// Package parser 发布清单文本解析（规则移植自 opsx-jenkins parser.go）。
package parser

import (
	"fmt"
	"strings"
)

type Job struct {
	Name    string `json:"name"`
	Version string `json:"version"`
}

type Result struct {
	Jobs      []Job  `json:"jobs"`
	ParamName string `json:"param"`
	RefType   string `json:"refType"` // tag | branch
}

var skipHeaders = map[string]bool{
	"jenkins服务": true, "jenkins": true, "服务": true, "发布": true,
	"发布清单": true, "jobs": true, "job": true, "服务列表": true,
}

// Parse 解析多行发布文本。
// refType: "branch" 每行一个应用名（版本由 fixedRef 统一覆盖）；
// "tag" 支持：参数头行、"name version" 内联对（=/:/tab/空格分隔）、名称/版本交替行。
func Parse(text, refType, fixedRef string) (*Result, error) {
	if refType != "branch" {
		refType = "tag"
	}
	lines := splitNonEmptyLines(text)
	if len(lines) == 0 {
		return nil, fmt.Errorf("发布文本为空")
	}

	res := &Result{RefType: refType}
	if refType == "branch" {
		if fixedRef == "" {
			fixedRef = "test"
		}
		for _, l := range lines {
			name := l
			if fields := strings.Fields(l); len(fields) >= 2 {
				name = fields[0]
			}
			res.Jobs = append(res.Jobs, Job{Name: name, Version: fixedRef})
		}
		if err := validate(res.Jobs); err != nil {
			return nil, err
		}
		return res, nil
	}

	// tag 模式
	var tokens []string
	for _, l := range lines {
		norm := strings.ToLower(strings.ReplaceAll(strings.TrimRight(l, ":"), " ", ""))
		if skipHeaders[norm] {
			continue
		}
		if res.ParamName == "" && isParamHeader(l) {
			res.ParamName = l
			continue
		}
		if name, ver, ok := splitInlinePair(l); ok {
			res.Jobs = append(res.Jobs, Job{Name: name, Version: ver})
			continue
		}
		tokens = append(tokens, l)
	}
	if len(tokens)%2 != 0 {
		last := tokens[len(tokens)-1]
		return nil, fmt.Errorf("发布文本无法成对解析，剩余孤立行: %s", last)
	}
	for i := 0; i < len(tokens); i += 2 {
		res.Jobs = append(res.Jobs, Job{Name: tokens[i], Version: tokens[i+1]})
	}
	if res.ParamName == "" {
		res.ParamName = "TAG"
	}
	if err := validate(res.Jobs); err != nil {
		return nil, err
	}
	return res, nil
}

func splitNonEmptyLines(text string) []string {
	text = strings.ReplaceAll(strings.ReplaceAll(text, "\r\n", "\n"), "\r", "\n")
	var out []string
	for _, l := range strings.Split(text, "\n") {
		l = strings.TrimSpace(l)
		if l == "" || strings.HasPrefix(l, "#") {
			continue
		}
		out = append(out, l)
	}
	return out
}

// isParamHeader 识别参数头行：TAG/BRANCH/VERSION/SELECT 等显式词，或全大写+下划线的 Jenkins 参数名
func isParamHeader(line string) bool {
	explicit := map[string]bool{
		"tag": true, "branch": true, "version": true, "select": true,
		"git_tag": true, "image_tag": true, "git_branch": true, "ref": true,
	}
	norm := strings.ToLower(strings.TrimSpace(strings.TrimRight(line, ":")))
	if explicit[norm] {
		return true
	}
	if len(line) <= 24 && len(line) >= 2 && !strings.ContainsAny(line, "/-. ") {
		for _, r := range line {
			if r != '_' && (r < 'A' || r > 'Z') {
				return false
			}
		}
		return true
	}
	return false
}

// splitInlinePair "name ver" / "name=ver" / "name:ver" / tab 分隔
func splitInlinePair(line string) (string, string, bool) {
	for _, sep := range []string{"=", ":"} {
		if idx := strings.Index(line, sep); idx > 0 {
			name := strings.TrimSpace(line[:idx])
			ver := strings.TrimSpace(line[idx+len(sep):])
			if name != "" && ver != "" && looksLikeName(name) && looksLikeVersion(ver) {
				return name, ver, true
			}
		}
	}
	fields := strings.FieldsFunc(line, func(r rune) bool { return r == ' ' || r == '\t' })
	if len(fields) == 2 && looksLikeName(fields[0]) && looksLikeVersion(fields[1]) {
		return fields[0], fields[1], true
	}
	return "", "", false
}

func looksLikeName(s string) bool {
	return len(s) >= 2 && !looksLikeVersion(s)
}

// looksLikeVersion v 前缀含数字，或含数字且连字符少于 2 个
func looksLikeVersion(s string) bool {
	rest := strings.TrimPrefix(strings.ToLower(s), "v")
	if strings.ContainsAny(rest, "0123456789") && strings.Count(rest, "-") < 2 {
		return true
	}
	return false
}

func validate(jobs []Job) error {
	if len(jobs) == 0 {
		return fmt.Errorf("未解析到任何应用")
	}
	seen := map[string]int{}
	for i, j := range jobs {
		if j.Name == "" || j.Version == "" {
			return fmt.Errorf("第 %d 项名称或版本为空", i+1)
		}
		if prev, ok := seen[j.Name]; ok {
			return fmt.Errorf("应用 %s 重复出现（第 %d 与第 %d 项）", j.Name, prev+1, i+1)
		}
		seen[j.Name] = i
	}
	return nil
}