package main

import (
	"fmt"
	"log"
	"net/http"
	"strconv"
	"time"

	"github.com/gin-gonic/gin"
)

func declareAPIAuthRepositoriesRoutes(router *gin.RouterGroup) {
	router.GET("/repositories", func(c *gin.Context) {
		var u *User
		if user, ok := c.Get("user"); ok {
			u = user.(*User)
		} else {
			u = c.MustGet("LoggedUser").(*User)
		}

		repositories, err := u.GetRepositories()
		if err != nil {
			log.Println("Unable to GetRepositories:", err)
			c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": "Unable to retrieve your repositories. Please try again in a few moment."})
			return
		}

		c.JSON(http.StatusOK, repositories)
	})
	router.POST("/repositories", func(c *gin.Context) {
		var u *User
		if user, ok := c.Get("user"); ok {
			u = user.(*User)
		} else {
			u = c.MustGet("LoggedUser").(*User)
		}

		var repository Repository
		if err := c.ShouldBindJSON(&repository); err != nil {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"errmsg": err.Error()})
			return
		}

		w := c.MustGet("work").(*Work)
		k, err := u.NewRepository(w, repository.URI)
		if err != nil {
			log.Println("Unable to NewRepository:", err)
			c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": "Unable to register your public repository. Please try again in a few moment."})
			return
		}

		c.JSON(http.StatusOK, k)
	})

	repositoriesRoutes := router.Group("/repositories/:rid")
	repositoriesRoutes.Use(repositoryHandler)

	repositoriesRoutes.GET("", func(c *gin.Context) {
		repo := c.MustGet("repository").(*Repository)

		c.JSON(http.StatusOK, repo)
	})
	repositoriesRoutes.PUT("", func(c *gin.Context) {
		current := c.MustGet("repository").(*Repository)

		var new Repository
		if err := c.ShouldBindJSON(&new); err != nil {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"errmsg": err.Error()})
			return
		}

		new.Id = current.Id

		u := c.MustGet("LoggedUser").(*User)
		if new.IdUser != current.IdUser && !u.IsAdmin {
			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"errmsg": "Operation not allowed."})
			return
		}

		if repository, err := new.Update(); err != nil {
			log.Println("Unable to Update repository:", err)
			c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": fmt.Sprintf("An error occurs during repository updation: %s", err.Error())})
			return
		} else {
			c.JSON(http.StatusOK, repository)
		}
	})
	repositoriesRoutes.DELETE("", func(c *gin.Context) {
		repository := c.MustGet("repository").(*Repository)

		if _, err := repository.Delete(); err != nil {
			log.Println("Unable to Delete repository:", err)
			c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": fmt.Sprintf("An error occurs during repository deletion: %s", err.Error())})
			return
		} else {
			c.JSON(http.StatusOK, nil)
		}
	})
}

func repositoryHandler(c *gin.Context) {
	var u *User
	if user, ok := c.Get("user"); ok {
		u = user.(*User)
	} else {
		u = c.MustGet("LoggedUser").(*User)
	}

	if rid, err := strconv.Atoi(string(c.Param("rid"))); err != nil {
		c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"errmsg": "Bad repository identifier."})
		return
	} else if u.IsAdmin {
		if repository, err := getRepository(rid); err != nil {
			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"errmsg": "Repository not found."})
			return
		} else {
			c.Set("repository", repository)
			c.Next()
		}
	} else if repository, err := u.getRepository(rid); err != nil {
		c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"errmsg": "Repository not found."})
		return
	} else {
		c.Set("repository", repository)
		c.Next()
	}
}

type Repository struct {
	Id        int64      `json:"id"`
	IdUser    int64      `json:"id_user"`
	IdWork    int64      `json:"id_work"`
	URI       string     `json:"uri"`
	LastCheck *time.Time `json:"last_check"`
}

func (u *User) GetRepositories() (repositories []*Repository, err error) {
	if rows, errr := DBQuery("SELECT id_repository, id_user, id_work, uri, last_check FROM user_work_repositories WHERE id_user=?", u.Id); errr != nil {
		return nil, errr
	} else {
		defer rows.Close()

		for rows.Next() {
			var repo Repository
			if err = rows.Scan(&repo.Id, &repo.IdUser, &repo.IdWork, &repo.URI, &repo.LastCheck); err != nil {
				return
			}
			repositories = append(repositories, &repo)
		}
		if err = rows.Err(); err != nil {
			return
		}

		return
	}
}

func getRepository(id int) (r *Repository, err error) {
	r = new(Repository)
	err = DBQueryRow("SELECT id_repository, id_user, id_work, uri, lastcheck FROM user_work_repositories WHERE id_repository=?", id).Scan(&r.Id, &r.IdUser, &r.IdWork, &r.URI, &r.LastCheck)
	return
}

func (u *User) getRepository(id int) (r *Repository, err error) {
	r = new(Repository)
	err = DBQueryRow("SELECT id_repository, id_user, id_work, uri FROM user_work_repositories WHERE id_repository=? AND id_user=?", id, u.Id).Scan(&r.Id, &r.IdUser, &r.IdWork, &r.URI, &r.LastCheck)
	return
}

func (u *User) NewRepository(w *Work, uri string) (*Repository, error) {
	if res, err := DBExec("INSERT INTO user_work_repositories (id_user, id_work, uri) VALUES (?, ?, ?)", u.Id, w.Id, uri); err != nil {
		return nil, err
	} else if rid, err := res.LastInsertId(); err != nil {
		return nil, err
	} else {
		return &Repository{rid, u.Id, w.Id, uri, nil}, nil
	}
}

func (r *Repository) Update() (*Repository, error) {
	if _, err := DBExec("UPDATE user_work_repositories SET id_user = ?, id_work = ?, uri = ?, last_check = ? WHERE id_repository = ?", r.IdUser, r.IdWork, r.URI, r.LastCheck, r.Id); err != nil {
		return nil, err
	} else {
		return r, err
	}
}

func (r Repository) Delete() (int64, error) {
	if res, err := DBExec("DELETE FROM user_work_repositories WHERE id_repository = ?", r.Id); err != nil {
		return 0, err
	} else if nb, err := res.RowsAffected(); err != nil {
		return 0, err
	} else {
		return nb, err
	}
}

func ClearRepositories() (int64, error) {
	if res, err := DBExec("DELETE FROM user_work_repositories"); err != nil {
		return 0, err
	} else if nb, err := res.RowsAffected(); err != nil {
		return 0, err
	} else {
		return nb, err
	}
}