import { Injectable } from '@nestjs/common';
import { CommandBus, QueryBus } from '@nestjs/cqrs';
import {
  ReleaseBurnupReadModel,
  ReleaseProgressReadModel,
  ReleaseReadModel,
} from '@task-stream/api/tracker/domain';
import { ArchiveReleaseCommand } from './commands/archive-release.command';
import { CommandResult } from './commands/command-result';
import { CreateReleaseCommand } from './commands/create-release.command';
import { PublishReleaseCommand } from './commands/publish-release.command';
import { UpdateReleaseCommand } from './commands/update-release.command';
import { WriteReleaseNotesCommand } from './commands/write-release-notes.command';
import { GetReleaseNotesDraftQuery } from './queries/get-release-notes-draft.query';
import { GetReleaseProgressQuery } from './queries/get-release-progress.query';
import { GetReleaseQuery } from './queries/get-release.query';
import { GetUpcomingReleasesQuery } from './queries/get-upcoming-releases.query';
import { GetReleaseBurnupQuery } from './queries/get-release-burnup.query';

interface ReleaseDetails {
  name?: string;
  description?: string | null;
  targetDate?: string | null;
}

@Injectable()
export class ReleasesService {
  constructor(
    private readonly commandBus: CommandBus,
    private readonly queryBus: QueryBus,
  ) {}

  create(
    actorId: string,
    input: ReleaseDetails & { projectId: string; name: string },
  ): Promise<CommandResult> {
    return this.commandBus.execute(
      new CreateReleaseCommand(
        actorId,
        input.projectId,
        input.name,
        input.description,
        input.targetDate,
      ),
    );
  }

  update(
    actorId: string,
    releaseId: string,
    changes: ReleaseDetails,
  ): Promise<CommandResult> {
    return this.commandBus.execute(
      new UpdateReleaseCommand(actorId, releaseId, changes),
    );
  }

  /** Ships the release; fails with unfinished tickets unless `force`. */
  publish(
    actorId: string,
    releaseId: string,
    force = false,
  ): Promise<CommandResult> {
    return this.commandBus.execute(
      new PublishReleaseCommand(actorId, releaseId, force),
    );
  }

  archive(actorId: string, releaseId: string): Promise<CommandResult> {
    return this.commandBus.execute(
      new ArchiveReleaseCommand(actorId, releaseId),
    );
  }

  findOne(
    viewerId: string | null,
    releaseId: string,
  ): Promise<ReleaseReadModel> {
    return this.queryBus.execute(new GetReleaseQuery(viewerId, releaseId));
  }

  /** Planned releases of all my projects, soonest target date first. */
  upcoming(viewerId: string, limit: number): Promise<ReleaseReadModel[]> {
    return this.queryBus.execute(new GetUpcomingReleasesQuery(viewerId, limit));
  }

  /** Writes the notes (null removes them); also after the release ships. */
  writeNotes(
    actorId: string,
    releaseId: string,
    notes: string | null,
  ): Promise<CommandResult> {
    return this.commandBus.execute(
      new WriteReleaseNotesCommand(actorId, releaseId, notes),
    );
  }

  /** A Markdown draft from the release's finished tickets (not saved). */
  notesDraft(viewerId: string | null, releaseId: string): Promise<string> {
    return this.queryBus.execute(
      new GetReleaseNotesDraftQuery(viewerId, releaseId),
    );
  }

  progress(
    viewerId: string | null,
    releaseId: string,
  ): Promise<ReleaseProgressReadModel> {
    return this.queryBus.execute(
      new GetReleaseProgressQuery(viewerId, releaseId),
    );
  }

  /** Scope vs finished tickets of the release, day by day. */
  burnup(
    viewerId: string | null,
    releaseId: string,
  ): Promise<ReleaseBurnupReadModel> {
    return this.queryBus.execute(
      new GetReleaseBurnupQuery(viewerId, releaseId),
    );
  }
}