/*
Copyright © 2026 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package es

import (
	"context"
	"fmt"
	"log/slog"
	"maps"
	"slices"

	"codeberg.org/scip/esctl/pkg/cfg"
	"codeberg.org/scip/esctl/pkg/printer"
	"github.com/elastic/go-elasticsearch/v9/typedapi/types"
)

func RoleNames(conf *cfg.Config) ([]string, error) {
	res, err := conf.DefaultCluster.ES().Security.GetRole().
		Do(context.Background())
	if err != nil {
		return nil, fmt.Errorf("failed to get roles: %w", esErrorString(err))
	}

	return slices.Collect(maps.Keys(res)), nil
}

func RoleList(conf *cfg.Config) error {
	res, err := conf.DefaultCluster.ES().Security.GetRole().
		Do(context.Background())
	if err != nil {
		return fmt.Errorf("failed to get roles: %w", esErrorString(err))
	}

	slog.Debug("ES result", "roles", res)

	table := printer.NewTable(conf, 3, len(res))
	table.Addheaders("role", "index roles", "cluster roles")

	idx := 0
	for name, role := range res {
		table.Entries[idx] = []any{
			name,
			role.Cluster,
			role.Indices,
		}
		idx++
	}

	table.Sort()

	return table.Print()
}

func RoleShow(conf *cfg.Config, rolename string) error {
	res, err := conf.DefaultCluster.ES().Security.GetRole().
		Name(rolename).
		Do(context.Background())
	if err != nil {
		return fmt.Errorf("failed to get role: %w", esErrorString(err))
	}

	slog.Debug("ES result", "role", res)

	role, exists := res[rolename]
	if !exists {
		return fmt.Errorf("role %s does not exist", rolename)
	}

	if len(role.Indices) > 0 {
		if err := roleIndices(conf, role); err != nil {
			return err
		}

		fmt.Println()
	}

	if len(role.RemoteIndices) > 0 {
		if err := roleRemoteIndices(conf, role); err != nil {
			return err
		}

		fmt.Println()
	}

	if len(role.Cluster) > 0 {
		if err := roleClusters(conf, role); err != nil {
			return err
		}

		fmt.Println()
	}

	if len(role.RemoteCluster) > 0 {
		if err := roleRemoteClusters(conf, role); err != nil {
			return err
		}

		fmt.Println()
	}

	if len(role.Applications) > 0 {
		if err := roleApplications(conf, role); err != nil {
			return err
		}
	}

	return nil
}

func roleRemoteClusters(conf *cfg.Config, role types.Role) error {
	if len(role.RemoteCluster) == 0 {
		return nil
	}

	table := printer.NewTable(conf, 2, len(role.RemoteCluster))
	table.Addheaders("remote cluster", "privilege")

	idx := 0

	for _, priv := range role.RemoteCluster {
		perms := []string{}
		for _, perm := range priv.Privileges {
			perms = append(perms, perm.Name)
		}

		table.Entries[idx] = []any{priv.Clusters, perms}

		idx++
	}

	table.Sort()

	return table.Print()
}

func roleClusters(conf *cfg.Config, role types.Role) error {
	if len(role.Cluster) == 0 {
		return nil
	}

	table := printer.NewTable(conf, 1, len(role.Cluster))
	table.Addheaders("cluster rights")

	idx := 0
	for _, cluster := range role.Cluster {
		table.Entries[idx] = []any{cluster.Name}
		idx++
	}

	table.Sort()

	return table.Print()
}

func roleRemoteIndices(conf *cfg.Config, role types.Role) error {
	if len(role.RemoteIndices) == 0 {
		return nil
	}

	table := printer.NewTable(conf, 3, len(role.RemoteIndices))
	table.Addheaders("remote index names", "index permissions", "allow restricted")

	idx := 0

	for _, priv := range role.RemoteIndices {
		perms := []string{}
		for _, perm := range priv.Privileges {
			perms = append(perms, perm.Name)
		}

		table.Entries[idx] = []any{priv.Names, perms, *priv.AllowRestrictedIndices}

		idx++
	}

	table.Sort()

	return table.Print()
}

func roleIndices(conf *cfg.Config, role types.Role) error {
	if len(role.Indices) == 0 {
		return nil
	}

	table := printer.NewTable(conf, 3, len(role.Indices))
	table.Addheaders("index names", "index permissions", "allow restricted")

	idx := 0

	for _, priv := range role.Indices {
		perms := []string{}
		for _, perm := range priv.Privileges {
			perms = append(perms, perm.Name)
		}

		table.Entries[idx] = []any{priv.Names, perms, *priv.AllowRestrictedIndices}

		idx++
	}

	table.Sort()

	return table.Print()
}

func roleApplications(conf *cfg.Config, role types.Role) error {
	if len(role.Applications) == 0 {
		return nil
	}

	table := printer.NewTable(conf, 3, len(role.Applications))
	table.Addheaders("application", "privileges", "resources")

	idx := 0
	for _, priv := range role.Applications {
		table.Entries[idx] = []any{
			priv.Application,
			priv.Privileges,
			priv.Resources,
		}

		idx++
	}

	table.Sort()

	return table.Print()
}