import type { IncomingMessage, ServerResponse } from 'node:http';
import type { ProjectType } from '../../../shared/project-config';
import type { CodingProjectConfigSnapshot } from '../../coding-projects/project-service';
import type { CodingProject } from '../../coding-projects/project-store';
import type { HostApiContext } from '../context';
import { parseJsonBody, sendJson, sendNoContent } from '../route-utils';
import { sendCodingRouteError } from './coding-route-errors';

function isProjectRoute(pathname: string): boolean {
  return pathname === '/api/coding/projects'
    || pathname.startsWith('/api/coding/projects/');
}

function publicProject(project: CodingProject | null): Omit<CodingProject, 'path'> | null {
  if (!project) return null;
  const { path: _path, ...safe } = project;
  return safe;
}

function publicProjectSnapshot(snapshot: CodingProjectConfigSnapshot) {
  return {
    ...snapshot,
    project: publicProject(snapshot.project),
  };
}

export async function handleCodingProjectRoutes(
  req: IncomingMessage,
  res: ServerResponse,
  url: URL,
  ctx: HostApiContext,
): Promise<boolean> {
  if (!isProjectRoute(url.pathname)) return false;
  const projects = ctx.codingProducts?.projects;
  const conversations = ctx.codingProducts?.conversations;
  if (!projects || !conversations) {
    sendJson(res, 503, {
      success: false,
      code: 'CODING_CORE_UNAVAILABLE',
      error: '本地编程服务暂时不可用。',
    });
    return true;
  }

  try {
    if (url.pathname === '/api/coding/projects' && req.method === 'GET') {
      const [items, activeProject] = await Promise.all([
        projects.listProjects(),
        projects.getActiveProject(),
      ]);
      sendJson(res, 200, {
        projects: items.map((project) => publicProject(project)),
        activeProjectId: activeProject?.id ?? null,
      });
      return true;
    }
    if (url.pathname === '/api/coding/projects/open' && req.method === 'POST') {
      const body = await parseJsonBody<{ projectPath?: string }>(req);
      sendJson(res, 200, { project: publicProject(await projects.openProject(body.projectPath ?? '')) });
      return true;
    }
    if (url.pathname === '/api/coding/projects/create' && req.method === 'POST') {
      const body = await parseJsonBody<{
        projectPath?: string;
        parentPath?: string;
        projectName?: string;
        projectType?: ProjectType;
      }>(req);
      sendJson(res, 201, { snapshot: publicProjectSnapshot(await projects.createProject(body)) });
      return true;
    }
    if (url.pathname === '/api/coding/projects/remove' && req.method === 'POST') {
      const body = await parseJsonBody<{ projectId?: string }>(req);
      await projects.removeProject(body.projectId ?? '');
      sendNoContent(res);
      return true;
    }
    if (url.pathname === '/api/coding/projects/active' && req.method === 'GET') {
      sendJson(res, 200, { project: publicProject(await projects.getActiveProject()) });
      return true;
    }
    if (url.pathname === '/api/coding/projects/active' && req.method === 'POST') {
      const body = await parseJsonBody<{ projectId?: string }>(req);
      sendJson(res, 200, { project: publicProject(await projects.setActiveProject(body.projectId ?? '')) });
      return true;
    }
    if (url.pathname === '/api/coding/projects/config' && req.method === 'GET') {
      sendJson(res, 200, {
        snapshot: publicProjectSnapshot(
          await projects.getConfig(url.searchParams.get('projectId')?.trim() || undefined),
        ),
      });
      return true;
    }
    if (url.pathname === '/api/coding/projects/config' && req.method === 'PUT') {
      const body = await parseJsonBody<{ projectId?: string; config?: unknown }>(req);
      sendJson(res, 200, {
        snapshot: publicProjectSnapshot(await projects.saveConfig(body.projectId ?? '', body.config)),
      });
      return true;
    }
    if (url.pathname === '/api/coding/projects/knowledge' && req.method === 'POST') {
      const body = await parseJsonBody<{
        projectId?: string;
        fileName?: string;
        contentBase64?: string;
      }>(req);
      sendJson(res, 201, {
        knowledgeFiles: await projects.addKnowledgeFile({
          projectId: body.projectId ?? '',
          fileName: body.fileName ?? '',
          contentBase64: body.contentBase64 ?? '',
        }),
      });
      return true;
    }
    if (url.pathname === '/api/coding/projects/legacy-conversation-notice/acknowledge'
      && req.method === 'POST') {
      const body = await parseJsonBody<{ projectId?: string }>(req);
      sendJson(res, 200, {
        snapshot: publicProjectSnapshot(
          await projects.acknowledgeLegacyConversationNotice(body.projectId ?? ''),
        ),
      });
      return true;
    }
    if (url.pathname === '/api/coding/projects/conversations' && req.method === 'GET') {
      sendJson(res, 200, {
        conversations: await conversations.listConversations(
          url.searchParams.get('projectId')?.trim() || undefined,
        ),
      });
      return true;
    }
    if (url.pathname === '/api/coding/projects/conversations' && req.method === 'POST') {
      const body = await parseJsonBody<{ projectId?: string; agentId?: unknown; title?: unknown }>(req);
      sendJson(res, 201, { conversation: await conversations.createConversation(body) });
      return true;
    }
  } catch (error) {
    sendCodingRouteError(res, error);
    return true;
  }
  return false;
}