// This file is part of arduino-cli.
//
// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
//
// This software is released under the GNU General Public License version 3,
// which covers the main part of arduino-cli.
// The terms of this license can be found at:
// https://www.gnu.org/licenses/gpl-3.0.en.html
//
// You can be released from the requirements of the above licenses by purchasing
// a commercial license. Buying such a license is mandatory if you want to
// modify or otherwise use the software for commercial activities involving the
// Arduino software without disclosing the source code of your own applications.
// To purchase a commercial license, send an email to license@arduino.cc.

package sketch

import (
	"crypto/md5"
	"encoding/hex"
	"errors"
	"fmt"
	"sort"
	"strings"

	"github.com/arduino/arduino-cli/commands/cmderrors"
	f "github.com/arduino/arduino-cli/internal/algorithms"
	"github.com/arduino/arduino-cli/internal/arduino/globals"
	"github.com/arduino/arduino-cli/internal/i18n"
	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
	"github.com/arduino/go-paths-helper"
)

// Sketch holds all the files composing a sketch
type Sketch struct {
	Name             string
	MainFile         *paths.Path
	FullPath         *paths.Path    // FullPath is the path to the Sketch folder
	OtherSketchFiles paths.PathList // Sketch files that end in .ino other than main file
	AdditionalFiles  paths.PathList
	RootFolderFiles  paths.PathList // All files that are in the Sketch root
	Project          *Project
}

// New creates an Sketch instance by reading all the files composing a sketch and grouping them
// by file type.
func New(path *paths.Path) (*Sketch, error) {
	if path == nil {
		return nil, errors.New(i18n.Tr("sketch path is not valid"))
	}

	path = path.Canonical()
	if exist, err := path.ExistCheck(); err != nil {
		return nil, fmt.Errorf("%s: %w", i18n.Tr("sketch path is not valid"), err)
	} else if !exist {
		return nil, fmt.Errorf("%s: %s", i18n.Tr("no such file or directory"), path)
	}
	if globals.MainFileValidExtensions[path.Ext()] && !path.IsDir() {
		path = path.Parent()
	}

	var mainFile *paths.Path
	for ext := range globals.MainFileValidExtensions {
		candidateSketchMainFile := path.Join(path.Base() + ext)
		if candidateSketchMainFile.Exist() {
			if mainFile == nil {
				mainFile = candidateSketchMainFile
			} else {
				return nil, errors.New(i18n.Tr("multiple main sketch files found (%[1]v, %[2]v)",
					mainFile,
					candidateSketchMainFile,
				))
			}
		}
	}
	if mainFile == nil {
		return nil, errors.New(i18n.Tr("main file missing from sketch: %s", path.Join(path.Base()+globals.MainFileValidExtension)))
	}

	sketch := &Sketch{
		Name:             path.Base(),
		MainFile:         mainFile,
		FullPath:         path,
		OtherSketchFiles: paths.PathList{},
		AdditionalFiles:  paths.PathList{},
		RootFolderFiles:  paths.PathList{},
		Project:          &Project{},
	}

	if projectFile := sketch.GetProjectPath(); projectFile.Exist() {
		prj, err := LoadProjectFile(projectFile)
		if err != nil {
			return nil, fmt.Errorf("%s %w", i18n.Tr("error loading sketch project file:"), err)
		}
		sketch.Project = prj
	}

	err := sketch.checkSketchCasing()
	if e, ok := err.(*InvalidSketchFolderNameError); ok {
		return nil, e
	}
	if err != nil {
		return nil, err
	}

	sketchFolderFiles, err := sketch.supportedFiles()
	if err != nil {
		return nil, fmt.Errorf("%s: %w", i18n.Tr("reading sketch files"), err)
	}

	// Collect files
	for _, p := range sketchFolderFiles {
		ext := p.Ext()
		if globals.MainFileValidExtensions[ext] {
			if p.EqualsTo(mainFile) {
				// The main file must not be included in the lists of other files
				continue
			}
			// file is a valid sketch file, see if it's stored at the
			// sketch root and ignore if it's not.
			if p.Parent().EqualsTo(path) {
				sketch.OtherSketchFiles.Add(p)
				sketch.RootFolderFiles.Add(p)
			}
		} else if globals.AdditionalFileValidExtensions[ext] {
			// If the user exported the compiles binaries to the Sketch "build" folder
			// they would be picked up but we don't want them, so we skip them like so
			if ok, _ := p.IsInsideDir(sketch.FullPath.Join("build")); ok {
				continue
			}

			sketch.AdditionalFiles.Add(p)
			if p.Parent().EqualsTo(path) {
				sketch.RootFolderFiles.Add(p)
			}
		} else {
			return nil, errors.New(i18n.Tr("unknown sketch file extension '%s'", ext))
		}
	}

	sort.Sort(&sketch.AdditionalFiles)
	sort.Sort(&sketch.OtherSketchFiles)
	sort.Sort(&sketch.RootFolderFiles)

	return sketch, nil
}

// supportedFiles reads all files recursively contained in Sketch and
// filter out unneded or unsupported ones and returns them
func (s *Sketch) supportedFiles() (paths.PathList, error) {
	filterValidExtensions := func(p *paths.Path) bool {
		return globals.MainFileValidExtensions[p.Ext()] || globals.AdditionalFileValidExtensions[p.Ext()]
	}

	filterOutBuildPaths := func(p *paths.Path) bool {
		return !p.Join("build.options.json").Exist()
	}

	files, err := s.FullPath.ReadDirRecursiveFiltered(
		filterOutBuildPaths,
		paths.AndFilter(
			paths.FilterOutPrefixes("."),
			filterValidExtensions,
			paths.FilterOutDirectories(),
		),
	)
	if err != nil {
		return nil, err
	}
	return files, nil
}

// GetProfile returns the requested profile or an error if not found
func (s *Sketch) GetProfile(profileName string) (*Profile, error) {
	for _, p := range s.Project.Profiles {
		if p.Name == profileName {
			return p, nil
		}
	}
	return nil, &cmderrors.UnknownProfileError{Profile: profileName}
}

// checkSketchCasing returns an error if the casing of the sketch folder and the main file are different.
// Correct:
//
//	MySketch/MySketch.ino
//
// Wrong:
//
//	MySketch/mysketch.ino
//	mysketch/MySketch.ino
//
// This is mostly necessary to avoid errors on Mac OS X.
// For more info see: https://github.com/arduino/arduino-cli/issues/1174
func (s *Sketch) checkSketchCasing() error {
	files, err := s.FullPath.ReadDir()
	if err != nil {
		return fmt.Errorf("%s: %w", i18n.Tr("reading files"), err)
	}
	files.FilterOutDirs()

	candidateFileNames := []string{}
	for ext := range globals.MainFileValidExtensions {
		candidateFileNames = append(candidateFileNames, fmt.Sprintf("%s%s", s.Name, ext))
	}
	files.FilterPrefix(candidateFileNames...)

	if files.Len() == 0 {
		sketchFile := s.FullPath.Join(s.Name + globals.MainFileValidExtension)
		return &InvalidSketchFolderNameError{
			SketchFolder: s.FullPath,
			SketchFile:   sketchFile,
		}
	}

	return nil
}

// GetProjectPath returns the path to the sketch project file (sketch.yaml or sketch.yml)
func (s *Sketch) GetProjectPath() *paths.Path {
	projectFile := s.FullPath.Join("sketch.yaml")
	if !projectFile.Exist() {
		alternateProjectFile := s.FullPath.Join("sketch.yml")
		if alternateProjectFile.Exist() {
			return alternateProjectFile
		}
	}
	return projectFile
}

// GetDefaultFQBN returns the default FQBN for the sketch (from the sketch.yaml project file), or the
// empty string if not set.
func (s *Sketch) GetDefaultFQBN() string {
	return s.Project.DefaultFqbn
}

// GetDefaultPortAddressAndProtocol returns the default port address and port protocol for the sketch
// (from the sketch.yaml project file), or empty strings if not set.
func (s *Sketch) GetDefaultPortAddressAndProtocol() (string, string) {
	return s.Project.DefaultPort, s.Project.DefaultProtocol
}

// GetDefaultProgrammer return the default Programmer for the sketch (from the sketch.yaml project file),
// ore the empty string if not set.
func (s *Sketch) GetDefaultProgrammer() string {
	return s.Project.DefaultProgrammer
}

// SetDefaultFQBN sets the default FQBN for the sketch and saves it in the sketch.yaml project file.
func (s *Sketch) SetDefaultFQBN(fqbn string) error {
	s.Project.DefaultFqbn = fqbn
	return updateOrAddYamlRootEntry(s.GetProjectPath(), "default_fqbn", fqbn)
}

// SetDefaultPort sets the default port address and port protocol for the sketch and saves it in the
// sketch.yaml project file.
func (s *Sketch) SetDefaultPort(address, protocol string) error {
	s.Project.DefaultPort = address
	s.Project.DefaultProtocol = protocol
	if err := updateOrAddYamlRootEntry(s.GetProjectPath(), "default_port", address); err != nil {
		return err
	}
	return updateOrAddYamlRootEntry(s.GetProjectPath(), "default_protocol", protocol)
}

// SetDefaultFQBN sets the default programmer for the sketch and saves it in the sketch.yaml project file.
func (s *Sketch) SetDefaultProgrammer(programmer string) error {
	s.Project.DefaultProgrammer = programmer
	return updateOrAddYamlRootEntry(s.GetProjectPath(), "default_programmer", programmer)
}

// InvalidSketchFolderNameError is returned when the sketch directory doesn't match the sketch name
type InvalidSketchFolderNameError struct {
	SketchFolder *paths.Path
	SketchFile   *paths.Path
}

func (e *InvalidSketchFolderNameError) Error() string {
	return i18n.Tr("no valid sketch found in %[1]s: missing %[2]s", e.SketchFolder, e.SketchFile)
}

// Hash generate a unique hash for the given sketch.
func (s *Sketch) Hash() string {
	path := s.FullPath.String()
	md5SumBytes := md5.Sum([]byte(path))
	return strings.ToUpper(hex.EncodeToString(md5SumBytes[:]))
}

// ToRpc converts this Sketch into a rpc.LoadSketchResponse
func (s *Sketch) ToRpc() *rpc.Sketch {
	defaultPort, defaultProtocol := s.GetDefaultPortAddressAndProtocol()
	var defaultPortConfig *rpc.MonitorPortConfiguration
	if len(s.Project.DefaultPortConfig) > 0 {
		defaultPortConfig = &rpc.MonitorPortConfiguration{}
		for k, v := range s.Project.DefaultPortConfig {
			defaultPortConfig.Settings = append(defaultPortConfig.Settings, &rpc.MonitorPortSetting{
				SettingId: k,
				Value:     v,
			})
		}
	}
	res := &rpc.Sketch{
		MainFile:          s.MainFile.String(),
		LocationPath:      s.FullPath.String(),
		OtherSketchFiles:  s.OtherSketchFiles.AsStrings(),
		AdditionalFiles:   s.AdditionalFiles.AsStrings(),
		RootFolderFiles:   s.RootFolderFiles.AsStrings(),
		DefaultFqbn:       s.GetDefaultFQBN(),
		DefaultPort:       defaultPort,
		DefaultPortConfig: defaultPortConfig,
		DefaultProtocol:   defaultProtocol,
		DefaultProgrammer: s.GetDefaultProgrammer(),
		Profiles:          f.Map(s.Project.Profiles, (*Profile).ToRpc),
	}
	if defaultProfile, err := s.GetProfile(s.Project.DefaultProfile); err == nil {
		res.DefaultProfile = defaultProfile.ToRpc()
	}
	return res
}
