import fetch from "node-fetch";
import { createComment } from "./comment.js";

const TEST_MERGE_COMMENT_HEADER = "<!-- test_merge_bot:";

const { GET_TEST_MERGES_URL } = process.env;

if (!GET_TEST_MERGES_URL) {
	console.error("GET_TEST_MERGES_URL was not set.");
	process.exit(1);
}

export async function processTestMerges({ github, context }) {
	const rounds = await fetch(GET_TEST_MERGES_URL)
		.then(async (response) => {
			if (response.status !== 200) {
				return Promise.reject(
					`Failed to fetch test merges: ${
						response.status
					} ${await response.text()}`
				);
			}

			return response;
		})
		.then((response) => response.json())
		.catch((error) => {
			console.error(error);
			process.exit(1);
		});

	// PR # -> server name -> test merge struct
	const testMergesPerPr = {};

	for (const round of rounds) {
		const { server, test_merges } = round;

		for (const testMerge of test_merges) {
			if (!testMergesPerPr[testMerge]) {
				testMergesPerPr[testMerge] = {};
			}

			if (!testMergesPerPr[testMerge][server]) {
				testMergesPerPr[testMerge][server] = [];
			}

			testMergesPerPr[testMerge][server].push(round);
		}
	}

	for (const [prNumber, servers] of Object.entries(testMergesPerPr)) {
		const comments = await github.graphql(
			`
		query($owner:String!, $repo:String!, $prNumber:Int!) {
			repository(owner: $owner, name: $repo) {
				pullRequest(number: $prNumber) {
					comments(last: 100) {
						nodes {
							body
							databaseId
							author {
								login
							}
						}
					}
				}
			}
		}`,
			{
				owner: context.repo.owner,
				repo: context.repo.repo,
				prNumber: parseInt(prNumber, 10),
			}
		);

		const existingComment =
			comments.repository.pullRequest.comments.nodes.find(
				(comment) =>
					comment.author?.login === "github-actions" &&
					comment.body.startsWith(TEST_MERGE_COMMENT_HEADER)
			);

		const newBody = createComment(servers, existingComment?.body);
		if (!newBody) {
			console.log(`No changes for PR #${prNumber}`);
			continue;
		}

		if (existingComment === undefined) {
			try {
				await github.rest.issues.createComment({
					owner: context.repo.owner,
					repo: context.repo.repo,
					issue_number: prNumber,
					body: newBody,
				});
			} catch (error) {
				if(error.status){
					console.error(`Failed to create comment for #{prNumber}`)
					console.error(error)
					continue;
				}
				else{
					throw error
				}
			}
		} else {
			try {
				await github.rest.issues.updateComment({
					owner: context.repo.owner,
					repo: context.repo.repo,
					comment_id: existingComment.databaseId,
					body: newBody,
				});
			} catch (error) {
				if(error.status){
					console.error(`Failed to update comment for #{prNumber}`)
					console.error(error)
					continue;
				}
				else{
					throw error
				}
			}
		}
	}
}