import type { OpenClawConfig } from "openclaw/plugin-sdk/provider-auth";
import { upsertAuthProfileWithLock } from "openclaw/plugin-sdk/provider-auth";
import { applyAgentDefaultModelPrimary } from "openclaw/plugin-sdk/provider-onboard";
import type { RuntimeEnv } from "openclaw/plugin-sdk/runtime";
import { WizardCancelledError, type WizardPrompter } from "openclaw/plugin-sdk/setup";
import { OLLAMA_DEFAULT_BASE_URL, OLLAMA_DEFAULT_MODEL } from "./defaults.js";
import {
  buildOllamaModelDefinition,
  enrichOllamaModelsWithContext,
  fetchOllamaModels,
  resolveOllamaApiBase,
  type OllamaModelWithContext,
} from "./provider-models.js";

const OLLAMA_SUGGESTED_MODELS_LOCAL = [OLLAMA_DEFAULT_MODEL];
const OLLAMA_SUGGESTED_MODELS_CLOUD = ["kimi-k2.5:cloud", "minimax-m2.5:cloud", "glm-5:cloud"];
const OLLAMA_CONTEXT_ENRICH_LIMIT = 200;

type OllamaMode = "remote" | "local";
type OllamaSetupOptions = {
  customBaseUrl?: string;
  customModelId?: string;
};

type OllamaCloudAuthResult = {
  signedIn: boolean;
  signinUrl?: string;
};

type ProviderConfig = {
  baseUrl: string;
  api: "ollama";
  models: ReturnType<typeof buildOllamaModelDefinition>[];
};

function normalizeOllamaModelName(value: string | undefined): string | undefined {
  const trimmed = value?.trim();
  if (!trimmed) {
    return undefined;
  }
  if (trimmed.toLowerCase().startsWith("ollama/")) {
    const normalized = trimmed.slice("ollama/".length).trim();
    return normalized || undefined;
  }
  return trimmed;
}

function isOllamaCloudModel(modelName: string | undefined): boolean {
  return Boolean(modelName?.trim().toLowerCase().endsWith(":cloud"));
}

function formatOllamaPullStatus(status: string): { text: string; hidePercent: boolean } {
  const trimmed = status.trim();
  const partStatusMatch = trimmed.match(/^([a-z-]+)\s+(?:sha256:)?[a-f0-9]{8,}$/i);
  if (partStatusMatch) {
    return { text: `${partStatusMatch[1]} part`, hidePercent: false };
  }
  if (/^verifying\b.*\bdigest\b/i.test(trimmed)) {
    return { text: "verifying digest", hidePercent: true };
  }
  return { text: trimmed, hidePercent: false };
}

async function checkOllamaCloudAuth(baseUrl: string): Promise<OllamaCloudAuthResult> {
  try {
    const apiBase = resolveOllamaApiBase(baseUrl);
    const response = await fetch(`${apiBase}/api/me`, {
      method: "POST",
      signal: AbortSignal.timeout(5000),
    });
    if (response.status === 401) {
      const data = (await response.json()) as { signin_url?: string };
      return { signedIn: false, signinUrl: data.signin_url };
    }
    if (!response.ok) {
      return { signedIn: false };
    }
    return { signedIn: true };
  } catch {
    return { signedIn: false };
  }
}

type OllamaPullChunk = {
  status?: string;
  total?: number;
  completed?: number;
  error?: string;
};

type OllamaPullResult = { ok: true } | { ok: false; message: string };

async function pullOllamaModelCore(params: {
  baseUrl: string;
  modelName: string;
  onStatus?: (status: string, percent: number | null) => void;
}): Promise<OllamaPullResult> {
  const baseUrl = resolveOllamaApiBase(params.baseUrl);
  const modelName = normalizeOllamaModelName(params.modelName) ?? params.modelName.trim();
  try {
    const response = await fetch(`${baseUrl}/api/pull`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ name: modelName }),
    });
    if (!response.ok) {
      return { ok: false, message: `Failed to download ${modelName} (HTTP ${response.status})` };
    }
    if (!response.body) {
      return { ok: false, message: `Failed to download ${modelName} (no response body)` };
    }

    const reader = response.body.getReader();
    const decoder = new TextDecoder();
    let buffer = "";
    const layers = new Map<string, { total: number; completed: number }>();

    const parseLine = (line: string): OllamaPullResult => {
      const trimmed = line.trim();
      if (!trimmed) {
        return { ok: true };
      }
      try {
        const chunk = JSON.parse(trimmed) as OllamaPullChunk;
        if (chunk.error) {
          return { ok: false, message: `Download failed: ${chunk.error}` };
        }
        if (!chunk.status) {
          return { ok: true };
        }
        if (chunk.total && chunk.completed !== undefined) {
          layers.set(chunk.status, { total: chunk.total, completed: chunk.completed });
          let totalSum = 0;
          let completedSum = 0;
          for (const layer of layers.values()) {
            totalSum += layer.total;
            completedSum += layer.completed;
          }
          params.onStatus?.(
            chunk.status,
            totalSum > 0 ? Math.round((completedSum / totalSum) * 100) : null,
          );
        } else {
          params.onStatus?.(chunk.status, null);
        }
      } catch {
        // Ignore malformed streaming lines from Ollama.
      }
      return { ok: true };
    };

    for (;;) {
      const { done, value } = await reader.read();
      if (done) {
        break;
      }
      buffer += decoder.decode(value, { stream: true });
      const lines = buffer.split("\n");
      buffer = lines.pop() ?? "";
      for (const line of lines) {
        const parsed = parseLine(line);
        if (!parsed.ok) {
          return parsed;
        }
      }
    }

    const trailing = buffer.trim();
    if (trailing) {
      const parsed = parseLine(trailing);
      if (!parsed.ok) {
        return parsed;
      }
    }

    return { ok: true };
  } catch (err) {
    const reason = err instanceof Error ? err.message : String(err);
    return { ok: false, message: `Failed to download ${modelName}: ${reason}` };
  }
}

async function pullOllamaModel(
  baseUrl: string,
  modelName: string,
  prompter: WizardPrompter,
): Promise<boolean> {
  const spinner = prompter.progress(`Downloading ${modelName}...`);
  const result = await pullOllamaModelCore({
    baseUrl,
    modelName,
    onStatus: (status, percent) => {
      const displayStatus = formatOllamaPullStatus(status);
      if (displayStatus.hidePercent) {
        spinner.update(`Downloading ${modelName} - ${displayStatus.text}`);
      } else {
        spinner.update(`Downloading ${modelName} - ${displayStatus.text} - ${percent ?? 0}%`);
      }
    },
  });
  if (!result.ok) {
    spinner.stop(result.message);
    return false;
  }
  spinner.stop(`Downloaded ${modelName}`);
  return true;
}

async function pullOllamaModelNonInteractive(
  baseUrl: string,
  modelName: string,
  runtime: RuntimeEnv,
): Promise<boolean> {
  runtime.log(`Downloading ${modelName}...`);
  const result = await pullOllamaModelCore({ baseUrl, modelName });
  if (!result.ok) {
    runtime.error(result.message);
    return false;
  }
  runtime.log(`Downloaded ${modelName}`);
  return true;
}

function buildOllamaModelsConfig(
  modelNames: string[],
  discoveredModelsByName?: Map<string, OllamaModelWithContext>,
) {
  return modelNames.map((name) =>
    buildOllamaModelDefinition(name, discoveredModelsByName?.get(name)?.contextWindow),
  );
}

function applyOllamaProviderConfig(
  cfg: OpenClawConfig,
  baseUrl: string,
  modelNames: string[],
  discoveredModelsByName?: Map<string, OllamaModelWithContext>,
): OpenClawConfig {
  return {
    ...cfg,
    models: {
      ...cfg.models,
      mode: cfg.models?.mode ?? "merge",
      providers: {
        ...cfg.models?.providers,
        ollama: {
          baseUrl,
          api: "ollama",
          // pragma: allowlist secret
          apiKey: "OLLAMA_API_KEY",
          models: buildOllamaModelsConfig(modelNames, discoveredModelsByName),
        },
      },
    },
  };
}

async function storeOllamaCredential(agentDir?: string): Promise<void> {
  await upsertAuthProfileWithLock({
    profileId: "ollama:default",
    credential: { type: "api_key", provider: "ollama", key: "ollama-local" },
    agentDir,
  });
}

export async function buildOllamaProvider(
  configuredBaseUrl?: string,
  opts?: { quiet?: boolean },
): Promise<ProviderConfig> {
  const apiBase = resolveOllamaApiBase(configuredBaseUrl);
  const { reachable, models } = await fetchOllamaModels(apiBase);
  if (!reachable && !opts?.quiet) {
    console.warn(`Ollama could not be reached at ${apiBase}.`);
  }
  const discovered = await enrichOllamaModelsWithContext(
    apiBase,
    models.slice(0, OLLAMA_CONTEXT_ENRICH_LIMIT),
  );
  return {
    baseUrl: apiBase,
    api: "ollama",
    models: discovered.map((model) => buildOllamaModelDefinition(model.name, model.contextWindow)),
  };
}

export async function promptAndConfigureOllama(params: {
  cfg: OpenClawConfig;
  prompter: WizardPrompter;
  isRemote: boolean;
  openUrl: (url: string) => Promise<void>;
}): Promise<{ config: OpenClawConfig }> {
  const baseUrlRaw = await params.prompter.text({
    message: "Ollama base URL",
    initialValue: OLLAMA_DEFAULT_BASE_URL,
    placeholder: OLLAMA_DEFAULT_BASE_URL,
    validate: (value) => (value?.trim() ? undefined : "Required"),
  });
  const baseUrl = resolveOllamaApiBase(
    String(baseUrlRaw ?? "")
      .trim()
      .replace(/\/+$/, ""),
  );
  const { reachable, models } = await fetchOllamaModels(baseUrl);

  if (!reachable) {
    await params.prompter.note(
      [
        `Ollama could not be reached at ${baseUrl}.`,
        "Download it at https://ollama.com/download",
        "",
        "Start Ollama and re-run setup.",
      ].join("\n"),
      "Ollama",
    );
    throw new WizardCancelledError("Ollama not reachable");
  }

  const enrichedModels = await enrichOllamaModelsWithContext(
    baseUrl,
    models.slice(0, OLLAMA_CONTEXT_ENRICH_LIMIT),
  );
  const discoveredModelsByName = new Map(enrichedModels.map((model) => [model.name, model]));
  const modelNames = models.map((model) => model.name);
  const mode = (await params.prompter.select({
    message: "Ollama mode",
    options: [
      { value: "remote", label: "Cloud + Local", hint: "Ollama cloud models + local models" },
      { value: "local", label: "Local", hint: "Local models only" },
    ],
  })) as OllamaMode;

  let cloudAuthVerified = false;
  if (mode === "remote") {
    const authResult = await checkOllamaCloudAuth(baseUrl);
    if (!authResult.signedIn) {
      if (authResult.signinUrl) {
        if (!params.isRemote) {
          await params.openUrl(authResult.signinUrl);
        }
        await params.prompter.note(
          ["Sign in to Ollama Cloud:", authResult.signinUrl].join("\n"),
          "Ollama Cloud",
        );
        const confirmed = await params.prompter.confirm({ message: "Have you signed in?" });
        if (!confirmed) {
          throw new WizardCancelledError("Ollama cloud sign-in cancelled");
        }
        if (!(await checkOllamaCloudAuth(baseUrl)).signedIn) {
          throw new WizardCancelledError("Ollama cloud sign-in required");
        }
        cloudAuthVerified = true;
      } else {
        await params.prompter.note(
          [
            "Could not verify Ollama Cloud authentication.",
            "Cloud models may not work until you sign in at https://ollama.com.",
          ].join("\n"),
          "Ollama Cloud",
        );
        if (!(await params.prompter.confirm({ message: "Continue without cloud auth?" }))) {
          throw new WizardCancelledError("Ollama cloud auth could not be verified");
        }
      }
    } else {
      cloudAuthVerified = true;
    }
  }

  const suggestedModels =
    mode === "local" || !cloudAuthVerified
      ? OLLAMA_SUGGESTED_MODELS_LOCAL
      : OLLAMA_SUGGESTED_MODELS_CLOUD;
  const orderedModelNames = [
    ...suggestedModels,
    ...modelNames.filter((name) => !suggestedModels.includes(name)),
  ];

  return {
    config: applyOllamaProviderConfig(
      params.cfg,
      baseUrl,
      orderedModelNames,
      discoveredModelsByName,
    ),
  };
}

export async function configureOllamaNonInteractive(params: {
  nextConfig: OpenClawConfig;
  opts: OllamaSetupOptions;
  runtime: RuntimeEnv;
  agentDir?: string;
}): Promise<OpenClawConfig> {
  const baseUrl = resolveOllamaApiBase(
    (params.opts.customBaseUrl?.trim() || OLLAMA_DEFAULT_BASE_URL).replace(/\/+$/, ""),
  );
  const { reachable, models } = await fetchOllamaModels(baseUrl);
  const explicitModel = normalizeOllamaModelName(params.opts.customModelId);

  if (!reachable) {
    params.runtime.error(
      [
        `Ollama could not be reached at ${baseUrl}.`,
        "Download it at https://ollama.com/download",
      ].join("\n"),
    );
    params.runtime.exit(1);
    return params.nextConfig;
  }

  await storeOllamaCredential(params.agentDir);

  const enrichedModels = await enrichOllamaModelsWithContext(
    baseUrl,
    models.slice(0, OLLAMA_CONTEXT_ENRICH_LIMIT),
  );
  const discoveredModelsByName = new Map(enrichedModels.map((model) => [model.name, model]));
  const modelNames = models.map((model) => model.name);
  const orderedModelNames = [
    ...OLLAMA_SUGGESTED_MODELS_LOCAL,
    ...modelNames.filter((name) => !OLLAMA_SUGGESTED_MODELS_LOCAL.includes(name)),
  ];

  const requestedDefaultModelId = explicitModel ?? OLLAMA_SUGGESTED_MODELS_LOCAL[0];
  const availableModelNames = new Set(modelNames);
  const requestedCloudModel = isOllamaCloudModel(requestedDefaultModelId);
  let pulledRequestedModel = false;

  if (requestedCloudModel) {
    availableModelNames.add(requestedDefaultModelId);
  } else if (!modelNames.includes(requestedDefaultModelId)) {
    pulledRequestedModel = await pullOllamaModelNonInteractive(
      baseUrl,
      requestedDefaultModelId,
      params.runtime,
    );
    if (pulledRequestedModel) {
      availableModelNames.add(requestedDefaultModelId);
    }
  }

  let allModelNames = orderedModelNames;
  let defaultModelId = requestedDefaultModelId;
  if (
    (pulledRequestedModel || requestedCloudModel) &&
    !allModelNames.includes(requestedDefaultModelId)
  ) {
    allModelNames = [...allModelNames, requestedDefaultModelId];
  }

  if (!availableModelNames.has(requestedDefaultModelId)) {
    if (availableModelNames.size === 0) {
      params.runtime.error(
        [
          `No Ollama models are available at ${baseUrl}.`,
          "Pull a model first, then re-run setup.",
        ].join("\n"),
      );
      params.runtime.exit(1);
      return params.nextConfig;
    }

    defaultModelId =
      allModelNames.find((name) => availableModelNames.has(name)) ??
      Array.from(availableModelNames)[0]!;
    params.runtime.log(
      `Ollama model ${requestedDefaultModelId} was not available; using ${defaultModelId} instead.`,
    );
  }

  const config = applyOllamaProviderConfig(
    params.nextConfig,
    baseUrl,
    allModelNames,
    discoveredModelsByName,
  );
  params.runtime.log(`Default Ollama model: ${defaultModelId}`);
  return applyAgentDefaultModelPrimary(config, `ollama/${defaultModelId}`);
}

export async function ensureOllamaModelPulled(params: {
  config: OpenClawConfig;
  model: string;
  prompter: WizardPrompter;
}): Promise<void> {
  if (!params.model.startsWith("ollama/")) {
    return;
  }
  const baseUrl = params.config.models?.providers?.ollama?.baseUrl ?? OLLAMA_DEFAULT_BASE_URL;
  const modelName = params.model.slice("ollama/".length);
  if (isOllamaCloudModel(modelName)) {
    return;
  }
  const { models } = await fetchOllamaModels(baseUrl);
  if (models.some((model) => model.name === modelName)) {
    return;
  }
  if (!(await pullOllamaModel(baseUrl, modelName, params.prompter))) {
    throw new WizardCancelledError("Failed to download selected Ollama model");
  }
}