"use node";

import { v } from "convex/values";
import { action } from "./_generated/server";
import { api } from "./_generated/api";
import FirecrawlApp from "@mendable/firecrawl-js";

/**
 * Generate a URL-safe slug from a title
 */
function generateSlug(title: string): string {
  return title
    .toLowerCase()
    .replace(/[^a-z0-9\s-]/g, "")
    .replace(/\s+/g, "-")
    .replace(/-+/g, "-")
    .replace(/^-|-$/g, "")
    .substring(0, 60);
}

/**
 * Clean up markdown content
 */
function cleanMarkdown(content: string): string {
  return content.replace(/^\s+|\s+$/g, "").replace(/\n{3,}/g, "\n\n");
}

/**
 * Calculate reading time from content
 */
function calculateReadTime(content: string): string {
  const wordsPerMinute = 200;
  const wordCount = content.split(/\s+/).length;
  const minutes = Math.ceil(wordCount / wordsPerMinute);
  return `${minutes} min read`;
}

/**
 * Import content from a URL using Firecrawl and save directly to database
 */
export const importFromUrl = action({
  args: {
    url: v.string(),
    published: v.optional(v.boolean()),
  },
  returns: v.object({
    success: v.boolean(),
    slug: v.optional(v.string()),
    title: v.optional(v.string()),
    error: v.optional(v.string()),
  }),
  handler: async (ctx, args) => {
    const apiKey = process.env.FIRECRAWL_API_KEY;
    if (!apiKey) {
      return {
        success: false,
        error:
          "FIRECRAWL_API_KEY not configured. Add it to your Convex environment variables.",
      };
    }

    try {
      const firecrawl = new FirecrawlApp({ apiKey });
      const result = await firecrawl.scrapeUrl(args.url, {
        formats: ["markdown"],
      });

      if (!result.success || !result.markdown) {
        return {
          success: false,
          error: result.error || "Failed to scrape URL - no content returned",
        };
      }

      const title = result.metadata?.title || "Imported Post";
      const description = result.metadata?.description || "";
      const content = cleanMarkdown(result.markdown);
      const baseSlug = generateSlug(title);
      const slug = baseSlug || `imported-${Date.now()}`;
      const today = new Date().toISOString().split("T")[0];

      // Add source attribution
      let hostname: string;
      try {
        hostname = new URL(args.url).hostname;
      } catch {
        hostname = "external source";
      }
      const contentWithAttribution = `${content}\n\n---\n\n*Originally published at [${hostname}](${args.url})*`;

      // Create post directly in database using the CMS mutation
      try {
        await ctx.runMutation(api.cms.createPost, {
          post: {
            slug,
            title,
            description,
            content: contentWithAttribution,
            date: today,
            published: args.published ?? false,
            tags: ["imported"],
            readTime: calculateReadTime(content),
          },
        });
      } catch (mutationError) {
        // Handle slug conflict by adding timestamp
        if (
          mutationError instanceof Error &&
          mutationError.message.includes("already exists")
        ) {
          const uniqueSlug = `${slug}-${Date.now()}`;
          await ctx.runMutation(api.cms.createPost, {
            post: {
              slug: uniqueSlug,
              title,
              description,
              content: contentWithAttribution,
              date: today,
              published: args.published ?? false,
              tags: ["imported"],
              readTime: calculateReadTime(content),
            },
          });
          return {
            success: true,
            slug: uniqueSlug,
            title,
          };
        }
        throw mutationError;
      }

      return {
        success: true,
        slug,
        title,
      };
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : "Unknown error occurred",
      };
    }
  },
});