report.go

package main

import (
	"fmt"
	"strings"
	"time"
)

// Report holds all data for generating reports
type Report struct {
	Stats    Stats
	Streaks  StreakInfo
	Churn    []FileChurn
	Days     int
	RepoName string
}

// GenerateReport creates a comprehensive report
func GenerateReport(stats Stats, streaks StreakInfo, churn []FileChurn, days int) Report {
	return Report{
		Stats:   stats,
		Streaks: streaks,
		Churn:   churn,
		Days:    days,
	}
}

// PrintTerminal prints the report to the terminal
func (r Report) PrintTerminal() {
	printHeader("📋 Comprehensive Report", fmt.Sprintf("Last %d days", r.Days))

	// Section 1: Overview
	fmt.Println(colorize("  ── Overview ──", BrightWhite+Bold))
	fmt.Println()
	printKV("Period", fmt.Sprintf("%s → %s (%d days)",
		r.Stats.FirstCommit.Format("Jan 2"),
		r.Stats.LastCommit.Format("Jan 2, 2006"),
		r.Days))
	printKV("Total Commits", fmt.Sprintf("%d", r.Stats.TotalCommits))
	printKV("Active Days", fmt.Sprintf("%d (%.0f%%)",
		r.Stats.ActiveDays,
		float64(r.Stats.ActiveDays)/float64(r.Days)*100))
	printKV("Lines Changed",
		fmt.Sprintf("%s / %s",
			colorize(fmt.Sprintf("+%d", r.Stats.TotalInsertions), Green),
			colorize(fmt.Sprintf("-%d", r.Stats.TotalDeletions), Red)))
	printKV("Commits/Day", fmt.Sprintf("%.1f", r.Stats.AvgCommitsPerDay))
	fmt.Println()

	// Section 2: Streaks
	fmt.Println(colorize("  ── Streaks ──", BrightWhite+Bold))
	fmt.Println()
	printKV("Current Streak", fmt.Sprintf("%d days 🔥", r.Streaks.CurrentStreak))
	printKV("Longest Streak", fmt.Sprintf("%d days 🏆", r.Streaks.LongestStreak))
	printKV("Activity Rate", fmt.Sprintf("%.1f%%", r.Streaks.ActivityRate))
	fmt.Println()

	// Section 3: Patterns
	fmt.Println(colorize("  ── Patterns ──", BrightWhite+Bold))
	fmt.Println()
	peakHour, hCount := PeakHour(r.Stats.CommitsByHour)
	peakDay, dCount := PeakDay(r.Stats.CommitsByWeekday)
	printKV("Peak Hour", fmt.Sprintf("%02d:00 (%d commits)", peakHour, hCount))
	printKV("Peak Day", fmt.Sprintf("%s (%d commits)", peakDay, dCount))
	if r.Stats.BusiestDay != "" {
		printKV("Busiest Date", fmt.Sprintf("%s (%d commits)", r.Stats.BusiestDay, r.Stats.BusiestDayCount))
	}
	fmt.Println()

	// Section 4: Top contributors
	if len(r.Stats.AuthorCommits) > 1 {
		fmt.Println(colorize("  ── Contributors ──", BrightWhite+Bold))
		fmt.Println()
		authors := TopAuthors(r.Stats.AuthorCommits, 5)
		for i, a := range authors {
			pct := float64(a.Commits) / float64(r.Stats.TotalCommits) * 100
			fmt.Printf("    %d. %-20s %d commits (%.0f%%)\n", i+1, a.Name, a.Commits, pct)
		}
		fmt.Println()
	}

	// Section 5: Hottest files
	if len(r.Churn) > 0 {
		fmt.Println(colorize("  ── Hottest Files ──", BrightWhite+Bold))
		fmt.Println()
		limit := min(10, len(r.Churn))
		for i := 0; i < limit; i++ {
			f := r.Churn[i]
			fmt.Printf("    %2d. %-45s %dx changed\n", i+1, truncate(f.Path, 45), f.Changes)
		}
		fmt.Println()
	}

	printFooter()
}

// ToMarkdown generates a markdown report
func (r Report) ToMarkdown() string {
	var sb strings.Builder

	sb.WriteString("# Git Activity Report\n\n")
	sb.WriteString(fmt.Sprintf("*Generated by gitcap v%s on %s*\n\n",
		version, time.Now().Format("January 2, 2006")))

	// Overview
	sb.WriteString("## 📊 Overview\n\n")
	sb.WriteString(fmt.Sprintf("| Metric | Value |\n"))
	sb.WriteString(fmt.Sprintf("|--------|-------|\n"))
	sb.WriteString(fmt.Sprintf("| Period | %s → %s (%d days) |\n",
		r.Stats.FirstCommit.Format("Jan 2"),
		r.Stats.LastCommit.Format("Jan 2, 2006"),
		r.Days))
	sb.WriteString(fmt.Sprintf("| Total Commits | %d |\n", r.Stats.TotalCommits))
	sb.WriteString(fmt.Sprintf("| Active Days | %d (%.0f%%) |\n",
		r.Stats.ActiveDays,
		float64(r.Stats.ActiveDays)/float64(max(r.Days, 1))*100))
	sb.WriteString(fmt.Sprintf("| Lines Added | +%d |\n", r.Stats.TotalInsertions))
	sb.WriteString(fmt.Sprintf("| Lines Removed | -%d |\n", r.Stats.TotalDeletions))
	sb.WriteString(fmt.Sprintf("| Files Changed | %d |\n", r.Stats.TotalFiles))
	sb.WriteString(fmt.Sprintf("| Avg Commits/Day | %.1f |\n", r.Stats.AvgCommitsPerDay))
	sb.WriteString("\n")

	// Streaks
	sb.WriteString("## 🔥 Streaks\n\n")
	sb.WriteString(fmt.Sprintf("- **Current Streak:** %d days\n", r.Streaks.CurrentStreak))
	sb.WriteString(fmt.Sprintf("- **Longest Streak:** %d days (%s → %s)\n",
		r.Streaks.LongestStreak,
		r.Streaks.LongestStreakStart.Format("Jan 2"),
		r.Streaks.LongestStreakEnd.Format("Jan 2, 2006")))
	sb.WriteString(fmt.Sprintf("- **Activity Rate:** %.1f%%\n", r.Streaks.ActivityRate))
	sb.WriteString("\n")

	// Patterns
	sb.WriteString("## 🕐 Patterns\n\n")
	peakHour, hCount := PeakHour(r.Stats.CommitsByHour)
	peakDay, dCount := PeakDay(r.Stats.CommitsByWeekday)
	sb.WriteString(fmt.Sprintf("- **Peak Hour:** %02d:00 (%d commits)\n", peakHour, hCount))
	sb.WriteString(fmt.Sprintf("- **Peak Day:** %s (%d commits)\n", peakDay, dCount))
	if r.Stats.BusiestDay != "" {
		sb.WriteString(fmt.Sprintf("- **Busiest Date:** %s (%d commits)\n",
			r.Stats.BusiestDay, r.Stats.BusiestDayCount))
	}
	sb.WriteString("\n")

	// Hour distribution
	sb.WriteString("### Commits by Hour\n\n")
	sb.WriteString("```\n")
	maxH := 0
	for _, c := range r.Stats.CommitsByHour {
		if c > maxH {
			maxH = c
		}
	}
	for h := 0; h < 24; h++ {
		barLen := 0
		if maxH > 0 {
			barLen = r.Stats.CommitsByHour[h] * 40 / maxH
		}
		sb.WriteString(fmt.Sprintf("%02d:00 %s %d\n", h,
			strings.Repeat("█", barLen), r.Stats.CommitsByHour[h]))
	}
	sb.WriteString("```\n\n")

	// Day distribution
	sb.WriteString("### Commits by Day\n\n")
	sb.WriteString("```\n")
	dayNames := []string{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}
	maxD := 0
	for _, c := range r.Stats.CommitsByWeekday {
		if c > maxD {
			maxD = c
		}
	}
	for d := 0; d < 7; d++ {
		barLen := 0
		if maxD > 0 {
			barLen = r.Stats.CommitsByWeekday[d] * 40 / maxD
		}
		sb.WriteString(fmt.Sprintf("%s %s %d\n", dayNames[d],
			strings.Repeat("█", barLen), r.Stats.CommitsByWeekday[d]))
	}
	sb.WriteString("```\n\n")

	// Contributors
	if len(r.Stats.AuthorCommits) > 1 {
		sb.WriteString("## 👥 Contributors\n\n")
		sb.WriteString("| Rank | Author | Commits | % |\n")
		sb.WriteString("|------|--------|---------|---|\n")
		authors := TopAuthors(r.Stats.AuthorCommits, 10)
		for i, a := range authors {
			pct := float64(a.Commits) / float64(r.Stats.TotalCommits) * 100
			sb.WriteString(fmt.Sprintf("| %d | %s | %d | %.0f%% |\n",
				i+1, a.Name, a.Commits, pct))
		}
		sb.WriteString("\n")
	}

	// Hottest files
	if len(r.Churn) > 0 {
		sb.WriteString("## 📁 Hottest Files\n\n")
		sb.WriteString("| Rank | File | Changes | +/- |\n")
		sb.WriteString("|------|------|---------|-----|\n")
		limit := min(15, len(r.Churn))
		for i := 0; i < limit; i++ {
			f := r.Churn[i]
			sb.WriteString(fmt.Sprintf("| %d | `%s` | %d | +%d/-%d |\n",
				i+1, f.Path, f.Changes, f.Insertions, f.Deletions))
		}
		sb.WriteString("\n")
	}

	sb.WriteString("---\n")
	sb.WriteString(fmt.Sprintf("*Generated by [gitcap](https://github.com/thinkshake/gitcap) v%s*\n", version))

	return sb.String()
}

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}