import { existsSync } from "node:fs";
import { mkdir, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { CHANGES_DIR, ARCHIVE_DIR, RUNE_DIR, CONFIG_FILE } from "../types.ts";
import { injectOpenCode } from "../adapters/opencode.ts";
import { injectClaudeCode } from "../adapters/claude-code.ts";
import { CommandError } from "../cli/errors.ts";

const CONFIG_TEMPLATE = `# Rune 配置文件
# 
# 未配置的阶段将使用内置默认配置。
# 阶段顺序：discuss -> plan -> build -> archive
#
# 可配置阶段：
#   discuss  - 探索阶段：深度思考、调查代码库、对比方案
#   plan     - 规划阶段：生成设计文档和任务清单
#   build    - 构建阶段：按任务清单逐步实现
#   archive  - 归档阶段：确认完成并归档变更
#
# 示例 - 自定义讨论阶段提示词：
# stages:
#   discuss:
#     prompt: |
#      进入探索模式。深度思考，自由发散。跟随对话走向。
#
# 示例 - 自定义规划阶段的文档模板：
# stages:
#   plan:
#     documents:
#       - name: design
#         prompt: 生成设计文档
#         template: |
#           # {{change-name}} 设计文档
#       - name: task
#         prompt: 生成任务清单
#         depend: [design]
#         template: |
#           # {{change-name}} 任务清单
`;

export const SUPPORTED_TOOLS: Record<string, (root: string) => Promise<void>> = {
  opencode: injectOpenCode,
  "claude-code": injectClaudeCode,
};

export async function runInit(projectRoot: string, tools: string[]): Promise<void> {
  for (const tool of tools) {
    if (!SUPPORTED_TOOLS[tool]) {
      throw new CommandError(`不支持的工具: ${tool}`, {
        hint: `支持的工具: ${Object.keys(SUPPORTED_TOOLS).join(", ")}`,
      });
    }
  }

  const runeDir = join(projectRoot, RUNE_DIR);
  await mkdir(runeDir, { recursive: true });
  await mkdir(join(runeDir, CHANGES_DIR), { recursive: true });
  await mkdir(join(runeDir, ARCHIVE_DIR), { recursive: true });

  const configPath = join(runeDir, CONFIG_FILE);
  if (!existsSync(configPath)) {
    await writeFile(configPath, CONFIG_TEMPLATE, "utf-8");
  }

  for (const tool of tools) {
    await SUPPORTED_TOOLS[tool](projectRoot);
  }
}