import type {
  PaginatedResponse,
  Credential,
  Environment,
  ScenarioCredential,
  Session,
  Scenario,
  ScenarioRun,
  ScenarioRunDetail,
  ScenarioRunStep,
  ScenarioStep,
  Snippet,
} from './types';
import { emitApiErrorToast } from '../lib/toast-events';

// API calls are versioned under /api/v1 by default.
// Set VITE_API_URL (for example, http://localhost:13000/api/v1) to use a different origin.
const BASE_URL = ((import.meta.env.VITE_API_URL as string | undefined) ?? '/api/v1').replace(
  /\/$/,
  '',
);

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  let res: Response;
  try {
    res = await fetch(`${BASE_URL}${path}`, {
      headers: { 'Content-Type': 'application/json', ...init?.headers },
      ...init,
    });
  } catch (err) {
    const message = (err as Error).message || 'Network request failed';
    emitApiErrorToast(message);
    throw new Error(message);
  }
  if (!res.ok) {
    const text = await res.text().catch(() => res.statusText);
    const message = `${res.status} ${text}`;
    emitApiErrorToast(message);
    throw new Error(message);
  }
  const contentLength = res.headers.get('content-length');
  if (res.status === 204 || contentLength === '0') return undefined as T;
  const contentType = res.headers.get('content-type')?.toLowerCase() ?? '';
  const text = await res.text();
  if (!text) return undefined as T;
  if (contentType.includes('application/json')) {
    return JSON.parse(text) as T;
  }
  return text as T;
}

// ── Credentials ───────────────────────────────────────────────────────────────

export const credentials = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Credential>> {
    return request(`/credentials?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Credential> {
    return request(`/credentials/${id}`);
  },
  create(name: string, data?: string): Promise<Credential> {
    return request('/credentials', {
      method: 'POST',
      body: JSON.stringify({ name, data }),
    });
  },
  update(id: string, patch: Partial<Pick<Credential, 'name' | 'data'>>): Promise<Credential> {
    return request(`/credentials/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/credentials/${id}`, { method: 'DELETE' });
  },
  exportCredential(id: string): Promise<unknown> {
    return request(`/credentials/${id}/export`);
  },
  importCredential(payload: unknown): Promise<Credential> {
    return request('/credentials/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Snippets ──────────────────────────────────────────────────────────────────

export const snippets = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Snippet>> {
    return request(`/snippets?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Snippet> {
    return request(`/snippets/${id}`);
  },
  create(
    payload: Pick<Snippet, 'alias' | 'title' | 'code'> & { description?: string },
  ): Promise<Snippet> {
    return request('/snippets', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
  update(
    id: string,
    patch: Partial<Pick<Snippet, 'alias' | 'title' | 'description' | 'code'>>,
  ): Promise<Snippet> {
    return request(`/snippets/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/snippets/${id}`, { method: 'DELETE' });
  },
  exportSnippet(id: string): Promise<unknown> {
    return request(`/snippets/${id}/export`);
  },
  importSnippet(payload: unknown): Promise<Snippet> {
    return request('/snippets/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Environments ──────────────────────────────────────────────────────────────

export const environments = {
  list(page = 1, limit = 50): Promise<PaginatedResponse<Environment>> {
    return request(`/environments?page=${page}&limit=${limit}`);
  },
  get(id: string): Promise<Environment> {
    return request(`/environments/${id}`);
  },
  create(name: string, data: Environment['data'], description?: string): Promise<Environment> {
    return request('/environments', {
      method: 'POST',
      body: JSON.stringify({ name, description, data }),
    });
  },
  update(id: string, patch: Partial<Pick<Environment, 'name' | 'description' | 'data'>>): Promise<Environment> {
    return request(`/environments/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/environments/${id}`, { method: 'DELETE' });
  },
  exportEnvironment(id: string): Promise<unknown> {
    return request(`/environments/${id}/export`);
  },
  importEnvironment(payload: unknown): Promise<Environment> {
    return request('/environments/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Sessions ──────────────────────────────────────────────────────────────────

export const sessions = {
  list(page = 1, limit = 50, orderBy = 'id', orderDir: 'ASC' | 'DESC' = 'DESC'): Promise<PaginatedResponse<Session>> {
    return request(`/sessions?page=${page}&limit=${limit}&orderBy=${orderBy}&orderDir=${orderDir}`);
  },
  get(id: string): Promise<Session> {
    return request(`/sessions/${id}`);
  },
  remove(id: string): Promise<void> {
    return request(`/sessions/${id}`, { method: 'DELETE' });
  },
};

// ── Scenarios ─────────────────────────────────────────────────────────────────

export const scenarios = {
  list(
    page = 1,
    limit = 50,
    orderBy = 'updatedAt',
    orderDir: 'ASC' | 'DESC' = 'DESC',
  ): Promise<PaginatedResponse<Scenario>> {
    return request(`/scenarios?page=${page}&limit=${limit}&orderBy=${orderBy}&orderDir=${orderDir}`);
  },
  get(id: string): Promise<Scenario & { steps: ScenarioStep[] }> {
    return request(`/scenarios/${id}`);
  },
  create(name: string, description?: string, environmentId?: string): Promise<Scenario> {
    return request('/scenarios', {
      method: 'POST',
      body: JSON.stringify({ name, description, environmentId }),
    });
  },
  update(id: string, patch: Partial<Pick<Scenario, 'name' | 'description' | 'environmentId' | 'timeoutSeconds'>>): Promise<Scenario> {
    return request(`/scenarios/${id}`, {
      method: 'PATCH',
      body: JSON.stringify(patch),
    });
  },
  remove(id: string): Promise<void> {
    return request(`/scenarios/${id}`, { method: 'DELETE' });
  },
  run(id: string, environmentId: string, saveSession?: boolean): Promise<ScenarioRun> {
    return request(`/scenarios/${id}/run`, {
      method: 'POST',
      body: JSON.stringify({ environmentId, saveSession }),
    });
  },
  getRun(scenarioId: string, runId: string): Promise<ScenarioRunDetail> {
    return request(`/scenarios/${scenarioId}/run/${runId}`);
  },
  waitForRun(scenarioId: string, runId: string): Promise<ScenarioRunDetail> {
    return request(`/scenarios/${scenarioId}/run/${runId}/wait`, { method: 'POST' });
  },
  listRuns(
    scenarioId: string,
    page = 1,
    limit = 20,
  ): Promise<PaginatedResponse<ScenarioRun & { stepRuns: ScenarioRunStep[] }>> {
    return request(`/scenarios/${scenarioId}/runs?page=${page}&limit=${limit}`);
  },
  exportScenario(
    id: string,
    options: { includeEnvironment: boolean; credentialIds: string[] } = {
      includeEnvironment: false,
      credentialIds: [],
    },
  ): Promise<string> {
    const params = new URLSearchParams();
    params.set('includeEnvironment', String(options.includeEnvironment));
    for (const cid of options.credentialIds) {
      params.append('credentialIds', cid);
    }
    return request(`/scenarios/${id}/export?${params.toString()}`);
  },
  importScenario(payload: unknown): Promise<Scenario> {
    return request('/scenarios/import', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
};

// ── Runs ─────────────────────────────────────────────────────────────────────

export const runs = {
  listAll(
    page = 1,
    limit = 20,
    status?: string,
    orderBy = 'createdAt',
    orderDir: 'ASC' | 'DESC' = 'DESC',
  ): Promise<
    PaginatedResponse<
      ScenarioRun & { scenario: { id: string; name: string } }
    >
  > {
    const q = new URLSearchParams({ page: String(page), limit: String(limit), orderBy, orderDir });
    if (status) q.set('status', status);
    return request(`/scenarios/runs?${q}`);
  },
  list(
    scenarioId: string,
    page = 1,
    limit = 20,
    orderBy = 'createdAt',
    orderDir: 'ASC' | 'DESC' = 'DESC',
  ): Promise<PaginatedResponse<ScenarioRun & { stepRuns: ScenarioRunStep[] }>> {
    return request(`/scenarios/${scenarioId}/runs?page=${page}&limit=${limit}&orderBy=${orderBy}&orderDir=${orderDir}`);
  },
  get(scenarioId: string, runId: string, q?: string): Promise<ScenarioRunDetail> {
    const qs = q?.trim() ? `?q=${encodeURIComponent(q.trim())}` : '';
    return request(`/scenarios/${scenarioId}/run/${runId}${qs}`);
  },
};

// ── Scenario Credentials ──────────────────────────────────────────────────────

export const scenarioCredentials = {
  list(scenarioId: string): Promise<ScenarioCredential[]> {
    return request(`/scenarios/${scenarioId}/credentials`);
  },
  add(scenarioId: string, credentialId: string, alias: string): Promise<ScenarioCredential> {
    return request(`/scenarios/${scenarioId}/credentials`, {
      method: 'POST',
      body: JSON.stringify({ credentialId, alias }),
    });
  },
  remove(scenarioId: string, scCredId: string): Promise<void> {
    return request(`/scenarios/${scenarioId}/credentials/${scCredId}`, {
      method: 'DELETE',
    });
  },
};

// ── Scenario Steps ────────────────────────────────────────────────────────────
export interface CreateStepPayload {
  title?: string;
  execCode?: string;
  timeoutSeconds?: number | null;
}

export interface UpdateStepPayload {
  title?: string;
  order?: number;
  execCode?: string;
  timeoutSeconds?: number | null;
}

export const steps = {
  get(scenarioId: string, stepId: string): Promise<ScenarioStep> {
    return request(`/scenarios/${scenarioId}/steps/${stepId}`);
  },
  create(scenarioId: string, payload: CreateStepPayload): Promise<ScenarioStep> {
    return request(`/scenarios/${scenarioId}/steps`, {
      method: 'POST',
      body: JSON.stringify(payload),
    });
  },
  update(scenarioId: string, stepId: string, payload: UpdateStepPayload): Promise<ScenarioStep> {
    return request(`/scenarios/${scenarioId}/steps/${stepId}`, {
      method: 'PATCH',
      body: JSON.stringify(payload),
    });
  },
  remove(scenarioId: string, stepId: string): Promise<void> {
    return request(`/scenarios/${scenarioId}/steps/${stepId}`, { method: 'DELETE' });
  },
};