/* These extract_odt_*() functions generate odt content and odt zip archive
data.

Caller must call things in a sensible order to create valid content -
e.g. don't call odt_paragraph_start() twice without intervening call to
odt_paragraph_finish(). */

#include "../include/extract.h"

#include "odt_template.h"

#include "astring.h"
#include "document.h"
#include "odt.h"
#include "mem.h"
#include "memento.h"
#include "outf.h"
#include "sys.h"
#include "text.h"
#include "zip.h"

#include <assert.h>
#include <errno.h>
#include <float.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <sys/stat.h>


static int
odt_paragraph_start(extract_alloc_t   *alloc,
                    extract_astring_t *output)
{
    return extract_astring_cat(alloc, output, "\n\n<text:p>");
}

static int
odt_paragraph_finish(extract_alloc_t   *alloc,
                     extract_astring_t *output)
{
    return extract_astring_cat(alloc, output, "</text:p>");
}

/* ODT doesn't seem to support ad-hoc inline font specifications; instead
we have to define a style at the start of the content.xml file. So when
writing content we insert a style name and add the required styles to a
extract_odt_styles_t struct. */

struct extract_odt_style_t
{
    int     id; /* A unique id for this style. */
    font_t  font;
};

struct extract_odt_styles_t
{
    /* Styles are stored sorted. */
    extract_odt_style_t *styles;
    int                  styles_num;
};

static int
odt_style_compare(extract_odt_style_t *a,
                  extract_odt_style_t *b)
{
    int d;
    double dd;

    if ((d = strcmp(a->font.name, b->font.name)))   return d;
    if ((dd = a->font.size - b->font.size) != 0.0)  return (dd > 0.0) ? 1 : -1;
    if ((d = a->font.bold - b->font.bold))          return d;
    if ((d = a->font.italic - b->font.italic))      return d;

    return 0;
}

static int
odt_style_append_definition(extract_alloc_t     *alloc,
                            extract_odt_style_t *style,
                            extract_astring_t   *text)
{
    const char* font_name = style->font.name;

    /* This improves output e.g. for zlib.3.pdf, but clearly a hack. */
    if (0 && strstr(font_name, "Helvetica"))
    {
        font_name = "Liberation Sans";
    }
    outf("style->font_name=%s font_name=%s", style->font.name, font_name);
    if (extract_astring_catf(alloc, text, "<style:style style:name=\"T%i\" style:family=\"text\">", style->id)) return -1;
    if (extract_astring_catf(alloc, text, "<style:text-properties style:font-name=\"%s\"", font_name)) return -1;
    if (extract_astring_catf(alloc, text, " fo:font-size=\"%.2fpt\"", style->font.size)) return -1;
    if (extract_astring_catf(alloc, text, " fo:font-weight=\"%s\"", style->font.bold ? "bold" : "normal")) return -1;
    if (extract_astring_catf(alloc, text, " fo:font-style=\"%s\"", style->font.italic ? "italic" : "normal")) return -1;
    if (extract_astring_cat(alloc, text, " /></style:style>")) return -1;

    return 0;
}

void
extract_odt_styles_free(extract_alloc_t      *alloc,
                        extract_odt_styles_t *styles)
{
    int i;

    for (i=0; i<styles->styles_num; ++i)
    {
        extract_odt_style_t* style = &styles->styles[i];
        extract_free(alloc, &style->font.name);
    }
    extract_free(alloc, &styles->styles);
}

static int
odt_styles_definitions(extract_alloc_t      *alloc,
                       extract_odt_styles_t *styles,
                       extract_astring_t    *out)
{
    int i;

    if (extract_astring_cat(alloc, out, "<office:automatic-styles>")) return -1;
    for (i=0; i<styles->styles_num; ++i)
    {
        if (odt_style_append_definition(alloc, &styles->styles[i], out)) return -1;
    }
    extract_astring_cat(alloc, out, "<style:style style:name=\"gr1\" style:family=\"graphic\">\n");
    extract_astring_cat(alloc, out, "<style:graphic-properties"
            " draw:stroke=\"none\""
            " svg:stroke-color=\"#000000\""
            " draw:fill=\"none\""
            " draw:fill-color=\"#ffffff\""
            " fo:min-height=\"1.9898in\""
            " style:run-through=\"foreground\""
            " style:wrap=\"run-through\""
            " style:number-wrapped-paragraphs=\"no-limit\""
            " style:vertical-pos=\"from-top\""
            " style:vertical-rel=\"paragraph\""
            " style:horizontal-pos=\"from-left\""
            " style:horizontal-rel=\"paragraph\""
            " />\n"
            );
    extract_astring_cat(alloc, out, "<style:paragraph-properties style:writing-mode=\"lr-tb\"/>\n");
    extract_astring_cat(alloc, out, "</style:style>\n");

    /* Style for images. */
    extract_astring_cat(alloc, out, "<style:style style:name=\"fr1\" style:family=\"graphic\" style:parent-style-name=\"Graphics\">\n");
    extract_astring_cat(alloc, out, "<style:graphic-properties"
            " fo:margin-left=\"0in\""
            " fo:margin-right=\"0in\""
            " fo:margin-top=\"0in\""
            " fo:margin-bottom=\"0in\""
            " style:vertical-pos=\"top\""
            " style:vertical-rel=\"baseline\""
            " fo:background-color=\"transparent\""
            " draw:fill=\"none\""
            " draw:fill-color=\"#ffffff\""
            " fo:padding=\"0in\""
            " fo:border=\"none\""
            " style:mirror=\"none\""
            " fo:clip=\"rect(0in, 0in, 0in, 0in)\""
            " draw:luminance=\"0%\""
            " draw:contrast=\"0%\""
            " draw:red=\"0%\""
            " draw:green=\"0%\""
            " draw:blue=\"0%\""
            " draw:gamma=\"100%\""
            " draw:color-inversion=\"false\""
            " draw:image-opacity=\"100%\""
            " draw:color-mode=\"standard\""
            "/>\n");
    extract_astring_cat(alloc, out, "</style:style>\n");

    if (extract_astring_cat(alloc, out, "</office:automatic-styles>")) return -1;

    return 0;
}

/* Adds specified style to <styles> if not already present. Sets *o_style to
point to the style_t within <styles>. */
static int
odt_styles_add(extract_alloc_t      *alloc,
               extract_odt_styles_t *styles,
               font_t               *font,
               extract_odt_style_t **o_style)
{
    extract_odt_style_t style = {0 /*id*/, *font};
    int i;

    /* We keep styles->styles[] sorted; todo: use bsearch or similar when
    searching. */
    for (i=0; i<styles->styles_num; ++i)
    {
        int d = odt_style_compare(&style, &styles->styles[i]);
        if (d == 0)
        {
            *o_style = &styles->styles[i];
            return 0;
        }
        if (d > 0) break;
    }
    /* Insert at position <i>. */
    if (extract_realloc(alloc, &styles->styles, sizeof(styles->styles[0]) * (styles->styles_num+1))) return -1;
    memmove(&styles->styles[i+1], &styles->styles[i], sizeof(styles->styles[0]) * (styles->styles_num - i));
    styles->styles_num += 1;
    styles->styles[i].id = styles->styles_num + 10; /* Leave space for template's built-in styles. */
    if (extract_strdup(alloc, font->name, &styles->styles[i].font.name)) return -1;
    styles->styles[i].font.size = font->size;
    styles->styles[i].font.bold = font->bold;
    styles->styles[i].font.italic = font->italic;
    *o_style = &styles->styles[i];

    return 0;
}

/* Starts a new run. Caller must ensure that s_odt_run_finish() was
called to terminate any previous run. */
static int
extract_odt_run_start(extract_alloc_t      *alloc,
                      extract_astring_t    *content,
                      extract_odt_styles_t *styles,
                      content_state_t      *content_state)
{
    extract_odt_style_t* style;

    if (odt_styles_add(alloc,
                       styles,
                       &content_state->font,
                       &style)) return -1;
    if (extract_astring_catf(alloc, content, "<text:span text:style-name=\"T%i\">", style->id)) return -1;

    return 0;
}

static int
odt_run_finish(extract_alloc_t   *alloc,
               content_state_t   *content_state,
               extract_astring_t *content)
{
    if (content_state)
        content_state->font.name = NULL;
    return extract_astring_cat(alloc, content, "</text:span>");
}

/* Append an empty paragraph to *content. */
static int
odt_append_empty_paragraph(extract_alloc_t      *alloc,
                           extract_astring_t    *content,
                           extract_odt_styles_t *styles)
{
    int e = -1;
    static char fontname[] = "OpenSans";
    content_state_t content_state = {0};

    if (odt_paragraph_start(alloc, content)) goto end;
    /* [This comment is from docx, haven't checked odt.] It seems like our
    choice of font size here doesn't make any difference to the amount of
    vertical space, unless we include a non-space character. Presumably
    something to do with the styles in the template document. */
    content_state.font.name = fontname;
    content_state.font.size = 10;
    content_state.font.bold = 0;
    content_state.font.italic = 0;
    if (extract_odt_run_start(alloc, content, styles, &content_state)) goto end;
    //docx_char_append_string(content, "&#160;");   /* &#160; is non-break space. */
    if (odt_run_finish(alloc, NULL /*content_state*/, content)) goto end;
    if (odt_paragraph_finish(alloc, content)) goto end;
    e = 0;

end:
    return e;
}


/* Append odt xml for <paragraph> to <content>. Updates *content_state if we
change font. */
static int
document_to_odt_content_paragraph(extract_alloc_t      *alloc,
                                  content_state_t      *content_state,
                                  paragraph_t          *paragraph,
                                  extract_astring_t    *content,
                                  extract_odt_styles_t *styles)
{
    int e = -1;
    content_line_iterator  lit;
    line_t                *line;

    if (odt_paragraph_start(alloc, content)) goto end;

    /* Output justification. */
    if ((paragraph->line_flags & paragraph_not_fully_justified) == 0)
    {
        if (extract_astring_cat(alloc, content, "<w:pPr><w:jc w:val=\"both\"/></w:pPr>")) goto end;
    }
    else if ((paragraph->line_flags & paragraph_not_centred) == 0)
    {
        if (extract_astring_cat(alloc, content, "<w:pPr><w:jc w:val=\"center\"/></w:pPr>")) goto end;
    }
    else if ((paragraph->line_flags & (paragraph_not_aligned_left | paragraph_not_aligned_right)) == paragraph_not_aligned_left)
    {
        if (extract_astring_cat(alloc, content, "<w:pPr><w:jc w:val=\"right\"/></w:pPr>")) goto end;
    }
    else if ((paragraph->line_flags & (paragraph_not_aligned_left | paragraph_not_aligned_right)) == paragraph_not_aligned_right)
    {
        if (extract_astring_cat(alloc, content, "<w:pPr><w:jc w:val=\"left\"/></w:pPr>")) goto end;
    }


    for (line = content_line_iterator_init(&lit, &paragraph->content); line != NULL; line = content_line_iterator_next(&lit))
    {
        content_span_iterator  sit;
        span_t                *span;

        for (span = content_span_iterator_init(&sit, &line->content); span != NULL; span = content_span_iterator_next(&sit))
        {
            int si;
            double font_size_new;

            content_state->ctm_prev = &span->ctm;
            font_size_new = extract_font_size(&span->ctm);
            if (!content_state->font.name
                    || strcmp(span->font_name, content_state->font.name)
                    || span->flags.font_bold != content_state->font.bold
                    || span->flags.font_italic != content_state->font.italic
                    || font_size_new != content_state->font.size
                    )
            {
                if (content_state->font.name)
                {
                    if (odt_run_finish(alloc, content_state, content)) goto end;
                }
                content_state->font.name = span->font_name;
                content_state->font.bold = span->flags.font_bold;
                content_state->font.italic = span->flags.font_italic;
                content_state->font.size = font_size_new;
                if (extract_odt_run_start( alloc, content, styles, content_state)) goto end;
            }

            for (si=0; si<span->chars_num; ++si)
            {
                char_t* char_ = &span->chars[si];
                int c = char_->ucs;
                if (extract_astring_catc_unicode_xml(alloc, content, c)) goto end;
            }
            /* Remove any trailing '-' at end of line. */
            if (extract_astring_char_truncate_if(content, '-')) goto end;
        }
        if (paragraph->line_flags & paragraph_breaks_strangely)
        {
            if (extract_astring_cat(alloc, content, "<w:br/>")) goto end;
        }
    }
    if (content_state->font.name)
    {
        if (odt_run_finish(alloc, content_state, content)) goto end;
    }
    if (odt_paragraph_finish(alloc, content)) goto end;

    e = 0;

    end:
    return e;
}

/* Write reference to image into odt content. */
static int
odt_append_image(extract_alloc_t   *alloc,
                 extract_astring_t *output,
                 image_t           *image)
{
    extract_astring_cat(alloc, output, "\n");
    extract_astring_cat(alloc, output, "<text:p text:style-name=\"Standard\">\n");
    extract_astring_catf(alloc, output, "<draw:frame draw:style-name=\"fr1\" draw:name=\"Picture %s\" text:anchor-type=\"as-char\" svg:width=\"%fin\" svg:height=\"%fin\" draw:z-index=\"0\">\n",
                         image->id,
                         image->w / 72.0,
                         image->h / 72.0);
    extract_astring_catf(alloc, output, "<draw:image xlink:href=\"Pictures/%s\" xlink:type=\"simple\" xlink:show=\"embed\" xlink:actuate=\"onLoad\" draw:mime-type=\"image/%s\"/>\n",
            image->name,
            image->type);
    extract_astring_cat(alloc, output, "</draw:frame>\n");
    extract_astring_cat(alloc, output, "</text:p>\n");

    return 0;
}


/* Writes paragraph to content inside rotated text box. */
static int
odt_output_rotated_paragraphs(extract_alloc_t      *alloc,
                              block_t              *block,
                              double                rotation_rad,
                              double                x_pt,
                              double                y_pt,
                              double                w_pt,
                              double                h_pt,
                              int                   text_box_id,
                              extract_astring_t    *content,
                              extract_odt_styles_t *styles,
                              content_state_t      *content_state)
{
    int                          e = 0;
    paragraph_t                *paragraph;
    content_paragraph_iterator  pit;
    double                      pt_to_inch = 1/72.0;

    outf("rotated paragraphs: rotation_rad=%f (x y)=(%f %f) (w h)=(%f %f)", rotation_rad, x_pt, y_pt, w_pt, h_pt);

    // https://docs.oasis-open.org/office/OpenDocument/v1.3/cs02/part3-schema/OpenDocument-v1.3-cs02-part3-schema.html#attribute-draw_transform
    // says rotation is in degrees, but we seem to require -radians.
    //

    if (!e) e = extract_astring_cat(alloc, content, "\n");

    if (!e) e = extract_astring_cat(alloc, content, "<text:p text:style-name=\"Standard\">\n");
    if (!e) e = extract_astring_catf(alloc, content, "<draw:frame"
            " text:anchor-type=\"paragraph\""
            " draw:z-index=\"5\""
            " draw:name=\"Shape%i\""
            " draw:style-name=\"gr1\""
            " draw:text-style-name=\"Standard\""
            " svg:width=\"%fin\""
            " svg:height=\"%fin\""
            " draw:transform=\"rotate (%f) translate (%fin %fin)\""
            ">\n"
            ,
            text_box_id,
            w_pt * pt_to_inch,
            h_pt * pt_to_inch,
            -rotation_rad,
            x_pt * pt_to_inch,
            y_pt * pt_to_inch
            );
    if (!e) e = extract_astring_cat(alloc, content, "<draw:text-box>\n");

    for (paragraph = content_paragraph_iterator_init(&pit, &block->content); paragraph != NULL; paragraph = content_paragraph_iterator_next(&pit))
        if (!e) e = document_to_odt_content_paragraph(alloc, content_state, paragraph, content, styles);

    if (!e) e = extract_astring_cat(alloc, content, "\n");
    if (!e) e = extract_astring_cat(alloc, content, "</draw:text-box>\n");
    if (!e) e = extract_astring_cat(alloc, content, "</draw:frame>\n");

    if (!e) e = extract_astring_cat(alloc, content, "</text:p>\n");

    return e;
}


static int
odt_append_table(extract_alloc_t      *alloc,
                 table_t              *table,
                 extract_astring_t    *output,
                 extract_odt_styles_t *styles)
{
    int e = -1;
    int y;

    {
        int x;
        static int table_number = 0;
        table_number += 1;
        if (extract_astring_catf(alloc, output,
                "\n"
                "    <table:table text:style-name=\"extract.table\" table:name=\"extract.table.%i\">\n"
                "        <table:table-columns>\n"
                ,
                table_number
                )) goto end;

        for (x=0; x<table->cells_num_x; ++x)
        {
            if (extract_astring_cat(alloc, output,
                    "            <table:table-column table:style-name=\"extract.table.column\"/>\n"
                    )) goto end;
        }
        if (extract_astring_cat(alloc, output,
                "        </table:table-columns>\n"
                )) goto end;
  }
  for (y=0; y<table->cells_num_y; ++y)
    {
        int x;
        if (extract_astring_cat(alloc, output,
                "        <table:table-row>\n"
                )) goto end;

        for (x=0; x<table->cells_num_x; ++x)
        {
            cell_t                     *cell = table->cells[y*table->cells_num_x + x];
            content_paragraph_iterator  pit;
            paragraph_t                *paragraph;
            content_state_t             content_state;

            if (!cell->above || !cell->left)
            {
                if (extract_astring_cat(alloc, output, "            <table:covered-table-cell/>\n")) goto end;
                continue;
            }

            if (extract_astring_cat(alloc, output, "            <table:table-cell")) goto end;
            if (cell->extend_right > 1)
            {
                if (extract_astring_catf(alloc, output, " table:number-columns-spanned=\"%i\"", cell->extend_right)) goto end;
            }
            if (cell->extend_down > 1)
            {
                if (extract_astring_catf(alloc, output, " table:number-rows-spanned=\"%i\"", cell->extend_down)) goto end;
            }
            if (extract_astring_catf(alloc, output, ">\n")) goto end;

            /* Write contents of this cell. */
            content_state.font.name = NULL;
            content_state.ctm_prev = NULL;
            for (paragraph = content_paragraph_iterator_init(&pit, &cell->content); paragraph != NULL; paragraph = content_paragraph_iterator_next(&pit))
                if (document_to_odt_content_paragraph(alloc, &content_state, paragraph, output, styles)) goto end;
            if (content_state.font.name)
                if (odt_run_finish(alloc, &content_state, output)) goto end;
            if (extract_astring_cat(alloc, output, "\n")) goto end;
            if (extract_astring_cat(alloc, output, "            </table:table-cell>\n")) goto end;
        }
        if (extract_astring_cat(alloc, output, "        </table:table-row>\n")) goto end;
    }
    if (extract_astring_cat(alloc, output, "    </table:table>\n")) goto end;
    e = 0;

    end:
    return e;
}


/* Appends paragraphs with same rotation, starting with subpage->paragraphs[*p]
and updates *p. */
static int
odt_append_rotated_paragraphs(extract_alloc_t       *alloc,
                              content_state_t       *content_state,
                              block_t               *block,
                              int                   *text_box_id,
                              const matrix4_t       *ctm,
                              double                 rotate,
                              extract_astring_t     *output,
                              extract_odt_styles_t  *styles)
{
    /* Find extent of paragraphs with this same rotation. extent
    will contain max width and max height of paragraphs, in units
    before application of ctm, i.e. before rotation. */
    int               e           = -1;
    point_t           extent      = {0, 0};
    content_iterator  cit;
    content_t        *content;
    paragraph_t      *paragraph   = content_first_paragraph(&block->content);

    /* We assume that first span is at origin of text
     * block. This assumes left-to-right text. */
    span_t           *first_span  = content_first_span(&content_first_line(&paragraph->content)->content);
    point_t           origin      = { first_span->chars[0].x,
                                     first_span->chars[0].y };
    matrix_t          ctm_inverse = {1, 0, 0, 1, 0, 0};
    double            ctm_det     = ctm->a*ctm->d - ctm->b*ctm->c;

    outf("rotate=%.2frad=%.1fdeg ctm: origin=(%f %f) abcd=(%f %f %f %f)",
         rotate, rotate * 180 / pi,
         origin.x,
         origin.y,
         ctm->a,
         ctm->b,
         ctm->c,
         ctm->d
         );

    if (ctm_det != 0)
    {
        ctm_inverse.a = +ctm->d / ctm_det;
        ctm_inverse.b = -ctm->b / ctm_det;
        ctm_inverse.c = -ctm->c / ctm_det;
        ctm_inverse.d = +ctm->a / ctm_det;
    }
    else
    {
        outf("cannot invert ctm=(%f %f %f %f)",
             ctm->a, ctm->b, ctm->c, ctm->d);
    }

    for (content = content_iterator_init(&cit, &block->content); content != NULL; content = content_iterator_next(&cit))
    {
        content_line_iterator  lit;
        line_t                *line;
        paragraph_t           *paragraph;

        assert(content->type == content_paragraph);
        if (content->type != content_paragraph)
            continue; /* This shouldn't happen for now! */

        paragraph = (paragraph_t *)content;

        /* Update <extent>. */
        for (line = content_line_iterator_init(&lit, &paragraph->content); line != NULL; line = content_line_iterator_next(&lit))
        {
            span_t *span = extract_line_span_last(line);
            char_t *char_ = extract_span_char_last(span);
            double  adv = char_->adv * extract_font_size(&span->ctm);
            double  x = char_->x + adv * cos(rotate);
            double  y = char_->y + adv * sin(rotate);

            double  dx = x - origin.x;
            double  dy = y - origin.y;

            /* Position relative to origin and before box rotation. */
            double  xx = ctm_inverse.a * dx + ctm_inverse.b * dy;
            double  yy = ctm_inverse.c * dx + ctm_inverse.d * dy;
            yy = -yy;
            if (xx > extent.x) extent.x = xx;
            if (yy > extent.y) extent.y = yy;
            if (0) outf("rotate=%f origin=(%f %f) xy=(%f %f) dxy=(%f %f) xxyy=(%f %f) span: %s",
                        rotate, origin.x, origin.y, x, y, dx, dy, xx, yy, extract_span_string(alloc, span));
        }
    }
    outf("rotate=%f extent is: (%f %f)",
         rotate, extent.x, extent.y);

    /* All the paragraphs have same rotation. We output them into
     * a single rotated text box. */

    /* We need unique id for text box. */
    *text_box_id += 1;

    if (odt_output_rotated_paragraphs(alloc,
                                      block,
                                      rotate,
                                      origin.x,
                                      origin.y,
                                      extent.x,
                                      extent.y,
                                      *text_box_id,
                                      output,
                                      styles,
                                      content_state)) goto end;

    e = 0;
end:

    return e;
}


static int
extract_page_to_odt_content(extract_alloc_t      *alloc,
                            extract_page_t       *page,
                            int                   spacing,
                            int                   rotation,
                            int                   images,
                            extract_astring_t    *output,
                            extract_odt_styles_t *styles)
{
    int ret = -1;
    int text_box_id = 0;
    int c;

    /* Write paragraphs into <content>. */
    for (c=0; c<page->subpages_num; ++c)
    {
        subpage_t                  *subpage = page->subpages[c];
        content_iterator            cit;
        content_t                  *content;
        content_table_iterator      tit;
        table_t                    *table;
        content_state_t content_state;
        content_state.font.name = NULL;
        content_state.font.size = 0;
        content_state.font.bold = 0;
        content_state.font.italic = 0;
        content_state.ctm_prev = NULL;

        content = content_iterator_init(&cit, &subpage->content);
        table = content_table_iterator_init(&tit, &subpage->tables);
        while (1)
        {
            double y_paragraph;
            double y_table;
            block_t *block = (content && content->type == content_block) ? (block_t *)content : NULL;
            paragraph_t *paragraph = (content && content->type == content_paragraph) ? (paragraph_t *)content : (block ? content_first_paragraph(&block->content) : NULL);
            line_t *first_line = paragraph ? content_first_line(&paragraph->content) : NULL;
            span_t *first_span = first_line ? content_first_span(&first_line->content) : NULL;
            if (!paragraph && !table)   break;
            y_paragraph = (paragraph) ? first_span->chars[0].y : DBL_MAX;
            y_table = (table) ? table->pos.y : DBL_MAX;

            if (paragraph && y_paragraph < y_table)
            {
                const matrix4_t *ctm = &first_span->ctm;
                double           rotate = atan2(ctm->b, ctm->a);

                if (spacing
                        && content_state.ctm_prev
                        && first_span
                        && extract_matrix4_cmp(content_state.ctm_prev,
                                               &first_span->ctm)
                        )
                {
                    /* Extra vertical space between paragraphs that were at
                    different angles in the original document. */
                    if (odt_append_empty_paragraph(alloc, output, styles)) goto end;
                }

                if (spacing)
                {
                    /* Extra vertical space between paragraphs. */
                    if (odt_append_empty_paragraph(alloc, output, styles)) goto end;
                }

                if (rotation && rotate != 0)
                {
                    assert(block);
                    if (odt_append_rotated_paragraphs(alloc, &content_state, block, &text_box_id, ctm, rotate, output, styles)) goto end;
                }
                else if (block)
                {
                    content_paragraph_iterator pit;
                    int                        first = 1;

                    for (paragraph = content_paragraph_iterator_init(&pit, &block->content); paragraph != NULL; paragraph = content_paragraph_iterator_next(&pit))
                    {
                        if (spacing && !first)
                        {
                            /* Extra vertical space between paragraphs. */
                            if (odt_append_empty_paragraph(alloc, output, styles)) goto end;
                        }
                        first = 0;

                        if (document_to_odt_content_paragraph(alloc, &content_state, paragraph, output, styles)) goto end;
                    }
                }
                else
                {
                    if (document_to_odt_content_paragraph(alloc, &content_state, paragraph, output, styles)) goto end;
                }
                content = content_iterator_next(&cit);
            }
            else if (table)
            {
                if (odt_append_table(alloc, table, output, styles)) goto end;
                table = content_table_iterator_next(&tit);
            }
        }

        outf("images=%i", images);
        if (images)
        {
            content_t *images, *next;
            outf("subpage->images_num=%i", content_count_images(&subpage->content));
            for (images = subpage->content.next; images != &subpage->content; images = next)
            {
                image_t *image = (image_t *)images;
                next = images->next;
                if (images->type != content_image)
                    continue;
                odt_append_image(alloc, output, image);
            }
        }
    }
    ret = 0;

    end:

    return ret;
}

int
extract_document_to_odt_content(extract_alloc_t      *alloc,
                                document_t           *document,
                                int                   spacing,
                                int                   rotation,
                                int                   images,
                                extract_astring_t    *content,
                                extract_odt_styles_t *styles)
{
    int p;
    int ret = 0;

    /* Write paragraphs into <content>. */
    for (p=0; p<document->pages_num; ++p)
    {
        extract_page_t *page = document->pages[p];

        ret = extract_page_to_odt_content(alloc,
                                          page,
                                          spacing,
                                          rotation,
                                          images,
                                          content,
                                          styles);
        if (ret) break;
    };

    return ret;
}

int
extract_odt_content_item(extract_alloc_t      *alloc,
                         extract_astring_t    *contentss,
                         int                   contentss_num,
                         extract_odt_styles_t *styles,
                         images_t             *images,
                         const char           *name,
                         const char           *text,
                         char                **text2)
{
    int e = -1;
    extract_astring_t   temp;
    extract_astring_init(&temp);
    *text2 = NULL;

    (void) images;
    if (0)
    {}
    else if (!strcmp(name, "content.xml"))
    {
        /* Insert paragraphs content. */
        char* text_intermediate = NULL;
        extract_astring_t   styles_definitions = {0};

        /* Insert content before '</office:text>'. */
        if (extract_content_insert(
                alloc,
                text,
                NULL /*single*/,
                NULL /*mid_begin_name*/,
                "</office:text>" /*mid_end_name*/,
                contentss,
                contentss_num,
                &text_intermediate
                )) goto end;
        outf("text_intermediate: %s", text_intermediate);

        /* Convert <styles> to text. */
        if (odt_styles_definitions(alloc, styles, &styles_definitions)) goto end;

        /* To make tables work, we seem to need to specify table and column
        styles, and these can be empty. todo: maybe specify exact sizes based
        on the pdf table and cell dimensions. */
        if (extract_astring_cat(alloc, &styles_definitions,
                "\n"
                "<style:style style:name=\"extract.table\" style:family=\"table\"/>\n"
                "<style:style style:name=\"extract.table.column\" style:family=\"table-column\"/>\n"
                )) goto end;

        /* Replace '<office:automatic-styles/>' with text from
        <styles_definitions>. */
        e = extract_content_insert(
                alloc,
                text_intermediate,
                "<office:automatic-styles/>" /*single*/,
                NULL /*mid_begin_name*/,
                NULL /*mid_end_name*/,
                &styles_definitions,
                1,
                text2
                );
        outf("e=%i errno=%i", e, errno);
        extract_free(alloc, &text_intermediate);
        extract_astring_free(alloc, &styles_definitions);
        outf("e=%i errno=%i", e, errno);
        if (e) goto end;
    }
    else if (!strcmp(name, "META-INF/manifest.xml"))
    {
        /* Add images. */
        int e = 0;
        int i;
        for (i=0; i<images->images_num; ++i)
        {
            image_t* image = images->images[i];
            if (!e) e = extract_astring_catf(alloc, &temp, "<manifest:file-entry manifest:full-path=\"Pictures/%s\" manifest:media-type=\"image/%s\"/>\n",
                    image->name,
                    image->type
                    );
        }
        if (!e) e = extract_content_insert(
                alloc,
                text,
                NULL /*single*/,
                NULL /*mid_begin_name*/,
                "</manifest:manifest>" /*mid_end_name*/,
                &temp,
                1,
                text2
                );
        if (e) goto end;
    }
    else
    {
        *text2 = NULL;
    }
    e = 0;
    end:
    outf("e=%i errno=%i text2=%s", e, errno, text2 ? *text2 : "");
    if (e)
    {
        /* We might have set <text2> to new content. */
        extract_free(alloc, text2);
        /* We might have used <temp> as a temporary buffer. */
    }
    extract_astring_free(alloc, &temp);
    extract_astring_init(&temp);
    return e;
}



int
extract_odt_write_template(extract_alloc_t      *alloc,
                           extract_astring_t    *contentss,
                           int                   contentss_num,
                           extract_odt_styles_t *styles,
                           images_t             *images,
                           const char           *path_template,
                           const char           *path_out,
                           int                   preserve_dir)
{
    int     e = -1;
    int     i;
    char*   path_tempdir = NULL;
    char*   path = NULL;
    char*   text = NULL;
    char*   text2 = NULL;

    assert(path_out);
    assert(path_template);

    if (extract_check_path_shell_safe(path_out))
    {
        outf("path_out is unsafe: %s", path_out);
        goto end;
    }

    outf("images->images_num=%i", images->images_num);
    if (extract_asprintf(alloc, &path_tempdir, "%s.dir", path_out) < 0) goto end;
    if (extract_systemf(alloc, "rm -r '%s' 2>/dev/null", path_tempdir) < 0) goto end;

    if (extract_mkdir(path_tempdir, 0777))
    {
        outf("Failed to create directory: %s", path_tempdir);
        goto end;
    }

    outf("Unzipping template document '%s' to tempdir: %s",
            path_template, path_tempdir);
    if (extract_systemf(alloc, "unzip -q -d '%s' '%s'", path_tempdir, path_template))
    {
        outf("Failed to unzip %s into %s",
                path_template, path_tempdir);
        goto end;
    }

    /* Might be nice to iterate through all items in path_tempdir, but for now
    we look at just the items that we know extract_odt_content_item() will
    modify. */

    {
        const char *names[] =
        {
                "content.xml",
                "META-INF/manifest.xml",
        };
        int names_num = sizeof(names) / sizeof(names[0]);
        for (i=0; i<names_num; ++i)
        {
            const char* name = names[i];
            extract_free(alloc, &path);
            extract_free(alloc, &text);
            extract_free(alloc, &text2);
            if (extract_asprintf(alloc, &path, "%s/%s", path_tempdir, name) < 0) goto end;
            if (extract_read_all_path(alloc, path, &text)) goto end;

            outf("before extract_odt_content_item() styles->styles_num=%i", styles->styles_num);
            if (extract_odt_content_item(
                    alloc,
                    contentss,
                    contentss_num,
                    styles,
                    images,
                    name,
                    text,
                    &text2
                    ))
            {
                outf("extract_odt_content_item() failed");
                goto end;
            }

            outf("after extract_odt_content_item styles->styles_num=%i", styles->styles_num);

            {
                const char* text3 = (text2) ? text2 : text;
                if (extract_write_all(text3, strlen(text3), path)) goto end;
                outf("have written to path=%s", path);
            }
        }
    }

    /* Copy images into <path_tempdir>/Pictures/. */
    extract_free(alloc, &path);
    if (extract_asprintf(alloc, &path, "%s/Pictures", path_tempdir) < 0) goto end;
    if (extract_mkdir(path, 0777))
    {
        outf("Failed to mkdir %s", path);
        goto end;
    }
    for (i=0; i<images->images_num; ++i)
    {
        image_t* image = images->images[i];
        extract_free(alloc, &path);
        if (extract_asprintf(alloc, &path, "%s/Pictures/%s", path_tempdir, image->name) < 0) goto end;
        if (extract_write_all(image->data, image->data_size, path)) goto end;
    }

    outf("Zipping tempdir to create %s", path_out);
    {
        const char* path_out_leaf = strrchr(path_out, '/');
        if (!path_out_leaf) path_out_leaf = path_out;
        if (extract_systemf(alloc, "cd '%s' && zip -q -r -D '../%s' .", path_tempdir, path_out_leaf))
        {
            outf("Zip command failed to convert '%s' directory into output file: %s",
                    path_tempdir, path_out);
            goto end;
        }
    }

    if (!preserve_dir)
    {
        if (extract_remove_directory(alloc, path_tempdir)) goto end;
    }

    e = 0;

    end:
    outf("e=%i", e);
    extract_free(alloc, &path_tempdir);
    extract_free(alloc, &path);
    extract_free(alloc, &text);
    extract_free(alloc, &text2);

    if (e)
    {
        outf("Failed to create %s", path_out);
    }
    return e;
}
