package acl

import (
	"testing"
)

func TestEmptyACL_AllowsEverything(t *testing.T) {
	a := FromMap(nil)
	if !a.Empty() {
		t.Fatal("expected empty ACL")
	}
	if !a.CanDo("@anyone:server", "anything") {
		t.Fatal("empty ACL should allow everything")
	}
}

func TestCanDo_AdminWildcard(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"admin": {
			Users:   []string{"@admin:server"},
			Actions: []string{"*"},
		},
	})

	if !a.CanDo("@admin:server", "command:deploy") {
		t.Fatal("admin should be able to do anything")
	}
	if a.CanDo("@user:server", "command:deploy") {
		t.Fatal("unknown user should be denied when roles are defined")
	}
}

func TestCanDo_SpecificActions(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"admin": {
			Users:   []string{"@admin:server"},
			Actions: []string{"*"},
		},
		"user": {
			Users:   []string{"*"},
			Actions: []string{"ask", "help", "command:help", "command:ping"},
		},
	})

	// Admin can do anything
	if !a.CanDo("@admin:server", "tool:ssh_command") {
		t.Fatal("admin should have wildcard access")
	}

	// Regular user can ask and use help
	if !a.CanDo("@random:server", "ask") {
		t.Fatal("wildcard user should be able to ask")
	}
	if !a.CanDo("@random:server", "command:help") {
		t.Fatal("wildcard user should be able to use help command")
	}

	// Regular user cannot use restricted tools
	if a.CanDo("@random:server", "tool:ssh_command") {
		t.Fatal("wildcard user should not access ssh tool")
	}
	if a.CanDo("@random:server", "command:deploy") {
		t.Fatal("wildcard user should not access deploy command")
	}
}

func TestCanDo_PrefixWildcard(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"ops": {
			Users:   []string{"@ops:server"},
			Actions: []string{"command:*", "tool:*"},
		},
	})

	if !a.CanDo("@ops:server", "command:deploy") {
		t.Fatal("command:* should match command:deploy")
	}
	if !a.CanDo("@ops:server", "tool:ssh_command") {
		t.Fatal("tool:* should match tool:ssh_command")
	}
	if a.CanDo("@ops:server", "ask") {
		t.Fatal("command:*/tool:* should not match 'ask'")
	}
}

func TestRoleFor_ExactBeforeWildcard(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"admin": {
			Users:   []string{"@admin:server"},
			Actions: []string{"*"},
		},
		"user": {
			Users:   []string{"*"},
			Actions: []string{"ask"},
		},
	})

	if role := a.RoleFor("@admin:server"); role != "admin" {
		t.Fatalf("expected admin, got %q", role)
	}
	if role := a.RoleFor("@random:server"); role != "user" {
		t.Fatalf("expected user, got %q", role)
	}
	if role := a.RoleFor("@nobody:other"); role != "user" {
		t.Fatalf("expected user for wildcard, got %q", role)
	}
}

func TestRoleFor_NoMatch(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"admin": {
			Users:   []string{"@admin:server"},
			Actions: []string{"*"},
		},
	})

	if role := a.RoleFor("@nobody:server"); role != "" {
		t.Fatalf("expected empty role, got %q", role)
	}
}

func TestAllowedUsers(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"admin": {
			Users:   []string{"@admin:server", "@root:server"},
			Actions: []string{"*"},
		},
		"user": {
			Users:   []string{"*", "@admin:server"}, // admin appears in both
			Actions: []string{"ask"},
		},
	})

	users := a.AllowedUsers()
	// Should contain @admin:server and @root:server, deduplicated, no "*"
	if len(users) != 2 {
		t.Fatalf("expected 2 users, got %d: %v", len(users), users)
	}

	found := make(map[string]bool)
	for _, u := range users {
		found[u] = true
	}
	if !found["@admin:server"] || !found["@root:server"] {
		t.Fatalf("unexpected users: %v", users)
	}
}

func TestCanDo_MultipleRolesForSameUser(t *testing.T) {
	a := FromMap(map[string]RoleDef{
		"viewer": {
			Users:   []string{"@user:server"},
			Actions: []string{"ask", "help"},
		},
		"deployer": {
			Users:   []string{"@user:server"},
			Actions: []string{"command:deploy"},
		},
	})

	// User has both roles, should be able to do actions from either
	if !a.CanDo("@user:server", "ask") {
		t.Fatal("user should be able to ask via viewer role")
	}
	if !a.CanDo("@user:server", "command:deploy") {
		t.Fatal("user should be able to deploy via deployer role")
	}
	if a.CanDo("@user:server", "tool:ssh_command") {
		t.Fatal("user should not have ssh access")
	}
}