package mysqldriver

import (
	"context"
	"database/sql"
	"errors"
	"git.aiterp.net/stufflog/server/internal/slerrors"
	"git.aiterp.net/stufflog/server/models"
	sq "github.com/Masterminds/squirrel"
	"github.com/jmoiron/sqlx"
)

type projectRepository struct {
	db *sqlx.DB
}

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

		return nil, err
	}

	return &project, nil
}

func (r *projectRepository) List(ctx context.Context, filter models.ProjectFilter) ([]*models.Project, error) {
	q := sq.Select("project.*").From("project").OrderBy("project_id")
	if len(filter.ProjectIDs) > 0 {
		q = q.Where(sq.Eq{"project_id": filter.ProjectIDs})
	}
	if filter.Search != nil {
		q = q.Where("MATCH (name, description) AGAINST (?)", *filter.Search)
	}
	if filter.Permission != nil && filter.Permission.Valid() {
		q = q.LeftJoin("project_permission ON project.project_id = project_permission.project_id AND project_permission.user_id = ?", filter.Permission.UserID)
		if filter.Permission.MaxLevel >= filter.Permission.MinLevel {
			q = q.Where(sq.And{
				sq.GtOrEq{"project_permission.access_level": filter.Permission.MinLevel},
				sq.LtOrEq{"project_permission.access_level": filter.Permission.MaxLevel},
			})
		} else {
			q = q.Where(sq.GtOrEq{"project_permission.access_level": filter.Permission.MinLevel})
		}
	}

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

	results := make([]*models.Project, 0, 16)
	err = r.db.SelectContext(ctx, &results, query, args...)
	if err != nil {
		if err == sql.ErrNoRows {
			return []*models.Project{}, nil
		}

		return nil, err
	}

	return results, nil
}

func (r *projectRepository) Insert(ctx context.Context, project models.Project) (*models.Project, error) {
	if !project.ValidKey() {
		return nil, errors.New("invalid project id")
	}

	_, err := r.db.NamedExecContext(ctx, `
		INSERT INTO project (project_id, name, description, daily_points) 
		VALUES (:project_id, :name, :description, :daily_points)
	`, project)

	return &project, err
}

func (r *projectRepository) Save(ctx context.Context, project models.Project) error {
	_, err := r.db.NamedExecContext(ctx, `
		UPDATE project
		SET name=:name, description=:description, daily_points=:daily_points
		WHERE project_id=:project_id
	`, project)

	return err
}

func (r *projectRepository) ListPermissions(ctx context.Context, project models.Project) ([]*models.ProjectPermission, error) {
	permissions := make([]*models.ProjectPermission, 0, 4)
	err := r.db.SelectContext(ctx, &permissions, "SELECT * FROM project_permission WHERE project_id=?", project.ID)
	if err != nil {
		return nil, err
	}

	return permissions, nil
}

func (r *projectRepository) GetPermission(ctx context.Context, project models.Project, user models.User) (*models.ProjectPermission, error) {
	permission := models.ProjectPermission{}
	err := r.db.GetContext(ctx, &permission, "SELECT * FROM project_permission WHERE project_id=? AND user_id=?", project.ID, user.ID)
	if err != nil {
		if err == sql.ErrNoRows {
			return &models.ProjectPermission{
				ProjectID: project.ID,
				UserID:    user.ID,
				Level:     models.ProjectPermissionLevelNoAccess,
			}, nil
		}

		return nil, err
	}

	return &permission, nil
}

func (r *projectRepository) GetUserPermissions(ctx context.Context, user models.User, projectIDs []string) ([]*models.ProjectPermission, error) {
	query, args, err := sq.Select("*").From("project_permission").Where(sq.Eq{
		"user_id":    user.ID,
		"project_id": projectIDs,
	}).ToSql()
	if err != nil {
		return nil, err
	}

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

	filled := make(map[string]bool, len(permissions))
	for _, permission := range permissions {
		filled[permission.ProjectID] = true
	}
	for _, projectID := range projectIDs {
		if filled[projectID] {
			continue
		}

		permissions = append(permissions, &models.ProjectPermission{
			ProjectID: projectID,
			UserID:    user.ID,
			Level:     models.ProjectPermissionLevelNoAccess,
		})
	}

	return permissions, nil
}

func (r *projectRepository) GetIssuePermission(ctx context.Context, issue models.Issue, user models.User) (*models.ProjectPermission, error) {
	return r.GetPermission(ctx, models.Project{ID: issue.ProjectID}, user)
}

func (r *projectRepository) SetPermission(ctx context.Context, permission models.ProjectPermission) error {
	_, err := r.db.NamedExecContext(ctx, `
		REPLACE INTO project_permission (project_id, user_id, access_level) 
		VALUES (:project_id, :user_id, :access_level)
	`, permission)

	return err
}

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

	_, err = r.db.ExecContext(ctx, "DELETE FROM project_permission WHERE project_id=?", project.ID)
	if err != nil {
		return err
	}

	_, err = r.db.ExecContext(ctx, "DELETE FROM project_status WHERE project_id=?", project.ID)
	if err != nil {
		return err
	}

	return nil
}