package webhook

import (
	"regexp"
	"strconv"
)

var (
	closesRe = regexp.MustCompile(`(?i)\b(?:closes|fixes|resolves|close|fix|resolve)\s+#(\d+)`)
	branchRe = regexp.MustCompile(`(?:^|[-/])(\d+)(?:[-/]|$)`)
	nonceRe  = regexp.MustCompile(`(?i)<!--\s*spx:nonce=([0-9a-f-]+)\s*-->`)
	reviewRe = regexp.MustCompile(`(?i)<!--\s*spx:review=1\s*-->`)
)

// ResolveIssueNumber resolves the issue number in priority order:
// 1. PR body keyword (Closes/Fixes/Resolves #N)
// 2. Branch name containing a number
// 3. Legacy path number
func ResolveIssueNumber(prBody, branch string, legacyNumber int) (int, bool) {
	if m := closesRe.FindStringSubmatch(prBody); m != nil {
		n, _ := strconv.Atoi(m[1])
		return n, true
	}
	if branch != "" {
		if m := branchRe.FindStringSubmatch(branch); m != nil {
			n, _ := strconv.Atoi(m[1])
			return n, true
		}
	}
	if legacyNumber > 0 {
		return legacyNumber, true
	}
	return 0, false
}

// ShouldAutoReview returns the effective auto-review flag.
// The per-issue stateJSON "autoReview" bool takes precedence over globalAutoReview.
func ShouldAutoReview(stateJSON map[string]any, globalAutoReview bool) bool {
	if v, ok := stateJSON["autoReview"].(bool); ok {
		return v
	}
	return globalAutoReview
}

// ExtractNonce extracts the nonce value from a <!-- spx:nonce=... --> marker.
func ExtractNonce(issueBody string) (string, bool) {
	m := nonceRe.FindStringSubmatch(issueBody)
	if m == nil || m[1] == "" {
		return "", false
	}
	return m[1], true
}

// IsReviewMarker reports whether commentBody contains <!-- spx:review=1 -->.
func IsReviewMarker(commentBody string) bool {
	return reviewRe.MatchString(commentBody)
}