#!/usr/bin/env python3
"""
微信读书数据展示网站 - Flask 后端
提供 API 接口供前端查询本地 SQLite 数据库中的读书数据
"""

import json
import os
import sqlite3
import time
from datetime import datetime

from flask import Flask, jsonify, render_template, request

app = Flask(__name__, static_folder="static", template_folder="templates")

DB_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), "weread.db")


def get_db():
    conn = sqlite3.connect(DB_PATH)
    conn.row_factory = sqlite3.Row
    return conn


def ts_to_date(ts):
    """时间戳转日期字符串"""
    if not ts or ts == 0:
        return ""
    return datetime.fromtimestamp(ts).strftime("%Y-%m-%d")


def ts_to_year(ts):
    """时间戳转年份"""
    if not ts or ts == 0:
        return ""
    return datetime.fromtimestamp(ts).strftime("%Y")


def format_duration(seconds):
    """秒转可读时长"""
    if not seconds:
        return "0分钟"
    hours = seconds // 3600
    minutes = (seconds % 3600) // 60
    if hours > 0:
        return f"{hours}小时{minutes}分钟"
    return f"{minutes}分钟"


@app.route("/")
def index():
    return render_template("index.html")


@app.route("/api/overview")
def api_overview():
    """总览数据"""
    conn = get_db()
    c = conn.cursor()

    # 总阅读统计
    c.execute("SELECT * FROM reading_stats WHERE mode='overall' LIMIT 1")
    overall = c.fetchone()
    total_read_time = overall["total_read_time"] if overall else 0
    read_days = overall["read_days"] if overall else 0
    regist_time = overall["regist_time"] if overall else 0

    # 今年统计
    current_year = str(time.localtime().tm_year)
    c.execute("SELECT * FROM reading_stats WHERE mode='annually' LIMIT 1")
    annual = c.fetchone()
    year_read_time = annual["total_read_time"] if annual else 0
    year_read_days = annual["read_days"] if annual else 0

    # 书架数量
    c.execute("SELECT COUNT(*) as cnt FROM books")
    shelf_count = c.fetchone()["cnt"]

    # 读完数量
    c.execute("SELECT COUNT(*) as cnt FROM books WHERE finish_reading=1")
    finished_count = c.fetchone()["cnt"]

    # 笔记统计
    c.execute("SELECT COUNT(*) as cnt FROM notebooks")
    notebook_count = c.fetchone()["cnt"]
    c.execute("SELECT SUM(review_count + note_count + bookmark_count) as cnt FROM notebooks")
    total_notes = c.fetchone()["cnt"] or 0

    # 最近阅读时间
    c.execute("SELECT MAX(read_update_time) as max_ts FROM books")
    last_read_ts = c.fetchone()["max_ts"] or 0

    # 采集时间
    c.execute("SELECT value FROM fetch_meta WHERE key='last_fetch_time'")
    fetch_row = c.fetchone()
    fetch_time = fetch_row["value"] if fetch_row else ""

    conn.close()

    return jsonify({
        "total_read_time": total_read_time,
        "total_read_time_str": format_duration(total_read_time),
        "read_days": read_days,
        "year_read_time": year_read_time,
        "year_read_time_str": format_duration(year_read_time),
        "year_read_days": year_read_days,
        "shelf_count": shelf_count,
        "finished_count": finished_count,
        "notebook_count": notebook_count,
        "total_notes": total_notes,
        "regist_time": ts_to_date(regist_time),
        "last_read_time": ts_to_date(last_read_ts),
        "fetch_time": fetch_time,
    })


@app.route("/api/yearly-trend")
def api_yearly_trend():
    """年度阅读时长时间序列"""
    conn = get_db()
    c = conn.cursor()
    c.execute(
        "SELECT bucket_timestamp, duration FROM read_times WHERE mode='overall' ORDER BY bucket_timestamp"
    )
    rows = c.fetchall()
    conn.close()

    data = []
    for row in rows:
        year = ts_to_year(row["bucket_timestamp"])
        hours = round(row["duration"] / 3600, 1)
        data.append({"year": year, "hours": hours, "seconds": row["duration"]})

    return jsonify(data)


@app.route("/api/top-books")
def api_top_books():
    """阅读时长最久的书籍"""
    conn = get_db()
    c = conn.cursor()
    c.execute(
        """SELECT * FROM read_longest WHERE mode='overall'
           ORDER BY read_time DESC LIMIT 20"""
    )
    rows = c.fetchall()
    conn.close()

    books = []
    for row in rows:
        tags = json.loads(row["tags"]) if row["tags"] else []
        books.append({
            "book_id": row["book_id"],
            "title": row["title"],
            "author": row["author"],
            "cover": row["cover"],
            "read_time": row["read_time"],
            "read_time_str": format_duration(row["read_time"]),
            "tags": tags,
        })

    return jsonify(books)


@app.route("/api/categories")
def api_categories():
    """偏好分类"""
    conn = get_db()
    c = conn.cursor()
    c.execute(
        """SELECT * FROM prefer_categories WHERE mode='overall'
           AND reading_time > 0
           ORDER BY reading_time DESC"""
    )
    rows = c.fetchall()
    conn.close()

    cats = []
    for row in rows:
        cats.append({
            "category_title": row["category_title"],
            "parent_category_title": row["parent_category_title"],
            "reading_time": row["reading_time"],
            "reading_time_str": format_duration(row["reading_time"]),
            "reading_count": row["reading_count"],
            "val": row["val"],
        })

    return jsonify(cats)


@app.route("/api/authors")
def api_authors():
    """偏好作者"""
    conn = get_db()
    c = conn.cursor()
    c.execute(
        """SELECT * FROM prefer_authors WHERE mode='overall'
           ORDER BY count DESC LIMIT 20"""
    )
    rows = c.fetchall()
    conn.close()

    authors = []
    for row in rows:
        authors.append({
            "name": row["name"],
            "count": row["count"],
            "read_time": row["read_time"],
        })

    return jsonify(authors)


@app.route("/api/time-distribution")
def api_time_distribution():
    """24小时阅读时段分布"""
    conn = get_db()
    c = conn.cursor()
    c.execute(
        """SELECT hour_index, SUM(duration) as total
           FROM prefer_time WHERE mode='overall'
           GROUP BY hour_index ORDER BY hour_index"""
    )
    rows = c.fetchall()
    conn.close()

    dist = []
    for row in rows:
        dist.append({
            "hour": row["hour_index"],
            "duration": row["total"],
            "duration_min": round(row["total"] / 60, 1),
        })

    return jsonify(dist)


@app.route("/api/shelf")
def api_shelf():
    """书架列表"""
    page = int(request.args.get("page", 1))
    per_page = int(request.args.get("per_page", 60))
    category = request.args.get("category", "")
    finished_only = request.args.get("finished", "0") == "1"

    offset = (page - 1) * per_page
    conn = get_db()
    c = conn.cursor()

    where_clauses = []
    params = []
    if category:
        where_clauses.append("category LIKE ?")
        params.append(f"%{category}%")
    if finished_only:
        where_clauses.append("finish_reading=1")

    where_sql = " WHERE " + " AND ".join(where_clauses) if where_clauses else ""

    c.execute(f"SELECT COUNT(*) as cnt FROM books{where_sql}", params)
    total = c.fetchone()["cnt"]

    c.execute(
        f"SELECT * FROM books{where_sql} ORDER BY is_top DESC, read_update_time DESC LIMIT ? OFFSET ?",
        params + [per_page, offset],
    )
    rows = c.fetchall()

    # 获取分类列表
    c.execute("SELECT DISTINCT category FROM books WHERE category != '' ORDER BY category")
    categories = [r["category"] for r in c.fetchall()]

    conn.close()

    books = []
    for row in rows:
        books.append({
            "book_id": row["book_id"],
            "title": row["title"],
            "author": row["author"],
            "cover": row["cover"],
            "category": row["category"],
            "finish_reading": row["finish_reading"],
            "read_update_time": ts_to_date(row["read_update_time"]),
            "secret": row["secret"],
            "is_top": row["is_top"],
            "deep_link": row["deep_link"],
        })

    return jsonify({
        "books": books,
        "total": total,
        "page": page,
        "per_page": per_page,
        "total_pages": (total + per_page - 1) // per_page,
        "categories": categories,
    })


@app.route("/api/notebooks")
def api_notebooks():
    """笔记本概览"""
    conn = get_db()
    c = conn.cursor()
    c.execute(
        """SELECT * FROM notebooks
           ORDER BY (review_count + note_count + bookmark_count) DESC"""
    )
    rows = c.fetchall()
    conn.close()

    notebooks = []
    for row in rows:
        total = row["review_count"] + row["note_count"] + row["bookmark_count"]
        notebooks.append({
            "book_id": row["book_id"],
            "title": row["title"],
            "author": row["author"],
            "cover": row["cover"],
            "review_count": row["review_count"],
            "note_count": row["note_count"],
            "bookmark_count": row["bookmark_count"],
            "total_notes": total,
            "reading_progress": row["reading_progress"],
            "marked_status": row["marked_status"],
        })

    return jsonify(notebooks)


@app.route("/api/read-stats")
def api_read_stats():
    """阅读统计摘要项"""
    conn = get_db()
    c = conn.cursor()
    c.execute("SELECT * FROM read_stat_items WHERE mode='overall'")
    rows = c.fetchall()
    conn.close()

    stats = []
    for row in rows:
        stats.append({
            "stat": row["stat_name"],
            "counts": row["counts"],
            "scheme": row["scheme"],
        })

    return jsonify(stats)


@app.route("/api/archives")
def api_archives():
    """书单"""
    conn = get_db()
    c = conn.cursor()
    c.execute("SELECT * FROM archives")
    rows = c.fetchall()
    conn.close()

    archives = []
    for row in rows:
        book_ids = json.loads(row["book_ids"]) if row["book_ids"] else []
        archives.append({
            "name": row["name"],
            "book_count": len(book_ids),
            "book_ids": book_ids,
        })

    return jsonify(archives)


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8080, debug=False)