package validator

import (
	"strings"

	"browser.local/platform/domain"
)

func ValidatePluginLifecycleInstallation(installation domain.PluginLifecycleInstallation) error {
	var violations []string
	violations = appendRequired(violations, "id", installation.ID)
	violations = appendRequired(violations, "pluginId", installation.PluginID)
	violations = appendRequired(violations, "serverInstanceId", installation.ServerInstanceID)
	if !validPluginLifecycleState(installation.DesiredState) {
		violations = append(violations, "desiredState is invalid")
	}
	if !validPluginLifecycleState(installation.CurrentState) {
		violations = append(violations, "currentState is invalid")
	}
	if installation.LastOperation != "" && !validPluginLifecycleOperation(installation.LastOperation) {
		violations = append(violations, "lastOperation is invalid")
	}
	for _, value := range []fieldString{{field: "compatibility", value: installation.Compatibility}, {field: "failureReason", value: installation.FailureReason}} {
		if len(value.value) > maxProductionMessageLength || unsafeProductionText(value.value) {
			violations = append(violations, value.field+" is unsafe")
		}
	}
	return finish(violations)
}

func ValidatePluginLifecycleRequest(request domain.PluginLifecycleRequest) error {
	var violations []string
	violations = appendRequired(violations, "pluginId", request.PluginID)
	violations = appendRequired(violations, "serverInstanceId", request.ServerInstanceID)
	violations = appendRequired(violations, "idempotencyKey", request.IdempotencyKey)
	if !validPluginLifecycleOperation(request.Operation) {
		violations = append(violations, "operation is invalid")
	}
	if (request.Operation == domain.PluginLifecycleOperationDisable || request.Operation == domain.PluginLifecycleOperationRollback || request.Operation == domain.PluginLifecycleOperationRetire) && !request.Confirmed {
		violations = append(violations, "confirmed is required for disruptive plugin lifecycle operation")
	}
	for _, value := range []fieldString{{field: "targetVersion", value: request.TargetVersion}, {field: "idempotencyKey", value: request.IdempotencyKey}} {
		if unsafeProductionText(value.value) {
			violations = append(violations, value.field+" is unsafe")
		}
	}
	return finish(violations)
}

func ValidateAIConfigDiffPreview(preview domain.AIConfigDiffPreview) error {
	var violations []string
	violations = appendRequired(violations, "id", preview.ID)
	violations = appendRequired(violations, "requestId", preview.RequestID)
	violations = appendRequired(violations, "createdBy", preview.CreatedBy)
	violations = appendRequired(violations, "serverInstanceId", preview.ServerInstanceID)
	violations = appendRequired(violations, "key", preview.Key)
	violations = appendRequired(violations, "diffSummary", preview.DiffSummary)
	if preview.ConfigVersion <= 0 {
		violations = append(violations, "configVersion must be positive")
	}
	if !validAIConfigDiffState(preview.State) {
		violations = append(violations, "state is invalid")
	}
	if !validLogicalFileKey(preview.Key) || !validConfigFileKey(preview.Key) {
		violations = append(violations, "key is invalid")
	}
	if len([]byte(preview.ProposedConfig)) > maxServerConfigContentSize || containsUnsafeRuntimeSecret(preview.ProposedConfig) || looksLikeRawHostPath(preview.ProposedConfig) {
		violations = append(violations, "proposedConfig is unsafe")
	}
	if len(preview.DiffSummary) > maxProductionMessageLength || unsafeProductionText(preview.DiffSummary) {
		violations = append(violations, "diffSummary is unsafe")
	}
	return finish(violations)
}

func ValidateAIConfigDiffApprovalRequest(request domain.AIConfigDiffApprovalRequest) error {
	var violations []string
	violations = appendRequired(violations, "diffId", request.DiffID)
	violations = appendRequired(violations, "idempotencyKey", request.IdempotencyKey)
	if unsafeProductionText(request.DiffID) || unsafeProductionText(request.IdempotencyKey) {
		violations = append(violations, "AI config approval request is unsafe")
	}
	return finish(violations)
}

func validPluginLifecycleState(state domain.PluginLifecycleState) bool {
	switch state {
	case domain.PluginLifecycleStatePending, domain.PluginLifecycleStateInstalled, domain.PluginLifecycleStateEnabled, domain.PluginLifecycleStateDisabled, domain.PluginLifecycleStateUpgrading, domain.PluginLifecycleStateRollingBack, domain.PluginLifecycleStateRetired, domain.PluginLifecycleStateFailed:
		return true
	default:
		return false
	}
}

func validPluginLifecycleOperation(operation domain.PluginLifecycleOperation) bool {
	switch operation {
	case domain.PluginLifecycleOperationInstall, domain.PluginLifecycleOperationEnable, domain.PluginLifecycleOperationDisable, domain.PluginLifecycleOperationUpgrade, domain.PluginLifecycleOperationRollback, domain.PluginLifecycleOperationRetire, domain.PluginLifecycleOperationDependencyCheck:
		return true
	default:
		return false
	}
}

func validAIConfigDiffState(state domain.AIConfigDiffState) bool {
	switch state {
	case domain.AIConfigDiffStatePending, domain.AIConfigDiffStateApproved, domain.AIConfigDiffStateCancelled, domain.AIConfigDiffStateExpired:
		return true
	default:
		return false
	}
}

func unsafeProductionText(value string) bool {
	lower := strings.ToLower(value)
	return containsUnsafeRuntimeSecret(value) ||
		looksLikeRawHostPath(value) ||
		strings.Contains(lower, "api key") ||
		strings.Contains(lower, "apikey") ||
		strings.Contains(lower, "provider base url") ||
		strings.Contains(lower, "direct run") ||
		strings.Contains(lower, "rcon password") ||
		strings.Contains(lower, "dsn=")
}