package sqlite

import (
	"context"
	"fmt"
	"strings"
)

type ProviderDraft struct {
	ID                  int64
	DraftID             string
	PackID              string
	ProviderID          string
	DisplayName         string
	Platform            string
	BaseURL             string
	SmokeTestModel      string
	SupportedModelsJSON string
	ManifestJSON        string
	SourceHostID        string
	Notes               string
	CreatedAt           string
	UpdatedAt           string
}

type ListProviderDraftsFilter struct {
	PackID     string
	ProviderID string
	Query      string
}

type ProviderDraftsRepo struct {
	db execQuerier
}

func newProviderDraftsRepo(db execQuerier) *ProviderDraftsRepo {
	return &ProviderDraftsRepo{db: db}
}

func (r *ProviderDraftsRepo) Create(ctx context.Context, draft ProviderDraft) (int64, error) {
	draftID := strings.TrimSpace(draft.DraftID)
	packID := strings.TrimSpace(draft.PackID)
	providerID := strings.TrimSpace(draft.ProviderID)
	displayName := strings.TrimSpace(draft.DisplayName)
	platform := strings.TrimSpace(draft.Platform)
	if draft.ManifestJSON = strings.TrimSpace(draft.ManifestJSON); draft.ManifestJSON == "" {
		draft.ManifestJSON = "{}"
	}
	if draft.SupportedModelsJSON = strings.TrimSpace(draft.SupportedModelsJSON); draft.SupportedModelsJSON == "" {
		draft.SupportedModelsJSON = "[]"
	}

	switch {
	case draftID == "":
		return 0, fmt.Errorf("draft_id is required")
	case packID == "":
		return 0, fmt.Errorf("pack_id is required")
	case providerID == "":
		return 0, fmt.Errorf("provider_id is required")
	case displayName == "":
		return 0, fmt.Errorf("display_name is required")
	case platform == "":
		return 0, fmt.Errorf("platform is required")
	}

	result, err := r.db.ExecContext(
		ctx,
		`INSERT INTO provider_drafts (draft_id, pack_id, provider_id, display_name, platform, base_url, smoke_test_model, supported_models_json, manifest_json, source_host_id, notes)
		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
		draftID,
		packID,
		providerID,
		displayName,
		platform,
		strings.TrimSpace(draft.BaseURL),
		strings.TrimSpace(draft.SmokeTestModel),
		draft.SupportedModelsJSON,
		draft.ManifestJSON,
		strings.TrimSpace(draft.SourceHostID),
		strings.TrimSpace(draft.Notes),
	)
	if err != nil {
		return 0, fmt.Errorf("insert provider draft %q: %w", draftID, err)
	}

	id, err := result.LastInsertId()
	if err != nil {
		return 0, fmt.Errorf("read inserted provider draft id for %q: %w", draftID, err)
	}
	return id, nil
}

func (r *ProviderDraftsRepo) UpdateByDraftID(ctx context.Context, draft ProviderDraft) error {
	draftID := strings.TrimSpace(draft.DraftID)
	packID := strings.TrimSpace(draft.PackID)
	providerID := strings.TrimSpace(draft.ProviderID)
	displayName := strings.TrimSpace(draft.DisplayName)
	platform := strings.TrimSpace(draft.Platform)
	if draft.ManifestJSON = strings.TrimSpace(draft.ManifestJSON); draft.ManifestJSON == "" {
		draft.ManifestJSON = "{}"
	}
	if draft.SupportedModelsJSON = strings.TrimSpace(draft.SupportedModelsJSON); draft.SupportedModelsJSON == "" {
		draft.SupportedModelsJSON = "[]"
	}

	switch {
	case draftID == "":
		return fmt.Errorf("draft_id is required")
	case packID == "":
		return fmt.Errorf("pack_id is required")
	case providerID == "":
		return fmt.Errorf("provider_id is required")
	case displayName == "":
		return fmt.Errorf("display_name is required")
	case platform == "":
		return fmt.Errorf("platform is required")
	}

	result, err := r.db.ExecContext(
		ctx,
		`UPDATE provider_drafts
		SET pack_id = ?, provider_id = ?, display_name = ?, platform = ?, base_url = ?, smoke_test_model = ?, supported_models_json = ?, manifest_json = ?, source_host_id = ?, notes = ?, updated_at = CURRENT_TIMESTAMP
		WHERE draft_id = ?`,
		packID,
		providerID,
		displayName,
		platform,
		strings.TrimSpace(draft.BaseURL),
		strings.TrimSpace(draft.SmokeTestModel),
		draft.SupportedModelsJSON,
		draft.ManifestJSON,
		strings.TrimSpace(draft.SourceHostID),
		strings.TrimSpace(draft.Notes),
		draftID,
	)
	if err != nil {
		return fmt.Errorf("update provider draft %q: %w", draftID, err)
	}
	affected, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("read updated provider draft rows for %q: %w", draftID, err)
	}
	if affected == 0 {
		return fmt.Errorf("provider draft %q not found", draftID)
	}
	return nil
}

func (r *ProviderDraftsRepo) GetByDraftID(ctx context.Context, draftID string) (ProviderDraft, error) {
	draftID = strings.TrimSpace(draftID)
	if draftID == "" {
		return ProviderDraft{}, fmt.Errorf("draft_id is required")
	}

	var draft ProviderDraft
	if err := r.db.QueryRowContext(
		ctx,
		`SELECT id, draft_id, pack_id, provider_id, display_name, platform, base_url, smoke_test_model, supported_models_json, manifest_json, source_host_id, notes, created_at, updated_at
		FROM provider_drafts WHERE draft_id = ?`,
		draftID,
	).Scan(
		&draft.ID,
		&draft.DraftID,
		&draft.PackID,
		&draft.ProviderID,
		&draft.DisplayName,
		&draft.Platform,
		&draft.BaseURL,
		&draft.SmokeTestModel,
		&draft.SupportedModelsJSON,
		&draft.ManifestJSON,
		&draft.SourceHostID,
		&draft.Notes,
		&draft.CreatedAt,
		&draft.UpdatedAt,
	); err != nil {
		return ProviderDraft{}, err
	}
	return draft, nil
}

func (r *ProviderDraftsRepo) List(ctx context.Context, filter ListProviderDraftsFilter) ([]ProviderDraft, error) {
	query := `SELECT id, draft_id, pack_id, provider_id, display_name, platform, base_url, smoke_test_model, supported_models_json, manifest_json, source_host_id, notes, created_at, updated_at
		FROM provider_drafts`
	where := make([]string, 0, 3)
	args := make([]any, 0, 3)

	if packID := strings.TrimSpace(filter.PackID); packID != "" {
		where = append(where, "pack_id = ?")
		args = append(args, packID)
	}
	if providerID := strings.TrimSpace(filter.ProviderID); providerID != "" {
		where = append(where, "provider_id = ?")
		args = append(args, providerID)
	}
	if rawQuery := strings.TrimSpace(filter.Query); rawQuery != "" {
		like := "%" + rawQuery + "%"
		where = append(where, "(draft_id LIKE ? OR provider_id LIKE ? OR display_name LIKE ?)")
		args = append(args, like, like, like)
	}
	if len(where) > 0 {
		query += " WHERE " + strings.Join(where, " AND ")
	}
	query += " ORDER BY id DESC"

	rows, err := r.db.QueryContext(ctx, query, args...)
	if err != nil {
		return nil, fmt.Errorf("list provider drafts: %w", err)
	}
	defer rows.Close()

	drafts := make([]ProviderDraft, 0)
	for rows.Next() {
		var draft ProviderDraft
		if err := rows.Scan(
			&draft.ID,
			&draft.DraftID,
			&draft.PackID,
			&draft.ProviderID,
			&draft.DisplayName,
			&draft.Platform,
			&draft.BaseURL,
			&draft.SmokeTestModel,
			&draft.SupportedModelsJSON,
			&draft.ManifestJSON,
			&draft.SourceHostID,
			&draft.Notes,
			&draft.CreatedAt,
			&draft.UpdatedAt,
		); err != nil {
			return nil, fmt.Errorf("scan provider draft: %w", err)
		}
		drafts = append(drafts, draft)
	}
	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("iterate provider drafts: %w", err)
	}
	return drafts, nil
}

func (r *ProviderDraftsRepo) DeleteByDraftID(ctx context.Context, draftID string) error {
	draftID = strings.TrimSpace(draftID)
	if draftID == "" {
		return fmt.Errorf("draft_id is required")
	}

	result, err := r.db.ExecContext(ctx, `DELETE FROM provider_drafts WHERE draft_id = ?`, draftID)
	if err != nil {
		return fmt.Errorf("delete provider draft %q: %w", draftID, err)
	}
	affected, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("read deleted provider draft rows for %q: %w", draftID, err)
	}
	if affected == 0 {
		return fmt.Errorf("provider draft %q not found", draftID)
	}
	return nil
}