import { Component, ElementRef, Input, OnDestroy, OnInit, ViewChild } from '@angular/core';
import { MatTable, MatTableModule } from '@angular/material/table';
import { MatIconModule } from '@angular/material/icon';
import EventService from '../shared/services/EventService';
import { Policy } from '../shared/models/policy';
import { Subscription } from 'rxjs';
import { FormsModule } from '@angular/forms';
import { HermesClientService } from '../hermes-client.service';

@Component({
    selector: 'policy-table',
    standalone: true,
    imports: [FormsModule, MatTableModule, MatIconModule],
    templateUrl: './policy-table.component.html',
    styleUrl: './policy-table.component.scss'
})
export class PolicyTableComponent implements OnInit, OnDestroy {
    @Input() policies: Policy[] = []
    displayedColumns = ['path', 'group', 'usage', 'span', 'actions']
    groups: { [id: string]: { id: string, name: string, priority: number } }

    @ViewChild(MatTable) table: MatTable<Policy>;
    private subscription: Subscription | undefined;

    constructor(private events: EventService, private hermes: HermesClientService) {
        this.table = {} as MatTable<Policy>;
        this.groups = {};
    }

    ngOnInit(): void {
        this.subscription = this.events.listen('addPolicy', (payload) => {
            if (!payload)
                return;
            if (this.policies.map(p => p.path).includes(payload)) {
                return;
            }

            this.policies.push(new Policy("", "", payload, 1, 5000, "", true, true));
            this.table.renderRows();
        });
        this.hermes.subscribe(4, (response: any) => {
            console.log('request received: ', response);
            if (response.request.type == "get_policies") {
                for (let policy of response.data) {
                    this.policies.push(new Policy(policy.id, policy.group_id, policy.path, policy.usage, policy.span, "", false, false));
                }
                this.table.renderRows();
            } else if (response.request.type == "create_policy") {
                console.log("create policy", response);
                const policy = this.policies.find(p => this.groups[response.data.group_id].name == p.temp_group_name && p.path == response.data.path);
                if (policy == null) {
                    this.policies.push(new Policy(response.data.id, response.data.group_id, response.data.path, response.data.usage, response.data.span));
                } else {
                    policy.id = response.data.id;
                    policy.group_id = response.data.group_id;
                    policy.editing = false;
                    policy.isNew = false;
                }
                this.table.renderRows();
            } else if (response.request.type == "update_policy") {
                console.log("update policy", response);
                const policy = this.policies.find(p => p.id == response.data.id);
                if (policy == null) {
                    this.policies.push(new Policy(response.data.id, response.data.group_id, response.data.path, response.data.usage, response.data.span));
                } else {
                    policy.id = response.data.id;
                    policy.group_id = response.data.group_id;
                    policy.editing = false;
                    policy.isNew = false;
                }
                this.table.renderRows();
            } else if (response.request.type == "delete_policy") {
                console.log('delete policy', response.request.data.id);
                const policy = this.policies.find(p => p.id == response.request.data.id);
                if (!policy) {
                    console.log('Could not find the policy by id. Already deleted.');
                    return;
                }
                const index = this.policies.indexOf(policy);
                if (index >= 0) {
                    this.policies.splice(index, 1);
                    this.table.renderRows();
                }
            } else if (response.request.type == "get_permissions") {
                this.groups = Object.assign({}, ...response.data.groups.map((g: any) => ({ [g.id]: g })));
            }
        });
        this.hermes.fetchPolicies();
        this.hermes.fetchPermissionsAndGroups();
    }

    ngOnDestroy(): void {
        if (this.subscription)
            this.subscription.unsubscribe();
    }

    cancel(policy: Policy) {
        if (!policy.editing)
            return;

        policy.path = policy.old_path ?? '';
        policy.usage = policy.old_usage ?? 1;
        policy.span = policy.old_span ?? 5000;
        policy.old_path = undefined;
        policy.old_span = undefined;
        policy.old_usage = undefined;
        policy.editing = false;
    }

    delete(policy: Policy) {
        this.hermes.deletePolicy(policy.id);
    }

    edit(policy: Policy) {
        policy.old_path = policy.path;
        policy.old_span = policy.span;
        policy.old_usage = policy.usage;
        policy.temp_group_name = this.groups[policy.group_id].name
        policy.editing = true;
    }

    save(policy: Policy) {
        if (!policy.temp_group_name) {
            console.log('group must be valid.');
            return;
        }
        const group = Object.values(this.groups).find(g => g.name);
        if (group == null) {
            console.log('group does not exist.');
            return;
        }

        if (isNaN(policy.usage)) {
            console.log('usage must be a whole number.');
            return;
        }
        if (policy.usage < 1 || policy.usage > 99) {
            console.error('usage must be between 1 and 99.');
            return;
        }
        if (policy.usage % 1.0 != 0) {
            console.error('usage must be a whole number.');
            return;
        }

        if (isNaN(policy.span)) {
            console.log('span must be a whole number.');
            return;
        }
        if (policy.span < 1000 || policy.span > 1800000) {
            console.error('span must be between 1 and 1800000.');
            return;
        }
        if (policy.span % 1.0 != 0) {
            console.error('span must be a whole number.');
            return;
        }

        let group_id = policy?.group_id;
        for (let groupId in this.groups) {
            if (this.groups[groupId].name == policy?.temp_group_name) {
                group_id = groupId;
                break;
            }
        }
        if (policy?.temp_group_name != this.groups[group_id].name) {
            console.log('no group found.');
            return;
        }

        if (policy.isNew) {
            this.hermes.createPolicy(group.id, policy.path, policy.usage, policy.span);
        } else {
            this.hermes.updatePolicy(policy.id, group.id, policy.path, policy.usage, policy.span);
        }
    }
}