/**
 * 发布通知适配服务封装 provider 选择、outbox 记录和后端 webhook 投递。
 */
import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { redactSensitive } from '../../common/security/redact-sensitive';
import { EnvConfig } from '../../config/env.schema';
import { DeployRunSummary } from '../../deploy-runs/deploy-run.types';
import { NotificationOutboxService } from '../outbox/notification-outbox.service';
import { NotificationOutboxMessage } from '../outbox/notification-outbox.types';
import { WeComClient } from './wecom.client';

export type DeployNotificationEvent =
  | 'created'
  | 'queued'
  | 'succeeded'
  | 'failed'
  | 'canceled'
  | 'retried';

export type DeployNotificationResult = {
  status: 'sent' | 'skipped' | 'failed';
  channel: DeployNotificationProvider | 'none';
  reason?: string;
  outboxMessageId?: string;
};

export type DeployNotificationProvider = 'wecom' | 'feishu' | 'generic';

type DeployNotificationHealth = {
  status: 'ok' | 'not_configured' | 'unavailable';
  provider?: DeployNotificationProvider;
  message?: string;
};

/**
 * 统一封装发布单通知，保证 webhook 只存在于后端配置边界内。
 */
@Injectable()
export class DeployNotificationService {
  constructor(
    private readonly config: ConfigService<EnvConfig, true>,
    private readonly weComClient: WeComClient,
    private readonly notificationOutboxService: NotificationOutboxService,
  ) {}

  healthSummary(): DeployNotificationHealth {
    const provider = this.resolveProvider();

    if (!provider) {
      return {
        status: 'not_configured',
        message: '缺少 NOTIFICATION_PROVIDER',
      };
    }

    if (provider === 'wecom') {
      const health = this.weComClient.healthSummary();

      return {
        ...health,
        provider,
      };
    }

    const webhookKey = this.webhookKeyFor(provider);

    return this.config.get(webhookKey, { infer: true })
      ? { status: 'ok', provider }
      : {
          status: 'not_configured',
          provider,
          message: `缺少 ${webhookKey}`,
        };
  }

  async sendDeployRunEvent(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): Promise<DeployNotificationResult> {
    const health = this.healthSummary();
    const channel = health.provider ?? 'none';
    const outboxMessage = await this.createOutboxMessage(run, event, channel);

    if (health.status === 'not_configured') {
      await this.completeOutboxFailure(
        outboxMessage,
        health.message ?? '通知平台尚未配置',
      );

      return {
        status: 'skipped',
        channel,
        reason: health.message ?? '通知平台尚未配置',
        outboxMessageId: outboxMessage.id,
      };
    }

    if (health.status === 'unavailable' || !health.provider) {
      await this.completeOutboxFailure(
        outboxMessage,
        health.message ?? '通知平台不可用',
      );

      return {
        status: 'failed',
        channel,
        reason: health.message ?? '通知平台不可用',
        outboxMessageId: outboxMessage.id,
      };
    }

    try {
      await this.sendByProvider(health.provider, run, event);
      await this.notificationOutboxService.completeMessage(outboxMessage.id, {
        status: 'sent',
      });

      return {
        status: 'sent',
        channel: health.provider,
        outboxMessageId: outboxMessage.id,
      };
    } catch (error) {
      const reason =
        error instanceof Error
          ? redactSensitive({ message: error.message }).message
          : '未知通知错误';

      await this.completeOutboxFailure(outboxMessage, reason);

      return {
        status: 'failed',
        channel: health.provider,
        reason,
        outboxMessageId: outboxMessage.id,
      };
    }
  }

  private async createOutboxMessage(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
    channel: DeployNotificationProvider | 'none',
  ): Promise<NotificationOutboxMessage> {
    return this.notificationOutboxService.createMessage({
      deployRunId: run.id,
      channel,
      template: `deploy.${event}`,
      payload: this.outboxPayloadFor(run, event),
      idempotencyKey: this.outboxIdempotencyKey(run, event),
    });
  }

  private async completeOutboxFailure(
    message: NotificationOutboxMessage,
    reason: string,
  ): Promise<void> {
    await this.notificationOutboxService.completeMessage(message.id, {
      status: 'failed',
      lastError: reason,
    });
  }

  private resolveProvider(): DeployNotificationProvider | undefined {
    const provider = this.config
      .get('NOTIFICATION_PROVIDER', { infer: true })
      ?.toLowerCase();

    if (
      provider === 'wecom' ||
      provider === 'feishu' ||
      provider === 'generic'
    ) {
      return provider;
    }

    return undefined;
  }

  private webhookKeyFor(
    provider: Exclude<DeployNotificationProvider, 'wecom'>,
  ): 'FEISHU_WEBHOOK_URL' | 'NOTIFICATION_WEBHOOK_URL' {
    return provider === 'feishu'
      ? 'FEISHU_WEBHOOK_URL'
      : 'NOTIFICATION_WEBHOOK_URL';
  }

  private async sendByProvider(
    provider: DeployNotificationProvider,
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): Promise<void> {
    const title = this.titleFor(event);
    const markdown = this.markdownFor(run, event);

    if (provider === 'wecom') {
      await this.weComClient.sendMarkdown({
        title,
        markdown,
      });
      return;
    }

    if (provider === 'feishu') {
      await this.postWebhook(
        this.config.get('FEISHU_WEBHOOK_URL', { infer: true }) ?? '',
        {
          msg_type: 'text',
          content: {
            text: `${title}\n${this.plainTextFor(run, event)}`,
          },
        },
        provider,
      );
      return;
    }

    await this.postWebhook(
      this.config.get('NOTIFICATION_WEBHOOK_URL', { infer: true }) ?? '',
      {
        event: `deploy.${event}`,
        title,
        markdown,
        run: {
          id: run.id,
          projectKey: run.projectKey,
          environment: run.environment,
          ref: run.ref,
          status: run.status,
          operator: run.operator,
          jenkinsQueueId: run.jenkinsQueueId,
          jenkinsBuildNumber: run.jenkinsBuildNumber,
          failureSummary: run.failureSummary,
        },
        publicUrl: this.config.get('DEVOPS_PUBLIC_URL', { infer: true }),
      },
      provider,
    );
  }

  private async postWebhook(
    webhookUrl: string,
    body: unknown,
    provider: DeployNotificationProvider,
  ): Promise<void> {
    const response = await fetch(webhookUrl, {
      method: 'POST',
      headers: {
        'content-type': 'application/json',
      },
      body: JSON.stringify(body),
    });

    if (!response.ok) {
      throw new Error(`${provider} webhook 请求失败：${response.status}`);
    }
  }

  private titleFor(event: DeployNotificationEvent): string {
    if (event === 'canceled') {
      return 'DevOps 发布已取消';
    }

    if (event === 'queued') {
      return 'DevOps 发布已进入 Jenkins 队列';
    }

    if (event === 'succeeded') {
      return 'DevOps 发布成功';
    }

    if (event === 'failed') {
      return 'DevOps 发布失败';
    }

    if (event === 'retried') {
      return 'DevOps 发布已重试';
    }

    return 'DevOps 发布已创建';
  }

  private outboxPayloadFor(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): Record<string, unknown> {
    return {
      event: `deploy.${event}`,
      title: this.titleFor(event),
      deployRunId: run.id,
      projectKey: run.projectKey,
      environment: run.environment,
      ref: this.safeRefForOutbox(run.ref),
      status: run.status,
      operator: run.operator,
      jenkinsQueueId: run.jenkinsQueueId,
      jenkinsBuildNumber: run.jenkinsBuildNumber,
      failureSummary: run.failureSummary,
      publicUrl: this.config.get('DEVOPS_PUBLIC_URL', { infer: true }),
    };
  }

  private outboxIdempotencyKey(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): string {
    return [
      run.id,
      `deploy.${event}`,
      run.status,
      run.jenkinsBuildNumber ?? run.jenkinsQueueId ?? 'no-jenkins-ref',
    ].join(':');
  }

  private safeRefForOutbox(ref: string): string {
    if (/^[a-f0-9]{40}$/i.test(ref)) {
      return ref.slice(0, 12);
    }

    return ref.length > 48 ? `${ref.slice(0, 45)}...` : ref;
  }

  private markdownFor(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): string {
    return [
      `> 事件：${this.titleFor(event)}`,
      `> 项目：${run.projectKey}`,
      `> 环境：${run.environment}`,
      `> Ref：${run.ref}`,
      `> 状态：${run.status}`,
      `> 操作者：${run.operator}`,
      `> Run ID：${run.id}`,
      run.jenkinsQueueId ? `> Jenkins Queue：${run.jenkinsQueueId}` : undefined,
      run.jenkinsBuildNumber ? `> Jenkins Build：#${run.jenkinsBuildNumber}` : undefined,
      run.failureSummary ? `> 失败摘要：${run.failureSummary}` : undefined,
    ]
      .filter(Boolean)
      .join('\n');
  }

  private plainTextFor(
    run: DeployRunSummary,
    event: DeployNotificationEvent,
  ): string {
    return [
      `事件：${this.titleFor(event)}`,
      `项目：${run.projectKey}`,
      `环境：${run.environment}`,
      `Ref：${run.ref}`,
      `状态：${run.status}`,
      `操作者：${run.operator}`,
      `Run ID：${run.id}`,
      run.failureSummary ? `失败摘要：${run.failureSummary}` : undefined,
    ]
      .filter(Boolean)
      .join('\n');
  }
}