import { existsSync, mkdirSync, readFileSync, statSync, writeFileSync } from "node:fs";
import type { ActiveRun, KdPhase } from "./types.ts";
import { PHASE_ARTIFACTS } from "./types.ts";
import { runArtifactPath, runRoot } from "./paths.ts";
import type { ProductProfile } from "../product/profile.ts";
import { PLAN_REQUIRED_CHECK_LINES, formatPromptLines } from "./prompt-policy.ts";

export function ensureRunDirectories(cwd: string, run: ActiveRun): void {
	mkdirSync(runRoot(cwd, run), { recursive: true });
	mkdirSync(runArtifactPath(cwd, run, "evidence"), { recursive: true });
}

export function artifactExists(cwd: string, run: ActiveRun, artifactName: string): boolean {
	try {
		return statSync(runArtifactPath(cwd, run, artifactName)).isFile();
	} catch {
		return false;
	}
}

export function phaseArtifactPath(cwd: string, run: ActiveRun, phase: KdPhase): string {
	return runArtifactPath(cwd, run, PHASE_ARTIFACTS[phase]);
}

export function readArtifact(cwd: string, run: ActiveRun, phase: KdPhase): string | undefined {
	const path = phaseArtifactPath(cwd, run, phase);
	try {
		return existsSync(path) ? readFileSync(path, "utf8") : undefined;
	} catch {
		return undefined;
	}
}

export function writeArtifact(cwd: string, run: ActiveRun, phase: KdPhase, content: string): string {
	ensureRunDirectories(cwd, run);
	const path = phaseArtifactPath(cwd, run, phase);
	writeFileSync(path, content.endsWith("\n") ? content : `${content}\n`, "utf8");
	run.artifacts[phase] = PHASE_ARTIFACTS[phase];
	return path;
}

export function ensureArtifact(cwd: string, run: ActiveRun, phase: KdPhase, content: string): string {
	const existing = readArtifact(cwd, run, phase);
	if (existing !== undefined) return phaseArtifactPath(cwd, run, phase);
	return writeArtifact(cwd, run, phase, content);
}

export function defaultArtifactContent(phase: KdPhase, goal?: string, profile?: ProductProfile): string {
	switch (phase) {
		case "discuss":
			return [
				"# 需求讨论上下文",
				"",
				`- 需求目标：${goal ?? "未知"}`,
				`- 金蝶产品：${profile?.product ?? "未知"}`,
				"- 版本：未知",
				`- 技术栈：${profile?.techStack ?? "未知"}`,
				`- 语言：${profile?.language ?? "未知"}`,
				"- 需求条目：未知",
				"- 目标对象：未知",
				"- 依赖和批次：未知",
				"- 非目标范围：未知",
				"- 待确认问题：",
				"  - 从需求来源中提取可确认事实；只把无法判断且阻塞推进的关键点列为待确认。",
				"",
			].join("\n");
		case "spec":
			return [
				"# 需求规格",
				"",
				"## 验收标准",
				"",
				"## 需求条目",
				"",
				"## 数据对象、字段或影响范围",
				"",
				"## 依赖和批次",
				"",
				"## 异常行为和性能约束",
				"",
				"## 假设和风险",
				"",
			].join("\n");
		case "plan":
			return [
				"# 实施计划",
				"",
				"## 已检查的项目结构",
				"",
				"## 待读取文件",
				"",
				"## 目标源码根 / 路径",
				"",
				"## 允许修改的文件",
				"",
				"## 产品实现范围",
				"",
				"- 是否涉及产品实现、构建、元数据或 SDK 查证：待确认",
				"- 判断依据：待确认",
				"",
				"## 必需的金蝶查证项",
				"",
				...formatPromptLines(PLAN_REQUIRED_CHECK_LINES),
				"",
				"## 需求条目 / 依赖 / 批次",
				"",
				"## 验收与验证对应关系",
				"",
				"## 执行步骤",
				"",
				"- [ ] STEP-001：检查现有目标文件，确认精确修改位置。",
				"- [ ] STEP-002：运行一个会失败的红灯检查，并记录红灯证据。",
				"- [ ] STEP-003：只实现已批准的文件改动。",
				"- [ ] STEP-004：再次运行同一检查，并记录绿灯证据。",
				"- [ ] STEP-005：记录变更文件和步骤证据。",
				"",
				"## TDD / 红绿检查",
				"",
				"- 红灯证据：evidence/tdd-red.md",
				"- 绿灯证据：evidence/tdd-green.md",
				"- 红绿检查命令或工具：未知",
				"- Java 语法/编译检查：使用当前项目 Gradle 命令，例如 `./gradlew build`、`.\\gradlew.bat build` 或 `./gradlew :模块:build`。",
				"- C# 语法/编译检查：使用 `dotnet build`、`dotnet build <.sln>` 或 `dotnet build <.csproj>`。",
				"- 允许的检查：本地 SDK 签名查证、官方 API/基类/方法查证、元数据查证、kd_check、Gradle/dotnet 构建输出、项目已有测试框架、外部接口最小验证。",
				"- 测试框架：使用项目已有测试基础设施。",
				"- 命令无法运行时记录真实阻塞原因和残余风险，不能作为绿灯证据。",
				"- 自动化测试不可执行时，记录一个产品相关、实现前应失败且实现后应通过的检查。",
				"- SDK 方法签名事实必须来自当前项目 jar/dll、构建输出或官方元数据。",
				"",
				"## 验证命令",
				"",
				"## 回滚 / 影响控制",
				"",
			].join("\n");
		case "execute":
			return [
				"# 执行记录",
				"",
				"## 步骤结果",
				"",
				"每个计划步骤按以下格式记录：",
				"",
				"- [x] STEP-001：已完成。证据：evidence/step-001.md",
				"",
				"## 变更文件",
				"",
				"## 偏离计划说明",
				"",
			].join("\n");
		case "verify":
			return ["# 验证记录", "", "## 命令", "", "## 证据", "", "## 残余风险", ""].join("\n");
		case "ship":
			return ["# 交付摘要", "", "## 摘要", "", "## 验证证据", "", "## 风险", "", "## 后续事项", ""].join("\n");
	}
}