package postgres

import (
	"context"
	"database/sql"
	"github.com/Masterminds/squirrel"
	"github.com/gissleh/stufflog/internal/slerrors"
	"github.com/gissleh/stufflog/models"
	"github.com/jmoiron/sqlx"
	"github.com/lib/pq"
	"time"
)

type projectRepository struct {
	db *sqlx.DB
}

func (r *projectRepository) Find(ctx context.Context, id string) (*models.Project, error) {
	res := projectDBO{}
	err := r.db.GetContext(ctx, &res, "SELECT * FROM project WHERE project_id=$1", id)
	if err != nil {
		if err == sql.ErrNoRows {
			return nil, slerrors.NotFound("Project")
		}

		return nil, err
	}

	return res.ToProject(), nil
}

func (r *projectRepository) List(ctx context.Context, filter models.ProjectFilter) ([]*models.Project, error) {
	sq := squirrel.Select("*").From("project").PlaceholderFormat(squirrel.Dollar)
	sq = sq.Where(squirrel.Eq{"user_id": filter.UserID})
	if filter.IDs != nil {
		sq = sq.Where(squirrel.Eq{"project_id": filter.IDs})
	}
	if filter.Active != nil {
		if filter.IncludeSemiActive {
			sq = sq.Where(squirrel.Or{
				squirrel.Eq{"active": *filter.Active},
				squirrel.Eq{"status_tag": []string{
					"to do", "background", "on hold", "progress",
				}},
			})
		} else {
			sq = sq.Where(squirrel.Eq{"active": *filter.Active})
		}

	}
	if filter.Expiring {
		sq = sq.Where("end_time IS NOT NULL")
	}
	if filter.Favorite != nil {
		sq = sq.Where(squirrel.Eq{"favorite": *filter.Favorite})
	}
	if filter.Ungrouped == true {
		sq = sq.Where("project_group_id is NULL")
	} else if filter.ProjectGroupIDs != nil {
		sq = sq.Where(squirrel.Eq{"project_group_id": filter.ProjectGroupIDs})
	}

	sq = sq.OrderBy("active", "created_time DESC")

	query, args, err := sq.ToSql()
	if err != nil {
		return nil, err
	}

	res := make([]*projectDBO, 0, 8)
	err = r.db.SelectContext(ctx, &res, query, args...)
	if err != nil {
		if err == sql.ErrNoRows {
			return []*models.Project{}, nil
		}
		return nil, err
	}

	res2 := make([]*models.Project, len(res))
	for i, v := range res {
		res2[i] = v.ToProject()
	}

	return res2, nil
}

func (r *projectRepository) Insert(ctx context.Context, project models.Project) error {
	if project.Tags == nil {
		project.Tags = []string{}
	}

	_, err := r.db.NamedExecContext(ctx, `
		INSERT INTO project(
			project_id, user_id, project_group_id, name, description, icon, active, created_time, start_time, end_time, subtract_amount, status_tag, favorite, tags, task_sort_fields
		) VALUES (
			:project_id, :user_id, :project_group_id, :name, :description, :icon, :active, :created_time, :start_time, :end_time, :subtract_amount, :status_tag, :favorite, :tags, :task_sort_fields
		)
	`, toProjectDBO(project))
	if err != nil {
		return err
	}

	return nil
}

func (r *projectRepository) Update(ctx context.Context, project models.Project) error {
	if project.Tags == nil {
		project.Tags = []string{}
	}

	_, err := r.db.NamedExecContext(ctx, `
		UPDATE project SET
			name = :name,
			description = :description,
			project_group_id = :project_group_id,
			icon = :icon,
			active = :active,
		    start_time = :start_time,
			end_time = :end_time,
			subtract_amount = :subtract_amount,
		    status_tag = :status_tag,
		    favorite = :favorite,
			tags = :tags,
			task_sort_fields = :task_sort_fields
		WHERE project_id=:project_id
	`, toProjectDBO(project))
	if err != nil {
		return err
	}

	return nil
}

func (r *projectRepository) Delete(ctx context.Context, project models.Project) error {
	_, err := r.db.ExecContext(ctx, `DELETE FROM project WHERE project_id=$1`, project.ID)
	if err != nil {
		if err == sql.ErrNoRows {
			return slerrors.NotFound("Project")
		}
		return err
	}

	_, err = r.db.ExecContext(ctx, `DELETE FROM task_link WHERE project_id=$1`, project.ID)
	if err != nil && err != sql.ErrNoRows {
		return err
	}

	return nil
}

type projectDBO struct {
	ID             string         `json:"id" db:"project_id"`
	UserID         string         `json:"-" db:"user_id"`
	ProjectGroupID *string        `json:"projectGroupID" db:"project_group_id"`
	Name           string         `json:"name" db:"name"`
	Description    string         `json:"description" db:"description"`
	Icon           string         `json:"icon" db:"icon"`
	Active         bool           `json:"active" db:"active"`
	CreatedTime    time.Time      `json:"createdTime" db:"created_time"`
	StartTime      *time.Time     `json:"startTime" db:"start_time"`
	EndTime        *time.Time     `json:"endTime" db:"end_time"`
	SubtractAmount int            `json:"subtractAmount" db:"subtract_amount"`
	StatusTag      *string        `json:"statusTag" db:"status_tag"`
	Favorite       bool           `json:"favorite" db:"favorite"`
	Tags           pq.StringArray `json:"tags" db:"tags"`
	TaskSortFields pq.StringArray `json:"taskSortFields" db:"task_sort_fields"`
}

func toProjectDBO(project models.Project) *projectDBO {
	return &projectDBO{
		ID:             project.ID,
		UserID:         project.UserID,
		ProjectGroupID: project.GroupID,
		Name:           project.Name,
		Description:    project.Description,
		Icon:           project.Icon,
		Active:         project.Active,
		CreatedTime:    project.CreatedTime,
		StartTime:      project.StartTime,
		EndTime:        project.EndTime,
		SubtractAmount: project.SubtractAmount,
		StatusTag:      project.StatusTag,
		Favorite:       project.Favorite,
		Tags:           project.Tags,
		TaskSortFields: project.TaskSortFields,
	}
}

func (d *projectDBO) ToProject() *models.Project {
	return &models.Project{
		ID:             d.ID,
		UserID:         d.UserID,
		GroupID:        d.ProjectGroupID,
		Name:           d.Name,
		Description:    d.Description,
		Icon:           d.Icon,
		Active:         d.Active,
		CreatedTime:    d.CreatedTime,
		StartTime:      d.StartTime,
		EndTime:        d.EndTime,
		SubtractAmount: d.SubtractAmount,
		StatusTag:      d.StatusTag,
		Favorite:       d.Favorite,
		Tags:           d.Tags,
		TaskSortFields: d.TaskSortFields,
	}
}