#include "meta.h"
#include "../coding/coding.h"


typedef struct {
    int total_subsongs;
    int target_subsong;

    uint32_t stream_offset;
    uint32_t stream_size;

    int loop_flag;
    int sample_rate;
    int channels;
    int32_t num_samples;
} adm3_header_t;

static int parse_adm3(adm3_header_t* adm3, STREAMFILE* sf);


/* ADM3 - Crankcase Audio REV plugin file [Cyberpunk 2077 (PC), MotoGP 21 (PC)] */
VGMSTREAM* init_vgmstream_adm3(STREAMFILE* sf) {
    VGMSTREAM* vgmstream = NULL;
    adm3_header_t adm3 = {0};


    /* checks */
    if (!is_id32be(0x00,sf, "ADM3"))
        goto fail;
    if (!check_extensions(sf, "wem"))
        goto fail;

    adm3.target_subsong = sf->stream_index;
    if (adm3.target_subsong == 0) adm3.target_subsong = 1;

    /* ADM3 are files used with the Wwise Crankaudio plugin, that simulate engine noises with
     * base internal samples and some internal RPM config (probably). Actual file seems to
     * define some combo of samples, this only plays those separate samples.
     * Decoder is basically Apple's IMA (internally just "ADPCMDecoder") but transforms to float
     * each sample during decode by multiplying by 0.000030518509 */

    if (!parse_adm3(&adm3, sf))
        goto fail;


    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(adm3.channels, adm3.loop_flag);
    if (!vgmstream) goto fail;

    vgmstream->meta_type = meta_ADM3;
    vgmstream->sample_rate = adm3.sample_rate;
    vgmstream->num_samples = adm3.num_samples; /* slightly lower than bytes-to-samples */
    vgmstream->num_streams = adm3.total_subsongs;
    vgmstream->stream_size = adm3.stream_size;

    vgmstream->coding_type = coding_APPLE_IMA4;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0x22;

    if (!vgmstream_open_stream(vgmstream, sf, adm3.stream_offset))
        goto fail;
    return vgmstream;

fail:
    close_vgmstream(vgmstream);
    return NULL;
}


static int parse_type(adm3_header_t* adm3, STREAMFILE* sf, uint32_t offset) {

    if (is_id32be(offset, sf, "RMP1")) {
        offset = read_u32le(offset + 0x1c, sf);
        if (!parse_type(adm3, sf, offset))
            goto fail;
        /* 0x24: offset to GRN1 */
    }
    else if (is_id32be(offset, sf, "SMB1")) {
        uint32_t table_count  = read_u32le(offset + 0x10, sf);
        uint32_t table_offset = read_u32le(offset + 0x18, sf);
        int i;

        for (i = 0; i < table_count; i++) {
            uint32_t smp2_unk    = read_u32le(table_offset + i * 0x08 + 0x00, sf);
            uint32_t smp2_offset = read_u32le(table_offset + i * 0x08 + 0x04, sf);

            if (smp2_unk != 1)
                goto fail;

            if (!parse_type(adm3, sf, smp2_offset)) /* SMP2 */
                goto fail;
        }
    }
    else if (is_id32be(offset, sf, "SMP2")) {
        adm3->total_subsongs++;

        if (adm3->target_subsong == adm3->total_subsongs) {
            /* 0x04 always 0 */
            /* 0x08 always 0x00040000 */
            adm3->channels = read_u32le(offset + 0x0c, sf);
            /* 0x10 float pitch? */
            /* 0x14 int pitch? */
            /* 0x18 0x0001? */
            /* 0x1a 0x0030? (header size?) */
            adm3->sample_rate = read_s32le(offset + 0x1c, sf);
            adm3->num_samples = read_s32le(offset + 0x20, sf);
            adm3->stream_size = read_u32le(offset + 0x24, sf);
            /* 0x28 1? */
            adm3->stream_offset = read_u32le(offset + 0x2c, sf);
        }
    }
    else {
        VGM_LOG("ADM3: unknown at %x\n", offset);
        goto fail;
    }

    return 1;
fail:
    return 0;
}

static int parse_adm3(adm3_header_t* adm3, STREAMFILE* sf) {
    uint32_t offset;

    /* 0x04: null */
    /* 0x08: version? */
    /* 0x0c: header size */
    /* 0x10: data start */
    /* rest unknown, looks mostly the same between files */

    /* higher ramp, N samples from low to high */
    offset = read_u32le(0x0FC, sf);
    if (!parse_type(adm3, sf, offset)) goto fail; /* RMP1 */
    if (read_u32le(0x100, sf) != 1) goto fail;

    /* lower ramp, also N samples */
    offset = read_u32le(0x104, sf);
    if (!parse_type(adm3, sf, offset)) goto fail; /* RMP1 */
    if (read_u32le(0x108, sf) != 1) goto fail;

    /* idle engine */
    offset = read_u32le(0x10c, sf);
    if (!parse_type(adm3, sf, offset)) goto fail; /* SMP2 */
    if (read_u32le(0x110, sf) != 1) goto fail;

    if (adm3->target_subsong < 0 || adm3->target_subsong > adm3->total_subsongs || adm3->total_subsongs < 1)
        goto fail;

    return 1;
fail:
    return 0;
}