#include "test-tool.h"
#include "cache.h"
#include "json-writer.h"

static const char *expect_obj1 = "{\"a\":\"abc\",\"b\":42,\"c\":true}";
static const char *expect_obj2 = "{\"a\":-1,\"b\":2147483647,\"c\":0}";
static const char *expect_obj3 = "{\"a\":0,\"b\":4294967295,\"c\":9223372036854775807}";
static const char *expect_obj4 = "{\"t\":true,\"f\":false,\"n\":null}";
static const char *expect_obj5 = "{\"abc\\tdef\":\"abc\\\\def\"}";
static const char *expect_obj6 = "{\"a\":3.14}";

static const char *pretty_obj1 = ("{\n"
                                  "  \"a\": \"abc\",\n"
                                  "  \"b\": 42,\n"
                                  "  \"c\": true\n"
                                  "}");
static const char *pretty_obj2 = ("{\n"
                                  "  \"a\": -1,\n"
                                  "  \"b\": 2147483647,\n"
                                  "  \"c\": 0\n"
                                  "}");
static const char *pretty_obj3 = ("{\n"
                                  "  \"a\": 0,\n"
                                  "  \"b\": 4294967295,\n"
                                  "  \"c\": 9223372036854775807\n"
                                  "}");
static const char *pretty_obj4 = ("{\n"
                                  "  \"t\": true,\n"
                                  "  \"f\": false,\n"
                                  "  \"n\": null\n"
                                  "}");

static struct json_writer obj1 = JSON_WRITER_INIT;
static struct json_writer obj2 = JSON_WRITER_INIT;
static struct json_writer obj3 = JSON_WRITER_INIT;
static struct json_writer obj4 = JSON_WRITER_INIT;
static struct json_writer obj5 = JSON_WRITER_INIT;
static struct json_writer obj6 = JSON_WRITER_INIT;

static void make_obj1(int pretty)
{
        jw_object_begin(&obj1, pretty);
        {
                jw_object_string(&obj1, "a", "abc");
                jw_object_intmax(&obj1, "b", 42);
                jw_object_true(&obj1, "c");
        }
        jw_end(&obj1);
}

static void make_obj2(int pretty)
{
        jw_object_begin(&obj2, pretty);
        {
                jw_object_intmax(&obj2, "a", -1);
                jw_object_intmax(&obj2, "b", 0x7fffffff);
                jw_object_intmax(&obj2, "c", 0);
        }
        jw_end(&obj2);
}

static void make_obj3(int pretty)
{
        jw_object_begin(&obj3, pretty);
        {
                jw_object_intmax(&obj3, "a", 0);
                jw_object_intmax(&obj3, "b", 0xffffffff);
                jw_object_intmax(&obj3, "c", 0x7fffffffffffffffULL);
        }
        jw_end(&obj3);
}

static void make_obj4(int pretty)
{
        jw_object_begin(&obj4, pretty);
        {
                jw_object_true(&obj4, "t");
                jw_object_false(&obj4, "f");
                jw_object_null(&obj4, "n");
        }
        jw_end(&obj4);
}

static void make_obj5(int pretty)
{
        jw_object_begin(&obj5, pretty);
        {
                jw_object_string(&obj5, "abc" "\x09" "def", "abc" "\\" "def");
        }
        jw_end(&obj5);
}

static void make_obj6(int pretty)
{
        jw_object_begin(&obj6, pretty);
        {
                jw_object_double(&obj6, "a", 2, 3.14159);
        }
        jw_end(&obj6);
}

static const char *expect_arr1 = "[\"abc\",42,true]";
static const char *expect_arr2 = "[-1,2147483647,0]";
static const char *expect_arr3 = "[0,4294967295,9223372036854775807]";
static const char *expect_arr4 = "[true,false,null]";

static const char *pretty_arr1 = ("[\n"
                                  "  \"abc\",\n"
                                  "  42,\n"
                                  "  true\n"
                                  "]");
static const char *pretty_arr2 = ("[\n"
                                  "  -1,\n"
                                  "  2147483647,\n"
                                  "  0\n"
                                  "]");
static const char *pretty_arr3 = ("[\n"
                                  "  0,\n"
                                  "  4294967295,\n"
                                  "  9223372036854775807\n"
                                  "]");
static const char *pretty_arr4 = ("[\n"
                                  "  true,\n"
                                  "  false,\n"
                                  "  null\n"
                                  "]");

static struct json_writer arr1 = JSON_WRITER_INIT;
static struct json_writer arr2 = JSON_WRITER_INIT;
static struct json_writer arr3 = JSON_WRITER_INIT;
static struct json_writer arr4 = JSON_WRITER_INIT;

static void make_arr1(int pretty)
{
        jw_array_begin(&arr1, pretty);
        {
                jw_array_string(&arr1, "abc");
                jw_array_intmax(&arr1, 42);
                jw_array_true(&arr1);
        }
        jw_end(&arr1);
}

static void make_arr2(int pretty)
{
        jw_array_begin(&arr2, pretty);
        {
                jw_array_intmax(&arr2, -1);
                jw_array_intmax(&arr2, 0x7fffffff);
                jw_array_intmax(&arr2, 0);
        }
        jw_end(&arr2);
}

static void make_arr3(int pretty)
{
        jw_array_begin(&arr3, pretty);
        {
                jw_array_intmax(&arr3, 0);
                jw_array_intmax(&arr3, 0xffffffff);
                jw_array_intmax(&arr3, 0x7fffffffffffffffULL);
        }
        jw_end(&arr3);
}

static void make_arr4(int pretty)
{
        jw_array_begin(&arr4, pretty);
        {
                jw_array_true(&arr4);
                jw_array_false(&arr4);
                jw_array_null(&arr4);
        }
        jw_end(&arr4);
}

static char *expect_nest1 =
        "{\"obj1\":{\"a\":\"abc\",\"b\":42,\"c\":true},\"arr1\":[\"abc\",42,true]}";

static struct json_writer nest1 = JSON_WRITER_INIT;

static void make_nest1(int pretty)
{
        jw_object_begin(&nest1, pretty);
        {
                jw_object_sub_jw(&nest1, "obj1", &obj1);
                jw_object_sub_jw(&nest1, "arr1", &arr1);
        }
        jw_end(&nest1);
}

static char *expect_inline1 =
        "{\"obj1\":{\"a\":\"abc\",\"b\":42,\"c\":true},\"arr1\":[\"abc\",42,true]}";

static char *pretty_inline1 =
        ("{\n"
         "  \"obj1\": {\n"
         "    \"a\": \"abc\",\n"
         "    \"b\": 42,\n"
         "    \"c\": true\n"
         "  },\n"
         "  \"arr1\": [\n"
         "    \"abc\",\n"
         "    42,\n"
         "    true\n"
         "  ]\n"
         "}");

static struct json_writer inline1 = JSON_WRITER_INIT;

static void make_inline1(int pretty)
{
        jw_object_begin(&inline1, pretty);
        {
                jw_object_inline_begin_object(&inline1, "obj1");
                {
                        jw_object_string(&inline1, "a", "abc");
                        jw_object_intmax(&inline1, "b", 42);
                        jw_object_true(&inline1, "c");
                }
                jw_end(&inline1);
                jw_object_inline_begin_array(&inline1, "arr1");
                {
                        jw_array_string(&inline1, "abc");
                        jw_array_intmax(&inline1, 42);
                        jw_array_true(&inline1);
                }
                jw_end(&inline1);
        }
        jw_end(&inline1);
}

static char *expect_inline2 =
        "[[1,2],[3,4],{\"a\":\"abc\"}]";

static char *pretty_inline2 =
        ("[\n"
         "  [\n"
         "    1,\n"
         "    2\n"
         "  ],\n"
         "  [\n"
         "    3,\n"
         "    4\n"
         "  ],\n"
         "  {\n"
         "    \"a\": \"abc\"\n"
         "  }\n"
         "]");

static struct json_writer inline2 = JSON_WRITER_INIT;

static void make_inline2(int pretty)
{
        jw_array_begin(&inline2, pretty);
        {
                jw_array_inline_begin_array(&inline2);
                {
                        jw_array_intmax(&inline2, 1);
                        jw_array_intmax(&inline2, 2);
                }
                jw_end(&inline2);
                jw_array_inline_begin_array(&inline2);
                {
                        jw_array_intmax(&inline2, 3);
                        jw_array_intmax(&inline2, 4);
                }
                jw_end(&inline2);
                jw_array_inline_begin_object(&inline2);
                {
                        jw_object_string(&inline2, "a", "abc");
                }
                jw_end(&inline2);
        }
        jw_end(&inline2);
}

/*
 * When super is compact, we expect subs to be compacted (even if originally
 * pretty).
 */
static const char *expect_mixed1 =
        ("{\"obj1\":{\"a\":\"abc\",\"b\":42,\"c\":true},"
         "\"arr1\":[\"abc\",42,true]}");

/*
 * When super is pretty, a compact sub (obj1) is kept compact and a pretty
 * sub (arr1) is re-indented.
 */
static const char *pretty_mixed1 =
        ("{\n"
         "  \"obj1\": {\"a\":\"abc\",\"b\":42,\"c\":true},\n"
         "  \"arr1\": [\n"
         "    \"abc\",\n"
         "    42,\n"
         "    true\n"
         "  ]\n"
         "}");

static struct json_writer mixed1 = JSON_WRITER_INIT;

static void make_mixed1(int pretty)
{
        jw_init(&obj1);
        jw_init(&arr1);

        make_obj1(0); /* obj1 is compact */
        make_arr1(1); /* arr1 is pretty */

        jw_object_begin(&mixed1, pretty);
        {
                jw_object_sub_jw(&mixed1, "obj1", &obj1);
                jw_object_sub_jw(&mixed1, "arr1", &arr1);
        }
        jw_end(&mixed1);
}

static void cmp(const char *test, const struct json_writer *jw, const char *exp)
{
        if (!strcmp(jw->json.buf, exp))
                return;

        printf("error[%s]: observed '%s' expected '%s'\n",
               test, jw->json.buf, exp);
        exit(1);
}

#define t(v) do { make_##v(0); cmp(#v, &v, expect_##v); } while (0)
#define p(v) do { make_##v(1); cmp(#v, &v, pretty_##v); } while (0)

/*
 * Run some basic regression tests with some known patterns.
 * These tests also demonstrate how to use the jw_ API.
 */
static int unit_tests(void)
{
        /* comptact (canonical) forms */
        t(obj1);
        t(obj2);
        t(obj3);
        t(obj4);
        t(obj5);
        t(obj6);

        t(arr1);
        t(arr2);
        t(arr3);
        t(arr4);

        t(nest1);

        t(inline1);
        t(inline2);

        jw_init(&obj1);
        jw_init(&obj2);
        jw_init(&obj3);
        jw_init(&obj4);

        jw_init(&arr1);
        jw_init(&arr2);
        jw_init(&arr3);
        jw_init(&arr4);

        jw_init(&inline1);
        jw_init(&inline2);

        /* pretty forms */
        p(obj1);
        p(obj2);
        p(obj3);
        p(obj4);

        p(arr1);
        p(arr2);
        p(arr3);
        p(arr4);

        p(inline1);
        p(inline2);

        /* mixed forms */
        t(mixed1);
        jw_init(&mixed1);
        p(mixed1);

        return 0;
}

static void get_s(int line_nr, char **s_in)
{
        *s_in = strtok(NULL, " ");
        if (!*s_in)
                die("line[%d]: expected: <s>", line_nr);
}

static void get_i(int line_nr, intmax_t *s_in)
{
        char *s;
        char *endptr;

        get_s(line_nr, &s);

        *s_in = strtol(s, &endptr, 10);
        if (*endptr || errno == ERANGE)
                die("line[%d]: invalid integer value", line_nr);
}

static void get_d(int line_nr, double *s_in)
{
        char *s;
        char *endptr;

        get_s(line_nr, &s);

        *s_in = strtod(s, &endptr);
        if (*endptr || errno == ERANGE)
                die("line[%d]: invalid float value", line_nr);
}

static int pretty;

#define MAX_LINE_LENGTH (64 * 1024)

static char *get_trimmed_line(char *buf, int buf_size)
{
        int len;

        if (!fgets(buf, buf_size, stdin))
                return NULL;

        len = strlen(buf);
        while (len > 0) {
                char c = buf[len - 1];
                if (c == '\n' || c == '\r' || c == ' ' || c == '\t')
                        buf[--len] = 0;
                else
                        break;
        }

        while (*buf == ' ' || *buf == '\t')
                buf++;

        return buf;
}

static int scripted(void)
{
        struct json_writer jw = JSON_WRITER_INIT;
        char buf[MAX_LINE_LENGTH];
        char *line;
        int line_nr = 0;

        line = get_trimmed_line(buf, MAX_LINE_LENGTH);
        if (!line)
                return 0;

        if (!strcmp(line, "object"))
                jw_object_begin(&jw, pretty);
        else if (!strcmp(line, "array"))
                jw_array_begin(&jw, pretty);
        else
                die("expected first line to be 'object' or 'array'");

        while ((line = get_trimmed_line(buf, MAX_LINE_LENGTH)) != NULL) {
                char *verb;
                char *key;
                char *s_value;
                intmax_t i_value;
                double d_value;

                line_nr++;

                verb = strtok(line, " ");

                if (!strcmp(verb, "end")) {
                        jw_end(&jw);
                }
                else if (!strcmp(verb, "object-string")) {
                        get_s(line_nr, &key);
                        get_s(line_nr, &s_value);
                        jw_object_string(&jw, key, s_value);
                }
                else if (!strcmp(verb, "object-int")) {
                        get_s(line_nr, &key);
                        get_i(line_nr, &i_value);
                        jw_object_intmax(&jw, key, i_value);
                }
                else if (!strcmp(verb, "object-double")) {
                        get_s(line_nr, &key);
                        get_i(line_nr, &i_value);
                        get_d(line_nr, &d_value);
                        jw_object_double(&jw, key, i_value, d_value);
                }
                else if (!strcmp(verb, "object-true")) {
                        get_s(line_nr, &key);
                        jw_object_true(&jw, key);
                }
                else if (!strcmp(verb, "object-false")) {
                        get_s(line_nr, &key);
                        jw_object_false(&jw, key);
                }
                else if (!strcmp(verb, "object-null")) {
                        get_s(line_nr, &key);
                        jw_object_null(&jw, key);
                }
                else if (!strcmp(verb, "object-object")) {
                        get_s(line_nr, &key);
                        jw_object_inline_begin_object(&jw, key);
                }
                else if (!strcmp(verb, "object-array")) {
                        get_s(line_nr, &key);
                        jw_object_inline_begin_array(&jw, key);
                }
                else if (!strcmp(verb, "array-string")) {
                        get_s(line_nr, &s_value);
                        jw_array_string(&jw, s_value);
                }
                else if (!strcmp(verb, "array-int")) {
                        get_i(line_nr, &i_value);
                        jw_array_intmax(&jw, i_value);
                }
                else if (!strcmp(verb, "array-double")) {
                        get_i(line_nr, &i_value);
                        get_d(line_nr, &d_value);
                        jw_array_double(&jw, i_value, d_value);
                }
                else if (!strcmp(verb, "array-true"))
                        jw_array_true(&jw);
                else if (!strcmp(verb, "array-false"))
                        jw_array_false(&jw);
                else if (!strcmp(verb, "array-null"))
                        jw_array_null(&jw);
                else if (!strcmp(verb, "array-object"))
                        jw_array_inline_begin_object(&jw);
                else if (!strcmp(verb, "array-array"))
                        jw_array_inline_begin_array(&jw);
                else
                        die("unrecognized token: '%s'", verb);
        }

        if (!jw_is_terminated(&jw))
                die("json not terminated: '%s'", jw.json.buf);

        printf("%s\n", jw.json.buf);

        strbuf_release(&jw.json);
        return 0;
}

int cmd__json_writer(int argc, const char **argv)
{
        argc--; /* skip over "json-writer" arg */
        argv++;

        if (argc > 0 && argv[0][0] == '-') {
                if (!strcmp(argv[0], "-u") || !strcmp(argv[0], "--unit"))
                        return unit_tests();

                if (!strcmp(argv[0], "-p") || !strcmp(argv[0], "--pretty"))
                        pretty = 1;
        }

        return scripted();
}