import type { WizardPrompter } from './prompter/interface.js';
import type { ConfigService } from './config/config-service.js';
import type { WizardState } from './types.js';
import { welcomeStage } from './stages/welcome.js';
import { detectInstallStage } from './stages/detect-install.js';
import { modeSelectStage } from './stages/mode-select.js';
import { soulSetupStage } from './stages/soul-setup.js';
import { userSetupStage } from './stages/user-setup.js';
import { toolsSetupStage } from './stages/tools-setup.js';
import { runtimeSetupStage } from './stages/runtime-setup.js';
import { hooksPreviewStage } from './stages/hooks-preview.js';
import { skillsSelectStage } from './stages/skills-select.js';
import { finalizeStage } from './stages/finalize.js';
import { gatewayConfigStage } from './stages/gateway-config.js';
import { gatewayBootstrapStage } from './stages/gateway-bootstrap.js';

export interface WizardOptions {
  mosaicHome: string;
  sourceDir: string;
  prompter: WizardPrompter;
  configService: ConfigService;
  cliOverrides?: Partial<WizardState>;
  /**
   * Skip the terminal gateway stages. Used by callers that only want to
   * configure the framework (SOUL.md/USER.md/skills/hooks) without touching
   * the gateway daemon. Defaults to `false` — the unified first-run flow
   * runs everything end-to-end.
   */
  skipGateway?: boolean;
  /** Host passed through to the gateway config stage. Defaults to localhost. */
  gatewayHost?: string;
  /** Default gateway port (14242) — overridable by CLI flag. */
  gatewayPort?: number;
  /**
   * Explicit port override from the caller. Honored even when resuming
   * from an existing `.env` (useful when the saved port conflicts with
   * another service).
   */
  gatewayPortOverride?: number;
  /** Skip `npm install -g @mosaicstack/gateway` during the config stage. */
  skipGatewayNpmInstall?: boolean;
}

export async function runWizard(options: WizardOptions): Promise<void> {
  const { prompter, configService, mosaicHome, sourceDir } = options;

  const state: WizardState = {
    mosaicHome,
    sourceDir,
    mode: 'quick',
    installAction: 'fresh',
    soul: {},
    user: {},
    tools: {},
    runtimes: { detected: [], mcpConfigured: false },
    selectedSkills: [],
  };

  // Apply CLI overrides (strip undefined values)
  if (options.cliOverrides) {
    if (options.cliOverrides.soul) {
      for (const [k, v] of Object.entries(options.cliOverrides.soul)) {
        if (v !== undefined) {
          (state.soul as Record<string, unknown>)[k] = v;
        }
      }
    }
    if (options.cliOverrides.user) {
      for (const [k, v] of Object.entries(options.cliOverrides.user)) {
        if (v !== undefined) {
          (state.user as Record<string, unknown>)[k] = v;
        }
      }
    }
    if (options.cliOverrides.tools) {
      for (const [k, v] of Object.entries(options.cliOverrides.tools)) {
        if (v !== undefined) {
          (state.tools as Record<string, unknown>)[k] = v;
        }
      }
    }
    if (options.cliOverrides.mode) {
      state.mode = options.cliOverrides.mode;
    }
  }

  // Stage 1: Welcome
  await welcomeStage(prompter, state);

  // Stage 2: Existing Install Detection
  await detectInstallStage(prompter, state, configService);

  // Stage 3: Quick Start vs Advanced (skip if keeping existing)
  if (state.installAction === 'fresh' || state.installAction === 'reset') {
    await modeSelectStage(prompter, state);
  } else if (state.installAction === 'reconfigure') {
    state.mode = 'advanced';
  }

  // Stage 4: SOUL.md
  await soulSetupStage(prompter, state);

  // Stage 5: USER.md
  await userSetupStage(prompter, state);

  // Stage 6: TOOLS.md
  await toolsSetupStage(prompter, state);

  // Stage 7: Runtime Detection & Installation
  await runtimeSetupStage(prompter, state);

  // Stage 8: Hooks preview (Claude only — skipped if Claude not detected)
  await hooksPreviewStage(prompter, state);

  // Stage 9: Skills Selection
  await skillsSelectStage(prompter, state);

  // Stage 10: Finalize (writes configs, links runtime assets, runs doctor)
  await finalizeStage(prompter, state, configService);

  // Stages 11 & 12: Gateway config + admin bootstrap.
  // The unified first-run flow runs these as terminal stages so the user
  // goes from "welcome" through "admin user created" in a single cohesive
  // experience. Callers that only want the framework portion pass
  // `skipGateway: true`.
  if (!options.skipGateway) {
    const headlessRun = process.env['MOSAIC_ASSUME_YES'] === '1' || !process.stdin.isTTY;

    try {
      const configResult = await gatewayConfigStage(prompter, state, {
        host: options.gatewayHost ?? 'localhost',
        defaultPort: options.gatewayPort ?? 14242,
        portOverride: options.gatewayPortOverride,
        skipInstall: options.skipGatewayNpmInstall,
      });

      if (!configResult.ready || !configResult.host || !configResult.port) {
        if (headlessRun) {
          prompter.warn('Gateway configuration failed in headless mode — aborting wizard.');
          process.exit(1);
        }
      } else {
        const bootstrapResult = await gatewayBootstrapStage(prompter, state, {
          host: configResult.host,
          port: configResult.port,
        });
        if (!bootstrapResult.completed && headlessRun) {
          prompter.warn('Admin bootstrap failed in headless mode — aborting wizard.');
          process.exit(1);
        }
      }
    } catch (err) {
      // Stages normally return structured `ready: false` results for
      // expected failures. Anything that reaches here is an unexpected
      // runtime error — render a concise warning for UX AND re-throw so
      // the CLI (and `tools/install.sh` auto-launch) sees a non-zero exit.
      // Swallowing here would let headless installs report success even
      // when the gateway stage crashed.
      prompter.warn(`Gateway setup failed: ${err instanceof Error ? err.message : String(err)}`);
      throw err;
    }
  }
}