mesh-delivery/modules/mesh-delivery-checker/internal/check/line.go

package check

import (
	"fmt"
	"strings"
	"unicode/utf8"

	"git.novox.be/novox/mesh-sdk/go/delivery"
)

// MaxLine is the most characters a status's line has: the forge shows a status's description in a short space, and the full
// report is linked (ADR 0447 clause 3, ADR 0484 clause 7). A line that would be longer drops its lesser parts in a fixed
// order, and is cut last.
const MaxLine = 140

// seconds is a time in milliseconds in the unit a person reads: 350ms, 4.1s, 72s.
func seconds(ms int64) string {
	switch {
	case ms < 1000:
		return fmt.Sprintf("%dms", ms)
	case ms < 10000:
		return fmt.Sprintf("%.1fs", float64(ms)/1000)
	}
	return fmt.Sprintf("%ds", (ms+500)/1000)
}

func short12(s string) string {
	if len(s) > 12 {
		return s[:12]
	}
	return s
}

// firstFailed is what failed first, in words: a conflict, a refused step or a test, named before anything else.
func firstFailed(v delivery.Verdict) string {
	f := v.Failed
	switch {
	case f.Test != "":
		if f.Words != "" {
			return f.Test + ": " + f.Words
		}
		return f.Test
	case f.Machine != "" && f.Words != "":
		return f.Machine + ": " + f.Words
	case f.Machine != "":
		return f.Machine
	}
	return f.Words
}

// pieces are the parts of a line, from the most to the least needed.
type pieces struct {
	head, commits, counts, shortCounts, times, shortTimes, over, builds, composition, group string
}

func (p pieces) join(drop int) string {
	parts := []string{p.head, p.commits, p.counts}
	switch {
	case drop < 3 && p.times != "":
		parts = append(parts, p.times)
	case drop == 3 && p.shortTimes != "":
		parts = []string{p.head, p.commits, p.shortCounts, p.shortTimes}
	}
	if p.over != "" {
		parts = append(parts, p.over)
	}
	if drop < 1 && p.builds != "" {
		parts = append(parts, p.builds)
	}
	if drop < 2 && p.group != "" {
		parts = append(parts, p.group)
	}
	if p.composition != "" {
		parts = append(parts, p.composition)
	}
	out := make([]string, 0, len(parts))
	for _, s := range parts {
		if s != "" {
			out = append(out, s)
		}
	}
	return strings.Join(out, " | ")
}

func levelWords(name string, r delivery.LevelResult) string {
	s := fmt.Sprintf("%s %d run, %d kept", name, r.Run, r.Kept)
	if r.Skipped > 0 {
		s += fmt.Sprintf(", %d skipped", r.Skipped)
	}
	return s
}

func compositionWords(c *delivery.Composition) string {
	switch {
	case c == nil, c.State == delivery.CompositionNotRun:
		return "composition not yet run"
	case c.State == delivery.CompositionPass:
		return "composition passed with " + short12(c.SDK)
	}
	return "composition failed: " + c.Words
}

func buildWords(builds []BuildNote) string {
	if len(builds) == 0 {
		return ""
	}
	parts := make([]string, len(builds))
	for i, b := range builds {
		parts[i] = b.Module + " " + b.State
	}
	return "builds: " + strings.Join(parts, ", ")
}

// parts makes the pieces of the line of a pull request of a case.
func parts(v delivery.Verdict, cs *Case, p Pull, builds []BuildNote, slowest []string) pieces {
	var pc pieces
	commits := short12(p.Head) + " on " + short12(p.Trunk)
	switch v.State {
	case delivery.VerdictRunning:
		pc.head = "checking " + commits
	case delivery.VerdictPass:
		pc.head = "pass " + commits
	default:
		pc.head = "failed: " + firstFailed(v)
		pc.commits = commits
	}
	var counts []string
	for _, level := range []string{delivery.LevelUnit, delivery.LevelIntegration} {
		if r, ok := v.Levels[level]; ok {
			counts = append(counts, levelWords(level, r))
		}
	}
	pc.counts = strings.Join(counts, " | ")
	var short []string
	for _, level := range []string{delivery.LevelUnit, delivery.LevelIntegration} {
		if r, ok := v.Levels[level]; ok {
			name := map[string]string{delivery.LevelUnit: "unit", delivery.LevelIntegration: "int"}[level]
			w := fmt.Sprintf("%s %d run %d kept", name, r.Run, r.Kept)
			if r.Skipped > 0 {
				w += fmt.Sprintf(" %d skipped", r.Skipped)
			}
			short = append(short, w)
		}
	}
	pc.shortCounts = strings.Join(short, " | ")
	if v.State != delivery.VerdictRunning {
		t := v.Took
		var times []string
		for _, x := range []struct {
			name string
			ms   int64
		}{{"queue", t.Queue}, {"clone", t.Clone}, {"unit", t.Unit}, {"int setup", t.IntegrationSetup}, {"int run", t.IntegrationRun}, {"composition", t.Composition}} {
			if x.ms > 0 {
				times = append(times, x.name+" "+seconds(x.ms))
			}
		}
		if len(times) > 0 {
			pc.times = strings.Join(times, ", ")
		}
		// The compact form for a line that is too long: the parts that dominate, the integration level's setup and run as one.
		short = short[:0:0]
		if t.Clone > 0 {
			short = append(short, "clone "+seconds(t.Clone))
		}
		if t.Unit > 0 {
			short = append(short, "unit "+seconds(t.Unit))
		}
		switch {
		case t.IntegrationSetup > 0 && t.IntegrationRun > 0:
			short = append(short, "int "+seconds(t.IntegrationSetup)+"+"+seconds(t.IntegrationRun))
		case t.IntegrationRun > 0:
			short = append(short, "int "+seconds(t.IntegrationRun))
		}
		pc.shortTimes = strings.Join(short, " ")
	}
	if len(v.OverBound) > 0 {
		pc.over = "over bound: " + strings.Join(v.OverBound, ", ")
		if len(slowest) > 0 {
			pc.over += " (slowest " + strings.Join(slowest, ", ") + ")"
		}
	}
	pc.builds = buildWords(builds)
	if v.State != delivery.VerdictRunning {
		pc.composition = compositionWords(v.Composition)
	}
	if cs != nil && len(cs.Pulls) > 1 {
		pc.group = fmt.Sprintf("group %s of %d pull requests", cs.Group, len(cs.Pulls))
		if v.State != delivery.VerdictPass {
			pc.group = fmt.Sprintf("%s#%d in group %s", p.Repository, p.Number, cs.Group)
		}
	}
	return pc
}

// Report is the full line of a pull request's status, with no limit: what the read tools and the full report say.
func Report(v delivery.Verdict, cs *Case, p Pull, builds []BuildNote, slowest []string) string {
	return parts(v, cs, p, builds, slowest).join(0)
}

// Line is the words of a status for one pull request of a case (ADR 0447 clause 3, ADR 0484 clause 7): the verdict first (a
// failure names the conflict, the refused step or the test before anything), the head and the trunk commit as twelve
// characters each, the tests run, kept and skipped per level, the time of each part, a level over its bound with its slowest
// tests, the builds of the touched modules, and that the composition was not yet run. It is at most MaxLine characters: the
// builds, then the group drop first, then the times are given in their compact form, then dropped, and the line is cut at last.
func Line(v delivery.Verdict, cs *Case, p Pull, builds []BuildNote, slowest []string) string {
	pc := parts(v, cs, p, builds, slowest)
	for drop := 0; drop <= 4; drop++ {
		if s := pc.join(drop); utf8.RuneCountInString(s) <= MaxLine {
			return s
		}
	}
	runes := []rune(pc.join(4))
	return string(runes[:MaxLine-1]) + "…"
}