/*
 * Copyright (C) 2012, 2013, 2014, 2015
 *     Dale Weiler
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <stdio.h>
#include "gmqcc.h"

#define GMQCC_IS_STDOUT(X) ((fs_file_t*)((void*)X) == (fs_file_t*)stdout)
#define GMQCC_IS_STDERR(X) ((fs_file_t*)((void*)X) == (fs_file_t*)stderr)
#define GMQCC_IS_DEFINE(X) (GMQCC_IS_STDERR(X) || GMQCC_IS_STDOUT(X))

typedef struct {
    fs_file_t *handle_err;
    fs_file_t *handle_out;
    int        color_err;
    int        color_out;
} con_t;

/*
 * We use standard files as default. These can be changed at any time
 * with con_change(F, F)
 */
static con_t console;

/*
 * Enables color on output if supported.
 * NOTE: The support for checking colors is NULL.  On windows this will
 * always work, on *nix it depends if the term has colors.
 *
 * NOTE: This prevents colored output to piped stdout/err via isatty
 * checks.
 */
static void con_enablecolor(void) {
    console.color_err = util_isatty(console.handle_err);
    console.color_out = util_isatty(console.handle_out);
}

/*
 * Does a write to the handle with the format string and list of
 * arguments.  This colorizes for windows as well via translate
 * step.
 */
static int con_write(fs_file_t *handle, const char *fmt, va_list va) {
    return vfprintf((FILE*)handle, fmt, va);
}

/**********************************************************************
 * EXPOSED INTERFACE BEGINS
 *********************************************************************/

void con_close() {
    if (!GMQCC_IS_DEFINE(console.handle_err))
        fs_file_close(console.handle_err);
    if (!GMQCC_IS_DEFINE(console.handle_out))
        fs_file_close(console.handle_out);
}

void con_color(int state) {
    if (state)
        con_enablecolor();
    else {
        console.color_err = 0;
        console.color_out = 0;
    }
}

void con_init() {
    console.handle_err = (fs_file_t*)stderr;
    console.handle_out = (fs_file_t*)stdout;
    con_enablecolor();
}

void con_reset() {
    con_close();
    con_init ();
}

/*
 * This is clever, say you want to change the console to use two
 * files for out/err.  You pass in two strings, it will properly
 * close the existing handles (if they're not std* handles) and
 * open them.  Now say you want TO use stdout and stderr, this
 * allows you to do that so long as you cast them to (char*).
 * Say you need stdout for out, but want a file for error, you can
 * do this too, just cast the stdout for (char*) and stick to a
 * string for the error file.
 */
int con_change(const char *out, const char *err) {
    con_close();

    if (!out) out = (const char *)((!console.handle_out) ? (fs_file_t*)stdout : console.handle_out);
    if (!err) err = (const char *)((!console.handle_err) ? (fs_file_t*)stderr : console.handle_err);

    if (GMQCC_IS_DEFINE(out)) {
        console.handle_out = (fs_file_t*)(GMQCC_IS_STDOUT(out) ? stdout : stderr);
        con_enablecolor();
    } else if (!(console.handle_out = fs_file_open(out, "w"))) return 0;

    if (GMQCC_IS_DEFINE(err)) {
        console.handle_err = (fs_file_t*)(GMQCC_IS_STDOUT(err) ? stdout : stderr);
        con_enablecolor();
    } else if (!(console.handle_err = fs_file_open(err, "w"))) return 0;

    return 1;
}

/*
 * Defaultizer because stdio.h shouldn't be used anywhere except here
 * and inside file.c To prevent mis-match of wrapper-interfaces.
 */
fs_file_t *con_default_out() {
    return (fs_file_t*)(console.handle_out = (fs_file_t*)stdout);
}
fs_file_t *con_default_err() {
    return (fs_file_t*)(console.handle_err = (fs_file_t*)stderr);
}

int con_verr(const char *fmt, va_list va) {
    return con_write(console.handle_err, fmt, va);
}
int con_vout(const char *fmt, va_list va) {
    return con_write(console.handle_out, fmt, va);
}

/*
 * Standard stdout/stderr printf functions used generally where they need
 * to be used.
 */
int con_err(const char *fmt, ...) {
    va_list  va;
    int      ln = 0;
    va_start(va, fmt);
    con_verr(fmt, va);
    va_end  (va);
    return   ln;
}
int con_out(const char *fmt, ...) {
    va_list  va;
    int      ln = 0;
    va_start(va, fmt);
    con_vout(fmt, va);
    va_end  (va);
    return   ln;
}

/*
 * Utility console message writes for lexer contexts.  These will allow
 * for reporting of file:line based on lexer context, These are used
 * heavily in the parser/ir/ast.
 */
static void con_vprintmsg_c(int level, const char *name, size_t line, size_t column, const char *msgtype, const char *msg, va_list ap, const char *condname) {
    /* color selection table */
    static int sel[] = {
        CON_WHITE,
        CON_CYAN,
        CON_RED
    };

    int  err                             = !!(level == LVL_ERROR);
    int  color                           = (err) ? console.color_err : console.color_out;
    int (*print) (const char *, ...)     = (err) ? &con_err          : &con_out;
    int (*vprint)(const char *, va_list) = (err) ? &con_verr         : &con_vout;

    if (color)
        print("\033[0;%dm%s:%d:%d: \033[0;%dm%s: \033[0m", CON_CYAN, name, (int)line, (int)column, sel[level], msgtype);
    else
        print("%s:%d:%d: %s: ", name, (int)line, (int)column, msgtype);

    vprint(msg, ap);
    if (condname)
        print(" [%s]\n", condname);
    else
        print("\n");
}

void con_vprintmsg(int level, const char *name, size_t line, size_t column, const char *msgtype, const char *msg, va_list ap) {
    con_vprintmsg_c(level, name, line, column, msgtype, msg, ap, NULL);
}

void con_printmsg(int level, const char *name, size_t line, size_t column, const char *msgtype, const char *msg, ...) {
    va_list   va;
    va_start(va, msg);
    con_vprintmsg(level, name, line, column, msgtype, msg, va);
    va_end  (va);
}

void con_cvprintmsg(lex_ctx_t ctx, int lvl, const char *msgtype, const char *msg, va_list ap) {
    con_vprintmsg(lvl, ctx.file, ctx.line, ctx.column, msgtype, msg, ap);
}

void con_cprintmsg(lex_ctx_t ctx, int lvl, const char *msgtype, const char *msg, ...) {
    va_list   va;
    va_start(va, msg);
    con_cvprintmsg(ctx, lvl, msgtype, msg, va);
    va_end  (va);
}

/* General error interface: TODO seperate as part of the compiler front-end */
size_t compile_errors   = 0;
size_t compile_warnings = 0;
size_t compile_Werrors  = 0;
static lex_ctx_t first_werror;

void compile_show_werrors()
{
    con_cprintmsg(first_werror, LVL_ERROR, "first warning", "was here");
}

void vcompile_error(lex_ctx_t ctx, const char *msg, va_list ap)
{
    ++compile_errors;
    con_cvprintmsg(ctx, LVL_ERROR, "error", msg, ap);
}

void compile_error(lex_ctx_t ctx, const char *msg, ...)
{
    va_list ap;
    va_start(ap, msg);
    vcompile_error(ctx, msg, ap);
    va_end(ap);
}

bool GMQCC_WARN vcompile_warning(lex_ctx_t ctx, int warntype, const char *fmt, va_list ap)
{
    const char *msgtype = "warning";
    int         lvl     = LVL_WARNING;
    char        warn_name[1024];

    if (!OPTS_WARN(warntype))
        return false;

    warn_name[0] = '-';
    warn_name[1] = 'W';
    (void)util_strtononcmd(opts_warn_list[warntype].name, warn_name+2, sizeof(warn_name)-2);

    ++compile_warnings;
    if (OPTS_WERROR(warntype)) {
        if (!compile_Werrors)
            first_werror = ctx;
        ++compile_Werrors;
        msgtype = "Werror";
        if (OPTS_FLAG(BAIL_ON_WERROR)) {
            msgtype = "error";
            ++compile_errors;
        }
        lvl = LVL_ERROR;
    }

    con_vprintmsg_c(lvl, ctx.file, ctx.line, ctx.column, msgtype, fmt, ap, warn_name);

    return OPTS_WERROR(warntype) && OPTS_FLAG(BAIL_ON_WERROR);
}

bool GMQCC_WARN compile_warning(lex_ctx_t ctx, int warntype, const char *fmt, ...)
{
    bool r;
    va_list ap;
    va_start(ap, fmt);
    r = vcompile_warning(ctx, warntype, fmt, ap);
    va_end(ap);
    return r;
}