// OGraph API client - v2.4 Event-Sourced API
import { loadConfig } from './config.js'

// ─── Types ─────────────────────────────────────────────────────────────────────

export interface ObjectDef {
  name: string
  created_at?: number
}

export interface ObjectInstance {
  id: number
  type: string
  created_at?: number
}

export interface EventDefProperty {
  type: 'ref' | 'string' | 'number' | 'boolean'
  object_type?: string
}

export interface EventDef {
  name: string
  hash?: string
  schema: { properties: Record<string, EventDefProperty> }
  created_at?: number
}

export interface OEvent {
  id: number
  type_hash: string
  payload: Record<string, unknown>
  created_at?: number
}

export interface ProjectionDefSource {
  event_def: string
  bindings: Record<string, string>
  expression: string
}

export interface ProjectionDef {
  name: string
  sources?: ProjectionDefSource[]
  params?: Record<string, { type: 'ref'; object_type?: string }>
  value_schema?: { type: string }
  initial_value?: unknown
}

export interface Reaction {
  id: number
  projection_def_hash: string
  params_hash: string
  params: Record<string, unknown>
  action: 'webhook' | 'emit_event' | 'handler'
  webhook_url?: string
  emit_event_type?: string
  emit_payload_template?: string
  handler_code?: string
  handler_timeout_ms?: number
  created_at: number
}

export interface ApiKey {
  id: number
  name: string
  prefix: string
  allowed_events?: string[]
  rate_limit?: number
  created_at: number
}

export interface ReactionLog {
  id: number
  reaction_id: number
  event_id: number
  status: string
  created_at: number
}

export interface RequestLog {
  id: number
  api_key_id: number
  method: string
  path: string
  status: number
  created_at: number
}

export interface EmitEventResponse {
  event: OEvent
  reactions_fired: number
}

export interface HealthResponse {
  status: string
  version: string
}

// ─── Client Class ──────────────────────────────────────────────────────────────

export class OGraphClient {
  private endpoint?: string
  private token?: string

  async init(): Promise<void> {
    const config = await loadConfig()
    this.endpoint = config.endpoint
    this.token = config.token

    if (!this.endpoint) {
      throw new Error('API endpoint not configured. Run: ograph config set endpoint <url>')
    }
    if (!this.token) {
      throw new Error('Auth token not configured. Run: ograph config set token <token>')
    }
  }

  private async request<T>(path: string, options: RequestInit = {}, retries = 2): Promise<T> {
    const url = `${this.endpoint}${path}`

    const headers = new Headers(options.headers)
    headers.set('Authorization', `Bearer ${this.token}`)
    if (options.body && !headers.has('Content-Type')) {
      headers.set('Content-Type', 'application/json')
    }

    let lastError: Error | undefined
    for (let attempt = 0; attempt <= retries; attempt++) {
      try {
        const response = await fetch(url, { ...options, headers })

        // CF 1042 returns 404 with HTML — detect and retry
        const contentType = response.headers.get('content-type') ?? ''
        if (!contentType.includes('application/json')) {
          const text = await response.text()
          if (text.includes('1042') || text.includes('DOCTYPE')) {
            lastError = new Error('Worker not reachable (CF 1042 — edge propagation delay)')
            if (attempt < retries) {
              await new Promise((r) => setTimeout(r, 2000 * (attempt + 1)))
              continue
            }
            throw lastError
          }
          throw new Error(`Unexpected response: ${text.slice(0, 100)}`)
        }

        const result = await response.json()

        if (!response.ok) {
          if (response.status === 401) {
            throw new Error('Authentication failed. Check your token.')
          }
          const errorMessage =
            (result as { error?: string }).error ?? `HTTP ${response.status}: ${response.statusText}`
          throw new Error(errorMessage)
        }

        return result as T
      } catch (error) {
        if (error instanceof Error && error.message.includes('fetch')) {
          throw new Error(`Cannot reach OGraph API at ${this.endpoint}`)
        }
        // Retry on CF 1042 / propagation errors
        if (error instanceof Error && error.message.includes('1042') && attempt < retries) {
          await new Promise((r) => setTimeout(r, 2000 * (attempt + 1)))
          lastError = error
          continue
        }
        throw error
      }
    }
    throw lastError ?? new Error('Request failed after retries')
  }

  // ─── Object-Defs ───────────────────────────────────────────────────────────────

  async listObjectDefs(): Promise<ObjectDef[]> {
    const res = await this.request<{ object_defs: ObjectDef[] }>('/object-defs')
    return res.object_defs
  }

  async createObjectDef(name: string): Promise<ObjectDef> {
    return this.request<ObjectDef>('/object-defs', {
      method: 'POST',
      body: JSON.stringify({ name }),
    })
  }

  // ─── Objects ───────────────────────────────────────────────────────────────────

  async createObject(type: string): Promise<ObjectInstance> {
    return this.request<ObjectInstance>('/objects', {
      method: 'POST',
      body: JSON.stringify({ type }),
    })
  }

  async getObject(id: number): Promise<ObjectInstance> {
    return this.request<ObjectInstance>(`/objects/${id}`)
  }

  async listObjects(type?: string): Promise<ObjectInstance[]> {
    const path = type ? `/objects?type=${encodeURIComponent(type)}` : '/objects'
    const res = await this.request<{ objects: ObjectInstance[] }>(path)
    return res.objects
  }

  // ─── Event-Defs ───────────────────────────────────────────────────────────────

  async listEventDefs(): Promise<EventDef[]> {
    const res = await this.request<{ event_defs: EventDef[] }>('/event-defs')
    return res.event_defs
  }

  async createEventDef(name: string, schema: { properties: Record<string, EventDefProperty> }): Promise<EventDef> {
    return this.request<EventDef>('/event-defs', {
      method: 'POST',
      body: JSON.stringify({ name, schema }),
    })
  }

  // ─── Events ────────────────────────────────────────────────────────────────────

  async emitEvent(type: string, payload: Record<string, unknown>): Promise<EmitEventResponse> {
    return this.request<EmitEventResponse>('/events', {
      method: 'POST',
      body: JSON.stringify({ type, payload }),
    })
  }

  async getEvent(id: number): Promise<OEvent> {
    return this.request<OEvent>(`/events/${id}`)
  }

  async findEventsByRef(ref: number): Promise<OEvent[]> {
    const res = await this.request<{ events: OEvent[] }>(`/events?ref=${ref}`)
    return res.events
  }

  // ─── Projection-Defs ──────────────────────────────────────────────────────────

  async listProjectionDefs(): Promise<ProjectionDef[]> {
    const res = await this.request<{ projection_defs: ProjectionDef[] }>('/projection-defs')
    return res.projection_defs
  }

  async createProjectionDef(
    name: string,
    sources: ProjectionDefSource[],
    params: Record<string, { type: 'ref'; object_type?: string }>,
    value_schema: { type: string },
    initial_value: unknown,
  ): Promise<ProjectionDef> {
    return this.request<ProjectionDef>('/projection-defs', {
      method: 'POST',
      body: JSON.stringify({ name, sources, params, value_schema, initial_value }),
    })
  }

  // ─── Projections ──────────────────────────────────────────────────────────────

  async getProjection(name: string, params?: Record<string, string>): Promise<unknown> {
    const qs = params && Object.keys(params).length > 0 ? '?' + new URLSearchParams(params).toString() : ''
    const res = await this.request<{ value: unknown }>(`/projections/${encodeURIComponent(name)}${qs}`)
    return res.value
  }

  // ─── Reactions ────────────────────────────────────────────────────────────────

  async createReaction(
    projectionDef: string,
    params: Record<string, unknown>,
    options: {
      action?: 'webhook' | 'emit_event' | 'handler'
      webhook_url?: string
      emit_event_type?: string
      emit_payload_template?: string
      handler_code?: string
      handler_timeout_ms?: number
    },
  ): Promise<Reaction> {
    const action = options.action ?? 'webhook'
    return this.request<Reaction>('/reactions', {
      method: 'POST',
      body: JSON.stringify({
        projection_def: projectionDef,
        params,
        action,
        webhook_url: options.webhook_url,
        emit_event_type: options.emit_event_type,
        emit_payload_template: options.emit_payload_template,
        handler_code: options.handler_code,
        handler_timeout_ms: options.handler_timeout_ms,
      }),
    })
  }

  async listReactions(): Promise<Reaction[]> {
    const res = await this.request<{ reactions: Reaction[] }>('/reactions')
    return res.reactions
  }

  async deleteReaction(id: number): Promise<{ ok: boolean }> {
    return this.request<{ ok: boolean }>(`/reactions/${id}`, { method: 'DELETE' })
  }

  // ─── Reaction Logs ─────────────────────────────────────────────────────────

  async listReactionLogs(
    limit?: number,
    offset?: number,
    reactionId?: number,
  ): Promise<{ reaction_logs: ReactionLog[]; total: number }> {
    const params = new URLSearchParams()
    if (limit !== undefined) params.set('limit', String(limit))
    if (offset !== undefined) params.set('offset', String(offset))
    if (reactionId !== undefined) params.set('reaction_id', String(reactionId))
    const qs = params.toString()
    return this.request<{ reaction_logs: ReactionLog[]; total: number }>(
      `/reaction-logs${qs ? `?${qs}` : ''}`,
    )
  }

  // ─── Request Logs ─────────────────────────────────────────────────────────────

  async listRequestLogs(
    limit?: number,
    offset?: number,
    apiKeyId?: number,
  ): Promise<{ request_logs: RequestLog[]; total: number }> {
    const params = new URLSearchParams()
    if (limit !== undefined) params.set('limit', String(limit))
    if (offset !== undefined) params.set('offset', String(offset))
    if (apiKeyId !== undefined) params.set('api_key_id', String(apiKeyId))
    const qs = params.toString()
    return this.request<{ request_logs: RequestLog[]; total: number }>(
      `/request-logs${qs ? `?${qs}` : ''}`,
    )
  }

  // ─── API Keys ─────────────────────────────────────────────────────────────────

  async createApiKey(
    name: string,
    allowedEvents?: string[],
    rateLimit?: number,
  ): Promise<{ api_key: ApiKey; plaintext_key: string }> {
    const body: Record<string, unknown> = { name }
    if (allowedEvents) body.allowed_events = allowedEvents
    if (rateLimit !== undefined) body.rate_limit = rateLimit
    return this.request<{ api_key: ApiKey; plaintext_key: string }>('/api-keys', {
      method: 'POST',
      body: JSON.stringify(body),
    })
  }

  async listApiKeys(
    limit?: number,
    offset?: number,
  ): Promise<{ api_keys: ApiKey[]; total: number }> {
    const params = new URLSearchParams()
    if (limit !== undefined) params.set('limit', String(limit))
    if (offset !== undefined) params.set('offset', String(offset))
    const qs = params.toString()
    return this.request<{ api_keys: ApiKey[]; total: number }>(
      `/api-keys${qs ? `?${qs}` : ''}`,
    )
  }

  async deleteApiKey(id: number): Promise<{ deleted: number }> {
    return this.request<{ deleted: number }>(`/api-keys/${id}`, { method: 'DELETE' })
  }

  // ─── Schema ────────────────────────────────────────────────────────────────────

  async getSchema(): Promise<{ object_defs: ObjectDef[]; event_defs: EventDef[]; projection_defs: ProjectionDef[] }> {
    return this.request<{ object_defs: ObjectDef[]; event_defs: EventDef[]; projection_defs: ProjectionDef[] }>('/schema')
  }

  // ─── Health ────────────────────────────────────────────────────────────────────

  async health(): Promise<HealthResponse> {
    return this.request<HealthResponse>('/health')
  }
}