package database

import (
	"database/sql"
	"time"

	"github.com/jmoiron/sqlx"

	"github.com/peterqiu0516/sub-store/internal/model"
	"github.com/peterqiu0516/sub-store/internal/util"
)

type SourceRepo struct {
	db *sqlx.DB
}

func NewSourceRepo(db *sqlx.DB) *SourceRepo {
	return &SourceRepo{db: db}
}

type sourceRow struct {
	ID          string `db:"id"`
	Name        string `db:"name"`
	Alias       string `db:"alias"`
	Type        string `db:"type"`
	URL         string `db:"url"`
	Content     string `db:"content"`
	Enabled     int    `db:"enabled"`
	FiltersJSON string `db:"filters_json"`
	MetaJSON    string `db:"meta_json"`
	CreatedAt   int64  `db:"created_at"`
	UpdatedAt   int64  `db:"updated_at"`
}

func (r *SourceRepo) List() ([]model.SourceRecord, error) {
	var rows []sourceRow
	if err := r.db.Select(&rows, `SELECT id, name, alias, type, url, content, enabled, filters_json, meta_json, created_at, updated_at FROM sources ORDER BY created_at ASC`); err != nil {
		return nil, err
	}
	result := make([]model.SourceRecord, 0, len(rows))
	for _, row := range rows {
		result = append(result, sourceFromRow(row))
	}
	return result, nil
}

func (r *SourceRepo) Get(id string) (*model.SourceRecord, error) {
	var row sourceRow
	if err := r.db.Get(&row, `SELECT id, name, alias, type, url, content, enabled, filters_json, meta_json, created_at, updated_at FROM sources WHERE id = ?`, id); err != nil {
		if err == sql.ErrNoRows {
			return nil, nil
		}
		return nil, err
	}
	rec := sourceFromRow(row)
	return &rec, nil
}

func (r *SourceRepo) Upsert(input model.SourceRecord) (model.SourceRecord, error) {
	now := time.Now().UnixMilli()
	id := input.ID
	if id == "" {
		id = util.ToId(input.Name)
	}
	existing, _ := r.Get(id)
	createdAt := now
	if existing != nil {
		createdAt = existing.CreatedAt
	}

	filters := input.Filters
	if filters == nil {
		filters = []model.FilterRule{}
	}
	meta := input.Meta
	if meta == nil {
		meta = map[string]any{}
	}

	rec := model.SourceRecord{
		ID:        id,
		Name:      input.Name,
		Alias:     input.Alias,
		Type:      input.Type,
		URL:       input.URL,
		Content:   input.Content,
		Enabled:   input.Enabled,
		Filters:   filters,
		Meta:      meta,
		CreatedAt: createdAt,
		UpdatedAt: now,
	}

	filtersJSON := marshalJSON(filters)
	metaJSON := marshalJSON(meta)
	enabled := boolToInt(rec.Enabled)
	sourceType := rec.Type
	if sourceType == "" {
		sourceType = "remote"
	}
	if sourceType != "local" {
		sourceType = "remote"
	}

	_, err := r.db.Exec(
		`INSERT INTO sources (id, name, alias, type, url, content, enabled, filters_json, meta_json, created_at, updated_at)
		 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
		 ON CONFLICT(id) DO UPDATE SET
		   name = excluded.name, alias = excluded.alias, type = excluded.type, url = excluded.url,
		   content = excluded.content, enabled = excluded.enabled,
		   filters_json = excluded.filters_json, meta_json = excluded.meta_json,
		   updated_at = excluded.updated_at`,
		rec.ID, rec.Name, rec.Alias, sourceType, rec.URL, rec.Content, enabled, filtersJSON, metaJSON, rec.CreatedAt, rec.UpdatedAt,
	)
	if err != nil {
		return rec, err
	}
	return rec, nil
}

func (r *SourceRepo) Delete(id string) error {
	_, err := r.db.Exec("DELETE FROM sources WHERE id = ?", id)
	return err
}

func (r *SourceRepo) Sort(ids []string) error {
	now := time.Now().UnixMilli()
	tx, err := r.db.Beginx()
	if err != nil {
		return err
	}
	defer tx.Rollback()
	for i, id := range ids {
		_, err := tx.Exec("UPDATE sources SET created_at = ?, updated_at = ? WHERE id = ?", now+int64(i), now, id)
		if err != nil {
			return err
		}
	}
	return tx.Commit()
}

func sourceFromRow(row sourceRow) model.SourceRecord {
	sourceType := "remote"
	if row.Type == "local" {
		sourceType = "local"
	}
	return model.SourceRecord{
		ID:        row.ID,
		Name:      row.Name,
		Alias:     row.Alias,
		Type:      sourceType,
		URL:       row.URL,
		Content:   row.Content,
		Enabled:   row.Enabled != 0,
		Filters:   model.UnmarshalFilterRules(row.FiltersJSON),
		Meta:      model.UnmarshalMeta(row.MetaJSON),
		CreatedAt: row.CreatedAt,
		UpdatedAt: row.UpdatedAt,
	}
}