package main

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

type Build struct {
	Actions []Action    `json:"actions"`
	Number  interface{} `json:"number"`
	URL     string      `json:"url"`
}

type Action struct {
	Class      string      `json:"_class"`
	Parameters []Parameter `json:"parameters,omitempty"`
}

type Parameter struct {
	Name  string      `json:"name"`
	Value interface{} `json:"value"`
}

var client = &http.Client{
	Timeout: 10 * time.Second,
}

func FetchBuild(cfg *Config, job string) (*Build, error) {
	buildID := cfg.Jenkins.Number
	api := fmt.Sprintf("%s://%s/job/%s/%s/api/json",
		cfg.Jenkins.Schema,
		cfg.Jenkins.URL,
		job,
		buildID,
	)

	req, err := http.NewRequest("GET", api, nil)
	if err != nil {
		log.Printf("failed to create GET request %s: %v", job, err)
		return nil, err
	}
	req.SetBasicAuth(cfg.Jenkins.User, cfg.Jenkins.Token)

	resp, err := client.Do(req)
	if err != nil {
		log.Printf("failed to fetch build %s: %v", job, err)
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		log.Printf("failed to fetch build %s: %s", job, resp.Status)
		return nil, fmt.Errorf("failed to fetch build: %s", resp.Status)
	}

	// io限制，1m
	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))

	var build Build
	if err := json.Unmarshal(body, &build); err != nil {
		log.Printf("failed to unmarshal build %s: %v", job, err)
		return nil, err
	}

	return &build, nil
}

func GenerateBuildURL(cfg *Config, build *Build) string {
	values := url.Values{}

	for _, action := range build.Actions {
		if action.Class == "hudson.model.ParametersAction" {
			for _, param := range action.Parameters {
				values.Set(param.Name, fmt.Sprintf("%v", param.Value))
			}
		}
	}

	for _, param := range cfg.Jenkins.DefaultParameters {
		for k, v := range param {
			values.Set(k, fmt.Sprintf("%v", v))
		}
	}

	u, err := url.Parse(build.URL)
	if err != nil {
		log.Fatalf("failed to parse build URL: %v", err)
	}

	parts := strings.Split(strings.TrimSuffix(u.Path, "/"), "/")
	if len(parts) > 0 {
		u.Path = path.Join(parts[:len(parts)-1]...) + "/buildWithParameters"
	}

	u.RawQuery = values.Encode()
	return u.String()
}

func TriggerBuild(cfg *Config, build *Build) error {
	url := GenerateBuildURL(cfg, build)

	req, err := http.NewRequest("POST", url, nil)
	if err != nil {
		log.Printf("failed to create POST request: %v", err)
		return err
	}
	req.SetBasicAuth(cfg.Jenkins.User, cfg.Jenkins.Token)

	resp, err := client.Do(req)
	if err != nil {
		log.Printf("failed to trigger build %s: %v", url, err)
		return err
	}
	defer resp.Body.Close()

	log.Printf("triggered build %s: %s", url, resp.Status)
	return nil
}