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controllers/piece_controller.go

@@ -0,0 +1,141 @@
+package controllers
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers/logging"
+	"github.com/Theodor-Springmann-Stiftung/kgpz_web/viewmodels"
+	"github.com/Theodor-Springmann-Stiftung/kgpz_web/xmlmodels"
+	"github.com/gofiber/fiber/v2"
+)
+
+func GetPiece(kgpz *xmlmodels.Library) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		id := c.Params("id")
+		if id == "" {
+			logging.Error(nil, "Piece ID is missing")
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		// Parse the generated ID format: YYYY-NNN-PPP
+		var piece *xmlmodels.Piece
+		if strings.Contains(id, "-") {
+			parts := strings.Split(id, "-")
+			if len(parts) == 3 {
+				year, yearErr := strconv.Atoi(parts[0])
+				issueNum, issueErr := strconv.Atoi(parts[1])
+				page, pageErr := strconv.Atoi(parts[2])
+
+				if yearErr == nil && issueErr == nil && pageErr == nil {
+					piece = findPieceByYearIssuePage(kgpz, year, issueNum, page)
+				}
+			}
+		}
+
+		// Fallback to original ID lookup if generated ID doesn't work
+		if piece == nil {
+			piece = kgpz.Pieces.Item(id)
+		}
+
+		if piece == nil {
+			logging.Error(nil, "Piece could not be found with ID: "+id)
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		pieceView, err := viewmodels.NewPieceView(*piece, kgpz)
+		if err != nil {
+			logging.Error(err, "Piece view could not be created")
+			return c.SendStatus(fiber.StatusInternalServerError)
+		}
+
+		return c.Render("/piece/", fiber.Map{"model": pieceView, "pieceId": id}, "fullwidth")
+	}
+}
+
+// GetPieceWithPage handles piece URLs with optional page parameter: /beitrag/:id/:page?
+func GetPieceWithPage(kgpz *xmlmodels.Library) fiber.Handler {
+	return func(c *fiber.Ctx) error {
+		id := c.Params("id")
+		if id == "" {
+			logging.Error(nil, "Piece ID is missing")
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		// Handle optional page parameter
+		pageParam := c.Params("page")
+		var targetPage int
+		if pageParam != "" {
+			pi, err := strconv.Atoi(pageParam)
+			if err != nil || pi < 1 {
+				logging.Error(err, "Page is not a valid number")
+				return c.SendStatus(fiber.StatusNotFound)
+			}
+			targetPage = pi
+		}
+
+		// Parse the generated ID format: YYYY-NNN-PPP
+		var piece *xmlmodels.Piece
+		if strings.Contains(id, "-") {
+			parts := strings.Split(id, "-")
+			if len(parts) == 3 {
+				year, yearErr := strconv.Atoi(parts[0])
+				issueNum, issueErr := strconv.Atoi(parts[1])
+				page, pageErr := strconv.Atoi(parts[2])
+
+				if yearErr == nil && issueErr == nil && pageErr == nil {
+					piece = findPieceByYearIssuePage(kgpz, year, issueNum, page)
+				}
+			}
+		}
+
+		// Fallback to original ID lookup if generated ID doesn't work
+		if piece == nil {
+			piece = kgpz.Pieces.Item(id)
+		}
+
+		if piece == nil {
+			logging.Error(nil, "Piece could not be found with ID: "+id)
+			return c.SendStatus(fiber.StatusNotFound)
+		}
+
+		pieceView, err := viewmodels.NewPieceView(*piece, kgpz)
+		if err != nil {
+			logging.Error(err, "Piece view could not be created")
+			return c.SendStatus(fiber.StatusInternalServerError)
+		}
+
+		// If a page was specified, validate it exists in this piece
+		if targetPage > 0 {
+			pageExists := false
+			for _, pageEntry := range pieceView.AllPages {
+				if pageEntry.PageNumber == targetPage {
+					pageExists = true
+					break
+				}
+			}
+			if !pageExists {
+				logging.Debug(fmt.Sprintf("Page %d not found in piece %s", targetPage, id))
+				return c.SendStatus(fiber.StatusNotFound)
+			}
+		}
+
+		return c.Render("/piece/", fiber.Map{"model": pieceView, "pieceId": id, "targetPage": targetPage}, "fullwidth")
+	}
+}
+
+// findPieceByYearIssuePage finds a piece that starts on the given year, issue, and page
+func findPieceByYearIssuePage(kgpz *xmlmodels.Library, year, issueNum, page int) *xmlmodels.Piece {
+	kgpz.Pieces.Lock()
+	defer kgpz.Pieces.Unlock()
+
+	for _, piece := range kgpz.Pieces.Array {
+		for _, issueRef := range piece.IssueRefs {
+			if issueRef.When.Year == year && issueRef.Nr == issueNum && issueRef.Von == page {
+				return &piece
+			}
+		}
+	}
+	return nil
+}