import { type ReviewPayload, reviewMarker } from "./github.ts";
import type { ReportLanguage } from "./language.ts";
import type { Finding, ReviewResult } from "./types.ts";

const FOOTER = "This review is AI-generated by pi-code-review.";

function findingBody(finding: Finding, language: ReportLanguage): string {
	const evidence = language === "zh-CN" ? "证据" : "Evidence";
	const suggestion = language === "zh-CN" ? "修复建议" : "Suggested fix";
	let body = `**${finding.title}**\n\n${finding.description}\n\n${evidence}: ${finding.evidence}`;
	if (finding.suggestion) body += `\n\n${suggestion}:\n\n${finding.suggestion}`;
	return body;
}

function permanentLink(
	result: ReviewResult,
	finding: Finding,
): string | undefined {
	const snapshot = result.snapshot;
	if (!snapshot || !finding.path) return undefined;
	const encodedPath = finding.path.split("/").map(encodeURIComponent).join("/");
	return `https://github.com/${snapshot.owner}/${snapshot.repo}/blob/${snapshot.headSha}/${encodedPath}`;
}

export function buildReviewPayload(
	result: ReviewResult,
	language: ReportLanguage = "en",
): ReviewPayload {
	if (result.status !== "complete" || !result.snapshot)
		throw new Error("Only complete reviews may be published");
	const inline = result.findings.filter((finding) => finding.kind === "code");
	const summaryOnly = result.findings.filter(
		(finding) => finding.kind === "task-omission",
	);
	let body = language === "zh-CN" ? "## 代码审查" : "## Code review";
	if (result.findings.length === 0) {
		body +=
			language === "zh-CN"
				? "\n\n未发现问题。已检查任务完成度、变更范围、缺陷、回归、权限与安全风险、维护风险，以及 AGENTS.md 合规性。"
				: "\n\nNo issues found. Checked task completion, scope, bugs, regressions, permission and security risks, maintenance risks, and AGENTS.md compliance.";
	} else if (summaryOnly.length > 0) {
		body += `\n\n${summaryOnly
			.map((finding, index) => {
				const link = permanentLink(result, finding);
				return `${index + 1}. ${findingBody(finding, language)}${link ? `\n\n${link}` : ""}`;
			})
			.join("\n\n")}`;
	} else {
		body +=
			language === "zh-CN"
				? `\n\n发现 ${inline.length} 个高置信行内问题。`
				: `\n\nFound ${inline.length} high-confidence inline issue${inline.length === 1 ? "" : "s"}.`;
	}
	body +=
		result.findings.length === 0
			? language === "zh-CN"
				? "\n\n**合并结论：从本次代码审查结果看，建议合并。**"
				: "\n\n**Merge recommendation: Merge based on this code review.**"
			: language === "zh-CN"
				? "\n\n**合并结论：不建议当前合并，请先解决上述高置信问题。**"
				: "\n\n**Merge recommendation: Do not merge until the high-confidence issues above are resolved.**";
	body += `\n\n${FOOTER}\n\n${reviewMarker(result.snapshot.headSha)}`;
	return {
		commit_id: result.snapshot.headSha,
		event: "COMMENT",
		body,
		comments: inline.map((finding) => ({
			path: finding.path,
			line: finding.line,
			side: finding.side,
			...(finding.startLine === undefined
				? {}
				: { start_line: finding.startLine, start_side: finding.side }),
			body: findingBody(finding, language),
		})),
	};
}