import { Injectable } from '@nestjs/common';
import { AppError } from '../common/errors/app-error';
import { redactSensitive } from '../common/security/redact-sensitive';
import { AuditService } from '../audit/audit.service';
import {
  DeployNotificationEvent,
  DeployNotificationService,
} from '../notifications/wecom/deploy-notification.service';
import {
  ProjectEnvironmentSummary,
  ProjectSummary,
} from '../projects/project.types';
import { ProjectsService } from '../projects/projects.service';
import { DeployExecutionService } from './deploy-execution.service';
import { DeployRunRepository } from './deploy-run.repository';
import {
  CreateDeployRunInput,
  DeployRunJenkinsSyncSummary,
  DeployRunSummary,
} from './deploy-run.types';

@Injectable()
export class DeployRunsService {
  constructor(
    private readonly deployRunRepository: DeployRunRepository,
    private readonly projectsService: ProjectsService,
    private readonly auditService: AuditService,
    private readonly deployNotificationService: DeployNotificationService,
    private readonly deployExecutionService: DeployExecutionService,
  ) {}

  async listRuns(): Promise<DeployRunSummary[]> {
    return this.deployRunRepository.findMany();
  }

  async getRun(id: string): Promise<DeployRunSummary> {
    const run = await this.deployRunRepository.findById(id);

    if (!run) {
      throw new AppError(
        'RESOURCE_NOT_FOUND',
        `Deploy run ${id} not found`,
        404,
        {
          id,
        },
      );
    }

    return run;
  }

  async createRun(input: CreateDeployRunInput): Promise<DeployRunSummary> {
    if (!['test', 'production'].includes(input.environment)) {
      throw new AppError(
        'VALIDATION_FAILED',
        'environment must be test or production',
        400,
        { environment: input.environment },
      );
    }

    const project = await this.projectsService.getProject(input.projectKey);
    this.validateReleaseRequest(input, project);
    const run = await this.deployRunRepository.create(input);

    this.auditService.record({
      action: 'DEPLOY_REQUESTED',
      resourceType: 'deploy_run',
      resourceId: run.id,
      actorName: input.operator,
      after: {
        projectKey: input.projectKey,
        environment: input.environment,
        ref: input.ref,
        remark: input.remark,
      },
    });

    return this.deployExecutionService.execute(run, project);
  }

  async cancelRun(id: string): Promise<DeployRunSummary> {
    const run = await this.deployRunRepository.updateStatus(id, 'canceled');

    if (!run) {
      throw new AppError(
        'RESOURCE_NOT_FOUND',
        `Deploy run ${id} not found`,
        404,
        {
          id,
        },
      );
    }

    this.auditService.record({
      action: 'DEPLOY_CANCELED',
      resourceType: 'deploy_run',
      resourceId: run.id,
      after: {
        status: run.status,
      },
    });
    await this.recordNotificationResult(run, 'canceled');

    return run;
  }

  async retryRun(id: string): Promise<DeployRunSummary> {
    const source = await this.getRun(id);
    return this.createRun({
      projectKey: source.projectKey,
      environment: source.environment,
      ref: source.ref,
      operator: source.operator,
      remark: `Retry of ${source.id}`,
      idempotencyKey: `${source.id}:retry:${new Date().toISOString()}`,
      trigger: 'retry',
    });
  }

  async syncJenkinsRun(id: string): Promise<DeployRunSummary> {
    const run = await this.getRun(id);
    const project = await this.projectsService.getProject(run.projectKey);

    return this.deployExecutionService.syncJenkinsRun(run, project);
  }

  async syncJenkinsRuns(): Promise<DeployRunJenkinsSyncSummary> {
    const runs = await this.listRuns();
    const candidates = runs.filter((run) => this.isJenkinsSyncCandidate(run));
    const syncedRuns: DeployRunSummary[] = [];
    const failedRuns: DeployRunJenkinsSyncSummary['failedRuns'] = [];

    for (const run of candidates) {
      try {
        const project = await this.projectsService.getProject(run.projectKey);
        const syncedRun = await this.deployExecutionService.syncJenkinsRun(
          run,
          project,
        );
        syncedRuns.push(syncedRun);
      } catch (error) {
        failedRuns.push({
          id: run.id,
          projectKey: run.projectKey,
          message: this.toSafeSyncError(error),
        });
      }
    }

    this.auditService.record({
      action: 'JENKINS_SYNC_SWEEP_COMPLETED',
      resourceType: 'deploy_run',
      after: {
        totalCandidates: candidates.length,
        syncedCount: syncedRuns.length,
        failedCount: failedRuns.length,
      },
    });

    return {
      checkedAt: new Date().toISOString(),
      totalCandidates: candidates.length,
      syncedRuns,
      failedRuns,
    };
  }

  private async recordNotificationResult(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): Promise<void> {
    const notification =
      await this.deployNotificationService.sendDeployRunEvent(run, event);

    this.auditService.record({
      action: `DEPLOY_NOTIFICATION_${notification.status.toUpperCase()}`,
      resourceType: 'deploy_run',
      resourceId: run.id,
      after: {
        event,
        channel: notification.channel,
        reason: notification.reason,
      },
    });
  }

  private isJenkinsSyncCandidate(run: DeployRunSummary): boolean {
    return (
      ['queued', 'running'].includes(run.status) &&
      Boolean(run.jenkinsQueueId || run.jenkinsBuildNumber)
    );
  }

  private validateReleaseRequest(
    input: CreateDeployRunInput,
    project: ProjectSummary,
  ): ProjectEnvironmentSummary {
    if (project.status !== 'active') {
      this.recordDeployRejected(input, 'Project is archived');
      throw new AppError(
        'VALIDATION_FAILED',
        `Project ${project.key} is archived and cannot be deployed`,
        400,
        { projectKey: project.key },
      );
    }

    const environment = project.environments.find(
      (item) => item.name === input.environment,
    );

    if (!environment) {
      this.recordDeployRejected(input, 'Environment is not configured');
      throw new AppError(
        'VALIDATION_FAILED',
        `Project ${project.key} does not expose ${input.environment} environment`,
        400,
        { projectKey: project.key, environment: input.environment },
      );
    }

    if (!new RegExp(environment.refPattern).test(input.ref)) {
      this.recordDeployRejected(input, 'Ref does not match release policy');
      throw new AppError(
        'VALIDATION_FAILED',
        `Ref ${input.ref} does not match ${environment.releasePolicy} release policy`,
        400,
        {
          projectKey: project.key,
          environment: input.environment,
          ref: input.ref,
          releasePolicy: environment.releasePolicy,
          refPattern: environment.refPattern,
        },
      );
    }

    return environment;
  }

  private recordDeployRejected(
    input: CreateDeployRunInput,
    reason: string,
  ): void {
    this.auditService.record({
      action: 'DEPLOY_REJECTED',
      resourceType: 'deploy_run',
      actorName: input.operator,
      after: {
        projectKey: input.projectKey,
        environment: input.environment,
        ref: input.ref,
        reason,
      },
    });
  }

  private toSafeSyncError(error: unknown): string {
    const message =
      error instanceof Error ? error.message : 'Jenkins sync failed';

    return redactSensitive({ message }).message;
  }
}