/**
 * pi-gitea Extension — entry point
 *
 * Registers Gitea tools (read + write) and optional webhook server.
 * Supports @mention routing for multi-bot coordination.
 * Supports multi-session claim system for webhook ownership.
 */

import registerReadTools from "./tools/read-tools.js";
import registerWriteTools from "./tools/write-tools.js";
import {
	startWebhookServer, stopWebhookServer,
	startPolling, stopPolling,
	setSendMessage, getTrackedRepos, setRepoConfig,
	setOnClaimRequested, approvePendingClaim, getClaimStatus,
	SESSION_ID, WEBHOOK_PORT, WEBHOOK_HOST,
} from "./webhook/server.js";
import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
import { Type } from "@sinclair/typebox";

export default function (pi: ExtensionAPI) {
	registerReadTools(pi);
	registerWriteTools(pi);

	// ── Repo config tool ─────────────────────────────────────────────────────

	pi.registerTool({
		name: "gitea_repo_config",
		label: "Gitea: Configure Repo Response Mode",
		description:
			'Set how the bot responds to events on a repo. ' +
			'"all" = respond to every event. ' +
			'"mention" = respond only when @mentioned or assigned. ' +
			'Collab repos default to "mention", own repos default to "all".',
		parameters: Type.Object({
			repo: Type.String({ description: "Repository (owner/name)" }),
			respondTo: Type.String({ description: '"all" or "mention"' }),
		}),
		async execute(_id, params) {
			const mode = params.respondTo as "all" | "mention";
			if (mode !== "all" && mode !== "mention") {
				return {
					content: [{ type: "text", text: `Invalid mode "${params.respondTo}". Use "all" or "mention".` }],
				};
			}
			const config = setRepoConfig(params.repo, { respondTo: mode });
			return {
				content: [{ type: "text", text: `${params.repo}: respondTo = ${config.respondTo}` }],
				details: { repo: params.repo, config },
			};
		},
	});

	pi.registerTool({
		name: "gitea_tracked_repos",
		label: "Gitea: List Tracked Repos",
		description: "Show all tracked repos, their type (webhook/collab), and response mode.",
		parameters: Type.Object({}),
		async execute() {
			const { webhook, collab, configs } = getTrackedRepos();
			const lines: string[] = [];

			for (const [name] of webhook) {
				const mode = configs.get(name)?.respondTo ?? "all";
				lines.push(`${name} — webhook (respondTo: ${mode})`);
			}
			for (const name of collab) {
				const mode = configs.get(name)?.respondTo ?? "mention";
				lines.push(`${name} — collab/notification (respondTo: ${mode})`);
			}

			return {
				content: [{ type: "text", text: lines.length > 0 ? lines.join("\n") : "No repos tracked." }],
				details: { webhook: [...webhook.keys()], collab: [...collab], configs: Object.fromEntries(configs) },
			};
		},
	});

	// ── Webhook claim commands ───────────────────────────────────────────────

	pi.registerCommand("webhook:status", {
		description: "Show webhook server status and claim ownership",
		handler: async (_args, _ctx) => {
			const status = getClaimStatus();

			if (status.isOwner && status.pending.length === 0) {
				console.log(`Webhook: you own the server (session: ${status.sessionId})`);
				console.log(`  port: ${WEBHOOK_PORT}, cwd: ${status.ownerCwd}`);
			} else if (status.isOwner) {
				console.log(`Webhook: you own the server (session: ${status.sessionId})`);
				console.log(`  port: ${WEBHOOK_PORT}, cwd: ${status.ownerCwd}`);
				console.log(`  ${status.pending.length} pending claim(s):`);
				for (const c of status.pending) {
					const age = Math.round((Date.now() - c.createdAt) / 1000);
					console.log(`    ${c.referralId} from ${c.sessionId} (${c.cwd}) — ${age}s ago`);
				}
				console.log(`  Use /webhook:release to hand off to next in queue`);
			} else {
				// Not the server owner — query the server
				try {
					const res = await fetch(`http://127.0.0.1:${WEBHOOK_PORT}/claim`);
					if (res.ok) {
						const data = await res.json() as Record<string, unknown>;
						console.log(`Webhook: owned by another session`);
						console.log(`  owner: ${data.owner} (cwd: ${data.owner_cwd})`);
						console.log(`  server session: ${data.server_session}`);
						const pending = data.pending as Array<Record<string, unknown>>;
						if (pending?.length) {
							console.log(`  ${pending.length} pending claim(s)`);
						}
						console.log(`  Use /webhook:claim to request ownership`);
					} else {
						console.log(`Webhook: no server running on port ${WEBHOOK_PORT}`);
					}
				} catch {
					console.log(`Webhook: no server reachable on port ${WEBHOOK_PORT}`);
				}
			}
		},
	});

	pi.registerCommand("webhook:claim", {
		description: "Request webhook ownership from the current server owner",
		handler: async (_args, ctx) => {
			const status = getClaimStatus();

			if (status.isOwner) {
				console.log("You already own the webhook server.");
				return;
			}

			// POST to the running server's /claim endpoint
			const url = `http://127.0.0.1:${WEBHOOK_PORT}/claim`;
			let referralId: string | undefined;

			try {
				// Initial request
				const initRes = await fetch(url, {
					method: "POST",
					headers: { "Content-Type": "application/json" },
					body: JSON.stringify({ session_id: SESSION_ID, cwd: process.cwd() }),
				});

				if (initRes.status === 503) {
					console.log("Server has too many pending claims. Try again later.");
					return;
				}

				const initData = await initRes.json() as Record<string, unknown>;

				if (initRes.status === 200) {
					console.log("Claimed immediately (no contention).");
					return;
				}

				if (initRes.status !== 202) {
					console.log(`Unexpected response: ${initRes.status} ${JSON.stringify(initData)}`);
					return;
				}

				referralId = initData.referral_id as string;
				console.log(`Claim submitted (referral: ${referralId})`);
				console.log(`  Current owner: ${initData.owner} (${initData.owner_cwd})`);
				console.log(`  Queue position: ${initData.position}`);
				console.log(`  Waiting for owner to /webhook:release ...`);

				// Poll every 3s for up to 5 minutes
				const deadline = Date.now() + 5 * 60 * 1000;
				while (Date.now() < deadline) {
					await new Promise((r) => setTimeout(r, 3000));

					const pollRes = await fetch(url, {
						method: "POST",
						headers: { "Content-Type": "application/json" },
						body: JSON.stringify({ session_id: SESSION_ID, referral_id: referralId }),
					});

					if (pollRes.status === 200) {
						console.log("Claim approved — you now own the webhook server.");
						return;
					}
					if (pollRes.status === 401) {
						console.log("Claim denied by the current owner.");
						return;
					}
					if (pollRes.status === 408) {
						console.log("Claim expired (timed out).");
						return;
					}
					// 202 = still pending, continue polling
				}

				console.log("Claim timed out (client-side deadline).");
			} catch (err) {
				const msg = err instanceof Error ? err.message : String(err);
				if (msg.includes("ECONNREFUSED")) {
					console.log(`No webhook server running on port ${WEBHOOK_PORT}.`);
				} else {
					console.log(`Claim failed: ${msg}`);
				}
			}
		},
	});

	pi.registerCommand("webhook:release", {
		description: "Release webhook ownership to the next pending claimer",
		handler: async (_args, _ctx) => {
			const status = getClaimStatus();

			if (!status.isOwner) {
				console.log("You don't own the webhook server — nothing to release.");
				return;
			}

			if (status.pending.length === 0) {
				console.log("No pending claims to hand off to.");
				return;
			}

			const { approved, newOwner } = approvePendingClaim();
			if (approved) {
				console.log(`Ownership transferred to ${approved.sessionId} (${approved.cwd})`);
				console.log(`New owner session: ${newOwner}`);
			} else {
				console.log("No pending claims (they may have expired).");
			}
		},
	});

	// ── Lifecycle ────────────────────────────────────────────────────────────

	// GITEA_ENABLE_POLLING=1 opts in to running the webhook server + notification poller.
	// pi-bot (persistent session): enabled by default
	// openclaw (ephemeral sessions): disabled by default — events come via openclaw hooks
	const enablePolling = process.env.GITEA_ENABLE_POLLING === "1" ||
		(!process.env.GITEA_HOOKS_URL && !process.env.OPENCLAW_HOOKS_URL);

	pi.on("session_start", async (_event, ctx) => {
		console.log(`[pi-gitea] Session started (session: ${SESSION_ID})`);

		// Set up claim notification — alert the user when another session wants ownership
		setOnClaimRequested((claim) => {
			console.log(`[pi-gitea] Claim request from ${claim.sessionId} (${claim.cwd})`);
			console.log(`[pi-gitea] Use /webhook:release to hand off, or ignore to let it expire`);
		});

		// Auto-detect runtime: pi-bot (persistent session) vs openclaw (hooks endpoint)
		if (ctx.sendUserMessage) {
			// pi-bot: inject directly into the running session
			console.log("[pi-gitea] Delivery: sendUserMessage (pi-bot mode)");
			setSendMessage((msg: string) => {
				ctx.sendUserMessage(msg, { deliverAs: "followUp" });
				return Promise.resolve();
			});
		} else {
			// openclaw: POST to the hooks endpoint
			const hooksUrl = process.env.GITEA_HOOKS_URL ?? "http://localhost:3001";
			const hooksPath = process.env.GITEA_HOOKS_PATH ?? "/hooks/agent";
			const hooksToken = process.env.GITEA_HOOKS_TOKEN ?? "";
			console.log(`[pi-gitea] Delivery: openclaw hooks (${hooksUrl}${hooksPath})`);
			setSendMessage(async (msg: string) => {
				const res = await fetch(`${hooksUrl}${hooksPath}`, {
					method: "POST",
					headers: {
						"Content-Type": "application/json",
						...(hooksToken ? { Authorization: `Bearer ${hooksToken}` } : {}),
					},
					body: JSON.stringify({ message: msg }),
				});
				if (!res.ok) {
					const body = await res.text().catch(() => "");
					throw new Error(`Hooks POST failed: ${res.status} ${body}`);
				}
			});
		}

		if (enablePolling) {
			await startWebhookServer(pi);
			await startPolling(pi);
		} else {
			console.log("[pi-gitea] Webhook server + polling disabled (openclaw mode — tools only)");
		}
	});

	pi.on("session_shutdown", async () => {
		console.log("[pi-gitea] Session shutting down");
		if (enablePolling) {
			await stopWebhookServer();
			stopPolling();
		}
	});
}