# shellcheck shell=bash
# shellcheck disable=SC2034

if ! validate_shell_type_and_version "bash" 4 &>/dev/null; then
  echo "redis_switchover_spec.sh skip all cases because dependency bash version 4 or higher is not installed."
  exit 0
fi

source ./utils.sh

common_library_file="./common.sh"
generate_common_library $common_library_file

Describe "Redis Switchover Script Tests"
  Include ../scripts/redis-switchover.sh
  Include $common_library_file

  init() {
    ut_mode="true"
  }
  BeforeAll "init"

  cleanup() {
    rm -f $common_library_file
  }
  AfterAll 'cleanup'

  Describe "Environment Check Tests"
    Context "check_environment_exist()"
      It "should fail when no required variables are set"
        unset SENTINEL_POD_FQDN_LIST REDIS_POD_FQDN_LIST REDIS_COMPONENT_NAME KB_SWITCHOVER_ROLE
        export COMPONENT_REPLICAS="2"
        When call check_environment_exist
        The status should be failure
        The stderr should include "Required environment variable SENTINEL_POD_FQDN_LIST is not set"
        The stdout should equal ""
      End

      It "should succeed with all required variables"
        export SENTINEL_POD_FQDN_LIST="sentinel1,sentinel2"
        export REDIS_POD_FQDN_LIST="redis1,redis2"
        export REDIS_COMPONENT_NAME="redis"
        export KB_SWITCHOVER_ROLE="primary"
        export COMPONENT_REPLICAS="2"
        When call check_environment_exist
        The status should be success
        The stdout should equal ""
        The stderr should equal ""
      End

#      It "should exit early when role is not primary"
#        export SENTINEL_POD_FQDN_LIST="sentinel1,sentinel2"
#        export REDIS_POD_FQDN_LIST="redis1,redis2"
#        export REDIS_COMPONENT_NAME="redis"
#        export KB_SWITCHOVER_ROLE="secondary"
#        When call check_environment_exist
#        The status should be success
#        The stdout should include "switchover not triggered for primary, nothing to do"
#        The stderr should equal ""
#      End
    End
  End

  Describe "Redis Operation Tests"
    Context "check_redis_role()"
      setup() {
        export REDIS_DEFAULT_PASSWORD="password123"
      }
      Before 'setup'

      cleanup() {
        unset REDIS_DEFAULT_PASSWORD
      }
      After 'cleanup'

      It "should identify primary role"
        redis-cli() {
          echo "# Replication
role:master
connected_slaves:2"
        }
        When call check_redis_role "localhost" "6379"
        The status should be success
        The output should equal "primary"
        The stderr should equal ""
      End

      It "should identify secondary role"
        redis-cli() {
          echo "# Replication
role:slave
master_host:redis-master"
        }
        When call check_redis_role "localhost" "6379"
        The status should be success
        The output should equal "secondary"
        The stderr should equal ""
      End

      It "should handle redis-cli failure"
        redis-cli() {
          return 1
        }
        When call check_redis_role "localhost" "6379"
        The status should be failure
        The stderr should include "Failed to get role info from localhost"
        The output should equal ""
      End

      It "should handle empty response"
        redis-cli() {
          echo ""
        }
        When call check_redis_role "localhost" "6379"
        The status should be failure
        The output should equal "unknown"
      End
    End

    Context "check_redis_kernel_status()"
      setup() {
        export REDIS_POD_FQDN_LIST="redis1,redis2,redis3"
        export SERVICE_PORT="6379"
      }
      Before 'setup'

      cleanup() {
        unset REDIS_POD_FQDN_LIST
        unset SERVICE_PORT
      }
      After 'cleanup'

      It "should detect single primary correctly"
        check_redis_role() {
          case "$1" in
            "redis1") echo "primary" ;;
            *) echo "secondary" ;;
          esac
        }
        When call check_redis_kernel_status
        The status should be success
        The output should equal "redis1"
        The stderr should equal ""
      End

      It "should fail when multiple primaries detected"
        check_redis_role() {
          echo "primary"
        }
        When call check_redis_kernel_status
        The status should be failure
        The stderr should include "Multiple primaries detected"
        The stdout should equal ""
      End

      It "should fail when no primary found"
        check_redis_role() {
          echo "secondary"
        }
        When call check_redis_kernel_status
        The status should be failure
        The stderr should include "No primary found"
        The stdout should equal ""
      End
    End

    Context "execute_sub_command()"
      It "should succeed with OK response"
        redis-cli() {
          echo "OK"
        }
        When call execute_sub_command "localhost" "6379" "password" "PING"
        The status should be success
        The stdout should include "Command executed successfully"
        The stderr should equal ""
      End

      It "should fail with non-OK response"
        redis-cli() {
          echo "ERROR"
        }
        When call execute_sub_command "localhost" "6379" "password" "PING"
        The status should be failure
        The stderr should include "Command failed"
        The stdout should include "ERROR"
      End

      It "should fail when redis-cli fails"
        redis-cli() {
          return 1
        }
        When call execute_sub_command "localhost" "6379" "password" "PING"
        The status should be failure
        The stderr should include "Command failed"
        The stdout should include "execute_sub_command output:"
      End
    End

    Context "execute_sentinel_failover()"
      setup() {
        export SENTINEL_POD_FQDN_LIST="sentinel1,sentinel2"
        export SENTINEL_SERVICE_PORT="26379"
        export SENTINEL_PASSWORD="sentinel_pass"
      }
      Before 'setup'

      cleanup() {
        unset SENTINEL_POD_FQDN_LIST
        unset SENTINEL_SERVICE_PORT
        unset SENTINEL_PASSWORD
      }
      After 'cleanup'

      It "should succeed with first sentinel"
        execute_sub_command() {
          echo "OK"
          return 0
        }
        When call execute_sentinel_failover "redis"
        The status should be success
        The stdout should include "Sentinel failover started with sentinel1"
        The stderr should equal ""
      End

      It "should fail when all sentinels fail"
        execute_sub_command() {
          return 1
        }
        call_func_with_retry() {
          return 1
        }
        When call execute_sentinel_failover "redis"
        The status should be failure
        The stderr should include "All Sentinel failover attempts failed"
      End
    End
  End

  Describe "Switchover Tests"
    setup() {
      export REDIS_DEFAULT_PASSWORD="redis_pass"
      export SENTINEL_POD_FQDN_LIST="sentinel1,sentinel2"
      export REDIS_POD_FQDN_LIST="redis1,redis2,redis3"
      export KB_SWITCHOVER_CANDIDATE_FQDN="redis2"
      export REDIS_COMPONENT_NAME="redis"
      export SERVICE_PORT="6379"
      export KB_SWITCHOVER_ROLE="primary"
      export SENTINEL_SERVICE_PORT="26379"
      export SENTINEL_PASSWORD="sentinel_pass"
      export COMPONENT_REPLICAS="2"
      MOCK_RESPONSES=()
      RESPONSE_INDEX=0
    }
    Before 'setup'

    cleanup() {
      unset REDIS_DEFAULT_PASSWORD
      unset SENTINEL_POD_FQDN_LIST
      unset REDIS_POD_FQDN_LIST
      unset KB_SWITCHOVER_CANDIDATE_FQDN
      unset REDIS_COMPONENT_NAME
      unset SERVICE_PORT
      unset KB_SWITCHOVER_ROLE
      unset SENTINEL_SERVICE_PORT
      unset SENTINEL_PASSWORD
      unset MOCK_RESPONSES
      unset RESPONSE_INDEX
      unset COMPONENT_REPLICAS
    }
    After 'cleanup'

    Context "switchover_with_candidate()"
      It "should execute successful switchover"
        check_redis_role() {
          if [ "$1" = "redis2" ]; then
            echo "secondary"
          else
            echo "primary"
          fi
        }
        check_redis_kernel_status() { return 0; }
        set_redis_priorities() { return 0; }
        execute_sentinel_failover() { return 0; }
        check_switchover_result() { return 0; }
        recover_redis_priorities() { return 0; }

        When call switchover_with_candidate
        The status should be success
        The stdout should include "All Redis config set replica-priority recovered"
        The stderr should equal ""
      End

      It "should fail when candidate is primary"
        check_redis_role() {
          echo "primary"
        }
        When call switchover_with_candidate
        The status should be failure
        The stderr should include "not in secondary role"
        The stdout should equal ""
      End
    End

    Context "switchover_without_candidate()"
      It "should execute successful switchover"
        MOCK_RESPONSES=("redis1" "redis2")
        check_redis_kernel_status() {
          local response=${MOCK_RESPONSES[$RESPONSE_INDEX]}
          RESPONSE_INDEX=$((RESPONSE_INDEX + 1))
          echo "$response"
        }
        execute_sentinel_failover() { return 0;}
        check_switchover_result() { return 0; }
        When call switchover_without_candidate
        The status should be success
      End

      It "should fail when initial status check fails"
        check_redis_kernel_status() {
          return 1
        }
        When call switchover_without_candidate
        The status should be failure
        The stdout should equal ""
      End

      It "should fail when sentinel failover fails"
        check_redis_kernel_status() {
          echo "redis1"
        }
        execute_sentinel_failover() {
          return 1
        }
        When call switchover_without_candidate
        The status should be failure
        The stdout should equal ""
      End
    End

    Context "check_switchover_result()"
      It "should succeed when expected master is achieved"
        check_redis_kernel_status() {
          echo "redis2"
        }
        When call check_switchover_result "redis2" ""
        The status should be success
        The stdout should include "Switchover successful: redis2 is now master"
        The stderr should equal ""
      End

      It "should succeed when switched from initial master"
        check_redis_kernel_status() {
          echo "redis2"
        }
        When call check_switchover_result "" "redis1"
        The status should be success
        The stdout should include "Switchover successful: new master is redis2"
        The stderr should equal ""
      End

      It "should fail when neither expected nor initial master specified"
        check_redis_kernel_status() {
          echo "redis2"
        }
        When call check_switchover_result "" ""
        The status should be failure
        The stderr should include "Neither expected_master nor initial_master specified"
        The stdout should equal ""
      End
    End
  End
End