#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);
}

typedef enum {
    MAP_TYPE_UNKNOWN,
    MAP_TYPE_LIST,
    MAP_TYPE_MAP
} MapType;

static int tsl_parser_parse_map(TslParser *self) {
    MapType map_type = MAP_TYPE_UNKNOWN;
    for(;;) {
        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);
            token = tsl_tokenizer_next(&self->tokenizer);
            if(token == TSL_TOKEN_COMMA) {
                if(map_type == MAP_TYPE_MAP) {
                    /* TODO: Show which lines have mismatching element types */
                    fprintf(stderr, "Error: You can't mix list elements and map elements in the same map\n");
                    return -1;
                }
                map_type = MAP_TYPE_LIST;
            } else if(token == TSL_TOKEN_COLON) {
                if(map_type == MAP_TYPE_LIST) {
                    /* TODO: Show which lines have mismatching element types */
                    fprintf(stderr, "Error: You can't mix list elements and map elements in the same map\n");
                    return -1;
                }
                map_type = MAP_TYPE_LIST;
            } else if(token == TSL_TOKEN_RBRACE) {
                if(map_type == MAP_TYPE_MAP) {
                    /* TODO: Show why ':' is needed (because other elements in the map are map types) */
                    fprintf(stderr, "Error: Expected ':', got '}'\n");
                    return -1;
                }
                return 0;
            } else {
                /* TODO: Show only "expects '}' when not using key-value pair" */
                fprintf(stderr, "Error: Expected ',', ':' or '}', got TODO\n");
                return -1;
            }
        } else if(token == TSL_TOKEN_RBRACE) {
            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 {
        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);
}