/**
 * Format commit message with emoji based on content
 * @param {string} message - Commit message
 * @param {Object} stats - Commit stats
 * @returns {string} - Emoji for the commit
 */
const getCommitEmoji = (message, stats) => {
    const msg = message.toLowerCase()
    if (msg.includes('merge')) return '📎'
    if (msg.includes('fix')) return '🔧'
    if (msg.includes('feat')) return '✨'
    if (msg.includes('break')) return '💥'
    if (msg.includes('docs')) return '📚'
    if (msg.includes('test')) return '🧪'
    if (msg.includes('refactor')) return '♻️'
    if (stats.additions > 100 || stats.deletions > 100) return '🔨'
    return '📝'
}

/**
 * Format commit stats
 * @param {Object} stats - Commit stats object
 * @returns {string} - Formatted stats string or empty string if no changes
 */
const formatStats = (stats = { additions: 0, deletions: 0 }) => {
    const { additions = 0, deletions = 0 } = stats
    if (additions === 0 && deletions === 0) return ''
    
    const parts = []
    if (additions > 0) parts.push(`+${additions}`)
    if (deletions > 0) parts.push(`-${deletions}`)
    
    return parts.length ? `\`${parts.join('/')}\`` : ''
}

/**
 * Format commit message for Telegram
 * @param {Object} commit - Commit object
 * @param {string} repoUrl - Repository URL
 * @returns {string} - Formatted commit message
 */
const formatCommit = (commit, repoUrl) => {
    const commitUrl = `${repoUrl}/commit/${commit.id}`
    const emoji = getCommitEmoji(commit.message, commit.stats || {})
    const stats = formatStats(commit.stats)
    return `${emoji} [${commit.id.substring(0, 7)}](${commitUrl}): ${commit.message}${stats ? ' ' + stats : ''}`
}

/**
 * Format webhook message for Telegram
 * @param {Object} data - Webhook payload
 * @param {Array} commits - Filtered commits
 * @returns {string} - Formatted message
 */
const formatMessage = (data, commits) => {
    const repoUrl = data.repository.html_url || data.repository.url
    // const repoName = data.repository.full_name
    const repoId = data.repository.id
    const branch = data.ref.split('/').pop()
    const branchUrl = `${repoUrl}/tree/${branch}`

    const totalStats = commits.reduce((acc, commit) => ({
        additions: acc.additions + (commit.stats?.additions || 0),
        deletions: acc.deletions + (commit.stats?.deletions || 0)
    }), { additions: 0, deletions: 0 })

    const stats = formatStats(totalStats)

    return [
        `🔄 [${repoId}](${repoUrl}):[${branch}](${branchUrl}) ${commits.length} new commit${Array.from(commits.length.toString()).pop() === '1' ? '' : 's'}`,
        stats && commits.length > 1 ? `📊 ${stats}` : '',
        commits.map(commit => formatCommit(commit, repoUrl)).join('\n')
    ].filter(Boolean).join('\n')
}

module.exports = {
    formatMessage,
    formatCommit,
    formatStats,
    getCommitEmoji
}