import { describe, expect, it } from "vitest";

import {
  GPT_CONTEXT_WINDOW_CAP,
  resolveModelMetadata,
  type KnownModelMetadata,
  type PresetModelSource,
} from "@/lib/modelMetadata";
import type { ModelsDevResponse } from "@/lib/modelsDev";

const modelsDev: ModelsDevResponse = {
  zhipuai: {
    id: "zhipuai",
    api: "https://open.bigmodel.cn/api/paas/v4",
    models: {
      "glm-5": {
        id: "glm-5",
        limit: { context: 204800, output: 131072 },
        reasoning: true,
        reasoning_options: [
          { type: "toggle" },
          { type: "effort", values: ["high"] },
        ],
        modalities: { input: ["text"], output: ["text"] },
        cost: { input: 1, output: 3.2 },
      },
    },
  },
  zai: {
    id: "zai",
    api: "https://api.z.ai/api/paas/v4",
    models: {
      "glm-5": { id: "glm-5", limit: { context: 200000, output: 128000 } },
    },
  },
  "zai-coding-plan": {
    id: "zai-coding-plan",
    api: "https://api.z.ai/api/coding/paas/v4",
    models: {
      "glm-5": {
        id: "glm-5",
        limit: { context: 202752, output: 98304 },
        cost: { input: 0, output: 0 },
      },
    },
  },
  "opencode-go": {
    id: "opencode-go",
    api: "https://opencode.ai/zen/go/v1",
    models: {
      "glm-5.3": {
        id: "glm-5.3",
        limit: { context: 1000000, output: 131072 },
        reasoning_options: [{ type: "effort", values: ["low", "high", "max"] }],
      },
    },
  },
  openrouter: {
    id: "openrouter",
    api: "https://openrouter.ai/api/v1",
    models: {
      "z-ai/glm-5": {
        id: "z-ai/glm-5",
        limit: { context: 202800 },
        canonical_model_id: "zhipuai/glm-5",
      },
      "someone/kimi-k9": {
        id: "someone/kimi-k9",
        limit: { context: 65536 },
        canonical_model_id: "moonshotai/kimi-k9",
      },
      "minimax/minimax-m9": {
        id: "minimax/minimax-m9",
        canonical_model_id: "minimax/MiniMax-M9",
      },
      "nvidia/nemotron-9": {
        id: "nvidia/nemotron-9",
        canonical_model_id: "nvidia/nemotron-9",
      },
    },
  },
  minimax: {
    id: "minimax",
    models: {
      "MiniMax-M9": { id: "MiniMax-M9", limit: { context: 204800 } },
    },
  },
  // 本身是原厂（有条目指向它），也托管别家的模型，且这些条目不指向原厂。
  nvidia: {
    id: "nvidia",
    models: {
      "nemotron-9": { id: "nemotron-9" },
      "minimaxai/minimax-m9": {
        id: "minimaxai/minimax-m9",
        limit: { context: 196608 },
      },
    },
  },
  moonshotai: {
    id: "moonshotai",
    api: "https://api.moonshot.ai/v1",
    models: {
      "kimi-k9": { id: "kimi-k9", limit: { context: 262144 } },
    },
  },
  other: {
    id: "other",
    models: {
      "kimi-k9": {
        id: "kimi-k9",
        limit: { context: 100000 },
        canonical_model_id: "elsewhere/kimi-k9",
      },
    },
  },
  elsewhere: {
    id: "elsewhere",
    models: { "kimi-k9": { id: "kimi-k9", limit: { context: 50000 } } },
  },
  // 原厂名下没有 deepseek-v9-flash-1017，各家条目都指向它却落空。
  deepseek: {
    id: "deepseek",
    models: { "deepseek-flash": { id: "deepseek-flash" } },
  },
  "ds-relay": {
    id: "ds-relay",
    models: {
      "deepseek-v9-flash-1017": {
        id: "deepseek-v9-flash-1017",
        limit: { context: 1000000 },
        modalities: { input: ["text", "image"], output: ["text"] },
        canonical_model_id: "deepseek/deepseek-v9-flash-1017",
      },
      "tinker/inkling-9": {
        id: "tinker/inkling-9",
        canonical_model_id: "tinker/inkling-9",
      },
    },
  },
  // 原厂（有条目指向它），也托管别家的微调条目，这些条目指回别家原厂。
  tinker: {
    id: "tinker",
    models: {
      "inkling-9": { id: "inkling-9" },
      "deepseek-ai/DeepSeek-V9-Flash-1017:peft:262144": {
        id: "deepseek-ai/DeepSeek-V9-Flash-1017:peft:262144",
        limit: { context: 262144 },
        modalities: { input: ["text"], output: ["text"] },
        canonical_model_id: "deepseek/deepseek-v9-flash-1017",
      },
      "poolside/Laguna-9": {
        id: "poolside/Laguna-9",
        limit: { context: 65536 },
        canonical_model_id: "poolside/laguna-9",
      },
    },
  },
  // 原厂自己的条目指向自己，但 ID 写法和指向的不一致，指向也落空。
  poolside: {
    id: "poolside",
    models: {
      "poolside/laguna-9": {
        id: "poolside/laguna-9",
        limit: { context: 262144 },
        canonical_model_id: "poolside/laguna-9",
      },
    },
  },
};

const preset = (
  baseUrl: string,
  models: Record<string, KnownModelMetadata>,
): PresetModelSource => ({ baseUrl, models: new Map(Object.entries(models)) });

describe("resolveModelMetadata", () => {
  it("uses the provider recognized by its API address", () => {
    expect(
      resolveModelMetadata("glm-5.3", {
        baseUrl: "https://opencode.ai/zen/go/v1/",
        modelsDev,
      }),
    ).toMatchObject({
      contextWindow: 1000000,
      maxOutputTokens: 131072,
      reasoningEfforts: ["low", "high", "max"],
    });
  });

  it("prefers the provider whose path matches the address best", () => {
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://api.z.ai/api/coding/paas/v4",
        modelsDev,
      })?.contextWindow,
    ).toBe(202752);
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://api.z.ai/api/paas/v4",
        modelsDev,
      })?.contextWindow,
    ).toBe(200000);
  });

  it("matches ids case-insensitively and across namespaces", () => {
    expect(
      resolveModelMetadata("Z-AI/GLM-5", {
        baseUrl: "https://openrouter.ai/api/v1",
        modelsDev,
      })?.contextWindow,
    ).toBe(202800);
    expect(
      resolveModelMetadata("zai-org/glm-5", {
        baseUrl: "https://open.bigmodel.cn/api/paas/v4",
        modelsDev,
      })?.contextWindow,
    ).toBe(204800);
  });

  it("falls back to the vendor entry without carrying its price", () => {
    const metadata = resolveModelMetadata("glm-5", {
      baseUrl: "https://relay.example.com/v1",
      modelsDev,
    });
    expect(metadata).toMatchObject({
      contextWindow: 204800,
      reasoning: true,
      inputModalities: ["text"],
      reasoningEfforts: ["high"],
      sources: ["models-dev"],
    });
    expect(metadata?.cost).toBeUndefined();
  });

  it("keeps the price when the provider itself is recognized", () => {
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://open.bigmodel.cn/api/paas/v4",
        modelsDev,
      }),
    ).toMatchObject({
      cost: { input: 1, output: 3.2 },
      reasoningEfforts: ["high"],
    });
  });

  it("ignores a vendor hosting another vendor's model", () => {
    expect(
      resolveModelMetadata("MiniMax-M9", {
        baseUrl: "https://relay.example.com/v1",
        modelsDev,
      })?.contextWindow,
    ).toBe(204800);
  });

  it("does not borrow an entry that points at another vendor", () => {
    expect(
      resolveModelMetadata("DeepSeek-v9-flash-1017", {
        baseUrl: "https://relay.example.com/v1",
        modelsDev,
      }),
    ).toBeNull();
  });

  it("still uses the vendor's own entry when its pointer is dangling", () => {
    expect(
      resolveModelMetadata("laguna-9", {
        baseUrl: "https://relay.example.com/v1",
        modelsDev,
      })?.contextWindow,
    ).toBe(262144);
  });

  it("gives up when the same name points at different vendors", () => {
    expect(
      resolveModelMetadata("kimi-k9", {
        baseUrl: "https://relay.example.com/v1",
        modelsDev,
      }),
    ).toBeNull();
  });

  it("lets the matching preset row win field by field", () => {
    const presets = [
      preset("https://api.z.ai/api/coding/paas/v4", {
        "glm-5": { contextWindow: 500000 },
      }),
      preset("https://relay.example.com/v1", {
        "glm-5": { contextWindow: 1 },
      }),
    ];
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://api.z.ai/api/coding/paas/v4",
        presets,
        modelsDev,
      }),
    ).toMatchObject({
      contextWindow: 500000,
      maxOutputTokens: 98304,
      sources: ["preset", "models-dev"],
    });
  });

  it("does not take another plan's preset on the same host", () => {
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://api.z.ai/api/paas/v4",
        presets: [
          preset("https://api.z.ai/api/coding/paas/v4", {
            "glm-5": { contextWindow: 500000 },
          }),
        ],
        modelsDev,
      }),
    ).toMatchObject({ contextWindow: 200000, sources: ["models-dev"] });
  });

  it("accepts the same endpoint written with or without a version suffix", () => {
    expect(
      resolveModelMetadata("glm-5.3", {
        baseUrl: "https://opencode.ai/zen/go",
        modelsDev,
      })?.contextWindow,
    ).toBe(1000000);
  });

  it("matches the old OpenCode address to the entry models.dev moved to /inference", () => {
    const moved: ModelsDevResponse = {
      "opencode-go": {
        id: "opencode-go",
        api: "https://opencode.ai/inference/go/openai/v1",
        models: {
          "deepseek-v4.1-flash": {
            id: "deepseek-v4.1-flash",
            limit: { context: 1000000 },
            reasoning: true,
            modalities: { input: ["text", "image"], output: ["text"] },
          },
        },
      },
      opencode: {
        id: "opencode",
        api: "https://opencode.ai/inference/openai/v1",
        models: {
          "deepseek-v4.1-flash": {
            id: "deepseek-v4.1-flash",
            limit: { context: 200000 },
          },
        },
      },
    };
    expect(
      resolveModelMetadata("deepseek-v4.1-flash", {
        baseUrl: "https://opencode.ai/zen/go/v1",
        modelsDev: moved,
      }),
    ).toMatchObject({
      contextWindow: 1000000,
      reasoning: true,
      inputModalities: ["text", "image"],
    });
    expect(
      resolveModelMetadata("deepseek-v4.1-flash", {
        baseUrl: "https://opencode.ai/zen/v1",
        modelsDev: moved,
      })?.contextWindow,
    ).toBe(200000);
  });

  it("does not treat a parent path as the plans nested under it", () => {
    expect(
      resolveModelMetadata("glm-5.3", {
        baseUrl: "https://opencode.ai/zen",
        presets: [
          preset("https://opencode.ai/zen/go/v1", {
            "glm-5.3": { contextWindow: 1 },
          }),
        ],
        modelsDev,
      }),
    ).toBeNull();
  });

  it("ignores a pasted request path after the base address", () => {
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://api.z.ai/api/coding/paas/v4/chat/completions",
        modelsDev,
      })?.contextWindow,
    ).toBe(202752);
  });

  it("fills fields the provider entry leaves out from the vendor entry", () => {
    const metadata = resolveModelMetadata("glm-5", {
      baseUrl: "https://api.z.ai/api/paas/v4",
      modelsDev,
    });
    expect(metadata).toMatchObject({
      contextWindow: 200000,
      maxOutputTokens: 128000,
      reasoning: true,
      inputModalities: ["text"],
    });
    expect(metadata?.cost).toBeUndefined();
  });

  it("uses presets alone when models.dev is unavailable", () => {
    expect(
      resolveModelMetadata("glm-5", {
        baseUrl: "https://api.z.ai/api/coding/paas/v4",
        presets: [
          preset("https://api.z.ai/api/coding/paas/v4", {
            "glm-5": { contextWindow: 500000 },
          }),
        ],
      }),
    ).toEqual({ contextWindow: 500000, sources: ["preset"] });
    expect(
      resolveModelMetadata("glm-5", { baseUrl: "https://api.z.ai/v1" }),
    ).toBeNull();
  });

  it("caps GPT windows only when they are borrowed from the vendor entry", () => {
    const openai: ModelsDevResponse = {
      openai: {
        id: "openai",
        api: "https://api.openai.com/v1",
        models: {
          "gpt-6-astra": {
            id: "gpt-6-astra",
            limit: { context: 1050000, output: 128000 },
          },
          "gpt-4o": { id: "gpt-4o", limit: { context: 128000 } },
          "o9-big": { id: "o9-big", limit: { context: 1050000 } },
        },
      },
      relay: {
        id: "relay",
        models: {
          "openai/gpt-6-astra": {
            id: "openai/gpt-6-astra",
            canonical_model_id: "openai/gpt-6-astra",
          },
        },
      },
      gateway: {
        id: "gateway",
        api: "https://gateway.example.com/v1",
        models: {
          "gpt-6-astra": {
            id: "gpt-6-astra",
            canonical_model_id: "openai/gpt-6-astra",
          },
        },
      },
    };
    const resolve = (id: string, baseUrl: string) =>
      resolveModelMetadata(id, { baseUrl, modelsDev: openai })?.contextWindow;

    // 认不出地址、借原厂条目的中转封顶，带命名空间的写法也一样。
    expect(resolve("gpt-6-astra", "https://relay.example.com/v1")).toBe(
      GPT_CONTEXT_WINDOW_CAP,
    );
    expect(resolve("openai/GPT-6-Astra", "https://relay.example.com/v1")).toBe(
      GPT_CONTEXT_WINDOW_CAP,
    );
    // 认出了地址但那家没写窗口，借来的原厂窗口同样封顶。
    expect(resolve("gpt-6-astra", "https://gateway.example.com/v1")).toBe(
      GPT_CONTEXT_WINDOW_CAP,
    );
    // 按地址认出的那家、同地址预设照用自己的值。
    expect(resolve("gpt-6-astra", "https://api.openai.com/v1")).toBe(1050000);
    expect(
      resolveModelMetadata("openai-gpt-6-astra", {
        baseUrl: "https://relay.example.com/v1",
        presets: [
          preset("https://relay.example.com/v1", {
            "openai-gpt-6-astra": { contextWindow: 1050000 },
          }),
        ],
        modelsDev: openai,
      })?.contextWindow,
    ).toBe(1050000);
    // 本来就小的 GPT 不往上抬，其他模型不受影响。
    expect(resolve("gpt-4o", "https://api.openai.com/v1")).toBe(128000);
    expect(resolve("o9-big", "https://api.openai.com/v1")).toBe(1050000);
  });
});