import type { AgentBrowserModule } from '../../agent-browser';
import type { CodingAttachmentStore } from '../../coding-projects/attachment-store';
import {
  ConversationChangeTracker,
  type ConversationChangesSnapshot,
} from '../../coding-projects/conversation-change-tracker';
import {
  buildProductCodingCommandCatalog,
  listProductCodingSkills,
} from '../../coding-projects/skill-registry';
import type {
  ProductCodingCommand,
  ProductCodingSkill,
  ProductPiCommandInput,
} from '../../../shared/coding-product-tools';
import {
  type ProductCodingPluginSkillSource,
} from '../../coding-projects/skill-registry';
import {
  type CodingCapabilityRegistry,
} from '../../coding-plugins/registry';
import type { EffectivePluginSnapshot } from '../../coding-plugins/effective-resolver';
import type { KnownToolDetails, RuntimeContextDetailsV1 } from '../contracts';
import { BUNDLED_CODING_SKILL_IDS } from '../../../shared/coding-skills';
import { PiAgentBrowserTool } from './extensions/agent-browser';
import { reportChangedFiles } from './extensions/changed-file';
import { projectTaskState } from './extensions/task-state';

export type PiProductToolName =
  | 'agent_browser'
  | 'task_state'
  | 'changed_file'
  | 'runtime_context';

const PI_PRODUCT_TOOL_NAMES = new Set<string>([
  'agent_browser',
  'task_state',
  'changed_file',
  'runtime_context',
]);

export function isPiProductToolName(value: unknown): value is PiProductToolName {
  return typeof value === 'string' && PI_PRODUCT_TOOL_NAMES.has(value);
}

export interface PiProductToolContext {
  conversationId: string;
  runId: string;
  resourceId: string;
  projectId: string;
  projectPath: string;
  skillIds: readonly string[];
  effectiveSnapshot?: EffectivePluginSnapshot;
}

export interface PiProductToolResult {
  content: Array<{ type: 'text'; text: string }>;
  details: KnownToolDetails;
}

export interface PiProductToolsOptions {
  browser: AgentBrowserModule;
  attachments: CodingAttachmentStore;
  bundledSkillsDir: string;
  changeTracker?: ConversationChangeTracker;
  pluginSkillSources?: readonly ProductCodingPluginSkillSource[];
  getPluginSkillSources?(): readonly ProductCodingPluginSkillSource[]
    | Promise<readonly ProductCodingPluginSkillSource[]>;
  capabilityRegistry?: CodingCapabilityRegistry;
}

export class PiProductTools {
  readonly changeTracker: ConversationChangeTracker;
  private readonly browser: PiAgentBrowserTool;
  private capabilityRegistry: CodingCapabilityRegistry | undefined;

  constructor(private readonly options: PiProductToolsOptions) {
    this.changeTracker = options.changeTracker ?? new ConversationChangeTracker();
    this.browser = new PiAgentBrowserTool(options.browser, options.attachments);
    this.capabilityRegistry = options.capabilityRegistry;
  }

  configureCapabilityRegistry(registry: CodingCapabilityRegistry): void {
    this.capabilityRegistry = registry;
  }

  beginRun(input: { conversationId: string; runId: string; projectPath: string }) {
    return this.changeTracker.beginRun(input);
  }

  settleRun(conversationId: string, runId: string) {
    return this.changeTracker.settleRun(conversationId, runId);
  }

  getChanges(conversationId: string): ConversationChangesSnapshot | null {
    return this.changeTracker.getSnapshot(conversationId);
  }

  async listSkills(
    skillIds: readonly string[],
    availablePluginSkillIds: readonly string[] = [],
  ): Promise<ProductCodingSkill[]> {
    const available = new Set(availablePluginSkillIds);
    const dynamicSources = this.options.getPluginSkillSources
      ? await this.options.getPluginSkillSources()
      : [];
    const uniqueSources = [...new Map(
      [...(this.options.pluginSkillSources ?? []), ...dynamicSources]
        .map((source) => [source.id, source] as const),
    ).values()];
    const sources = uniqueSources.map((source) => ({
      ...source,
      available: available.has(source.pluginId ?? source.id) || available.has(source.id),
    }));
    const selectedSkillIds = this.options.getPluginSkillSources
      ? skillIds.filter((id) => BUNDLED_CODING_SKILL_IDS.includes(id)
        || uniqueSources.some((source) => source.id === id))
      : skillIds;
    return listProductCodingSkills(this.options.bundledSkillsDir, selectedSkillIds, sources);
  }

  async listCommands(
    skillIds: readonly string[],
    piCommands: readonly ProductPiCommandInput[] = [],
    availablePluginSkillIds: readonly string[] = [],
  ): Promise<ProductCodingCommand[]> {
    return buildProductCodingCommandCatalog(
      await this.listSkills(skillIds, availablePluginSkillIds),
      piCommands,
    );
  }

  async markBash(conversationId: string, runId: string): Promise<void> {
    await this.changeTracker.markProjectRefresh(conversationId, runId);
  }

  recordTouchedPaths(conversationId: string, runId: string, paths: readonly string[]) {
    return this.changeTracker.recordTouchedPaths(conversationId, runId, paths);
  }

  async execute(
    toolName: PiProductToolName | string,
    context: PiProductToolContext,
    input: unknown,
  ): Promise<PiProductToolResult> {
    if (toolName === 'agent_browser') {
      return await this.browser.execute(context, input);
    }
    if (toolName === 'task_state') return projectTaskState(input);
    if (toolName === 'changed_file') {
      return await reportChangedFiles(this.changeTracker, context, input);
    }
    if (this.capabilityRegistry && toolName !== 'runtime_context') {
      return await this.capabilityRegistry.invoke({
        toolName,
        context,
        workerRole: 'parent',
        effectiveSkillIds: context.skillIds,
        value: input,
      });
    }
    if (toolName !== 'runtime_context') throw new Error('Product tool is unavailable');
    const skills = await this.listSkills(context.skillIds, context.skillIds);
    const details: RuntimeContextDetailsV1 = {
      schema: 'runtime-context.v1',
      skills,
      commands: buildProductCodingCommandCatalog(skills),
    };
    return {
      content: [{ type: 'text', text: JSON.stringify(details) }],
      details,
    };
  }

}