package agent

import (
	"sort"
	"strings"
)

func resolveAgentToolAllowlist(definition AgentContextDefinition) []string {
	if frontmatterParseFailed(definition) {
		return []string{}
	}
	if definition.Agent == nil || definition.Agent.Frontmatter.Tools == nil {
		return nil
	}

	allowlist := make(map[string]struct{}, len(definition.Agent.Frontmatter.Tools))
	for _, raw := range definition.Agent.Frontmatter.Tools {
		trimmed := strings.ToLower(strings.TrimSpace(raw))
		if trimmed == "" {
			continue
		}
		allowlist[trimmed] = struct{}{}
	}

	result := make([]string, 0, len(allowlist))
	for name := range allowlist {
		result = append(result, name)
	}
	sort.Strings(result)
	return result
}

func resolveAgentMCPServerAllowlist(definition AgentContextDefinition) map[string]struct{} {
	if frontmatterParseFailed(definition) {
		return map[string]struct{}{}
	}
	if definition.Agent == nil || definition.Agent.Frontmatter.MCPServers == nil {
		return nil
	}

	allowlist := make(map[string]struct{}, len(definition.Agent.Frontmatter.MCPServers))
	for _, raw := range definition.Agent.Frontmatter.MCPServers {
		trimmed := strings.ToLower(strings.TrimSpace(raw))
		if trimmed == "" {
			continue
		}
		allowlist[trimmed] = struct{}{}
	}

	return allowlist
}

func frontmatterParseFailed(definition AgentContextDefinition) bool {
	if definition.Agent == nil {
		return false
	}
	if strings.TrimSpace(definition.Agent.RawFrontmatter) == "" {
		return false
	}
	return strings.TrimSpace(definition.Agent.FrontmatterErr) != ""
}