local adapter = {}

adapter.name = "mistral"
adapter.version = "2.0.0"
adapter.endpoint = "/v1/chat/completions"
adapter.headers = {}

-- Mistral API is OpenAI-compatible, just passes through
function adapter.transform_request(raw_body)
    local ok, req = pcall(json.decode, raw_body)
    if not ok then return raw_body end
    req.model = req.model or "mistral-large-latest"
    req.temperature = req.temperature or 0.7
    req.max_tokens = req.max_tokens or 4096
    req.stream = req.stream or false
    -- The gateway's private control fields are GONE from the body (v2): the
    -- neutral `thinking` field carries that intent and each adapter maps it in
    -- its own protocol terms. These upstreams have no thinking switch at all,
    -- so the field is simply dropped here — which is what the nil-ing below
    -- used to do, except the field being dropped is no longer the kernel's
    -- private one.
    req.thinking = nil
    req.extra_body = nil
    return json.encode(req)
end

function adapter.transform_response(raw_body)
    -- 非流式 OpenAI 响应 → 统一信封。此前在 openai/groq/kimicode/mistral/github
    -- 五个适配器里**逐字节相同**（各 2206B，diff 为空），已抽到共享前导。
    return __prelude.openai_response(raw_body)
end

function adapter.transform_stream_chunk(raw_chunk)
    -- 标准 OpenAI SSE → 统一信封。该实现此前在 groq/kimicode/mistral/github
    -- 四个适配器里**逐字节重复**（各 2211B），已抽到共享前导。
    return __prelude.openai_stream_chunk(raw_chunk)
end

-- 错误收敛：Mistral 用顶层 {message="...", type="..."}（非嵌套 error）
function adapter.transform_error(status, body)
    local ok, resp = pcall(json.decode, body)
    if not ok or type(resp) ~= "table" then return nil end
    if type(resp.message) == "string" then
        return resp.message
    end
    return nil
end

return adapter