const BASE = '/api'

export class ApiError extends Error {
  code: string
  constructor(code: string, message: string) {
    super(message)
    this.name = 'ApiError'
    this.code = code
  }
}

async function throwApiError(res: Response): Promise<never> {
  let code = ''
  let msg = `${res.status} ${res.statusText}`
  try {
    const data = await res.json()
    if (data.error) code = data.error
    if (data.message) msg = data.message
  } catch {}
  throw new ApiError(code, msg)
}

async function get<T>(path: string): Promise<T> {
  const res = await fetch(`${BASE}${path}`)
  if (!res.ok) await throwApiError(res)
  return res.json()
}

async function patch<T>(path: string, body: unknown): Promise<T> {
  const res = await fetch(`${BASE}${path}`, {
    method: 'PATCH',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  })
  if (!res.ok) await throwApiError(res)
  return res.json()
}

async function post<T>(path: string, body: unknown): Promise<T> {
  const res = await fetch(`${BASE}${path}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  })
  if (!res.ok) await throwApiError(res)
  return res.json()
}

async function del<T>(path: string): Promise<T> {
  const res = await fetch(`${BASE}${path}`, { method: 'DELETE' })
  if (!res.ok) await throwApiError(res)
  if (res.status === 204) return undefined as T
  return res.json()
}

async function postForm<T>(path: string, body: FormData): Promise<T> {
  const res = await fetch(`${BASE}${path}`, { method: 'POST', body })
  if (!res.ok) await throwApiError(res)
  return res.json()
}

export interface Project {
  id: string
  name: string
  path: string
  status: string
  priority: number
  tech_stack: string[] | null
  execution_mode: string | null
  autocommit_enabled: number | null
  auto_test_enabled: number | null
  worktrees_enabled: number | null
  obsidian_vault_path: string | null
  deploy_command: string | null
  test_command: string | null
  deploy_host: string | null
  deploy_path: string | null
  deploy_runtime: string | null
  deploy_restart_cmd: string | null
  created_at: string
  total_tasks: number
  done_tasks: number
  active_tasks: number
  blocked_tasks: number
  review_tasks: number
  project_type: string | null
  ssh_host: string | null
  ssh_user: string | null
  ssh_key_path: string | null
  ssh_proxy_jump: string | null
  description: string | null
}

export interface ObsidianSyncResult {
  exported_decisions: number
  tasks_updated: number
  errors: string[]
  vault_path: string
}

export interface ProjectDetail extends Project {
  tasks: Task[]
  modules: Module[]
  decisions: Decision[]
}

export interface Task {
  id: string
  project_id: string
  title: string
  status: string
  priority: number
  assigned_role: string | null
  parent_task_id: string | null
  brief: Record<string, unknown> | null
  spec: Record<string, unknown> | null
  execution_mode: string | null
  blocked_reason: string | null
  dangerously_skipped: number | null
  category: string | null
  acceptance_criteria: string | null
  feedback?: string | null
  created_at: string
  updated_at: string
}

export interface Decision {
  id: number
  project_id: string
  task_id: string | null
  type: string
  category: string | null
  title: string
  description: string
  tags: string[] | null
  created_at: string
}

export interface Module {
  id: number
  project_id: string
  name: string
  type: string
  path: string
  description: string | null
  owner_role: string | null
  dependencies: string[] | null
}

export interface PipelineStep {
  id: number
  agent_role: string
  action: string
  output_summary: string | null
  success: boolean | number
  duration_seconds: number | null
  tokens_used: number | null
  model: string | null
  cost_usd: number | null
  created_at: string
}

export interface DeployStepResult {
  step: string
  command: string
  stdout: string
  stderr: string
  exit_code: number
}

export interface DeployResult {
  success: boolean
  exit_code: number
  stdout: string
  stderr: string
  duration_seconds: number
  steps?: string[]
  results?: DeployStepResult[]
  // WARNING (decision #546): бэкенд возвращает list[str] (project_id), не объекты
  dependents_deployed?: string[]
  overall_success?: boolean
}

export interface ProjectLink {
  id: number
  from_project: string
  to_project: string
  // WARNING (decision #527): поле называется `type` — так отдаёт бэкенд.
  // НЕ переименовывать в link_type — это вызовет runtime undefined во всех компонентах.
  type: string
  description: string | null
  created_at: string
}

export interface TaskFull extends Task {
  pipeline_steps: PipelineStep[]
  related_decisions: Decision[]
  project_deploy_command: string | null
  project_deploy_host: string | null
  project_deploy_path: string | null
  project_deploy_runtime: string | null
  pipeline_id: string | null
}

export interface PipelineLog {
  id: number
  ts: string
  level: 'INFO' | 'DEBUG' | 'ERROR' | 'WARN'
  message: string
  extra_json: Record<string, unknown> | null
}

export interface PendingAction {
  type: string
  description: string
  original_item: Record<string, unknown>
  options: string[]
}

export interface CostEntry {
  project_id: string
  project_name: string
  runs: number
  total_tokens: number
  total_cost_usd: number
  total_duration_seconds: number
}

export interface Phase {
  id: number
  project_id: string
  role: string
  phase_order: number
  status: string
  task_id: string | null
  revise_count: number
  revise_comment: string | null
  created_at: string
  updated_at: string
  task?: Task | null
}

export interface NewProjectPayload {
  id: string
  name: string
  path: string
  description: string
  roles: string[]
  tech_stack?: string[]
  priority?: number
  language?: string
  project_type?: string
  ssh_host?: string
  ssh_user?: string
  ssh_key_path?: string
  ssh_proxy_jump?: string
}

export interface NewProjectResult {
  project: Project
  phases: Phase[]
}

export interface AuditItem {
  id: string
  reason: string
}

export interface AuditResult {
  success: boolean
  already_done: AuditItem[]
  still_pending: AuditItem[]
  unclear: AuditItem[]
  duration_seconds?: number
  cost_usd?: number
  error?: string
}

export interface ProjectEnvironment {
  id: number
  project_id: string
  name: string
  host: string
  port: number
  username: string
  auth_type: string
  is_installed: number
  created_at: string
  updated_at: string
}

export interface EscalationNotification {
  task_id: string
  project_id: string
  agent_role: string
  reason: string
  pipeline_step: string | null
  blocked_at: string
  telegram_sent: boolean
}

export interface ChatMessage {
  id: number
  project_id: string
  role: 'user' | 'assistant'
  content: string
  message_type: string
  task_id: string | null
  created_at: string
  task_stub?: {
    id: string
    title: string
    status: string
  } | null
}

export interface ChatSendResult {
  user_message: ChatMessage
  assistant_message: ChatMessage
  task?: Task | null
}

export interface Attachment {
  id: number
  task_id: string
  filename: string
  mime_type: string
  size: number
  created_at: string
}

export const api = {
  projects: () => get<Project[]>('/projects'),
  project: (id: string) => get<ProjectDetail>(`/projects/${id}`),
  task: (id: string) => get<Task>(`/tasks/${id}`),
  taskFull: (id: string) => get<TaskFull>(`/tasks/${id}/full`),
  taskPipeline: (id: string) => get<PipelineStep[]>(`/tasks/${id}/pipeline`),
  cost: (days = 7) => get<CostEntry[]>(`/cost?days=${days}`),
  createProject: (data: { id: string; name: string; path?: string; tech_stack?: string[]; priority?: number; project_type?: string; ssh_host?: string; ssh_user?: string; ssh_key_path?: string; ssh_proxy_jump?: string }) =>
    post<Project>('/projects', data),
  createTask: (data: { project_id: string; title: string; priority?: number; route_type?: string; category?: string; acceptance_criteria?: string }) =>
    post<Task>('/tasks', data),
  approveTask: (id: string, data?: { decision_title?: string; decision_description?: string; decision_type?: string; create_followups?: boolean }) =>
    post<{ status: string; followup_tasks: Task[]; needs_decision: boolean; pending_actions: PendingAction[] }>(`/tasks/${id}/approve`, data || {}),
  resolveAction: (id: string, action: PendingAction, choice: string) =>
    post<{ choice: string; result: unknown }>(`/tasks/${id}/resolve`, { action, choice }),
  rejectTask: (id: string, reason: string) =>
    post<{ status: string }>(`/tasks/${id}/reject`, { reason }),
  reviseTask: (id: string, comment: string) =>
    post<{ status: string; comment: string }>(`/tasks/${id}/revise`, { comment }),
  runTask: (id: string) =>
    post<{ status: string }>(`/tasks/${id}/run`, {}),
  bootstrap: (data: { path: string; id: string; name: string }) =>
    post<{ project: Project }>('/bootstrap', data),
  auditProject: (projectId: string) =>
    post<AuditResult>(`/projects/${projectId}/audit`, {}),
  auditApply: (projectId: string, taskIds: string[]) =>
    post<{ updated: string[]; count: number }>(`/projects/${projectId}/audit/apply`, { task_ids: taskIds }),
  patchTask: (id: string, data: { status?: string; execution_mode?: string; priority?: number; route_type?: string; title?: string; brief_text?: string; acceptance_criteria?: string }) =>
    patch<Task>(`/tasks/${id}`, data),
  patchProject: (id: string, data: { execution_mode?: string; autocommit_enabled?: boolean; auto_test_enabled?: boolean; worktrees_enabled?: boolean; obsidian_vault_path?: string; deploy_command?: string; test_command?: string; project_type?: string; ssh_host?: string; ssh_user?: string; ssh_key_path?: string; ssh_proxy_jump?: string; deploy_host?: string; deploy_path?: string; deploy_runtime?: string; deploy_restart_cmd?: string }) =>
    patch<Project>(`/projects/${id}`, data),
  deployProject: (projectId: string) =>
    post<DeployResult>(`/projects/${projectId}/deploy`, {}),
  syncObsidian: (projectId: string) =>
    post<ObsidianSyncResult>(`/projects/${projectId}/sync/obsidian`, {}),
  deleteProject: (id: string) =>
    del<void>(`/projects/${id}`),
  deleteDecision: (projectId: string, decisionId: number) =>
    del<{ deleted: number }>(`/projects/${projectId}/decisions/${decisionId}`),
  createDecision: (data: { project_id: string; type: string; title: string; description: string; category?: string; tags?: string[] }) =>
    post<Decision>('/decisions', data),
  newProject: (data: NewProjectPayload) =>
    post<NewProjectResult>('/projects/new', data),
  getPhases: (projectId: string) =>
    get<Phase[]>(`/projects/${projectId}/phases`),
  notifications: (projectId?: string) =>
    get<EscalationNotification[]>(`/notifications${projectId ? `?project_id=${projectId}` : ''}`),
  approvePhase: (phaseId: number, comment?: string) =>
    post<{ phase: Phase; next_phase: Phase | null }>(`/phases/${phaseId}/approve`, { comment }),
  rejectPhase: (phaseId: number, reason: string) =>
    post<Phase>(`/phases/${phaseId}/reject`, { reason }),
  revisePhase: (phaseId: number, comment: string) =>
    post<{ phase: Phase; new_task: Task }>(`/phases/${phaseId}/revise`, { comment }),
  startPhase: (projectId: string) =>
    post<{ status: string; phase_id: number; task_id: string }>(`/projects/${projectId}/phases/start`, {}),
  environments: (projectId: string) =>
    get<ProjectEnvironment[]>(`/projects/${projectId}/environments`),
  createEnvironment: (projectId: string, data: { name: string; host: string; port?: number; username: string; auth_type?: string; auth_value?: string; is_installed?: boolean }) =>
    post<ProjectEnvironment & { scan_task_id?: string }>(`/projects/${projectId}/environments`, data),
  updateEnvironment: (projectId: string, envId: number, data: { name?: string; host?: string; port?: number; username?: string; auth_type?: string; auth_value?: string; is_installed?: boolean }) =>
    patch<ProjectEnvironment & { scan_task_id?: string }>(`/projects/${projectId}/environments/${envId}`, data),
  deleteEnvironment: (projectId: string, envId: number) =>
    del<void>(`/projects/${projectId}/environments/${envId}`),
  scanEnvironment: (projectId: string, envId: number) =>
    post<{ status: string; task_id: string }>(`/projects/${projectId}/environments/${envId}/scan`, {}),
  chatHistory: (projectId: string, limit = 50) =>
    get<ChatMessage[]>(`/projects/${projectId}/chat?limit=${limit}`),
  sendChatMessage: (projectId: string, content: string) =>
    post<ChatSendResult>(`/projects/${projectId}/chat`, { content }),
  uploadAttachment: (taskId: string, file: File) => {
    const fd = new FormData()
    fd.append('file', file)
    return postForm<Attachment>(`/tasks/${taskId}/attachments`, fd)
  },
  getAttachments: (taskId: string) =>
    get<Attachment[]>(`/tasks/${taskId}/attachments`),
  deleteAttachment: (taskId: string, id: number) =>
    del<void>(`/tasks/${taskId}/attachments/${id}`),
  attachmentUrl: (id: number) => `${BASE}/attachments/${id}/file`,
  getPipelineLogs: (pipelineId: string, sinceId: number) =>
    get<PipelineLog[]>(`/pipelines/${pipelineId}/logs?since_id=${sinceId}`),
  projectLinks: (projectId: string) =>
    get<ProjectLink[]>(`/projects/${projectId}/links`),
  createProjectLink: (data: { from_project: string; to_project: string; type: string; description?: string }) =>
    post<ProjectLink>('/project-links', data),
  deleteProjectLink: (id: number) =>
    del<void>(`/project-links/${id}`),
}