package main

import (
	"context"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"time"

	"data-terminal-cloud/internal/agenteval"

	"github.com/google/uuid"
)

func main() {
	os.Exit(run(os.Args[1:], os.Stdout, os.Stderr))
}

func run(args []string, stdout, stderr io.Writer) int {
	flags := flag.NewFlagSet("agent-eval-register", flag.ContinueOnError)
	flags.SetOutput(stderr)
	suitePath := flags.String("suite", "", "评测集JSON路径")
	observationsPath := flags.String("observations", "", "生成本报告的脱敏观测JSON路径")
	reportPath := flags.String("report", "", "agent-eval生成的完整报告路径")
	tenantID := flags.String("tenant", "", "运营范围客户组织UUID")
	configID := flags.String("config", "", "待登记证据的运行配置版本UUID")
	apiBaseURL := flags.String("api", "http://127.0.0.1:58080", "SaaS API基础地址")
	tokenFile := flags.String("access-token-file", "", "OIDC访问令牌文件；省略时读取AGENT_EVAL_ACCESS_TOKEN")
	allowFailed := flags.Bool("allow-failed", false, "明确允许登记FAILED报告；FAILED不会满足发布门禁")
	dryRun := flags.Bool("dry-run", false, "只校验并显示登记摘要，不发送请求")
	if err := flags.Parse(args); err != nil {
		return 2
	}
	if *suitePath == "" || *observationsPath == "" || *reportPath == "" || *tenantID == "" || *configID == "" || flags.NArg() != 0 {
		fmt.Fprintln(stderr, "usage: agent-eval-register -suite <suite.json> -observations <observations.json> -report <report.json> -tenant <uuid> -config <uuid> [-api <url>] [-access-token-file <path>] [-allow-failed] [-dry-run]")
		return 2
	}
	if _, err := uuid.Parse(*tenantID); err != nil {
		fmt.Fprintln(stderr, "tenant必须是有效UUID")
		return 2
	}
	if _, err := uuid.Parse(*configID); err != nil {
		fmt.Fprintln(stderr, "config必须是有效UUID")
		return 2
	}
	var suite agenteval.Suite
	if err := decodeFile(*suitePath, &suite); err != nil {
		fmt.Fprintf(stderr, "读取评测集失败: %v\n", err)
		return 2
	}
	var artifact agenteval.Artifact
	if err := decodeFile(*reportPath, &artifact); err != nil {
		fmt.Fprintf(stderr, "读取评测报告失败: %v\n", err)
		return 2
	}
	var observations agenteval.ObservationRun
	if err := decodeFile(*observationsPath, &observations); err != nil {
		fmt.Fprintf(stderr, "读取评测观测失败: %v\n", err)
		return 2
	}
	if err := agenteval.ValidateArtifact(suite, observations, artifact, *allowFailed); err != nil {
		fmt.Fprintf(stderr, "评测报告不能登记: %v\n", err)
		return 2
	}
	key, err := agenteval.RegistrationIdempotencyKey(*configID, artifact.RegistrationPayload)
	if err != nil {
		fmt.Fprintf(stderr, "生成幂等键失败: %v\n", err)
		return 2
	}
	if *dryRun {
		summary := map[string]any{
			"dry_run": true, "tenant_id": *tenantID, "config_version_id": *configID,
			"suite_version": artifact.Report.SuiteVersion, "suite_sha256": artifact.Report.SuiteSHA256,
			"agent_version": artifact.Report.AgentVersion, "result": artifact.Report.Result,
			"report_ref": artifact.RegistrationPayload.ReportRef, "idempotency_key": key,
		}
		_ = json.NewEncoder(stdout).Encode(summary)
		return 0
	}
	token, err := readToken(*tokenFile)
	if err != nil {
		fmt.Fprintf(stderr, "读取访问令牌失败: %v\n", err)
		return 2
	}
	registrar, err := agenteval.NewRegistrar(*apiBaseURL, token, &http.Client{Timeout: 15 * time.Second})
	if err != nil {
		fmt.Fprintf(stderr, "创建登记客户端失败: %v\n", err)
		return 2
	}
	result, err := registrar.Register(context.Background(), *tenantID, *configID, artifact.RegistrationPayload)
	if err != nil {
		fmt.Fprintf(stderr, "登记评测证据失败: %v；request_id=%s\n", err, result.RequestID)
		return 1
	}
	_ = json.NewEncoder(stdout).Encode(map[string]any{
		"evaluation_id": result.EvaluationID, "status_code": result.StatusCode,
		"idempotency_replayed": result.Replayed, "request_id": result.RequestID,
		"idempotency_key": key,
	})
	return 0
}

func readToken(path string) (string, error) {
	if strings.TrimSpace(path) == "" {
		value := strings.TrimSpace(os.Getenv("AGENT_EVAL_ACCESS_TOKEN"))
		if value == "" {
			return "", errors.New("set AGENT_EVAL_ACCESS_TOKEN or -access-token-file")
		}
		return value, nil
	}
	content, err := os.ReadFile(path)
	if err != nil {
		return "", err
	}
	value := strings.TrimSpace(string(content))
	if value == "" || strings.ContainsAny(value, "\r\n\x00") {
		return "", errors.New("token file must contain one non-empty line")
	}
	return value, nil
}

func decodeFile(path string, target any) error {
	file, err := os.Open(path)
	if err != nil {
		return err
	}
	defer file.Close()
	decoder := json.NewDecoder(file)
	decoder.DisallowUnknownFields()
	if err = decoder.Decode(target); err != nil {
		return err
	}
	var trailing any
	if err = decoder.Decode(&trailing); !errors.Is(err, io.EOF) {
		if err == nil {
			return errors.New("JSON文件包含多个顶层值")
		}
		return err
	}
	return nil
}