cv-site/internal/handlers/cv.go

package handlers

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"os/exec"
	"strings"
	"time"

	"github.com/juanatsap/cv-site/internal/models"
	"github.com/juanatsap/cv-site/internal/pdf"
	"github.com/juanatsap/cv-site/internal/templates"
)

// CVHandler handles CV-related requests
type CVHandler struct {
	templates    *templates.Manager
	pdfGenerator *pdf.Generator
	serverAddr   string
}

// NewCVHandler creates a new CV handler
func NewCVHandler(tmpl *templates.Manager, serverAddr string) *CVHandler {
	return &CVHandler{
		templates:    tmpl,
		pdfGenerator: pdf.NewGenerator(30 * time.Second),
		serverAddr:   serverAddr,
	}
}

// Home renders the full CV page
func (h *CVHandler) Home(w http.ResponseWriter, r *http.Request) {
	// Get language from query parameter, default to English
	lang := r.URL.Query().Get("lang")
	if lang == "" {
		lang = "en"
	}

	// Validate language
	if lang != "en" && lang != "es" {
		HandleError(w, r, BadRequestError("Unsupported language. Use 'en' or 'es'"))
		return
	}

	// Load CV data
	cv, err := models.LoadCV(lang)
	if err != nil {
		HandleError(w, r, DataLoadError(err, "CV"))
		return
	}

	// Calculate duration for each experience
	for i := range cv.Experience {
		cv.Experience[i].Duration = calculateDuration(
			cv.Experience[i].StartDate,
			cv.Experience[i].EndDate,
			cv.Experience[i].Current,
			lang,
		)
	}

	// Process projects for dynamic dates
	for i := range cv.Projects {
		processProjectDates(&cv.Projects[i], lang)
	}

	// Split skills between left and right sidebars
	skillsLeft, skillsRight := splitSkills(cv.Skills.Technical)

	// Calculate years of experience
	yearsOfExperience := calculateYearsOfExperience()

	// Get current year
	currentYear := time.Now().Year()

	// Prepare template data
	data := map[string]interface{}{
		"CV":                 cv,
		"Lang":               lang,
		"SkillsLeft":         skillsLeft,
		"SkillsRight":        skillsRight,
		"YearsOfExperience":  yearsOfExperience,
		"CurrentYear":        currentYear,
	}

	// Render template
	tmpl, err := h.templates.Render("index.html")
	if err != nil {
		HandleError(w, r, TemplateError(err, "index.html"))
		return
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := tmpl.Execute(w, data); err != nil {
		HandleError(w, r, TemplateError(err, "index.html"))
		return
	}
}

// CVContent renders just the CV content for HTMX swaps
func (h *CVHandler) CVContent(w http.ResponseWriter, r *http.Request) {
	// Get language from query parameter
	lang := r.URL.Query().Get("lang")
	if lang == "" {
		lang = "en"
	}

	// Validate language
	if lang != "en" && lang != "es" {
		HandleError(w, r, BadRequestError("Unsupported language. Use 'en' or 'es'"))
		return
	}

	// Load CV data
	cv, err := models.LoadCV(lang)
	if err != nil {
		HandleError(w, r, DataLoadError(err, "CV"))
		return
	}

	// Calculate duration for each experience
	for i := range cv.Experience {
		cv.Experience[i].Duration = calculateDuration(
			cv.Experience[i].StartDate,
			cv.Experience[i].EndDate,
			cv.Experience[i].Current,
			lang,
		)
	}

	// Process projects for dynamic dates
	for i := range cv.Projects {
		processProjectDates(&cv.Projects[i], lang)
	}

	// Split skills between left and right sidebars
	skillsLeft, skillsRight := splitSkills(cv.Skills.Technical)

	// Calculate years of experience
	yearsOfExperience := calculateYearsOfExperience()

	// Get current year
	currentYear := time.Now().Year()

	// Prepare template data
	data := map[string]interface{}{
		"CV":                 cv,
		"Lang":               lang,
		"SkillsLeft":         skillsLeft,
		"SkillsRight":        skillsRight,
		"YearsOfExperience":  yearsOfExperience,
		"CurrentYear":        currentYear,
	}

	// Render template
	tmpl, err := h.templates.Render("cv-content.html")
	if err != nil {
		HandleError(w, r, TemplateError(err, "cv-content.html"))
		return
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := tmpl.Execute(w, data); err != nil {
		HandleError(w, r, TemplateError(err, "cv-content.html"))
		return
	}
}

// ExportPDF handles PDF export requests using chromedp
func (h *CVHandler) ExportPDF(w http.ResponseWriter, r *http.Request) {
	// Get language from query parameter
	lang := r.URL.Query().Get("lang")
	if lang == "" {
		lang = "en"
	}

	// Validate language
	if lang != "en" && lang != "es" {
		HandleError(w, r, BadRequestError("Unsupported language. Use 'en' or 'es'"))
		return
	}

	// Construct URL to generate PDF from
	// Use localhost instead of the actual server address to avoid network overhead
	url := fmt.Sprintf("http://%s/?lang=%s", h.serverAddr, lang)

	log.Printf("Generating PDF from URL: %s", url)

	// Generate PDF
	pdfData, err := h.pdfGenerator.GenerateFromURL(r.Context(), url)
	if err != nil {
		log.Printf("PDF generation failed: %v", err)
		HandleError(w, r, InternalError(err))
		return
	}

	// Set response headers
	filename := fmt.Sprintf("CV-Juan-Andres-Moreno-Rubio-%s.pdf", lang)
	w.Header().Set("Content-Type", "application/pdf")
	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%s", filename))
	w.Header().Set("Content-Length", fmt.Sprintf("%d", len(pdfData)))

	// Write PDF data
	if _, err := w.Write(pdfData); err != nil {
		log.Printf("Failed to write PDF response: %v", err)
		return
	}

	log.Printf("Successfully generated PDF: %s (%d bytes)", filename, len(pdfData))
}

// splitSkills splits skill categories between left (page 1) and right (page 2) sidebars
// Each category explicitly specifies which sidebar it belongs to via the "sidebar" field
func splitSkills(skills []models.SkillCategory) (left, right []models.SkillCategory) {
	if len(skills) == 0 {
		return nil, nil
	}

	// Filter by sidebar field
	for _, skill := range skills {
		if skill.Sidebar == "right" {
			right = append(right, skill)
		} else {
			// Default to left if not specified or if set to "left"
			left = append(left, skill)
		}
	}

	return left, right
}

// calculateYearsOfExperience calculates years of experience since April 1, 2005
// This matches the original React implementation that calculated from 01/04/2005
func calculateYearsOfExperience() int {
	// First day at work: April 1, 2005
	firstDay := time.Date(2005, time.April, 1, 9, 0, 0, 0, time.UTC)

	// Current date
	now := time.Now()

	// Calculate the difference in years
	years := now.Year() - firstDay.Year()

	// Adjust if we haven't reached the anniversary this year yet
	if now.Month() < firstDay.Month() ||
	   (now.Month() == firstDay.Month() && now.Day() < firstDay.Day()) {
		years--
	}

	return years
}

// calculateDuration calculates the duration between two dates in years and months
// Date format expected: "YYYY-MM" (e.g., "2021-01")
// Returns a formatted string like "3 years 6 months" or "6 months"
func calculateDuration(startDate, endDate string, current bool, lang string) string {
	// Parse start date
	start, err := time.Parse("2006-01", startDate)
	if err != nil {
		return ""
	}

	// Determine end date
	var end time.Time
	if current {
		end = time.Now()
	} else {
		end, err = time.Parse("2006-01", endDate)
		if err != nil {
			return ""
		}
	}

	// Calculate total months
	totalMonths := (end.Year()-start.Year())*12 + int(end.Month()-start.Month())

	// If end date is before start date, return empty
	if totalMonths < 0 {
		return ""
	}

	years := totalMonths / 12
	months := totalMonths % 12

	// Format the duration string based on language
	var result string
	if lang == "es" {
		if years > 0 && months > 0 {
			yearStr := "años"
			if years == 1 {
				yearStr = "año"
			}
			monthStr := "meses"
			if months == 1 {
				monthStr = "mes"
			}
			result = fmt.Sprintf("(%d %s %d %s)", years, yearStr, months, monthStr)
		} else if years > 0 {
			yearStr := "años"
			if years == 1 {
				yearStr = "año"
			}
			result = fmt.Sprintf("(%d %s)", years, yearStr)
		} else {
			monthStr := "meses"
			if months == 1 {
				monthStr = "mes"
			}
			result = fmt.Sprintf("(%d %s)", months, monthStr)
		}
	} else {
		if years > 0 && months > 0 {
			yearStr := "years"
			if years == 1 {
				yearStr = "year"
			}
			monthStr := "months"
			if months == 1 {
				monthStr = "month"
			}
			result = fmt.Sprintf("(%d %s %d %s)", years, yearStr, months, monthStr)
		} else if years > 0 {
			yearStr := "years"
			if years == 1 {
				yearStr = "year"
			}
			result = fmt.Sprintf("(%d %s)", years, yearStr)
		} else {
			monthStr := "months"
			if months == 1 {
				monthStr = "month"
			}
			result = fmt.Sprintf("(%d %s)", months, monthStr)
		}
	}

	return result
}

// processProjectDates calculates dynamic dates for projects
// If a project has a gitRepoUrl, it fetches the first commit date
// For current projects, it sets the current system date
func processProjectDates(project *models.Project, lang string) {
	now := time.Now()

	// Set dynamic current date for ongoing projects
	if project.Current {
		if lang == "es" {
			project.DynamicDate = "Presente"
		} else {
			project.DynamicDate = "Present"
		}
	}

	// If project has a git repository URL, fetch the first commit date
	if project.GitRepoUrl != "" {
		commitDate := getGitRepoFirstCommitDate(project.GitRepoUrl)
		if commitDate != "" {
			project.ComputedStartDate = commitDate
		}
	}

	// If no computed date and no static date, use current date for current projects
	if project.ComputedStartDate == "" && project.StartDate == "" && project.Current {
		project.ComputedStartDate = now.Format("2006-01")
	}

	// If we have a computed date but no static date, use the computed one
	if project.ComputedStartDate != "" && project.StartDate == "" {
		project.StartDate = project.ComputedStartDate
	}
}

// getGitRepoFirstCommitDate fetches the first commit date from a git repository
// Supports local git repository paths
func getGitRepoFirstCommitDate(repoPath string) string {
	// Check if the path exists and is a directory
	info, err := os.Stat(repoPath)
	if err != nil || !info.IsDir() {
		return ""
	}

	// Execute git command to get the first commit date
	// Format: YYYY-MM (to match StartDate format)
	cmd := exec.Command("git", "-C", repoPath, "log", "--reverse", "--format=%ci", "--date=format:%Y-%m")
	cmd.Dir = repoPath

	output, err := cmd.Output()
	if err != nil {
		return ""
	}

	// Parse the output to get the first commit date
	lines := strings.Split(strings.TrimSpace(string(output)), "\n")
	if len(lines) == 0 {
		return ""
	}

	// Extract YYYY-MM from the first commit timestamp
	// Format of output: "2024-06-15 10:30:45 +0200"
	firstLine := lines[0]
	parts := strings.Fields(firstLine)
	if len(parts) > 0 {
		datePart := parts[0] // "2024-06-15"
		dateParts := strings.Split(datePart, "-")
		if len(dateParts) >= 2 {
			return dateParts[0] + "-" + dateParts[1] // "2024-06"
		}
	}

	return ""
}