStream(currentGoal, selectedField, currentState);
    updateExamDropdown(exams);
}

// ── INIT ──────────────────────────────────────────────────────────────────────
document.addEventListener('DOMContentLoaded', function() {
    const stateDD = document.getElementById('stateSelect');
    const langDD  = document.getElementById('languageSelect');
    const levelDD = document.getElementById('educationLevelSelect');
    const goalDD  = document.getElementById('goalSelect');
    const fieldDD = document.getElementById('fieldSelect');

    if (stateDD)  stateDD.addEventListener('change', onStateChange);
    if (langDD)   langDD.addEventListener('change', onLanguageChange);
    if (levelDD)  levelDD.addEventListener('change', onEducationLevelChange);
    if (goalDD)   goalDD.addEventListener('change', onGoalChange);
    if (fieldDD)  fieldDD.addEventListener('change', onFieldChange);

    resetEducationLevelDropdown();
    resetGoalDropdown();
    resetStreamDropdown();
    resetExamDropdown();
});