import type { FastifyPluginAsync } from 'fastify'
import { repos } from '@evofw/db'
import {
  createPolicyRuleBodySchema,
  patchPolicyRuleBodySchema,
  reorderPolicyRulesBodySchema,
} from '@evofw/shared'
import { AppError } from '../plugins/error-handler.js'
import {
  resolveAndStoreHostnameRule,
  resolveHostnameToCidrs,
} from '../services/policy/resolve-hostname.js'
import type { AppConfig } from '../config.js'
import { auditMutation } from '../services/audit.js'
import { mapPolicyRule, mapPolicyRules } from '../services/row-mappers.js'
import { applyPagination } from '../services/pagination.js'

export const rulesRoutes: FastifyPluginAsync<{ config: AppConfig }> = async (
  app,
  opts,
) => {
  const { config } = opts

  app.get<{ Params: { id: string } }>(
    '/policy-sets/:id/rules',
    async (req) => {
      const s = repos.getPolicySet(app.db, req.params.id)
      if (!s) throw new AppError('NOT_FOUND', 'Policy set not found', 404)
      return {
        items: mapPolicyRules(repos.listPolicyRules(app.db, s.id), app.db),
      }
    },
  )

  app.get<{
    Querystring: { set_id?: string; agent_id?: string; limit?: string; offset?: string }
  }>('/rules', async (req) => {
    if (req.query.agent_id) {
      return {
        items: mapPolicyRules(
          repos.listPolicyRulesForAgent(app.db, req.query.agent_id),
          app.db,
        ),
      }
    }
    const paged = applyPagination(
      mapPolicyRules(repos.listPolicyRules(app.db, req.query.set_id), app.db),
      req.query,
    )
    return { items: paged.items, total: paged.total }
  })

  app.post('/rules', async (req) => {
    const body = createPolicyRuleBodySchema.parse(req.body)
    const set = repos.getPolicySet(app.db, body.set_id)
    if (!set) throw new AppError('NOT_FOUND', 'Policy set not found', 404)

    const hostname = body.hostname?.trim() || null
    const cidr = body.cidr?.trim() || null
    const listId = body.list_id?.trim() || null

    if (hostname) {
      try {
        await resolveHostnameToCidrs(hostname)
      } catch (err) {
        throw new AppError(
          'VALIDATION_ERROR',
          err instanceof Error ? err.message : String(err),
          400,
        )
      }
    }

    if (listId && !repos.getIpList(app.db, listId)) {
      throw new AppError('NOT_FOUND', 'IP list not found', 404)
    }

    const priority =
      body.priority ?? repos.nextRulePriority(app.db, body.set_id)

    const id = crypto.randomUUID()
    const row = repos.insertPolicyRule(app.db, {
      id,
      setId: body.set_id,
      priority,
      action: body.action,
      enabled: body.enabled === false ? 0 : 1,
      listId,
      cidr,
      hostname,
      comment: body.comment ?? null,
      createdByUserId: req.authUser?.id,
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
    })

    if (hostname) {
      try {
        await resolveAndStoreHostnameRule(app.db, id, hostname)
      } catch (err) {
        repos.deletePolicyRule(app.db, id)
        throw new AppError(
          'VALIDATION_ERROR',
          err instanceof Error ? err.message : String(err),
          400,
        )
      }
    }

    repos.bumpAgentsForSet(app.db, body.set_id)
    auditMutation(app, config, req, {
      action: 'rule.create',
      targetType: 'app_resource',
      targetId: row!.id,
      summary: `Создано правило ${body.action} в наборе ${set.name}`,
      details: {
        rule_id: row!.id,
        set_id: body.set_id,
        action: body.action,
        priority,
      },
    })
    return mapPolicyRule(row!, app.db)
  })

  app.patch<{ Params: { id: string } }>('/rules/:id', async (req) => {
    const body = patchPolicyRuleBodySchema.parse(req.body)
    const rule = repos.getPolicyRule(app.db, req.params.id)
    if (!rule) throw new AppError('NOT_FOUND', 'Rule not found', 404)
    const updated = repos.updatePolicyRule(app.db, rule.id, {
      enabled: body.enabled === undefined ? undefined : body.enabled ? 1 : 0,
      action: body.action,
      comment: body.comment,
      priority: body.priority,
    })
    repos.bumpAgentsForSet(app.db, rule.setId)
    auditMutation(app, config, req, {
      action: 'rule.update',
      targetType: 'app_resource',
      targetId: rule.id,
      summary: `Обновлено правило ${rule.id}`,
      details: {
        rule_id: rule.id,
        set_id: rule.setId,
        enabled: body.enabled,
        action: body.action,
        priority: body.priority,
      },
    })
    return mapPolicyRule(updated!, app.db)
  })

  app.put<{ Params: { id: string } }>(
    '/policy-sets/:id/rules/reorder',
    async (req) => {
      const body = reorderPolicyRulesBodySchema.parse(req.body)
      const s = repos.getPolicySet(app.db, req.params.id)
      if (!s) throw new AppError('NOT_FOUND', 'Policy set not found', 404)
      try {
        repos.reorderPolicyRules(app.db, s.id, body.ordered_ids)
      } catch (err) {
        throw new AppError(
          'VALIDATION_ERROR',
          err instanceof Error ? err.message : String(err),
          400,
        )
      }
      repos.bumpAgentsForSet(app.db, s.id)
      auditMutation(app, config, req, {
        action: 'rule.reorder',
        targetType: 'app_resource',
        targetId: s.id,
        summary: `Порядок правил изменён в наборе ${s.name}`,
        details: { set_id: s.id, ordered_ids: body.ordered_ids },
      })
      return {
        items: mapPolicyRules(
          repos.listPolicyRules(app.db, s.id),
          app.db,
        ),
      }
    },
  )

  app.delete<{ Params: { id: string } }>('/rules/:id', async (req) => {
    const rule = repos.getPolicyRule(app.db, req.params.id)
    if (!rule) throw new AppError('NOT_FOUND', 'Rule not found', 404)
    repos.deletePolicyRule(app.db, req.params.id)
    repos.bumpAgentsForSet(app.db, rule.setId)
    auditMutation(app, config, req, {
      action: 'rule.delete',
      severity: 'warning',
      targetType: 'app_resource',
      targetId: rule.id,
      summary: `Правило удалено из набора ${rule.setId}`,
      details: { rule_id: rule.id, set_id: rule.setId },
    })
    return { ok: true }
  })
}