# frozen_string_literal: true

require_relative 'base'
require_relative '../websocket_exec'
require 'optparse'

module PortainerCli
  module Commands
    # portainer-cli console <stack-name> <container-name> [--shell /bin/bash]
    #
    # Resolves the endpoint automatically from the stack, so the user never
    # needs to know or specify an endpoint ID.
    class Console
      include Base

      def initialize(config, client, debug: false)
        @config = config
        @client = client
        @debug  = debug
      end

      def run(args)
        opts = { shell: '/bin/sh' }
        OptionParser.new do |o|
          o.on('--shell SHELL', 'Shell to use (default: /bin/sh)') { |v| opts[:shell] = v }
        end.parse!(args)

        stack_name     = args.shift or error("Usage: portainer-cli console <stack> <container> [--shell /bin/bash]")
        container_name = args.shift or error("Usage: portainer-cli console <stack> <container> [--shell /bin/bash]")

        stack       = resolve_stack(stack_name)
        endpoint_id = stack['EndpointId']

        $stderr.puts dim("Stack: #{stack['Name']}  Endpoint: #{endpoint_id}")

        container_id = resolve_container(endpoint_id, container_name, stack['Name'])

        $stderr.puts dim("Connecting to #{container_name} (#{container_id[0, 12]})...")

        exec_id = create_exec(endpoint_id, container_id, opts[:shell])
        ws_url  = exec_websocket_url(exec_id, endpoint_id)

        send_resize(endpoint_id, exec_id) if $stdout.tty?
        trap('SIGWINCH') { send_resize(endpoint_id, exec_id) } if $stdout.tty?

        WebsocketExec.new(ws_url, @config.auth_header, ssl_verify: @config.ssl_verify, debug: @debug).run

        $stderr.puts dim("\r\nSession ended.")
      rescue PortainerCli::Client::ApiError => e
        error(e.message)
      rescue Interrupt
        $stderr.puts "\r\nInterrupted."
      end

      private

      def resolve_stack(name_or_id)
        stacks = @client.get('/api/stacks')
        match  = stacks.find do |s|
          s['Name'] == name_or_id || s['Id'].to_s == name_or_id
        end
        unless match
          available = stacks.map { |s| "  #{s['Id']}  #{s['Name']}" }.join("\n")
          error("Stack '#{name_or_id}' not found. Available stacks:\n#{available}")
        end
        match
      end

      def resolve_container(endpoint_id, name_or_id, stack_name = nil)
        containers = @client.get("/api/endpoints/#{endpoint_id}/docker/containers/json", all: 1)
        names_for  = ->(c) { Array(c['Names']).map { |n| n.delete_prefix('/') } }

        # 1. Exact match: full name or ID prefix
        exact = containers.find do |c|
          c['Id'].start_with?(name_or_id) ||
            names_for.(c).any? { |n| n == name_or_id }
        end
        return exact['Id'] if exact

        # 2. Compose-style match: "<stack>-<service>-<replica>"
        #    This is the most precise fuzzy match when we know the stack name.
        if stack_name
          composed = containers.select do |c|
            names_for.(c).any? { |n| n == "#{stack_name}-#{name_or_id}-1" || n.match?(/\A#{Regexp.escape(stack_name)}-#{Regexp.escape(name_or_id)}-\d+\z/) }
          end
          if composed.size == 1
            matched_name = names_for.(composed.first).first
            $stderr.puts dim("Matched '#{name_or_id}' → #{matched_name}")
            return composed.first['Id']
          end
        end

        # 3. Substring fallback (only within this stack's containers)
        stack_prefix = stack_name ? "#{stack_name}-" : nil
        pool = stack_prefix ? containers.select { |c| names_for.(c).any? { |n| n.start_with?(stack_prefix) } } : containers

        fuzzy = pool.select { |c| names_for.(c).any? { |n| n.include?(name_or_id) } }

        if fuzzy.size == 1
          matched_name = names_for.(fuzzy.first).first
          $stderr.puts dim("Matched '#{name_or_id}' → #{matched_name}")
          return fuzzy.first['Id']
        end

        if fuzzy.size > 1
          list = fuzzy.map { |c| "  #{c['Id'][0, 12]}  #{names_for.(c).first}" }.join("\n")
          error("Ambiguous container '#{name_or_id}'. Did you mean one of:\n#{list}")
        end

        available = pool.map { |c| "  #{c['Id'][0, 12]}  #{names_for.(c).first}" }.join("\n")
        error("Container '#{name_or_id}' not found. Available:\n#{available}")
      end

      def create_exec(endpoint_id, container_id, shell)
        result = @client.post(
          "/api/endpoints/#{endpoint_id}/docker/containers/#{container_id}/exec",
          {
            'AttachStdin'  => true,
            'AttachStdout' => true,
            'AttachStderr' => true,
            'Tty'          => true,
            'Cmd'          => [shell]
          }
        )
        result['Id']
      end

      def exec_websocket_url(exec_id, endpoint_id)
        token = @config.token || @config.api_key
        @client.websocket_url('/api/websocket/exec', token: token, id: exec_id, endpointId: endpoint_id)
      end

      def send_resize(endpoint_id, exec_id)
        rows, cols = $stdout.winsize
        @client.post(
          "/api/endpoints/#{endpoint_id}/docker/exec/#{exec_id}/resize",
          { 'h' => rows, 'w' => cols }
        )
      rescue StandardError
        # Non-fatal
      end
    end
  end
end