"""研发报告 PPT 生成：markdown 报告正文 → .pptx 文件（可下载查证）。

触发时机：opp_submit_report 提交人工确认时生成/更新，存到
项目工作空间 deliverables/ 目录（与报告同源，人工确认时可直接下载审阅）。

设计取舍：
- python-pptx 纯后端生成，无外部模板依赖（模板缺失时降级纯文本版式）。
- markdown 按 # / ## 切页；列表/表格转要点；来源链接保留为文本（PPT 超链接
  兼容性差，查证走界面按钮）。
"""

import logging
import os
import re

logger = logging.getLogger("pipeline.opportunity.ppt")


def _md_to_sections(content):
    """markdown 正文切分为 [(标题, [要点行], 原文块)] 段。

    # 一级标题视为章节页；无标题的连续文本归入"正文"页。
    """
    sections = []
    cur_title = ""
    cur_lines = []
    for raw in (content or "").split("\n"):
        line = raw.rstrip()
        m = re.match(r"^(#{1,3})\s+(.+)$", line)
        if m and len(m.group(1)) <= 2:
            if cur_title or cur_lines:
                sections.append((cur_title, cur_lines))
            cur_title = m.group(2).strip()
            cur_lines = []
            continue
        if line.strip():
            cur_lines.append(line)
    if cur_title or cur_lines:
        sections.append((cur_title, cur_lines))
    return sections


def _line_to_bullet(line):
    """markdown 行 → PPT 要点文本（去标记、保留链接为 文字(链接)）。"""
    s = line.strip()
    s = re.sub(r"^\s*[-*+]\s+", "", s)          # 列表符
    s = re.sub(r"^\s*\d+[.、)]\s*", "", s)       # 有序列表
    s = re.sub(r"\*\*(.+?)\*\*", r"\1", s)      # 粗体
    s = re.sub(r"\*(.+?)\*", r"\1", s)          # 斜体
    s = re.sub(r"^\|.*\|$", lambda m: " | ".join(
        c.strip() for c in m.group(0).strip("|").split("|") if c.strip()), s)  # 表格行
    if re.match(r"^[-: =]+$", s):
        return ""                                # 表格分隔线
    s = re.sub(r"\[([^\]]+)\]\(([^)]+)\)", r"\1（\2）", s)  # 链接 → 文字(链接)
    return s.strip()


def build_report_ppt(title, content, software="", out_path=""):
    """生成 PPT 并保存。返回 (True, 文件路径) 或 (False, 错误)。"""
    try:
        from pptx import Presentation
        from pptx.util import Inches, Pt
        from pptx.dml.color import RGBColor
    except ImportError:
        return False, "缺少 python-pptx（pip install python-pptx）"

    if not out_path:
        return False, "缺少输出路径"

    prs = Presentation()
    prs.slide_width = Inches(13.333)
    prs.slide_height = Inches(7.5)
    blank_layout = prs.slide_layouts[6]

    def _add_title_bar(slide, text, color=(0x1E, 0x40, 0xAF)):
        box = slide.shapes.add_textbox(Inches(0.5), Inches(0.3), Inches(12.3), Inches(0.8))
        tf = box.text_frame
        p = tf.paragraphs[0]
        run = p.add_run()
        run.text = text
        run.font.size = Pt(26)
        run.font.bold = True
        run.font.color.rgb = RGBColor(*color)

    # ── 封面页 ──
    slide = prs.slides.add_slide(blank_layout)
    box = slide.shapes.add_textbox(Inches(0.8), Inches(2.6), Inches(11.7), Inches(2))
    tf = box.text_frame
    tf.word_wrap = True
    p = tf.paragraphs[0]
    run = p.add_run()
    run.text = title or "研发报告"
    run.font.size = Pt(36)
    run.font.bold = True
    run.font.color.rgb = RGBColor(0x0F, 0x17, 0x2A)
    sub = software or ""
    if sub:
        p2 = tf.add_paragraph()
        r2 = p2.add_run()
        r2.text = "方向：%s" % sub
        r2.font.size = Pt(18)
        r2.font.color.rgb = RGBColor(0x64, 0x74, 0x8B)
    p3 = tf.add_paragraph()
    r3 = p3.add_run()
    r3.text = "商机产线 · 数据来自数据爬取平台（可查证）"
    r3.font.size = Pt(14)
    r3.font.color.rgb = RGBColor(0x94, 0xA3, 0xB8)

    # ── 内容页 ──
    sections = _md_to_sections(content)
    for sec_title, lines in sections:
        bullets = [b for b in (_line_to_bullet(l) for l in lines) if b]
        if not sec_title and not bullets:
            continue
        # 要点过多 → 分页（每页 ≤ 8 条，防溢出）
        chunks = [bullets[i:i + 8] for i in range(0, max(len(bullets), 1), 8)] or [[]]
        for ci, chunk in enumerate(chunks):
            slide = prs.slides.add_slide(blank_layout)
            t = sec_title or "正文"
            if len(chunks) > 1:
                t += "（%d/%d）" % (ci + 1, len(chunks))
            _add_title_bar(slide, t)
            box = slide.shapes.add_textbox(Inches(0.7), Inches(1.3), Inches(12), Inches(5.8))
            tf = box.text_frame
            tf.word_wrap = True
            first = True
            for b in chunk:
                p = tf.paragraphs[0] if first else tf.add_paragraph()
                first = False
                run = p.add_run()
                run.text = "• " + b
                run.font.size = Pt(15)
                run.font.color.rgb = RGBColor(0x33, 0x41, 0x55)
                p.space_after = Pt(8)

    # ── 尾页 ──
    slide = prs.slides.add_slide(blank_layout)
    _add_title_bar(slide, "说明", color=(0x64, 0x74, 0x8B))
    box = slide.shapes.add_textbox(Inches(0.7), Inches(1.4), Inches(12), Inches(5))
    tf = box.text_frame
    tf.word_wrap = True
    for i, note in enumerate([
        "本报告全部数据来自数据爬取平台（内网采集、已去重）。",
        "每条引用均带公告原文/采集来源，可在产线平台「数据参考」逐条查证。",
        "报告状态以平台门禁为准（人工确认 → 研发审批），未经审批不得视为立项依据。",
    ]):
        p = tf.paragraphs[0] if i == 0 else tf.add_paragraph()
        run = p.add_run()
        run.text = note
        run.font.size = Pt(15)
        run.font.color.rgb = RGBColor(0x47, 0x55, 0x69)
        p.space_after = Pt(10)

    os.makedirs(os.path.dirname(out_path), exist_ok=True)
    prs.save(out_path)
    try:
        npages = len(prs.slides._sldIdLst)
    except Exception:
        npages = -1
    logger.info("报告 PPT 已生成: %s (%d 页)", out_path, npages)
    return True, out_path