/**
 * kcode 首次启动：生成 Trellis 工作流文件 + KCode 平台配置。
 *
 * - .trellis/ ← project-templates/ 拷贝（workflow.md, scripts/ 等）
 * - .trellis/spec/ ← KCode 金蝶 spec template（README + backend + shared + guides）
 * - .kcode/ ← project-templates/ 拷贝（settings.json, extensions/, agents/, skills/）
 * - AGENTS.md / CLAUDE.md ← 模板拷贝
 * - 创建 00-bootstrap-guidelines 任务
 */
import * as fs from "node:fs";
import * as path from "node:path";
import { fileURLToPath } from "node:url";
import { ROOT_AGENTS_MD, ROOT_CLAUDE_MD } from "./project-init-templates";
import { initKcodeDir, initTrellisDir, loadAllInitTemplates } from "./project-template-loader";
import { writeProductsToProjectMd } from "./product-md";

export interface InitKingdeeProjectResult {
	generated: string[];
}

function ensureFile(filePath: string, content: string, generated: string[]): void {
	if (fs.existsSync(filePath)) return;
	try {
		fs.mkdirSync(path.dirname(filePath), { recursive: true });
		fs.writeFileSync(filePath, content, "utf8");
		generated.push(filePath);
	} catch {
		console.warn(`⚠ 无法创建 ${filePath}`);
	}
}

function pickContent(loaded: string | undefined, fallback: string): string {
	return loaded?.trim() ? loaded : fallback;
}

function shouldSkipTemplateEntry(name: string): boolean {
	return name === "__pycache__" || name.endsWith(".pyc") || name.endsWith(".pyo");
}

function copyDir(src: string, dest: string, generated: string[]): void {
	if (!fs.existsSync(src)) return;
	fs.mkdirSync(dest, { recursive: true });
	const entries = fs.readdirSync(src, { withFileTypes: true });
	for (const entry of entries) {
		if (shouldSkipTemplateEntry(entry.name)) continue;
		const s = path.join(src, entry.name);
		const d = path.join(dest, entry.name);
		if (entry.isDirectory()) {
			copyDir(s, d, generated);
		} else if (entry.isFile() && !fs.existsSync(d)) {
			fs.cpSync(s, d);
			generated.push(d);
		}
	}
}

function productIdsFromInitLine(productLine?: string | null): string[] {
	if (productLine === "cosmic") return ["cosmic-java"];
	if (productLine === "enterprise") return ["enterprise-csharp"];
	return [];
}

export function initKingdeeProjectFiles(cwd: string, productLine?: string | null): InitKingdeeProjectResult {
	const generated: string[] = [];
	const t = loadAllInitTemplates(cwd);

	// 1. 拷贝 .trellis/ 核心目录（spec/ 单独按 KCode 模板整体拷贝）
	generated.push(...initTrellisDir(cwd));

	// 2. 拷贝 .kcode/ 平台配置，供 KCode runtime 原生发现 extension/skills/prompts
	generated.push(...initKcodeDir(cwd));

	// 3. 拷贝 KCode 金蝶 spec template
	const pkgRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
	const specBase = path.join(pkgRoot, "project-templates", ".trellis", "spec");
	copyDir(specBase, path.join(cwd, ".trellis", "spec"), generated);

	const productIds = productIdsFromInitLine(productLine);
	if (productIds.length > 0) {
		writeProductsToProjectMd(cwd, productIds);
	}

	// 4. 创建 bootstrap 任务
	const taskDir = path.join(cwd, ".trellis", "tasks", "00-bootstrap-guidelines");
	if (!fs.existsSync(taskDir)) {
		fs.mkdirSync(taskDir, { recursive: true });
		const taskJson = {
			id: "00-bootstrap-guidelines",
			name: "00-bootstrap-guidelines",
			title: "Bootstrap Guidelines",
			description: "Fill in the initial project specifications and conventions",
			status: "planning",
			dev_type: "docs",
			priority: "P1",
			createdAt: new Date().toISOString().slice(0, 10),
			relatedFiles: [
				".trellis/spec/README.md",
				".trellis/spec/shared/project-context.md",
				".trellis/spec/backend/index.md",
			],
		};
		fs.writeFileSync(path.join(taskDir, "task.json"), JSON.stringify(taskJson, null, 2), "utf8");
		generated.push(path.join(taskDir, "task.json"));

		const prd = `# Bootstrap Guidelines\n\n## Goal\n\nFill in the initial project specifications in \`.trellis/spec/\` with real project conventions.\n\n## What to Do\n1. Review \`.trellis/spec/README.md\`\n2. Confirm product profile in \`.trellis/spec/shared/project-context.md\`\n3. Review the relevant backend and shared specs for this project\n4. Archive this task when done.\n`;
		fs.writeFileSync(path.join(taskDir, "prd.md"), prd, "utf8");
		generated.push(path.join(taskDir, "prd.md"));
	}

	// 5. AGENTS.md / CLAUDE.md
	ensureFile(path.join(cwd, "AGENTS.md"), pickContent(t.rootAgents, ROOT_AGENTS_MD), generated);
	ensureFile(path.join(cwd, "CLAUDE.md"), pickContent(t.rootClaude, ROOT_CLAUDE_MD), generated);

	return { generated };
}

export function formatInitKingdeeProjectMessage(cwd: string, generated: string[]): string | undefined {
	if (generated.length === 0) return undefined;
	const lines = ["\n首次启动完成。已生成 Trellis 工作流文件："];
	for (const abs of generated) {
		lines.push(`  ✓ ${path.relative(cwd, abs)}`);
	}
	lines.push("\n请先阅读 .trellis/workflow.md 了解工作流，再开始开发。\n");
	return lines.join("\n");
}