/**
 * @file ae_journals_export_templates.ts
 * @description Templates for formatting journal entries during export.
 * @author One Sky IT
 */

import { ae_util } from '$lib/ae_utils/ae_utils';
import type { ae_JournalEntry } from '$lib/types/ae_types';

export interface ExportTemplate {
    id: string;
    name: string;
    description: string;
    extension: string;
    formatter: (entries: ae_JournalEntry[]) => string;
}

/**
 * Standard Markdown Template
 */
export const template_standard_markdown: ExportTemplate = {
    id: 'standard_markdown',
    name: 'Standard Markdown',
    description: 'Basic Markdown with title, date, and content.',
    extension: 'md',
    formatter: (entries) => {
        return entries
            .map((entry) => {
                const dateStr = ae_util.iso_datetime_formatter(
                    entry.created_on,
                    'datetime_12_long'
                );
                const title = entry.name || dateStr;
                const header = `# ${title}\n*${dateStr}*\n\n`;
                return `${header}${entry.content || ''}\n\n---\n`;
            })
            .join('\n');
    }
};

/**
 * Personal Log Template
 * Formats entries as a continuous daily log.
 */
export const template_personal_log: ExportTemplate = {
    id: 'personal_log',
    name: 'Personal Log',
    description: 'Formatted as a daily log with ## Date headers.',
    extension: 'md',
    formatter: (entries) => {
        // Sort entries by date ascending for a chronological log
        const sorted = [...entries].sort((a, b) => {
            const dateA = a.created_on ? String(a.created_on) : '';
            const dateB = b.created_on ? String(b.created_on) : '';
            return dateA.localeCompare(dateB);
        });

        return sorted
            .map((entry) => {
                const dateStr = ae_util.iso_datetime_formatter(
                    entry.created_on,
                    'date_iso'
                );
                const title = entry.name || '';
                const header = `## ${dateStr}${title ? ' - ' + title : ''}\n\n`;
                return `${header}${entry.content || ''}\n\n`;
            })
            .join('\n');
    }
};

/**
 * Amazon Vine Template
 * Specific formatting for product reviews.
 */
export const template_amazon_vine: ExportTemplate = {
    id: 'amazon_vine',
    name: 'Amazon Vine',
    description: 'Optimized for product reviews.',
    extension: 'md',
    formatter: (entries) => {
        return entries
            .map((entry) => {
                const dateStr = ae_util.iso_datetime_formatter(
                    entry.created_on,
                    'date_iso'
                );
                // Try to find a product name in the title or content
                const productName = entry.name || 'Unknown Product';

                // Look for product link in content_json or tags if available,
                // otherwise just output content
                let output = `## ${productName}\n`;
                output += `*Date: ${dateStr}*\n\n`;
                output += `${entry.content || ''}\n\n`;
                output += `---`;
                return output;
            })
            .join('\n\n');
    }
};

/**
 * Standard HTML Template
 */
export const template_standard_html: ExportTemplate = {
    id: 'standard_html',
    name: 'Standard HTML',
    description: 'Semantic HTML5 articles.',
    extension: 'html',
    formatter: (entries) => {
        const body = entries
            .map((entry) => {
                const dateStr = ae_util.iso_datetime_formatter(
                    entry.created_on,
                    'datetime_12_long'
                );
                const title = entry.name || dateStr;
                return `
<article class="journal-entry" id="entry-${entry.journal_entry_id}">
    <header>
        <h1>${title}</h1>
        <time datetime="${String(entry.created_on)}">${dateStr}</time>
    </header>
    <div class="content">
        ${entry.content_md_html || ''}
    </div>
    <hr/>
</article>`;
            })
            .join('\n');

        return `<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Journal Export</title>
    <style>
        body { font-family: sans-serif; max-width: 800px; margin: 2rem auto; padding: 0 1rem; line-height: 1.6; }
        article { margin-bottom: 3rem; }
        header { border-bottom: 1px solid #eee; margin-bottom: 1rem; }
        h1 { margin-bottom: 0.2rem; }
        time { color: #666; font-size: 0.9rem; }
        hr { border: 0; border-top: 1px solid #eee; margin: 2rem 0; }
    </style>
</head>
<body>
    ${body}
</body>
</html>`;
    }
};

/**
 * Standard JSON Template
 */
export const template_standard_json: ExportTemplate = {
    id: 'standard_json',
    name: 'Raw JSON',
    description: 'Full database dump of selected entries.',
    extension: 'json',
    formatter: (entries) => JSON.stringify(entries, null, 2)
};

export const EXPORT_TEMPLATES = {
    standard_markdown: template_standard_markdown,
    personal_log: template_personal_log,
    amazon_vine: template_amazon_vine,
    standard_html: template_standard_html,
    standard_json: template_standard_json
};