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"
)

type issueItemRepository struct {
	db *sqlx.DB
}

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

		return nil, err
	}

	return &issueItem, nil
}

func (r *issueItemRepository) List(ctx context.Context, filter models.IssueItemFilter) ([]*models.IssueItem, error) {
	q := sq.Select("issue_item.*").From("issue_item").GroupBy("issue_item.issue_item_id")
	if len(filter.IssueItemIDs) > 0 {
		q = q.Where(sq.Eq{"issue_item_id": filter.IssueIDs})
	}
	if len(filter.IssueIDs) > 0 {
		q = q.Where(sq.Eq{"issue_id": filter.IssueIDs})
	}
	if len(filter.IssueAssignees) > 0 || len(filter.IssueOwners) > 0 || filter.IssueMinStage != nil || filter.IssueMaxStage != nil {
		q = q.Join("issue ON issue.issue_id = issue_item.issue_id")
	}
	if len(filter.IssueAssignees) > 0 {
		q = q.Where(sq.Eq{"issue.assignee_id": filter.IssueAssignees})
	}
	if len(filter.IssueOwners) > 0 {
		q = q.Where(sq.Eq{"issue.owner_id": filter.IssueOwners})
	}
	if filter.IssueMinStage != nil && filter.IssueMaxStage != nil && *filter.IssueMinStage == *filter.IssueMaxStage {
		q = q.Where(sq.Eq{"issue.status_stage": *filter.IssueMinStage})
	} else {
		if filter.IssueMinStage != nil {
			q = q.Where(sq.GtOrEq{"issue.status_stage": *filter.IssueMinStage})
		}
		if filter.IssueMaxStage != nil {
			q = q.Where(sq.LtOrEq{"issue.status_stage": *filter.IssueMaxStage})
		}
	}
	if len(filter.ItemIDs) > 0 {
		q = q.Where(sq.Eq{"item_id": filter.IssueIDs})
	}
	if len(filter.ItemTags) > 0 {
		q = q.Join("item_tag ON item_tag.item_id = issue_item.item_id").Where(
			sq.Eq{"item_tag.tag": filter.ItemTags},
		)
	}
	if filter.Acquired != nil {
		q = q.Where(sq.Eq{"acquired": *filter.Acquired})
	}

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

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

		return nil, err
	}

	return results, nil
}

func (r *issueItemRepository) Insert(ctx context.Context, item models.IssueItem) (*models.IssueItem, error) {
	if item.IssueID == "" {
		return nil, errors.New("missing issue id")
	}

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

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

	_, err = tx.NamedExecContext(ctx, `
		INSERT INTO issue_item (
			issue_item_id, issue_id, item_id, quantity, acquired
		) VALUES (
			:issue_item_id, :issue_id, :item_id, :quantity, :acquired
		);
	`, item)
	if err != nil {
		_ = tx.Rollback()
		return nil, err
	}

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

	return &item, nil
}

func (r *issueItemRepository) Save(ctx context.Context, item models.IssueItem) error {
	_, err := r.db.NamedExecContext(ctx, `
		UPDATE issue_item SET
			acquired=:acquired,
			quantity=:quantity
		WHERE issue_item_id=:issue_item_id
	`, item)

	return err
}

func (r *issueItemRepository) Delete(ctx context.Context, item models.IssueItem) error {
	_, err := r.db.ExecContext(ctx, "DELETE FROM issue_item WHERE issue_item_id=? LIMIT 1;", item.ID)
	return err
}