class ArgumentBuilder {
    constructor() {
        this.arguments = [];
        this.container = document.getElementById('arguments-container');
        this.headerInput = document.getElementById('custom-header');
        this.generateBtn = document.getElementById('generate-btn');
        this.helpContent = document.getElementById('help-content');
        this.outputSection = document.getElementById('output-section');
        this.generatedCode = document.getElementById('generated-code');
        this.copyBtn = document.getElementById('copy-btn');

        this.init();
    }

    init() {
        // Add initial empty row
        this.addArgumentRow();

        // Event listeners
        this.generateBtn.addEventListener('click', () => this.generateScript());
        this.headerInput.addEventListener('input', () => this.updateHelpPreview());
        this.copyBtn.addEventListener('click', () => this.copyToClipboard());

        // Update help preview initially
        this.updateHelpPreview();
    }

    addArgumentRow(params = '', command = '', helpText = '') {
        const row = document.createElement('div');
        row.className = 'argument-row';

        const paramsInput = document.createElement('input');
        paramsInput.type = 'text';
        paramsInput.placeholder = '-v --verbose';
        paramsInput.value = params;

        const commandInput = document.createElement('input');
        commandInput.type = 'text';
        commandInput.placeholder = 'verbose';
        commandInput.value = command;

        const helpTextInput = document.createElement('input');
        helpTextInput.type = 'text';
        helpTextInput.placeholder = 'Enable verbose output';
        helpTextInput.value = helpText;

        const removeBtn = document.createElement('button');
        removeBtn.className = 'remove-btn';
        removeBtn.innerHTML = '×';
        removeBtn.addEventListener('click', () => {
            row.remove();
            this.updateHelpPreview();
        });

        // Add input event listeners for real-time updates
        const updatePreview = () => {
            this.updateHelpPreview();
            // Add new empty row if this is the last row and has content
            const rows = this.container.querySelectorAll('.argument-row');
            const isLastRow = rows[rows.length - 1] === row;
            const hasContent = commandInput.value.trim() !== '';

            if (isLastRow && hasContent) {
                this.addArgumentRow();
            }
        };

        paramsInput.addEventListener('input', updatePreview);
        commandInput.addEventListener('input', updatePreview);
        helpTextInput.addEventListener('input', updatePreview);

        row.appendChild(paramsInput);
        row.appendChild(commandInput);
        row.appendChild(helpTextInput);
        row.appendChild(removeBtn);

        this.container.appendChild(row);
    }

    getArguments() {
        const rows = this.container.querySelectorAll('.argument-row');
        const args = [];

        rows.forEach(row => {
            const inputs = row.querySelectorAll('input');
            const params = inputs[0].value.trim();
            const command = inputs[1].value.trim();
            const helpText = inputs[2].value.trim();

            if (command) {
                args.push({
                    params: params || command,
                    command: command,
                    helpText: helpText || command
                });
            }
        });

        return args;
    }

    addSubcommand(name = '', description = '') {
        const subcommandSection = document.createElement('div');
        subcommandSection.className = 'subcommand-section';

        const header = this.createSubcommandHeader(name, description);
        const argsContainer = this.createArgumentsContainer();

        subcommandSection.appendChild(header);
        subcommandSection.appendChild(argsContainer);

        this.subcommandContainer.appendChild(subcommandSection);

        return subcommandSection;
    }

    updateHelpPreview() {
        const header = this.headerInput.value.trim();
        const args = this.getArguments();

        if (args.length === 0) {
            this.helpContent.textContent = 'Add arguments to see the help output...';
            return;
        }

        let helpText = '';

        if (header) {
            helpText += header + '\n\n';
        }

        helpText += 'Usage: script.sh [OPTIONS]\n\n';
        helpText += 'Options:\n';

        args.forEach(arg => {
            const params = arg.params || arg.command;
            const help = arg.helpText || arg.command;
            helpText += `    ${params.padEnd(20)} ${help}\n`;
        });

        helpText += `    ${'-h --help'.padEnd(20)} Show this help message\n`;

        this.helpContent.textContent = helpText;
    }
    createSubcommandHeader(name, description) {
        const header = document.createElement('div');
        header.className = 'subcommand-header';
        header.innerHTML = `
            <input type="text" class="subcommand-name"
                   placeholder="container" value="${name}">
            <input type="text" class="subcommand-desc"
                   placeholder="Manage containers" value="${description}">
            <button class="toggle-btn">▼</button>
            <button class="remove-btn">×</button>
        `;
        return header;
    }

    getSubcommands() {
        const sections = this.subcommandContainer.querySelectorAll('.subcommand-section');
        return Array.from(sections).map(section => {
            const nameInput = section.querySelector('.subcommand-name');
            const descInput = section.querySelector('.subcommand-desc');
            const args = this.getArgumentsFromSection(section);

            return {
                name: nameInput.value.trim(),
                description: descInput.value.trim(),
                arguments: args
            };
        }).filter(sc => sc.name);
    }

    async generateScript() {
        const header = this.headerInput.value.trim();
        const args = this.getArguments();

        if (args.length === 0) {
            alert('Please add at least one argument');
            return;
        }

        const payload = {
            header: this.headerInput.value.trim(),
            arguments: this.getArguments(),
            subcommands: this.getSubcommands()
        };

        try {
            const response = await fetch('/generate', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify(payload)
            });

            if (!response.ok) {
                throw new Error('Failed to generate script');
            }

            const scriptCode = await response.text();
            this.generatedCode.textContent = scriptCode;
            this.outputSection.style.display = 'block';

            // Smooth scroll to output
            this.outputSection.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
        } catch (error) {
            alert('Error generating script: ' + error.message);
        }
    }

    async copyToClipboard() {
        const code = this.generatedCode.textContent;

        try {
            await navigator.clipboard.writeText(code);
            this.copyBtn.textContent = 'Copied!';
            this.copyBtn.classList.add('copied');

            setTimeout(() => {
                this.copyBtn.textContent = 'Copy';
                this.copyBtn.classList.remove('copied');
            }, 2000);
        } catch (error) {
            alert('Failed to copy to clipboard');
        }
    }
}

// Initialize the application when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
    new ArgumentBuilder();
});