package orbit

import (
	"context"
	"errors"
	"net/url"
	"strconv"
)

func historyResourcePath(ids ...string) (string, error) {
	for _, id := range ids {
		if !validID(id) {
			return "", errors.New("invalid history resource id")
		}
	}
	path := "/v1/tasks/" + ids[0] + "/attempts"
	if len(ids) > 1 {
		path += "/" + ids[1] + "/evidence"
	}
	if len(ids) > 2 {
		path += "/" + ids[2]
	}
	return path, nil
}
func historyPageQuery(in HistoryPageRequest) (string, error) {
	if in.Limit < 0 || in.Limit > 100 || len(in.Cursor) > 1024 {
		return "", errors.New("invalid history limit or cursor")
	}
	q := url.Values{}
	if in.Limit > 0 {
		q.Set("limit", strconv.Itoa(in.Limit))
	}
	if in.Cursor != "" {
		q.Set("cursor", in.Cursor)
	}
	if len(q) == 0 {
		return "", nil
	}
	return "?" + q.Encode(), nil
}

// ListTaskAttempts 按执行代次降序读取摘要；当前查询不会授予执行权。
func (c *Client) ListTaskAttempts(ctx context.Context, taskID string, in HistoryPageRequest) (AttemptPage, error) {
	var out AttemptPage
	path, err := historyResourcePath(taskID)
	if err != nil {
		return out, err
	}
	query, err := historyPageQuery(in)
	if err != nil {
		return out, err
	}
	err = c.call(ctx, "GET", path+query, "", nil, &out)
	return out, err
}

// GetTaskAttempt 获取当前归属及已保存结果，不提供执行秘密或执行授权。
func (c *Client) GetTaskAttempt(ctx context.Context, taskID, attemptID string) (Attempt, error) {
	var out Attempt
	if !validID(attemptID) {
		return out, errors.New("invalid attempt id")
	}
	path, err := historyResourcePath(taskID)
	if err != nil {
		return out, err
	}
	err = c.call(ctx, "GET", path+"/"+attemptID, "", nil, &out)
	return out, err
}

// ListAttemptEvidence 列出原先仅保存为证据的报告，不把声明结果提升为权威结果。
func (c *Client) ListAttemptEvidence(ctx context.Context, taskID, attemptID string, in HistoryPageRequest) (AttemptEvidencePage, error) {
	var out AttemptEvidencePage
	path, err := historyResourcePath(taskID, attemptID)
	if err != nil {
		return out, err
	}
	query, err := historyPageQuery(in)
	if err != nil {
		return out, err
	}
	err = c.call(ctx, "GET", path+query, "", nil, &out)
	return out, err
}

// GetAttemptEvidence 读取单条原报告正文，不改变任务或尝试的权威状态。
func (c *Client) GetAttemptEvidence(ctx context.Context, taskID, attemptID, evidenceID string) (AttemptEvidence, error) {
	var out AttemptEvidence
	path, err := historyResourcePath(taskID, attemptID, evidenceID)
	if err != nil {
		return out, err
	}
	err = c.call(ctx, "GET", path, "", nil, &out)
	return out, err
}