//! GHS Rev.10 H-code and P-code validation and descriptions.
//!
//! Codes are validated against the actual GHS code list (not just range checks).
//! Compound P-codes like `P301+P330+P331` are split on `+` before validation.

static H_CODES: &[&str] = &[
    "H200", "H201", "H202", "H203", "H204", "H205", "H206", "H207", "H208",
    "H220", "H221", "H222", "H223", "H224", "H225", "H226", "H227", "H228",
    "H229", "H230", "H231", "H232",
    "H240", "H241", "H242",
    "H250", "H251", "H252",
    "H260", "H261",
    "H270", "H271", "H272",
    "H280", "H281", "H282", "H283", "H284",
    "H290",
    "H300", "H301", "H302", "H303", "H304", "H305",
    "H310", "H311", "H312", "H313",
    "H314", "H315", "H316", "H317", "H318", "H319", "H320",
    "H330", "H331", "H332", "H333", "H334", "H335", "H336",
    "H340", "H341",
    "H350", "H351",
    "H360", "H361", "H362",
    "H370", "H371", "H372", "H373",
    "H400", "H401", "H402",
    "H410", "H411", "H412", "H413",
    "H420",
];

static P_CODES: &[&str] = &[
    "P101", "P102", "P103",
    "P201", "P202",
    "P210", "P211", "P212",
    "P220", "P221", "P222", "P223",
    "P230", "P231", "P232", "P233", "P234", "P235",
    "P240", "P241", "P242", "P243", "P244",
    "P250", "P251",
    "P260", "P261", "P262", "P263", "P264",
    "P270", "P271", "P272", "P273",
    "P280", "P281", "P282", "P283", "P284", "P285",
    "P301", "P302", "P303", "P304", "P305", "P306", "P307", "P308",
    // P309 was part of GHS Rev.1-5 and is still referenced in JIS Z 7253 SDSs
    // ("IF exposed or if you feel unwell: call a POISON CENTER or doctor").
    // It was merged into P308+P311 in GHS Rev.6, but many real-world SDSs use it.
    "P309",
    "P310", "P311", "P312", "P313", "P314", "P315",
    // P316-P318 added in GHS Rev.10 (2023): emergency medical help / get medical advice
    "P316", "P317", "P318",
    "P320", "P321", "P322",
    "P330", "P331", "P332", "P333", "P334", "P335", "P336", "P337", "P338",
    "P340", "P341", "P342",
    "P350", "P351", "P352", "P353",
    "P360", "P361", "P362", "P363", "P364",
    "P370", "P371", "P372", "P373", "P374", "P375", "P376", "P377", "P378",
    "P380", "P381",
    "P390", "P391",
    "P401", "P402", "P403", "P404", "P405", "P406", "P407",
    "P410", "P411", "P412", "P413",
    "P420", "P422",
    "P501", "P502", "P503",
];

pub fn is_valid_h_code(code: &str) -> bool {
    H_CODES.binary_search(&code).is_ok()
}

/// Validates a P-code, including compound codes like `P301+P330+P331`.
pub fn is_valid_p_code(code: &str) -> bool {
    code.split('+').all(|part| P_CODES.binary_search(&part.trim()).is_ok())
}

pub fn h_code_description(code: &str) -> Option<&'static str> {
    match code {
        "H200" => Some("Unstable explosive"),
        "H201" => Some("Explosive; mass explosion hazard"),
        "H202" => Some("Explosive; severe projection hazard"),
        "H203" => Some("Explosive; fire, blast or projection hazard"),
        "H204" => Some("Fire or projection hazard"),
        "H205" => Some("May mass explode in fire"),
        "H206" => Some("Fire, blast or projection hazard; increased risk of explosion if desensitizing agent is reduced"),
        "H207" => Some("Fire or projection hazard; increased risk of explosion if desensitizing agent is reduced"),
        "H208" => Some("Fire hazard; increased risk of explosion if desensitizing agent is reduced"),
        "H220" => Some("Extremely flammable gas"),
        "H221" => Some("Flammable gas"),
        "H222" => Some("Extremely flammable aerosol"),
        "H223" => Some("Flammable aerosol"),
        "H224" => Some("Extremely flammable liquid and vapour"),
        "H225" => Some("Highly flammable liquid and vapour"),
        "H226" => Some("Flammable liquid and vapour"),
        "H227" => Some("Combustible liquid"),
        "H228" => Some("Flammable solid"),
        "H229" => Some("Pressurized container: may burst if heated"),
        "H230" => Some("May react explosively even in the absence of air"),
        "H231" => Some("May react explosively even in the absence of air at elevated pressure and/or temperature"),
        "H232" => Some("May ignite spontaneously if exposed to air"),
        "H240" => Some("Heating may cause an explosion"),
        "H241" => Some("Heating may cause a fire or explosion"),
        "H242" => Some("Heating may cause a fire"),
        "H250" => Some("Catches fire spontaneously if exposed to air"),
        "H251" => Some("Self-heating; may catch fire"),
        "H252" => Some("Self-heating in large quantities; may catch fire"),
        "H260" => Some("In contact with water releases flammable gases which may ignite spontaneously"),
        "H261" => Some("In contact with water releases flammable gas"),
        "H270" => Some("May cause or intensify fire; oxidizer"),
        "H271" => Some("May cause fire or explosion; strong oxidizer"),
        "H272" => Some("May intensify fire; oxidizer"),
        "H280" => Some("Contains gas under pressure; may explode if heated"),
        "H281" => Some("Contains refrigerated gas; may cause cryogenic burns or injury"),
        "H282" => Some("Extremely flammable chemical under pressure: may explode if heated"),
        "H283" => Some("Flammable chemical under pressure: may explode if heated"),
        "H284" => Some("Chemical under pressure: may explode if heated"),
        "H290" => Some("May be corrosive to metals"),
        "H300" => Some("Fatal if swallowed"),
        "H301" => Some("Toxic if swallowed"),
        "H302" => Some("Harmful if swallowed"),
        "H303" => Some("May be harmful if swallowed"),
        "H304" => Some("May be fatal if swallowed and enters airways"),
        "H305" => Some("May be harmful if swallowed and enters airways"),
        "H310" => Some("Fatal in contact with skin"),
        "H311" => Some("Toxic in contact with skin"),
        "H312" => Some("Harmful in contact with skin"),
        "H313" => Some("May be harmful in contact with skin"),
        "H314" => Some("Causes severe skin burns and eye damage"),
        "H315" => Some("Causes skin irritation"),
        "H316" => Some("Causes mild skin irritation"),
        "H317" => Some("May cause an allergic skin reaction"),
        "H318" => Some("Causes serious eye damage"),
        "H319" => Some("Causes serious eye irritation"),
        "H320" => Some("Causes eye irritation"),
        "H330" => Some("Fatal if inhaled"),
        "H331" => Some("Toxic if inhaled"),
        "H332" => Some("Harmful if inhaled"),
        "H333" => Some("May be harmful if inhaled"),
        "H334" => Some("May cause allergy or asthma symptoms or breathing difficulties if inhaled"),
        "H335" => Some("May cause respiratory irritation"),
        "H336" => Some("May cause drowsiness or dizziness"),
        "H340" => Some("May cause genetic defects"),
        "H341" => Some("Suspected of causing genetic defects"),
        "H350" => Some("May cause cancer"),
        "H351" => Some("Suspected of causing cancer"),
        "H360" => Some("May damage fertility or the unborn child"),
        "H361" => Some("Suspected of damaging fertility or the unborn child"),
        "H362" => Some("May cause harm to breast-fed children"),
        "H370" => Some("Causes damage to organs"),
        "H371" => Some("May cause damage to organs"),
        "H372" => Some("Causes damage to organs through prolonged or repeated exposure"),
        "H373" => Some("May cause damage to organs through prolonged or repeated exposure"),
        "H400" => Some("Very toxic to aquatic life"),
        "H401" => Some("Toxic to aquatic life"),
        "H402" => Some("Harmful to aquatic life"),
        "H410" => Some("Very toxic to aquatic life with long lasting effects"),
        "H411" => Some("Toxic to aquatic life with long lasting effects"),
        "H412" => Some("Harmful to aquatic life with long lasting effects"),
        "H413" => Some("May cause long lasting harmful effects to aquatic life"),
        "H420" => Some("Harms public health and the environment by destroying ozone in the upper atmosphere"),
        _ => None,
    }
}

pub fn p_code_description(code: &str) -> Option<&'static str> {
    match code {
        "P101" => Some("If medical advice is needed, have product container or label at hand"),
        "P102" => Some("Keep out of reach of children"),
        "P103" => Some("Read carefully and follow all instructions"),
        "P201" => Some("Obtain special instructions before use"),
        "P202" => Some("Do not handle until all safety precautions have been read and understood"),
        "P210" => Some("Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking"),
        "P211" => Some("Do not spray on an open flame or other ignition source"),
        "P212" => Some("Avoid heating under confinement or reduction of desensitized agent"),
        "P220" => Some("Keep away from clothing and other combustible materials"),
        "P221" => Some("Take precautionary measures against mixing with combustibles"),
        "P222" => Some("Do not allow contact with air"),
        "P223" => Some("Keep away from any possible contact with water"),
        "P230" => Some("Keep wetted with specified agent"),
        "P231" => Some("Handle under inert gas"),
        "P232" => Some("Protect from moisture"),
        "P233" => Some("Keep container tightly closed"),
        "P234" => Some("Keep only in original packaging"),
        "P235" => Some("Keep cool"),
        "P240" => Some("Ground and bond container and receiving equipment"),
        "P241" => Some("Use explosion-proof equipment"),
        "P242" => Some("Use non-sparking tools"),
        "P243" => Some("Take precautionary measures against static discharge"),
        "P244" => Some("Keep valves and fittings free from oil and grease"),
        "P250" => Some("Do not subject to grinding/shock/friction"),
        "P251" => Some("Do not pierce or burn, even after use"),
        "P260" => Some("Do not breathe dust/fume/gas/mist/vapours/spray"),
        "P261" => Some("Avoid breathing dust/fume/gas/mist/vapours/spray"),
        "P262" => Some("Do not get in eyes, on skin, or on clothing"),
        "P263" => Some("Avoid contact during pregnancy and while nursing"),
        "P264" => Some("Wash thoroughly after handling"),
        "P270" => Some("Do not eat, drink or smoke when using this product"),
        "P271" => Some("Use only outdoors or in a well-ventilated area"),
        "P272" => Some("Contaminated work clothing should not be allowed out of the workplace"),
        "P273" => Some("Avoid release to the environment"),
        "P280" => Some("Wear protective gloves/protective clothing/eye protection/face protection"),
        "P281" => Some("Use personal protective equipment as required"),
        "P282" => Some("Wear cold insulating gloves and either face shield or eye protection"),
        "P283" => Some("Wear fire-resistant/flame-retardant clothing"),
        "P284" => Some("In case of inadequate ventilation wear respiratory protection"),
        "P285" => Some("In case of inadequate ventilation use respiratory protection"),
        "P301" => Some("IF SWALLOWED"),
        "P302" => Some("IF ON SKIN"),
        "P303" => Some("IF ON SKIN (or hair)"),
        "P304" => Some("IF INHALED"),
        "P305" => Some("IF IN EYES"),
        "P306" => Some("IF ON CLOTHING"),
        "P307" => Some("IF exposed"),
        "P308" => Some("IF exposed or concerned"),
        "P309" => Some("IF exposed or if you feel unwell"),
        "P310" => Some("Immediately call a POISON CENTER or doctor/physician"),
        "P311" => Some("Call a POISON CENTER or doctor/physician"),
        "P312" => Some("Call a POISON CENTER or doctor/physician if you feel unwell"),
        "P313" => Some("Get medical advice/attention"),
        "P314" => Some("Get medical advice/attention if you feel unwell"),
        "P315" => Some("Get immediate medical advice/attention"),
        "P320" => Some("Specific treatment is urgent"),
        "P321" => Some("Specific treatment (see supplemental first aid instructions)"),
        "P322" => Some("Specific measures (see supplemental instructions)"),
        "P330" => Some("Rinse mouth"),
        "P331" => Some("Do NOT induce vomiting"),
        "P332" => Some("If skin irritation occurs: Get medical advice/attention"),
        "P333" => Some("If skin irritation or rash occurs: Get medical advice/attention"),
        "P334" => Some("Immerse in cool water or wrap in wet bandages"),
        "P335" => Some("Brush off loose particles from skin"),
        "P336" => Some("Thaw frosted parts with lukewarm water"),
        "P337" => Some("If eye irritation persists: Get medical advice/attention"),
        "P338" => Some("Remove contact lenses, if present and easy to do. Continue rinsing"),
        "P340" => Some("Remove victim to fresh air and keep at rest in a position comfortable for breathing"),
        "P341" => Some("If breathing is difficult, remove victim to fresh air and keep at rest"),
        "P342" => Some("If experiencing respiratory symptoms: Call a POISON CENTER or doctor/physician"),
        "P350" => Some("Gently wash with plenty of soap and water"),
        "P351" => Some("Rinse cautiously with water for several minutes"),
        "P352" => Some("Wash with plenty of water"),
        "P353" => Some("Rinse skin with water or shower"),
        "P360" => Some("Rinse immediately contaminated clothing and skin with plenty of water before removing clothes"),
        "P361" => Some("Take off immediately all contaminated clothing"),
        "P362" => Some("Take off contaminated clothing and wash before reuse"),
        "P363" => Some("Wash contaminated clothing before reuse"),
        "P364" => Some("And wash it before reuse"),
        "P370" => Some("In case of fire"),
        "P371" => Some("In case of major fire and large quantities"),
        "P372" => Some("Explosion risk"),
        "P373" => Some("DO NOT fight fire when fire reaches explosives"),
        "P374" => Some("Fight fire with normal precautions from a reasonable distance"),
        "P375" => Some("Fight fire remotely due to the risk of explosion"),
        "P376" => Some("Stop leak if safe to do so"),
        "P377" => Some("Leaking gas fire: Do not extinguish, unless leak can be stopped safely"),
        "P378" => Some("Use appropriate fire-fighting media"),
        "P380" => Some("Evacuate area"),
        "P381" => Some("In case of leakage, eliminate all ignition sources"),
        "P390" => Some("Absorb spillage to prevent material damage"),
        "P391" => Some("Collect spillage"),
        "P401" => Some("Store in accordance with applicable regulations"),
        "P402" => Some("Store in a dry place"),
        "P403" => Some("Store in a well-ventilated place"),
        "P404" => Some("Store in a closed container"),
        "P405" => Some("Store locked up"),
        "P406" => Some("Store in corrosive-resistant container with a resistant inner liner"),
        "P407" => Some("Maintain air gap between stacks or pallets"),
        "P410" => Some("Protect from sunlight"),
        "P411" => Some("Store at temperatures not exceeding specified temperature"),
        "P412" => Some("Do not expose to temperatures exceeding 50°C/122°F"),
        "P413" => Some("Store bulk masses greater than specified mass at temperatures not exceeding specified temperature"),
        "P420" => Some("Store separately"),
        "P422" => Some("Store contents under specified conditions"),
        "P501" => Some("Dispose of contents/container in accordance with local regulations"),
        "P502" => Some("Refer to manufacturer or supplier for information on recovery or recycling"),
        "P503" => Some("Refer to manufacturer/supplier/competent authority for information on recovery or recycling"),
        _ => None,
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn valid_h_codes() {
        assert!(is_valid_h_code("H200"));
        assert!(is_valid_h_code("H315"));
        assert!(is_valid_h_code("H420"));
        assert!(!is_valid_h_code("H999"));
        assert!(!is_valid_h_code("H"));
        assert!(!is_valid_h_code(""));
    }

    #[test]
    fn valid_p_codes() {
        assert!(is_valid_p_code("P101"));
        assert!(is_valid_p_code("P501"));
        assert!(!is_valid_p_code("P999"));
    }

    #[test]
    fn compound_p_codes() {
        assert!(is_valid_p_code("P301+P330+P331"));
        assert!(is_valid_p_code("P305+P351+P338"));
        assert!(!is_valid_p_code("P301+P999"));
    }

    #[test]
    fn h_code_descriptions() {
        assert_eq!(h_code_description("H315"), Some("Causes skin irritation"));
        assert_eq!(h_code_description("H400"), Some("Very toxic to aquatic life"));
        assert!(h_code_description("H999").is_none());
    }

    #[test]
    fn p_code_descriptions() {
        assert!(p_code_description("P101").is_some());
        assert!(p_code_description("P501").is_some());
        assert!(p_code_description("P999").is_none());
    }

    #[test]
    fn h_codes_sorted() {
        // Ensure binary_search works (slice must be sorted)
        let mut sorted = H_CODES.to_vec();
        sorted.sort_unstable();
        assert_eq!(H_CODES, sorted.as_slice());
    }

    #[test]
    fn p_codes_sorted() {
        let mut sorted = P_CODES.to_vec();
        sorted.sort_unstable();
        assert_eq!(P_CODES, sorted.as_slice());
    }
}
