// Copyright 2017-2025 WIT.COM Inc. All rights reserved.
// Use of this source code is governed by the GPL 3.0

package main

import (
	"os"
	"path/filepath"
	"sync"

	"go.wit.com/lib/gadgets"
	"go.wit.com/lib/protobuf/forgepb"
	"go.wit.com/lib/protobuf/gitpb"
	"go.wit.com/log"

	"go.wit.com/gui"
)

type patchWindow struct {
	once  sync.Once            // only init() the window once
	win   *gadgets.BasicWindow // the patches window
	stack *gui.Node            // the top box set as vertical
	shelf *gui.Node            // the first box in the stack, set as horizontal
	grid  *gui.Node            // the list of available patches
	// summary *patchSummary        // summary of current patches
	setgrid *gui.Node         // the list of each patchset
	pset    *forgepb.Patchset // the patchset in question
}

// todo: autogenerate these or make them standared 'gui' package functions
// make this an go interface somehow

// is the window hidden right now?
func (w *patchWindow) Hidden() bool {
	return w.win.Hidden()
}

// switches between the window being visable or hidden on the desktop
func (w *patchWindow) Toggle() {
	if w.Hidden() {
		w.Show()
	} else {
		w.Hide()
	}
}

// hides the window completely
func (w *patchWindow) Show() {
	w.win.Show()
}

func (w *patchWindow) Hide() {
	w.win.Hide()
}

// should be the first box/widget in the window
// greys out the window to the user
func (w *patchWindow) Disable() {
	w.stack.Disable()
}

func (w *patchWindow) Enable() {
	w.stack.Enable()
}

// you can only have one of these
func makePatchWindow(pset *forgepb.Patchset) *patchWindow {
	pw := new(patchWindow)

	// sync.Once()
	pw.win = gadgets.RawBasicWindow("Patcheset for " + pset.Name + " (" + pset.Comment + ")")
	pw.win.Make()

	pw.stack = pw.win.Box().NewBox("bw vbox", false)
	// me.reposwin.Draw()
	pw.win.Custom = func() {
		// sets the hidden flag to false so Toggle() works
		pw.win.Hide()
	}

	grid := pw.stack.NewGrid("", 0, 0)

	grid.NewLabel("Patchset Details:")
	grid.NewLabel(pset.GitAuthorName)
	grid.NewLabel(pset.GitAuthorEmail)
	grid.NewLabel("start branch: " + pset.StartBranchName)
	grid.NewLabel(pset.StartBranchHash)
	grid.NewLabel("end branch: " + pset.EndBranchName)
	grid.NewLabel(pset.EndBranchHash)
	grid.NextRow()

	g := pw.stack.NewGroup("PatchSet List")

	// make a grid to put the list of git repos that have patches
	// in this particular patchset
	grid = g.NewGrid("", 0, 0)
	grid.NewLabel("repo")
	grid.NewLabel("patch name")
	grid.NewLabel("Applied in current branch?")
	grid.NewLabel("start hash")
	grid.NewLabel("")
	/*
		grid.NewButton("Extract", func() {
			if err := savePatchset(pset); err != nil {
				log.Info("Save err:", err)
				return
			}
		})
			grid.NewButton("Apply with git am", func() {
				if _, _, _, err := IsEverythingOnUser(); err != nil {
					log.Info("You can only apply patches to the user branch")
					return
				}
				if IsAnythingDirty() {
					log.Info("You can't apply patches when repos are dirty")
					me.forge.PrintHumanTable(me.found)
					return
				}
				if argv.Force {
					applyPatchset(pset)
				}
			})
	*/
	grid.NextRow()

	// add the patches to the grid
	pw.addPatchset(grid, pset)
	return pw
}

func (r *patchWindow) addPatchset(grid *gui.Node, pset *forgepb.Patchset) {
	/*
		repomap := make(map[*gitpb.Repo][]*forgepb.Patch)
		repohash := make(map[*gitpb.Repo]string)

		// sort patches by repo namespace
		all := pset.Patches.SortByFilename()
		for all.Scan() {
			p := all.Next()
			s := p.RepoNamespace
			repo := me.forge.FindByGoPath(s)
			if repo == nil {
				log.Info("Could not figure out repo path", s)
				continue
			}
			repomap[repo] = append(repomap[repo], p)
			repohash[repo] = p.StartHash
		}
	*/

	all := pset.Patches.SortByFilename()
	for all.Scan() {
		p := all.Next()
		// for repo, patches := range repomap {
		rn := p.RepoNamespace
		repo := me.forge.FindByGoPath(rn)
		if repo == nil {
			log.Info("Could not figure out repo path", rn)
			rn += " bad repo"
		}
		log.Info("Adding patches for", rn)
		grid.NewLabel(rn)

		/*
			for i, p := range patches {
				log.Info(i, p.Filename)
				grid.NewLabel(p.Comment)
				grid.NewLabel("in current branch?")
				break
			}
		*/
		// hash := repohash[repo]
		grid.NewLabel(p.StartHash)
		grid.NewLabel(p.Filename)

		if repo == nil {
			continue
		}
		// var win *repoPatchWindow
		grid.NewButton("apply", func() {
			filename, _ := savePatch(p)
			if err := applyPatch(repo, filename); err != nil {
				log.Info("warn user of git am error", err)
			}
			// win = makeRepoPatchWindow(repo, p)
			// win.Show()
		})
		grid.NewCheckbox("").SetChecked(true)
		grid.NewCheckbox("").SetChecked(true)
		grid.NewButton("save patch to /tmp", func() {
			savePatch(p)
			// for _, pat := range patches {
			// }
		})
		/*
			grid.NewButton("view hash", func() {
				cmd := []string{"git", "whatchanged", hash}
				log.Info(repo.GetFullPath(), cmd)
			})
			grid.NewButton("git am", func() {
				cmd := []string{"git", "whatchanged", hash}
				log.Info(repo.GetFullPath(), cmd)
			})
		*/
		grid.NextRow()
	}
}

func applyPatch(repo *gitpb.Repo, filename string) error {
	cmd := []string{"git", "am", filename}
	_, err := repo.RunVerbose(cmd)
	return err
}

func savePatch(p *forgepb.Patch) (string, error) {
	_, filen := filepath.Split(p.Filename)
	tmpname := filepath.Join("/tmp", filen)
	log.Info("saving as", tmpname, p.Filename)
	raw, err := os.OpenFile(tmpname, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		return "", err
	}
	raw.Write(p.Data)
	raw.Close()

	return tmpname, nil
}

// saves the patches in ~/.config/forge/currentpatches/
func savePatchset(pset *forgepb.Patchset) error {
	log.Info("savePatches() NAME", pset.Name)
	log.Info("savePatches() COMMENT", pset.Comment)
	log.Info("savePatches() GIT_AUTHOR_NAME", pset.GetGitAuthorName())
	log.Info("savePatches() GIT_AUTHOR_EMAIL", pset.GetGitAuthorEmail())
	log.Info("savePatches() Branch Name", pset.GetStartBranchName())
	log.Info("savePatches() Start Hash", pset.GetStartBranchHash())

	var count int
	var bad int
	var lasterr error
	all := pset.Patches.SortByFilename()
	for all.Scan() {
		p := all.Next()
		basedir := filepath.Join(os.Getenv("FORGE_CONFIG"), "currentpatches")
		if fullname, err := savePatchFile(p, basedir); err != nil {
			log.Info(fullname, "save failed", err)
			bad += 1
			lasterr = err
		}
		count += 1
	}
	log.Info("pset has", count, "total patches, ", bad, "bad save patches")
	if bad == 0 {
		return lasterr
	}
	return nil
}