import * as fs from "node:fs/promises";
import { command, flag } from "cmd-ts";
import { select, spinner, log } from "@clack/prompts";
import * as path from "node:path";
import { loadConfig, loadState, saveState, findConfig } from "../lib/config";
import {
	loadCredentials,
	listCredentials,
	getCredentials,
} from "../lib/credentials";
import {
	createAgent,
	createDocument,
	updateDocument,
	uploadImage,
	resolveImagePath,
	createBlueskyPost,
	addBskyPostRefToDocument,
} from "../lib/atproto";
import {
	scanContentDirectory,
	getContentHash,
	updateFrontmatterWithAtUri,
} from "../lib/markdown";
import type { BlogPost, BlobObject, StrongRef } from "../lib/types";
import { exitOnCancel } from "../lib/prompts";

export const publishCommand = command({
	name: "publish",
	description: "Publish content to ATProto",
	args: {
		force: flag({
			long: "force",
			short: "f",
			description: "Force publish all posts, ignoring change detection",
		}),
		dryRun: flag({
			long: "dry-run",
			short: "n",
			description: "Preview what would be published without making changes",
		}),
	},
	handler: async ({ force, dryRun }) => {
		// Load config
		const configPath = await findConfig();
		if (!configPath) {
			log.error("No publisher.config.ts found. Run 'publisher init' first.");
			process.exit(1);
		}

		const config = await loadConfig(configPath);
		const configDir = path.dirname(configPath);

		log.info(`Site: ${config.siteUrl}`);
		log.info(`Content directory: ${config.contentDir}`);

		// Load credentials
		let credentials = await loadCredentials(config.identity);

		// If no credentials resolved, check if we need to prompt for identity selection
		if (!credentials) {
			const identities = await listCredentials();
			if (identities.length === 0) {
				log.error("No credentials found. Run 'sequoia auth' first.");
				log.info(
					"Or set ATP_IDENTIFIER and ATP_APP_PASSWORD environment variables.",
				);
				process.exit(1);
			}

			// Multiple identities exist but none selected - prompt user
			log.info("Multiple identities found. Select one to use:");
			const selected = exitOnCancel(
				await select({
					message: "Identity:",
					options: identities.map((id) => ({ value: id, label: id })),
				}),
			);

			credentials = await getCredentials(selected);
			if (!credentials) {
				log.error("Failed to load selected credentials.");
				process.exit(1);
			}

			log.info(
				`Tip: Add "identity": "${selected}" to sequoia.json to use this by default.`,
			);
		}

		// Resolve content directory
		const contentDir = path.isAbsolute(config.contentDir)
			? config.contentDir
			: path.join(configDir, config.contentDir);

		const imagesDir = config.imagesDir
			? path.isAbsolute(config.imagesDir)
				? config.imagesDir
				: path.join(configDir, config.imagesDir)
			: undefined;

		// Load state
		const state = await loadState(configDir);

		// Scan for posts
		const s = spinner();
		s.start("Scanning for posts...");
		const posts = await scanContentDirectory(contentDir, {
			frontmatterMapping: config.frontmatter,
			ignorePatterns: config.ignore,
			slugField: config.frontmatter?.slugField,
			removeIndexFromSlug: config.removeIndexFromSlug,
			stripDatePrefix: config.stripDatePrefix,
		});
		s.stop(`Found ${posts.length} posts`);

		// Determine which posts need publishing
		const postsToPublish: Array<{
			post: BlogPost;
			action: "create" | "update";
			reason: string;
		}> = [];
		const draftPosts: BlogPost[] = [];

		for (const post of posts) {
			// Skip draft posts
			if (post.frontmatter.draft) {
				draftPosts.push(post);
				continue;
			}

			const contentHash = await getContentHash(post.rawContent);
			const relativeFilePath = path.relative(configDir, post.filePath);
			const postState = state.posts[relativeFilePath];

			if (force) {
				postsToPublish.push({
					post,
					action: post.frontmatter.atUri ? "update" : "create",
					reason: "forced",
				});
			} else if (!postState) {
				// New post
				postsToPublish.push({
					post,
					action: "create",
					reason: "new post",
				});
			} else if (postState.contentHash !== contentHash) {
				// Changed post
				postsToPublish.push({
					post,
					action: post.frontmatter.atUri ? "update" : "create",
					reason: "content changed",
				});
			}
		}

		if (draftPosts.length > 0) {
			log.info(
				`Skipping ${draftPosts.length} draft post${draftPosts.length === 1 ? "" : "s"}`,
			);
		}

		if (postsToPublish.length === 0) {
			log.success("All posts are up to date. Nothing to publish.");
			return;
		}

		log.info(`\n${postsToPublish.length} posts to publish:\n`);

		// Bluesky posting configuration
		const blueskyEnabled = config.bluesky?.enabled ?? false;
		const maxAgeDays = config.bluesky?.maxAgeDays ?? 7;
		const cutoffDate = new Date();
		cutoffDate.setDate(cutoffDate.getDate() - maxAgeDays);

		for (const { post, action, reason } of postsToPublish) {
			const icon = action === "create" ? "+" : "~";
			const relativeFilePath = path.relative(configDir, post.filePath);
			const existingBskyPostRef = state.posts[relativeFilePath]?.bskyPostRef;

			let bskyNote = "";
			if (blueskyEnabled) {
				if (existingBskyPostRef) {
					bskyNote = " [bsky: exists]";
				} else {
					const publishDate = new Date(post.frontmatter.publishDate);
					if (publishDate < cutoffDate) {
						bskyNote = ` [bsky: skipped, older than ${maxAgeDays} days]`;
					} else {
						bskyNote = " [bsky: will post]";
					}
				}
			}

			log.message(`  ${icon} ${post.frontmatter.title} (${reason})${bskyNote}`);
		}

		if (dryRun) {
			if (blueskyEnabled) {
				log.info(`\nBluesky posting: enabled (max age: ${maxAgeDays} days)`);
			}
			log.info("\nDry run complete. No changes made.");
			return;
		}

		// Create agent
		s.start(`Connecting to ${credentials.pdsUrl}...`);
		let agent: Awaited<ReturnType<typeof createAgent>> | undefined;
		try {
			agent = await createAgent(credentials);
			s.stop(`Logged in as ${agent.did}`);
		} catch (error) {
			s.stop("Failed to login");
			log.error(`Failed to login: ${error}`);
			process.exit(1);
		}

		// Publish posts
		let publishedCount = 0;
		let updatedCount = 0;
		let errorCount = 0;
		let bskyPostCount = 0;

		for (const { post, action } of postsToPublish) {
			s.start(`Publishing: ${post.frontmatter.title}`);

			try {
				// Handle cover image upload
				let coverImage: BlobObject | undefined;
				if (post.frontmatter.ogImage) {
					const imagePath = await resolveImagePath(
						post.frontmatter.ogImage,
						imagesDir,
						contentDir,
					);

					if (imagePath) {
						log.info(`  Uploading cover image: ${path.basename(imagePath)}`);
						coverImage = await uploadImage(agent, imagePath);
						if (coverImage) {
							log.info(`  Uploaded image blob: ${coverImage.ref.$link}`);
						}
					} else {
						log.warn(`  Cover image not found: ${post.frontmatter.ogImage}`);
					}
				}

				// Track atUri, content for state saving, and bskyPostRef
				let atUri: string;
				let contentForHash: string;
				let bskyPostRef: StrongRef | undefined;
				const relativeFilePath = path.relative(configDir, post.filePath);

				// Check if bskyPostRef already exists in state
				const existingBskyPostRef = state.posts[relativeFilePath]?.bskyPostRef;

				if (action === "create") {
					atUri = await createDocument(agent, post, config, coverImage);
					s.stop(`Created: ${atUri}`);

					// Update frontmatter with atUri
					const updatedContent = updateFrontmatterWithAtUri(
						post.rawContent,
						atUri,
					);
					await fs.writeFile(post.filePath, updatedContent);
					log.info(`  Updated frontmatter in ${path.basename(post.filePath)}`);

					// Use updated content (with atUri) for hash so next run sees matching hash
					contentForHash = updatedContent;
					publishedCount++;
				} else {
					atUri = post.frontmatter.atUri!;
					await updateDocument(agent, post, atUri, config, coverImage);
					s.stop(`Updated: ${atUri}`);

					// For updates, rawContent already has atUri
					contentForHash = post.rawContent;
					updatedCount++;
				}

				// Create Bluesky post if enabled and conditions are met
				if (blueskyEnabled) {
					if (existingBskyPostRef) {
						log.info(`  Bluesky post already exists, skipping`);
						bskyPostRef = existingBskyPostRef;
					} else {
						const publishDate = new Date(post.frontmatter.publishDate);

						if (publishDate < cutoffDate) {
							log.info(
								`  Post is older than ${maxAgeDays} days, skipping Bluesky post`,
							);
						} else {
							// Create Bluesky post
							try {
								const pathPrefix = config.pathPrefix || "/posts";
								const canonicalUrl = `${config.siteUrl}${pathPrefix}/${post.slug}`;

								bskyPostRef = await createBlueskyPost(agent, {
									title: post.frontmatter.title,
									description: post.frontmatter.description,
									canonicalUrl,
									coverImage,
									publishedAt: post.frontmatter.publishDate,
								});

								// Update document record with bskyPostRef
								await addBskyPostRefToDocument(agent, atUri, bskyPostRef);
								log.info(`  Created Bluesky post: ${bskyPostRef.uri}`);
								bskyPostCount++;
							} catch (bskyError) {
								const errorMsg =
									bskyError instanceof Error
										? bskyError.message
										: String(bskyError);
								log.warn(`  Failed to create Bluesky post: ${errorMsg}`);
							}
						}
					}
				}

				// Update state (use relative path from config directory)
				const contentHash = await getContentHash(contentForHash);
				state.posts[relativeFilePath] = {
					contentHash,
					atUri,
					lastPublished: new Date().toISOString(),
					slug: post.slug,
					bskyPostRef,
				};
			} catch (error) {
				const errorMessage =
					error instanceof Error ? error.message : String(error);
				s.stop(`Error publishing "${path.basename(post.filePath)}"`);
				log.error(`  ${errorMessage}`);
				errorCount++;
			}
		}

		// Save state
		await saveState(configDir, state);

		// Summary
		log.message("\n---");
		log.info(`Published: ${publishedCount}`);
		log.info(`Updated: ${updatedCount}`);
		if (bskyPostCount > 0) {
			log.info(`Bluesky posts: ${bskyPostCount}`);
		}
		if (errorCount > 0) {
			log.warn(`Errors: ${errorCount}`);
		}
	},
});