#pragma once

// The Klammertext font store (infrastructure; see font_store.cpp).

#include <string>
#include "locator.h"
#include <vector>

struct Resolved_font {
    std::string family_name {};   // "Crimson Pro"
    std::string dir_name {};      // "crimson-pro"
    std::string font_dir {};      // Full path to font directory
    std::string css_file {};      // Full path to .css file
    // .ttf filenames for each variant (empty if variant not available):
    std::string regular {};
    std::string bold {};
    std::string italic {};
    std::string bold_italic {};
    float xheight_ratio = 0.0f;   // x-height / unitsPerEm from OS/2 table
    float capheight_ratio = 0.0f;  // cap-height / unitsPerEm from OS/2 table
};

std::string name_to_dirname(const std::string& name);
// Directories searched for installed fonts (KLAMMERTEXT_FONTS, default
// ~/.klammertext/fonts); the default font set is searched after them.
std::vector<std::string> installed_font_dirs();
// The distribution's default fonts: $KLAMMERTEXT_HOME/fnt.
std::string default_font_dir();
// Every installable font family found across those directories.
std::vector<std::string> available_font_families();
// Every font ONE base directory holds, in directory-name order: each
// <name>.css beside a <name>/ directory, the family name read from the css
// (the directory name when the css declares none), the styles classified.
// Empty for a directory that does not exist or holds no fonts; the caller
// asks the filesystem which.  The store's layout convention lives here, so
// a listing of the store (kdesc --typeface) reads it rather than restating it.
std::vector<Resolved_font> fonts_in_directory(const std::string& base);
// Whether the store can resolve NAME -- written as the family name or as
// the store's directory name, since both resolve.  The question a klammer
// asks before it names a typeface that is not shipped (a CJK face), so it
// can render the text plainly and say how to install the font instead of
// failing the document.  Never throws; resolve_font() is the error path.
bool font_installed(const std::string& name);
// The Locator is the DOCUMENT location to blame when the typeface is not
// installed: without it the "not installed" error cites font_store.cpp,
// a source location no user can act on (the no-.cpp-location rule).
Resolved_font resolve_font(const std::string& family_name,
                           const Locator& loc = Locator::none());
void install_resolved_font(const Resolved_font& font, std::string output_dir);

// One font file classified by its internal metadata (name table, OS/2).
struct Font_file {
    std::string path {};
    std::string family {};       // from name table (nameID 16, else 1)
    std::string variant {};      // Regular | Bold | Italic | BoldItalic
    std::string extension {};    // ".ttf" or ".otf"
    bool variable = false;       // has an 'fvar' table
    int weight = 0;              // OS/2 usWeightClass
    std::string note {};         // reason when the file is not installable
};

// Recursively classify every .ttf/.otf under a directory.
std::vector<Font_file> classify_font_files(const std::string& directory);

// Install the classified families from source_dir into dest_dir (default:
// the first KLAMMERTEXT_FONTS directory, created if necessary), in the
// canonical relocatable layout <dest>/<family-kebab>/{Variant}.ttf plus a
// generated <family-kebab>.css with relative urls.  Returns a report.
std::string install_fonts(const std::string& source_dir, std::string dest_dir = "");

// Write an HTML specimen page for fonts into output_dir.  With an empty
// source_dir, samples every available font in the store; otherwise
// classifies and samples the (possibly uninstalled) fonts in source_dir.
std::string write_font_samples(const std::string& output_dir, const std::string& source_dir = "");