"""Custom HTML components — Off-Brand UI built on top of `gr.HTML`.
Each component subclasses ``gr.HTML`` and ships its own ``html_template`` and
``css_template``. State is a Python dict; ``render(state)`` returns a complete
``<style>...</style><div>...</div>`` blob ready to drop into the page. Updates
flow through normal Gradio event callbacks — call ``Component.render(...)`` in
your handler and yield the new HTML string.
Pattern adapted from "Gradio HTML components.md": templates substitute
``${value.X}`` tokens against the state dict, every component bundles its own
CSS, and components are easy to compose because they're just `gr.HTML` under
the hood.
"""
from __future__ import annotations

import html
import json
import re
from pathlib import Path
from typing import Any, ClassVar

import gradio as gr


# ---------------------------------------------------------------------------
# Base class: TemplatedHTML
# ---------------------------------------------------------------------------
TOKEN_RE = re.compile(r"\$\{([^}]+)\}")


def _resolve(expr: str, scope: dict[str, Any]) -> Any:
    """Resolve ``value.steps[0].instruction``-style expressions against scope."""
    parts = re.split(r"\.|\[|\]", expr)
    parts = [p for p in parts if p != ""]
    cur: Any = scope
    for p in parts:
        if isinstance(cur, dict) and p in cur:
            cur = cur[p]
        elif isinstance(cur, list) and p.isdigit():
            cur = cur[int(p)]
        elif hasattr(cur, p):
            cur = getattr(cur, p)
        else:
            return ""
    return cur


def substitute(template: str, state: dict[str, Any]) -> str:
    scope = {"value": state}
    def _sub(m: re.Match) -> str:
        out = _resolve(m.group(1), scope)
        if out is None:
            return ""
        return html.escape(str(out)) if not isinstance(out, str) else html.escape(out)
    return TOKEN_RE.sub(_sub, template)


class TemplatedHTML(gr.HTML):
    """A gr.HTML wrapper that re-renders a template against a state dict."""

    html_template: ClassVar[str] = ""
    css_template: ClassVar[str] = ""

    def __init__(self, value: dict[str, Any] | None = None, **kwargs):
        self._state: dict[str, Any] = value or {}
        super().__init__(value=self.render(self._state), **kwargs)

    @classmethod
    def render(cls, state: dict[str, Any]) -> str:
        body = cls._render_body(state)
        return f"<style>{cls.css_template}</style>{body}"

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        # Default: simple ${value.X} substitution against the state dict.
        return substitute(cls.html_template, state)


# ---------------------------------------------------------------------------
# RecipeHero — title + final-dish image + summary line
# ---------------------------------------------------------------------------
class RecipeHero(TemplatedHTML):
    css_template = """
.cwm-hero {
  background: #fffbf0 !important;
  border: 1px solid #d8c9ad;
  border-radius: 16px;
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  box-shadow: 0 10px 28px rgba(107, 74, 42, 0.10);
}
.cwm-hero img {
  width: 100%; height: 320px; object-fit: cover; border-radius: 12px;
  background: #efe3c8;
}
.cwm-hero h1 {
  font-family: 'Lora', serif; font-size: 38px; color: #6b4a2a !important;
  margin: 0 0 8px;
}
.cwm-hero .meta {
  color: #8a6a3a !important; font-size: 14px; letter-spacing: 0.04em;
  text-transform: uppercase; margin-bottom: 18px;
}
.cwm-hero .visual {
  font-family: 'Lora', serif; font-style: italic; color: #6b4a2a !important;
  font-size: 17px; line-height: 1.55;
}
@media (max-width: 720px) { .cwm-hero { grid-template-columns: 1fr; } }
"""

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        name = html.escape(state.get("name") or "Pick a dish to get started")
        cuisine = html.escape(state.get("cuisine") or "")
        servings = state.get("servings") or 0
        time = state.get("total_time_minutes") or 0
        visual = html.escape(state.get("final_dish_visual") or "")
        img_b64 = state.get("final_dish_image_b64") or ""
        img_path = state.get("final_dish_image_path") or ""
        if img_b64:
            img_tag = f'<img src="data:image/png;base64,{img_b64}" alt="final dish"/>'
        elif img_path:
            img_tag = f'<img src="/file={html.escape(img_path)}" alt="final dish"/>'
        else:
            img_tag = '<div style="background:#efe3c8;border-radius:12px;height:320px;display:flex;align-items:center;justify-content:center;color:#8a6a3a;font-family:\'Lora\',serif;font-style:italic;">Image will appear here</div>'
        return f"""
<div class="cwm-hero">
  <div>{img_tag}</div>
  <div>
    <div class="meta">{cuisine} · {servings} servings · {time} min</div>
    <h1>{name}</h1>
    <p class="visual">{visual}</p>
  </div>
</div>
"""


# ---------------------------------------------------------------------------
# IngredientChips — wrap-around chips with "have / missing" tinting
# ---------------------------------------------------------------------------
class IngredientChips(TemplatedHTML):
    css_template = """
        .cwm-chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 14px 0; }
        
        /* Forzamos el color del texto y nos aseguramos de que no se herede un color claro */
        .cwm-chips .cwm-chip {
          background: #fbe2d2 !important; 
          color: #6b4a2a !important; 
          border: 1px solid #d8c9ad !important;
          border-radius: 999px; 
          padding: 6px 14px; 
          font-size: 14px;
          font-family: 'Inter', sans-serif;
          display: inline-block;
        }
        
        /* Forzamos el color para los chips de ingredientes faltantes */
        .cwm-chips .cwm-chip.missing { 
          background: #fbe2d2 !important; 
          border-color: #c47a52 !important;
        }
        
        .cwm-chips-empty {
          color: #6b4a2a !important; 
          font-style: italic; 
          padding: 14px 0;
        }
    """

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        have = state.get("have") or []
        missing = state.get("missing") or []
        if not have and not missing:
            return '<div class="cwm-chips-empty">No ingredients yet — upload a fridge photo.</div>'
        parts = ['<div class="cwm-chips">']
        for ing in have:
            parts.append(f'<span class="cwm-chip">{html.escape(str(ing))}</span>')
        for ing in missing:
            parts.append(f'<span class="cwm-chip missing">missing: {html.escape(str(ing))}</span>')
        parts.append('</div>')
        return "".join(parts)


# ---------------------------------------------------------------------------
# DishOptions — three picker buttons (rendered as plain HTML; the actual
# selection is handled by a sibling Gradio Radio for state binding)
# ---------------------------------------------------------------------------
class DishOptions(TemplatedHTML):
    css_template = """
.cwm-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.cwm-options .cwm-option {
  background: #fffbf0 !important; border: 1px solid #d8c9ad; border-radius: 12px;
  padding: 18px; text-align: left;
}
.cwm-options .cwm-option h3 {
  font-family: 'Lora', serif; font-size: 19px; color: #6b4a2a !important;
  margin: 0 0 6px;
}
.cwm-options .cwm-option p { color: #7a5a35 !important; font-size: 14px; line-height: 1.45; margin: 0; }
@media (max-width: 720px) { .cwm-options { grid-template-columns: 1fr; } }
"""

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        opts = state.get("options") or []
        if not opts:
            return ""
        cards = []
        for o in opts[:3]:
            name = html.escape(str(o.get("name", "")))
            why = html.escape(str(o.get("why", "")))
            cards.append(f'<div class="cwm-option"><h3>{name}</h3><p>{why}</p></div>')
        return f'<div class="cwm-options">{"".join(cards)}</div>'


# ---------------------------------------------------------------------------
# StepCard — one card per step (image + instruction + duration + tip)
# ---------------------------------------------------------------------------
class StepCard(TemplatedHTML):
    css_template = """
.cwm-steps { display: flex; flex-direction: column; gap: 16px; }
.cwm-steps .cwm-step {
  display: grid; grid-template-columns: 220px 1fr; gap: 22px;
  background: #fffbf0 !important; border-left: 4px solid #a85c2a; border-radius: 10px;
  padding: 18px 22px;
}
.cwm-steps .cwm-step img {
  width: 220px; height: 160px; object-fit: cover; border-radius: 8px;
  background: #efe3c8;
}
.cwm-steps .cwm-step .placeholder {
  width: 220px; height: 160px; border-radius: 8px;
  background: linear-gradient(135deg,#efe3c8,#dccaa3);
  display:flex; align-items:center; justify-content:center;
  color: #8a6a3a !important; font-family: 'Lora', serif; font-size: 14px;
}
.cwm-steps .cwm-step h3 {
  font-family: 'Lora', serif; color: #6b4a2a !important; margin: 0 0 6px; font-size: 22px;
}
.cwm-steps .cwm-step p { font-size: 16px; line-height: 1.55; color: #4a3722 !important; margin: 0 0 8px; }
.cwm-steps .cwm-step .duration {
  display: inline-block; background: #a85c2a !important; color: #fffbf0 !important;
  border-radius: 999px; padding: 3px 10px; font-size: 12px; letter-spacing: 0.04em;
}
.cwm-steps .cwm-step .tip {
  margin-top: 10px; padding: 10px 12px; background: #fff3d8 !important;
  border-radius: 8px; font-size: 14px; color: #6b4a2a !important;
}
.cwm-step .tip::before { content: "💡 "; }
@media (max-width: 720px) { .cwm-step { grid-template-columns: 1fr; } .cwm-step img, .cwm-step .placeholder { width: 100%; } }
"""

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        steps = state.get("steps") or []
        if not steps:
            return '<div style="color:#b39870;font-style:italic;padding:14px 0;">No steps yet.</div>'
        cards = []
        for s in steps:
            n = s.get("n", 0)
            instr = html.escape(s.get("instruction", ""))
            dur = html.escape(s.get("duration", ""))
            tip = s.get("tip")
            visual = html.escape(s.get("visual", ""))
            img_b64 = s.get("image_b64") or ""
            img_path = s.get("image_path") or ""
            if img_b64:
                img_block = f'<img src="data:image/png;base64,{img_b64}" alt="step {n}"/>'
            elif img_path:
                img_block = f'<img src="/file={html.escape(img_path)}" alt="step {n}"/>'
            else:
                img_block = f'<div class="placeholder">{visual[:80] if visual else f"Step {n}"}</div>'
            tip_block = f'<div class="tip">{html.escape(tip)}</div>' if tip else ""
            cards.append(f"""
<div class="cwm-step">
  {img_block}
  <div>
    <h3>Step {n}</h3>
    <p>{instr}</p>
    <span class="duration">{dur}</span>
    {tip_block}
  </div>
</div>
""")
        return f'<div class="cwm-steps">{"".join(cards)}</div>'


# ---------------------------------------------------------------------------
# NutritionGrid — five macro cells
# ---------------------------------------------------------------------------
class NutritionGrid(TemplatedHTML):
    css_template = """
.cwm-nutri-wrap { margin-top: 10px; }
.cwm-nutri-title {
  font-family: 'Lora', serif; color: #6b4a2a !important; font-size: 22px; margin: 0 0 14px;
}
.cwm-nutri {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px;
}
.cwm-nutri .cwm-nutri-cell {
  background: #fffbf0 !important; border: 1px solid #d8c9ad; border-radius: 10px;
  padding: 14px 10px; text-align: center;
}
.cwm-nutri .cwm-nutri-cell .v {
  font-family: 'Lora', serif; font-size: 24px; font-weight: 700; color: #6b4a2a !important;
  display: block;
}
.cwm-nutri .cwm-nutri-cell .l {
  font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  color: #8a6a3a !important; margin-top: 4px;
}
@media (max-width: 720px) { .cwm-nutri { grid-template-columns: repeat(2, 1fr); } }
"""

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        nutri = state.get("nutrition") or {}
        cells = [
            (nutri.get("calories", 0), "kcal"),
            (nutri.get("protein_g", 0), "protein"),
            (nutri.get("carbs_g", 0), "carbs"),
            (nutri.get("fat_g", 0), "fat"),
            (nutri.get("fiber_g", 0), "fiber"),
        ]
        cell_html = "".join(
            f'<div class="cwm-nutri-cell"><span class="v">{html.escape(str(v))}</span>'
            f'<div class="l">{html.escape(label)}</div></div>'
            for v, label in cells
        )
        return f"""
<div class="cwm-nutri-wrap">
  <h3 class="cwm-nutri-title">Per serving</h3>
  <div class="cwm-nutri">{cell_html}</div>
</div>
"""


# ---------------------------------------------------------------------------
# VerdictBadge — go / wait / fix indicator + tip
# ---------------------------------------------------------------------------
class VerdictBadge(TemplatedHTML):
    css_template = """
.cwm-verdict {
  display: flex; align-items: center; gap: 18px;
  background: #fffbf0 !important; border-radius: 12px; padding: 18px 22px;
  border: 1px solid #d8c9ad;
}
.cwm-verdict.go    { border-left: 6px solid #4f8b4a; }
.cwm-verdict.wait  { border-left: 6px solid #d4a23c; }
.cwm-verdict.fix   { border-left: 6px solid #b94a3a; }
.cwm-verdict-pill {
  font-family: 'Lora', serif; font-weight: 700; font-size: 16px;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 8px 16px; border-radius: 999px; color: #fffbf0;
}
.cwm-verdict.go    .cwm-verdict-pill { background: #4f8b4a; }
.cwm-verdict.wait  .cwm-verdict-pill { background: #d4a23c; }
.cwm-verdict.fix   .cwm-verdict-pill { background: #b94a3a; }
.cwm-verdict-text  { font-size: 16px; color: #4a3722 !important; line-height: 1.5; }
.cwm-verdict-text small { color: #8a6a3a !important; display: block; margin-top: 4px; }
.cwm-verdict-empty {
  color: #b39870; font-style: italic; padding: 14px 0;
}
"""

    @classmethod
    def _render_body(cls, state: dict[str, Any]) -> str:
        v = state.get("verdict")
        if not v:
            return '<div class="cwm-verdict-empty">Upload a progress photo to get a verdict.</div>'
        verdict = state.get("verdict", "wait")
        feedback = html.escape(state.get("feedback", ""))
        tip = state.get("tip")
        tip_html = f"<small>{html.escape(tip)}</small>" if tip else ""
        return f"""
<div class="cwm-verdict {html.escape(verdict)}">
  <div class="cwm-verdict-pill">{html.escape(verdict)}</div>
  <div class="cwm-verdict-text">{feedback}{tip_html}</div>
</div>
"""


# ---------------------------------------------------------------------------
# Convenience helpers — ergonomic state-to-HTML for callbacks
# ---------------------------------------------------------------------------
def recipe_to_state(recipe: dict | object) -> dict:
    """Normalize a Recipe (Pydantic or dict) into the flat dict every
    component reads. Pydantic models are dumped via ``model_dump`` if present."""
    if hasattr(recipe, "model_dump"):
        d = recipe.model_dump()
    elif isinstance(recipe, dict):
        d = recipe
    else:
        d = json.loads(json.dumps(recipe, default=lambda o: o.__dict__))
    return d