package mysqldriver

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

var counterKindIssueID = "NextIssueID"
var counterKindIssueSubID = "NextIssueSubID"

type issueRepository struct {
	db *sqlx.DB
}

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

		return nil, err
	}

	return &issue, nil
}

func (r *issueRepository) List(ctx context.Context, filter models.IssueFilter) ([]*models.Issue, error) {
	q := sq.Select("*").From("issue").OrderBy("updated_time DESC")
	if len(filter.IssueIDs) > 0 {
		q = q.Where(sq.Eq{"issue_id": filter.IssueIDs})
	}
	if len(filter.ProjectIDs) > 0 {
		q = q.Where(sq.Eq{"project_id": filter.ProjectIDs})
	}
	if len(filter.OwnerIDs) > 0 {
		q = q.Where(sq.Eq{"owner_id": filter.OwnerIDs})
	}
	if len(filter.AssigneeIDs) > 0 {
		q = q.Where(sq.Eq{"assignee_id": filter.AssigneeIDs})
	}
	if filter.Search != nil && *filter.Search != "" {
		q = q.Where("MATCH (name, title, description) AGAINST (?)", *filter.Search)
	}
	if filter.MinStage != nil {
		q = q.Where(sq.GtOrEq{"status_stage": *filter.MinStage})
	}
	if filter.MaxStage != nil {
		q = q.Where(sq.LtOrEq{"status_stage": *filter.MaxStage})
	}
	if filter.Limit != nil && *filter.Limit > 0 {
		q = q.Limit(uint64(*filter.Limit))
	}

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

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

		return nil, err
	}

	return results, nil
}

func (r *issueRepository) Insert(ctx context.Context, issue models.Issue) (*models.Issue, error) {
	if issue.ProjectID == "" {
		return nil, errors.New("missing project id")
	}

	if issue.CreatedTime.IsZero() {
		issue.CreatedTime = time.Now().Truncate(time.Second)
		issue.UpdatedTime = issue.CreatedTime
	}

	tx, err := r.db.BeginTxx(ctx, nil)
	if err != nil {
		return nil, err
	}

	nextID, err := incCounter(ctx, tx, counterKindIssueID, issue.ProjectID)
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}
	issue.ID = fmt.Sprintf("%s-%d", issue.ProjectID, nextID)

	_, err = tx.NamedExecContext(ctx, `
		INSERT INTO issue (
			issue_id, project_id, owner_id, assignee_id, 
			status_stage, status_name, created_time, 
		  updated_time, due_time, name, title, description
		) VALUES (
			:issue_id, :project_id, :owner_id, :assignee_id, 
			:status_stage, :status_name, :created_time, 
		  :updated_time, :due_time, :name, :title, :description
		)
	`, issue)
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}

	err = tx.Commit()
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}

	return &issue, nil
}

func (r *issueRepository) Save(ctx context.Context, issue models.Issue) error {
	_, err := r.db.NamedExecContext(ctx, `
		UPDATE issue
		SET assignee_id=:assignee_id, 
				status_stage=:status_stage, 
				status_name=:status_name, 
				created_time=:created_time, 
		  	updated_time=:updated_time,
				due_time=:due_time,
				name=:name,
				title=:title, 
				description=:description
		WHERE issue_id=:issue_id
	`, issue)
	if err != nil {
		return err
	}

	return nil
}

func (r *issueRepository) Delete(ctx context.Context, issue models.Issue) error {
	tx, err := r.db.BeginTxx(ctx, nil)
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "DELETE FROM issue WHERE issue_id=?", issue.ID)
	if err != nil {
		_ = tx.Rollback()
		return err
	}

	// TODO: delete from issue_*

	err = tx.Commit()
	if err != nil {
		_ = tx.Rollback()
		return err
	}

	return nil
}