more stuff

server/letters.go

@@ -0,0 +1,107 @@
+package server
+
+import (
+	"bytes"
+	"net/http"
+	"strings"
+
+	"github.com/Theodor-Springmann-Stiftung/lenz-web/xmlmodels"
+	"github.com/labstack/echo/v5"
+)
+
+type dateRange struct {
+	Label   string
+	Start   int
+	End     int
+	Letters []letterHeadModel
+}
+
+type lettersPageModel struct {
+	Ranges        []dateRange
+	SelectedRange string
+	ShowAll       bool
+	ActiveRanges  []dateRange
+}
+
+func (s *Server) Home(c *echo.Context) error {
+	rangeParam := c.Request().URL.Query().Get("range")
+	if rangeParam == "" {
+		rangeParam = "all"
+	}
+	model := buildLettersPageModel(s.app.Library(), rangeParam)
+	var out bytes.Buffer
+	if err := s.tmpl.ExecuteTemplate(&out, "home", model); err != nil {
+		return c.String(http.StatusInternalServerError, "template render failed: "+err.Error())
+	}
+	return c.HTML(http.StatusOK, out.String())
+}
+
+func buildLettersPageModel(lib *xmlmodels.Library, rangeParam string) lettersPageModel {
+	ranges := []dateRange{
+		{Label: "1756-1770", Start: 1756, End: 1770, Letters: []letterHeadModel{}},
+		{Label: "1771-1775", Start: 1771, End: 1775, Letters: []letterHeadModel{}},
+		{Label: "1776", Start: 1776, End: 1776, Letters: []letterHeadModel{}},
+		{Label: "1777-1779", Start: 1777, End: 1779, Letters: []letterHeadModel{}},
+		{Label: "1780-1792", Start: 1780, End: 1792, Letters: []letterHeadModel{}},
+	}
+
+	years, yearMap := lib.Years()
+	for _, year := range years {
+		letters, ok := yearMap[year]
+		if !ok {
+			continue
+		}
+
+		target := -1
+		for i := range ranges {
+			if year >= ranges[i].Start && year <= ranges[i].End {
+				target = i
+				break
+			}
+		}
+		if target == -1 {
+			continue
+		}
+
+		for _, meta := range letters {
+			metaCopy := meta
+			ranges[target].Letters = append(ranges[target].Letters, buildLetterHead(lib, &metaCopy))
+		}
+	}
+
+	selected := strings.TrimSpace(rangeParam)
+	if selected == "" {
+		selected = "all"
+	}
+
+	model := lettersPageModel{
+		Ranges:        ranges,
+		SelectedRange: selected,
+		ShowAll:       selected == "all",
+		ActiveRanges:  make([]dateRange, 0, len(ranges)),
+	}
+	if model.ShowAll {
+		for _, r := range ranges {
+			if len(r.Letters) > 0 {
+				model.ActiveRanges = append(model.ActiveRanges, r)
+			}
+		}
+		return model
+	}
+
+	for _, r := range ranges {
+		if r.Label == selected && len(r.Letters) > 0 {
+			model.ActiveRanges = append(model.ActiveRanges, r)
+			return model
+		}
+	}
+
+	model.ShowAll = true
+	model.SelectedRange = "all"
+	for _, r := range ranges {
+		if len(r.Letters) > 0 {
+			model.ActiveRanges = append(model.ActiveRanges, r)
+		}
+	}
+	return model
+}