import { describe, it, expect, vi } from "vitest";
import type { OpenClawConfig } from "../config/config.js";
import { resetLogger, setLoggerOverride } from "../logging/logger.js";
import {
  buildAllowedModelSet,
  inferUniqueProviderFromConfiguredModels,
  parseModelRef,
  buildModelAliasIndex,
  normalizeModelSelection,
  normalizeProviderId,
  normalizeProviderIdForAuth,
  modelKey,
  resolveAllowedModelRef,
  resolveConfiguredModelRef,
  resolveThinkingDefault,
  resolveModelRefFromString,
} from "./model-selection.js";

const EXPLICIT_ALLOWLIST_CONFIG = {
  agents: {
    defaults: {
      model: { primary: "openai/gpt-5.2" },
      models: {
        "anthropic/claude-sonnet-4-6": { alias: "sonnet" },
      },
    },
  },
} as OpenClawConfig;

const BUNDLED_ALLOWLIST_CATALOG = [
  { provider: "anthropic", id: "claude-sonnet-4-5", name: "Claude Sonnet 4.5" },
  { provider: "openai", id: "gpt-5.2", name: "gpt-5.2" },
];

const ANTHROPIC_OPUS_CATALOG = [
  {
    provider: "anthropic",
    id: "claude-opus-4-6",
    name: "Claude Opus 4.6",
    reasoning: true,
  },
];

function resolveAnthropicOpusThinking(cfg: OpenClawConfig) {
  return resolveThinkingDefault({
    cfg,
    provider: "anthropic",
    model: "claude-opus-4-6",
    catalog: ANTHROPIC_OPUS_CATALOG,
  });
}

describe("model-selection", () => {
  describe("normalizeProviderId", () => {
    it("should normalize provider names", () => {
      expect(normalizeProviderId("Anthropic")).toBe("anthropic");
      expect(normalizeProviderId("Z.ai")).toBe("zai");
      expect(normalizeProviderId("z-ai")).toBe("zai");
      expect(normalizeProviderId("OpenCode-Zen")).toBe("opencode");
      expect(normalizeProviderId("qwen")).toBe("qwen-portal");
      expect(normalizeProviderId("kimi-code")).toBe("kimi-coding");
      expect(normalizeProviderId("bedrock")).toBe("amazon-bedrock");
      expect(normalizeProviderId("aws-bedrock")).toBe("amazon-bedrock");
      expect(normalizeProviderId("amazon-bedrock")).toBe("amazon-bedrock");
    });
  });

  describe("normalizeProviderIdForAuth", () => {
    it("maps coding-plan variants to base provider for auth lookup", () => {
      expect(normalizeProviderIdForAuth("volcengine-plan")).toBe("volcengine");
      expect(normalizeProviderIdForAuth("byteplus-plan")).toBe("byteplus");
      expect(normalizeProviderIdForAuth("openai")).toBe("openai");
    });
  });

  describe("parseModelRef", () => {
    it("should parse full model refs", () => {
      expect(parseModelRef("anthropic/claude-3-5-sonnet", "openai")).toEqual({
        provider: "anthropic",
        model: "claude-3-5-sonnet",
      });
    });

    it("preserves nested model ids after provider prefix", () => {
      expect(parseModelRef("nvidia/moonshotai/kimi-k2.5", "anthropic")).toEqual({
        provider: "nvidia",
        model: "moonshotai/kimi-k2.5",
      });
    });

    it("normalizes anthropic alias refs to canonical model ids", () => {
      expect(parseModelRef("anthropic/opus-4.6", "openai")).toEqual({
        provider: "anthropic",
        model: "claude-opus-4-6",
      });
      expect(parseModelRef("opus-4.6", "anthropic")).toEqual({
        provider: "anthropic",
        model: "claude-opus-4-6",
      });
      expect(parseModelRef("anthropic/sonnet-4.6", "openai")).toEqual({
        provider: "anthropic",
        model: "claude-sonnet-4-6",
      });
      expect(parseModelRef("sonnet-4.6", "anthropic")).toEqual({
        provider: "anthropic",
        model: "claude-sonnet-4-6",
      });
    });

    it("should use default provider if none specified", () => {
      expect(parseModelRef("claude-3-5-sonnet", "anthropic")).toEqual({
        provider: "anthropic",
        model: "claude-3-5-sonnet",
      });
    });

    it("normalizes deprecated google flash preview ids to the working model id", () => {
      expect(parseModelRef("google/gemini-3.1-flash-preview", "openai")).toEqual({
        provider: "google",
        model: "gemini-3-flash-preview",
      });
      expect(parseModelRef("gemini-3.1-flash-preview", "google")).toEqual({
        provider: "google",
        model: "gemini-3-flash-preview",
      });
    });

    it("normalizes gemini 3.1 flash-lite to the preview model id", () => {
      expect(parseModelRef("google/gemini-3.1-flash-lite", "openai")).toEqual({
        provider: "google",
        model: "gemini-3.1-flash-lite-preview",
      });
      expect(parseModelRef("gemini-3.1-flash-lite", "google")).toEqual({
        provider: "google",
        model: "gemini-3.1-flash-lite-preview",
      });
    });

    it("keeps openai gpt-5.3 codex refs on the openai provider", () => {
      expect(parseModelRef("openai/gpt-5.3-codex", "anthropic")).toEqual({
        provider: "openai",
        model: "gpt-5.3-codex",
      });
      expect(parseModelRef("gpt-5.3-codex", "openai")).toEqual({
        provider: "openai",
        model: "gpt-5.3-codex",
      });
      expect(parseModelRef("openai/gpt-5.3-codex-codex", "anthropic")).toEqual({
        provider: "openai",
        model: "gpt-5.3-codex-codex",
      });
    });

    it("should return null for empty strings", () => {
      expect(parseModelRef("", "anthropic")).toBeNull();
      expect(parseModelRef("  ", "anthropic")).toBeNull();
    });

    it("should preserve openrouter/ prefix for native models", () => {
      expect(parseModelRef("openrouter/aurora-alpha", "openai")).toEqual({
        provider: "openrouter",
        model: "openrouter/aurora-alpha",
      });
    });

    it("should pass through openrouter external provider models as-is", () => {
      expect(parseModelRef("openrouter/anthropic/claude-sonnet-4-5", "openai")).toEqual({
        provider: "openrouter",
        model: "anthropic/claude-sonnet-4-5",
      });
    });

    it("normalizes Vercel Claude shorthand to anthropic-prefixed model ids", () => {
      expect(parseModelRef("vercel-ai-gateway/claude-opus-4.6", "openai")).toEqual({
        provider: "vercel-ai-gateway",
        model: "anthropic/claude-opus-4.6",
      });
      expect(parseModelRef("vercel-ai-gateway/opus-4.6", "openai")).toEqual({
        provider: "vercel-ai-gateway",
        model: "anthropic/claude-opus-4-6",
      });
    });

    it("keeps already-prefixed Vercel Anthropic models unchanged", () => {
      expect(parseModelRef("vercel-ai-gateway/anthropic/claude-opus-4.6", "openai")).toEqual({
        provider: "vercel-ai-gateway",
        model: "anthropic/claude-opus-4.6",
      });
    });

    it("passes through non-Claude Vercel model ids unchanged", () => {
      expect(parseModelRef("vercel-ai-gateway/openai/gpt-5.2", "openai")).toEqual({
        provider: "vercel-ai-gateway",
        model: "openai/gpt-5.2",
      });
    });

    it("should handle invalid slash usage", () => {
      expect(parseModelRef("/", "anthropic")).toBeNull();
      expect(parseModelRef("anthropic/", "anthropic")).toBeNull();
      expect(parseModelRef("/model", "anthropic")).toBeNull();
    });
  });

  describe("inferUniqueProviderFromConfiguredModels", () => {
    it("infers provider when configured model match is unique", () => {
      const cfg = {
        agents: {
          defaults: {
            models: {
              "anthropic/claude-sonnet-4-6": {},
            },
          },
        },
      } as OpenClawConfig;

      expect(
        inferUniqueProviderFromConfiguredModels({
          cfg,
          model: "claude-sonnet-4-6",
        }),
      ).toBe("anthropic");
    });

    it("returns undefined when configured matches are ambiguous", () => {
      const cfg = {
        agents: {
          defaults: {
            models: {
              "anthropic/claude-sonnet-4-6": {},
              "minimax/claude-sonnet-4-6": {},
            },
          },
        },
      } as OpenClawConfig;

      expect(
        inferUniqueProviderFromConfiguredModels({
          cfg,
          model: "claude-sonnet-4-6",
        }),
      ).toBeUndefined();
    });

    it("returns undefined for provider-prefixed model ids", () => {
      const cfg = {
        agents: {
          defaults: {
            models: {
              "anthropic/claude-sonnet-4-6": {},
            },
          },
        },
      } as OpenClawConfig;

      expect(
        inferUniqueProviderFromConfiguredModels({
          cfg,
          model: "anthropic/claude-sonnet-4-6",
        }),
      ).toBeUndefined();
    });

    it("infers provider for slash-containing model id when allowlist match is unique", () => {
      const cfg = {
        agents: {
          defaults: {
            models: {
              "vercel-ai-gateway/anthropic/claude-sonnet-4-6": {},
            },
          },
        },
      } as OpenClawConfig;

      expect(
        inferUniqueProviderFromConfiguredModels({
          cfg,
          model: "anthropic/claude-sonnet-4-6",
        }),
      ).toBe("vercel-ai-gateway");
    });
  });

  describe("buildModelAliasIndex", () => {
    it("should build alias index from config", () => {
      const cfg: Partial<OpenClawConfig> = {
        agents: {
          defaults: {
            models: {
              "anthropic/claude-3-5-sonnet": { alias: "fast" },
              "openai/gpt-4o": { alias: "smart" },
            },
          },
        },
      };

      const index = buildModelAliasIndex({
        cfg: cfg as OpenClawConfig,
        defaultProvider: "anthropic",
      });

      expect(index.byAlias.get("fast")?.ref).toEqual({
        provider: "anthropic",
        model: "claude-3-5-sonnet",
      });
      expect(index.byAlias.get("smart")?.ref).toEqual({ provider: "openai", model: "gpt-4o" });
      expect(index.byKey.get(modelKey("anthropic", "claude-3-5-sonnet"))).toEqual(["fast"]);
    });
  });

  describe("buildAllowedModelSet", () => {
    it("keeps explicitly allowlisted models even when missing from bundled catalog", () => {
      const result = buildAllowedModelSet({
        cfg: EXPLICIT_ALLOWLIST_CONFIG,
        catalog: BUNDLED_ALLOWLIST_CATALOG,
        defaultProvider: "anthropic",
      });

      expect(result.allowAny).toBe(false);
      expect(result.allowedKeys.has("anthropic/claude-sonnet-4-6")).toBe(true);
      expect(result.allowedCatalog).toEqual([
        { provider: "anthropic", id: "claude-sonnet-4-6", name: "claude-sonnet-4-6" },
      ]);
    });
  });

  describe("resolveAllowedModelRef", () => {
    it("accepts explicit allowlist refs absent from bundled catalog", () => {
      const result = resolveAllowedModelRef({
        cfg: EXPLICIT_ALLOWLIST_CONFIG,
        catalog: BUNDLED_ALLOWLIST_CATALOG,
        raw: "anthropic/claude-sonnet-4-6",
        defaultProvider: "openai",
        defaultModel: "gpt-5.2",
      });

      expect(result).toEqual({
        key: "anthropic/claude-sonnet-4-6",
        ref: { provider: "anthropic", model: "claude-sonnet-4-6" },
      });
    });

    it("strips trailing auth profile suffix before allowlist matching", () => {
      const cfg: OpenClawConfig = {
        agents: {
          defaults: {
            models: {
              "openai/@cf/openai/gpt-oss-20b": {},
            },
          },
        },
      } as OpenClawConfig;

      const result = resolveAllowedModelRef({
        cfg,
        catalog: [],
        raw: "openai/@cf/openai/gpt-oss-20b@cf:default",
        defaultProvider: "anthropic",
      });

      expect(result).toEqual({
        key: "openai/@cf/openai/gpt-oss-20b",
        ref: { provider: "openai", model: "@cf/openai/gpt-oss-20b" },
      });
    });
  });

  describe("resolveModelRefFromString", () => {
    it("should resolve from string with alias", () => {
      const index = {
        byAlias: new Map([
          ["fast", { alias: "fast", ref: { provider: "anthropic", model: "sonnet" } }],
        ]),
        byKey: new Map(),
      };

      const resolved = resolveModelRefFromString({
        raw: "fast",
        defaultProvider: "openai",
        aliasIndex: index,
      });

      expect(resolved?.ref).toEqual({ provider: "anthropic", model: "sonnet" });
      expect(resolved?.alias).toBe("fast");
    });

    it("should resolve direct ref if no alias match", () => {
      const resolved = resolveModelRefFromString({
        raw: "openai/gpt-4",
        defaultProvider: "anthropic",
      });
      expect(resolved?.ref).toEqual({ provider: "openai", model: "gpt-4" });
    });

    it("strips trailing profile suffix for simple model refs", () => {
      const resolved = resolveModelRefFromString({
        raw: "gpt-5@myprofile",
        defaultProvider: "openai",
      });
      expect(resolved?.ref).toEqual({ provider: "openai", model: "gpt-5" });
    });

    it("strips trailing profile suffix for provider/model refs", () => {
      const resolved = resolveModelRefFromString({
        raw: "google/gemini-flash-latest@google:bevfresh",
        defaultProvider: "anthropic",
      });
      expect(resolved?.ref).toEqual({
        provider: "google",
        model: "gemini-flash-latest",
      });
    });

    it("preserves Cloudflare @cf model segments", () => {
      const resolved = resolveModelRefFromString({
        raw: "openai/@cf/openai/gpt-oss-20b",
        defaultProvider: "anthropic",
      });
      expect(resolved?.ref).toEqual({
        provider: "openai",
        model: "@cf/openai/gpt-oss-20b",
      });
    });

    it("preserves OpenRouter @preset model segments", () => {
      const resolved = resolveModelRefFromString({
        raw: "openrouter/@preset/kimi-2-5",
        defaultProvider: "anthropic",
      });
      expect(resolved?.ref).toEqual({
        provider: "openrouter",
        model: "@preset/kimi-2-5",
      });
    });

    it("splits trailing profile suffix after OpenRouter preset paths", () => {
      const resolved = resolveModelRefFromString({
        raw: "openrouter/@preset/kimi-2-5@work",
        defaultProvider: "anthropic",
      });
      expect(resolved?.ref).toEqual({
        provider: "openrouter",
        model: "@preset/kimi-2-5",
      });
    });

    it("strips profile suffix before alias resolution", () => {
      const index = {
        byAlias: new Map([
          ["kimi", { alias: "kimi", ref: { provider: "nvidia", model: "moonshotai/kimi-k2.5" } }],
        ]),
        byKey: new Map(),
      };

      const resolved = resolveModelRefFromString({
        raw: "kimi@nvidia:default",
        defaultProvider: "openai",
        aliasIndex: index,
      });
      expect(resolved?.ref).toEqual({
        provider: "nvidia",
        model: "moonshotai/kimi-k2.5",
      });
      expect(resolved?.alias).toBe("kimi");
    });
  });

  describe("resolveConfiguredModelRef", () => {
    it("should fall back to anthropic and warn if provider is missing for non-alias", () => {
      setLoggerOverride({ level: "silent", consoleLevel: "warn" });
      const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
      try {
        const cfg: Partial<OpenClawConfig> = {
          agents: {
            defaults: {
              model: { primary: "claude-3-5-sonnet" },
            },
          },
        };

        const result = resolveConfiguredModelRef({
          cfg: cfg as OpenClawConfig,
          defaultProvider: "google",
          defaultModel: "gemini-pro",
        });

        expect(result).toEqual({ provider: "anthropic", model: "claude-3-5-sonnet" });
        expect(warnSpy).toHaveBeenCalledWith(
          expect.stringContaining('Falling back to "anthropic/claude-3-5-sonnet"'),
        );
      } finally {
        setLoggerOverride(null);
        resetLogger();
      }
    });

    it("sanitizes control characters in providerless-model warnings", () => {
      setLoggerOverride({ level: "silent", consoleLevel: "warn" });
      const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
      try {
        const cfg: Partial<OpenClawConfig> = {
          agents: {
            defaults: {
              model: { primary: "\u001B[31mclaude-3-5-sonnet\nspoof" },
            },
          },
        };

        const result = resolveConfiguredModelRef({
          cfg: cfg as OpenClawConfig,
          defaultProvider: "google",
          defaultModel: "gemini-pro",
        });

        expect(result).toEqual({
          provider: "anthropic",
          model: "\u001B[31mclaude-3-5-sonnet\nspoof",
        });
        const warning = warnSpy.mock.calls[0]?.[0] as string;
        expect(warning).toContain('Falling back to "anthropic/claude-3-5-sonnet"');
        expect(warning).not.toContain("\u001B");
        expect(warning).not.toContain("\n");
      } finally {
        warnSpy.mockRestore();
        setLoggerOverride(null);
        resetLogger();
      }
    });

    it("should use default provider/model if config is empty", () => {
      const cfg: Partial<OpenClawConfig> = {};
      const result = resolveConfiguredModelRef({
        cfg: cfg as OpenClawConfig,
        defaultProvider: "openai",
        defaultModel: "gpt-4",
      });
      expect(result).toEqual({ provider: "openai", model: "gpt-4" });
    });

    it("should prefer configured custom provider when default provider is not in models.providers", () => {
      const cfg: Partial<OpenClawConfig> = {
        models: {
          providers: {
            n1n: {
              baseUrl: "https://n1n.example.com",
              models: [
                {
                  id: "gpt-5.4",
                  name: "GPT 5.4",
                  reasoning: false,
                  input: ["text"],
                  cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
                  contextWindow: 128000,
                  maxTokens: 4096,
                },
              ],
            },
          },
        },
      };
      const result = resolveConfiguredModelRef({
        cfg: cfg as OpenClawConfig,
        defaultProvider: "anthropic",
        defaultModel: "claude-opus-4-6",
      });
      expect(result).toEqual({ provider: "n1n", model: "gpt-5.4" });
    });

    it("should keep default provider when it is in models.providers", () => {
      const cfg: Partial<OpenClawConfig> = {
        models: {
          providers: {
            anthropic: {
              baseUrl: "https://api.anthropic.com",
              models: [
                {
                  id: "claude-opus-4-6",
                  name: "Claude Opus 4.6",
                  reasoning: true,
                  input: ["text", "image"],
                  cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
                  contextWindow: 200000,
                  maxTokens: 4096,
                },
              ],
            },
          },
        },
      };
      const result = resolveConfiguredModelRef({
        cfg: cfg as OpenClawConfig,
        defaultProvider: "anthropic",
        defaultModel: "claude-opus-4-6",
      });
      expect(result).toEqual({ provider: "anthropic", model: "claude-opus-4-6" });
    });

    it("should fall back to hardcoded default when no custom providers have models", () => {
      const cfg: Partial<OpenClawConfig> = {
        models: {
          providers: {
            "empty-provider": {
              baseUrl: "https://example.com",
              models: [],
            },
          },
        },
      };
      const result = resolveConfiguredModelRef({
        cfg: cfg as OpenClawConfig,
        defaultProvider: "anthropic",
        defaultModel: "claude-opus-4-6",
      });
      expect(result).toEqual({ provider: "anthropic", model: "claude-opus-4-6" });
    });

    it("should warn when specified model cannot be resolved and falls back to default", () => {
      setLoggerOverride({ level: "silent", consoleLevel: "warn" });
      const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
      try {
        const cfg: Partial<OpenClawConfig> = {
          agents: {
            defaults: {
              model: { primary: "openai/" },
            },
          },
        };

        const result = resolveConfiguredModelRef({
          cfg: cfg as OpenClawConfig,
          defaultProvider: "anthropic",
          defaultModel: "claude-opus-4-6",
        });

        expect(result).toEqual({ provider: "anthropic", model: "claude-opus-4-6" });
        expect(warnSpy).toHaveBeenCalledWith(
          expect.stringContaining('Falling back to default "anthropic/claude-opus-4-6"'),
        );
      } finally {
        warnSpy.mockRestore();
        setLoggerOverride(null);
        resetLogger();
      }
    });
  });

  describe("resolveThinkingDefault", () => {
    it("prefers per-model params.thinking over global thinkingDefault", () => {
      const cfg = {
        agents: {
          defaults: {
            thinkingDefault: "low",
            models: {
              "anthropic/claude-opus-4-6": {
                params: { thinking: "high" },
              },
            },
          },
        },
      } as OpenClawConfig;

      expect(resolveAnthropicOpusThinking(cfg)).toBe("high");
    });

    it("accepts per-model params.thinking=adaptive", () => {
      const cfg = {
        agents: {
          defaults: {
            models: {
              "anthropic/claude-opus-4-6": {
                params: { thinking: "adaptive" },
              },
            },
          },
        },
      } as OpenClawConfig;

      expect(resolveAnthropicOpusThinking(cfg)).toBe("adaptive");
    });

    it("defaults Anthropic Claude 4.6 models to adaptive", () => {
      const cfg = {} as OpenClawConfig;

      expect(resolveAnthropicOpusThinking(cfg)).toBe("adaptive");

      expect(
        resolveThinkingDefault({
          cfg,
          provider: "amazon-bedrock",
          model: "us.anthropic.claude-sonnet-4-6-v1:0",
          catalog: [
            {
              provider: "amazon-bedrock",
              id: "us.anthropic.claude-sonnet-4-6-v1:0",
              name: "Claude Sonnet 4.6",
              reasoning: true,
            },
          ],
        }),
      ).toBe("adaptive");
    });
  });
});

describe("normalizeModelSelection", () => {
  it("returns trimmed string for string input", () => {
    expect(normalizeModelSelection("ollama/llama3.2:3b")).toBe("ollama/llama3.2:3b");
  });

  it("returns undefined for empty/whitespace string", () => {
    expect(normalizeModelSelection("")).toBeUndefined();
    expect(normalizeModelSelection("   ")).toBeUndefined();
  });

  it("extracts primary from object", () => {
    expect(normalizeModelSelection({ primary: "google/gemini-2.5-flash" })).toBe(
      "google/gemini-2.5-flash",
    );
  });

  it("returns undefined for object without primary", () => {
    expect(normalizeModelSelection({ fallbacks: ["a"] })).toBeUndefined();
    expect(normalizeModelSelection({})).toBeUndefined();
  });

  it("returns undefined for null/undefined/number", () => {
    expect(normalizeModelSelection(undefined)).toBeUndefined();
    expect(normalizeModelSelection(null)).toBeUndefined();
    expect(normalizeModelSelection(42)).toBeUndefined();
  });
});