from libcpp cimport bool

cdef extern from "lm/word_index.hh" namespace "lm":
    ctypedef unsigned WordIndex

cdef extern from "lm/return.hh" namespace "lm":
    cdef struct FullScoreReturn:
        float prob
        unsigned char ngram_length

cdef extern from "lm/state.hh" namespace "lm::ngram":
    cdef cppclass State :
        int Compare(const State &other) const

    int hash_value(const State &state) 

cdef extern from "lm/virtual_interface.hh" namespace "lm::base":
    cdef cppclass Vocabulary:
        WordIndex Index(char*)
        WordIndex BeginSentence() 
        WordIndex EndSentence()
        WordIndex NotFound()

    ctypedef Vocabulary const_Vocabulary "const lm::base::Vocabulary"

    cdef cppclass Model:
        void BeginSentenceWrite(void *)
        void NullContextWrite(void *)
        unsigned int Order()
        const_Vocabulary& BaseVocabulary()
        float BaseScore(void *in_state, WordIndex new_word, void *out_state)
        FullScoreReturn BaseFullScore(void *in_state, WordIndex new_word, void *out_state)

cdef extern from "util/mmap.hh" namespace "util":
    cdef enum LoadMethod:
        LAZY
        POPULATE_OR_LAZY
        POPULATE_OR_READ
        READ
        PARALLEL_READ

cdef extern from "lm/config.hh" namespace "lm::ngram::Config":
    cdef enum ARPALoadComplain:
        ALL
        EXPENSIVE
        NONE

cdef extern from "lm/config.hh" namespace "lm::ngram":
    cdef cppclass Config:
        Config()
        float probing_multiplier
        LoadMethod load_method
        bool show_progress
        ARPALoadComplain arpa_complain
        float unknown_missing_logprob

cdef extern from "lm/model.hh" namespace "lm::ngram":
    cdef Model *LoadVirtual(char *, Config &config) except +
    #default constructor
    cdef Model *LoadVirtual(char *) except +

cdef extern from "python/score_sentence.hh" namespace "lm::base":
    cdef float ScoreSentence(const Model *model, const char *sentence)