package git

import (
	"log/slog"
	"net/http"

	"git.gabrielgio.me/cerrado/pkg/service"
	"git.gabrielgio.me/cerrado/templates"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/go-git/go-git/v5/plumbing/object"
	"github.com/gorilla/mux"
)

type (
	GitHandler struct {
		gitService gitService
	}

	gitService interface {
		ListRepositories() ([]*service.Repository, error)
		ListCommits(name string, ref string) ([]*object.Commit, error)
		GetHead(name string) (*plumbing.Reference, error)
		ListTags(name string) ([]*object.Tag, error)
		ListBranches(name string) ([]*plumbing.Reference, error)
	}
)

func NewGitHandler(gitService gitService) *GitHandler {
	return &GitHandler{
		gitService: gitService,
	}
}

func (g *GitHandler) List(w http.ResponseWriter, _ *http.Request) {
	repos, err := g.gitService.ListRepositories()
	if err != nil {
		slog.Error("Error listing repo", "error", err)
		return
	}

	gitList := &templates.GitListPage{repos}
	templates.WritePageTemplate(w, gitList)
}

func (g *GitHandler) Summary(w http.ResponseWriter, r *http.Request) {
	name := mux.Vars(r)["name"]
	ref, err := g.gitService.GetHead(name)
	if err != nil {
		slog.Error("Error loading head", "error", err)
		return
	}

	gitList := &templates.GitItemPage{
		Name:        name,
		Ref:         ref.Name().Short(),
		GitItemBase: &templates.GitItemSummaryPage{},
	}
	templates.WritePageTemplate(w, gitList)
}

func (g *GitHandler) About(w http.ResponseWriter, r *http.Request) {
	name := mux.Vars(r)["name"]
	ref, err := g.gitService.GetHead(name)
	if err != nil {
		slog.Error("Error loading head", "error", err)
		return
	}
	gitList := &templates.GitItemPage{
		Name:        name,
		Ref:         ref.Name().Short(),
		GitItemBase: &templates.GitItemAboutPage{},
	}
	templates.WritePageTemplate(w, gitList)
}

func (g *GitHandler) Refs(w http.ResponseWriter, r *http.Request) {
	name := mux.Vars(r)["name"]

	tags, err := g.gitService.ListTags(name)
	if err != nil {
		slog.Error("Error loading tags", "error", err)
		return
	}

	branches, err := g.gitService.ListBranches(name)
	if err != nil {
		slog.Error("Error loading branches", "error", err)
		return
	}

	ref, err := g.gitService.GetHead(name)
	if err != nil {
		slog.Error("Error loading head", "error", err)
		return
	}

	gitList := &templates.GitItemPage{
		Name: name,
		Ref:  ref.Name().Short(),
		GitItemBase: &templates.GitItemRefsPage{
			Tags:     tags,
			Branches: branches,
		},
	}
	templates.WritePageTemplate(w, gitList)
}

func (g *GitHandler) Tree(w http.ResponseWriter, r *http.Request) {
	name := mux.Vars(r)["name"]
	ref := mux.Vars(r)["ref"]
	gitList := &templates.GitItemPage{
		Name:        name,
		Ref:         ref,
		GitItemBase: &templates.GitItemTreePage{},
	}
	templates.WritePageTemplate(w, gitList)
}

func (g *GitHandler) Log(w http.ResponseWriter, r *http.Request) {
	name := mux.Vars(r)["name"]
	ref := mux.Vars(r)["ref"]

	commits, err := g.gitService.ListCommits(name, ref)
	if err != nil {
		slog.Error("Error loading commits", "error", err)
		return
	}

	gitList := &templates.GitItemPage{
		Name: name,
		Ref:  ref,
		GitItemBase: &templates.GitItemLogPage{
			Commits: commits,
		},
	}
	templates.WritePageTemplate(w, gitList)
}