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* Discord Webhook Sender\n * A simple, self-contained module for sending messages and embeds to Discord webhooks.\n * Handles message chunking, embed limits, and rate limiting gracefully.\n */\n\nimport { fetch } from \"https://esm.town/v/std/fetch\";\n\n// ============================================================================\n// Configuration\n// ============================================================================\n\n/** Environment variable name for default webhook URL */\nconst DEFAULT_WEBHOOK_ENV = \"DISCORD_WEBHOOK_URL\";\n\n// ============================================================================\n// Types\n// ============================================================================\n\nexport interface EmbedField {\n name: string;\n value: string;\n inline?: boolean;\n}\n\nexport interface EmbedAuthor {\n name: string;\n url?: string;\n icon_url?: string;\n}\n\nexport interface EmbedFooter {\n text: string;\n icon_url?: string;\n}\n\nexport interface Embed {\n title?: string;\n description?: string;\n url?: string;\n timestamp?: string;\n color?: number;\n footer?: EmbedFooter;\n image?: { url: string };\n thumbnail?: { url: string };\n author?: EmbedAuthor;\n fields?: EmbedField[];\n}\n\nexport interface WebhookOptions {\n username?: string;\n avatar_url?: string;\n content?: string;\n}\n\nexport interface SendResult {\n success: boolean;\n messagesSent?: number;\n error?: string;\n}\n\n// ============================================================================\n// Discord API Limits\n// ============================================================================\n\nconst LIMITS = {\n contentLength: 2000,\n title: 256,\n description: 4096,\n fields: 25,\n fieldName: 256,\n fieldValue: 1024,\n footerText: 2048,\n authorName: 256,\n totalEmbedCharacters: 6000,\n embedsPerMessage: 10,\n};\n\n// ============================================================================\n// Utility Functions\n// ============================================================================\n\nfunction truncate(text: string | undefined, limit: number): string | undefined {\n if (!text) return undefined;\n return text.length <= limit ? text : text.substring(0, limit - 3) + \"...\";\n}\n\nfunction delay(ms: number): Promise {\n return new Promise((resolve) => setTimeout(resolve, ms));\n}\n\n// ============================================================================\n// Message Chunking\n// ============================================================================\n\nfunction splitMessage(message: string): string[] {\n if (!message) return [];\n if (message.length <= LIMITS.contentLength) return [message];\n\n const chunks: string[] = [];\n let position = 0;\n\n while (position < message.length) {\n let end = Math.min(position + LIMITS.contentLength, message.length);\n\n // Find a good break point (newline or space)\n if (end < message.length) {\n const lastNewline = message.lastIndexOf(\"\\n\", end);\n if (lastNewline > position + LIMITS.contentLength / 2) {\n end = lastNewline + 1;\n } else {\n const lastSpace = message.lastIndexOf(\" \", end);\n if (lastSpace > position + LIMITS.contentLength / 2) {\n end = lastSpace + 1;\n }\n }\n }\n\n chunks.push(message.slice(position, end));\n position = end;\n }\n\n return chunks;\n}\n\n// ============================================================================\n// Embed Processing\n// ============================================================================\n\nfunction calculateEmbedSize(embed: Embed): number {\n let size = 0;\n if (embed.title) size += embed.title.length;\n if (embed.description) size += embed.description.length;\n if (embed.footer?.text) size += embed.footer.text.length;\n if (embed.author?.name) size += embed.author.name.length;\n if (embed.fields) {\n for (const field of embed.fields) {\n size += field.name.length + field.value.length;\n }\n }\n return size;\n}\n\nfunction sanitizeEmbed(embed: Embed): Embed {\n const sanitized: Embed = {};\n\n if (embed.title) sanitized.title = truncate(embed.title, LIMITS.title);\n if (embed.description) {\n sanitized.description = truncate(embed.description, LIMITS.description);\n }\n if (embed.url) sanitized.url = embed.url;\n if (embed.timestamp) sanitized.timestamp = embed.timestamp;\n if (embed.color !== undefined) sanitized.color = embed.color;\n\n if (embed.author) {\n sanitized.author = {\n name: truncate(embed.author.name, LIMITS.authorName) || \"\",\n url: embed.author.url,\n icon_url: embed.author.icon_url,\n };\n }\n\n if (embed.footer) {\n sanitized.footer = {\n text: truncate(embed.footer.text, LIMITS.footerText) || \"\",\n icon_url: embed.footer.icon_url,\n };\n }\n\n if (embed.image) sanitized.image = { url: embed.image.url };\n if (embed.thumbnail) sanitized.thumbnail = { url: embed.thumbnail.url };\n\n if (embed.fields?.length) {\n sanitized.fields = embed.fields.slice(0, LIMITS.fields).map((field) => ({\n name: truncate(field.name, LIMITS.fieldName) || \"\\u200B\",\n value: truncate(field.value, LIMITS.fieldValue) || \"\\u200B\",\n inline: field.inline,\n }));\n }\n\n return sanitized;\n}\n\nfunction chunkEmbeds(embeds: Embed[]): Embed[][] {\n if (embeds.length === 0) return [];\n\n const chunks: Embed[][] = [];\n let currentChunk: Embed[] = [];\n let currentSize = 0;\n\n for (const embed of embeds) {\n const sanitized = sanitizeEmbed(embed);\n const size = calculateEmbedSize(sanitized);\n\n const wouldExceedLimit = currentChunk.length >= LIMITS.embedsPerMessage ||\n (currentSize + size > LIMITS.totalEmbedCharacters &&\n currentChunk.length > 0);\n\n if (wouldExceedLimit) {\n chunks.push(currentChunk);\n currentChunk = [sanitized];\n currentSize = size;\n } else {\n currentChunk.push(sanitized);\n currentSize += size;\n }\n }\n\n if (currentChunk.length > 0) {\n chunks.push(currentChunk);\n }\n\n return chunks;\n}\n\n// ============================================================================\n// Discord API\n// ============================================================================\n\ninterface ApiResult {\n success: boolean;\n status?: number;\n error?: string;\n retryAfter?: number;\n}\n\nasync function sendToDiscord(\n webhookUrl: string,\n payload: {\n content?: string;\n embeds?: Embed[];\n username?: string;\n avatar_url?: string;\n },\n): Promise {\n try {\n const response = await fetch(webhookUrl, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify(payload),\n });\n\n if (response.ok) {\n return { success: true };\n }\n\n // Handle rate limiting\n if (response.status === 429) {\n const retryAfter = parseFloat(response.headers.get(\"Retry-After\") || \"1\");\n return { success: false, status: 429, retryAfter, error: \"Rate limited\" };\n }\n\n const errorText = await response.text();\n return {\n success: false,\n status: response.status,\n error: errorText || `Discord API error (${response.status})`,\n };\n } catch (error) {\n return {\n success: false,\n error: error instanceof Error ? error.message : String(error),\n };\n }\n}\n\n// ============================================================================\n// Main Send Function\n// ============================================================================\n\n/**\n * Send a message or embed(s) to a Discord webhook.\n *\n * @param content - Text message string, single Embed, or array of Embeds\n * @param webhookUrl - Discord webhook URL (falls back to DISCORD_WEBHOOK_URL env var)\n * @param options - Optional username, avatar, or content to accompany embeds\n *\n * @example\n * // Send a simple message\n * await send(\"Hello, Discord!\");\n *\n * @example\n * // Send an embed\n * await send({ title: \"Alert\", description: \"Something happened\", color: 0xff0000 });\n *\n * @example\n * // Send with custom username\n * await send(\"Hello!\", webhookUrl, { username: \"My Bot\" });\n */\nexport async function send(\n content: string | Embed | Embed[],\n webhookUrl?: string,\n options: WebhookOptions = {},\n): Promise {\n const url = webhookUrl || Deno.env.get(DEFAULT_WEBHOOK_ENV);\n if (!url) {\n return { success: false, error: \"No webhook URL provided\" };\n }\n\n const isEmbed = typeof content !== \"string\";\n\n if (isEmbed) {\n return sendEmbeds(\n Array.isArray(content) ? content : [content],\n url,\n options,\n );\n } else {\n return sendText(content, url, options);\n }\n}\n\nasync function sendText(\n message: string,\n webhookUrl: string,\n options: WebhookOptions,\n): Promise {\n const chunks = splitMessage(message);\n if (chunks.length === 0) {\n return { success: true, messagesSent: 0 };\n }\n\n let sent = 0;\n\n for (let i = 0; i < chunks.length; i++) {\n const payload = {\n content: chunks[i],\n username: options.username,\n avatar_url: options.avatar_url,\n };\n\n const result = await sendToDiscord(webhookUrl, payload);\n\n if (result.success) {\n sent++;\n } else if (result.status === 429 && result.retryAfter) {\n // Wait and retry once on rate limit\n await delay(result.retryAfter * 1000);\n const retry = await sendToDiscord(webhookUrl, payload);\n if (retry.success) sent++;\n else return { success: false, messagesSent: sent, error: retry.error };\n } else {\n return { success: false, messagesSent: sent, error: result.error };\n }\n\n // Small delay between chunks to avoid rate limits\n if (i < chunks.length - 1) {\n await delay(250);\n }\n }\n\n return { success: true, messagesSent: sent };\n}\n\nasync function sendEmbeds(\n embeds: Embed[],\n webhookUrl: string,\n options: WebhookOptions,\n): Promise {\n const chunks = chunkEmbeds(embeds);\n if (chunks.length === 0) {\n return { success: true, messagesSent: 0 };\n }\n\n let sent = 0;\n\n for (let i = 0; i < chunks.length; i++) {\n const payload = {\n embeds: chunks[i],\n content: i === 0\n ? options.content?.slice(0, LIMITS.contentLength)\n : undefined,\n username: options.username,\n avatar_url: options.avatar_url,\n };\n\n const result = await sendToDiscord(webhookUrl, payload);\n\n if (result.success) {\n sent++;\n } else if (result.status === 429 && result.retryAfter) {\n await delay(result.retryAfter * 1000);\n const retry = await sendToDiscord(webhookUrl, payload);\n if (retry.success) sent++;\n else return { success: false, messagesSent: sent, error: retry.error };\n } else {\n return { success: false, messagesSent: sent, error: result.error };\n }\n\n if (i < chunks.length - 1) {\n await delay(250);\n }\n }\n\n return { success: true, messagesSent: sent };\n}\n\n// ============================================================================\n// Embed Factory Helpers\n// ============================================================================\n\n/** Create a basic embed */\nexport function createEmbed(\n title?: string,\n description?: string,\n color?: number,\n): Embed {\n const embed: Embed = {};\n if (title) embed.title = title;\n if (description) embed.description = description;\n if (color !== undefined) embed.color = color;\n return embed;\n}\n\n/** Create an error embed (red) */\nexport function createErrorEmbed(\n title: string,\n error: string | Error,\n fields?: EmbedField[],\n): Embed {\n return {\n title: `❌ ${title}`,\n description: error instanceof Error ? error.message : error,\n color: 0xff0000,\n fields,\n timestamp: new Date().toISOString(),\n };\n}\n\n/** Create a success embed (green) */\nexport function createSuccessEmbed(\n title: string,\n description?: string,\n fields?: EmbedField[],\n): Embed {\n return {\n title: `✅ ${title}`,\n description,\n color: 0x00ff00,\n fields,\n timestamp: new Date().toISOString(),\n };\n}\n\n/** Create an info embed (blue) */\nexport function createInfoEmbed(\n title: string,\n description?: string,\n fields?: EmbedField[],\n): Embed {\n return {\n title: `ℹ️ ${title}`,\n description,\n color: 0x0099ff,\n 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