#pragma once
// capture_paths — the REAPER-free path arithmetic behind offline capture. The
// capture shell resolves the current project directory via REAPER APIs, then
// hands the raw strings here. Forward-slash form throughout, no filesystem
// access; the bank subfolder name is a fixed constant.

#include <cstddef>
#include <cstdint>
#include <string>
#include <vector>

namespace reasampler::capture {

// The project-relative bank subfolder. All captured wavs live here so the bank
// travels with the .rpp.
inline constexpr const char* kBankSubfolder = "reasampler_bank";

// A resolved pair of paths for one capture: where REAPER must be told to write
// (absolute, because RENDER_FILE wants a directory REAPER can create/open) and
// what we store in the BankModel (project-relative, because the index is
// relative-paths-only — CLAUDE.md precision invariant).
struct BankPaths {
    std::string absoluteDir;    // <projectDir>/reasampler_bank  (forward slash)
    std::string relativePath;   // reasampler_bank/<fileName>    (index value)
    std::string fileName;       // <stem>.wav                    (full file name)
    std::string fileStem;       // <stem>                        (RENDER_PATTERN — REAPER appends the extension)
};

// Normalizes a path to forward slashes and strips any trailing slash (does not
// consult the filesystem). On Windows (_WIN32) also lowercases the result so
// paths differing only in casing compare equal; macOS/Linux preserve case.
std::string normalizeSlashes(const std::string& path);

// Sanitizes a caller-supplied base name into a filesystem-safe stem: keeps
// [A-Za-z0-9._-], replaces every other byte with '_', and collapses to
// "capture" if nothing usable remains. Deterministic.
std::string sanitizeStem(const std::string& baseName);

// Where one render writes, with no index spelling at all: the directory REAPER is
// told to render into plus the stem/file name it produces there. `absoluteDir` is
// taken as given (normalized only) rather than derived, because a render that never
// enters the bank has no bank subfolder to append — the render-in-place verb points
// this at the project's own recording path.
struct RenderPaths {
    std::string absoluteDir;   // RENDER_FILE   (forward slash, no trailing slash)
    std::string fileName;      // <stem>.wav
    std::string fileStem;      // <stem>        (RENDER_PATTERN — REAPER appends the extension)
};

// The file-stem spelling for one render: baseName is the sanitized file-stem source,
// uniqueTag an optional sanitized disambiguator (timestamp/counter) so repeated
// renders don't collide. Produces "<stem>[_<tag>].wav". THE one owner of that
// spelling — deriveBankPaths is expressed over it, and bankRelativeForName depends
// on the bank's spelling never drifting from it.
RenderPaths deriveRenderPaths(const std::string& absoluteDir,
                              const std::string& baseName,
                              const std::string& uniqueTag);

// Derives the bank paths for one capture: the same stem spelling as
// deriveRenderPaths, in the bank subfolder, plus the project-relative path the
// index stores.
BankPaths deriveBankPaths(const std::string& projectDir,
                          const std::string& baseName,
                          const std::string& uniqueTag);

// The project-relative index spelling for a bank file known only by its file
// name (bare entry, no directory) — the prune shell uses this to spell an
// enumerated folder entry the SAME way deriveBankPaths spelled it at capture
// time; a divergence here could make a referenced file look like an orphan.
std::string bankRelativeForName(const std::string& fileName);

// --- Persist-side path arithmetic -------------------------------------------
//
// The index stores relative paths only; on project load the persist shell
// turns each relativePath back into an absolute path against the current
// project directory — the inverse of deriveBankPaths.

// Returns "<projectDir>/<relativePath>" forward-slashed, or empty if either
// input is empty (no default-location fallback — an unsaved/unset project
// fails loudly rather than resolving against CWD).
std::string resolveBankFile(const std::string& projectDir,
                            const std::string& relativePath);

// The project directory that holds a .rpp: parent directory, forward-slashed,
// trailing slash stripped. Empty in -> empty out (an unsaved project reports
// an empty .rpp path). Pure so the VST3 instrument resolves audio paths the
// same way persist does.
std::string projectDirOfRpp(const std::string& rppPath);

// A relocation plan for the physical bank folder on Save-As to a new project
// location. The index's relative paths do NOT change (they are relative to the
// project dir, which moved with the .rpp), so relocation is purely a folder
// move. Both dirs are absolute, forward-slashed, trailing-slash-stripped.
struct BankRelocation {
    std::string oldBankDir;  // <oldProjectDir>/reasampler_bank
    std::string newBankDir;  // <newProjectDir>/reasampler_bank
    bool        needed = false;  // false when old==new (Save in place, not Save-As)
};

// Derives the relocation plan: `needed` is true iff the normalized old/new
// project dirs differ (a genuine Save-As-to-new-dir); empty dirs/needed=false
// when either input is empty.
BankRelocation deriveRelocationPlan(const std::string& oldProjectDir,
                                    const std::string& newProjectDir);

// --- Project-identity transition ---------------------------------------------
//
// What the persist timer must do on each tick. GUID is checked FIRST because
// two prior pointer-primary/GUID-only designs each broke a real case: a
// GUID-only check misreads a Save-As fork as the same project (fork and
// parent share a GUID on disk); a pointer-primary check misreads REAPER
// recycling a closed project's ReaProject* address onto an unrelated project
// (a different project, same recycled pointer, read as NoOp/SaveAsRelocate —
// the bank never reloads). Checking GUID first catches recycling; the pointer
// (sameProjectObject) then separates a forked sibling (Load) from a genuine
// Save-As (SaveAsRelocate).
enum class ProjectTransition {
    NoOp,             // same object, same GUID, same location — nothing to do
    Load,             // a different project is active — load ITS index from ext state
    SaveAsRelocate,   // SAME object + SAME GUID, new .rpp location — relocate the bank
};

// Classifies what a poll tick observed. sameProjectObject is passed as a bool
// (not the raw pointer) to keep the classifier REAPER-free and testable;
// lastGuid/lastPath is the project persist last acted on, currentGuid/
// currentPath the now-active project (both "" if unsaved/unwritten).
// Evaluated in order: currentGuid!=lastGuid -> Load; !sameProjectObject ->
// Load (forked sibling); currentPath!=lastPath -> SaveAsRelocate (also covers
// first save of an unsaved project); else NoOp.
ProjectTransition classifyProjectTransition(bool sameProjectObject,
                                            const std::string& lastGuid,
                                            const std::string& lastPath,
                                            const std::string& currentGuid,
                                            const std::string& currentPath);

} // namespace reasampler::capture
