/*
 * This file is part of the Aaru Data Preservation Suite.
 * Copyright (c) 2019-2025 Natalia Portillo.
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "aaruformat.h"
#include "internal.h"
#include "log.h"

/**
 * @brief Creates a new AaruFormat image file.
 *
 * Allocates and initializes a new aaruformat context and image file with the specified parameters.
 *
 * @param filepath Path to the image file to create.
 * @param mediaType Media type identifier.
 * @param sectorSize Size of each sector in bytes.
 * @param userSectors Number of user data sectors.
 * @param negativeSectors Number of negative sectors.
 * @param overflowSectors Number of overflow sectors.
 * @param options String with creation options.
 * @param applicationName Pointer to the application name string.
 * @param applicationNameLength Length of the application name string.
 * @param applicationMajorVersion Major version of the application.
 * @param applicationMinorVersion Minor version of the application.
 * @return Pointer to the created aaruformat context, or NULL on failure.
 */
void *aaruf_create(const char *filepath, uint32_t mediaType, uint32_t sectorSize, uint64_t userSectors,
                   uint64_t negativeSectors, uint64_t overflowSectors, const char *options,
                   const uint8_t *applicationName, uint8_t applicationNameLength, uint8_t applicationMajorVersion,
                   uint8_t applicationMinorVersion)
{
    TRACE("Entering aaruf_create(%s, %u, %u, %llu, %llu, %llu, %s, %s, %u, %u, %u)", filepath, mediaType, sectorSize,
          userSectors, negativeSectors, overflowSectors, options,
          applicationName ? (const char *)applicationName : "NULL", applicationNameLength, applicationMajorVersion,
          applicationMinorVersion);

    // Parse the options
    TRACE("Parsing options");
    aaru_options parsedOptions = parse_options(options);

    // Allocate context
    TRACE("Allocating memory for context");
    aaruformatContext *ctx = malloc(sizeof(aaruformatContext));
    if(ctx == NULL)
    {
        FATAL("Not enough memory to create context");
        errno = AARUF_ERROR_NOT_ENOUGH_MEMORY;

        TRACE("Exiting aaruf_create() = NULL");
        return NULL;
    }

    memset(ctx, 0, sizeof(aaruformatContext));

    // Create the image file
    TRACE("Creating image file %s", filepath);
    ctx->imageStream = fopen(filepath, "wb+");
    if(ctx->imageStream == NULL)
    {
        FATAL("Error %d opening file %s for writing", errno, filepath);
        free(ctx);
        errno = AARUF_ERROR_CANNOT_CREATE_FILE;

        TRACE("Exiting aaruf_create() = NULL");

        return NULL;
    }

    if(applicationNameLength > AARU_HEADER_APP_NAME_LEN)
    {
        FATAL("Application name too long (%u bytes, maximum %u bytes)", applicationNameLength,
              AARU_HEADER_APP_NAME_LEN);
        free(ctx);
        errno = AARUF_ERROR_INVALID_APP_NAME_LENGTH;

        TRACE("Exiting aaruf_create() = NULL");
        return NULL;
    }

    // Initialize header
    TRACE("Initializing header");
    ctx->header.identifier = AARU_MAGIC;
    memcpy(ctx->header.application, applicationName, applicationNameLength);
    ctx->header.imageMajorVersion       = AARUF_VERSION_V2;
    ctx->header.imageMinorVersion       = 0;
    ctx->header.applicationMajorVersion = applicationMajorVersion;
    ctx->header.applicationMinorVersion = applicationMinorVersion;
    ctx->header.mediaType               = mediaType;
    ctx->header.indexOffset             = 0;
    ctx->header.creationTime            = get_filetime_uint64();
    ctx->header.lastWrittenTime         = get_filetime_uint64();

    ctx->readableSectorTags = (bool *)malloc(sizeof(bool) * MaxSectorTag);

    if(ctx->readableSectorTags == NULL)
    {
        free(ctx);
        errno = AARUF_ERROR_NOT_ENOUGH_MEMORY;

        return NULL;
    }

    memset(ctx->readableSectorTags, 0, sizeof(bool) * MaxSectorTag);

    // Initialize image info
    TRACE("Initializing image info");
    ctx->imageInfo.Application        = ctx->header.application;
    ctx->imageInfo.ApplicationVersion = (uint8_t *)malloc(32);
    if(ctx->imageInfo.ApplicationVersion != NULL)
    {
        memset(ctx->imageInfo.ApplicationVersion, 0, 32);
        sprintf((char *)ctx->imageInfo.ApplicationVersion, "%d.%d", ctx->header.applicationMajorVersion,
                ctx->header.applicationMinorVersion);
    }
    ctx->imageInfo.Version = (uint8_t *)malloc(32);
    if(ctx->imageInfo.Version != NULL)
    {
        memset(ctx->imageInfo.Version, 0, 32);
        sprintf((char *)ctx->imageInfo.Version, "%d.%d", ctx->header.imageMajorVersion, ctx->header.imageMinorVersion);
    }
    ctx->imageInfo.MediaType            = ctx->header.mediaType;
    ctx->imageInfo.ImageSize            = 0;
    ctx->imageInfo.CreationTime         = ctx->header.creationTime;
    ctx->imageInfo.LastModificationTime = ctx->header.lastWrittenTime;
    ctx->imageInfo.XmlMediaType         = aaruf_get_xml_mediatype(ctx->header.mediaType);
    ctx->imageInfo.SectorSize           = sectorSize;

    // Initialize caches
    TRACE("Initializing caches");
    ctx->blockHeaderCache.cache     = NULL;
    ctx->blockHeaderCache.max_items = MAX_CACHE_SIZE / (ctx->imageInfo.SectorSize * (1 << ctx->shift));
    ctx->blockCache.cache           = NULL;
    ctx->blockCache.max_items       = ctx->blockHeaderCache.max_items;

    // TODO: Cache tracks and sessions?

    // Initialize ECC for Compact Disc
    TRACE("Initializing Compact Disc ECC");
    ctx->eccCdContext = (CdEccContext *)aaruf_ecc_cd_init();

    ctx->magic               = AARU_MAGIC;
    ctx->libraryMajorVersion = LIBAARUFORMAT_MAJOR_VERSION;
    ctx->libraryMinorVersion = LIBAARUFORMAT_MINOR_VERSION;

    // Initialize DDT2
    TRACE("Initializing DDT2");
    ctx->inMemoryDdt                           = true;
    ctx->userDataDdtHeader.identifier          = DeDuplicationTable2;
    ctx->userDataDdtHeader.type                = UserData;
    ctx->userDataDdtHeader.compression         = None;
    ctx->userDataDdtHeader.levels              = 2;
    ctx->userDataDdtHeader.tableLevel          = 0;
    ctx->userDataDdtHeader.previousLevelOffset = 0;
    ctx->userDataDdtHeader.negative            = negativeSectors;
    ctx->userDataDdtHeader.blocks              = userSectors + overflowSectors + negativeSectors;
    ctx->userDataDdtHeader.overflow            = overflowSectors;
    ctx->userDataDdtHeader.start               = 0;
    ctx->userDataDdtHeader.blockAlignmentShift = parsedOptions.block_alignment;
    ctx->userDataDdtHeader.dataShift           = parsedOptions.data_shift;
    ctx->userDataDdtHeader.tableShift          = parsedOptions.table_shift;
    ctx->userDataDdtHeader.sizeType            = 1;
    ctx->userDataDdtHeader.entries = ctx->userDataDdtHeader.blocks / (1 << ctx->userDataDdtHeader.tableShift);

    if(ctx->userDataDdtHeader.blocks % (1 << ctx->userDataDdtHeader.tableShift) != 0) ctx->userDataDdtHeader.entries++;

    TRACE("Initializing primary/single DDT");
    if(ctx->userDataDdtHeader.sizeType == SmallDdtSizeType)
        ctx->userDataDdtMini =
            (uint16_t *)calloc(ctx->userDataDdtHeader.entries, sizeof(uint16_t));  // All entries to zero
    else if(ctx->userDataDdtHeader.sizeType == BigDdtSizeType)
        ctx->userDataDdtBig =
            (uint32_t *)calloc(ctx->userDataDdtHeader.entries, sizeof(uint32_t));  // All entries to zero

    // Set the primary DDT offset (just after the header, block aligned)
    ctx->primaryDdtOffset  = sizeof(AaruHeaderV2);  // Start just after the header
    uint64_t alignmentMask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
    ctx->primaryDdtOffset  = (ctx->primaryDdtOffset + alignmentMask) & ~alignmentMask;

    TRACE("Primary DDT will be placed at offset %" PRIu64, ctx->primaryDdtOffset);

    // Calculate size of primary DDT table
    uint64_t primaryTableSize = ctx->userDataDdtHeader.sizeType == SmallDdtSizeType
                                    ? ctx->userDataDdtHeader.entries * sizeof(uint16_t)
                                    : ctx->userDataDdtHeader.entries * sizeof(uint32_t);

    // Calculate where data blocks can start (after primary DDT + header)
    uint64_t dataStartPosition = ctx->primaryDdtOffset + sizeof(DdtHeader2) + primaryTableSize;
    ctx->nextBlockPosition     = (dataStartPosition + alignmentMask) & ~alignmentMask;

    TRACE("Data blocks will start at position %" PRIu64, ctx->nextBlockPosition);

    // Position file pointer at the data start position
    if(fseek(ctx->imageStream, (long)ctx->nextBlockPosition, SEEK_SET) != 0)
    {
        FATAL("Could not seek to data start position");
        free(ctx->readableSectorTags);
        if(ctx->userDataDdtMini) free(ctx->userDataDdtMini);
        if(ctx->userDataDdtBig) free(ctx->userDataDdtBig);
        utarray_free(ctx->indexEntries);
        free(ctx);
        errno = AARUF_ERROR_CANNOT_CREATE_FILE;
        return NULL;
    }

    // Initialize index entries array
    TRACE("Initializing index entries array");
    UT_icd index_entry_icd = {sizeof(IndexEntry), NULL, NULL, NULL};
    utarray_new(ctx->indexEntries, &index_entry_icd);

    if(ctx->indexEntries == NULL)
    {
        FATAL("Not enough memory to create index entries array");
        free(ctx->readableSectorTags);
        free(ctx);
        errno = AARUF_ERROR_NOT_ENOUGH_MEMORY;

        TRACE("Exiting aaruf_create() = NULL");
        return NULL;
    }

    // Is writing
    ctx->isWriting = true;

    TRACE("Exiting aaruf_create() = %p", ctx);
    // Return context
    return ctx;
}