#include "ccm.h"
#include "str.h"

void ccm_init(ccm_t* self)
{
    assert(self);
    sym_init(&self->sym);
    vec_init(&self->values);
    vec_init(&self->stack);
    vec_init(&self->globals);
    err_init(&self->err);
    self->id_counter = 0;

    sym_open_scope(&self->sym);
}

void ccm_entry_free(ccm_entry_t* self)
{
    value_free(self->value);
    free(self->value);
}

void ccm_free(ccm_t* self)
{
    assert(self);
    sym_free(&self->sym);
    err_free(&self->err);
    vec_free_elements(&self->values, (void*) ccm_entry_free);
    vec_free(&self->values);
    vec_free(&self->stack);
    vec_free(&self->globals);
}

size_t ccm_str(ccm_t* self, char* buffer, size_t size)
{
    assert(self);
    assert(buffer);

    size_t sz = 0;

    for (size_t i=0; i<self->stack.size; i++)
    {
        if (sz >= size)
        {
            break;
        }

        value_t* val = ccm_to_value(self, (CCM) self->stack.data[i]);
        sz += value_str(val, buffer + sz, size - sz);
        sz += snprintf(buffer + sz, size - sz, "\n");
    }

    return sz;
}

value_t* ccm_find_value(ccm_t* self, size_t addr)
{
    for (size_t i=0; i<self->values.size; i++)
    {
        if (((ccm_entry_t*) self->values.data[i])->id == (int) addr)
        {
            return ((ccm_entry_t*)self->values.data[i])->value;
        }
    }
    assert(0);
}

size_t ccm_add_value(ccm_t* self, value_t* value)
{
    assert(self);
    assert(value);

    ccm_entry_t* entry = malloc(sizeof(ccm_entry_t));
    entry->value = value;
    entry->id = self->id_counter;
    self->id_counter++;

    vec_push(&self->values, entry);
    return self->id_counter - 1;
}

size_t ccm_store_global(ccm_t* self, CCM value)
{
    assert(self);

    vec_push(&self->globals, (void*) value);
    return self->globals.size - 1;
}

CCM ccm_load_global(ccm_t* self, size_t addr)
{
    assert(self);
    assert(addr < self->globals.size);

    return (CCM) self->globals.data[addr];
}

CCM ccm_from_value(ccm_t* self, value_t* value)
{
    assert(self);
    assert(value);

    switch (value->type)
    {
        case TYPE_NUM: {
            return ccm_to_num(self, value->data.num, value->line);
        } break;

        case TYPE_STR: {
            return ccm_to_str(self, value->data.str, value->line);
        } break;

        case TYPE_BOOLEAN: {
            return ccm_to_boolean(
                self,
                value->data.boolean,
                value->line
            );
        } break;

        case TYPE_ARRAY: {
            vec_t * vec = malloc(sizeof(vec_t));
            vec_init(vec);
            for (size_t i=0; i<value->data.array->size; i++)
            {
                vec_push(vec,
                    value->data.array->data[i]
                );
            }

            return ccm_to_array(
                self,
                vec,
                value->line
            );
        } break;
        case TYPE_TUPLE: {
            vec_t * vec = malloc(sizeof(vec_t));
            vec_init(vec);
            for (size_t i=0; i<value->data.tuple->size; i++)
            {
                vec_push(vec, value_new_clone(
                    value->data.tuple->data[i]
                ));
            }

            return ccm_to_tuple(
                self,
                vec,
                value->line
            );
        } break;

        default: {
            fprintf(stderr,
                    "cannot convert value of type <%s> to CCM\n",
                    TypeStr[value->type]);
            abort();
        } break;
    }
}

value_t* ccm_to_value(ccm_t* self, CCM value)
{
    assert(self);
    value_t* val = ccm_find_value(self, value);

    if (val->type == TYPE_REF)
    {
        CCM addr = (CCM) self->globals.data[val->data.ref];
        return ccm_to_value(self, addr);
    }
    return val;
}

int ccm_is_num(ccm_t* self, CCM value)
{
    value_t const* val = ccm_find_value(self, value);
    return val->type == TYPE_NUM;
}

double ccm_from_num(ccm_t* self, CCM value)
{
    assert(self);
    assert(value < self->values.size);

    value_t* val = ccm_find_value(self, value);

    if (!ccm_is_num(self, value))
    {
        err_push(&self->err, val->line, "not a num");
        return 0.0;
    }

    return val->data.num;
}

CCM ccm_to_num(ccm_t* self, double value, int line)
{
    assert(self);
    value_t* val = malloc(sizeof(value_t));
    value_init_num(val, value, line);

    return ccm_add_value(self, val);
}

int ccm_is_tuple(ccm_t* self, CCM value)
{
    assert(self);
    value_t* val = ccm_find_value(self, value);
    assert(val);
    return val->type == TYPE_TUPLE;
}

vec_t* ccm_from_tuple(ccm_t* self, CCM value)
{
    assert(self);
    value_t* val = ccm_find_value(self, value);

    if (!ccm_is_tuple(self, value))
    {
        err_push(&self->err, val->line, "not a tuple");
        return NULL;
    }
    return val->data.tuple;
}

CCM ccm_to_tuple(ccm_t* self, vec_t* values, int line)
{
    assert(self);
    assert(values);
    value_t* value = malloc(sizeof(value_t));
    value_init_new_tuple(value, values, line);

    return ccm_add_value(self, value);
}

int ccm_is_boolean(ccm_t* self, CCM value)
{
    assert(self);
    return ccm_find_value(self, value)->type == TYPE_BOOLEAN;
}

int ccm_from_boolean(ccm_t* self, CCM value)
{
    assert(self);
    return ccm_find_value(self, value)->data.boolean;
}

CCM ccm_to_boolean(ccm_t* self, int value, int line)
{
    value_t* boolean = malloc(sizeof(value_t));
    value_init_boolean(boolean, value, line);
    return ccm_add_value(self, boolean);
}

int ccm_is_str(ccm_t* self, CCM value)
{
    assert(self);
    return ccm_find_value(self, value)->type == TYPE_STR;
}

char* ccm_from_str(ccm_t* self, CCM value)
{
    assert(self);
    return ccm_find_value(self, value)->data.str;
}

CCM ccm_to_str(ccm_t* self, char const* value, int line)
{
    assert(self);

    value_t* val = malloc(sizeof(value_t));
    value_init_str(val, value, line);

    return ccm_add_value(self, val);
}

int ccm_is_array(ccm_t* self, CCM value)
{
    assert(self);
    value_t const* val = ccm_find_value(self, value);
    return val->type == TYPE_ARRAY;
}

vec_t* ccm_from_array(ccm_t* self, CCM value)
{
    assert(self);
    value_t* val = ccm_find_value(self, value);
    return val->data.array;
}

CCM ccm_to_array(ccm_t* self, vec_t* value, int line)
{
    assert(self);
    value_t* val = malloc(sizeof(value_t));
    value_init_new_array(val, value, line);
    return ccm_add_value(self, val);
}

int ccm_is_ref(ccm_t* self, CCM value)
{
    assert(self);
    return ccm_find_value(self, value)->type == TYPE_REF;
}

size_t ccm_from_ref(ccm_t* self, CCM value)
{
    assert(self);
    return ccm_find_value(self, value)->data.ref;
}

CCM ccm_to_ref(ccm_t* self, size_t value, int line)
{
    assert(self);

    value_t* val = malloc(sizeof(value_t));
    value_init_ref(val, value, line);
    return ccm_add_value(self, val);
}

void ccm_push(ccm_t* self, CCM value)
{
    assert(self);
    vec_push(&self->stack, (void*) value);
}

CCM ccm_pop(ccm_t* self)
{
    assert(self);
    void* val = vec_pop(&self->stack);
    return (CCM) val;
}

CCM ccm_top(ccm_t* self, int depth)
{
    assert(self);
    assert((size_t) depth < self->stack.size);

    return (CCM) self->stack.data[self->stack.size - 1 - depth];
}

void ccm_set(ccm_t* self, CCM value, int addr)
{
    assert(self);
    while (addr >= (ssize_t) self->stack.size)
    {
        ccm_push(self, 0);
    }

    self->stack.data[addr] = (void*) value;
}

CCM ccm_get(ccm_t* self, int addr)
{
    assert(self);
    assert(addr < (ssize_t) self->stack.size);
    assert(addr >= 0);

    return (CCM) self->stack.data[addr];
}

void ccm_in(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);

    int line = ccm_find_value(self, ccm_lhs)->line;

    if (ccm_is_ref(self, ccm_rhs)) {
        value_t* rhs_val = ccm_to_value(self, ccm_rhs);
        value_t* val = ccm_to_value(self, ccm_lhs);
        assert(rhs_val->type == TYPE_ARRAY);
        vec_t* rhs = rhs_val->data.array;

        for (size_t i=0; i<rhs->size; i++)
        {
            if (value_equals(val, rhs->data[i]))
            {
                ccm_push(self, ccm_to_boolean(self, 1, line));
                return;
            }
        }

        ccm_push(self, ccm_to_boolean(self, 0, line));
        return;
    }
    if (ccm_is_tuple(self, ccm_rhs)) {
        vec_t* rhs = ccm_from_tuple(self, ccm_rhs);
        value_t* val = ccm_find_value(self, ccm_lhs);

        for (size_t i=0; i<rhs->size; i++)
        {
            if (value_equals(val, rhs->data[i]))
            {
                ccm_push(self, ccm_to_boolean(self, 1, line));
                return;
            }
        }

        ccm_push(self, ccm_to_boolean(self, 0, line));
        return;
    }
    err_push(&self->err, line, "cannot test membership");
    return;
}

void ccm_add(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);
    int line = ccm_find_value(self, ccm_lhs)->line;

    if (ccm_is_ref(self, ccm_rhs)
        && ccm_is_ref(self, ccm_lhs))
    {
        value_t* lhs = ccm_to_value(self, ccm_lhs);
        value_t* rhs = ccm_to_value(self, ccm_rhs);

        vec_t* data = malloc(sizeof(vec_t));
        vec_init(data);

        for (size_t i=0; i<lhs->data.array->size; i++)
        {
            vec_push(data,
                     lhs->data.array->data[i]);
        }

        for (size_t i=0; i<rhs->data.array->size; i++)
        {
            vec_push(data,
                     rhs->data.array->data[i]);
        }

        value_t* res = malloc(sizeof(value_t));
        value_init_new_array(res, data, lhs->line);

        CCM res_id = ccm_store_global(
            self,
            ccm_add_value(self, res)
        );

        value_t* ref = malloc(sizeof(value_t));
        value_init_ref(ref, res_id, lhs->line);

        ccm_push(self, ccm_add_value(self, ref));

        return;
    }
    if (ccm_is_str(self, ccm_rhs)
        && ccm_is_str(self, ccm_lhs))
    {
        char const* lhs = ccm_from_str(self, ccm_lhs);
        char const* rhs = ccm_from_str(self, ccm_rhs);

        str_t s;
        str_init(&s);
        str_push_cstr(&s, lhs);
        str_push_cstr(&s, rhs);
        ccm_push(self, ccm_to_str(self, s.value, line));
        str_free(&s);
        return;
    }

    double rhs = ccm_from_num(self, ccm_rhs);
    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, lhs + rhs, line));
}

void ccm_sub(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);
    int line = ccm_find_value(self, ccm_lhs)->line;
    double rhs = ccm_from_num(self, ccm_rhs);
    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, lhs - rhs, line));
}

void ccm_usub(ccm_t* self)
{
    assert(self);
    CCM ccm_lhs = ccm_pop(self);
    int line = ccm_find_value(self, ccm_lhs)->line;

    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, -lhs, line));
}

void ccm_mul(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);

    int line = ccm_find_value(self, ccm_lhs)->line;

    if (ccm_is_ref(self, ccm_rhs)
    && ccm_is_num(self, ccm_lhs))
    {
        CCM tmp = ccm_lhs;
        ccm_lhs = ccm_rhs;
        ccm_rhs = tmp;
    }

    if (ccm_is_ref(self, ccm_lhs)
    && ccm_is_num(self, ccm_rhs))
    {
        int count = ccm_from_num(self, ccm_rhs);
        value_t* val = ccm_to_value(self, ccm_lhs);
        vec_t* vec = malloc(sizeof(vec_t));
        vec_init(vec);

        for (int i=0; i<count; i++)
        {
             for (size_t j=0; j<val->data.array->size; j++)
             {
                vec_push(
                    vec,
                    val->data.array->data[j]
                );
             }
        }

        value_t* result = malloc(sizeof(value_t));
        value_init_new_array(result, vec, val->line);

        int id = ccm_store_global(
            self,
            ccm_add_value(self, result)
        );
        CCM res = ccm_to_ref(self, id, val->line);
        ccm_push(self, res);

        return;
    }
    if (ccm_is_str(self, ccm_rhs)
    && ccm_is_num(self, ccm_lhs))
    {
        CCM tmp = ccm_lhs;
        ccm_lhs = ccm_rhs;
        ccm_rhs = tmp;
    }

    if (ccm_is_str(self, ccm_lhs)
    && ccm_is_num(self, ccm_rhs))
    {
        int count = ccm_from_num(self, ccm_rhs);
        char const* val = ccm_from_str(self, ccm_lhs);
        str_t s;
        str_init(&s);

        for (int i=0; i<count; i++)
        {
            str_push_cstr(&s, val);
        }

        ccm_push(self, ccm_to_str(self, s.value, line));
        str_free(&s);
        return;
    }

    double rhs = ccm_from_num(self, ccm_rhs);
    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, lhs * rhs, line));
}

void ccm_div(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);
    int line = ccm_find_value(self, ccm_lhs)->line;
    double rhs = ccm_from_num(self, ccm_rhs);
    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, lhs / rhs, line));
}

void ccm_mod(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);
    int line = ccm_find_value(self, ccm_lhs)->line;

    double rhs = ccm_from_num(self, ccm_rhs);
    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, fmod(lhs, rhs), line));
}

void ccm_pow(ccm_t* self)
{
    assert(self);
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);
    int line = ccm_find_value(self, ccm_lhs)->line;

    double rhs = ccm_from_num(self, ccm_rhs);
    double lhs = ccm_from_num(self, ccm_lhs);

    ccm_push(self, ccm_to_num(self, powf(lhs, rhs), line));
}

void ccm_not(ccm_t* self)
{
    assert(self);
    CCM ccm_lhs = ccm_pop(self);

    int line = ccm_find_value(self, ccm_lhs)->line;
    int lhs = ccm_from_boolean(self, ccm_lhs);

    ccm_push(self, ccm_to_boolean(self, !lhs, line));
}

void ccm_eq(ccm_t* self)
{
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);
    value_t* lhs = ccm_to_value(self, ccm_lhs);
    value_t* rhs = ccm_to_value(self, ccm_rhs);
    int line = ccm_find_value(self, ccm_lhs)->line;
    int eq = value_equals(lhs, rhs);
    ccm_push(self, ccm_to_boolean(self, eq, line));
}

void ccm_ne(ccm_t* self)
{
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);

    value_t* lhs = ccm_to_value(self, ccm_lhs);
    value_t* rhs = ccm_to_value(self, ccm_rhs);
    int line = ccm_find_value(self, ccm_lhs)->line;
    int eq = value_equals(lhs, rhs);
    ccm_push(self, ccm_to_boolean(self, !eq, line));
}

void ccm_lt(ccm_t* self)
{
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);

    double lhs = ccm_from_num(self, ccm_lhs);
    double rhs = ccm_from_num(self, ccm_rhs);

    int line = ccm_find_value(self, ccm_lhs)->line;
    ccm_push(self, ccm_to_boolean(self, lhs < rhs, line));
}

void ccm_le(ccm_t* self)
{
    ccm_gt(self);
    ccm_not(self);
}

void ccm_gt(ccm_t* self)
{
    CCM ccm_rhs = ccm_pop(self);
    CCM ccm_lhs = ccm_pop(self);

    double lhs = ccm_from_num(self, ccm_lhs);
    double rhs = ccm_from_num(self, ccm_rhs);
    int line = ccm_find_value(self, ccm_lhs)->line;
    ccm_push(self, ccm_to_boolean(self, lhs > rhs, line));
}

void ccm_ge(ccm_t* self)
{
    ccm_lt(self);
    ccm_not(self);
}