#include "errors.h"

static const char* error_msgs[] = {
    [ERR_UNKNOWN]          = "error: something unexpected happened",
    [ERR_UNMATCHED_STRING] = "error: unmatched string delimiter",
    [ERR_UNMATCHED_PAREN]  = "error: unbalanced parentheses",
    [ERR_UNKNOWN_TOK_TYPE] = "error: unknown token type",
    [ERR_MALFORMED_NUMBER] = "error: malformed number token",
    [ERR_MALFORMED_EXPR]   = "error: malformed expression",
    [ERR_UNIMPLEMENTED]    = "error: not implemented",
    [ERR_NOT_A_NUMBER]     = "error: expected a number",
    [ERR_NOT_A_SYMBOL]     = "error: expected a symbol",
    [ERR_NOT_A_STRING]     = "error: expected a string",
    [ERR_NOT_A_TYPE]       = "error: expected a type",
    [ERR_NOT_A_BOOL]       = "error: expected a bool",
    [ERR_NOT_A_LPAREN]     = "error: expected opening parentheses (lparen)",
    [ERR_NOT_A_RPAREN]     = "error: expected closing parentheses (rparen)",
    [ERR_SYMBOL_REDEF]     = "error: symbol redefinition",
    [ERR_UNKNOWN_SYMBOL]   = "error: unknown symbol",
    [ERR_TYPE_REDEF]       = "error: type redefinition",
    [ERR_UNKNOWN_TYPE]     = "error: unknown type",
    [ERR_WRONG_RET_TYPE]   = "error: return type don't match type signature",
    [ERR_WRONG_COND_TYPE]  = "error: conditional expression is not boolean",
    [ERR_WRONG_TYPE_T_F]   = "error: unmatched types between true and false expression",
    [ERR_WRONG_TYPE_NUM]   = "error: non numeric argument types",
    [ERR_WRONG_TYPE_BOOL]  = "error: non bool argument types",
    [ERR_WRONG_TYPE_FUN]   = "error: not a function",
    [ERR_BAD_ARGS]         = "error: arguments don't match expected types",
    [ERR_TYPE_MISMATCH]    = "error: type mismatch",
};

static Error current_error = {.value = ERR_OK};

void
push_error(ErrorType type, ErrorValue value, size_t line, size_t col) {
    if (has_errors()) {
        return;
    }
    current_error.type = type;
    current_error.value = value;
    current_error.line = line;
    current_error.col = col;
}

bool
has_errors(void) {
    return current_error.value != ERR_OK;
}

void
check_errors(const char *file_name) {
    if (!has_errors()) {
        return;
    }
    fprintf(stderr, "%s", file_name);
    if (current_error.line != 0) {
        fprintf(stderr, ":%ld:%ld", current_error.line, current_error.col);
    }
    switch (current_error.type) {
        case ERR_TYPE_LEXER:    { fprintf(stderr, ": [lexer] ");    } break;
        case ERR_TYPE_PARSER:   { fprintf(stderr, ": [parser] ");   } break;
        default: break;
    }
    fprintf(stderr, "%s\n", error_msgs[current_error.value]);
    exit(EXIT_FAILURE);
}