import {
  resolveAgentModelFallbackValues,
  resolveAgentModelPrimaryValue,
} from "../config/model-input.js";
import type { OpenClawConfig } from "../config/types.openclaw.js";
import { createSubsystemLogger } from "../logging/subsystem.js";
import {
  normalizeLowercaseStringOrEmpty,
  normalizeOptionalString,
} from "../shared/string-coerce.js";
import { sanitizeForLog, stripAnsi } from "../terminal/ansi.js";
import { resolveConfiguredProviderFallback } from "./configured-provider-fallback.js";
import { DEFAULT_PROVIDER } from "./defaults.js";
import type { ModelCatalogEntry } from "./model-catalog.types.js";
import { splitTrailingAuthProfile } from "./model-ref-profile.js";
import {
  type ModelRef,
  modelKey,
  normalizeProviderId,
  parseModelRef,
} from "./model-selection-normalize.js";

let log: ReturnType<typeof createSubsystemLogger> | null = null;

function getLog(): ReturnType<typeof createSubsystemLogger> {
  log ??= createSubsystemLogger("model-selection");
  return log;
}

export type ModelAliasIndex = {
  byAlias: Map<string, { alias: string; ref: ModelRef }>;
  byKey: Map<string, string[]>;
};

function sanitizeModelWarningValue(value: string): string {
  const stripped = value ? stripAnsi(value) : "";
  let controlBoundary = -1;
  for (let index = 0; index < stripped.length; index += 1) {
    const code = stripped.charCodeAt(index);
    if (code <= 0x1f || code === 0x7f) {
      controlBoundary = index;
      break;
    }
  }
  if (controlBoundary === -1) {
    return sanitizeForLog(stripped);
  }
  return sanitizeForLog(stripped.slice(0, controlBoundary));
}

export function inferUniqueProviderFromConfiguredModels(params: {
  cfg: OpenClawConfig;
  model: string;
}): string | undefined {
  const model = params.model.trim();
  if (!model) {
    return undefined;
  }
  const normalized = normalizeLowercaseStringOrEmpty(model);
  const providers = new Set<string>();
  const addProvider = (provider: string) => {
    const normalizedProvider = normalizeProviderId(provider);
    if (!normalizedProvider) {
      return;
    }
    providers.add(normalizedProvider);
  };
  const configuredModels = params.cfg.agents?.defaults?.models;
  if (configuredModels) {
    for (const key of Object.keys(configuredModels)) {
      const ref = key.trim();
      if (!ref || !ref.includes("/")) {
        continue;
      }
      const parsed = parseModelRef(ref, DEFAULT_PROVIDER, {
        allowPluginNormalization: false,
      });
      if (!parsed) {
        continue;
      }
      if (parsed.model === model || normalizeLowercaseStringOrEmpty(parsed.model) === normalized) {
        addProvider(parsed.provider);
        if (providers.size > 1) {
          return undefined;
        }
      }
    }
  }
  const configuredProviders = params.cfg.models?.providers;
  if (configuredProviders) {
    for (const [providerId, providerConfig] of Object.entries(configuredProviders)) {
      const models = providerConfig?.models;
      if (!Array.isArray(models)) {
        continue;
      }
      for (const entry of models) {
        const modelId = entry?.id?.trim();
        if (!modelId) {
          continue;
        }
        if (modelId === model || normalizeLowercaseStringOrEmpty(modelId) === normalized) {
          addProvider(providerId);
        }
      }
      if (providers.size > 1) {
        return undefined;
      }
    }
  }
  if (providers.size !== 1) {
    return undefined;
  }
  return providers.values().next().value;
}

function resolveAllowlistModelKey(raw: string, defaultProvider: string): string | null {
  const parsed = parseModelRef(raw, defaultProvider);
  if (!parsed) {
    return null;
  }
  return modelKey(parsed.provider, parsed.model);
}

export function buildConfiguredAllowlistKeys(params: {
  cfg: OpenClawConfig | undefined;
  defaultProvider: string;
}): Set<string> | null {
  const rawAllowlist = Object.keys(params.cfg?.agents?.defaults?.models ?? {});
  if (rawAllowlist.length === 0) {
    return null;
  }

  const keys = new Set<string>();
  for (const raw of rawAllowlist) {
    const key = resolveAllowlistModelKey(raw, params.defaultProvider);
    if (key) {
      keys.add(key);
    }
  }
  return keys.size > 0 ? keys : null;
}

export function buildModelAliasIndex(params: {
  cfg: OpenClawConfig;
  defaultProvider: string;
  allowPluginNormalization?: boolean;
}): ModelAliasIndex {
  const byAlias = new Map<string, { alias: string; ref: ModelRef }>();
  const byKey = new Map<string, string[]>();

  const rawModels = params.cfg.agents?.defaults?.models ?? {};
  for (const [keyRaw, entryRaw] of Object.entries(rawModels)) {
    const parsed = parseModelRef(keyRaw, params.defaultProvider, {
      allowPluginNormalization: params.allowPluginNormalization,
    });
    if (!parsed) {
      continue;
    }
    const alias =
      normalizeOptionalString((entryRaw as { alias?: string } | undefined)?.alias) ?? "";
    if (!alias) {
      continue;
    }
    const aliasKey = normalizeLowercaseStringOrEmpty(alias);
    byAlias.set(aliasKey, { alias, ref: parsed });
    const key = modelKey(parsed.provider, parsed.model);
    const existing = byKey.get(key) ?? [];
    existing.push(alias);
    byKey.set(key, existing);
  }

  return { byAlias, byKey };
}

type ModelCatalogMetadata = {
  configuredByKey: Map<string, ModelCatalogEntry>;
  aliasByKey: Map<string, string>;
};

function buildModelCatalogMetadata(params: {
  cfg: OpenClawConfig;
  defaultProvider: string;
}): ModelCatalogMetadata {
  const configuredByKey = new Map<string, ModelCatalogEntry>();
  for (const entry of buildConfiguredModelCatalog({ cfg: params.cfg })) {
    configuredByKey.set(modelKey(entry.provider, entry.id), entry);
  }

  const aliasByKey = new Map<string, string>();
  const configuredModels = params.cfg.agents?.defaults?.models ?? {};
  for (const [rawKey, entryRaw] of Object.entries(configuredModels)) {
    const key = resolveAllowlistModelKey(rawKey, params.defaultProvider);
    if (!key) {
      continue;
    }
    const alias = ((entryRaw as { alias?: string } | undefined)?.alias ?? "").trim();
    if (!alias) {
      continue;
    }
    aliasByKey.set(key, alias);
  }

  return { configuredByKey, aliasByKey };
}

function applyModelCatalogMetadata(params: {
  entry: ModelCatalogEntry;
  metadata: ModelCatalogMetadata;
}): ModelCatalogEntry {
  const key = modelKey(params.entry.provider, params.entry.id);
  const configuredEntry = params.metadata.configuredByKey.get(key);
  const alias = params.metadata.aliasByKey.get(key);
  if (!configuredEntry && !alias) {
    return params.entry;
  }
  const nextAlias = alias ?? params.entry.alias;
  const nextContextWindow = configuredEntry?.contextWindow ?? params.entry.contextWindow;
  const nextReasoning = configuredEntry?.reasoning ?? params.entry.reasoning;
  const nextInput = configuredEntry?.input ?? params.entry.input;

  return {
    ...params.entry,
    name: configuredEntry?.name ?? params.entry.name,
    ...(nextAlias ? { alias: nextAlias } : {}),
    ...(nextContextWindow !== undefined ? { contextWindow: nextContextWindow } : {}),
    ...(nextReasoning !== undefined ? { reasoning: nextReasoning } : {}),
    ...(nextInput ? { input: nextInput } : {}),
  };
}

function buildSyntheticAllowedCatalogEntry(params: {
  parsed: ModelRef;
  metadata: ModelCatalogMetadata;
}): ModelCatalogEntry {
  const key = modelKey(params.parsed.provider, params.parsed.model);
  const configuredEntry = params.metadata.configuredByKey.get(key);
  const alias = params.metadata.aliasByKey.get(key);
  const nextContextWindow = configuredEntry?.contextWindow;
  const nextReasoning = configuredEntry?.reasoning;
  const nextInput = configuredEntry?.input;

  return {
    id: params.parsed.model,
    name: configuredEntry?.name ?? params.parsed.model,
    provider: params.parsed.provider,
    ...(alias ? { alias } : {}),
    ...(nextContextWindow !== undefined ? { contextWindow: nextContextWindow } : {}),
    ...(nextReasoning !== undefined ? { reasoning: nextReasoning } : {}),
    ...(nextInput ? { input: nextInput } : {}),
  };
}

export function resolveModelRefFromString(params: {
  raw: string;
  defaultProvider: string;
  aliasIndex?: ModelAliasIndex;
  allowPluginNormalization?: boolean;
}): { ref: ModelRef; alias?: string } | null {
  const { model } = splitTrailingAuthProfile(params.raw);
  if (!model) {
    return null;
  }
  if (!model.includes("/")) {
    const aliasKey = normalizeLowercaseStringOrEmpty(model);
    const aliasMatch = params.aliasIndex?.byAlias.get(aliasKey);
    if (aliasMatch) {
      return { ref: aliasMatch.ref, alias: aliasMatch.alias };
    }
  }
  const parsed = parseModelRef(model, params.defaultProvider, {
    allowPluginNormalization: params.allowPluginNormalization,
  });
  if (!parsed) {
    return null;
  }
  return { ref: parsed };
}

export function resolveConfiguredModelRef(params: {
  cfg: OpenClawConfig;
  defaultProvider: string;
  defaultModel: string;
  allowPluginNormalization?: boolean;
}): ModelRef {
  const rawModel = resolveAgentModelPrimaryValue(params.cfg.agents?.defaults?.model) ?? "";
  if (rawModel) {
    const trimmed = rawModel.trim();
    const aliasIndex = buildModelAliasIndex({
      cfg: params.cfg,
      defaultProvider: params.defaultProvider,
      allowPluginNormalization: params.allowPluginNormalization,
    });
    if (!trimmed.includes("/")) {
      const aliasKey = normalizeLowercaseStringOrEmpty(trimmed);
      const aliasMatch = aliasIndex.byAlias.get(aliasKey);
      if (aliasMatch) {
        return aliasMatch.ref;
      }

      const inferredProvider = inferUniqueProviderFromConfiguredModels({
        cfg: params.cfg,
        model: trimmed,
      });
      if (inferredProvider) {
        return { provider: inferredProvider, model: trimmed };
      }

      const safeTrimmed = sanitizeModelWarningValue(trimmed);
      const safeResolved = sanitizeForLog(`${params.defaultProvider}/${safeTrimmed}`);
      getLog().warn(
        `Model "${safeTrimmed}" specified without provider. Falling back to "${safeResolved}". Please use "${safeResolved}" in your config.`,
      );
      return { provider: params.defaultProvider, model: trimmed };
    }

    const resolved = resolveModelRefFromString({
      raw: trimmed,
      defaultProvider: params.defaultProvider,
      aliasIndex,
      allowPluginNormalization: params.allowPluginNormalization,
    });
    if (resolved) {
      return resolved.ref;
    }

    const safe = sanitizeForLog(trimmed);
    const safeFallback = sanitizeForLog(`${params.defaultProvider}/${params.defaultModel}`);
    getLog().warn(
      `Model "${safe}" could not be resolved. Falling back to default "${safeFallback}".`,
    );
  }
  const fallbackProvider = resolveConfiguredProviderFallback({
    cfg: params.cfg,
    defaultProvider: params.defaultProvider,
  });
  if (fallbackProvider) {
    return fallbackProvider;
  }
  return { provider: params.defaultProvider, model: params.defaultModel };
}

export function buildAllowedModelSet(params: {
  cfg: OpenClawConfig;
  catalog: ModelCatalogEntry[];
  defaultProvider: string;
  defaultModel?: string;
}): {
  allowAny: boolean;
  allowedCatalog: ModelCatalogEntry[];
  allowedKeys: Set<string>;
} {
  const metadata = buildModelCatalogMetadata({
    cfg: params.cfg,
    defaultProvider: params.defaultProvider,
  });
  const catalog = params.catalog.map((entry) => applyModelCatalogMetadata({ entry, metadata }));
  const rawAllowlist = (() => {
    const modelMap = params.cfg.agents?.defaults?.models ?? {};
    return Object.keys(modelMap);
  })();
  const allowAny = rawAllowlist.length === 0;
  const defaultModel = params.defaultModel?.trim();
  const defaultRef =
    defaultModel && params.defaultProvider
      ? parseModelRef(defaultModel, params.defaultProvider)
      : null;
  const defaultKey = defaultRef ? modelKey(defaultRef.provider, defaultRef.model) : undefined;
  const catalogKeys = new Set(catalog.map((entry) => modelKey(entry.provider, entry.id)));

  if (allowAny) {
    if (defaultKey) {
      catalogKeys.add(defaultKey);
    }
    return {
      allowAny: true,
      allowedCatalog: catalog,
      allowedKeys: catalogKeys,
    };
  }

  const allowedKeys = new Set<string>();
  const syntheticCatalogEntries = new Map<string, ModelCatalogEntry>();
  for (const raw of rawAllowlist) {
    const parsed = parseModelRef(raw, params.defaultProvider);
    if (!parsed) {
      continue;
    }
    const key = modelKey(parsed.provider, parsed.model);
    allowedKeys.add(key);

    if (!catalogKeys.has(key) && !syntheticCatalogEntries.has(key)) {
      syntheticCatalogEntries.set(key, buildSyntheticAllowedCatalogEntry({ parsed, metadata }));
    }
  }

  for (const fallback of resolveAgentModelFallbackValues(params.cfg.agents?.defaults?.model)) {
    const parsed = parseModelRef(fallback, params.defaultProvider);
    if (!parsed) {
      continue;
    }
    const key = modelKey(parsed.provider, parsed.model);
    allowedKeys.add(key);

    if (!catalogKeys.has(key) && !syntheticCatalogEntries.has(key)) {
      syntheticCatalogEntries.set(key, buildSyntheticAllowedCatalogEntry({ parsed, metadata }));
    }
  }

  if (defaultKey) {
    allowedKeys.add(defaultKey);
  }

  const allowedCatalog = [
    ...catalog.filter((entry) => allowedKeys.has(modelKey(entry.provider, entry.id))),
    ...syntheticCatalogEntries.values(),
  ];

  if (allowedCatalog.length === 0 && allowedKeys.size === 0) {
    if (defaultKey) {
      catalogKeys.add(defaultKey);
    }
    return {
      allowAny: true,
      allowedCatalog: catalog,
      allowedKeys: catalogKeys,
    };
  }

  return { allowAny: false, allowedCatalog, allowedKeys };
}

export function buildConfiguredModelCatalog(params: { cfg: OpenClawConfig }): ModelCatalogEntry[] {
  const providers = params.cfg.models?.providers;
  if (!providers || typeof providers !== "object") {
    return [];
  }

  const catalog: ModelCatalogEntry[] = [];
  for (const [providerRaw, provider] of Object.entries(providers)) {
    const providerId = normalizeProviderId(providerRaw);
    if (!providerId || !Array.isArray(provider?.models)) {
      continue;
    }
    for (const model of provider.models) {
      const id = normalizeOptionalString(model?.id) ?? "";
      if (!id) {
        continue;
      }
      const name = normalizeOptionalString(model?.name) || id;
      const contextWindow =
        typeof model?.contextWindow === "number" && model.contextWindow > 0
          ? model.contextWindow
          : undefined;
      const reasoning = typeof model?.reasoning === "boolean" ? model.reasoning : undefined;
      const input = Array.isArray(model?.input) ? model.input : undefined;
      catalog.push({
        provider: providerId,
        id,
        name,
        contextWindow,
        reasoning,
        input,
      });
    }
  }

  return catalog;
}

export type ModelRefStatus = {
  key: string;
  inCatalog: boolean;
  allowAny: boolean;
  allowed: boolean;
};

export function getModelRefStatus(params: {
  cfg: OpenClawConfig;
  catalog: ModelCatalogEntry[];
  ref: ModelRef;
  defaultProvider: string;
  defaultModel?: string;
}): ModelRefStatus {
  const allowed = buildAllowedModelSet({
    cfg: params.cfg,
    catalog: params.catalog,
    defaultProvider: params.defaultProvider,
    defaultModel: params.defaultModel,
  });
  const key = modelKey(params.ref.provider, params.ref.model);
  return {
    key,
    inCatalog: params.catalog.some((entry) => modelKey(entry.provider, entry.id) === key),
    allowAny: allowed.allowAny,
    allowed: allowed.allowAny || allowed.allowedKeys.has(key),
  };
}

export function resolveAllowedModelRef(params: {
  cfg: OpenClawConfig;
  catalog: ModelCatalogEntry[];
  raw: string;
  defaultProvider: string;
  defaultModel?: string;
}):
  | { ref: ModelRef; key: string }
  | {
      error: string;
    } {
  const trimmed = params.raw.trim();
  if (!trimmed) {
    return { error: "invalid model: empty" };
  }

  const aliasIndex = buildModelAliasIndex({
    cfg: params.cfg,
    defaultProvider: params.defaultProvider,
  });

  const effectiveDefaultProvider = !trimmed.includes("/")
    ? (inferUniqueProviderFromConfiguredModels({ cfg: params.cfg, model: trimmed }) ??
      params.defaultProvider)
    : params.defaultProvider;

  const resolved = resolveModelRefFromString({
    raw: trimmed,
    defaultProvider: effectiveDefaultProvider,
    aliasIndex,
  });
  if (!resolved) {
    return { error: `invalid model: ${trimmed}` };
  }

  const status = getModelRefStatus({
    cfg: params.cfg,
    catalog: params.catalog,
    ref: resolved.ref,
    defaultProvider: params.defaultProvider,
    defaultModel: params.defaultModel,
  });
  if (!status.allowed) {
    return { error: `model not allowed: ${status.key}` };
  }

  return { ref: resolved.ref, key: status.key };
}

export function resolveHooksGmailModel(params: {
  cfg: OpenClawConfig;
  defaultProvider: string;
}): ModelRef | null {
  const hooksModel = params.cfg.hooks?.gmail?.model;
  if (!hooksModel?.trim()) {
    return null;
  }

  const aliasIndex = buildModelAliasIndex({
    cfg: params.cfg,
    defaultProvider: params.defaultProvider,
  });

  const resolved = resolveModelRefFromString({
    raw: hooksModel,
    defaultProvider: params.defaultProvider,
    aliasIndex,
  });

  return resolved?.ref ?? null;
}

export function normalizeModelSelection(value: unknown): string | undefined {
  if (typeof value === "string") {
    const trimmed = value.trim();
    return trimmed || undefined;
  }
  if (!value || typeof value !== "object") {
    return undefined;
  }
  const primary = (value as { primary?: unknown }).primary;
  if (typeof primary === "string" && primary.trim()) {
    return primary.trim();
  }
  return undefined;
}