/**
 * INI-style Config Parser for NAD/Weight/Dimension lookup tables
 * All section lookups are case-insensitive
 */
window.EDIBridge = window.EDIBridge || {};

class ConfigParser {
    static parse(text) {
        const config = {};
        const sectionMap = {};
        let currentSection = null;

        const lines = text.split(/\r?\n/);
        for (const line of lines) {
            const trimmed = line.trim();
            if (!trimmed || trimmed.startsWith(';')) continue;

            const sectionMatch = trimmed.match(/^\[(.+)\]$/);
            if (sectionMatch) {
                currentSection = sectionMatch[1];
                config[currentSection] = config[currentSection] || {};
                sectionMap[currentSection.toUpperCase()] = currentSection;
                continue;
            }

            if (currentSection) {
                const eqIdx = trimmed.indexOf('=');
                if (eqIdx > 0) {
                    const key = trimmed.substring(0, eqIdx).trim();
                    const value = trimmed.substring(eqIdx + 1).trim();
                    config[currentSection][key] = value;
                }
            }
        }

        config.__sectionMap__ = sectionMap;
        return config;
    }

    /** Case-insensitive section lookup */
    static getSection(config, name) {
        if (config[name]) return config[name];
        const map = config.__sectionMap__ || {};
        const realName = map[name.toUpperCase()];
        if (realName && config[realName]) return config[realName];
        return null;
    }

    /** Ensure a section exists, create if missing */
    static ensureSection(config, name) {
        if (!config[name]) {
            config[name] = {};
            if (!config.__sectionMap__) config.__sectionMap__ = {};
            config.__sectionMap__[name.toUpperCase()] = name;
        }
        return config[name];
    }

    /** Find value trying multiple ID variations */
    static findInSection(config, sectionName, plantId) {
        const section = this.getSection(config, sectionName);
        if (!section) return '';
        const ids = [
            plantId,
            plantId.replace(/^0+/, ''),
            plantId.padStart(10, '0'),
            plantId.padStart(9, '0'),
            plantId.padStart(8, '0'),
            plantId.padStart(7, '0')
        ];
        for (const id of ids) {
            if (section[id] !== undefined) return section[id];
        }
        return '';
    }

    /** Look up NAD record */
    static lookupNAD(config, qualifier, plantId) {
        const q = qualifier.toUpperCase();
        return {
            id: this.findInSection(config, `NAD_${q}_PARTY`, plantId) ||
                this.findInSection(config, `NAD_${q}_Party`, plantId) || plantId,
            qual: this.findInSection(config, `NAD_${q}_QUAL`, plantId) ||
                this.findInSection(config, `NAD_${q}_Qual`, plantId) || '92',
            name: this.findInSection(config, `NAD_${q}_NAME`, plantId) ||
                this.findInSection(config, `NAD_${q}_Name`, plantId),
            name2: this.findInSection(config, `NAD_${q}_NAME2`, plantId) ||
                this.findInSection(config, `NAD_${q}_Name2`, plantId) ||
                this.findInSection(config, `NAD_${q}_Name_2`, plantId),
            street: this.findInSection(config, `NAD_${q}_STREET`, plantId) ||
                this.findInSection(config, `NAD_${q}_Street`, plantId),
            city: this.findInSection(config, `NAD_${q}_CITY`, plantId) ||
                this.findInSection(config, `NAD_${q}_City`, plantId),
            zip: this.findInSection(config, `NAD_${q}_POSTCODE`, plantId) ||
                this.findInSection(config, `NAD_${q}_Postcode`, plantId),
            country: this.findInSection(config, `NAD_${q}_COUNTRY`, plantId) ||
                this.findInSection(config, `NAD_${q}_Country`, plantId)
        };
    }

    static lookupPacWeight(config, packMatSupp) {
        const section = this.getSection(config, 'PAC_WEIGHT');
        if (!section) return 0;
        const val = section[packMatSupp] || section[packMatSupp.replace(/^0+/, '')];
        return val ? parseFloat(val) : 0;
    }

    static lookupPacDimension(config, packMatSupp, dim) {
        // dim = 'LENGTH', 'WIDTH', 'HEIGHT'
        const section = this.getSection(config, 'PAC_' + dim);
        if (!section) return 0;
        const val = section[packMatSupp] || section[packMatSupp.replace(/^0+/, '')];
        return val ? parseFloat(val) : 0;
    }

    static lookupLinWeight(config, suppMat) {
        const section = this.getSection(config, 'LIN_WEIGHT');
        if (!section) return 0;
        const val = section[suppMat] || section[suppMat.replace(/^0+/, '').replace(/ /g, '')];
        return val ? parseFloat(val) : 0;
    }

    static lookupRffAnk(config, sellerId) {
        const section = this.getSection(config, 'RFF_ANK_SE');
        if (!section) return '';
        const ids = [sellerId, sellerId.replace(/^0+/, ''), sellerId.padStart(10, '0')];
        for (const id of ids) {
            if (section[id]) return section[id];
        }
        return '';
    }

    static lookupGeneral(config, key, defaultValue = '') {
        const section = this.getSection(config, 'GENERAL');
        if (!section) return defaultValue;
        return section[key] || defaultValue;
    }

    static lookupCustomerMode(config, customerId) {
        const id = customerId.trim();

        if (config) {
            const section = this.getSection(config, 'CUSTOMER_MAPPING');
            if (section) {
                const mode = section[id] || section[id.replace(/^0+/, '')];
                if (mode) return mode;
            }
        }

        return null;
    }

    /** Serialize config object back to INI text */
    static serialize(config) {
        const lines = [];
        const skipKeys = new Set(['__sectionMap__']);

        for (const section of Object.keys(config)) {
            if (skipKeys.has(section)) continue;
            lines.push('');
            lines.push('[' + section + ']');
            const entries = config[section];
            for (const [key, value] of Object.entries(entries)) {
                lines.push(key + '=' + value);
            }
        }
        return lines.join('\r\n');
    }
}

window.EDIBridge.ConfigParser = ConfigParser;