// EXT filesystem implementation (ext2/ext3/ext4)

import { BaseFilesystem } from './base.js';
import { checkDependencies, updateResultItem } from '../utils.js';

export class EXTFilesystem extends BaseFilesystem {
    constructor() {
        super('EXT', [
            {
                id: 'ext',
                name: 'EXT (ext2/ext3/ext4)',
                constants: [
                    { id: 'partitionStartEXT', label: 'Partitionsstart (Basis-Offset)', unit: 'Bytes', default: '0x0' },
                    { id: 'superblockOffsetEXT', label: 'Superblock-Offset (relativ zur Partition)', unit: 'Bytes', default: '0x400' }
                ],
                inputs: [
                    { id: 'blockSizeExpEXT', label: 'Block-Größe Exponent (Offset 0x418)', unit: 'Exponent n', placeholder: '0x0' },
                    { id: 'blocksPerGroupEXT', label: 'Blöcke pro Blockgruppe (Offset 0x420)', unit: 'Anzahl', placeholder: '0x8000' },
                    { id: 'inodesPerGroupEXT', label: 'Inodes pro Blockgruppe (Offset 0x428)', unit: 'Anzahl', placeholder: '0x2000' },
                    { id: 'inodeSizeEXT', label: 'Inode-Größe (Offset 0x458)', unit: 'Bytes', placeholder: '0x100' },
                    { id: 'totalBlocksEXT', label: 'Gesamtanzahl Blöcke (Offset 0x404)', unit: 'Anzahl', placeholder: '0x40000' },
                    { id: 'groupDescSizeEXT', label: 'Größe Gruppendeskriptor (Offset 0x4FE)', unit: 'Bytes', placeholder: '0x20' },
                    { id: 'inodeTableBlockGroupEXT', label: 'Inode-Tabelle Block (aus GDT, Offset 0x08)', unit: 'Block-Nummer', placeholder: '0x21' },
                    { id: 'targetInodeEXT', label: 'Gesuchter Inode', unit: 'Nummer', placeholder: '0x02' },
                    { id: 'targetBlockEXT', label: 'Gesuchter Block', unit: 'Nummer', placeholder: '0x100' },
                    { id: 'blockgroupNumberEXT', label: 'Blockgruppen-Nummer', unit: 'Nummer', placeholder: '0x0' }
                ],
                resultGroups: [
                    {
                        name: 'Basis-Berechnungen',
                        results: [
                            { id: 'superblockPosEXT', label: 'Superblock Position', dependencies: ['partitionStartEXT', 'superblockOffsetEXT'], formula: 'Partitionsstart + 0x400' },
                            { id: 'blockSizeBytesEXT', label: 'Block-Größe (Bytes)', dependencies: ['blockSizeExpEXT'], formula: '2^(10+n) Bytes' },
                            { id: 'totalBlockgroupsEXT', label: 'Anzahl Blockgruppen', dependencies: ['totalBlocksEXT', 'blocksPerGroupEXT'], formula: 'Aufrunden(Gesamtblöcke ÷ Blöcke pro Gruppe)' }
                        ]
                    },
                    {
                        name: 'Gruppendeskriptor-Tabelle',
                        results: [
                            { id: 'gdtStartEXT', label: 'GDT Start', dependencies: ['partitionStartEXT', 'superblockOffsetEXT', 'blockSizeExpEXT'], formula: 'Partitionsstart + Block nach Superblock' },
                            { id: 'gdtBlockgroupOffsetEXT', label: 'GDT-Eintrag für Blockgruppe', dependencies: ['partitionStartEXT', 'superblockOffsetEXT', 'blockSizeExpEXT', 'blockgroupNumberEXT', 'groupDescSizeEXT'], formula: 'GDT Start + (Blockgruppe × GD-Größe)' }
                        ]
                    },
                    {
                        name: 'Inode-Berechnungen',
                        results: [
                            { id: 'inodeBlockgroupEXT', label: 'Blockgruppe des Inodes', dependencies: ['targetInodeEXT', 'inodesPerGroupEXT'], formula: 'Abrunden((Inode - 1) ÷ Inodes pro Gruppe)' },
                            { id: 'inodeRelativeIndexEXT', label: 'Relativer Index in Blockgruppe', dependencies: ['targetInodeEXT', 'inodesPerGroupEXT'], formula: '(Inode - 1) % Inodes pro Gruppe' },
                            { id: 'inodeTableStartEXT', label: 'Inode-Tabelle Start', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT'], formula: 'Partitionsstart + (Block × Block-Größe)' },
                            { id: 'inodeOffsetEXT', label: 'Inode Offset', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'targetInodeEXT', 'inodesPerGroupEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (Relativer Index × Inode-Größe)' }
                        ]
                    },
                    {
                        name: 'Block-Berechnungen',
                        results: [
                            { id: 'blockOffsetEXT', label: 'Block Offset', dependencies: ['partitionStartEXT', 'targetBlockEXT', 'blockSizeExpEXT'], formula: 'Partitionsstart + (Block-Nummer × Block-Größe)' }
                        ]
                    },
                    {
                        name: 'Reservierte Inodes (Systemdateien)',
                        results: [
                            { id: 'badBlocksInodeEXT', label: 'Inode 1 - Beschädigte Blöcke', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (0 × Inode-Größe)' },
                            { id: 'rootDirInodeEXT', label: 'Inode 2 - Wurzelverzeichnis', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (1 × Inode-Größe)' },
                            { id: 'userQuotaInodeEXT', label: 'Inode 3 - Benutzer-Quotas', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (2 × Inode-Größe)' },
                            { id: 'groupQuotaInodeEXT', label: 'Inode 4 - Gruppen-Quotas', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (3 × Inode-Größe)' },
                            { id: 'bootloaderInodeEXT', label: 'Inode 5 - Bootloader', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (4 × Inode-Größe)' },
                            { id: 'journalInodeEXT', label: 'Inode 8 - Journal (ext3/ext4)', dependencies: ['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT', 'inodeSizeEXT'], formula: 'Inode-Tabelle Start + (7 × Inode-Größe)' }
                        ]
                    },
                    {
                        name: 'Inode-Tabellen-Übersicht',
                        results: [
                            { id: 'inodeTableSizeEXT', label: 'Inode-Tabelle Größe (Bytes)', dependencies: ['inodesPerGroupEXT', 'inodeSizeEXT'], formula: 'Inodes pro Gruppe × Inode-Größe' },
                            { id: 'inodeTableSizeBlocksEXT', label: 'Inode-Tabelle Größe (Blöcke)', dependencies: ['inodesPerGroupEXT', 'inodeSizeEXT', 'blockSizeExpEXT'], formula: 'Aufrunden(Tabellengröße ÷ Block-Größe)' }
                        ]
                    }
                ],
                formulas: [
                    { name: 'Superblock Position', expression: 'Partitionsstart + 0x400 (immer fix bei Offset 0x400)' },
                    { name: 'Block-Größe', expression: '2^(10+n) Bytes, wobei n der Exponent aus Offset 0x418 ist (0 = 1024, 1 = 2048, 2 = 4096, etc.)' },
                    { name: 'Anzahl Blockgruppen', expression: 'Aufrunden(Gesamtanzahl Blöcke ÷ Blöcke pro Blockgruppe)' },
                    { name: 'GDT Start', expression: 'Partitionsstart + (Block nach Superblock × Block-Größe)' },
                    { name: 'GDT-Eintrag Offset', expression: 'GDT Start + (Blockgruppen-Nummer × Gruppendeskriptor-Größe)' },
                    { name: 'Blockgruppe des Inodes', expression: 'Abrunden((Inode-Nummer - 1) ÷ Inodes pro Blockgruppe)' },
                    { name: 'Relativer Index', expression: '(Inode-Nummer - 1) % Inodes pro Blockgruppe' },
                    { name: 'Inode-Tabelle Start', expression: 'Partitionsstart + (Inode-Tabelle Block-Nummer × Block-Größe)' },
                    { name: 'Inode Offset', expression: 'Inode-Tabelle Start + (Relativer Index × Inode-Größe)' },
                    { name: 'Block Offset', expression: 'Partitionsstart + (Block-Nummer × Block-Größe)' },
                    { name: 'Reservierte Inodes', expression: 'Inode-Tabelle Start + ((Inode-Nummer - 1) × Inode-Größe)' },
                    { name: 'Inode-Tabelle Größe', expression: 'Inodes pro Blockgruppe × Inode-Größe' }
                ]
            }
        ]);
    }

    calculate(variantId) {
        if (variantId !== 'ext') return;
        
        const values = this.getInputValues(variantId);
        const results = {};
        
        this.calculateEXT(values, results);
    }

    calculateEXT(values, results) {
        // Superblock Position
        if (checkDependencies(['partitionStartEXT', 'superblockOffsetEXT'])) {
            results.superblockPos = values.partitionStartEXT + values.superblockOffsetEXT;
            updateResultItem('superblockPosEXT', results.superblockPos, true,
                `0x${values.partitionStartEXT.toString(16)} + 0x${values.superblockOffsetEXT.toString(16)} = 0x${results.superblockPos.toString(16)}`);
        } else {
            updateResultItem('superblockPosEXT', 0, false);
        }

        // Block Size (2^(10+n))
        if (checkDependencies(['blockSizeExpEXT'])) {
            results.blockSize = Math.pow(2, 10 + values.blockSizeExpEXT);
            updateResultItem('blockSizeBytesEXT', results.blockSize, true,
                `2^(10 + ${values.blockSizeExpEXT}) = 2^${10 + values.blockSizeExpEXT} = 0x${results.blockSize.toString(16)} (${results.blockSize} Bytes)`);
        } else {
            updateResultItem('blockSizeBytesEXT', 0, false);
        }

        // Total Blockgroups
        if (checkDependencies(['totalBlocksEXT', 'blocksPerGroupEXT'])) {
            results.totalBlockgroups = Math.ceil(values.totalBlocksEXT / values.blocksPerGroupEXT);
            updateResultItem('totalBlockgroupsEXT', results.totalBlockgroups, true,
                `Aufrunden(0x${values.totalBlocksEXT.toString(16)} ÷ 0x${values.blocksPerGroupEXT.toString(16)}) = ${results.totalBlockgroups}`);
        } else {
            updateResultItem('totalBlockgroupsEXT', 0, false);
        }

        // GDT Start (block after superblock)
        if (checkDependencies(['partitionStartEXT', 'superblockOffsetEXT', 'blockSizeExpEXT']) && results.blockSize !== undefined) {
            // If block size is 1024 (0x400), superblock is in block 1, GDT starts at block 2
            // Otherwise, superblock is in block 0, GDT starts at block 1
            const superblockBlock = (results.blockSize === 1024) ? 1 : 0;
            const gdtBlock = superblockBlock + 1;
            results.gdtStart = values.partitionStartEXT + (gdtBlock * results.blockSize);
            updateResultItem('gdtStartEXT', results.gdtStart, true,
                `0x${values.partitionStartEXT.toString(16)} + (Block ${gdtBlock} × 0x${results.blockSize.toString(16)}) = 0x${results.gdtStart.toString(16)}`);
        } else {
            updateResultItem('gdtStartEXT', 0, false);
        }

        // GDT Entry for specific Blockgroup
        if (checkDependencies(['blockgroupNumberEXT', 'groupDescSizeEXT']) && results.gdtStart !== undefined) {
            results.gdtBlockgroupOffset = results.gdtStart + (values.blockgroupNumberEXT * values.groupDescSizeEXT);
            updateResultItem('gdtBlockgroupOffsetEXT', results.gdtBlockgroupOffset, true,
                `0x${results.gdtStart.toString(16)} + (0x${values.blockgroupNumberEXT.toString(16)} × 0x${values.groupDescSizeEXT.toString(16)}) = 0x${results.gdtBlockgroupOffset.toString(16)}`);
        } else {
            updateResultItem('gdtBlockgroupOffsetEXT', 0, false);
        }

        // Inode Blockgroup
        if (checkDependencies(['targetInodeEXT', 'inodesPerGroupEXT'])) {
            results.inodeBlockgroup = Math.floor((values.targetInodeEXT - 1) / values.inodesPerGroupEXT);
            updateResultItem('inodeBlockgroupEXT', results.inodeBlockgroup, true,
                `Abrunden((0x${values.targetInodeEXT.toString(16)} - 1) ÷ 0x${values.inodesPerGroupEXT.toString(16)}) = ${results.inodeBlockgroup}`);
        } else {
            updateResultItem('inodeBlockgroupEXT', 0, false);
        }

        // Inode Relative Index
        if (checkDependencies(['targetInodeEXT', 'inodesPerGroupEXT'])) {
            results.inodeRelativeIndex = (values.targetInodeEXT - 1) % values.inodesPerGroupEXT;
            updateResultItem('inodeRelativeIndexEXT', results.inodeRelativeIndex, true,
                `(0x${values.targetInodeEXT.toString(16)} - 1) % 0x${values.inodesPerGroupEXT.toString(16)} = 0x${results.inodeRelativeIndex.toString(16)}`);
        } else {
            updateResultItem('inodeRelativeIndexEXT', 0, false);
        }

        // Inode Table Start
        if (checkDependencies(['partitionStartEXT', 'inodeTableBlockGroupEXT', 'blockSizeExpEXT']) && results.blockSize !== undefined) {
            results.inodeTableStart = values.partitionStartEXT + (values.inodeTableBlockGroupEXT * results.blockSize);
            updateResultItem('inodeTableStartEXT', results.inodeTableStart, true,
                `0x${values.partitionStartEXT.toString(16)} + (0x${values.inodeTableBlockGroupEXT.toString(16)} × 0x${results.blockSize.toString(16)}) = 0x${results.inodeTableStart.toString(16)}`);
        } else {
            updateResultItem('inodeTableStartEXT', 0, false);
        }

        // Inode Offset
        if (checkDependencies(['targetInodeEXT', 'inodesPerGroupEXT', 'inodeSizeEXT']) && results.inodeTableStart !== undefined && results.inodeRelativeIndex !== undefined) {
            results.inodeOffset = results.inodeTableStart + (results.inodeRelativeIndex * values.inodeSizeEXT);
            updateResultItem('inodeOffsetEXT', results.inodeOffset, true,
                `0x${results.inodeTableStart.toString(16)} + (0x${results.inodeRelativeIndex.toString(16)} × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.inodeOffset.toString(16)}`);
        } else {
            updateResultItem('inodeOffsetEXT', 0, false);
        }

        // Block Offset
        if (checkDependencies(['partitionStartEXT', 'targetBlockEXT', 'blockSizeExpEXT']) && results.blockSize !== undefined) {
            results.blockOffset = values.partitionStartEXT + (values.targetBlockEXT * results.blockSize);
            updateResultItem('blockOffsetEXT', results.blockOffset, true,
                `0x${values.partitionStartEXT.toString(16)} + (0x${values.targetBlockEXT.toString(16)} × 0x${results.blockSize.toString(16)}) = 0x${results.blockOffset.toString(16)}`);
        } else {
            updateResultItem('blockOffsetEXT', 0, false);
        }

        // Reserved Inodes (always in blockgroup 0, inode table)
        if (results.inodeTableStart !== undefined && checkDependencies(['inodeSizeEXT'])) {
            // Inode 1 (Bad Blocks) - Index 0
            results.badBlocksInode = results.inodeTableStart + (0 * values.inodeSizeEXT);
            updateResultItem('badBlocksInodeEXT', results.badBlocksInode, true,
                `0x${results.inodeTableStart.toString(16)} + (0 × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.badBlocksInode.toString(16)}`);

            // Inode 2 (Root Directory) - Index 1
            results.rootDirInode = results.inodeTableStart + (1 * values.inodeSizeEXT);
            updateResultItem('rootDirInodeEXT', results.rootDirInode, true,
                `0x${results.inodeTableStart.toString(16)} + (1 × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.rootDirInode.toString(16)}`);

            // Inode 3 (User Quotas) - Index 2
            results.userQuotaInode = results.inodeTableStart + (2 * values.inodeSizeEXT);
            updateResultItem('userQuotaInodeEXT', results.userQuotaInode, true,
                `0x${results.inodeTableStart.toString(16)} + (2 × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.userQuotaInode.toString(16)}`);

            // Inode 4 (Group Quotas) - Index 3
            results.groupQuotaInode = results.inodeTableStart + (3 * values.inodeSizeEXT);
            updateResultItem('groupQuotaInodeEXT', results.groupQuotaInode, true,
                `0x${results.inodeTableStart.toString(16)} + (3 × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.groupQuotaInode.toString(16)}`);

            // Inode 5 (Bootloader) - Index 4
            results.bootloaderInode = results.inodeTableStart + (4 * values.inodeSizeEXT);
            updateResultItem('bootloaderInodeEXT', results.bootloaderInode, true,
                `0x${results.inodeTableStart.toString(16)} + (4 × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.bootloaderInode.toString(16)}`);

            // Inode 8 (Journal) - Index 7
            results.journalInode = results.inodeTableStart + (7 * values.inodeSizeEXT);
            updateResultItem('journalInodeEXT', results.journalInode, true,
                `0x${results.inodeTableStart.toString(16)} + (7 × 0x${values.inodeSizeEXT.toString(16)}) = 0x${results.journalInode.toString(16)}`);
        } else {
            updateResultItem('badBlocksInodeEXT', 0, false);
            updateResultItem('rootDirInodeEXT', 0, false);
            updateResultItem('userQuotaInodeEXT', 0, false);
            updateResultItem('groupQuotaInodeEXT', 0, false);
            updateResultItem('bootloaderInodeEXT', 0, false);
            updateResultItem('journalInodeEXT', 0, false);
        }

        // Inode Table Size (Bytes)
        if (checkDependencies(['inodesPerGroupEXT', 'inodeSizeEXT'])) {
            results.inodeTableSize = values.inodesPerGroupEXT * values.inodeSizeEXT;
            updateResultItem('inodeTableSizeEXT', results.inodeTableSize, true,
                `0x${values.inodesPerGroupEXT.toString(16)} × 0x${values.inodeSizeEXT.toString(16)} = 0x${results.inodeTableSize.toString(16)} (${results.inodeTableSize} Bytes)`);
        } else {
            updateResultItem('inodeTableSizeEXT', 0, false);
        }

        // Inode Table Size (Blocks)
        if (checkDependencies(['inodesPerGroupEXT', 'inodeSizeEXT', 'blockSizeExpEXT']) && results.blockSize !== undefined && results.inodeTableSize !== undefined) {
            results.inodeTableSizeBlocks = Math.ceil(results.inodeTableSize / results.blockSize);
            updateResultItem('inodeTableSizeBlocksEXT', results.inodeTableSizeBlocks, true,
                `Aufrunden(0x${results.inodeTableSize.toString(16)} ÷ 0x${results.blockSize.toString(16)}) = ${results.inodeTableSizeBlocks} Blöcke`);
        } else {
            updateResultItem('inodeTableSizeBlocksEXT', 0, false);
        }
    }
}