package app

import (
	"context"
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"errors"
	"strings"
	"time"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
	"go.uber.org/zap"

	"github.com/geo-platform/tenant-api/internal/shared/auth"
	"github.com/geo-platform/tenant-api/internal/shared/response"
)

const minBrowserExtensionVersion = "0.1.0"

type MediaService struct {
	pool   *pgxpool.Pool
	logger *zap.Logger
}

func NewMediaService(pool *pgxpool.Pool, logger *zap.Logger) *MediaService {
	return &MediaService{pool: pool, logger: logger}
}

type MediaPlatformResponse struct {
	ID          int64   `json:"id"`
	PlatformID  string  `json:"platform_id"`
	Name        string  `json:"name"`
	Category    string  `json:"category"`
	ShortName   string  `json:"short_name"`
	AccentColor string  `json:"accent_color"`
	LoginURL    *string `json:"login_url"`
	LogoURL     *string `json:"logo_url"`
	Status      string  `json:"status"`
	SortOrder   int     `json:"sort_order"`
}

type PlatformAccountResponse struct {
	ID               int64                  `json:"id"`
	PlatformID       string                 `json:"platform_id"`
	PlatformName     string                 `json:"platform_name"`
	PlatformCategory string                 `json:"platform_category"`
	PlatformUID      string                 `json:"platform_uid"`
	Nickname         string                 `json:"nickname"`
	AvatarURL        *string                `json:"avatar_url"`
	Status           string                 `json:"status"`
	LoginURL         *string                `json:"login_url"`
	LastCheckAt      *time.Time             `json:"last_check_at"`
	Metadata         map[string]interface{} `json:"metadata,omitempty"`
	CreatedAt        time.Time              `json:"created_at"`
	UpdatedAt        time.Time              `json:"updated_at"`
}

type CreatePluginSessionRequest struct {
	ActionType           string `json:"action_type" binding:"required"`
	PlatformID           string `json:"platform_id" binding:"required"`
	PlatformAccountID    *int64 `json:"platform_account_id"`
	PluginInstallationID *int64 `json:"plugin_installation_id"`
	ResourceType         string `json:"resource_type"`
	ResourceID           *int64 `json:"resource_id"`
}

type CreatePluginSessionResponse struct {
	PluginSessionID  int64     `json:"plugin_session_id"`
	SessionToken     string    `json:"session_token"`
	ExpireAt         time.Time `json:"expire_at"`
	MinPluginVersion string    `json:"min_plugin_version"`
}

type CreatePublishBatchRequest struct {
	PlatformAccountIDs   []int64 `json:"platform_account_ids" binding:"required"`
	PluginInstallationID *int64  `json:"plugin_installation_id"`
	PublishType          string  `json:"publish_type"`
	CoverAssetURL        *string `json:"cover_asset_url"`
}

type PublishBatchTask struct {
	PublishRecordID   int64     `json:"publish_record_id"`
	PlatformAccountID int64     `json:"platform_account_id"`
	PlatformID        string    `json:"platform_id"`
	PlatformName      string    `json:"platform_name"`
	PlatformUID       string    `json:"platform_uid"`
	PlatformNickname  string    `json:"platform_nickname"`
	PluginSessionID   int64     `json:"plugin_session_id"`
	SessionToken      string    `json:"session_token"`
	ExpireAt          time.Time `json:"expire_at"`
}

type CreatePublishBatchResponse struct {
	PublishBatchID int64              `json:"publish_batch_id"`
	Status         string             `json:"status"`
	Tasks          []PublishBatchTask `json:"tasks"`
}

type PublishRecordResponse struct {
	ID                 int64      `json:"id"`
	PublishBatchID     int64      `json:"publish_batch_id"`
	ArticleID          int64      `json:"article_id"`
	PlatformAccountID  int64      `json:"platform_account_id"`
	PlatformID         string     `json:"platform_id"`
	PlatformName       string     `json:"platform_name"`
	PlatformNickname   string     `json:"platform_nickname"`
	Status             string     `json:"status"`
	ExternalArticleID  *string    `json:"external_article_id"`
	ExternalArticleURL *string    `json:"external_article_url"`
	ExternalManageURL  *string    `json:"external_manage_url"`
	PublishedAt        *time.Time `json:"published_at"`
	ErrorMessage       *string    `json:"error_message"`
	CreatedAt          time.Time  `json:"created_at"`
	UpdatedAt          time.Time  `json:"updated_at"`
}

type PluginBindCallbackRequest struct {
	PluginSessionID int64                  `json:"plugin_session_id" binding:"required"`
	SessionToken    string                 `json:"session_token" binding:"required"`
	PlatformID      string                 `json:"platform_id" binding:"required"`
	PlatformUID     string                 `json:"platform_uid" binding:"required"`
	Nickname        string                 `json:"nickname" binding:"required"`
	AvatarURL       *string                `json:"avatar_url"`
	ClientVersion   *string                `json:"client_version"`
	Metadata        map[string]interface{} `json:"metadata"`
	Status          string                 `json:"status"`
}

type PluginBindCallbackResponse struct {
	PlatformAccountID int64  `json:"platform_account_id"`
	Status            string `json:"status"`
}

type PluginPublishCallbackRequest struct {
	PluginSessionID    int64                  `json:"plugin_session_id" binding:"required"`
	SessionToken       string                 `json:"session_token" binding:"required"`
	ArticleID          int64                  `json:"article_id" binding:"required"`
	PublishRecordID    int64                  `json:"publish_record_id" binding:"required"`
	PlatformAccountID  int64                  `json:"platform_account_id" binding:"required"`
	PlatformID         string                 `json:"platform_id" binding:"required"`
	Status             string                 `json:"status" binding:"required"`
	ExternalArticleID  *string                `json:"external_article_id"`
	ExternalArticleURL *string                `json:"external_article_url"`
	ExternalManageURL  *string                `json:"external_manage_url"`
	PublishedAt        *time.Time             `json:"published_at"`
	ClientVersion      *string                `json:"client_version"`
	RequestPayload     map[string]interface{} `json:"request_payload"`
	ResponsePayload    map[string]interface{} `json:"response_payload"`
	ErrorMessage       *string                `json:"error_message"`
}

type PluginPublishCallbackResponse struct {
	PublishRecordID int64  `json:"publish_record_id"`
	BatchStatus     string `json:"batch_status"`
	ArticleStatus   string `json:"article_status"`
}

type RegisterPluginInstallationRequest struct {
	InstallationKey  string `json:"installation_key" binding:"required"`
	InstallationName string `json:"installation_name" binding:"required"`
	BrowserName      string `json:"browser_name"`
	ClientVersion    string `json:"client_version"`
}

type RegisterPluginInstallationResponse struct {
	PluginInstallationID int64     `json:"plugin_installation_id"`
	InstallationToken    string    `json:"installation_token"`
	Status               string    `json:"status"`
	LastSeenAt           time.Time `json:"last_seen_at"`
}

type platformAccountSeed struct {
	ID           int64
	PlatformID   string
	PlatformName string
	PlatformUID  string
	Nickname     string
}

type pluginSessionRow struct {
	ID                   int64
	TenantID             int64
	UserID               int64
	PluginInstallationID *int64
	ActionType           string
	ResourceType         *string
	ResourceID           *int64
	PlatformAccountID    *int64
	PlatformID           string
	ExpireAt             time.Time
}

func (s *MediaService) ListPlatforms(ctx context.Context) ([]MediaPlatformResponse, error) {
	rows, err := s.pool.Query(ctx, `
		SELECT id, platform_id, name, category, short_name, accent_color, login_url, logo_url, status, sort_order
		FROM media_platforms
		WHERE status = 'active'
		ORDER BY sort_order ASC, id ASC
	`)
	if err != nil {
		return nil, response.ErrInternal(50030, "media_platform_query_failed", "failed to list media platforms")
	}
	defer rows.Close()

	items := make([]MediaPlatformResponse, 0)
	for rows.Next() {
		var item MediaPlatformResponse
		if err := rows.Scan(
			&item.ID,
			&item.PlatformID,
			&item.Name,
			&item.Category,
			&item.ShortName,
			&item.AccentColor,
			&item.LoginURL,
			&item.LogoURL,
			&item.Status,
			&item.SortOrder,
		); err != nil {
			return nil, response.ErrInternal(50030, "media_platform_scan_failed", err.Error())
		}
		items = append(items, item)
	}
	return items, nil
}

func (s *MediaService) RegisterPluginInstallation(ctx context.Context, req RegisterPluginInstallationRequest) (*RegisterPluginInstallationResponse, error) {
	actor := auth.MustActor(ctx)
	installationKey := strings.TrimSpace(req.InstallationKey)
	installationName := strings.TrimSpace(req.InstallationName)
	if installationKey == "" || installationName == "" {
		return nil, response.ErrBadRequest(40038, "invalid_plugin_installation", "installation_key and installation_name are required")
	}

	installationToken, err := newSessionToken()
	if err != nil {
		return nil, response.ErrInternal(50060, "installation_token_failed", "failed to generate installation token")
	}
	tokenHash := auth.HashToken(installationToken)
	lastSeenAt := time.Now().UTC()
	browserName := limitStringPointer(nilIfBlank(req.BrowserName), 64)
	clientVersion := limitStringPointer(nilIfBlank(req.ClientVersion), 32)

	tx, err := s.pool.Begin(ctx)
	if err != nil {
		return nil, response.ErrInternal(50061, "installation_begin_failed", "failed to start installation registration")
	}
	defer tx.Rollback(ctx)

	var installationID int64
	err = tx.QueryRow(ctx, `
		SELECT id
		FROM plugin_installations
		WHERE tenant_id = $1 AND installation_key = $2 AND deleted_at IS NULL
		LIMIT 1
	`, actor.TenantID, installationKey).Scan(&installationID)

	switch {
	case errors.Is(err, pgx.ErrNoRows):
		if err := tx.QueryRow(ctx, `
			INSERT INTO plugin_installations (
				tenant_id, user_id, installation_key, installation_name, browser_name,
				client_version, installation_token_hash, status, last_seen_at
			)
			VALUES ($1, $2, $3, $4, $5, $6, $7, 'active', $8)
			RETURNING id
		`, actor.TenantID, actor.UserID, installationKey, installationName, browserName, clientVersion, tokenHash, lastSeenAt).Scan(&installationID); err != nil {
			return nil, response.ErrInternal(50062, "installation_insert_failed", "failed to register plugin installation")
		}
	case err != nil:
		return nil, response.ErrInternal(50063, "installation_lookup_failed", "failed to lookup plugin installation")
	default:
		if _, err := tx.Exec(ctx, `
			UPDATE plugin_installations
			SET user_id = $1,
			    installation_name = $2,
			    browser_name = $3,
			    client_version = $4,
			    installation_token_hash = $5,
			    status = 'active',
			    last_seen_at = $6,
			    updated_at = NOW()
			WHERE id = $7
		`, actor.UserID, installationName, browserName, clientVersion, tokenHash, lastSeenAt, installationID); err != nil {
			return nil, response.ErrInternal(50064, "installation_update_failed", "failed to refresh plugin installation")
		}
	}

	if err := tx.Commit(ctx); err != nil {
		return nil, response.ErrInternal(50065, "installation_commit_failed", "failed to commit plugin installation")
	}

	return &RegisterPluginInstallationResponse{
		PluginInstallationID: installationID,
		InstallationToken:    installationToken,
		Status:               "active",
		LastSeenAt:           lastSeenAt,
	}, nil
}

func (s *MediaService) ListPlatformAccounts(ctx context.Context) ([]PlatformAccountResponse, error) {
	actor := auth.MustActor(ctx)
	rows, err := s.pool.Query(ctx, `
		SELECT pa.id, pa.platform_id, mp.name, mp.category, pa.platform_uid, pa.nickname,
		       pa.avatar_url, pa.status, mp.login_url, pa.last_check_at, pa.metadata_json,
		       pa.created_at, pa.updated_at
		FROM platform_accounts pa
		JOIN media_platforms mp ON mp.platform_id = pa.platform_id
		WHERE pa.tenant_id = $1 AND pa.deleted_at IS NULL
		ORDER BY mp.sort_order ASC, pa.created_at DESC
	`, actor.TenantID)
	if err != nil {
		return nil, response.ErrInternal(50031, "platform_account_query_failed", "failed to list platform accounts")
	}
	defer rows.Close()

	items := make([]PlatformAccountResponse, 0)
	for rows.Next() {
		var item PlatformAccountResponse
		var metadataJSON []byte
		if err := rows.Scan(
			&item.ID,
			&item.PlatformID,
			&item.PlatformName,
			&item.PlatformCategory,
			&item.PlatformUID,
			&item.Nickname,
			&item.AvatarURL,
			&item.Status,
			&item.LoginURL,
			&item.LastCheckAt,
			&metadataJSON,
			&item.CreatedAt,
			&item.UpdatedAt,
		); err != nil {
			return nil, response.ErrInternal(50031, "platform_account_scan_failed", err.Error())
		}
		if len(metadataJSON) > 0 {
			item.Metadata = map[string]interface{}{}
			_ = json.Unmarshal(metadataJSON, &item.Metadata)
		}
		items = append(items, item)
	}
	return items, nil
}

func (s *MediaService) DeletePlatformAccount(ctx context.Context, id int64) error {
	actor := auth.MustActor(ctx)
	tag, err := s.pool.Exec(ctx, `
		UPDATE platform_accounts
		SET deleted_at = NOW(), updated_at = NOW(), status = 'invalid'
		WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL
	`, id, actor.TenantID)
	if err != nil {
		return response.ErrInternal(50032, "platform_account_delete_failed", "failed to unbind platform account")
	}
	if tag.RowsAffected() == 0 {
		return response.ErrNotFound(40431, "platform_account_not_found", "platform account not found")
	}
	return nil
}

func (s *MediaService) CreatePluginSession(ctx context.Context, req CreatePluginSessionRequest) (*CreatePluginSessionResponse, error) {
	actor := auth.MustActor(ctx)
	actionType := strings.TrimSpace(req.ActionType)
	platformID := strings.TrimSpace(req.PlatformID)
	if actionType == "" || platformID == "" {
		return nil, response.ErrBadRequest(40031, "invalid_plugin_session_request", "action_type and platform_id are required")
	}
	if actionType != "bind" && actionType != "check" {
		return nil, response.ErrBadRequest(40032, "invalid_plugin_action", "only bind and check are supported on this endpoint")
	}
	if err := s.validatePluginInstallationOwnership(ctx, actor.TenantID, req.PluginInstallationID); err != nil {
		return nil, err
	}

	if req.PlatformAccountID != nil {
		var exists bool
		if err := s.pool.QueryRow(ctx, `
			SELECT EXISTS(
				SELECT 1 FROM platform_accounts
				WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL
			)
		`, *req.PlatformAccountID, actor.TenantID).Scan(&exists); err != nil {
			return nil, response.ErrInternal(50033, "platform_account_check_failed", "failed to validate platform account")
		}
		if !exists {
			return nil, response.ErrNotFound(40431, "platform_account_not_found", "platform account not found")
		}
	}

	token, err := newSessionToken()
	if err != nil {
		return nil, response.ErrInternal(50034, "session_token_failed", "failed to generate plugin session token")
	}
	expireAt := time.Now().Add(10 * time.Minute).UTC()

	var id int64
	if err := s.pool.QueryRow(ctx, `
		INSERT INTO plugin_sessions (
			tenant_id, user_id, plugin_installation_id, action_type, resource_type, resource_id, platform_account_id,
			platform_id, session_token, expire_at, status
		)
		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, 'pending')
		RETURNING id
	`, actor.TenantID, actor.UserID, req.PluginInstallationID, actionType, nilIfBlank(req.ResourceType), req.ResourceID, req.PlatformAccountID, platformID, token, expireAt).Scan(&id); err != nil {
		return nil, response.ErrInternal(50035, "plugin_session_create_failed", "failed to create plugin session")
	}

	return &CreatePluginSessionResponse{
		PluginSessionID:  id,
		SessionToken:     token,
		ExpireAt:         expireAt,
		MinPluginVersion: minBrowserExtensionVersion,
	}, nil
}

func (s *MediaService) CreatePublishBatch(ctx context.Context, articleID int64, req CreatePublishBatchRequest) (*CreatePublishBatchResponse, error) {
	actor := auth.MustActor(ctx)
	if len(req.PlatformAccountIDs) == 0 {
		return nil, response.ErrBadRequest(40033, "platform_account_ids_required", "select at least one platform account")
	}
	if err := s.validatePluginInstallationOwnership(ctx, actor.TenantID, req.PluginInstallationID); err != nil {
		return nil, err
	}

	publishType := strings.TrimSpace(req.PublishType)
	if publishType == "" {
		publishType = "publish"
	}

	tx, err := s.pool.Begin(ctx)
	if err != nil {
		return nil, response.ErrInternal(50036, "publish_batch_begin_failed", "failed to start publish batch")
	}
	defer tx.Rollback(ctx)

	var articleExists bool
	var generateStatus string
	if err := tx.QueryRow(ctx, `
		SELECT EXISTS(SELECT 1 FROM articles WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL),
		       COALESCE((SELECT generate_status FROM articles WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL), '')
	`, articleID, actor.TenantID).Scan(&articleExists, &generateStatus); err != nil {
		return nil, response.ErrInternal(50037, "article_check_failed", "failed to validate article")
	}
	if !articleExists {
		return nil, response.ErrNotFound(40411, "article_not_found", "article not found")
	}
	if generateStatus != "completed" {
		return nil, response.ErrConflict(40913, "article_not_publishable", "only completed articles can be published")
	}

	accountSeeds, err := loadPlatformAccountsForPublish(ctx, tx, actor.TenantID, req.PlatformAccountIDs)
	if err != nil {
		return nil, err
	}
	if publishBatchRequiresCover(accountSeeds) && strings.TrimSpace(pointerStringValue(req.CoverAssetURL)) == "" {
		return nil, response.ErrBadRequest(40044, "publish_cover_required", "baijiahao publishing requires a cover image")
	}

	var publishBatchID int64
	if err := tx.QueryRow(ctx, `
		INSERT INTO publish_batches (tenant_id, article_id, initiator_user_id, status, publish_type, cover_asset_url)
		VALUES ($1, $2, $3, 'publishing', $4, $5)
		RETURNING id
	`, actor.TenantID, articleID, actor.UserID, publishType, normalizeStringPointer(req.CoverAssetURL)).Scan(&publishBatchID); err != nil {
		return nil, response.ErrInternal(50038, "publish_batch_create_failed", "failed to create publish batch")
	}

	tasks := make([]PublishBatchTask, 0, len(accountSeeds))
	for _, account := range accountSeeds {
		var publishRecordID int64
		if err := tx.QueryRow(ctx, `
			INSERT INTO publish_records (
				tenant_id, publish_batch_id, article_id, platform_account_id, platform_id, status
			)
			VALUES ($1, $2, $3, $4, $5, 'queued')
			RETURNING id
		`, actor.TenantID, publishBatchID, articleID, account.ID, account.PlatformID).Scan(&publishRecordID); err != nil {
			return nil, response.ErrInternal(50039, "publish_record_create_failed", "failed to create publish record")
		}

		token, tokenErr := newSessionToken()
		if tokenErr != nil {
			return nil, response.ErrInternal(50034, "session_token_failed", "failed to generate plugin session token")
		}
		expireAt := time.Now().Add(15 * time.Minute).UTC()

		var pluginSessionID int64
		if err := tx.QueryRow(ctx, `
			INSERT INTO plugin_sessions (
				tenant_id, user_id, plugin_installation_id, action_type, resource_type, resource_id, platform_account_id,
				platform_id, session_token, expire_at, status
			)
			VALUES ($1, $2, $3, 'publish', 'publish_record', $4, $5, $6, $7, $8, 'pending')
			RETURNING id
		`, actor.TenantID, actor.UserID, req.PluginInstallationID, publishRecordID, account.ID, account.PlatformID, token, expireAt).Scan(&pluginSessionID); err != nil {
			return nil, response.ErrInternal(50040, "publish_session_create_failed", "failed to create publish session")
		}

		tasks = append(tasks, PublishBatchTask{
			PublishRecordID:   publishRecordID,
			PlatformAccountID: account.ID,
			PlatformID:        account.PlatformID,
			PlatformName:      account.PlatformName,
			PlatformUID:       account.PlatformUID,
			PlatformNickname:  account.Nickname,
			PluginSessionID:   pluginSessionID,
			SessionToken:      token,
			ExpireAt:          expireAt,
		})
	}

	if _, err := tx.Exec(ctx, `
		UPDATE articles
		SET publish_status = 'publishing', updated_at = NOW()
		WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL
	`, articleID, actor.TenantID); err != nil {
		return nil, response.ErrInternal(50041, "article_publish_status_failed", "failed to update article publish status")
	}

	if err := tx.Commit(ctx); err != nil {
		return nil, response.ErrInternal(50042, "publish_batch_commit_failed", "failed to commit publish batch")
	}

	return &CreatePublishBatchResponse{
		PublishBatchID: publishBatchID,
		Status:         "publishing",
		Tasks:          tasks,
	}, nil
}

func publishBatchRequiresCover(accounts []platformAccountSeed) bool {
	for _, account := range accounts {
		if strings.TrimSpace(account.PlatformID) == "baijiahao" {
			return true
		}
	}
	return false
}

func pointerStringValue(value *string) string {
	if value == nil {
		return ""
	}
	return *value
}

func (s *MediaService) ListArticlePublishRecords(ctx context.Context, articleID int64) ([]PublishRecordResponse, error) {
	actor := auth.MustActor(ctx)
	return s.listArticlePublishRecords(ctx, actor.TenantID, articleID)
}

func (s *MediaService) listArticlePublishRecords(ctx context.Context, tenantID, articleID int64) ([]PublishRecordResponse, error) {
	rows, err := s.pool.Query(ctx, `
		SELECT pr.id, pr.publish_batch_id, pr.article_id, pr.platform_account_id, pr.platform_id,
		       mp.name, pa.nickname, pr.status, pr.external_article_id, pr.external_article_url,
		       pr.external_manage_url, pr.published_at, pr.error_message, pr.created_at, pr.updated_at
		FROM publish_records pr
		JOIN media_platforms mp ON mp.platform_id = pr.platform_id
		JOIN platform_accounts pa ON pa.id = pr.platform_account_id
		WHERE pr.tenant_id = $1 AND pr.article_id = $2
		ORDER BY pr.created_at DESC, pr.id DESC
	`, tenantID, articleID)
	if err != nil {
		return nil, response.ErrInternal(50043, "publish_record_query_failed", "failed to list publish records")
	}
	defer rows.Close()

	items := make([]PublishRecordResponse, 0)
	for rows.Next() {
		var item PublishRecordResponse
		if err := rows.Scan(
			&item.ID,
			&item.PublishBatchID,
			&item.ArticleID,
			&item.PlatformAccountID,
			&item.PlatformID,
			&item.PlatformName,
			&item.PlatformNickname,
			&item.Status,
			&item.ExternalArticleID,
			&item.ExternalArticleURL,
			&item.ExternalManageURL,
			&item.PublishedAt,
			&item.ErrorMessage,
			&item.CreatedAt,
			&item.UpdatedAt,
		); err != nil {
			return nil, response.ErrInternal(50043, "publish_record_scan_failed", err.Error())
		}
		items = append(items, item)
	}
	return items, nil
}

func (s *MediaService) HandleBindCallback(ctx context.Context, req PluginBindCallbackRequest) (*PluginBindCallbackResponse, error) {
	session, err := s.validatePluginSession(ctx, req.PluginSessionID, req.SessionToken, "bind")
	if err != nil {
		return nil, err
	}
	if session.PlatformID != req.PlatformID {
		return nil, response.ErrConflict(40936, "plugin_session_platform_mismatch", "platform does not match plugin session")
	}

	metadataJSON, err := marshalJSON(req.Metadata)
	if err != nil {
		return nil, response.ErrBadRequest(40034, "invalid_bind_metadata", "metadata must be serializable")
	}

	status := strings.TrimSpace(req.Status)
	if status == "" {
		status = "active"
	}

	tx, err := s.pool.Begin(ctx)
	if err != nil {
		return nil, response.ErrInternal(50044, "bind_callback_begin_failed", "failed to start bind callback transaction")
	}
	defer tx.Rollback(ctx)

	var platformAccountID int64
	err = tx.QueryRow(ctx, `
		SELECT id
		FROM platform_accounts
		WHERE tenant_id = $1 AND platform_id = $2 AND platform_uid = $3 AND deleted_at IS NULL
		LIMIT 1
	`, session.TenantID, req.PlatformID, req.PlatformUID).Scan(&platformAccountID)

	switch {
	case errors.Is(err, pgx.ErrNoRows):
		if err := tx.QueryRow(ctx, `
			INSERT INTO platform_accounts (
				tenant_id, user_id, platform_id, platform_uid, nickname, avatar_url, status,
				metadata_json, last_check_at
			)
			VALUES ($1, $2, $3, $4, $5, $6, $7, $8, NOW())
			RETURNING id
		`, session.TenantID, session.UserID, req.PlatformID, req.PlatformUID, req.Nickname, req.AvatarURL, status, metadataJSON).Scan(&platformAccountID); err != nil {
			return nil, response.ErrInternal(50045, "platform_account_insert_failed", "failed to create platform account")
		}
	case err != nil:
		return nil, response.ErrInternal(50046, "platform_account_lookup_failed", "failed to lookup platform account")
	default:
		if _, err := tx.Exec(ctx, `
			UPDATE platform_accounts
			SET user_id = $1,
			    nickname = $2,
			    avatar_url = $3,
			    status = $4,
			    metadata_json = $5,
			    last_check_at = NOW(),
			    updated_at = NOW()
			WHERE id = $6
		`, session.UserID, req.Nickname, req.AvatarURL, status, metadataJSON, platformAccountID); err != nil {
			return nil, response.ErrInternal(50047, "platform_account_update_failed", "failed to update platform account")
		}
	}

	if _, err := tx.Exec(ctx, `
		UPDATE plugin_sessions
		SET client_version = COALESCE($1, client_version), status = 'completed', updated_at = NOW()
		WHERE id = $2
	`, req.ClientVersion, session.ID); err != nil {
		return nil, response.ErrInternal(50048, "plugin_session_update_failed", "failed to finalize bind session")
	}
	if err := touchPluginInstallation(ctx, tx, session.PluginInstallationID); err != nil {
		return nil, err
	}

	if err := tx.Commit(ctx); err != nil {
		return nil, response.ErrInternal(50049, "bind_callback_commit_failed", "failed to commit bind callback")
	}

	return &PluginBindCallbackResponse{
		PlatformAccountID: platformAccountID,
		Status:            status,
	}, nil
}

func (s *MediaService) HandlePublishCallback(ctx context.Context, req PluginPublishCallbackRequest) (*PluginPublishCallbackResponse, error) {
	session, err := s.validatePluginSession(ctx, req.PluginSessionID, req.SessionToken, "publish")
	if err != nil {
		return nil, err
	}
	if session.ResourceType == nil || *session.ResourceType != "publish_record" || session.ResourceID == nil || *session.ResourceID != req.PublishRecordID {
		return nil, response.ErrConflict(40931, "plugin_session_resource_mismatch", "publish record does not match plugin session")
	}
	if session.PlatformAccountID == nil || *session.PlatformAccountID != req.PlatformAccountID {
		return nil, response.ErrConflict(40932, "plugin_session_account_mismatch", "platform account does not match plugin session")
	}
	if session.PlatformID != req.PlatformID {
		return nil, response.ErrConflict(40933, "plugin_session_platform_mismatch", "platform does not match plugin session")
	}

	reqStatus := normalizePublishStatus(req.Status)
	requestPayloadJSON, err := marshalJSON(req.RequestPayload)
	if err != nil {
		return nil, response.ErrBadRequest(40035, "invalid_publish_request_payload", "request_payload must be serializable")
	}
	responsePayloadJSON, err := marshalJSON(req.ResponsePayload)
	if err != nil {
		return nil, response.ErrBadRequest(40036, "invalid_publish_response_payload", "response_payload must be serializable")
	}

	tx, err := s.pool.Begin(ctx)
	if err != nil {
		return nil, response.ErrInternal(50050, "publish_callback_begin_failed", "failed to start publish callback transaction")
	}
	defer tx.Rollback(ctx)

	var publishBatchID int64
	var articleID int64
	if err := tx.QueryRow(ctx, `
		SELECT publish_batch_id, article_id
		FROM publish_records
		WHERE id = $1 AND tenant_id = $2 AND platform_account_id = $3
	`, req.PublishRecordID, session.TenantID, req.PlatformAccountID).Scan(&publishBatchID, &articleID); err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrNotFound(40432, "publish_record_not_found", "publish record not found")
		}
		return nil, response.ErrInternal(50051, "publish_record_lookup_failed", "failed to lookup publish record")
	}
	if req.ArticleID != articleID {
		return nil, response.ErrConflict(40934, "publish_article_mismatch", "article does not match publish record")
	}

	publishedAt := req.PublishedAt
	if reqStatus == "success" && publishedAt == nil {
		now := time.Now().UTC()
		publishedAt = &now
	}

	if reqStatus != "success" && s.logger != nil {
		s.logger.Warn("publisher callback reported non-success status",
			zap.Int64("plugin_session_id", req.PluginSessionID),
			zap.Int64("publish_record_id", req.PublishRecordID),
			zap.Int64("platform_account_id", req.PlatformAccountID),
			zap.Int64("article_id", req.ArticleID),
			zap.String("platform_id", req.PlatformID),
			zap.String("status", reqStatus),
			zap.Stringp("error_message", req.ErrorMessage),
			zap.Stringp("external_article_id", req.ExternalArticleID),
			zap.Stringp("external_article_url", req.ExternalArticleURL),
			zap.Any("request_payload", req.RequestPayload),
			zap.Any("response_payload", req.ResponsePayload),
		)
	}

	if _, err := tx.Exec(ctx, `
		UPDATE publish_records
		SET status = $1,
		    external_article_id = $2,
		    external_article_url = $3,
		    external_manage_url = $4,
		    published_at = $5,
		    request_payload_json = $6,
		    response_payload_json = $7,
		    error_message = $8,
		    updated_at = NOW()
		WHERE id = $9
	`, reqStatus, normalizeStringPointer(req.ExternalArticleID), normalizeStringPointer(req.ExternalArticleURL), normalizeStringPointer(req.ExternalManageURL), publishedAt, requestPayloadJSON, responsePayloadJSON, normalizeStringPointer(req.ErrorMessage), req.PublishRecordID); err != nil {
		return nil, response.ErrInternal(50052, "publish_record_update_failed", "failed to update publish record")
	}

	pluginStatus := "completed"
	if reqStatus == "failed" {
		pluginStatus = "failed"
	}
	if _, err := tx.Exec(ctx, `
		UPDATE plugin_sessions
		SET client_version = COALESCE($1, client_version), status = $2, updated_at = NOW()
		WHERE id = $3
	`, req.ClientVersion, pluginStatus, session.ID); err != nil {
		return nil, response.ErrInternal(50053, "plugin_session_finalize_failed", "failed to finalize publish session")
	}
	if err := touchPluginInstallation(ctx, tx, session.PluginInstallationID); err != nil {
		return nil, err
	}

	batchStatus, err := recalculatePublishBatchStatus(ctx, tx, publishBatchID)
	if err != nil {
		return nil, err
	}
	if _, err := tx.Exec(ctx, `
		UPDATE publish_batches
		SET status = $1, updated_at = NOW()
		WHERE id = $2
	`, batchStatus, publishBatchID); err != nil {
		return nil, response.ErrInternal(50054, "publish_batch_update_failed", "failed to update publish batch")
	}

	articleStatus := batchStatus
	if batchStatus == "success" {
		articleStatus = "success"
	}
	if batchStatus == "failed" {
		articleStatus = "failed"
	}
	if _, err := tx.Exec(ctx, `
		UPDATE articles
		SET publish_status = $1, updated_at = NOW()
		WHERE id = $2 AND tenant_id = $3 AND deleted_at IS NULL
	`, articleStatus, articleID, session.TenantID); err != nil {
		return nil, response.ErrInternal(50055, "article_publish_update_failed", "failed to update article publish status")
	}

	if err := tx.Commit(ctx); err != nil {
		return nil, response.ErrInternal(50056, "publish_callback_commit_failed", "failed to commit publish callback")
	}

	return &PluginPublishCallbackResponse{
		PublishRecordID: req.PublishRecordID,
		BatchStatus:     batchStatus,
		ArticleStatus:   articleStatus,
	}, nil
}

func (s *MediaService) validatePluginSession(ctx context.Context, pluginSessionID int64, sessionToken, expectedAction string) (*pluginSessionRow, error) {
	sessionToken = strings.TrimSpace(sessionToken)
	if sessionToken == "" {
		return nil, response.ErrUnauthorized(40131, "plugin_session_invalid", "plugin session token is required")
	}

	row := &pluginSessionRow{}
	err := s.pool.QueryRow(ctx, `
		SELECT id, tenant_id, user_id, plugin_installation_id, action_type, resource_type, resource_id, platform_account_id, platform_id, expire_at
		FROM plugin_sessions
		WHERE id = $1 AND session_token = $2
		LIMIT 1
	`, pluginSessionID, sessionToken).Scan(
		&row.ID,
		&row.TenantID,
		&row.UserID,
		&row.PluginInstallationID,
		&row.ActionType,
		&row.ResourceType,
		&row.ResourceID,
		&row.PlatformAccountID,
		&row.PlatformID,
		&row.ExpireAt,
	)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrUnauthorized(40132, "plugin_session_not_found", "plugin session not found")
		}
		return nil, response.ErrInternal(50057, "plugin_session_lookup_failed", "failed to lookup plugin session")
	}
	if row.ActionType != expectedAction {
		return nil, response.ErrConflict(40935, "plugin_session_action_mismatch", "plugin session action mismatch")
	}
	if time.Now().UTC().After(row.ExpireAt) {
		return nil, response.ErrUnauthorized(40133, "plugin_session_expired", "plugin session has expired")
	}
	return row, nil
}

func (s *MediaService) validatePluginInstallationOwnership(ctx context.Context, tenantID int64, pluginInstallationID *int64) error {
	if pluginInstallationID == nil {
		return nil
	}

	var exists bool
	if err := s.pool.QueryRow(ctx, `
		SELECT EXISTS(
			SELECT 1
			FROM plugin_installations
			WHERE id = $1 AND tenant_id = $2 AND status = 'active' AND deleted_at IS NULL
		)
	`, *pluginInstallationID, tenantID).Scan(&exists); err != nil {
		return response.ErrInternal(50066, "plugin_installation_lookup_failed", "failed to validate plugin installation")
	}
	if !exists {
		return response.ErrNotFound(40433, "plugin_installation_not_found", "plugin installation not found")
	}
	return nil
}

func touchPluginInstallation(ctx context.Context, tx pgx.Tx, pluginInstallationID *int64) error {
	if pluginInstallationID == nil {
		return nil
	}
	if _, err := tx.Exec(ctx, `
		UPDATE plugin_installations
		SET last_seen_at = NOW(), updated_at = NOW()
		WHERE id = $1
	`, *pluginInstallationID); err != nil {
		return response.ErrInternal(50067, "plugin_installation_touch_failed", "failed to update plugin installation activity")
	}
	return nil
}

func loadPlatformAccountsForPublish(ctx context.Context, tx pgx.Tx, tenantID int64, ids []int64) ([]platformAccountSeed, error) {
	rows, err := tx.Query(ctx, `
		SELECT pa.id, pa.platform_id, mp.name, pa.platform_uid, pa.nickname
		FROM platform_accounts pa
		JOIN media_platforms mp ON mp.platform_id = pa.platform_id
		WHERE pa.tenant_id = $1
		  AND pa.deleted_at IS NULL
		  AND pa.status = 'active'
		  AND pa.id = ANY($2)
		ORDER BY mp.sort_order ASC, pa.id ASC
	`, tenantID, ids)
	if err != nil {
		return nil, response.ErrInternal(50058, "platform_account_publish_query_failed", "failed to load platform accounts")
	}
	defer rows.Close()

	items := make([]platformAccountSeed, 0, len(ids))
	for rows.Next() {
		var item platformAccountSeed
		if err := rows.Scan(&item.ID, &item.PlatformID, &item.PlatformName, &item.PlatformUID, &item.Nickname); err != nil {
			return nil, response.ErrInternal(50058, "platform_account_publish_scan_failed", err.Error())
		}
		items = append(items, item)
	}
	if len(items) != len(uniqueInt64(ids)) {
		return nil, response.ErrBadRequest(40037, "invalid_platform_accounts", "one or more selected platform accounts are unavailable")
	}
	return items, nil
}

func recalculatePublishBatchStatus(ctx context.Context, tx pgx.Tx, publishBatchID int64) (string, error) {
	rows, err := tx.Query(ctx, `
		SELECT status
		FROM publish_records
		WHERE publish_batch_id = $1
	`, publishBatchID)
	if err != nil {
		return "", response.ErrInternal(50059, "publish_batch_status_query_failed", "failed to aggregate publish batch status")
	}
	defer rows.Close()

	statuses := make([]string, 0)
	for rows.Next() {
		var status string
		if err := rows.Scan(&status); err != nil {
			return "", response.ErrInternal(50059, "publish_batch_status_scan_failed", err.Error())
		}
		statuses = append(statuses, normalizePublishStatus(status))
	}
	return aggregatePublishStatuses(statuses), nil
}

func aggregatePublishStatuses(statuses []string) string {
	if len(statuses) == 0 {
		return "pending"
	}

	counts := map[string]int{}
	for _, status := range statuses {
		counts[normalizePublishStatus(status)]++
	}

	if counts["queued"] > 0 || counts["publishing"] > 0 {
		return "publishing"
	}
	if counts["failed"] == len(statuses) {
		return "failed"
	}
	if counts["success"] == len(statuses) {
		return "success"
	}
	if counts["pending_review"] == len(statuses) {
		return "pending_review"
	}
	if counts["failed"] > 0 && (counts["success"] > 0 || counts["pending_review"] > 0) {
		return "partial_success"
	}
	if counts["pending_review"] > 0 {
		return "pending_review"
	}
	if counts["success"] > 0 {
		return "success"
	}
	return "publishing"
}

func normalizePublishStatus(status string) string {
	switch strings.TrimSpace(status) {
	case "queued":
		return "queued"
	case "publishing", "running":
		return "publishing"
	case "success", "published", "publish_success":
		return "success"
	case "failed", "publish_failed":
		return "failed"
	case "pending_review":
		return "pending_review"
	default:
		return "failed"
	}
}

func normalizeStringPointer(value *string) *string {
	if value == nil {
		return nil
	}
	trimmed := strings.TrimSpace(*value)
	if trimmed == "" {
		return nil
	}
	return &trimmed
}

func nilIfBlank(value string) *string {
	value = strings.TrimSpace(value)
	if value == "" {
		return nil
	}
	return &value
}

func limitStringPointer(value *string, maxLen int) *string {
	if value == nil || maxLen <= 0 {
		return value
	}
	runes := []rune(*value)
	if len(runes) <= maxLen {
		return value
	}
	trimmed := string(runes[:maxLen])
	return &trimmed
}

func marshalJSON(value interface{}) ([]byte, error) {
	if value == nil {
		return nil, nil
	}
	return json.Marshal(value)
}

func newSessionToken() (string, error) {
	buf := make([]byte, 24)
	if _, err := rand.Read(buf); err != nil {
		return "", err
	}
	return hex.EncodeToString(buf), nil
}

func uniqueInt64(values []int64) []int64 {
	seen := make(map[int64]struct{}, len(values))
	result := make([]int64, 0, len(values))
	for _, value := range values {
		if _, ok := seen[value]; ok {
			continue
		}
		seen[value] = struct{}{}
		result = append(result, value)
	}
	return result
}