// Copyright (c) 2012, 2017 Peter Ohler. All rights reserved.
// Licensed under the MIT License. See LICENSE file in the project root for license details.

#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "dump.h"
#include "trace.h"

// Workaround in case INFINITY is not defined in math.h or if the OS is CentOS
#define OJ_INFINITY (1.0 / 0.0)

typedef unsigned long ulong;

static const char inf_val[]  = INF_VAL;
static const char ninf_val[] = NINF_VAL;
static const char nan_val[]  = NAN_VAL;

static void raise_strict(VALUE obj) {
    rb_raise(rb_eTypeError, "Failed to dump %s Object to JSON in strict mode.\n", rb_class2name(rb_obj_class(obj)));
}

// Removed dependencies on math due to problems with CentOS 5.4.
static void dump_float(VALUE obj, int depth, Out out, bool as_ok) {
    char   buf[64];
    char*  b;
    double d   = rb_num2dbl(obj);
    size_t cnt = 0;

    if (0.0 == d) {
        b    = buf;
        *b++ = '0';
        *b++ = '.';
        *b++ = '0';
        *b++ = '\0';
        cnt  = 3;
    } else {
        NanDump nd = out->opts->dump_opts.nan_dump;

        if (AutoNan == nd) {
            nd = RaiseNan;
        }
        if (OJ_INFINITY == d) {
            switch (nd) {
            case RaiseNan:
            case WordNan: raise_strict(obj); break;
            case NullNan:
                strcpy(buf, "null");
                cnt = 4;
                break;
            case HugeNan:
            default:
                strcpy(buf, inf_val);
                cnt = sizeof(inf_val) - 1;
                break;
            }
        } else if (-OJ_INFINITY == d) {
            switch (nd) {
            case RaiseNan:
            case WordNan: raise_strict(obj); break;
            case NullNan:
                strcpy(buf, "null");
                cnt = 4;
                break;
            case HugeNan:
            default:
                strcpy(buf, ninf_val);
                cnt = sizeof(ninf_val) - 1;
                break;
            }
        } else if (isnan(d)) {
            switch (nd) {
            case RaiseNan:
            case WordNan: raise_strict(obj); break;
            case NullNan:
                strcpy(buf, "null");
                cnt = 4;
                break;
            case HugeNan:
            default:
                strcpy(buf, nan_val);
                cnt = sizeof(nan_val) - 1;
                break;
            }
        } else if (d == (double)(long long int)d) {
            cnt = snprintf(buf, sizeof(buf), "%.1f", d);
        } else if (0 == out->opts->float_prec) {
            volatile VALUE rstr = oj_safe_string_convert(obj);

            cnt = RSTRING_LEN(rstr);
            if ((int)sizeof(buf) <= cnt) {
                cnt = sizeof(buf) - 1;
            }
            memcpy(buf, RSTRING_PTR(rstr), cnt);
            buf[cnt] = '\0';
        } else {
            cnt = oj_dump_float_printf(buf, sizeof(buf), obj, d, out->opts->float_fmt);
        }
    }
    assure_size(out, cnt);
    APPEND_CHARS(out->cur, buf, cnt);
    *out->cur = '\0';
}

static void dump_array(VALUE a, int depth, Out out, bool as_ok) {
    size_t size;
    size_t i;
    size_t cnt;
    int    d2 = depth + 1;

    if (Yes == out->opts->circular) {
        if (0 > oj_check_circular(a, out)) {
            oj_dump_nil(Qnil, 0, out, false);
            return;
        }
    }
    cnt         = RARRAY_LEN(a);
    *out->cur++ = '[';
    size        = 2;
    assure_size(out, size);
    if (0 == cnt) {
        *out->cur++ = ']';
    } else {
        if (out->opts->dump_opts.use) {
            size = d2 * out->opts->dump_opts.indent_size + out->opts->dump_opts.array_size + 1;
        } else {
            size = d2 * out->indent + 2;
        }
        assure_size(out, size * cnt);
        cnt--;
        for (i = 0; i <= cnt; i++) {
            if (out->opts->dump_opts.use) {
                if (0 < out->opts->dump_opts.array_size) {
                    APPEND_CHARS(out->cur, out->opts->dump_opts.array_nl, out->opts->dump_opts.array_size);
                }
                if (0 < out->opts->dump_opts.indent_size) {
                    int i;
                    for (i = d2; 0 < i; i--) {
                        APPEND_CHARS(out->cur, out->opts->dump_opts.indent_str, out->opts->dump_opts.indent_size);
                    }
                }
            } else {
                fill_indent(out, d2);
            }
            if (NullMode == out->opts->mode) {
                oj_dump_null_val(RARRAY_AREF(a, i), d2, out);
            } else {
                oj_dump_strict_val(RARRAY_AREF(a, i), d2, out);
            }
            if (i < cnt) {
                *out->cur++ = ',';
            }
        }
        size = depth * out->indent + 1;
        assure_size(out, size);
        if (out->opts->dump_opts.use) {
            // printf("*** d2: %u  indent: %u '%s'\n", d2, out->opts->dump_opts->indent_size,
            // out->opts->dump_opts->indent);
            if (0 < out->opts->dump_opts.array_size) {
                APPEND_CHARS(out->cur, out->opts->dump_opts.array_nl, out->opts->dump_opts.array_size);
            }
            if (0 < out->opts->dump_opts.indent_size) {
                int i;

                for (i = depth; 0 < i; i--) {
                    APPEND_CHARS(out->cur, out->opts->dump_opts.indent_str, out->opts->dump_opts.indent_size);
                }
            }
        } else {
            fill_indent(out, depth);
        }
        *out->cur++ = ']';
    }
    *out->cur = '\0';
}

static int hash_cb(VALUE key, VALUE value, VALUE ov) {
    Out  out   = (Out)ov;
    int  depth = out->depth;
    long size;
    int  rtype = rb_type(key);

    if (rtype != T_STRING && rtype != T_SYMBOL) {
        rb_raise(rb_eTypeError,
                 "In :strict and :null mode all Hash keys must be Strings or Symbols, not %s.\n",
                 rb_class2name(rb_obj_class(key)));
    }
    if (out->omit_nil && Qnil == value) {
        return ST_CONTINUE;
    }
    if (NULL != out->opts->dump_opts.only || NULL != out->opts->dump_opts.except) {
        if (oj_key_skip(key, out->opts->dump_opts.only, out->opts->dump_opts.except)) {
            return ST_CONTINUE;
        }
    }
    if (!out->opts->dump_opts.use) {
        size = depth * out->indent + 1;
        assure_size(out, size);
        fill_indent(out, depth);
        switch (rtype) {
        case T_STRING: oj_dump_str(key, 0, out, false); break;
        case T_SYMBOL: oj_dump_sym(key, 0, out, false); break;
        default: oj_dump_str(oj_safe_string_convert(key), 0, out, false); break;
        }
        *out->cur++ = ':';
    } else {
        size = depth * out->opts->dump_opts.indent_size + out->opts->dump_opts.hash_size + 1;
        assure_size(out, size);
        if (0 < out->opts->dump_opts.hash_size) {
            APPEND_CHARS(out->cur, out->opts->dump_opts.hash_nl, out->opts->dump_opts.hash_size);
        }
        if (0 < out->opts->dump_opts.indent_size) {
            int i;
            for (i = depth; 0 < i; i--) {
                APPEND_CHARS(out->cur, out->opts->dump_opts.indent_str, out->opts->dump_opts.indent_size);
            }
        }
        switch (rtype) {
        case T_STRING: oj_dump_str(key, 0, out, false); break;
        case T_SYMBOL: oj_dump_sym(key, 0, out, false); break;
        default: oj_dump_str(oj_safe_string_convert(key), 0, out, false); break;
        }
        size = out->opts->dump_opts.before_size + out->opts->dump_opts.after_size + 2;
        assure_size(out, size);
        if (0 < out->opts->dump_opts.before_size) {
            APPEND_CHARS(out->cur, out->opts->dump_opts.before_sep, out->opts->dump_opts.before_size);
        }
        *out->cur++ = ':';
        if (0 < out->opts->dump_opts.after_size) {
            APPEND_CHARS(out->cur, out->opts->dump_opts.after_sep, out->opts->dump_opts.after_size);
        }
    }
    if (NullMode == out->opts->mode) {
        oj_dump_null_val(value, depth, out);
    } else {
        oj_dump_strict_val(value, depth, out);
    }
    out->depth  = depth;
    *out->cur++ = ',';

    return ST_CONTINUE;
}

static void dump_hash(VALUE obj, int depth, Out out, bool as_ok) {
    int    cnt;
    size_t size;

    if (Yes == out->opts->circular) {
        if (0 > oj_check_circular(obj, out)) {
            oj_dump_nil(Qnil, 0, out, false);
            return;
        }
    }
    cnt  = (int)RHASH_SIZE(obj);
    size = depth * out->indent + 2;
    assure_size(out, 2);
    *out->cur++ = '{';
    if (0 == cnt) {
        *out->cur++ = '}';
    } else {
        out->depth = depth + 1;
        rb_hash_foreach(obj, hash_cb, (VALUE)out);
        if (',' == *(out->cur - 1)) {
            out->cur--;  // backup to overwrite last comma
        }
        if (!out->opts->dump_opts.use) {
            assure_size(out, size);
            fill_indent(out, depth);
        } else {
            size = depth * out->opts->dump_opts.indent_size + out->opts->dump_opts.hash_size + 1;
            assure_size(out, size);
            if (0 < out->opts->dump_opts.hash_size) {
                APPEND_CHARS(out->cur, out->opts->dump_opts.hash_nl, out->opts->dump_opts.hash_size);
            }
            if (0 < out->opts->dump_opts.indent_size) {
                int i;

                for (i = depth; 0 < i; i--) {
                    APPEND_CHARS(out->cur, out->opts->dump_opts.indent_str, out->opts->dump_opts.indent_size);
                }
            }
        }
        *out->cur++ = '}';
    }
    *out->cur = '\0';
}

static void dump_data_strict(VALUE obj, int depth, Out out, bool as_ok) {
    VALUE clas = rb_obj_class(obj);

    if (oj_bigdecimal_class == clas) {
        volatile VALUE rstr = oj_safe_string_convert(obj);

        oj_dump_raw(RSTRING_PTR(rstr), RSTRING_LEN(rstr), out);
    } else {
        raise_strict(obj);
    }
}

static void dump_data_null(VALUE obj, int depth, Out out, bool as_ok) {
    VALUE clas = rb_obj_class(obj);

    if (oj_bigdecimal_class == clas) {
        volatile VALUE rstr = oj_safe_string_convert(obj);

        oj_dump_raw(RSTRING_PTR(rstr), RSTRING_LEN(rstr), out);
    } else {
        oj_dump_nil(Qnil, depth, out, false);
    }
}

static DumpFunc strict_funcs[] = {
    NULL,              // RUBY_T_NONE   = 0x00,
    dump_data_strict,  // RUBY_T_OBJECT = 0x01,
    NULL,              // RUBY_T_CLASS  = 0x02,
    NULL,              // RUBY_T_MODULE = 0x03,
    dump_float,        // RUBY_T_FLOAT  = 0x04,
    oj_dump_str,       // RUBY_T_STRING = 0x05,
    NULL,              // RUBY_T_REGEXP = 0x06,
    dump_array,        // RUBY_T_ARRAY  = 0x07,
    dump_hash,         // RUBY_T_HASH   = 0x08,
    NULL,              // RUBY_T_STRUCT = 0x09,
    oj_dump_bignum,    // RUBY_T_BIGNUM = 0x0a,
    NULL,              // RUBY_T_FILE   = 0x0b,
    dump_data_strict,  // RUBY_T_DATA   = 0x0c,
    NULL,              // RUBY_T_MATCH  = 0x0d,
    NULL,              // RUBY_T_COMPLEX  = 0x0e,
    NULL,              // RUBY_T_RATIONAL = 0x0f,
    NULL,              // 0x10
    oj_dump_nil,       // RUBY_T_NIL    = 0x11,
    oj_dump_true,      // RUBY_T_TRUE   = 0x12,
    oj_dump_false,     // RUBY_T_FALSE  = 0x13,
    oj_dump_sym,       // RUBY_T_SYMBOL = 0x14,
    oj_dump_fixnum,    // RUBY_T_FIXNUM = 0x15,
};

void oj_dump_strict_val(VALUE obj, int depth, Out out) {
    int type = rb_type(obj);

    TRACE(out->opts->trace, "dump", obj, depth, TraceIn);
    if (MAX_DEPTH < depth) {
        rb_raise(rb_eNoMemError, "Too deeply nested.\n");
    }
    if (0 < type && type <= RUBY_T_FIXNUM) {
        DumpFunc f = strict_funcs[type];

        if (NULL != f) {
            f(obj, depth, out, false);
            TRACE(out->opts->trace, "dump", obj, depth, TraceOut);
            return;
        }
    }
    raise_strict(obj);
}

static DumpFunc null_funcs[] = {
    NULL,            // RUBY_T_NONE   = 0x00,
    dump_data_null,  // RUBY_T_OBJECT = 0x01,
    NULL,            // RUBY_T_CLASS  = 0x02,
    NULL,            // RUBY_T_MODULE = 0x03,
    dump_float,      // RUBY_T_FLOAT  = 0x04,
    oj_dump_str,     // RUBY_T_STRING = 0x05,
    NULL,            // RUBY_T_REGEXP = 0x06,
    dump_array,      // RUBY_T_ARRAY  = 0x07,
    dump_hash,       // RUBY_T_HASH   = 0x08,
    NULL,            // RUBY_T_STRUCT = 0x09,
    oj_dump_bignum,  // RUBY_T_BIGNUM = 0x0a,
    NULL,            // RUBY_T_FILE   = 0x0b,
    dump_data_null,  // RUBY_T_DATA   = 0x0c,
    NULL,            // RUBY_T_MATCH  = 0x0d,
    NULL,            // RUBY_T_COMPLEX  = 0x0e,
    NULL,            // RUBY_T_RATIONAL = 0x0f,
    NULL,            // 0x10
    oj_dump_nil,     // RUBY_T_NIL    = 0x11,
    oj_dump_true,    // RUBY_T_TRUE   = 0x12,
    oj_dump_false,   // RUBY_T_FALSE  = 0x13,
    oj_dump_sym,     // RUBY_T_SYMBOL = 0x14,
    oj_dump_fixnum,  // RUBY_T_FIXNUM = 0x15,
};

void oj_dump_null_val(VALUE obj, int depth, Out out) {
    int type = rb_type(obj);

    TRACE(out->opts->trace, "dump", obj, depth, TraceOut);
    if (MAX_DEPTH < depth) {
        rb_raise(rb_eNoMemError, "Too deeply nested.\n");
    }
    if (0 < type && type <= RUBY_T_FIXNUM) {
        DumpFunc f = null_funcs[type];

        if (NULL != f) {
            f(obj, depth, out, false);
            TRACE(out->opts->trace, "dump", obj, depth, TraceOut);
            return;
        }
    }
    oj_dump_nil(Qnil, depth, out, false);
    TRACE(out->opts->trace, "dump", Qnil, depth, TraceOut);
}
