import type { OpenClawConfig, ProviderAuthResult } from "openclaw/plugin-sdk/provider-auth";
import { readClaudeCliCredentialsCached } from "openclaw/plugin-sdk/provider-auth";

const DEFAULT_CLAUDE_CLI_MODEL = "claude-cli/claude-sonnet-4-6";
type AgentDefaultsModel = NonNullable<NonNullable<OpenClawConfig["agents"]>["defaults"]>["model"];
type AgentDefaultsModels = NonNullable<NonNullable<OpenClawConfig["agents"]>["defaults"]>["models"];

function toClaudeCliModelRef(raw: string): string | null {
  const trimmed = raw.trim();
  if (!trimmed.toLowerCase().startsWith("anthropic/")) {
    return null;
  }
  const modelId = trimmed.slice("anthropic/".length).trim();
  if (!modelId.toLowerCase().startsWith("claude-")) {
    return null;
  }
  return `claude-cli/${modelId}`;
}

function rewriteModelSelection(model: AgentDefaultsModel): {
  value: AgentDefaultsModel;
  primary?: string;
  changed: boolean;
} {
  if (typeof model === "string") {
    const converted = toClaudeCliModelRef(model);
    return converted
      ? { value: converted, primary: converted, changed: true }
      : { value: model, changed: false };
  }
  if (!model || typeof model !== "object" || Array.isArray(model)) {
    return { value: model, changed: false };
  }

  const current = model as Record<string, unknown>;
  const next: Record<string, unknown> = { ...current };
  let changed = false;
  let primary: string | undefined;

  if (typeof current.primary === "string") {
    const converted = toClaudeCliModelRef(current.primary);
    if (converted) {
      next.primary = converted;
      primary = converted;
      changed = true;
    }
  }

  const currentFallbacks = current.fallbacks;
  if (Array.isArray(currentFallbacks)) {
    const nextFallbacks = currentFallbacks.map((entry) =>
      typeof entry === "string" ? (toClaudeCliModelRef(entry) ?? entry) : entry,
    );
    if (nextFallbacks.some((entry, index) => entry !== currentFallbacks[index])) {
      next.fallbacks = nextFallbacks;
      changed = true;
    }
  }

  return {
    value: changed ? next : model,
    ...(primary ? { primary } : {}),
    changed,
  };
}

function rewriteModelEntryMap(models: Record<string, unknown> | undefined): {
  value: Record<string, unknown> | undefined;
  migrated: string[];
} {
  if (!models) {
    return { value: models, migrated: [] };
  }

  const next = { ...models };
  const migrated: string[] = [];

  for (const [rawKey, value] of Object.entries(models)) {
    const converted = toClaudeCliModelRef(rawKey);
    if (!converted) {
      continue;
    }
    if (!(converted in next)) {
      next[converted] = value;
    }
    delete next[rawKey];
    migrated.push(converted);
  }

  return {
    value: migrated.length > 0 ? next : models,
    migrated,
  };
}

export function hasClaudeCliAuth(): boolean {
  return Boolean(readClaudeCliCredentialsCached());
}

export function buildAnthropicCliMigrationResult(config: OpenClawConfig): ProviderAuthResult {
  const defaults = config.agents?.defaults;
  const rewrittenModel = rewriteModelSelection(defaults?.model);
  const rewrittenModels = rewriteModelEntryMap(defaults?.models);
  const existingModels = (rewrittenModels.value ??
    defaults?.models ??
    {}) as NonNullable<AgentDefaultsModels>;
  const defaultModel = rewrittenModel.primary ?? DEFAULT_CLAUDE_CLI_MODEL;

  return {
    profiles: [],
    configPatch: {
      agents: {
        defaults: {
          ...(rewrittenModel.changed ? { model: rewrittenModel.value } : {}),
          models: {
            ...existingModels,
            [defaultModel]: existingModels[defaultModel] ?? {},
          } as NonNullable<AgentDefaultsModels>,
        },
      },
    },
    defaultModel,
    notes: [
      "Claude CLI auth detected; switched Anthropic model selection to the local Claude CLI backend.",
      "Existing Anthropic auth profiles are kept for rollback.",
      ...(rewrittenModels.migrated.length > 0
        ? [`Migrated allowlist entries: ${rewrittenModels.migrated.join(", ")}.`]
        : []),
    ],
  };
}