/**
 * @node image
 * @name Image
 * @category image
 * @version 1.0.0
 * @description Extract image information, metadata, and EXIF data using ImageMagick
 * @icon image
 */

const configSchema = {
    type: 'object',
    properties: {
        operation: {
            type: 'string',
            title: 'Operation',
            enum: ['info', 'resize', 'crop', 'rotate', 'filter', 'convert'],
            enumLabels: ['Info', 'Resize', 'Crop', 'Rotate', 'Filter', 'Convert Format'],
            default: 'info',
            description: 'Image operation to perform'
        },
        inputSource: {
            type: 'string',
            title: 'Input Source',
            enum: ['auto', 'base64', 'filePath', 'url', 'storage'],
            enumLabels: ['Auto-detect', 'Base64 Data', 'File Path', 'URL', 'Storage Reference'],
            default: 'auto',
            description: 'Source type for the input image'
        },
        base64Data: {
            type: 'string',
            title: 'Base64 Image Data',
            description: 'Base64-encoded image data. Supports {{variable}} interpolation.',
            showWhen: { field: 'inputSource', value: 'base64' }
        },
        filePath: {
            type: 'string',
            title: 'File Path',
            description: 'Path to image file on runner filesystem. Supports {{variable}} interpolation.',
            showWhen: { field: 'inputSource', value: 'filePath' }
        },
        url: {
            type: 'string',
            title: 'Image URL',
            description: 'URL to download image from. Supports {{variable}} interpolation.',
            showWhen: { field: 'inputSource', value: 'url' }
        },
        storageCollection: {
            type: 'string',
            title: 'Storage Collection',
            description: 'Collection name for stored image',
            showWhen: { field: 'inputSource', value: 'storage' }
        },
        storageId: {
            type: 'string',
            title: 'Storage Document ID',
            description: 'Document ID in storage collection. Supports {{variable}} interpolation.',
            showWhen: { field: 'inputSource', value: 'storage' }
        },
        includeExif: {
            type: 'boolean',
            title: 'Include EXIF Metadata',
            default: true,
            description: 'Extract EXIF metadata (camera info, GPS, date taken, etc.)',
            showWhen: { field: 'operation', value: 'info' }
        },
        timeout: {
            type: 'number',
            title: 'Timeout (ms)',
            default: 30000,
            minimum: 1000,
            maximum: 120000,
            description: 'Maximum time to wait for image processing'
        }
    },
    required: ['operation']
};

const inputSchema = {
    type: 'object',
    properties: {
        data: {
            type: 'any',
            description: 'Input data. Can be base64 string, file path, URL, or binary object from another node.'
        },
        file: {
            type: 'object',
            description: 'Binary file object with type, data (base64), mimeType, filename'
        },
        storage: {
            type: 'object',
            description: 'Storage reference with collection and id'
        },
        base64: {
            type: 'string',
            description: 'Base64-encoded image data'
        },
        filePath: {
            type: 'string',
            description: 'Override file path from input'
        },
        url: {
            type: 'string',
            description: 'Override URL from input'
        }
    }
};

const outputSchema = {
    type: 'object',
    properties: {
        width: {
            type: 'number',
            description: 'Image width in pixels'
        },
        height: {
            type: 'number',
            description: 'Image height in pixels'
        },
        format: {
            type: 'string',
            description: 'Image format (JPEG, PNG, GIF, etc.)'
        },
        colorSpace: {
            type: 'string',
            description: 'Color space (sRGB, CMYK, Grayscale, etc.)'
        },
        depth: {
            type: 'number',
            description: 'Bit depth per channel'
        },
        fileSize: {
            type: 'number',
            description: 'File size in bytes'
        },
        dpi: {
            type: 'object',
            description: 'DPI/resolution information',
            properties: {
                x: { type: 'number' },
                y: { type: 'number' },
                unit: { type: 'string' }
            }
        },
        hasAlpha: {
            type: 'boolean',
            description: 'Whether image has alpha/transparency channel'
        },
        compression: {
            type: 'string',
            description: 'Compression type used'
        },
        exif: {
            type: 'object',
            description: 'EXIF metadata (if available)',
            properties: {
                camera: {
                    type: 'object',
                    properties: {
                        make: { type: 'string' },
                        model: { type: 'string' },
                        software: { type: 'string' }
                    }
                },
                datetime: {
                    type: 'object',
                    properties: {
                        original: { type: 'string' },
                        digitized: { type: 'string' },
                        modified: { type: 'string' }
                    }
                },
                gps: {
                    type: 'object',
                    properties: {
                        latitude: { type: 'number' },
                        longitude: { type: 'number' },
                        altitude: { type: 'number' },
                        latitudeRef: { type: 'string' },
                        longitudeRef: { type: 'string' }
                    }
                },
                exposure: {
                    type: 'object',
                    properties: {
                        time: { type: 'string' },
                        fNumber: { type: 'number' },
                        iso: { type: 'number' },
                        program: { type: 'string' },
                        bias: { type: 'string' }
                    }
                },
                lens: {
                    type: 'object',
                    properties: {
                        focalLength: { type: 'string' },
                        focalLength35mm: { type: 'number' },
                        aperture: { type: 'number' },
                        make: { type: 'string' },
                        model: { type: 'string' }
                    }
                },
                orientation: { type: 'number' },
                flash: { type: 'string' },
                whiteBalance: { type: 'string' },
                meteringMode: { type: 'string' }
            }
        },
        sourceType: {
            type: 'string',
            description: 'Source type used (base64, filePath, url, storage)'
        },
        sourcePath: {
            type: 'string',
            description: 'Temporary file path used for processing'
        }
    }
};

function interpolate(template, data) {
    if (typeof template !== 'string') return template;
    return template.replace(/\{\{([^}]+)\}\}/g, function(match, key) {
        var keys = key.trim().split('.');
        var value = data;
        for (var i = 0; i < keys.length; i++) {
            if (value && typeof value === 'object' && keys[i] in value) {
                value = value[keys[i]];
            } else {
                return match;
            }
        }
        return value !== undefined ? String(value) : match;
    });
}

function generateTempPath(extension) {
    var uuid = smartbotic.utils.uuid();
    return '/tmp/smartbotic-image-' + uuid + (extension ? '.' + extension : '');
}

function detectImageFormat(base64Data) {
    if (!base64Data || base64Data.length < 8) return null;

    var header = smartbotic.utils.base64Decode(base64Data.substring(0, 16));
    if (!header) return null;

    if (header.charCodeAt(0) === 0xFF && header.charCodeAt(1) === 0xD8 && header.charCodeAt(2) === 0xFF) {
        return 'jpg';
    }
    if (header.substring(0, 8) === '\x89PNG\r\n\x1a\n') {
        return 'png';
    }
    if (header.substring(0, 6) === 'GIF87a' || header.substring(0, 6) === 'GIF89a') {
        return 'gif';
    }
    if (header.substring(0, 4) === 'RIFF' && header.substring(8, 12) === 'WEBP') {
        return 'webp';
    }
    if (header.substring(0, 2) === 'BM') {
        return 'bmp';
    }
    if (header.substring(0, 4) === 'II*\x00' || header.substring(0, 4) === 'MM\x00*') {
        return 'tiff';
    }

    return null;
}

function resolveImageInput(config, input) {
    var inputSource = config.inputSource || 'auto';
    var result = { type: null, data: null, path: null, tempPath: null };

    if (inputSource === 'filePath' || (inputSource === 'auto' && input.filePath)) {
        var filePath = input.filePath || interpolate(config.filePath, input);
        if (filePath && smartbotic.fs.exists(filePath)) {
            result.type = 'filePath';
            result.path = filePath;
            return result;
        }
    }

    if (inputSource === 'base64' || (inputSource === 'auto' && (input.base64 || config.base64Data))) {
        var base64 = input.base64 || interpolate(config.base64Data, input);
        if (base64) {
            result.type = 'base64';
            result.data = base64;
            return result;
        }
    }

    if (inputSource === 'url' || (inputSource === 'auto' && (input.url || config.url))) {
        var url = input.url || interpolate(config.url, input);
        if (url) {
            result.type = 'url';
            result.data = url;
            return result;
        }
    }

    if (inputSource === 'storage' || (inputSource === 'auto' && input.storage)) {
        var collection = input.storage ? input.storage.collection : config.storageCollection;
        var id = input.storage ? input.storage.id : interpolate(config.storageId, input);
        if (collection && id) {
            result.type = 'storage';
            result.data = { collection: collection, id: id };
            return result;
        }
    }

    if (inputSource === 'auto') {
        if (input.file && input.file.type === 'binary' && input.file.data) {
            result.type = 'base64';
            result.data = input.file.data;
            return result;
        }

        if (typeof input.data === 'string') {
            if (input.data.match(/^[A-Za-z0-9+/]+=*$/) && input.data.length > 100) {
                result.type = 'base64';
                result.data = input.data;
                return result;
            }

            if (input.data.startsWith('http://') || input.data.startsWith('https://')) {
                result.type = 'url';
                result.data = input.data;
                return result;
            }

            if (smartbotic.fs.exists(input.data)) {
                result.type = 'filePath';
                result.path = input.data;
                return result;
            }
        }

        if (input.data && typeof input.data === 'object') {
            if (input.data.type === 'binary' && input.data.data) {
                result.type = 'base64';
                result.data = input.data.data;
                return result;
            }
            if (input.data.collection && input.data.id) {
                result.type = 'storage';
                result.data = input.data;
                return result;
            }
        }
    }

    return result;
}

function prepareImageFile(imageInput, timeout) {
    var tempPath = null;

    if (imageInput.type === 'filePath') {
        return { path: imageInput.path, tempPath: null };
    }

    if (imageInput.type === 'base64') {
        var ext = detectImageFormat(imageInput.data) || 'img';
        tempPath = generateTempPath(ext);
        var writeResult = smartbotic.fs.writeFile(tempPath, imageInput.data, 'base64');
        if (!writeResult.success) {
            throw new Error('Failed to write temp file: ' + (writeResult.error || 'Unknown error'));
        }
        return { path: tempPath, tempPath: tempPath };
    }

    if (imageInput.type === 'url') {
        smartbotic.log.info('Downloading image from URL: ' + imageInput.data);
        var response = smartbotic.http.request({
            method: 'GET',
            url: imageInput.data,
            timeout: timeout
        });

        if (response.status < 200 || response.status >= 300) {
            throw new Error('Failed to download image: HTTP ' + response.status);
        }

        var contentType = response.headers['content-type'] || '';
        var ext = 'img';
        if (contentType.includes('jpeg') || contentType.includes('jpg')) ext = 'jpg';
        else if (contentType.includes('png')) ext = 'png';
        else if (contentType.includes('gif')) ext = 'gif';
        else if (contentType.includes('webp')) ext = 'webp';

        tempPath = generateTempPath(ext);
        var base64Data = smartbotic.utils.base64Encode(response.data);
        var writeResult = smartbotic.fs.writeFile(tempPath, base64Data, 'base64');
        if (!writeResult.success) {
            throw new Error('Failed to write downloaded image: ' + (writeResult.error || 'Unknown error'));
        }
        return { path: tempPath, tempPath: tempPath };
    }

    if (imageInput.type === 'storage') {
        var storageResult = smartbotic.storage.get(imageInput.data.collection, imageInput.data.id);
        if (!storageResult.found) {
            throw new Error('Image not found in storage: ' + imageInput.data.collection + '/' + imageInput.data.id);
        }

        var doc = storageResult.document;
        var base64Data = doc.data || doc.content || doc.base64;
        if (!base64Data) {
            throw new Error('Storage document does not contain image data');
        }

        var ext = detectImageFormat(base64Data) || 'img';
        tempPath = generateTempPath(ext);
        var writeResult = smartbotic.fs.writeFile(tempPath, base64Data, 'base64');
        if (!writeResult.success) {
            throw new Error('Failed to write storage image: ' + (writeResult.error || 'Unknown error'));
        }
        return { path: tempPath, tempPath: tempPath };
    }

    throw new Error('No valid image input found');
}

function cleanupTempFile(tempPath) {
    if (tempPath) {
        try {
            smartbotic.fs.unlink(tempPath);
        } catch (e) {
            smartbotic.log.warn('Failed to cleanup temp file: ' + tempPath);
        }
    }
}

function parseImageMagickInfo(output) {
    var info = {};

    var lines = output.split('\n');
    for (var i = 0; i < lines.length; i++) {
        var line = lines[i].trim();
        if (!line) continue;

        var colonIdx = line.indexOf(':');
        if (colonIdx > 0) {
            var key = line.substring(0, colonIdx).trim().toLowerCase();
            var value = line.substring(colonIdx + 1).trim();

            if (key === 'image' || key === 'format') {
                var formatMatch = value.match(/^(\w+)/);
                if (formatMatch) info.format = formatMatch[1].toUpperCase();
            }
            else if (key === 'geometry' || key === 'page geometry') {
                var geomMatch = value.match(/(\d+)x(\d+)/);
                if (geomMatch) {
                    info.width = parseInt(geomMatch[1], 10);
                    info.height = parseInt(geomMatch[2], 10);
                }
            }
            else if (key === 'colorspace') {
                info.colorSpace = value;
            }
            else if (key === 'depth') {
                var depthMatch = value.match(/(\d+)/);
                if (depthMatch) info.depth = parseInt(depthMatch[1], 10);
            }
            else if (key === 'channel depth' || key === 'channels') {
                if (value.toLowerCase().includes('alpha')) {
                    info.hasAlpha = true;
                }
            }
            else if (key === 'alpha') {
                info.hasAlpha = value.toLowerCase() !== 'undefined' && value.toLowerCase() !== 'off';
            }
            else if (key === 'compression') {
                info.compression = value;
            }
            else if (key === 'resolution' || key === 'units') {
                if (!info.dpi) info.dpi = {};
                var resMatch = value.match(/([\d.]+)x([\d.]+)/);
                if (resMatch) {
                    info.dpi.x = parseFloat(resMatch[1]);
                    info.dpi.y = parseFloat(resMatch[2]);
                }
                if (value.includes('PixelsPerInch')) info.dpi.unit = 'dpi';
                else if (value.includes('PixelsPerCentimeter')) info.dpi.unit = 'dpcm';
            }
            else if (key === 'filesize') {
                var sizeMatch = value.match(/([\d.]+)\s*(\w+)/);
                if (sizeMatch) {
                    var size = parseFloat(sizeMatch[1]);
                    var unit = sizeMatch[2].toUpperCase();
                    if (unit === 'B') info.fileSize = Math.round(size);
                    else if (unit === 'KB' || unit === 'KIB') info.fileSize = Math.round(size * 1024);
                    else if (unit === 'MB' || unit === 'MIB') info.fileSize = Math.round(size * 1024 * 1024);
                    else if (unit === 'GB' || unit === 'GIB') info.fileSize = Math.round(size * 1024 * 1024 * 1024);
                }
            }
        }
    }

    if (info.hasAlpha === undefined) info.hasAlpha = false;

    return info;
}

function parseExifToolOutput(output) {
    var exif = {
        camera: {},
        datetime: {},
        gps: {},
        exposure: {},
        lens: {}
    };

    var lines = output.split('\n');
    for (var i = 0; i < lines.length; i++) {
        var line = lines[i].trim();
        if (!line) continue;

        var colonIdx = line.indexOf(':');
        if (colonIdx <= 0) continue;

        var key = line.substring(0, colonIdx).trim().toLowerCase().replace(/\s+/g, '');
        var value = line.substring(colonIdx + 1).trim();

        if (!value || value === '-' || value === 'n/a') continue;

        if (key === 'make' || key === 'cameramake') exif.camera.make = value;
        else if (key === 'model' || key === 'cameramodel' || key === 'cameramodelname') exif.camera.model = value;
        else if (key === 'software') exif.camera.software = value;

        else if (key === 'datetimeoriginal' || key === 'createdate') exif.datetime.original = value;
        else if (key === 'datetimedigitized' || key === 'digitizeddate') exif.datetime.digitized = value;
        else if (key === 'modifydate' || key === 'datetime') exif.datetime.modified = value;

        else if (key === 'gpslatitude') {
            var latMatch = value.match(/([\d.]+)/);
            if (latMatch) {
                exif.gps.latitude = parseFloat(latMatch[1]);
                if (value.includes('S')) exif.gps.latitude = -exif.gps.latitude;
                exif.gps.latitudeRef = value.includes('S') ? 'S' : 'N';
            }
        }
        else if (key === 'gpslongitude') {
            var lonMatch = value.match(/([\d.]+)/);
            if (lonMatch) {
                exif.gps.longitude = parseFloat(lonMatch[1]);
                if (value.includes('W')) exif.gps.longitude = -exif.gps.longitude;
                exif.gps.longitudeRef = value.includes('W') ? 'W' : 'E';
            }
        }
        else if (key === 'gpsaltitude') {
            var altMatch = value.match(/([\d.]+)/);
            if (altMatch) exif.gps.altitude = parseFloat(altMatch[1]);
        }

        else if (key === 'exposuretime' || key === 'shutterspeed') exif.exposure.time = value;
        else if (key === 'fnumber' || key === 'aperture') {
            var fMatch = value.match(/([\d.]+)/);
            if (fMatch) exif.exposure.fNumber = parseFloat(fMatch[1]);
        }
        else if (key === 'iso' || key === 'isospeedratings') {
            var isoMatch = value.match(/(\d+)/);
            if (isoMatch) exif.exposure.iso = parseInt(isoMatch[1], 10);
        }
        else if (key === 'exposureprogram') exif.exposure.program = value;
        else if (key === 'exposurecompensation' || key === 'exposurebias') exif.exposure.bias = value;

        else if (key === 'focallength') exif.lens.focalLength = value;
        else if (key === 'focallengthin35mmformat' || key === 'focallength35efl') {
            var fl35Match = value.match(/(\d+)/);
            if (fl35Match) exif.lens.focalLength35mm = parseInt(fl35Match[1], 10);
        }
        else if (key === 'maxaperturevalue') {
            var apMatch = value.match(/([\d.]+)/);
            if (apMatch) exif.lens.aperture = parseFloat(apMatch[1]);
        }
        else if (key === 'lensmake') exif.lens.make = value;
        else if (key === 'lensmodel' || key === 'lens') exif.lens.model = value;

        else if (key === 'orientation') {
            var oriMatch = value.match(/(\d)/);
            if (oriMatch) exif.orientation = parseInt(oriMatch[1], 10);
        }
        else if (key === 'flash') exif.flash = value;
        else if (key === 'whitebalance') exif.whiteBalance = value;
        else if (key === 'meteringmode') exif.meteringMode = value;
    }

    var hasData = false;
    for (var section in exif) {
        if (typeof exif[section] === 'object') {
            for (var field in exif[section]) {
                if (exif[section][field] !== undefined) {
                    hasData = true;
                    break;
                }
            }
        } else if (exif[section] !== undefined) {
            hasData = true;
        }
        if (hasData) break;
    }

    return hasData ? exif : null;
}

function executeInfoOperation(imagePath, includeExif, timeout) {
    smartbotic.log.info('Running ImageMagick identify on: ' + imagePath);

    var identifyCmd = 'identify -verbose "' + imagePath.replace(/"/g, '\\"') + '"';
    var identifyResult = smartbotic.process.exec(identifyCmd, { timeout: timeout });

    if (!identifyResult.success) {
        throw new Error('ImageMagick identify failed: ' + (identifyResult.stderr || 'Unknown error'));
    }

    var info = parseImageMagickInfo(identifyResult.stdout);

    var stat = smartbotic.fs.stat(imagePath);
    if (stat.success && !info.fileSize) {
        info.fileSize = stat.size;
    }

    if (includeExif) {
        smartbotic.log.info('Extracting EXIF metadata');
        var exiftoolCmd = 'exiftool "' + imagePath.replace(/"/g, '\\"') + '"';
        var exifResult = smartbotic.process.exec(exiftoolCmd, { timeout: timeout });

        if (exifResult.success && exifResult.stdout) {
            var exifData = parseExifToolOutput(exifResult.stdout);
            if (exifData) {
                info.exif = exifData;
            }
        } else {
            smartbotic.log.debug('No EXIF data available or exiftool not installed');
        }
    }

    return info;
}

async function execute(config, input, context) {
    var operation = config.operation || 'info';
    var timeout = config.timeout || 30000;

    if (operation !== 'info') {
        throw new Error('Operation "' + operation + '" is not yet implemented. Only "info" is available in this version.');
    }

    var imageInput = resolveImageInput(config, input);

    if (!imageInput.type) {
        throw new Error('No valid image input found. Provide base64 data, file path, URL, or storage reference.');
    }

    smartbotic.log.info('Image input source: ' + imageInput.type);

    var fileInfo = null;
    try {
        fileInfo = prepareImageFile(imageInput, timeout);
        smartbotic.log.info('Processing image: ' + fileInfo.path);

        var result = executeInfoOperation(fileInfo.path, config.includeExif !== false, timeout);

        result.sourceType = imageInput.type;
        result.sourcePath = fileInfo.path;

        return result;
    } finally {
        if (fileInfo && fileInfo.tempPath) {
            cleanupTempFile(fileInfo.tempPath);
        }
    }
}

module.exports = { configSchema, inputSchema, outputSchema, execute };