import { Command } from 'commander';
import { generateCardDeck, type GenerateCardDeckParams, type CardField } from '../tools/generate-card-deck.js';
import { readFrontmatter, type ReadFrontmatterParams, type DeckFrontmatter } from '../tools/frontmatter/read-frontmatter.js';
import { writeFrontmatter, type WriteFrontmatterParams } from '../tools/frontmatter/write-frontmatter.js';
import { cardCrud, type CardCrudParams, type CardData } from '../tools/card/card-crud.js';
import { ensureDeckPreview, type EnsureDeckPreviewParams } from '../tools/ensure-deck-preview.js';
import {
  designCardGame,
  getDesignCardGamePrompt,
  type DesignCardGameOptions
} from '../prompts/design-card-game.js';
import {
  populateDeck,
  getPopulateDeckPrompt,
  type PopulateDeckOptions
} from '../prompts/populate-deck.js';
import {
  setupDeckDisplay,
  getSetupDeckDisplayPrompt,
  type SetupDeckDisplayOptions
} from '../prompts/setup-deck-display.js';
import {
  listResources,
  readResource,
  type DocResource
} from '../resources/docs.js';

/**
 * MCP 服务器命令
 *
 * 提供 MCP (Model Context Protocol) 服务器功能，用于与 AI 助手集成
 */

export interface MCPOptions {
  port?: string;
  cwd?: string;
}

export const mcpCommand = new Command('mcp')
  .description('MCP 服务器 - 用于 AI 助手集成的工具协议')
  .addCommand(
    new Command('serve')
      .description('启动 MCP 服务器')
      .argument('[host]', '服务器地址', 'stdio')
      .option('-p, --port <port>', 'HTTP 端口（仅 HTTP 传输）', '3001')
      .option('--cwd <dir>', '工作目录（工具调用的相对路径基准）', process.env.TTRPG_MCP_CWD || process.cwd())
      .action(mcpServeAction)
  )
  .addCommand(
    new Command('generate-card-deck')
      .description('生成卡牌组（快速命令）')
      .requiredOption('--name <name>', '卡牌组名称')
      .requiredOption('--output <dir>', '输出目录')
      .option('-c, --count <number>', '卡牌数量', '10')
      .option('--fields <fields>', '字段列表（逗号分隔）', 'name,type,cost,description')
      .option('--description <desc>', '卡牌组描述')
      .option('--size <size>', '卡牌尺寸', '54x86')
      .option('--grid <grid>', '网格布局', '5x8')
      .action(generateCardDeckAction)
  );

/**
 * MCP 服务器启动处理函数
 */
async function mcpServeAction(host: string, options: MCPOptions) {
  // 切换到指定的工作目录
  const cwd = options.cwd || process.cwd();
  process.chdir(cwd);
  console.error(`MCP 服务器工作目录：${cwd}`);

  // 动态导入 MCP SDK
  const { Server } = await import('@modelcontextprotocol/sdk/server/index.js');
  const { StdioServerTransport } = await import('@modelcontextprotocol/sdk/server/stdio.js');
  const {
    CallToolRequestSchema,
    ListToolsRequestSchema,
    ListPromptsRequestSchema,
    GetPromptRequestSchema,
    ListResourcesRequestSchema,
    ReadResourceRequestSchema,
  } = await import('@modelcontextprotocol/sdk/types.js');

  const server = new Server(
    {
      name: 'ttrpg-card-generator',
      version: '0.1.0',
    },
    {
      capabilities: {
        tools: {},
        prompts: {},
        resources: {},
      },
    }
  );

  // 处理工具列表请求
  server.setRequestHandler(ListToolsRequestSchema, async () => {
    return {
      tools: [
        {
          name: 'deck_frontmatter_read',
          description: '读取 CSV 文件的 frontmatter（包含模板定义和 deck 配置）',
          inputSchema: {
            type: 'object',
            properties: {
              csv_file: {
                type: 'string',
                description: 'CSV 文件路径（相对路径相对于 MCP 服务器工作目录）',
              },
            },
            required: ['csv_file'],
          },
        },
        {
          name: 'deck_frontmatter_write',
          description: '写入/更新 CSV 文件的 frontmatter（模板定义和 deck 配置）',
          inputSchema: {
            type: 'object',
            properties: {
              csv_file: {
                type: 'string',
                description: 'CSV 文件路径',
              },
              frontmatter: {
                type: 'object',
                description: '要写入的 frontmatter 数据',
                properties: {
                  fields: {
                    type: 'array',
                    description: '字段定义列表',
                    items: {
                      type: 'object',
                      properties: {
                        name: { type: 'string', description: '字段名称' },
                        description: { type: 'string', description: '字段描述' },
                        examples: { type: 'array', items: { type: 'string' }, description: '示例值列表' },
                      },
                      required: ['name'],
                    },
                  },
                  deck: {
                    type: 'object',
                    description: 'Deck 配置',
                    properties: {
                      size: { type: 'string', description: '卡牌尺寸，格式 "宽 x 高"' },
                      grid: { type: 'string', description: '网格布局，格式 "列 x 行"，表示卡牌排版区域分成多少行多少列，用于显示字段。默认使用5x8。' },
                      bleed: { type: 'number', description: '出血边距（mm）' },
                      padding: { type: 'number', description: '内边距（mm）' },
                      shape: { type: 'string', enum: ['rectangle', 'circle', 'hex', 'diamond'] },
                      layers: { type: 'string', description: '字段的显示图层配置。如`title:1,1-5,1f8n body:1,3-5,8f3n`表示将title字段的内容，显示在第1列1行到第5列1行的区域，8mm字体，上侧朝向北，body覆盖1列3行到5列行，3mm字体，上侧朝向北。通常希望重要的辨识字段放在左侧，如`rank:1,1-1,1f6 suit:1,2-1,2f6`。' },
                      back_layers: { type: 'string', description: '背面显示图层配置，与正面类似' },
                    },
                  },
                },
              },
              merge: {
                type: 'boolean',
                description: '是否合并现有 frontmatter（默认 true）',
                default: true,
              },
            },
            required: ['csv_file', 'frontmatter'],
          },
        },
        {
          name: 'deck_card_crud',
          description: '卡牌 CRUD 操作（创建/读取/更新/删除），支持批量操作',
          inputSchema: {
            type: 'object',
            properties: {
              csv_file: {
                type: 'string',
                description: 'CSV 文件路径',
              },
              action: {
                type: 'string',
                description: '操作类型',
                enum: ['create', 'read', 'update', 'delete'],
              },
              cards: {
                type: ['array', 'object'],
                description: '卡牌数据（单张或数组）',
                items: {
                  type: 'object',
                  additionalProperties: { type: 'string', description: "字段内容可以使用markdown语法。使用:[attack]来表示名为attack的图标。使用{{prop}}来引用另一个字段，或者frontmatter里的内容。" },
                },
              },
              label: {
                type: ['string', 'array'],
                description: '要操作的卡牌 label（用于 read/update/delete）',
                items: { type: 'string' },
              },
            },
            required: ['csv_file', 'action'],
          },
        },
        {
          name: 'deck_ensure_preview',
          description: '确保 CSV 对应的 Markdown 预览文件存在',
          inputSchema: {
            type: 'object',
            properties: {
              csv_file: {
                type: 'string',
                description: 'CSV 文件路径',
              },
              md_file: {
                type: 'string',
                description: 'Markdown 文件路径（可选，默认与 CSV 同名）',
              },
              title: {
                type: 'string',
                description: '标题（可选，默认从 CSV 文件名推断）',
              },
              description: {
                type: 'string',
                description: '描述（可选）',
              },
            },
            required: ['csv_file'],
          },
        },
      ],
    };
  });

  // 处理 Prompts 列表请求
  server.setRequestHandler(ListPromptsRequestSchema, async () => {
    return {
      prompts: [
        getDesignCardGamePrompt(),
        getPopulateDeckPrompt(),
        getSetupDeckDisplayPrompt(),
      ],
    };
  });

  // 处理工具调用请求
  server.setRequestHandler(CallToolRequestSchema, async (request) => {
    const { name, arguments: args } = request.params;

    try {
      switch (name) {
        case 'generate_card_deck': {
          const params = args as unknown as GenerateCardDeckParams;

          // 验证必需参数
          if (!params.deck_name || !params.output_dir) {
            return {
              content: [
                {
                  type: 'text',
                  text: '错误：缺少必需参数 deck_name 或 output_dir',
                },
              ],
              isError: true,
            };
          }

          // 生成卡牌组（使用当前工作目录）
          const result = generateCardDeck(params);

          return {
            content: [
              {
                type: 'text',
                text: result.message,
              },
              {
                type: 'text',
                text: `\n## 生成的组件代码\n\n\`\`\`markdown\n${result.deckComponent}\n\`\`\``,
              },
            ],
          };
        }

        case 'deck_frontmatter_read': {
          const params = args as unknown as ReadFrontmatterParams;

          if (!params.csv_file) {
            return {
              content: [{ type: 'text', text: '错误：缺少必需参数 csv_file' }],
              isError: true,
            };
          }

          const result = readFrontmatter(params);

          return {
            content: [
              {
                type: 'text',
                text: result.message,
              },
              ...(result.frontmatter ? [{
                type: 'text',
                text: `\n## Frontmatter\n\n\`\`\`json\n${JSON.stringify(result.frontmatter, null, 2)}\n\`\`\``,
              }] : []),
            ],
          };
        }

        case 'deck_frontmatter_write': {
          const params = args as unknown as WriteFrontmatterParams;

          if (!params.csv_file || !params.frontmatter) {
            return {
              content: [{ type: 'text', text: '错误：缺少必需参数 csv_file 或 frontmatter' }],
              isError: true,
            };
          }

          const result = writeFrontmatter(params);

          return {
            content: [{ type: 'text', text: result.success ? `✅ ${result.message}` : `❌ ${result.message}` }],
            isError: !result.success,
          };
        }

        case 'deck_card_crud': {
          const params = args as unknown as CardCrudParams;

          if (!params.csv_file || !params.action) {
            return {
              content: [{ type: 'text', text: '错误：缺少必需参数 csv_file 或 action' }],
              isError: true,
            };
          }

          const result = cardCrud(params);

          return {
            content: [
              {
                type: 'text',
                text: result.success ? `✅ ${result.message}` : `❌ ${result.message}`,
              },
              ...(result.cards && result.cards.length > 0 ? [{
                type: 'text',
                text: `\n## 卡牌数据\n\n\`\`\`json\n${JSON.stringify(result.cards, null, 2)}\n\`\`\``,
              }] : []),
            ],
            isError: !result.success,
          };
        }

        case 'deck_ensure_preview': {
          const params = args as unknown as EnsureDeckPreviewParams;

          if (!params.csv_file) {
            return {
              content: [{ type: 'text', text: '错误：缺少必需参数 csv_file' }],
              isError: true,
            };
          }

          const result = ensureDeckPreview(params);

          return {
            content: [{ type: 'text', text: result.success ? `✅ ${result.message}` : `❌ ${result.message}` }],
            isError: !result.success,
          };
        }

        default:
          return {
            content: [{ type: 'text', text: `未知工具：${name}` }],
            isError: true,
          };
      }
    } catch (error) {
      return {
        content: [{ type: 'text', text: `工具调用失败：${error instanceof Error ? error.message : '未知错误'}` }],
        isError: true,
      };
    }
  });

  // 处理 Prompts 获取请求
  server.setRequestHandler(GetPromptRequestSchema, async (request) => {
    const { name, arguments: args } = request.params;

    try {
      switch (name) {
        case 'design-card-game': {
          const options = args as unknown as DesignCardGameOptions;
          const result = designCardGame(options);
          return {
            description: '引导用户设计新的卡牌游戏系统，定义卡牌模板和字段结构',
            messages: result.messages,
          };
        }

        case 'populate-deck': {
          const options = args as unknown as PopulateDeckOptions;
          const result = populateDeck(options);
          return {
            description: '为已有的卡牌组生成和填充卡牌内容',
            messages: result.messages,
          };
        }

        case 'setup-deck-display': {
          const options = args as unknown as SetupDeckDisplayOptions;
          const result = setupDeckDisplay(options);
          return {
            description: '引导用户配置卡牌的显示参数（尺寸、布局、样式等）',
            messages: result.messages,
          };
        }

        default:
          throw new Error(`未知 prompt：${name}`);
      }
    } catch (error) {
      throw error;
    }
  });

  // 处理 Resources 列表请求
  server.setRequestHandler(ListResourcesRequestSchema, async () => {
    return {
      resources: listResources().map(r => ({
        uri: r.uri,
        name: r.name,
        title: r.title,
        description: r.description,
        mimeType: r.mimeType,
      })),
    };
  });

  // 处理 Resources 读取请求
  server.setRequestHandler(ReadResourceRequestSchema, async (request) => {
    const { uri } = request.params;

    const resource = readResource(uri, process.cwd());

    if (!resource) {
      throw new Error(`Resource not found: ${uri}`);
    }

    return {
      contents: [resource],
    };
  });

  // 启动服务器
  if (host === 'stdio') {
    const transport = new StdioServerTransport();
    await server.connect(transport);
    console.error('TTRPG 卡牌生成 MCP 服务器已启动（stdio）');
  } else {
    // TODO: 支持 HTTP 传输
    console.error('HTTP 传输模式尚未实现，请使用 stdio 模式');
    process.exit(1);
  }
}

/**
 * 快速生成卡牌组命令处理函数
 */
async function generateCardDeckAction(options: {
  name: string;
  output: string;
  count: string;
  fields: string;
  description?: string;
  size: string;
  grid: string;
}) {
  const fieldNames = options.fields.split(',').map(f => f.trim());

  const template = {
    fields: fieldNames.map((name): CardField => ({
      name,
      examples: ['示例 1', '示例 2']
    }))
  };

  const params: GenerateCardDeckParams = {
    deck_name: options.name,
    output_dir: options.output,
    card_count: parseInt(options.count, 10),
    card_template: template,
    deck_config: {
      size: options.size,
      grid: options.grid
    },
    description: options.description
  };

  const result = generateCardDeck(params);

  console.log('\n✅ 卡牌组生成成功！\n');
  console.log(result.message);
  console.log('\n📦 组件代码:');
  console.log(`   ${result.deckComponent}\n`);
}