package eval

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"
)

// ModelID asks llama-server which model it has loaded, so a scoring run can
// label itself. Without this a bake-off between two models produces two tables
// that look identical, and the operator has to remember which server was up.
//
// Read from the server rather than passed in on purpose: a hand-typed label
// goes stale the moment someone restarts the server with a different -m.
func ModelID(ctx context.Context, base string) (string, error) {
	req, err := http.NewRequestWithContext(ctx, "GET", strings.TrimSuffix(base, "/")+"/v1/models", nil)
	if err != nil {
		return "", err
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	if resp.StatusCode != 200 {
		return "", fmt.Errorf("models: status %d", resp.StatusCode)
	}
	var out struct {
		Data []struct {
			ID string `json:"id"`
		} `json:"data"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
		return "", err
	}
	if len(out.Data) == 0 {
		return "", fmt.Errorf("models: empty list")
	}
	return shortModelID(out.Data[0].ID), nil
}

// shortModelID trims the path and the .gguf suffix — llama-server reports the
// file name it was started with, which is too long for a table header.
func shortModelID(id string) string {
	if i := strings.LastIndexAny(id, "/\\"); i >= 0 {
		id = id[i+1:]
	}
	return strings.TrimSuffix(id, ".gguf")
}