package com.adx.tencent.storage;

import com.adx.tencent.storage.mapper.*;
import com.adx.tencent.storage.model.*;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.Statement;
import java.sql.Timestamp;
import java.time.Instant;
import java.util.List;

/**
 * 对应 Go internal/storage/tidb.go 的 TiDBColdStore。
 * 使用 MyBatis 操作 TiDB（MySQL 协议兼容）。
 * 功能：
 *   1. migrate() - 建表 DDL
 *   2. saveBid / saveTracking / saveConversion / saveMediaCallback
 *   3. successfulCallbackExists / successfulCallbackExistsForEvent
 *   4. pendingMediaCallbacks
 */
public class TiDBColdStore {

    private static final Logger log = LoggerFactory.getLogger(TiDBColdStore.class);
    private static final int CONVERSION_BATCH_SIZE = 1000;

    private final SqlSessionFactory sqlSessionFactory;
    private final ObjectMapper objectMapper;

    public TiDBColdStore(SqlSessionFactory sqlSessionFactory, ObjectMapper objectMapper) {
        this.sqlSessionFactory = sqlSessionFactory;
        this.objectMapper = objectMapper;
    }

    // ─── DDL 迁移 ────────────────────────────────────────────────────────────

    public void migrate() {
        String[] ddls = {
            """
            CREATE TABLE IF NOT EXISTS tencent_ad_bid_events (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                qk VARCHAR(128) NOT NULL,
                media VARCHAR(64),
                media_trace_id VARCHAR(255),
                platform VARCHAR(16),
                req_id VARCHAR(512),
                bid_id VARCHAR(128),
                creative_id VARCHAR(128),
                imp_id VARCHAR(128),
                tag_id VARCHAR(128),
                price BIGINT UNSIGNED,
                show_urls JSON,
                click_urls JSON,
                landing_page TEXT,
                app_store_link TEXT,
                package_name VARCHAR(255),
                media_params JSON,
                created_at TIMESTAMP(3) NOT NULL,
                UNIQUE KEY uk_tencent_ad_bid_events_qk (qk),
                KEY idx_tencent_ad_bid_events_media_trace (media, media_trace_id),
                KEY idx_tencent_ad_bid_events_platform_tag (platform, tag_id),
                KEY idx_tencent_ad_bid_events_created_at (created_at)
            )
            """,
            """
            CREATE TABLE IF NOT EXISTS tencent_tracking_reports (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                qk VARCHAR(128),
                kind VARCHAR(32) NOT NULL,
                tracking_url TEXT NOT NULL,
                status INT NOT NULL,
                ok TINYINT(1) NOT NULL,
                created_at TIMESTAMP(3) NOT NULL,
                KEY idx_tencent_tracking_reports_qk_kind_created_at (qk, kind, created_at)
            )
            """,
            """
            CREATE TABLE IF NOT EXISTS tencent_baidu_conversions (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                dedupe_key VARCHAR(255),
                qk VARCHAR(128),
                media VARCHAR(64),
                tag_id VARCHAR(128),
                date_value VARCHAR(16),
                appsid VARCHAR(128),
                customer_name VARCHAR(128),
                device_id VARCHAR(255),
                conv DOUBLE,
                payment DOUBLE,
                gmv DOUBLE,
                act INT,
                tu VARCHAR(128),
                clk_time VARCHAR(32),
                created_at TIMESTAMP(3) NOT NULL,
                UNIQUE KEY uk_tencent_baidu_conversions_dedupe (dedupe_key),
                KEY idx_tencent_baidu_conversions_qk_act_created_at (qk, act, created_at),
                KEY idx_tencent_baidu_conversions_tag_id (tag_id),
                KEY idx_tencent_baidu_conversions_device_id (device_id)
            )
            """,
            """
            CREATE TABLE IF NOT EXISTS tencent_media_callbacks (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                dedupe_key VARCHAR(255),
                media VARCHAR(64) NOT NULL,
                qk VARCHAR(128),
                callback_url TEXT NOT NULL,
                event_type INT NOT NULL,
                event_time_ms BIGINT NOT NULL,
                purchase DOUBLE,
                status INT NOT NULL,
                ok TINYINT(1) NOT NULL,
                attempt INT NOT NULL DEFAULT 1,
                response_body TEXT,
                error_message TEXT,
                request_body TEXT,
                dispatch_status VARCHAR(32) NOT NULL DEFAULT 'SENT',
                tracking_version VARCHAR(16) NOT NULL DEFAULT 'v1',
                created_at TIMESTAMP(3) NOT NULL,
                KEY idx_tencent_media_callbacks_dedupe_ok_created_at (dedupe_key, ok, created_at),
                KEY idx_tencent_media_callbacks_qk_created_at (qk, created_at),
                KEY idx_tencent_media_callbacks_media_event_created_at (media, event_type, created_at)
            )
            """,
            """
            CREATE TABLE IF NOT EXISTS tencent_tag_event (
                tag_id VARCHAR(32) NOT NULL,
                baidu_act INT NOT NULL COMMENT '百度转化行为',
                tencent_action_type VARCHAR(128) NOT NULL COMMENT '腾讯回传行为',
                PRIMARY KEY (tag_id, baidu_act)
            ) COMMENT '竞价事件记录'
            """
        };
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            Statement stmt = session.getConnection().createStatement();
            for (String ddl : ddls) {
                stmt.execute(ddl);
            }
            // 字段长度补丁（已存在的表可能是旧的 128）
            try {
                stmt.execute("ALTER TABLE tencent_ad_bid_events MODIFY COLUMN req_id VARCHAR(512)");
            } catch (Exception ignored) {}
            // platform 字段补丁
            try {
                stmt.execute("ALTER TABLE tencent_ad_bid_events ADD COLUMN platform VARCHAR(16) AFTER media_trace_id");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_ad_bid_events ADD KEY idx_tencent_ad_bid_events_platform_tag (platform, tag_id)");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_baidu_conversions ADD COLUMN gmv DOUBLE AFTER payment");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_baidu_conversions ADD COLUMN tag_id VARCHAR(128) AFTER media");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_baidu_conversions ADD KEY idx_tencent_baidu_conversions_tag_id (tag_id)");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_media_callbacks ADD COLUMN request_body TEXT AFTER error_message");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_media_callbacks ADD COLUMN dispatch_status VARCHAR(32) NOT NULL DEFAULT 'SENT' AFTER request_body");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_tracking_reports ADD KEY idx_tencent_tracking_reports_created_at_id (created_at, id)");
            } catch (Exception ignored) {}
            try {
                stmt.execute("UPDATE tencent_media_callbacks SET dispatch_status = 'SENT' WHERE dispatch_status IS NULL OR dispatch_status = ''");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_media_callbacks ADD COLUMN tracking_version VARCHAR(16) NOT NULL DEFAULT 'v1' AFTER dispatch_status");
            } catch (Exception ignored) {}
            try {
                stmt.execute("UPDATE tencent_media_callbacks SET tracking_version = 'v1' WHERE tracking_version IS NULL OR tracking_version = ''");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_tag_event ADD COLUMN baidu_act INT NULL COMMENT '百度转化行为' AFTER tag_id");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_tag_event CHANGE COLUMN event_type tencent_action_type VARCHAR(128) NOT NULL COMMENT '腾讯回传行为'");
            } catch (Exception ignored) {}
            try {
                stmt.execute("UPDATE tencent_tag_event SET baidu_act = 0 WHERE baidu_act IS NULL");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_tag_event MODIFY COLUMN baidu_act INT NOT NULL");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_tag_event DROP PRIMARY KEY");
            } catch (Exception ignored) {}
            try {
                stmt.execute("ALTER TABLE tencent_tag_event ADD PRIMARY KEY (tag_id, baidu_act)");
            } catch (Exception ignored) {}
            stmt.close();
        } catch (Exception e) {
            throw new RuntimeException("migrate failed", e);
        }
    }

    // ─── SaveBid ─────────────────────────────────────────────────────────────

    public void saveBid(BidRecord record) {
        if (record.getQk() == null || record.getQk().isBlank()) {
            throw new IllegalArgumentException("qk is required");
        }
        if (record.getCreatedAt() == null) record.setCreatedAt(Instant.now());
        record.setMediaTraceId(record.getMediaTraceId());
        BidRecord cold = record.toColdRecord();

        String mediaParams = toJson(cold.getMediaParams());

        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            BidEventMapper mapper = session.getMapper(BidEventMapper.class);
            mapper.insertOrUpdate(
                cold.getQk(), cold.getMedia(), cold.getMediaTraceId(),
                cold.getPlatform(), cold.getAccountId(), cold.getEventType(),
                cold.getTagId(), cold.getPrice() != null ? cold.getPrice() : 0L,
                cold.getPackageName(), mediaParams, Timestamp.from(cold.getCreatedAt())
            );
        }
    }

    public BidRecord getBidByQk(String qk) {
        if (qk == null || qk.isBlank()) return null;
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            BidEventMapper mapper = session.getMapper(BidEventMapper.class);
            return mapper.selectByQk(qk);
        }
    }

    public List<BidRecord> getBidsByQks(List<String> qks) {
        if (qks == null || qks.isEmpty()) return List.of();
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            BidEventMapper mapper = session.getMapper(BidEventMapper.class);
            return mapper.selectByQks(qks);
        }
    }

    // ─── SaveTracking ─────────────────────────────────────────────────────────

    public void saveTracking(TrackingRecord record) {
        if (record.getCreatedAt() == null) record.setCreatedAt(Instant.now());
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            TrackingReportMapper mapper = session.getMapper(TrackingReportMapper.class);
            mapper.insert(
                record.getQk(), record.getKind(), record.getUrl(),
                record.getStatus(), record.isOk() ? 1 : 0,
                Timestamp.from(record.getCreatedAt())
            );
        }
    }

    // ─── SaveConversion ──────────────────────────────────────────────────────

    public void saveConversion(ConversionRecord record) {
        if (record.getCreatedAt() == null) record.setCreatedAt(Instant.now());
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            ConversionMapper mapper = session.getMapper(ConversionMapper.class);
            mapper.insertOrUpdate(
                record.getDedupeKey(), record.getQk(), record.getMedia(), record.getTagId(),
                record.getDate(), record.getAppSid(), record.getCustomerName(),
                record.getDeviceId(), record.getConv(), record.getPayment(), record.getGmv(),
                record.getAct(), record.getTu(), record.getClkTime(),
                Timestamp.from(record.getCreatedAt())
            );
        }
    }

    public void saveConversions(List<ConversionRecord> records) {
        if (records == null || records.isEmpty()) return;
        long startedAt = System.currentTimeMillis();
        Instant now = Instant.now();
        for (ConversionRecord record : records) {
            if (record.getCreatedAt() == null) record.setCreatedAt(now);
        }
        try (SqlSession session = sqlSessionFactory.openSession(false)) {
            ConversionMapper mapper = session.getMapper(ConversionMapper.class);
            for (int start = 0; start < records.size(); start += CONVERSION_BATCH_SIZE) {
                int end = Math.min(start + CONVERSION_BATCH_SIZE, records.size());
                mapper.batchInsertOrUpdate(records.subList(start, end));
            }
            session.commit();
            long costMs = System.currentTimeMillis() - startedAt;
            int batchCount = (records.size() + CONVERSION_BATCH_SIZE - 1) / CONVERSION_BATCH_SIZE;
            log.info("[TiDBColdStore] saveConversions done: size={}, batches={}, batchSize={}, cost={}ms",
                    records.size(), batchCount, CONVERSION_BATCH_SIZE, costMs);
        }
    }

    // ─── SaveMediaCallback ───────────────────────────────────────────────────

    public void saveMediaCallback(MediaCallbackRecord record) {
        if (record.getCreatedAt() == null) record.setCreatedAt(Instant.now());
        int attempt = record.getAttempt() <= 0 ? 1 : record.getAttempt();
        if (record.getDispatchStatus() == null || record.getDispatchStatus().isBlank()) {
            record.setDispatchStatus(MediaCallbackRecord.DISPATCH_STATUS_SENT);
        }
        if (record.getTrackingVersion() == null || record.getTrackingVersion().isBlank()) {
            record.setTrackingVersion("v1");
        }
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            mapper.insert(
                record.getDedupeKey(), record.getMedia(), record.getQk(),
                record.getCallbackUrl(), record.getEventType(), record.getEventTimeMs(),
                record.getPurchase(), record.getStatus(), record.isOk() ? 1 : 0,
                attempt, record.getResponseBody(), record.getErrorMessage(),
                record.getRequestBody(), record.getDispatchStatus(), record.getTrackingVersion(),
                Timestamp.from(record.getCreatedAt())
            );
        }
    }

    public void saveMediaCallbacks(List<MediaCallbackRecord> records) {
        if (records == null || records.isEmpty()) return;
        for (MediaCallbackRecord record : records) {
            if (record.getCreatedAt() == null) record.setCreatedAt(Instant.now());
            if (record.getAttempt() <= 0) record.setAttempt(1);
            if (record.getDispatchStatus() == null || record.getDispatchStatus().isBlank()) {
                record.setDispatchStatus(MediaCallbackRecord.DISPATCH_STATUS_SENT);
            }
            if (record.getTrackingVersion() == null || record.getTrackingVersion().isBlank()) {
                record.setTrackingVersion("v1");
            }
        }
        try (SqlSession session = sqlSessionFactory.openSession(ExecutorType.BATCH, false)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            mapper.batchInsert(records);
            session.commit();
        }
    }

    // ─── 查询：成功回调是否存在 ────────────────────────────────────────────────

    public boolean successfulCallbackExists(String dedupeKey) {
        if (dedupeKey == null || dedupeKey.isBlank()) return false;
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            int count = mapper.countSuccessfulByDedupeKey(dedupeKey);
            return count > 0;
        }
    }

    public boolean successfulCallbackExistsForEvent(String dedupeKey, String legacyDedupeKey, int eventType) {
        if (dedupeKey == null || dedupeKey.isBlank()) return false;
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            int count = mapper.countSuccessfulForEvent(dedupeKey, legacyDedupeKey, eventType);
            return count > 0;
        }
    }

    public List<String> successfulCallbackKeys(List<String> dedupeKeys) {
        if (dedupeKeys == null || dedupeKeys.isEmpty()) return List.of();
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            return mapper.selectSuccessfulDedupeKeys(dedupeKeys);
        }
    }

    public List<String> successfulCallbackKeysWithLegacy(List<String> dedupeKeys,
                                                         List<String> legacyDedupeKeys,
                                                         List<Integer> eventTypes) {
        if (dedupeKeys == null || dedupeKeys.isEmpty()) return List.of();
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            return mapper.selectSuccessfulKeysWithLegacy(dedupeKeys, legacyDedupeKeys, eventTypes);
        }
    }

    // ─── 查询：待重试的回调 ────────────────────────────────────────────────────

    public List<MediaCallbackRecord> pendingMediaCallbacks(String media, int limit) {
        if (limit <= 0) limit = 100;
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            return mapper.selectPendingCallbacks(media, limit);
        }
    }

    public MediaCallbackRecord getMediaCallbackById(long id) {
        if (id <= 0) return null;
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            return mapper.selectById(id);
        }
    }

    public void updateMediaCallback(MediaCallbackRecord record) {
        if (record == null || record.getId() == null || record.getId() <= 0) {
            throw new IllegalArgumentException("media callback id is required");
        }
        int attempt = record.getAttempt() <= 0 ? 1 : record.getAttempt();
        record.setAttempt(attempt);
        if (record.getDispatchStatus() == null || record.getDispatchStatus().isBlank()) {
            record.setDispatchStatus(MediaCallbackRecord.DISPATCH_STATUS_SENT);
        }
        if (record.getTrackingVersion() == null || record.getTrackingVersion().isBlank()) {
            record.setTrackingVersion("v1");
        }
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            MediaCallbackMapper mapper = session.getMapper(MediaCallbackMapper.class);
            mapper.updateById(record);
        }
    }

    // ─── 查询：广告位回传方式配置 ──────────────────────────────────────────────

    public List<TagEventRecord> listAllTagEvents() {
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            TagEventMapper mapper = session.getMapper(TagEventMapper.class);
            return mapper.selectAll();
        }
    }

    /**
     * 根据广告位ID查询回传方式配置（DB 兜底查询）。
     */
    public TagEventRecord getTagEvent(String tagId, int baiduAct) {
        if (tagId == null || tagId.isBlank()) return null;
        try (SqlSession session = sqlSessionFactory.openSession(true)) {
            TagEventMapper mapper = session.getMapper(TagEventMapper.class);
            return mapper.selectByTagIdAndAct(tagId, baiduAct);
        }
    }

    // ─── 工具方法 ─────────────────────────────────────────────────────────────

    private String toJson(Object value) {
        if (value == null) return "null";
        try {
            return objectMapper.writeValueAsString(value);
        } catch (Exception e) {
            throw new RuntimeException("JSON serialize failed", e);
        }
    }
}