flowchart LR
    CC["<b>Claude Code</b><br/>Anthropic SDK"]
    Proxy["<b>MiniMax-Claude-Proxy</b>"]
    Upstream["<b>MiniMax-M3</b><br/>/anthropic API"]
    DB[("SQLite<br/>cache.db")]

    CC -- "POST /v1/messages<br/>(SSE stream)" --> Proxy

    subgraph PRE["前置 pipeline"]
        direction TB
        P1["model_mapping<br/>(claude-* → MiniMax-M3)"]
        P2["cache_control_strip"]
        P3["thinking.preprocess<br/>(注入 system)"]
        P4["schema.preprocess<br/>(拍平 $ref/oneOf)"]
        P5["ssr_tools.preprocess<br/>(翻译为普通工具)"]
        P6["multimodal.preprocess<br/>(图片/PDF)"]
        P7["cache.touch_prefix<br/>(注入 usage 占位)"]
        P1 --> P2 --> P3 --> P4 --> P5 --> P6 --> P7
    end

    subgraph POST["后置 pipeline"]
        direction TB
        Q1["thinking.stream_transformer<br/>(拆标签)"]
        Q2["sse.wrap<br/>(心跳+tool_use 缓冲+占位)"]
        Q3["schema.postprocess<br/>(嵌套还原)"]
        Q4["ssr_tools.execute<br/>(本地工具+回灌)"]
        Q1 --> Q2 --> Q3 --> Q4
    end

    Proxy -- "请求" --> PRE
    PRE -- "清洗后 payload" --> Upstream
    Upstream -- "SSE/JSON 响应" --> POST
    POST -- "客户端透明<br/>(cache_control/thinking/schema 都还原)" --> CC
    PRE -.读/写.-> DB
    POST -.读/写.-> DB

    classDef upstream fill:#fef3c7,stroke:#d97706,color:#000
    classDef proxy fill:#dbeafe,stroke:#1d4ed8,color:#000
    classDef store fill:#f3e8ff,stroke:#7c3aed,color:#000
    class Upstream upstream
    class Proxy proxy
    class DB store

flowchart LR
    subgraph Front["📥 请求进入"]
        A1["① 缓存命中?<br/>查 SQLite prefix"]
        A2["② thinking 标签<br/>注入 system"]
        A3["③ schema 拍平<br/>oneOf/anyOf → flat"]
        A4["④ 多模态预处理<br/>图片缩放/PDF 拆页"]
        A5["⑤ 模型重映射<br/>claude-* → MiniMax-M3"]
        A6["⑥ SSR 工具翻译<br/>web_search 改普通 tool"]
    end

    subgraph Back["📤 响应回传"]
        B1["① 用量占位回填<br/>cache_*/read tokens"]
        B2["② thinking 块拆分<br/>标签 → thinking block"]
        B3["③ 嵌套还原<br/>flat → 原始 oneOf 结构"]
        B4["④ 媒体直出<br/>(已是 base64)"]
        B5["⑤ 模型 ID 一致"]
        B6["⑥ SSR 工具执行<br/>本地实现 + round-2 回灌"]
    end

    Front --> Up["🚀 上游<br/>MiniMax-M3"] --> Back

xychart-beta
    title "二次请求命中缓存耗时（毫秒）"
    x-axis ["首次", "二次命中", "schema 命中", "tool_use 命中"]
    y-axis "耗时 (ms)" 0 --> 2200
    bar [2170, 10, 10, 10]