//! 跨 official release 的 Translation Memory SQLite 仓储。

use crate::path_security::{set_file_mode, STATE_FILE_MODE};
use async_trait::async_trait;
use bat_core::domain::{
    TranslationMemoryContext, TranslationMemoryDraft, TranslationMemoryEntry,
    TranslationMemoryMatch, TranslationMemoryMatchKind, TranslationMemorySourceKind,
    TranslationMemorySummary, TranslationMemoryTrustStatus,
};
use bat_core::repositories::TranslationMemoryRepository;
use bat_core::{Error, Result};
use serde::de::DeserializeOwned;
use sqlx::sqlite::{SqliteConnectOptions, SqliteJournalMode, SqlitePoolOptions};
use sqlx::{Row, SqlitePool};
use std::fs;
use std::path::{Path, PathBuf};
use std::str::FromStr;
use std::time::{Duration, SystemTime, UNIX_EPOCH};

/// TM SQLite schema 版本。
pub const TRANSLATION_MEMORY_SCHEMA_VERSION: u32 = 1;
/// TM schema migration component。
pub const TRANSLATION_MEMORY_SCHEMA_COMPONENT: &str = "translation_memory";
/// 默认 TM 数据库文件名。
pub const TRANSLATION_MEMORY_REPOSITORY_FILE: &str = "translation-memory.sqlite";

/// SQLite-backed Translation Memory 仓储。
#[derive(Debug, Clone)]
pub struct SqliteTranslationMemoryRepository {
    pub(crate) pool: SqlitePool,
}

impl SqliteTranslationMemoryRepository {
    /// 创建或打开 TM 数据库并执行迁移。
    pub async fn new(path: impl AsRef<Path>) -> Result<Self> {
        Self::open_with(path.as_ref(), true).await
    }

    /// 只打开已有 TM 数据库，不创建新文件。
    pub async fn open(path: impl AsRef<Path>) -> Result<Self> {
        Self::open_with(path.as_ref(), false).await
    }

    /// 根据 active release 根目录计算默认的跨 release TM 路径。
    ///
    /// 正式 release 根目录形如 `<output>/versions/<id>`，因此默认结果为
    /// `<output>/translation-memory.sqlite`，不会写入已发布版本目录。
    pub fn repository_path(resource_root: &Path) -> PathBuf {
        if resource_root
            .parent()
            .and_then(Path::file_name)
            .is_some_and(|name| name == "versions")
        {
            if let Some(output_root) = resource_root.parent().and_then(Path::parent) {
                return output_root.join(TRANSLATION_MEMORY_REPOSITORY_FILE);
            }
        }
        resource_root.join(TRANSLATION_MEMORY_REPOSITORY_FILE)
    }

    async fn open_with(path: &Path, create_if_missing: bool) -> Result<Self> {
        let absolute = bat_infrastructure_absolute(path)?;
        let parent = absolute.parent().ok_or_else(|| {
            Error::InvalidArgument(format!("TM 数据库缺少父目录：{}", absolute.display()))
        })?;
        ensure_safe_tm_parent(parent)?;
        if create_if_missing {
            tokio::fs::create_dir_all(parent).await?;
            ensure_safe_tm_parent(parent)?;
        }
        if let Ok(metadata) = fs::symlink_metadata(&absolute) {
            if metadata.file_type().is_symlink() {
                return Err(Error::InvalidArgument(format!(
                    "TM 数据库不能是 symlink：{}",
                    absolute.display()
                )));
            }
            if !metadata.is_file() {
                return Err(Error::InvalidArgument(format!(
                    "TM 数据库不是普通文件：{}",
                    absolute.display()
                )));
            }
        } else if !create_if_missing {
            return Err(Error::NotFound(absolute.display().to_string()));
        }

        let options = SqliteConnectOptions::from_str(&format!("sqlite://{}", absolute.display()))
            .map_err(|error| Error::Other(error.into()))?
            .create_if_missing(create_if_missing)
            .journal_mode(SqliteJournalMode::Wal)
            .busy_timeout(Duration::from_secs(30));
        let pool = SqlitePoolOptions::new()
            .max_connections(1)
            .connect_with(options)
            .await
            .map_err(db_error)?;
        set_file_mode(&absolute, STATE_FILE_MODE, "Translation Memory 数据库")
            .map_err(Error::InvalidArgument)?;
        let repository = Self { pool };
        repository.init_schema().await?;
        Ok(repository)
    }

    async fn init_schema(&self) -> Result<()> {
        sqlx::query(
            r#"
            CREATE TABLE IF NOT EXISTS schema_migrations (
                component TEXT PRIMARY KEY NOT NULL,
                version INTEGER NOT NULL CHECK(version >= 1)
            )
            "#,
        )
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        sqlx::query(
            r#"
            CREATE TABLE IF NOT EXISTS translation_memory (
                record_id TEXT PRIMARY KEY NOT NULL,
                source_text TEXT NOT NULL,
                source_hash TEXT NOT NULL,
                normalized_source_text TEXT NOT NULL,
                source_context_json TEXT NOT NULL,
                source_context_hash TEXT NOT NULL,
                translated_text TEXT NOT NULL,
                translation_source_kind TEXT NOT NULL,
                trust_status TEXT NOT NULL,
                official_release_id TEXT NOT NULL,
                source_trace_json TEXT NOT NULL,
                provider TEXT,
                provider_run_id TEXT,
                created_unix_seconds INTEGER NOT NULL,
                updated_unix_seconds INTEGER NOT NULL,
                trusted_unix_seconds INTEGER,
                trusted_by TEXT,
                trusted_reason TEXT,
                supersedes_record_id TEXT,
                superseded_by_record_id TEXT,
                CHECK (length(source_text) > 0),
                CHECK (length(source_hash) > 0),
                CHECK (length(source_context_hash) > 0),
                CHECK (length(official_release_id) > 0),
                CHECK (translation_source_kind IN ('provider', 'manual', 'imported')),
                CHECK (trust_status IN ('candidate', 'trusted', 'superseded', 'rejected'))
            )
            "#,
        )
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        sqlx::query(
            "CREATE INDEX IF NOT EXISTS idx_translation_memory_source_hash \
             ON translation_memory(source_hash)",
        )
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        sqlx::query(
            "CREATE INDEX IF NOT EXISTS idx_translation_memory_normalized_source \
             ON translation_memory(normalized_source_text)",
        )
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        sqlx::query(
            "CREATE INDEX IF NOT EXISTS idx_translation_memory_context \
             ON translation_memory(source_hash, source_context_hash)",
        )
        .execute(&self.pool)
        .await
        .map_err(db_error)?;

        let current: Option<i64> =
            sqlx::query_scalar("SELECT version FROM schema_migrations WHERE component = ?1")
                .bind(TRANSLATION_MEMORY_SCHEMA_COMPONENT)
                .fetch_optional(&self.pool)
                .await
                .map_err(db_error)?;
        if current.is_some_and(|version| version > i64::from(TRANSLATION_MEMORY_SCHEMA_VERSION)) {
            return Err(Error::InvalidArgument(format!(
                "不支持的 Translation Memory schema 版本：{}",
                current.unwrap_or_default()
            )));
        }
        sqlx::query(
            r#"
            INSERT INTO schema_migrations(component, version)
            VALUES (?1, ?2)
            ON CONFLICT(component) DO UPDATE SET version = excluded.version
            "#,
        )
        .bind(TRANSLATION_MEMORY_SCHEMA_COMPONENT)
        .bind(i64::from(TRANSLATION_MEMORY_SCHEMA_VERSION))
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        Ok(())
    }

    async fn find_optional(&self, record_id: &str) -> Result<Option<TranslationMemoryEntry>> {
        let row = sqlx::query(
            r#"
            SELECT record_id, source_text, source_hash, normalized_source_text,
                   source_context_json, source_context_hash, translated_text,
                   translation_source_kind, trust_status, official_release_id,
                   source_trace_json, provider, provider_run_id,
                   created_unix_seconds, updated_unix_seconds, trusted_unix_seconds,
                   trusted_by, trusted_reason, supersedes_record_id, superseded_by_record_id
            FROM translation_memory
            WHERE record_id = ?1
            "#,
        )
        .bind(record_id)
        .fetch_optional(&self.pool)
        .await
        .map_err(db_error)?;
        row.map(row_to_entry).transpose()
    }
}

#[async_trait]
impl TranslationMemoryRepository for SqliteTranslationMemoryRepository {
    async fn upsert_candidate(
        &self,
        draft: TranslationMemoryDraft,
    ) -> Result<TranslationMemoryEntry> {
        validate_draft(&draft)?;
        let entry = entry_from_draft(draft)?;
        if let Some(existing) = self.find_optional(&entry.record_id).await? {
            if existing.trust_status != TranslationMemoryTrustStatus::Candidate {
                return Ok(existing);
            }
            let source_trace_json = serde_json::to_string(&entry.source_trace)
                .map_err(|error| Error::Serialization(error.to_string()))?;
            sqlx::query(
                r#"
                UPDATE translation_memory
                SET source_trace_json = ?2, provider = ?3, provider_run_id = ?4,
                    updated_unix_seconds = ?5
                WHERE record_id = ?1 AND trust_status = 'candidate'
                "#,
            )
            .bind(&entry.record_id)
            .bind(source_trace_json)
            .bind(&entry.provider)
            .bind(&entry.provider_run_id)
            .bind(i64::try_from(entry.updated_unix_seconds).unwrap_or(i64::MAX))
            .execute(&self.pool)
            .await
            .map_err(db_error)?;
            return self.find(&entry.record_id).await;
        }

        let source_context_json = serde_json::to_string(&entry.source_context)
            .map_err(|error| Error::Serialization(error.to_string()))?;
        let source_trace_json = serde_json::to_string(&entry.source_trace)
            .map_err(|error| Error::Serialization(error.to_string()))?;
        let result = sqlx::query(
            r#"
            INSERT INTO translation_memory (
                record_id, source_text, source_hash, normalized_source_text,
                source_context_json, source_context_hash, translated_text,
                translation_source_kind, trust_status, official_release_id,
                source_trace_json, provider, provider_run_id,
                created_unix_seconds, updated_unix_seconds,
                trusted_unix_seconds, trusted_by, trusted_reason,
                supersedes_record_id, superseded_by_record_id
            )
            VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10,
                    ?11, ?12, ?13, ?14, ?14, ?15, ?16, ?17, ?18, ?19)
            ON CONFLICT(record_id) DO UPDATE SET
                source_trace_json = excluded.source_trace_json,
                provider = excluded.provider,
                provider_run_id = excluded.provider_run_id,
                updated_unix_seconds = excluded.updated_unix_seconds
            WHERE translation_memory.trust_status = 'candidate'
            "#,
        )
        .bind(&entry.record_id)
        .bind(&entry.source_text)
        .bind(&entry.source_hash)
        .bind(&entry.normalized_source_text)
        .bind(source_context_json)
        .bind(&entry.source_context_hash)
        .bind(&entry.translated_text)
        .bind(entry.translation_source_kind.as_str())
        .bind(entry.trust_status.as_str())
        .bind(&entry.official_release_id)
        .bind(source_trace_json)
        .bind(&entry.provider)
        .bind(&entry.provider_run_id)
        .bind(i64::try_from(entry.created_unix_seconds).unwrap_or(i64::MAX))
        .bind(
            entry
                .trusted_unix_seconds
                .map(|value| i64::try_from(value).unwrap_or(i64::MAX)),
        )
        .bind(&entry.trusted_by)
        .bind(&entry.trusted_reason)
        .bind(&entry.supersedes_record_id)
        .bind(&entry.superseded_by_record_id)
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        if result.rows_affected() == 0 {
            return self.find(&entry.record_id).await;
        }
        Ok(entry)
    }

    async fn find_matches(
        &self,
        source_text: &str,
        source_context: &TranslationMemoryContext,
        limit: usize,
    ) -> Result<Vec<TranslationMemoryMatch>> {
        if source_text.is_empty() {
            return Err(Error::InvalidArgument(
                "Translation Memory 查询 source_text 不能为空".to_string(),
            ));
        }
        if limit == 0 {
            return Err(Error::InvalidArgument(
                "Translation Memory 查询 limit 必须大于 0".to_string(),
            ));
        }
        let source_hash = hash_text(source_text);
        let normalized_source_text = normalize_source_text(source_text);
        let rows = sqlx::query(
            r#"
            SELECT record_id, source_text, source_hash, normalized_source_text,
                   source_context_json, source_context_hash, translated_text,
                   translation_source_kind, trust_status, official_release_id,
                   source_trace_json, provider, provider_run_id,
                   created_unix_seconds, updated_unix_seconds, trusted_unix_seconds,
                   trusted_by, trusted_reason, supersedes_record_id, superseded_by_record_id
            FROM translation_memory
            WHERE source_hash = ?1 OR normalized_source_text = ?2
            ORDER BY updated_unix_seconds DESC, record_id ASC
            "#,
        )
        .bind(source_hash)
        .bind(&normalized_source_text)
        .fetch_all(&self.pool)
        .await
        .map_err(db_error)?;
        let mut matches = rows
            .into_iter()
            .map(row_to_entry)
            .collect::<Result<Vec<_>>>()?
            .into_iter()
            .filter_map(|entry| {
                let raw_exact = entry.source_text == source_text;
                let normalized_exact = entry.normalized_source_text == normalized_source_text;
                if !raw_exact && !normalized_exact {
                    return None;
                }
                let same_context = !source_context.is_empty()
                    && !entry.source_context.is_empty()
                    && entry.source_context == *source_context;
                let strong = raw_exact
                    && same_context
                    && entry.trust_status == TranslationMemoryTrustStatus::Trusted;
                let match_kind = if strong {
                    TranslationMemoryMatchKind::StrongExact
                } else if raw_exact {
                    TranslationMemoryMatchKind::CandidateExact
                } else {
                    TranslationMemoryMatchKind::SourceOnly
                };
                Some(TranslationMemoryMatch {
                    can_auto_reuse: strong,
                    entry,
                    match_kind,
                })
            })
            .collect::<Vec<_>>();
        matches.sort_by(|left, right| {
            match_rank(left)
                .cmp(&match_rank(right))
                .then_with(|| {
                    right
                        .entry
                        .updated_unix_seconds
                        .cmp(&left.entry.updated_unix_seconds)
                })
                .then_with(|| left.entry.record_id.cmp(&right.entry.record_id))
        });
        matches.truncate(limit);
        Ok(matches)
    }

    async fn confirm(
        &self,
        record_id: &str,
        reviewer: &str,
        reason: Option<String>,
    ) -> Result<TranslationMemoryEntry> {
        if reviewer.trim().is_empty() {
            return Err(Error::InvalidArgument(
                "Translation Memory reviewer 不能为空".to_string(),
            ));
        }
        let current = self.find(record_id).await?;
        if current.trust_status == TranslationMemoryTrustStatus::Trusted {
            return Ok(current);
        }
        if current.trust_status != TranslationMemoryTrustStatus::Candidate {
            return Err(Error::InvalidArgument(format!(
                "Translation Memory 记录 {} 当前状态为 {}，不能确认",
                record_id,
                current.trust_status.as_str()
            )));
        }
        let now = unix_seconds_now();
        sqlx::query(
            r#"
            UPDATE translation_memory
            SET trust_status = 'trusted', trusted_unix_seconds = ?2,
                trusted_by = ?3, trusted_reason = ?4, updated_unix_seconds = ?2
            WHERE record_id = ?1 AND trust_status = 'candidate'
            "#,
        )
        .bind(record_id)
        .bind(i64::try_from(now).unwrap_or(i64::MAX))
        .bind(reviewer.trim())
        .bind(reason.filter(|value| !value.trim().is_empty()))
        .execute(&self.pool)
        .await
        .map_err(db_error)?;
        self.find(record_id).await
    }

    async fn find(&self, record_id: &str) -> Result<TranslationMemoryEntry> {
        self.find_optional(record_id)
            .await?
            .ok_or_else(|| Error::NotFound(record_id.to_string()))
    }

    async fn summary(&self) -> Result<TranslationMemorySummary> {
        let row = sqlx::query(
            r#"
            SELECT COUNT(*) AS record_count,
                   SUM(CASE WHEN trust_status = 'trusted' THEN 1 ELSE 0 END) AS trusted_count,
                   SUM(CASE WHEN trust_status = 'candidate' THEN 1 ELSE 0 END) AS candidate_count,
                   SUM(CASE WHEN trust_status = 'superseded' THEN 1 ELSE 0 END) AS superseded_count,
                   SUM(CASE WHEN trust_status = 'rejected' THEN 1 ELSE 0 END) AS rejected_count
            FROM translation_memory
            "#,
        )
        .fetch_one(&self.pool)
        .await
        .map_err(db_error)?;
        Ok(TranslationMemorySummary {
            schema_version: TRANSLATION_MEMORY_SCHEMA_VERSION,
            record_count: row.try_get::<i64, _>("record_count").map_err(db_error)? as u64,
            trusted_count: row.try_get::<i64, _>("trusted_count").map_err(db_error)? as u64,
            candidate_count: row.try_get::<i64, _>("candidate_count").map_err(db_error)? as u64,
            superseded_count: row
                .try_get::<i64, _>("superseded_count")
                .map_err(db_error)? as u64,
            rejected_count: row.try_get::<i64, _>("rejected_count").map_err(db_error)? as u64,
        })
    }
}

/// 由 active official release 根目录计算默认 TM 数据库路径。
pub fn translation_memory_repository_path(resource_root: &Path) -> PathBuf {
    SqliteTranslationMemoryRepository::repository_path(resource_root)
}

/// 从 TextUnit 定位字段构建 TM 上下文。
#[allow(clippy::too_many_arguments)]
pub fn translation_memory_context(
    destination: &str,
    archive_entry: Option<&str>,
    serialized_file: Option<&str>,
    path_id: Option<i64>,
    class_id: Option<i32>,
    field_path: Option<&str>,
    format: Option<&str>,
    asset_name: Option<&str>,
    text_source_kind: Option<&str>,
    parser_context: &TranslationMemoryContext,
) -> TranslationMemoryContext {
    let mut context = TranslationMemoryContext::new();
    context.insert("destination".to_string(), destination.to_string());
    insert_optional(&mut context, "archive_entry", archive_entry);
    insert_optional(&mut context, "serialized_file", serialized_file);
    if let Some(value) = path_id {
        context.insert("path_id".to_string(), value.to_string());
    }
    if let Some(value) = class_id {
        context.insert("class_id".to_string(), value.to_string());
    }
    insert_optional(&mut context, "field_path", field_path);
    insert_optional(&mut context, "format", format);
    insert_optional(&mut context, "asset_name", asset_name);
    insert_optional(&mut context, "text_source_kind", text_source_kind);
    for (key, value) in parser_context {
        context.insert(format!("context.{key}"), value.clone());
    }
    context
}

fn insert_optional(context: &mut TranslationMemoryContext, key: &str, value: Option<&str>) {
    if let Some(value) = value.filter(|value| !value.is_empty()) {
        context.insert(key.to_string(), value.to_string());
    }
}

fn entry_from_draft(draft: TranslationMemoryDraft) -> Result<TranslationMemoryEntry> {
    let source_hash = hash_text(&draft.source_text);
    let normalized_source_text = normalize_source_text(&draft.source_text);
    let source_context_hash = hash_context(&draft.source_context)?;
    let source_kind = draft.translation_source_kind;
    let record_id = record_id(
        &source_hash,
        &source_context_hash,
        &draft.translated_text,
        &draft.official_release_id,
        &source_kind,
    );
    let observed = draft.observed_unix_seconds;
    Ok(TranslationMemoryEntry {
        record_id,
        source_text: draft.source_text,
        source_hash,
        normalized_source_text,
        source_context: draft.source_context,
        source_context_hash,
        translated_text: draft.translated_text,
        translation_source_kind: source_kind,
        trust_status: TranslationMemoryTrustStatus::Candidate,
        official_release_id: draft.official_release_id,
        source_trace: draft.source_trace,
        provider: draft.provider,
        provider_run_id: draft.provider_run_id,
        created_unix_seconds: observed,
        updated_unix_seconds: observed,
        trusted_unix_seconds: None,
        trusted_by: None,
        trusted_reason: None,
        supersedes_record_id: None,
        superseded_by_record_id: None,
    })
}

fn validate_draft(draft: &TranslationMemoryDraft) -> Result<()> {
    if draft.source_text.is_empty() {
        return Err(Error::InvalidArgument(
            "Translation Memory source_text 不能为空".to_string(),
        ));
    }
    if draft.translated_text.trim().is_empty() {
        return Err(Error::InvalidArgument(
            "Translation Memory translated_text 不能为空".to_string(),
        ));
    }
    if draft.official_release_id.trim().is_empty()
        || draft.source_trace.official_release_id.trim().is_empty()
    {
        return Err(Error::InvalidArgument(
            "Translation Memory official_release_id 不能为空".to_string(),
        ));
    }
    if draft.official_release_id != draft.source_trace.official_release_id {
        return Err(Error::InvalidArgument(
            "Translation Memory draft 的 release provenance 不一致".to_string(),
        ));
    }
    Ok(())
}

fn row_to_entry(row: sqlx::sqlite::SqliteRow) -> Result<TranslationMemoryEntry> {
    let source_context = parse_json(row.try_get("source_context_json").map_err(db_error)?)?;
    let source_trace = parse_json(row.try_get("source_trace_json").map_err(db_error)?)?;
    Ok(TranslationMemoryEntry {
        record_id: row.try_get("record_id").map_err(db_error)?,
        source_text: row.try_get("source_text").map_err(db_error)?,
        source_hash: row.try_get("source_hash").map_err(db_error)?,
        normalized_source_text: row.try_get("normalized_source_text").map_err(db_error)?,
        source_context,
        source_context_hash: row.try_get("source_context_hash").map_err(db_error)?,
        translated_text: row.try_get("translated_text").map_err(db_error)?,
        translation_source_kind: parse_source_kind(
            row.try_get::<String, _>("translation_source_kind")
                .map_err(db_error)?
                .as_str(),
        )?,
        trust_status: parse_trust_status(
            row.try_get::<String, _>("trust_status")
                .map_err(db_error)?
                .as_str(),
        )?,
        official_release_id: row.try_get("official_release_id").map_err(db_error)?,
        source_trace,
        provider: row.try_get("provider").map_err(db_error)?,
        provider_run_id: row.try_get("provider_run_id").map_err(db_error)?,
        created_unix_seconds: i64_to_u64(
            row.try_get("created_unix_seconds").map_err(db_error)?,
            "created",
        )?,
        updated_unix_seconds: i64_to_u64(
            row.try_get("updated_unix_seconds").map_err(db_error)?,
            "updated",
        )?,
        trusted_unix_seconds: optional_i64_to_u64(
            row.try_get("trusted_unix_seconds").map_err(db_error)?,
            "trusted",
        )?,
        trusted_by: row.try_get("trusted_by").map_err(db_error)?,
        trusted_reason: row.try_get("trusted_reason").map_err(db_error)?,
        supersedes_record_id: row.try_get("supersedes_record_id").map_err(db_error)?,
        superseded_by_record_id: row.try_get("superseded_by_record_id").map_err(db_error)?,
    })
}

fn parse_json<T: DeserializeOwned>(value: String) -> Result<T> {
    serde_json::from_str(&value).map_err(|error| Error::Serialization(error.to_string()))
}

fn parse_source_kind(value: &str) -> Result<TranslationMemorySourceKind> {
    match value {
        "provider" => Ok(TranslationMemorySourceKind::Provider),
        "manual" => Ok(TranslationMemorySourceKind::Manual),
        "imported" => Ok(TranslationMemorySourceKind::Imported),
        _ => Err(Error::Serialization(format!(
            "未知 Translation Memory source kind：{value}"
        ))),
    }
}

fn parse_trust_status(value: &str) -> Result<TranslationMemoryTrustStatus> {
    match value {
        "candidate" => Ok(TranslationMemoryTrustStatus::Candidate),
        "trusted" => Ok(TranslationMemoryTrustStatus::Trusted),
        "superseded" => Ok(TranslationMemoryTrustStatus::Superseded),
        "rejected" => Ok(TranslationMemoryTrustStatus::Rejected),
        _ => Err(Error::Serialization(format!(
            "未知 Translation Memory trust status：{value}"
        ))),
    }
}

fn match_rank(value: &TranslationMemoryMatch) -> u8 {
    match value.match_kind {
        TranslationMemoryMatchKind::StrongExact if value.can_auto_reuse => 0,
        TranslationMemoryMatchKind::CandidateExact => 1,
        TranslationMemoryMatchKind::SourceOnly => 2,
        TranslationMemoryMatchKind::StrongExact => 1,
    }
}

fn hash_text(value: &str) -> String {
    blake3::hash(value.as_bytes()).to_hex().to_string()
}

fn normalize_source_text(value: &str) -> String {
    value.replace("\r\n", "\n").replace('\r', "\n")
}

fn hash_context(context: &TranslationMemoryContext) -> Result<String> {
    let bytes =
        serde_json::to_vec(context).map_err(|error| Error::Serialization(error.to_string()))?;
    Ok(blake3::hash(&bytes).to_hex().to_string())
}

fn record_id(
    source_hash: &str,
    context_hash: &str,
    translated_text: &str,
    official_release_id: &str,
    source_kind: &TranslationMemorySourceKind,
) -> String {
    let mut key = Vec::new();
    for value in [
        source_hash,
        context_hash,
        translated_text,
        official_release_id,
        source_kind.as_str(),
    ] {
        key.extend_from_slice(value.as_bytes());
        key.push(0);
    }
    format!("tm-{}", blake3::hash(&key).to_hex())
}

fn unix_seconds_now() -> u64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap_or_default()
        .as_secs()
}

fn i64_to_u64(value: i64, label: &str) -> Result<u64> {
    u64::try_from(value)
        .map_err(|_| Error::Serialization(format!("Translation Memory {label} 时间无效")))
}

fn optional_i64_to_u64(value: Option<i64>, label: &str) -> Result<Option<u64>> {
    value.map(|value| i64_to_u64(value, label)).transpose()
}

fn db_error(error: sqlx::Error) -> Error {
    Error::Other(error.into())
}

fn bat_infrastructure_absolute(path: &Path) -> Result<PathBuf> {
    crate::path_security::lexical_absolute(path).map_err(Error::InvalidArgument)
}

fn ensure_safe_tm_parent(parent: &Path) -> Result<()> {
    crate::path_security::ensure_safe_directory_path(parent, "Translation Memory 数据库")
        .map_err(Error::InvalidArgument)
}

#[cfg(test)]
mod tests {
    use super::*;
    use bat_core::domain::TranslationMemorySourceTrace;

    fn draft(release: &str, source: &str, translated: &str) -> TranslationMemoryDraft {
        let source_trace = TranslationMemorySourceTrace {
            official_release_id: release.to_string(),
            unit_id: Some(format!("{release}-unit")),
            task_id: Some(format!("{release}-task")),
            destination: Some("Bundles/story.bundle".to_string()),
            archive_entry: None,
            serialized_file: Some("CAB-story".to_string()),
            path_id: Some(1),
            class_id: Some(49),
            field_path: Some("m_Text".to_string()),
            format: Some("plain".to_string()),
            asset_name: Some("Story".to_string()),
            text_source_kind: Some("text_asset".to_string()),
            source_url: Some("https://example.invalid/story".to_string()),
        };
        TranslationMemoryDraft {
            source_text: source.to_string(),
            source_context: translation_memory_context(
                "Bundles/story.bundle",
                None,
                Some("CAB-story"),
                Some(1),
                Some(49),
                Some("m_Text"),
                Some("plain"),
                Some("Story"),
                Some("text_asset"),
                &TranslationMemoryContext::new(),
            ),
            translated_text: translated.to_string(),
            translation_source_kind: TranslationMemorySourceKind::Provider,
            official_release_id: release.to_string(),
            source_trace,
            provider: Some("mock".to_string()),
            provider_run_id: Some(format!("mock:{release}")),
            observed_unix_seconds: 1,
        }
    }

    #[tokio::test]
    async fn initializes_schema_and_reuses_trusted_entry_across_releases() {
        let temp = tempfile::TempDir::new().unwrap();
        let repository = SqliteTranslationMemoryRepository::new(
            temp.path().join(TRANSLATION_MEMORY_REPOSITORY_FILE),
        )
        .await
        .unwrap();
        let entry = repository
            .upsert_candidate(draft("release-1", "Hello", "你好"))
            .await
            .unwrap();
        assert_eq!(repository.summary().await.unwrap().candidate_count, 1);
        let trusted = repository
            .confirm(&entry.record_id, "reviewer", Some("accepted".to_string()))
            .await
            .unwrap();
        assert_eq!(trusted.trust_status, TranslationMemoryTrustStatus::Trusted);

        let query = draft("release-2", "Hello", "ignored");
        let matches = repository
            .find_matches("Hello", &query.source_context, 10)
            .await
            .unwrap();
        assert_eq!(matches.len(), 1);
        assert_eq!(
            matches[0].match_kind,
            TranslationMemoryMatchKind::StrongExact
        );
        assert!(matches[0].can_auto_reuse);
        assert_eq!(matches[0].entry.translated_text, "你好");
        assert_eq!(matches[0].entry.official_release_id, "release-1");
    }

    #[tokio::test]
    async fn rejects_future_schema_version() {
        let temp = tempfile::TempDir::new().unwrap();
        let path = temp.path().join("tm.sqlite");
        let repository = SqliteTranslationMemoryRepository::new(&path).await.unwrap();
        sqlx::query("UPDATE schema_migrations SET version = ?2 WHERE component = ?1")
            .bind(TRANSLATION_MEMORY_SCHEMA_COMPONENT)
            .bind(i64::from(TRANSLATION_MEMORY_SCHEMA_VERSION) + 1)
            .execute(&repository.pool)
            .await
            .unwrap();
        repository.pool.close().await;

        let error = SqliteTranslationMemoryRepository::new(&path)
            .await
            .unwrap_err();
        assert!(error
            .to_string()
            .contains("不支持的 Translation Memory schema"));
    }

    #[tokio::test]
    async fn different_context_is_candidate_only_and_provider_repeat_is_idempotent() {
        let temp = tempfile::TempDir::new().unwrap();
        let repository = SqliteTranslationMemoryRepository::new(temp.path().join("tm.sqlite"))
            .await
            .unwrap();
        let first = draft("release-1", "Hello", "你好");
        repository.upsert_candidate(first.clone()).await.unwrap();
        repository.upsert_candidate(first).await.unwrap();
        assert_eq!(repository.summary().await.unwrap().record_count, 1);

        let mut different = draft("release-2", "Hello", "你好");
        different
            .source_context
            .insert("field_path".to_string(), "m_Other".to_string());
        let matches = repository
            .find_matches("Hello", &different.source_context, 10)
            .await
            .unwrap();
        assert_eq!(
            matches[0].match_kind,
            TranslationMemoryMatchKind::CandidateExact
        );
        assert!(!matches[0].can_auto_reuse);
    }

    #[tokio::test]
    async fn rejects_empty_translation_candidates() {
        let temp = tempfile::TempDir::new().unwrap();
        let repository = SqliteTranslationMemoryRepository::new(temp.path().join("tm.sqlite"))
            .await
            .unwrap();
        let error = repository
            .upsert_candidate(draft("release-1", "Hello", " \n"))
            .await
            .unwrap_err();
        assert!(error.to_string().contains("translated_text"));
        assert_eq!(repository.summary().await.unwrap().record_count, 0);
    }
}