"""Tenant configuration loading.

One process serves exactly one tenant, selected via the TENANT env var
(default "default"). The tenant folder lives in tenants/<id>/ and contains:

    tenant.json      branding, office info, feature flags, STT provider (data, not code)
                     incl. org_short/org_profile for the shared default prompt
    logo.svg|png     brand logo (web topbar + PDF header)
    prompt.txt       summary prompt          (optional — falls back to core default)
    protocol.html    PDF layout template     (optional — falls back to core default)
    protocol.css     PDF styling             (optional — falls back to core default)
    overrides.py     code hooks              (optional — see core/hooks.py)

Everything that differs per customer is *data* here. The core code never
changes per customer.
"""
from __future__ import annotations

import json
import os
from dataclasses import dataclass, field
from pathlib import Path

from core import bundle

ROOT = Path(__file__).resolve().parent.parent
# TENANTS_DIR (Env) nur für Tests/Entwicklung; Standard: eingebackene Tenants im Image
TENANTS_DIR = Path(os.getenv("TENANTS_DIR") or ROOT / "tenants")
CORE_DEFAULTS = ROOT / "core" / "defaults"
CORE_TEMPLATES = ROOT / "core" / "templates"

# Default theme — used for any colour a tenant does not override.
DEFAULT_COLORS = {
    "accent": "#327F24",
    "accent_dark": "#235A19",
    "accent_mid": "#3E9130",
    "accent_light": "#EAF4E7",
    "accent_xlight": "#F3FAF1",
    "bg": "#F1F5F0",
    "surface": "#FFFFFF",
    "surface2": "#F6FAF5",
    "border": "#DCE8D9",
    "border2": "#BDD1B8",
    "text": "#444444",
    "text_2": "#666666",
    "text_3": "#9AA89A",
    "red": "#DC2626",
    "progress_to": "#8bbf43",
}


@dataclass
class TenantConfig:
    id: str
    dir: Path
    name: str
    title: str
    description: str
    colors: dict
    office: dict
    flags: dict
    ai_detect_org: str
    org_short: str = ""
    org_profile: str = ""
    stt: dict = field(default_factory=dict)
    raw: dict = field(default_factory=dict)
    # Herkunft der Tenant-Daten (siehe core/bundle.py): {source: git|admin|cache|baked, version, stale, error}
    bundle: dict = field(default_factory=dict)

    # ── resolved file paths (tenant override → core default) ──
    def _pick(self, tenant_name: str, default_path: Path) -> Path:
        candidate = self.dir / tenant_name
        return candidate if candidate.exists() else default_path

    @property
    def prompt_path(self) -> Path:
        return self._pick("prompt.txt", CORE_DEFAULTS / "prompt.txt")

    @property
    def pdf_template_path(self) -> Path:
        return self._pick("protocol.html", CORE_TEMPLATES / "protocol.html")

    @property
    def pdf_css_path(self) -> Path:
        return self._pick("protocol.css", CORE_TEMPLATES / "protocol.css")

    @property
    def logo_path(self) -> Path | None:
        for name in ("logo.svg", "logo.png"):
            p = self.dir / name
            if p.exists():
                return p
        return None

    @property
    def docx_logo_path(self) -> Path | None:
        """Logo for the Word header — Word needs a raster image, no SVG.

        A tenant may ship both (logo.svg for web/PDF, logo.png next to it);
        this prefers the raster file where logo_path prefers the vector one.
        """
        for name in ("logo.png", "logo.jpg", "logo.jpeg", "logo.svg"):
            p = self.dir / name
            if p.exists():
                return p
        return None

    @property
    def favicon_path(self) -> Path | None:
        p = self.dir / "favicon.svg"
        return p if p.exists() else None

    def flag(self, key: str, default=None):
        return self.flags.get(key, default)


def load_tenant(tenant_id: str | None = None) -> TenantConfig:
    tenant_id = (tenant_id or os.getenv("TENANT", "default")).strip()
    tenant_dir, bundle_info = bundle.resolve(tenant_id, TENANTS_DIR)
    config_file = tenant_dir / "tenant.json"
    if not config_file.exists():
        raise RuntimeError(
            f"Tenant '{tenant_id}' nicht gefunden: {config_file} fehlt. "
            f"Verfügbar: {[p.name for p in TENANTS_DIR.iterdir() if p.is_dir()] if TENANTS_DIR.exists() else []}"
        )

    raw = json.loads(config_file.read_text(encoding="utf-8"))

    colors = {**DEFAULT_COLORS, **(raw.get("colors") or {})}
    name = raw.get("name", tenant_id)

    return TenantConfig(
        id=tenant_id,
        dir=tenant_dir,
        name=name,
        title=raw.get("title", f"{name} – Gesprächsprotokoll"),
        description=raw.get("description", f"Gesprächsprotokoll-Tool für {name}"),
        colors=colors,
        office=raw.get("office") or {},
        flags=raw.get("flags") or {},
        ai_detect_org=raw.get("ai_detect_org", name),
        # How the tenant refers to itself inside the protocol text ("revier",
        # "Onyva") and one optional sentence describing what it does — both are
        # substituted into the shared default prompt.
        org_short=raw.get("org_short", name),
        org_profile=raw.get("org_profile", ""),
        stt=raw.get("stt") or {},
        raw=raw,
        bundle=bundle_info,
    )


# Singleton for the running process (TENANT is fixed per instance).
CFG: TenantConfig = load_tenant()