//! Import specifier resolution using `oxc_resolver`.
//!
//! Orchestrates the resolution pipeline: for every extracted module, resolves all
//! import specifiers in parallel (via rayon) to an [`ResolveResult`] — internal file,
//! npm package, external file, or unresolvable. The entry point is [`resolve_all_imports`].
//!
//! Resolution is split into submodules by import kind:
//! - `static_imports` — ES `import` declarations
//! - `dynamic_imports` — `import()` expressions and glob-based dynamic patterns
//! - `require_imports` — CommonJS `require()` calls
//! - `re_exports` — `export { x } from './y'` re-export sources
//! - `upgrades` — post-resolution pass fixing non-deterministic bare specifier results
//!
//! Handles tsconfig path aliases (auto-discovered per file), pnpm virtual store paths,
//! React Native platform extensions, and package.json `exports` subpath resolution with
//! output-to-source directory fallback.

mod dynamic_imports;
pub(crate) mod fallbacks;
mod path_info;
mod re_exports;
mod react_native;
mod require_imports;
mod specifier;
mod static_imports;
#[cfg(test)]
mod tests;
mod types;
mod upgrades;

pub use fallbacks::extract_package_name_from_node_modules_path;
pub use path_info::{
    extract_package_name, is_bare_specifier, is_path_alias, is_valid_package_name,
};
pub use types::{
    ResolveResult, ResolvedImport, ResolvedModule, ResolvedReExport, ResolvedSourceEdge,
};

use std::path::{Path, PathBuf};
use std::sync::Mutex;

use rayon::prelude::*;
use rustc_hash::{FxHashMap, FxHashSet};

use fallow_config::{AutoImportKind, AutoImportRule};
use fallow_types::discover::{DiscoveredFile, FileId};
use fallow_types::extract::{ImportInfo, ImportedName, ModuleInfo};
use oxc_span::Span;

use dynamic_imports::{resolve_dynamic_imports, resolve_dynamic_patterns};
use re_exports::resolve_re_exports;
use react_native::{build_condition_names, build_extensions};
use require_imports::resolve_require_imports;
use specifier::create_resolver;
use static_imports::resolve_static_imports;
use types::{PackageManifestInfo, ResolveContext};
use upgrades::apply_specifier_upgrades;

/// Resolve all imports across all modules in parallel.
#[must_use]
#[expect(
    clippy::too_many_arguments,
    reason = "resolver inputs come from disjoint sources (config, plugins, workspace, filesystem); \
              bundling them into a struct would be a cross-cutting refactor outside this task"
)]
pub fn resolve_all_imports(
    modules: &[ModuleInfo],
    files: &[DiscoveredFile],
    workspaces: &[fallow_config::WorkspaceInfo],
    active_plugins: &[String],
    path_aliases: &[(String, String)],
    auto_imports: &[AutoImportRule],
    scss_include_paths: &[PathBuf],
    static_dir_mappings: &[(PathBuf, String)],
    root: &Path,
    extra_conditions: &[String],
) -> Vec<ResolvedModule> {
    let canonical_ws_roots: Vec<PathBuf> = workspaces
        .par_iter()
        .map(|ws| dunce::canonicalize(&ws.root).unwrap_or_else(|_| ws.root.clone()))
        .collect();
    let workspace_roots: FxHashMap<&str, &Path> = workspaces
        .iter()
        .zip(canonical_ws_roots.iter())
        .map(|(ws, canonical)| (ws.name.as_str(), canonical.as_path()))
        .collect();
    let root_canonical = dunce::canonicalize(root).unwrap_or_else(|_| root.to_path_buf());
    let mut package_manifests = Vec::new();
    if let Ok(package_json) = fallow_config::PackageJson::load(&root.join("package.json")) {
        package_manifests.push(PackageManifestInfo {
            root: root.to_path_buf(),
            canonical_root: root_canonical,
            name: package_json.name.clone(),
            package_json,
        });
    }
    for (ws, canonical_root) in workspaces.iter().zip(canonical_ws_roots.iter()) {
        if let Ok(package_json) = fallow_config::PackageJson::load(&ws.root.join("package.json")) {
            package_manifests.push(PackageManifestInfo {
                root: ws.root.clone(),
                canonical_root: canonical_root.clone(),
                name: package_json.name.clone().or_else(|| Some(ws.name.clone())),
                package_json,
            });
        }
    }

    let root_is_canonical = dunce::canonicalize(root).is_ok_and(|c| c == root);

    let canonical_paths: Vec<PathBuf> = if root_is_canonical {
        Vec::new()
    } else {
        files
            .par_iter()
            .map(|f| dunce::canonicalize(&f.path).unwrap_or_else(|_| f.path.clone()))
            .collect()
    };

    let path_to_id: FxHashMap<&Path, FileId> = if root_is_canonical {
        files.iter().map(|f| (f.path.as_path(), f.id)).collect()
    } else {
        canonical_paths
            .iter()
            .enumerate()
            .map(|(idx, canonical)| (canonical.as_path(), files[idx].id))
            .collect()
    };

    let raw_path_to_id: FxHashMap<&Path, FileId> =
        files.iter().map(|f| (f.path.as_path(), f.id)).collect();

    let file_paths: Vec<&Path> = files.iter().map(|f| f.path.as_path()).collect();

    let extensions = build_extensions(active_plugins);
    let condition_names = build_condition_names(active_plugins, extra_conditions);
    let resolver = create_resolver(active_plugins, extra_conditions);
    let mut style_conditions = extra_conditions.to_vec();
    style_conditions.push("sass".to_string());
    style_conditions.push("style".to_string());
    let style_resolver = create_resolver(active_plugins, &style_conditions);

    let canonical_fallback = if root_is_canonical {
        Some(types::CanonicalFallback::new(files))
    } else {
        None
    };

    let tsconfig_warned: Mutex<FxHashSet<String>> = Mutex::new(FxHashSet::default());

    let ctx = ResolveContext {
        resolver: &resolver,
        style_resolver: &style_resolver,
        extensions: &extensions,
        path_to_id: &path_to_id,
        raw_path_to_id: &raw_path_to_id,
        workspace_roots: &workspace_roots,
        package_manifests: &package_manifests,
        condition_names: &condition_names,
        path_aliases,
        scss_include_paths,
        static_dir_mappings,
        root,
        canonical_fallback: canonical_fallback.as_ref(),
        tsconfig_warned: &tsconfig_warned,
    };

    let mut resolved: Vec<ResolvedModule> = modules
        .par_iter()
        .filter_map(|module| {
            let Some(file_path) = file_paths.get(module.file_id.0 as usize) else {
                tracing::warn!(
                    file_id = module.file_id.0,
                    "Skipping module with unknown file_id during resolution"
                );
                return None;
            };

            let mut all_imports = resolve_static_imports(&ctx, file_path, &module.imports);
            all_imports.extend(resolve_require_imports(
                &ctx,
                file_path,
                &module.require_calls,
            ));

            let from_dir = if canonical_paths.is_empty() {
                file_path.parent().unwrap_or(file_path)
            } else {
                canonical_paths
                    .get(module.file_id.0 as usize)
                    .and_then(|p| p.parent())
                    .unwrap_or(file_path)
            };

            Some(ResolvedModule {
                file_id: module.file_id,
                path: file_path.to_path_buf(),
                exports: module.exports.clone(),
                re_exports: resolve_re_exports(&ctx, file_path, &module.re_exports),
                resolved_imports: all_imports,
                resolved_dynamic_imports: resolve_dynamic_imports(
                    &ctx,
                    file_path,
                    &module.dynamic_imports,
                ),
                resolved_dynamic_patterns: resolve_dynamic_patterns(
                    from_dir,
                    &module.dynamic_import_patterns,
                    &canonical_paths,
                    files,
                ),
                member_accesses: module.member_accesses.clone(),
                whole_object_uses: module.whole_object_uses.clone(),
                has_cjs_exports: module.has_cjs_exports,
                has_angular_component_template_url: module.has_angular_component_template_url,
                unused_import_bindings: module.unused_import_bindings.iter().cloned().collect(),
                type_referenced_import_bindings: module.type_referenced_import_bindings.clone(),
                value_referenced_import_bindings: module.value_referenced_import_bindings.clone(),
                namespace_object_aliases: module.namespace_object_aliases.clone(),
            })
        })
        .collect();

    apply_specifier_upgrades(&mut resolved);

    synthesize_auto_import_edges(
        &mut resolved,
        modules,
        auto_imports,
        &path_to_id,
        &raw_path_to_id,
    );

    resolved
}

/// Synthesize module-graph edges for convention auto-imports.
///
/// For each module, every captured `auto_import_candidates` name is matched
/// against the active plugins' auto-import table; on a hit a synthetic
/// [`ResolvedImport`] is added so the existing graph builder credits the edge.
/// Name collisions across files over-credit every match, keeping each provider
/// reachable. Resolution is recomputed from the live file index each run.
fn synthesize_auto_import_edges(
    resolved: &mut [ResolvedModule],
    modules: &[ModuleInfo],
    auto_imports: &[AutoImportRule],
    path_to_id: &FxHashMap<&Path, FileId>,
    raw_path_to_id: &FxHashMap<&Path, FileId>,
) {
    if auto_imports.is_empty() {
        return;
    }

    let mut table: FxHashMap<&str, Vec<(FileId, AutoImportKind)>> = FxHashMap::default();
    for rule in auto_imports {
        let source = rule.source.as_path();
        let Some(file_id) = raw_path_to_id
            .get(source)
            .or_else(|| path_to_id.get(source))
            .copied()
        else {
            continue;
        };
        table
            .entry(rule.name.as_str())
            .or_default()
            .push((file_id, rule.kind));
    }
    if table.is_empty() {
        return;
    }

    let candidates: FxHashMap<FileId, &[String]> = modules
        .iter()
        .filter(|module| !module.auto_import_candidates.is_empty())
        .map(|module| (module.file_id, module.auto_import_candidates.as_slice()))
        .collect();
    if candidates.is_empty() {
        return;
    }

    for module in resolved.iter_mut() {
        let Some(names) = candidates.get(&module.file_id) else {
            continue;
        };
        for name in *names {
            if is_auto_import_builtin(name) {
                continue;
            }
            let Some(targets) = table.get(name.as_str()) else {
                continue;
            };
            for (target_id, kind) in targets {
                if *target_id == module.file_id {
                    continue;
                }
                module.resolved_imports.push(ResolvedImport {
                    info: synthetic_auto_import_info(name, *kind),
                    target: ResolveResult::InternalModule(*target_id),
                });
            }
        }
    }
}

fn is_auto_import_builtin(name: &str) -> bool {
    matches!(
        name,
        "AbortController"
            | "AbortSignal"
            | "Array"
            | "ArrayBuffer"
            | "BigInt"
            | "Blob"
            | "Boolean"
            | "Buffer"
            | "CSS"
            | "DOMParser"
            | "Date"
            | "Document"
            | "Error"
            | "Event"
            | "EventTarget"
            | "File"
            | "FormData"
            | "Intl"
            | "JSON"
            | "Map"
            | "Math"
            | "Number"
            | "Object"
            | "Promise"
            | "Reflect"
            | "RegExp"
            | "Response"
            | "Set"
            | "String"
            | "Symbol"
            | "URL"
            | "URLSearchParams"
            | "WeakMap"
            | "WeakSet"
            | "Window"
            | "alert"
            | "clearInterval"
            | "clearTimeout"
            | "console"
            | "document"
            | "fetch"
            | "global"
            | "globalThis"
            | "localStorage"
            | "navigator"
            | "process"
            | "requestAnimationFrame"
            | "sessionStorage"
            | "setInterval"
            | "setTimeout"
            | "window"
            | "computed"
            | "customRef"
            | "defineAsyncComponent"
            | "defineComponent"
            | "effectScope"
            | "getCurrentInstance"
            | "h"
            | "inject"
            | "isProxy"
            | "isReactive"
            | "isReadonly"
            | "isRef"
            | "markRaw"
            | "nextTick"
            | "onActivated"
            | "onBeforeMount"
            | "onBeforeUnmount"
            | "onBeforeUpdate"
            | "onDeactivated"
            | "onErrorCaptured"
            | "onMounted"
            | "onRenderTracked"
            | "onRenderTriggered"
            | "onScopeDispose"
            | "onServerPrefetch"
            | "onUnmounted"
            | "onUpdated"
            | "provide"
            | "reactive"
            | "readonly"
            | "ref"
            | "resolveComponent"
            | "shallowReactive"
            | "shallowReadonly"
            | "shallowRef"
            | "toRaw"
            | "toRef"
            | "toRefs"
            | "triggerRef"
            | "unref"
            | "watch"
            | "watchEffect"
            | "watchPostEffect"
            | "watchSyncEffect"
            | "useAsyncData"
            | "useCookie"
            | "useError"
            | "useFetch"
            | "useHead"
            | "useLazyAsyncData"
            | "useLazyFetch"
            | "useNuxtApp"
            | "useRequestEvent"
            | "useRequestHeaders"
            | "useRoute"
            | "useRouter"
            | "useRuntimeConfig"
            | "useSeoMeta"
            | "useState"
    )
}

/// Build a synthetic [`ImportInfo`] for a convention auto-import. Component and
/// default kinds credit the default export; named kinds credit the named export.
fn synthetic_auto_import_info(name: &str, kind: AutoImportKind) -> ImportInfo {
    let imported_name = match kind {
        AutoImportKind::Named => ImportedName::Named(name.to_string()),
        AutoImportKind::Default | AutoImportKind::DefaultComponent => ImportedName::Default,
    };
    ImportInfo {
        source: format!("<auto-import:{name}>"),
        imported_name,
        local_name: name.to_string(),
        is_type_only: false,
        from_style: false,
        span: Span::default(),
        source_span: Span::default(),
    }
}
