#include "../include/parser.h"
#include <stdio.h>

typedef struct {
    TslTokenizer tokenizer;
} TslParser;

static void tsl_parser_init(TslParser *self, const char *code, size_t code_size) {
    tsl_tokenizer_init(&self->tokenizer, code, code_size);
}

static int tsl_parser_parse_map(TslParser *self) {
#define parse_map_element_separator                                     \
    if(!tsl_tokenizer_accept(&self->tokenizer, TSL_TOKEN_COLON))        \
        return -1;                                                      \
    token = tsl_tokenizer_next(&self->tokenizer);                       \
    if(token == TSL_TOKEN_COMMA) {                                      \
        continue;                                                       \
    } else if(token == TSL_TOKEN_RBRACE) {                              \
        return 0;                                                       \
    } else {                                                            \
        fprintf(stderr, "Error: Expected ',' or '}', got TODO\n");      \
        return -1;                                                      \
    }

    for(;;) {
        TslToken token = tsl_tokenizer_next(&self->tokenizer);
        if(token == TSL_TOKEN_NUM) {
            printf("rhs num: %ld\n", self->tokenizer.number_value);
            parse_map_element_separator
        } else if(token == TSL_TOKEN_BOOL) {
            printf("rhs bool: %s\n", self->tokenizer.bool_value ? "true" : "false");
            parse_map_element_separator
        } else if(token == TSL_TOKEN_NULL) {
            printf("rhs null\n");
            parse_map_element_separator
        } else if(token == TSL_TOKEN_STRING) {
            printf("rhs string: |%.*s|\n", self->tokenizer.string.size, self->tokenizer.string.data);
            parse_map_element_separator
        } else if(token == TSL_TOKEN_RBRACE) {
            /* '}' after trailing ',' or an empty map */
            return 0;
        } else {
            fprintf(stderr, "Error: Expected '}', got TODO\n");
            return -1;
        }

        token = tsl_tokenizer_next(&self->tokenizer);
    }
}

static int tsl_parser_parse_list(TslParser *self) {
#define parse_list_element_separator                                    \
    token = tsl_tokenizer_next(&self->tokenizer);                       \
    if(token == TSL_TOKEN_COMMA) {                                      \
        continue;                                                       \
    } else if(token == TSL_TOKEN_RBRACKET) {                            \
        return 0;                                                       \
    } else {                                                            \
        fprintf(stderr, "Error: Expected ',' or ']', got TODO\n");      \
        return -1;                                                      \
    }

    for(;;) {
        TslToken token = tsl_tokenizer_next(&self->tokenizer);
        if(token == TSL_TOKEN_NUM) {
            printf("rhs num: %ld\n", self->tokenizer.number_value);
            parse_list_element_separator
        } else if(token == TSL_TOKEN_BOOL) {
            printf("rhs bool: %s\n", self->tokenizer.bool_value ? "true" : "false");
            parse_list_element_separator
        } else if(token == TSL_TOKEN_NULL) {
            printf("rhs null\n");
            parse_list_element_separator
        } else if(token == TSL_TOKEN_STRING) {
            printf("rhs string: |%.*s|\n", self->tokenizer.string.size, self->tokenizer.string.data);
            parse_list_element_separator
        } else if(token == TSL_TOKEN_RBRACKET) {
            /* ']' after trailing ',' or an empty list */
            return 0;
        } else {
            fprintf(stderr, "Error: Expected '}', got TODO\n");
            return -1;
        }
    }
}

static int tsl_parser_parse_rhs(TslParser *self) {
    TslToken token = tsl_tokenizer_next(&self->tokenizer);
    if(token == TSL_TOKEN_NUM) {
        printf("rhs num: %ld\n", self->tokenizer.number_value);
    } else if(token == TSL_TOKEN_BOOL) {
        printf("rhs bool: %s\n", self->tokenizer.bool_value ? "true" : "false");
    } else if(token == TSL_TOKEN_NULL) {
        printf("rhs null\n");
    } else if(token == TSL_TOKEN_STRING) {
        printf("rhs string: |%.*s|\n", self->tokenizer.string.size, self->tokenizer.string.data);
    } else if(token == TSL_TOKEN_LBRACE) {
        tsl_parser_parse_map(self);
    } else if(token == TSL_TOKEN_LBRACKET) {
        tsl_parser_parse_list(self);
    } else {
        fprintf(stderr, "Error: Expected number, bool or null, got TODO\n");
        return -1;
    }
    return 0;
}

static int tsl_parser_parse(TslParser *self) {
    for(;;) {
        TslToken token = tsl_tokenizer_next(&self->tokenizer);
        if(token == TSL_TOKEN_IDENTIFIER) {
            TslStringView identifier = self->tokenizer.identifier;
            printf("identifier: %.*s\n", identifier.size, identifier.data);
            if(!tsl_tokenizer_accept(&self->tokenizer, TSL_TOKEN_EQUAL)) {
                return -1;
            }
            if(tsl_parser_parse_rhs(self) != 0) {
                return -1;
            }
        } else if(token == TSL_TOKEN_END_OF_FILE) {
            break;
        } else {
            fprintf(stderr, "Error: Expected identifier, got TODO\n");
            return -1;
        }
    }
    return 0;
}

int tsl_parse(const char *code, size_t code_size) {
    TslParser parser;
    tsl_parser_init(&parser, code, code_size);
    return tsl_parser_parse(&parser);
}