#include "arc/std/parser/csv.h"
#include "arc/std/parser/helpers.h"
#include "arc/std/bool.h"
#include "arc/std/parser.h"
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>

typedef struct ARC_ParserCSVUserData {
    ARC_Bool header;
    ARC_ParserCSV_CastTypeFn    castTypeFn;
    ARC_ParserCSV_DestroyTypeFn destroyTypeFn;
} ARC_ParserCSVUserData;

void ARC_ParserCSV_InitLexerRulesFn(ARC_Lexer *lexer){

}

uint32_t ARC_ParserCSV_GetStringIdFn(ARC_String *string){
    if(ARC_String_EqualsCStringWithStrlen(string, "LAMBDA")){
        return ARC_PARSER_TAG_LAMBDA;
    }

    return ~(uint32_t)0;
}

void ARC_ParserCSVData_VectorDestroyVectorFn(void *data){
    ARC_Vector *vector = (ARC_Vector *)data;
    ARC_Vector_Destroy(vector);
}

void ARC_ParserCSVData_GetDataTag(ARC_Vector *dataVector, ARC_ParserTagToken *tagToken, ARC_ParserCSVUserData *userData){
    //cast the csv data back to its original type
    ARC_ParserCSVUserData *csvUserData = (ARC_ParserCSVUserData *)userData;

    //loop through the tags either recursing to next body or adding data to vector
    for(uint32_t index = 0; index < ARC_Vector_GetSize(tagToken->tagTokens); index++){
        ARC_ParserTagToken *childTagToken = (ARC_ParserTagToken *)ARC_Vector_Get(tagToken->tagTokens, index);

        ARC_String *stringData = NULL;
        ARC_Vector *row        = NULL;
        uint32_t    rowIndex   = 0;

        switch(childTagToken->id){
            //recuse to run the next line
            case ARC_PARSER_CSV_STRING:
                //get the string of the data
                ARC_String_Create(&stringData, NULL, 0);
                ARC_ParserData_HelperRecurseStringAdd(&stringData, childTagToken);

                //move data string and cleanup
                void *data = (void *)stringData;

                //get the last row vector
                rowIndex = ARC_Vector_GetSize(dataVector) - 1;
                row = (ARC_Vector *)ARC_Vector_Get(dataVector, rowIndex);

                //only call the userData cast type callback if it is not a header
                if(rowIndex != 0 || csvUserData->header == ARC_False){
                    data = NULL;
                    userData->castTypeFn(&data, stringData);
                    ARC_String_Destroy(stringData);
                }

                //add the data to the row vector
                ARC_Vector_Add(row, data);
                continue;

            case ARC_PARSER_CSV_DATA:
                ARC_ParserCSVData_GetDataTag(dataVector, childTagToken, userData);
                continue;

            default:
                //this should only be the case for the comma
                continue;
        }
    }
}

//<line>   -> <data> NEWLINE <line> | <data> | NEWLINE <line> | LAMBDA
void ARC_ParserCSVData_RunLineTag(ARC_Vector *dataVector, ARC_ParserTagToken *tagToken, ARC_ParserCSVUserData *userData){
    //loop through the tags either going to the next line or the next body
    for(uint32_t index = 0; index < ARC_Vector_GetSize(tagToken->tagTokens); index++){
        ARC_ParserTagToken *childTagToken = (ARC_ParserTagToken *)ARC_Vector_Get(tagToken->tagTokens, index);

        ARC_Vector *row        = NULL;
        uint32_t    rowIndex   = 0;

        switch(childTagToken->id){
            //recuse to run the next line
            case ARC_PARSER_CSV_LINE:
                ARC_ParserCSVData_RunLineTag(dataVector, childTagToken, userData);
                continue;

            //get the row data
            case ARC_PARSER_CSV_DATA:
                ARC_ParserCSVData_GetDataTag(dataVector, childTagToken, userData);
                continue;

            //add a new row for each new line
            case ARC_PARSER_CSV_CHAR_NEWLINE:
                //check if current is not empty (no need to create another empty row)
                rowIndex = ARC_Vector_GetSize(dataVector) - 1;
                row = (ARC_Vector *)ARC_Vector_Get(dataVector, rowIndex);
                if(ARC_Vector_GetSize(row) == 0){
                    continue;
                }

                //create and add a new row
                ARC_Vector_Create(&row, NULL, NULL);
                ARC_Vector_Add(dataVector, (void *)row);
                continue;

            default:
                continue;
        }
    }
}

void ARC_ParserCSVData_CreateFn(void **data, ARC_ParserTagToken *parsedData, void *userData){
    *data = NULL;
    if(data == NULL || userData == NULL){
        //TODO: error here?
        *data = NULL;
        return;
    }

    //cast the csv data back to its original type
    ARC_ParserCSVUserData *csvUserData = (ARC_ParserCSVUserData *)userData;

    //crate a vector for the data to be stored in before being copied to a 2d array
    ARC_Vector *dataVector;
    ARC_Vector_DestroyDataFn destroyVectorFn = ARC_ParserCSVData_VectorDestroyVectorFn;
    ARC_Vector_Create(&dataVector, NULL, &destroyVectorFn);

    //create the first row vector, does not need a destroy function as its contents will be moved
    ARC_Vector *dataRowVector;
    ARC_Vector_Create(&dataRowVector, NULL, NULL);

    //add the row to the dataVector
    ARC_Vector_Add(dataVector, (void *)dataRowVector);

    //recursively add data from the parsedData to the data vector
    ARC_ParserCSVData_RunLineTag(dataVector, parsedData, csvUserData);

    //get the first line to check if it has any values
    dataRowVector = ARC_Vector_Get(dataVector, 0);
    if(ARC_Vector_GetSize(dataRowVector) == 0){
        //TODO: iterate and clear the vector
        ARC_Vector_Destroy(dataVector);
        return;
    }

    //create the data that will be saved
    ARC_ParserCSVData *csvData = (ARC_ParserCSVData *)malloc(sizeof(ARC_ParserCSVData));
    csvData->hasHeader = csvUserData->header;
    csvData->headers   = NULL;
    csvData->height    = 0;
    csvData->width     = ARC_Vector_GetSize(dataRowVector);
    csvData->data      = NULL;

    //create the starting index (to offset the header if it exists)
    uint32_t heightStartIndex = 0;

    //store the headers if they exist
    if(csvData->hasHeader == ARC_True){
        heightStartIndex++;

        //copy the headers
        csvData->headers = (ARC_String **)malloc(sizeof(ARC_String *) * csvData->width);
        for(uint32_t headerIndex = 0; headerIndex < csvData->width; headerIndex++){
            csvData->headers[headerIndex] = (ARC_String *)ARC_Vector_Get(dataRowVector, headerIndex);
        }
    }

    //check that all the rows are the same size
    for(uint32_t rowIndex = heightStartIndex; rowIndex < ARC_Vector_GetSize(dataVector); rowIndex++){
        ARC_Vector *currentRowVector = (ARC_Vector *)ARC_Vector_Get(dataVector, rowIndex);

        //skip an empty line (this should only be the case for the last line)
        uint32_t currentRowVectorSize = ARC_Vector_GetSize(currentRowVector);
        if(currentRowVectorSize == 0){
            continue;
        }

        //a row was found so update the height
        csvData->height++;

        //TODO: probs want to error
        //cleanup and exit if they don't match
        if(csvData->width != currentRowVectorSize){
            //TODO: iterate and clear the vector
            ARC_Vector_Destroy(dataVector);
            return;
        }
    }

    //init location to copy data to
    csvData->data = (void ***)malloc(sizeof(void **) * csvData->height);

    //copy the data
    uint32_t rowIndex = 0;
    for(uint32_t y = 0; y < csvData->height; y++, rowIndex++){
        ARC_Vector *currentRowVector = (ARC_Vector *)ARC_Vector_Get(dataVector, rowIndex + heightStartIndex);

        //skip an empty line (should only be the case for the last line)
        uint32_t currentRowVectorSize = ARC_Vector_GetSize(currentRowVector);
        if(currentRowVectorSize == 0){
            y--;
            continue;
        }

        //create the current row
        csvData->data[y] = (void **)malloc(sizeof(void *) * csvData->width);

        for(uint32_t x = 0; x < csvData->width; x++){
            csvData->data[y][x] = ARC_Vector_Get(currentRowVector, x);
        }
    }

    ARC_Vector_Destroy(dataVector);

    *data = (void *)csvData;
}

void ARC_ParserCSVData_DestroyFn(void *data, ARC_Bool clear, void *userData){
    if(userData == NULL){
        return;
    }

    ARC_ParserCSVUserData *csvUserData = (ARC_ParserCSVUserData *)userData;

    if(data != NULL){
        ARC_ParserCSVData *csvData = (ARC_ParserCSVData *)data;

        //cleanup the headers if they exist
        if(csvData->hasHeader == ARC_True){
            for(uint32_t x = 0; x < csvData->width; x++){
                ARC_String *string = csvData->headers[x];
                ARC_String_Destroy(string);
            }
            free(csvData->headers);
        }

        for(uint32_t y = 0; y < csvData->height; y++){
            //cleanup each element in the data
            for(uint32_t x = 0; x < csvData->width; x++){
                csvUserData->destroyTypeFn(csvData->data[y][x]);
            }

            //cleanup each row of data
            free(csvData->data[y]);
        }

        //cleanup the data
        free(csvData->data);
        free(csvData);
    }

    if(clear == ARC_False){
        free(csvUserData);
    }
}

void ARC_ParserCSV_CreateAsParser(ARC_Parser **parser, ARC_Bool header, ARC_ParserCSV_CastTypeFn castTypeFn, ARC_ParserCSV_DestroyTypeFn destroyTypeFn){
    /* ~ define the language as a string ~ */
    char *languageCString =
        "<line>         -> <data> NEWLINE <line> | <data> | NEWLINE <line> | LAMBDA\n"
        "<data>         -> <string> COMMA <data> | <string>\n"
        "<string>       -> <nonCommaChar> <string> | <nonCommaChar>\n"
        "<nonCommaChar> -> CHAR_BEFORE_COMMA | CHAR_AFTER_COMMA\n";

    ARC_String *languageString;
    ARC_String_CreateWithStrlen(&languageString, languageCString);

    /* ~ init the userdata ~ */
    ARC_ParserCSVUserData *userdata = (ARC_ParserCSVUserData *)malloc(sizeof(ARC_ParserCSVUserData));
    userdata->header                = header;
    userdata->castTypeFn            = castTypeFn;
    userdata->destroyTypeFn         = destroyTypeFn;

    /* ~ create the language ~ */
    ARC_ParserData_CreateFn  createCharFn  = ARC_ParserCSVData_CreateFn;
    ARC_ParserData_DestroyFn destroyCharFn = ARC_ParserCSVData_DestroyFn;
    ARC_Parser_CreateFromString(parser, languageString, ARC_ParserCSV_InitLexerRulesFn, ARC_ParserCSV_GetStringIdFn, &createCharFn, &destroyCharFn, userdata);

    //cleanup
    ARC_String_Destroy(languageString);
}