// Package jenkins Jenkins REST 客户端（移植自 opsx-jenkins 生产实现）：
// crumb → BasicAuth → buildWithParameters → Location 队列 URL → 队列/构建轮询 → progressiveText 增量控制台。
package jenkins

import (
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"
	"time"
)

type Client struct {
	BaseURL  string
	Username string
	Token    string
	HTTP     *http.Client
}

func NewClient(baseURL, username, token string) *Client {
	return &Client{
		BaseURL:  strings.TrimRight(baseURL, "/"),
		Username: username,
		Token:    token,
		HTTP:     &http.Client{Timeout: 30 * time.Second},
	}
}

// JobInfo Job 概要（folder 已压平为 path/name 形式）
type JobInfo struct {
	Name      string `json:"name"` // 压平路径 folder/job
	URL       string `json:"url"`
	Type      string `json:"type"` // folder | freestyle | pipeline | multibranch
	Status    string `json:"status"` // success | failed | running | unknown
}

func (c *Client) do(method, path string, form url.Values) (*http.Response, error) {
	var body io.Reader
	if form != nil {
		body = strings.NewReader(form.Encode())
	}
	req, err := http.NewRequest(method, c.BaseURL+path, body)
	if err != nil {
		return nil, err
	}
	req.SetBasicAuth(c.Username, c.Token)
	if form != nil {
		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	}
	// CSRF crumb（未启用时 /crumbIssuer 返回 404，跳过）
	if crumb, err := c.crumb(); err == nil {
		req.Header.Set(crumb[0], crumb[1])
	}
	return c.HTTP.Do(req)
}

func (c *Client) crumb() ([2]string, error) {
	req, _ := http.NewRequest("GET", c.BaseURL+"/crumbIssuer/api/json", nil)
	req.SetBasicAuth(c.Username, c.Token)
	resp, err := c.HTTP.Do(req)
	if err != nil {
		return [2]string{}, err
	}
	defer resp.Body.Close()
	if resp.StatusCode == http.StatusNotFound {
		return [2]string{}, errors.New("crumb not enabled")
	}
	var out struct {
		CrumbRequestField string `json:"crumbRequestField"`
		Crumb             string `json:"crumb"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&out); err != nil || out.Crumb == "" {
		return [2]string{}, errors.New("no crumb")
	}
	return [2]string{out.CrumbRequestField, out.Crumb}, nil
}

// Test 连通测试：访问 /api/json
func (c *Client) Test() error {
	resp, err := c.do("GET", "/api/json", nil)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode == http.StatusUnauthorized {
		return errors.New("认证失败：用户名或 Token 错误")
	}
	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("HTTP %d", resp.StatusCode)
	}
	return nil
}

type rawJob struct {
	Name  string   `json:"name"`
	URL   string   `json:"url"`
	Color string   `json:"color"`
	Jobs  []rawJob `json:"jobs"`
}

// colorToStatus Jenkins ball color → 状态
func colorToStatus(color string) string {
	switch {
	case color == "":
		return "unknown"
	case strings.HasSuffix(color, "anime"):
		return "running"
	case strings.HasPrefix(color, "blue"):
		return "success"
	case strings.HasPrefix(color, "red"):
		return "failed"
	case strings.HasPrefix(color, "notbuilt"), strings.HasPrefix(color, "disabled"), strings.HasPrefix(color, "aborted"):
		return "unknown"
	default:
		return "unknown"
	}
}

// ListJobs 递归 3 层拉取 Job 树并压平 folder
func (c *Client) ListJobs() ([]JobInfo, error) {
	resp, err := c.do("GET", "/api/json?tree=jobs[name,url,color,jobs[name,url,color,jobs[name,url,color,jobs[name,url,color]]]]", nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("HTTP %d", resp.StatusCode)
	}
	var root struct {
		Jobs []rawJob `json:"jobs"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&root); err != nil {
		return nil, err
	}
	var flat []JobInfo
	var walk func(jobs []rawJob, prefix string)
	walk = func(jobs []rawJob, prefix string) {
		for _, j := range jobs {
			full := j.Name
			if prefix != "" {
				full = prefix + "/" + j.Name
			}
			if len(j.Jobs) > 0 {
				flat = append(flat, JobInfo{Name: full, URL: j.URL, Type: "folder", Status: "unknown"})
				walk(j.Jobs, full)
			} else {
				flat = append(flat, JobInfo{Name: full, URL: j.URL, Type: "pipeline", Status: colorToStatus(j.Color)})
			}
		}
	}
	walk(root.Jobs, "")
	return flat, nil
}

// jobPathToURL folder/job → /job/folder/job/job/name
func jobPathToURL(jobPath string) string {
	segs := strings.Split(jobPath, "/")
	var b strings.Builder
	for _, s := range segs {
		b.WriteString("/job/")
		b.WriteString(url.PathEscape(s))
	}
	return b.String()
}

// Trigger 触发构建，返回队列 URL（Location 头；拒绝回退 lastBuild 防串号）
func (c *Client) Trigger(jobPath string, params map[string]string) (string, error) {
	path := jobPathToURL(jobPath)
	var form url.Values
	if len(params) > 0 {
		form = url.Values{}
		for k, v := range params {
			form.Set(k, v)
		}
		path += "/buildWithParameters"
	} else {
		path += "/build"
	}
	resp, err := c.do("POST", path, form)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	if resp.StatusCode >= 400 {
		body, _ := io.ReadAll(io.LimitReader(resp.Body, 512))
		return "", fmt.Errorf("触发失败 HTTP %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
	}
	queueURL := resp.Header.Get("Location")
	if queueURL == "" {
		return "", errors.New("未返回队列地址（Location），请检查 Jenkins 版本与权限")
	}
	return queueURL, nil
}

// WaitQueue 等待队列分配为具体构建，返回构建号与构建 URL
func (c *Client) WaitQueue(queueURL string, timeout time.Duration, emit func(string)) (int, string, error) {
	deadline := time.Now().Add(timeout)
	pollClient := &http.Client{Timeout: 15 * time.Second}
	for time.Now().Before(deadline) {
		req, _ := http.NewRequest("GET", queueURL+"api/json", nil)
		req.SetBasicAuth(c.Username, c.Token)
		resp, err := pollClient.Do(req)
		if err == nil {
			var q struct {
				Cancelled  bool `json:"cancelled"`
				Executable *struct {
					Number int    `json:"number"`
					URL    string `json:"url"`
				} `json:"executable"`
				Why string `json:"why"`
			}
			if json.NewDecoder(resp.Body).Decode(&q) == nil {
				resp.Body.Close()
				if q.Cancelled {
					return 0, "", errors.New("构建已被 Jenkins 取消（排队被拒绝）")
				}
				if q.Executable != nil {
					return q.Executable.Number, strings.TrimRight(q.Executable.URL, "/"), nil
				}
				if q.Why != "" {
					emit("排队中: " + q.Why)
				}
			} else {
				resp.Body.Close()
			}
		}
		time.Sleep(2 * time.Second)
	}
	return 0, "", errors.New("等待队列超时")
}

// StreamConsole 增量拉取控制台日志（X-Text-Size/X-More-Data 推进），直到构建结束
func (c *Client) StreamConsole(buildURL string, emit func(string)) {
	offset := 0
	pollClient := &http.Client{Timeout: 15 * time.Second}
	for {
		req, _ := http.NewRequest("GET", fmt.Sprintf("%s/logText/progressiveText?start=%d", buildURL, offset), nil)
		req.SetBasicAuth(c.Username, c.Token)
		resp, err := pollClient.Do(req)
		if err != nil {
			emit("日志拉取失败: " + err.Error())
			return
		}
		body, _ := io.ReadAll(resp.Body)
		resp.Body.Close()
		if len(body) > 0 {
			for _, line := range strings.Split(strings.TrimRight(string(body), "\n"), "\n") {
				if line != "" {
					emit(line)
				}
			}
		}
		if newSize := parseInt(resp.Header.Get("X-Text-Size")); newSize > offset {
			offset = newSize
		}
		if resp.Header.Get("X-More-Data") != "true" {
			return
		}
		time.Sleep(2 * time.Second)
	}
}

// WaitResult 轮询构建结果：SUCCESS/FAILURE/ABORTED/null(进行中)
func (c *Client) WaitResult(buildURL string, timeout time.Duration) (string, error) {
	deadline := time.Now().Add(timeout)
	for time.Now().Before(deadline) {
		req, _ := http.NewRequest("GET", buildURL+"/api/json", nil)
		req.SetBasicAuth(c.Username, c.Token)
		resp, err := c.HTTP.Do(req)
		if err == nil {
			var b struct {
				Building bool    `json:"building"`
				Result   *string `json:"result"`
			}
			if json.NewDecoder(resp.Body).Decode(&b) == nil {
				resp.Body.Close()
				if !b.Building && b.Result != nil {
					return *b.Result, nil
				}
			} else {
				resp.Body.Close()
			}
		}
		time.Sleep(3 * time.Second)
	}
	return "", errors.New("等待构建结果超时")
}

func parseInt(s string) int {
	n := 0
	for _, ch := range s {
		if ch < '0' || ch > '9' {
			return n
		}
		n = n*10 + int(ch-'0')
	}
	return n
}

// MapResult Jenkins 结果 → FlowStack 运行状态
func MapResult(r string) string {
	switch r {
	case "SUCCESS":
		return "success"
	case "ABORTED":
		return "cancelled"
	default:
		return "failed"
	}
}