feat: update, delete, get movies

projects/greenlight/cmd/api/movies.go

@@ -1,9 +1,9 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
-	"time"
 
 	"greenlight.debuggingjon.dev/internal/data"
 	"greenlight.debuggingjon.dev/internal/validator"
@@ -68,24 +68,119 @@ func (app *application) createMovieHandler(w http.ResponseWriter, r *http.Reques
 func (app *application) showMovieHandler(w http.ResponseWriter, r *http.Request) {
 	id, err := app.readIDParam(r)
 	if err != nil {
-		// Use the new notFoundResponse() helper.
 		app.notFoundResponse(w, r)
 		return
 	}
 
-	movie := data.Movie{
-		ID:        id,
-		CreatedAt: time.Now(),
-		Title:     "Casablanca",
-		Runtime:   102,
-		Genres:    []string{"drama", "romance", "war"}, Version: 1,
+	// Call the Get() method to fetch the data for a specific movie. We also need to
+	// use the errors.Is() function to check if it returns a data.ErrRecordNotFound
+	// error, in which case we send a 404 Not Found response to the client.
+	movie, err := app.models.Movies.Get(id)
+	if err != nil {
+		switch {
+		case errors.Is(err, data.ErrRecordNotFound):
+			app.notFoundResponse(w, r)
+		default:
+			app.serverErrorResponse(w, r, err)
+		}
+		return
 	}
 
-	// Create an envelope{"movie": movie} instance and pass it to writeJSON(), instead
-	// of passing the plain movie struct.
 	err = app.writeJSON(w, http.StatusOK, envelope{"movie": movie}, nil)
 	if err != nil {
-		// Use the new serverErrorResponse() helper.
+		app.serverErrorResponse(w, r, err)
+	}
+}
+
+func (app *application) updateMovieHandler(w http.ResponseWriter, r *http.Request) {
+	// Extract the movie ID from the URL.
+	id, err := app.readIDParam(r)
+	if err != nil {
+		app.notFoundResponse(w, r)
+		return
+	}
+
+	// Fetch the existing movie record from the database, sending a 404 Not Found
+	// response to the client if we couldn't find a matching record.
+	movie, err := app.models.Movies.Get(id)
+	if err != nil {
+		switch {
+		case errors.Is(err, data.ErrRecordNotFound):
+			app.notFoundResponse(w, r)
+		default:
+			app.serverErrorResponse(w, r, err)
+		}
+		return
+	}
+	// Declare an input struct to hold the expected data from the client.
+	var input struct {
+		Title   string       `json:"title"`
+		Year    int32        `json:"year"`
+		Runtime data.Runtime `json:"runtime"`
+		Genres  []string     `json:"genres"`
+	}
+
+	// Read the JSON request body data into the input struct.
+	err = app.readJSON(w, r, &input)
+	if err != nil {
+		app.badRequestResponse(w, r, err)
+		return
+	}
+
+	// Copy the values from the request body to the appropriate fields of the movie
+	// record.
+	movie.Title = input.Title
+	movie.Year = input.Year
+	movie.Runtime = input.Runtime
+	movie.Genres = input.Genres
+
+	// Validate the updated movie record, sending the client a 422 Unprocessable Entity
+	// response if any checks fail.
+	v := validator.New()
+
+	if data.ValidateMovie(v, movie); !v.Valid() {
+		app.failedValidationResponse(w, r, v.Errors)
+		return
+	}
+
+	// Pass the updated movie record to our new Update() method.
+	err = app.models.Movies.Update(movie)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+		return
+	}
+
+	// Write the updated movie record in a JSON response.
+	err = app.writeJSON(w, http.StatusOK, envelope{"movie": movie}, nil)
+	if err != nil {
+		app.serverErrorResponse(w, r, err)
+	}
+}
+
+func (app *application) deleteMovieHandler(w http.ResponseWriter, r *http.Request) {
+	// Extract the movie ID from the URL.
+	id, err := app.readIDParam(r)
+	if err != nil {
+		app.notFoundResponse(w, r)
+		return
+	}
+
+	// Delete the movie from the database, sending a 404 Not Found response to the
+	// client if there isn't a matching record.
+	err = app.models.Movies.Delete(id)
+	if err != nil {
+		switch {
+		case errors.Is(err, data.ErrRecordNotFound):
+			app.notFoundResponse(w, r)
+		default:
+			app.serverErrorResponse(w, r, err)
+		}
+		return
+	}
+
+	// Return a 200 OK status code along with a success message.
+	err = app.writeJSON(w, http.StatusOK, envelope{"message": "movie successfully deleted"}, nil)
+	if err != nil {
 		app.serverErrorResponse(w, r, err)
 	}
 }