import { config } from '../config'
import type { Platform } from '../types'

export class AgentClient {
  async health(platform: Platform): Promise<{ ok: boolean; message?: string }> {
    if (!platform.agentUrl) return { ok: false, message: 'platform_agent_url_missing' }

    const controller = new AbortController()
    const timeout = setTimeout(() => controller.abort(), Math.min(config.agentRequestTimeoutMs, 3000))

    try {
      const response = await fetch(`${platform.agentUrl.replace(/\/+$/, '')}/health`, {
        headers: this.agentHeaders(),
        signal: controller.signal
      })
      if (!response.ok) return { ok: false, message: `agent_health_failed:${response.status}` }
      const payload = await response.json().catch(() => ({ ok: true }))
      return { ok: payload?.ok !== false }
    } catch (error) {
      return { ok: false, message: error instanceof Error ? error.message : String(error) }
    } finally {
      clearTimeout(timeout)
    }
  }

  async visualizationStart(platform: Platform, input: {
    stack?: string;
    rosDomainId?: string;
    profile?: unknown;
  }): Promise<{ ok: boolean; running: boolean; stack: string | null; message?: string }> {
    return this.agentJson(platform, '/visualization/start', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify(input),
    });
  }

  async visualizationStop(platform: Platform, input: {
    stack?: string;
    profile?: unknown;
  } = {}): Promise<{ ok: boolean; running: boolean; stack: string | null; message?: string }> {
    return this.agentJson(platform, '/visualization/stop', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify(input),
    });
  }

  async visualizationStatus(platform: Platform): Promise<{ ok: boolean; running: boolean; stack: string | null; message?: string }> {
    return this.agentJson(platform, '/visualization/status');
  }

  async moduleStatuses(platform: Platform): Promise<unknown> {
    return this.agentJson(platform, '/api/modules/docker-statuses');
  }

  async moduleStart(platform: Platform, input: { folderName?: string; rosDomainId?: string }): Promise<unknown> {
    return this.agentJson(platform, '/api/modules/start', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify(input),
    });
  }

  async moduleStop(platform: Platform, input: { containerKey?: string }): Promise<unknown> {
    return this.agentJson(platform, '/api/modules/stop', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify(input),
    });
  }

  async syncAuthorizedKeys(platform: Platform, publicKeys: string[], sshUser?: string | null): Promise<unknown> {
    return this.agentJson(platform, '/api/ssh/authorized-keys', {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({ publicKeys, sshUser }),
    });
  }

  async runCommand(platform: Platform, command: string, args: string[]): Promise<{ commandId: string; accepted: boolean }> {
    if (!platform.agentUrl) return { commandId: crypto.randomUUID(), accepted: false }

    const controller = new AbortController()
    const timeout = setTimeout(() => controller.abort(), config.agentRequestTimeoutMs)

    try {
      const response = await fetch(`${platform.agentUrl}/commands`, {
        method: 'POST',
        headers: this.agentHeaders({ 'content-type': 'application/json' }),
        body: JSON.stringify({ command, args }),
        signal: controller.signal
      })
      if (!response.ok) throw new Error(`agent_command_failed:${response.status}`)
      const payload = await response.json().catch(() => ({}))
      return { commandId: String(payload.commandId ?? crypto.randomUUID()), accepted: true }
    } catch {
      return { commandId: crypto.randomUUID(), accepted: false }
    } finally {
      clearTimeout(timeout)
    }
  }

  async emergencyStop(platform: Platform): Promise<{ accepted: boolean }> {
    const controller = new AbortController()
    const timeout = setTimeout(() => controller.abort(), config.agentRequestTimeoutMs)

    try {
      const response = await fetch(`${platform.agentUrl}/emergency-stop`, {
        method: 'POST',
        headers: this.agentHeaders(),
        signal: controller.signal
      })
      return { accepted: response.ok }
    } catch {
      return { accepted: false }
    } finally {
      clearTimeout(timeout)
    }
  }

  private async agentJson<T>(platform: Platform, path: string, init?: RequestInit): Promise<T> {
    if (!platform.agentUrl) throw new Error('platform_agent_url_missing')

    const controller = new AbortController()
    const timeout = setTimeout(() => controller.abort(), config.agentRequestTimeoutMs)

    try {
      const response = await fetch(`${platform.agentUrl.replace(/\/+$/, '')}${path}`, {
        ...init,
        headers: this.agentHeaders(init?.headers),
        signal: controller.signal,
      })
      const payload = await response.json().catch(() => ({}))
      if (!response.ok) throw new Error(String(payload?.message ?? payload?.error ?? `agent_request_failed:${response.status}`))
      return payload as T
    } finally {
      clearTimeout(timeout)
    }
  }

  private agentHeaders(headers?: HeadersInit): HeadersInit {
    const next = new Headers(headers)
    if (config.agentGatewayToken) {
      next.set('x-agent-gateway-token', config.agentGatewayToken)
    }
    return next
  }
}

export const agentClient = new AgentClient()