"""FlowDeck — Workspace, Comments, Favorites, History, Templates (v2.0.0)."""
from __future__ import annotations

import csv
import io
import json
import logging

from fastapi import APIRouter, Request, HTTPException
from fastapi.responses import HTMLResponse, StreamingResponse

from app.db import get_conn
from app.auth.session import SessionManager

logger = logging.getLogger(__name__)
router = APIRouter(tags=["workspace"], prefix="/workspace")

ROLES = ["admin", "editor", "commenter", "viewer"]


def _current_user(request: Request) -> dict:
    s = request.cookies.get("flowdeck_session", "")
    return SessionManager.decode_session(s) or {"login": "admin", "id": 1}


# ── Workspaces ──

@router.get("")
async def list_workspaces(request: Request):
    with get_conn() as conn:
        rows = conn.execute("SELECT * FROM workspaces ORDER BY name").fetchall()
    return {"workspaces": [dict(r) for r in rows]}


@router.post("")
async def create_workspace(request: Request):
    body = await request.json() if request.headers.get("content-type") else {}
    name = body.get("name", "Default Workspace")
    user = _current_user(request)
    uid = user.get("id", 1)

    with get_conn() as conn:
        uid_ensured = conn.execute("SELECT id FROM users WHERE id=?", (uid,)).fetchone()
        if not uid_ensured:
            conn.execute("INSERT OR IGNORE INTO users (id, login, full_name, is_admin) VALUES (?,?,?,1)",
                         (uid, user.get("login", "admin"), user.get("full_name", "Admin")))
        cur = conn.execute("INSERT INTO workspaces (name, owner_id) VALUES (?,?)", (name, uid))
        ws_id = cur.lastrowid
        conn.execute("INSERT OR IGNORE INTO workspace_members (workspace_id, user_id, role) VALUES (?,?,?)",
                     (ws_id, uid, "admin"))
        conn.commit()
    return {"id": ws_id, "name": name, "status": "created"}


# ── Members ──

@router.get("/{ws_id}/members")
async def list_members(request: Request, ws_id: int):
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT wm.*, u.login, u.full_name, u.avatar_url FROM workspace_members wm JOIN users u ON wm.user_id=u.id WHERE wm.workspace_id=?",
            (ws_id,),
        ).fetchall()
    return {"members": [dict(r) for r in rows]}


@router.post("/{ws_id}/members")
async def add_member(request: Request, ws_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    user_id = body.get("user_id")
    role = body.get("role", "editor")
    if role not in ROLES:
        raise HTTPException(400, f"Invalid role: {role}")
    with get_conn() as conn:
        conn.execute("INSERT OR IGNORE INTO users (id, login, full_name, is_admin) VALUES (?,?,?,1)",
                     (user_id, f"user_{user_id}", f"User {user_id}"))
        conn.execute("INSERT INTO workspace_members (workspace_id, user_id, role) VALUES (?,?,?)",
                     (ws_id, user_id, role))
        conn.commit()
    return {"status": "added"}


@router.put("/{ws_id}/members/{user_id}")
async def update_member_role(request: Request, ws_id: int, user_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    role = body.get("role", "editor")
    if role not in ROLES:
        raise HTTPException(400, f"Invalid role: {role}")
    with get_conn() as conn:
        conn.execute("UPDATE workspace_members SET role=? WHERE workspace_id=? AND user_id=?",
                     (role, ws_id, user_id))
        conn.commit()
    return {"status": "updated"}


@router.delete("/{ws_id}/members/{user_id}")
async def remove_member(request: Request, ws_id: int, user_id: int):
    with get_conn() as conn:
        conn.execute("DELETE FROM workspace_members WHERE workspace_id=? AND user_id=?", (ws_id, user_id))
        conn.commit()
    return {"status": "removed"}


# ── Comments ──

@router.get("/pages/{page_id}/comments")
async def list_comments(request: Request, page_id: int):
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT c.*, u.login, u.avatar_url FROM comments c JOIN users u ON c.user_id=u.id WHERE c.page_id=? ORDER BY c.created_at",
            (page_id,),
        ).fetchall()
    return {"comments": [dict(r) for r in rows]}


@router.post("/pages/{page_id}/comments")
async def add_comment(request: Request, page_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    b = body.get("body", "").strip()
    if not b:
        raise HTTPException(400, "body required")
    user = _current_user(request)
    uid = user.get("id", 1)
    parent_id = body.get("parent_id")
    with get_conn() as conn:
        conn.execute("INSERT OR IGNORE INTO users (id, login, full_name, is_admin) VALUES (?,?,?,1)",
                     (uid, user.get("login", "admin"), user.get("full_name", "Admin")))
        cur = conn.execute("INSERT INTO comments (page_id, user_id, body, parent_id) VALUES (?,?,?,?)",
                           (page_id, uid, b, parent_id))
        conn.commit()
    return {"id": cur.lastrowid, "status": "created"}


@router.put("/comments/{comment_id}")
async def update_comment(request: Request, comment_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    b = body.get("body")
    resolved = body.get("resolved")
    with get_conn() as conn:
        if b is not None:
            conn.execute("UPDATE comments SET body=?, updated_at=CURRENT_TIMESTAMP WHERE id=?", (b, comment_id))
        if resolved is not None:
            conn.execute("UPDATE comments SET resolved=? WHERE id=?", (int(resolved), comment_id))
        conn.commit()
    return {"status": "updated"}


# ── Page History ──

@router.get("/pages/{page_id}/history")
async def page_history(request: Request, page_id: int):
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT * FROM page_history WHERE page_id=? ORDER BY created_at DESC LIMIT 50",
            (page_id,),
        ).fetchall()
    return {"history": [dict(r) for r in rows]}


@router.post("/pages/{page_id}/history")
async def record_history(request: Request, page_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    user = _current_user(request)
    uid = user.get("id", 1)
    with get_conn() as conn:
        conn.execute("INSERT OR IGNORE INTO users (id, login, is_admin) VALUES (?,?,1)", (uid, user.get("login", "admin")))
        conn.execute(
            "INSERT INTO page_history (page_id, user_id, change_type, snapshot_json) VALUES (?,?,?,?)",
            (page_id, uid, body.get("change_type", "updated"), json.dumps(body.get("snapshot", {}))),
        )
        conn.commit()
    return {"status": "recorded"}


# ── Favorites ──

@router.get("/favorites")
async def list_favorites(request: Request):
    user = _current_user(request)
    uid = user.get("id", 1)
    with get_conn() as conn:
        rows = conn.execute(
            """SELECT f.*, cp.title as page_title, c.name as collection_name
               FROM favorites f
               LEFT JOIN collection_pages cp ON f.page_id=cp.id
               LEFT JOIN collections c ON f.collection_id=c.id
               WHERE f.user_id=? ORDER BY f.position""",
            (uid,),
        ).fetchall()
    return {"favorites": [dict(r) for r in rows]}


@router.post("/favorites")
async def add_favorite(request: Request):
    body = await request.json() if request.headers.get("content-type") else {}
    user = _current_user(request)
    uid = user.get("id", 1)
    page_id = body.get("page_id")
    collection_id = body.get("collection_id")
    with get_conn() as conn:
        conn.execute("INSERT OR IGNORE INTO users (id, login, is_admin) VALUES (?,?,1)", (uid, user.get("login", "admin")))
        conn.execute(
            "INSERT OR IGNORE INTO favorites (user_id, page_id, collection_id) VALUES (?,?,?)",
            (uid, page_id, collection_id),
        )
        conn.commit()
    return {"status": "favorited"}


@router.delete("/favorites/{fav_id}")
async def remove_favorite(request: Request, fav_id: int):
    with get_conn() as conn:
        conn.execute("DELETE FROM favorites WHERE id=?", (fav_id,))
        conn.commit()
    return {"status": "removed"}


# ── Templates ──

@router.get("/templates/database")
async def list_db_templates(request: Request):
    with get_conn() as conn:
        rows = conn.execute("SELECT * FROM database_templates ORDER BY name").fetchall()
    return {"templates": [dict(r) for r in rows]}


@router.post("/templates/database")
async def create_db_template(request: Request):
    body = await request.json() if request.headers.get("content-type") else {}
    cur = None
    with get_conn() as conn:
        cur = conn.execute(
            "INSERT INTO database_templates (name, description, schema_json) VALUES (?,?,?)",
            (body.get("name", "Template"), body.get("description", ""), json.dumps(body.get("schema", []))),
        )
        conn.commit()
    return {"id": cur.lastrowid, "status": "created"}


@router.post("/templates/database/{tid}/apply")
async def apply_db_template(request: Request, tid: int):
    body = await request.json() if request.headers.get("content-type") else {}
    name = body.get("name", "New Database")
    with get_conn() as conn:
        tmpl = conn.execute("SELECT * FROM database_templates WHERE id=?", (tid,)).fetchone()
        if not tmpl:
            raise HTTPException(404, "Template not found")
        cur = conn.execute(
            "INSERT INTO collections (name, description, icon, schema_json) VALUES (?,?,?,?)",
            (name, tmpl["description"], "📋", tmpl["schema_json"]),
        )
        conn.execute(
            "INSERT INTO collection_views (collection_id, name, view_type, config_json) VALUES (?,?,?,?)",
            (cur.lastrowid, "Default View", "table", "{}"),
        )
        conn.commit()
    return {"collection_id": cur.lastrowid, "name": name, "status": "created"}


@router.get("/collections/{collection_id}/templates/page")
async def list_page_templates(request: Request, collection_id: int):
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT * FROM page_templates WHERE collection_id=? ORDER BY name", (collection_id,)
        ).fetchall()
    return {"templates": [dict(r) for r in rows]}


@router.post("/collections/{collection_id}/templates/page")
async def create_page_template(request: Request, collection_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    with get_conn() as conn:
        cur = conn.execute(
            "INSERT INTO page_templates (collection_id, name, property_values_json) VALUES (?,?,?)",
            (collection_id, body.get("name", "Default"), json.dumps(body.get("properties", {}))),
        )
        conn.commit()
    return {"id": cur.lastrowid, "status": "created"}


@router.post("/collections/{collection_id}/templates/page/{tid}/apply")
async def apply_page_template(request: Request, collection_id: int, tid: int):
    body = await request.json() if request.headers.get("content-type") else {}
    with get_conn() as conn:
        tmpl = conn.execute("SELECT * FROM page_templates WHERE id=? AND collection_id=?", (tid, collection_id)).fetchone()
        if not tmpl:
            raise HTTPException(404, "Template not found")
        max_pos = conn.execute(
            "SELECT COALESCE(MAX(position), -1) + 1 FROM collection_pages WHERE collection_id=?", (collection_id,)
        ).fetchone()[0]
        cur = conn.execute(
            "INSERT INTO collection_pages (collection_id, title, position, property_values_json) VALUES (?,?,?,?)",
            (collection_id, body.get("title", "New Page"), max_pos, tmpl["property_values_json"]),
        )
        conn.commit()
    return {"id": cur.lastrowid, "status": "created"}


@router.put("/collections/{collection_id}/templates/page/{tid}")
async def update_page_template(request: Request, collection_id: int, tid: int):
    """Update a page template — name, properties, content, recurrence."""
    body = await request.json() if request.headers.get("content-type") else {}
    with get_conn() as conn:
        tmpl = conn.execute(
            "SELECT * FROM page_templates WHERE id=? AND collection_id=?", (tid, collection_id)
        ).fetchone()
        if not tmpl:
            raise HTTPException(404, "Template not found")

        name = body.get("name", tmpl["name"])
        tmpl_dict = dict(tmpl)
        description = body.get("description", tmpl_dict.get("description", ""))
        property_values_json = json.dumps(body.get("properties", json.loads(tmpl["property_values_json"])))
        content_json = json.dumps(body.get("content", json.loads(tmpl_dict.get("content_json", "[]"))))
        is_recurring = int(body.get("is_recurring", tmpl_dict.get("is_recurring", 0)))
        recurrence_rule = body.get("recurrence_rule", tmpl_dict.get("recurrence_rule", ""))

        conn.execute(
            """UPDATE page_templates SET name=?, description=?, property_values_json=?,
               content_json=?, is_recurring=?, recurrence_rule=? WHERE id=?""",
            (name, description, property_values_json, content_json, is_recurring, recurrence_rule, tid),
        )
        conn.commit()
    return {"id": tid, "status": "updated"}


@router.delete("/collections/{collection_id}/templates/page/{tid}")
async def delete_page_template(request: Request, collection_id: int, tid: int):
    """Delete a page template."""
    with get_conn() as conn:
        tmpl = conn.execute(
            "SELECT * FROM page_templates WHERE id=? AND collection_id=?", (tid, collection_id)
        ).fetchone()
        if not tmpl:
            raise HTTPException(404, "Template not found")
        conn.execute("DELETE FROM page_templates WHERE id=?", (tid,))
        conn.commit()
    return {"id": tid, "status": "deleted"}


# ── v4.2.0: Dashboards ──

@router.get("/collections/{collection_id}/dashboards")
async def list_dashboards(request: Request, collection_id: int):
    """List all dashboards for a collection."""
    with get_conn() as conn:
        rows = conn.execute(
            "SELECT * FROM collection_dashboards WHERE collection_id=? ORDER BY name", (collection_id,)
        ).fetchall()
    return {"dashboards": [dict(r) for r in rows]}


@router.post("/collections/{collection_id}/dashboards")
async def create_dashboard(request: Request, collection_id: int):
    """Create a new dashboard for a collection."""
    body = await request.json() if request.headers.get("content-type") else {}
    name = body.get("name", "Dashboard").strip()
    layout = json.dumps(body.get("layout", {"columns": 1, "widgets": []}))

    with get_conn() as conn:
        coll = conn.execute("SELECT id FROM collections WHERE id=?", (collection_id,)).fetchone()
        if not coll:
            raise HTTPException(404, "Collection not found")
        cur = conn.execute(
            "INSERT INTO collection_dashboards (collection_id, name, layout_json) VALUES (?,?,?)",
            (collection_id, name, layout),
        )
        conn.commit()
    return {"id": cur.lastrowid, "name": name, "status": "created"}


@router.put("/collections/{collection_id}/dashboards/{did}")
async def update_dashboard(request: Request, collection_id: int, did: int):
    """Update a dashboard — name or layout (widgets grid)."""
    body = await request.json() if request.headers.get("content-type") else {}
    with get_conn() as conn:
        dash = conn.execute(
            "SELECT * FROM collection_dashboards WHERE id=? AND collection_id=?", (did, collection_id)
        ).fetchone()
        if not dash:
            raise HTTPException(404, "Dashboard not found")

        name = body.get("name", dash["name"])
        layout = json.dumps(body.get("layout", json.loads(dash["layout_json"])))

        conn.execute(
            "UPDATE collection_dashboards SET name=?, layout_json=?, updated_at=CURRENT_TIMESTAMP WHERE id=?",
            (name, layout, did),
        )
        conn.commit()
    return {"id": did, "status": "updated"}


@router.delete("/collections/{collection_id}/dashboards/{did}")
async def delete_dashboard(request: Request, collection_id: int, did: int):
    """Delete a dashboard."""
    with get_conn() as conn:
        dash = conn.execute(
            "SELECT * FROM collection_dashboards WHERE id=? AND collection_id=?", (did, collection_id)
        ).fetchone()
        if not dash:
            raise HTTPException(404, "Dashboard not found")
        conn.execute("DELETE FROM collection_dashboards WHERE id=?", (did,))
        conn.commit()
    return {"id": did, "status": "deleted"}


# ── CSV Import/Export ──

@router.post("/collections/{collection_id}/import/csv")
async def import_csv(request: Request, collection_id: int):
    body = await request.json() if request.headers.get("content-type") else {}
    csv_data = body.get("csv", "")
    if not csv_data:
        raise HTTPException(400, "csv field required")

    reader = csv.DictReader(io.StringIO(csv_data))
    rows_imported = 0
    with get_conn() as conn:
        max_pos = conn.execute(
            "SELECT COALESCE(MAX(position), -1) FROM collection_pages WHERE collection_id=?", (collection_id,)
        ).fetchone()[0]
        for row in reader:
            title = row.get("title", row.get("Title", row.get("Name", "Imported")))
            props = {k: v for k, v in row.items() if k.lower() != "title"}
            max_pos += 1
            conn.execute(
                "INSERT INTO collection_pages (collection_id, title, position, property_values_json) VALUES (?,?,?,?)",
                (collection_id, title, max_pos, json.dumps(props)),
            )
            rows_imported += 1
        conn.commit()
    return {"imported": rows_imported}


@router.get("/collections/{collection_id}/export/csv")
async def export_csv(request: Request, collection_id: int):
    with get_conn() as conn:
        pages = conn.execute(
            "SELECT * FROM collection_pages WHERE collection_id=? ORDER BY position", (collection_id,)
        ).fetchall()

    # Collect all property keys
    all_keys = set()
    rows = []
    for p in pages:
        props = json.loads(p["property_values_json"])
        all_keys.update(props.keys())
        rows.append({"title": p["title"], **props})

    output = io.StringIO()
    fieldnames = ["title"] + sorted(all_keys)
    writer = csv.DictWriter(output, fieldnames=fieldnames)
    writer.writeheader()
    writer.writerows(rows)

    return StreamingResponse(
        iter([output.getvalue()]),
        media_type="text/csv",
        headers={"Content-Disposition": "attachment; filename=export.csv"},
    )


# ── Webhooks Outbound Management ──

@router.get("/webhooks")
async def list_webhooks(request: Request):
    with get_conn() as conn:
        rows = conn.execute("SELECT * FROM webhook_subscriptions ORDER BY created_at DESC").fetchall()
    return {"webhooks": [dict(r) for r in rows]}


@router.post("/webhooks")
async def create_webhook(request: Request):
    body = await request.json() if request.headers.get("content-type") else {}
    url = body.get("url", "").strip()
    event = body.get("event", "page.created")
    secret = body.get("secret", "")
    if not url:
        raise HTTPException(400, "url required")
    with get_conn() as conn:
        cur = conn.execute(
            "INSERT INTO webhook_subscriptions (url, event, secret) VALUES (?,?,?)",
            (url, event, secret),
        )
        conn.commit()
    return {"id": cur.lastrowid, "url": url, "event": event, "status": "registered"}


@router.delete("/webhooks/{wh_id}")
async def delete_webhook(request: Request, wh_id: int):
    with get_conn() as conn:
        conn.execute("DELETE FROM webhook_subscriptions WHERE id=?", (wh_id,))
        conn.commit()
    return {"status": "deleted"}


# ── Public Sharing ──

@router.get("/public/{collection_id}")
async def public_view(request: Request, collection_id: int):
    """Simple public read-only view — no auth required."""
    with get_conn() as conn:
        coll = conn.execute("SELECT * FROM collections WHERE id=?", (collection_id,)).fetchone()
        if not coll:
            raise HTTPException(404, "Collection not found")
        pages = conn.execute(
            "SELECT id, title, icon, property_values_json FROM collection_pages WHERE collection_id=? ORDER BY position",
            (collection_id,),
        ).fetchall()

    items = "".join(
        f"<li>{p['icon']} <b>{p['title']}</b></li>"
        for p in pages
    )
    return HTMLResponse(f"""<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>{coll['name']} — FlowDeck Public</title>
<style>body{{font-family:system-ui;background:#191919;color:#fff;padding:20px}}
h1{{font-size:24px}} li{{padding:8px;border-bottom:1px solid #333}}</style></head>
<body><h1>{coll['icon']} {coll['name']}</h1><ul>{items}</ul><p>{len(pages)} items</p></body></html>""")