/**
 * Command Code provider for pi.
 *
 * Connects pi to Command Code's API (https://api.commandcode.ai/alpha/generate).
 *
 * Authentication (pick one):
 *   1. Run `/login`, then select Command Code — opens browser to commandcode.ai, auto-stores API key
 *   2. Set COMMANDCODE_API_KEY environment variable
 *   3. Place API key in `~/.commandcode/auth.json` or `~/.pi/agent/auth.json`
 *      as {"apiKey": "user_..."} or {"commandcode": "user_..."}
 *
 * Models are fetched from Command Code's Provider API at startup.
 */

import { AssistantMessageEventStream } from "@earendil-works/pi-ai"
import {
  getAgentDir,
  type ExtensionAPI,
  type ExtensionCommandContext,
  type ProviderConfig,
} from "@earendil-works/pi-coding-agent"
import { join } from "node:path"

import { getApiKey as getStoredApiKey } from "./src/converters.ts"
import { COMMAND_CODE_CLI_VERSION, createStreamCommandCode, DEFAULT_API_BASE } from "./src/core.ts"
import { calculateCommandCodeCost } from "./src/cost.ts"
import {
  DEFAULT_MODELS_URL,
  getModelsTimeoutMs,
  loadCommandCodeModels,
  thinkingMetadataForModel,
  type CommandCodeModel,
} from "./src/models.ts"
import { getApiKey as getOAuthApiKey, login, refreshToken } from "./src/oauth.ts"
import { MODEL_COSTS, ZERO_MODEL_COST } from "./src/pricing.ts"
import { createCommandCodeRuntime } from "./src/runtime.ts"

function createProviderConfig(
  models: readonly CommandCodeModel[],
  apiBase: string,
  streamCommandCode: ProviderConfig["streamSimple"],
): ProviderConfig {
  return {
    name: "Command Code",
    baseUrl: apiBase,
    apiKey: "$COMMANDCODE_API_KEY",
    authHeader: true,
    api: "commandcode-custom",
    streamSimple: streamCommandCode,
    headers: {
      "x-commandcode-version": COMMAND_CODE_CLI_VERSION,
    },
    oauth: {
      name: "Command Code",
      login,
      refreshToken,
      getApiKey: getOAuthApiKey,
    },
    models: models.map((model) => ({
      id: model.id,
      name: model.name,
      reasoning: model.reasoning,
      ...(thinkingMetadataForModel(model.id) ?? {}),
      input: ["text"] as const,
      cost: MODEL_COSTS[model.id] ?? ZERO_MODEL_COST,
      contextWindow: model.contextWindow,
      maxTokens: model.maxTokens,
    })),
  }
}

export default async function (pi: ExtensionAPI) {
  const apiBase = process.env.COMMANDCODE_API_BASE ?? DEFAULT_API_BASE
  const modelsUrl = process.env.COMMANDCODE_MODELS_URL ?? DEFAULT_MODELS_URL
  const modelsTimeoutMs = getModelsTimeoutMs()
  const modelsCachePath =
    process.env.COMMANDCODE_MODELS_CACHE ?? join(getAgentDir(), "commandcode-models.json")
  const streamCommandCode = createStreamCommandCode({
    createStream: () => new AssistantMessageEventStream(),
    calculateCost: calculateCommandCodeCost,
    apiBase,
  })

  const runtime = createCommandCodeRuntime<ProviderConfig, ExtensionCommandContext>(pi, {
    endpoint: modelsUrl,
    cachePath: modelsCachePath,
    loadModels: () =>
      loadCommandCodeModels({
        url: modelsUrl,
        cachePath: modelsCachePath,
        timeoutMs: modelsTimeoutMs,
      }),
    createProviderConfig: (models) => createProviderConfig(models, apiBase, streamCommandCode),
  })

  await runtime.initialize()
}